The Bihar GazetteThe Bihar GazetteThe Bihar GazetteThe Bihar Gazette EXTRA ORDI PUBLISHED BY AUTHORIT (NO.PATNA 511) PATNA, BIHAR ELECTRICITY REGULATORY COMMISSION No. BERC/Regl-1/2009 Section 181 read with Clause (h) Sub Act, 2003 and all powers enabling it on that behalf, the Bihar Electricity Regulatory Commission hereby specif Bihar Electricity Grid Code 2010 which shall come into force from the date of notification. This Grid Code is applicable for the grids in the State of Bihar only.
1.1 Introduction
(1) The Grid Code lays down the rules followed by all Users of Grid in the State of Bihar to plan, develop, operate and maintain the power system in the State in the most efficient, reliable, economic and secure manner in integration with the Eastern Regional Grid as per the provisions of Indian Electricity Grid Code (IEGC) notified by the Central Electricity Regulatory Commission (CERC) from time to time.
(2) In terms of section 39(1) of the Electricity Act 2003, the State Government is required to notify the B Transmission Utility (STU). State Government has notified the Bihar State Electricity Board (BSEB) as the State Transmission Utility (STU) which is a deemed licensee at present in terms of section 172 of the Electricit
2003.
REGISTERED NO. PT.
The Bihar GazetteThe Bihar GazetteThe Bihar GazetteThe Bihar Gazette XTRA ORDINARY UBLISHED BY AUTHORITY 1 SHRAVANA (S) PATNA, FRIDAY, 23RD JULY 2010 BIHAR ELECTRICITY REGULATORY COMMISSION Bihar Electricity Grid Code NOTIFICATION —————— The 20th July, 2010 1/2009–02–238—In exercise of power conferred under Section 181 read with Clause (h) Sub-section (1) of Section 86 of the Electricity Act, 2003 and all powers enabling it on that behalf, the Bihar Electricity Regulatory Commission hereby specifies the following Grid Code to be known as Bihar Electricity Grid Code 2010 which shall come into force from the date of notification. This Grid Code is applicable for the grids in the State of Bihar only.
The Grid Code lays down the rules, guidelines and standards to be followed by all Users of Grid in the State of Bihar to plan, develop, operate and maintain the power system in the State in the most efficient, reliable, economic and secure manner in integration with the Eastern Regional rid as per the provisions of Indian Electricity Grid Code (IEGC) notified by the Central Electricity Regulatory Commission (CERC) from time to In terms of section 39(1) of the Electricity Act 2003, the State Government is required to notify the Board or a Government Company as State Transmission Utility (STU). State Government has notified the Bihar State Electricity Board (BSEB) as the State Transmission Utility (STU) which is a deemed licensee at present in terms of section 172 of the Electricit REGISTERED NO. PT.-40 The Bihar GazetteThe Bihar GazetteThe Bihar GazetteThe Bihar Gazette In exercise of power conferred under section (1) of Section 86 of the Electricity Act, 2003 and all powers enabling it on that behalf, the Bihar Electricity ies the following Grid Code to be known as Bihar Electricity Grid Code 2010 which shall come into force from the date of notification. This Grid Code is applicable for the grids in the State of Bihar only.
, guidelines and standards to be followed by all Users of Grid in the State of Bihar to plan, develop, operate and maintain the power system in the State in the most efficient, reliable, economic and secure manner in integration with the Eastern Regional rid as per the provisions of Indian Electricity Grid Code (IEGC) notified by the Central Electricity Regulatory Commission (CERC) from time to In terms of section 39(1) of the Electricity Act 2003, the State Government oard or a Government Company as State Transmission Utility (STU). State Government has notified the Bihar State Electricity Board (BSEB) as the State Transmission Utility (STU) which is a deemed licensee at present in terms of section 172 of the Electricity Act, 2 BIHAR GAZETTE (EXTRA) 23RD JULY 2010
(3) As per section 39(2) of the Electricity Act, 2003 the functions of State Transmission Utility are as follows :– a) to undertake transmission of energy through the Intra-State Transmission System b) to discharge all functions of planning and coordination relating to intra-state transmission system with
(i) Central Transmission Utility;
(ii) State Governments;
(iii) Generating Companies;
(iv) Regional Power Committee;
(v) Authority;
(vi) Licensees;
(vii) Any other person notified by the State Government in this behalf c) to ensure development of an efficient, coordinated and economical system of intra-state transmission lines for smooth flow of electricity from a generating station to load centres;
d) to provide non-discriminatory open access to its transmission system for use by –
(i) any licensee or generating company on payment of the transmission charges;
(ii) any consumer as and when such open access is provided by the State Commission under sub section (2) of section 42, on payment of the transmission charges and a surcharge thereon, as may be specified by the State Commission.
(4) STU shall not engage in the business of trading of electricity.
(5) As per the section 31of Electricity Act, 2003, the State Government shall establish a centre to be known as the State Load Despatch Centre (SLDC) and the State Load Despatch Centre shall be operated by a Government company or any authority or corporation established or constituted by or under any State Act, as may be notified by the State Government. Until a Government company or any authority or corporation is notified by the State Government, the State Transmission Utility shall operate the State Load Despatch Centre, which shall:
a) be responsible for optimum scheduling and despatch of electricity within a State, in accordance with the contracts entered into with the licensees or the generating companies operating in that State;
b) monitor the grid operations;
c) keep accounts for the quantity of electricity transmitted through the State grid;
d) exercise supervision and control over the intra state transmission system;
e) be responsible for carrying out real time operations for grid control and despatch of electricity within the State through secure and economic operation of the State grid in accordance with the Grid Standards and the State Grid Code.
(6) The SLDC and licensees shall comply with; the directions of Regional Load Despatch Centre in connection with integrated grid operation of the 3 BIHAR GAZETTE (EXTRA), 23RD JULY 2010 power system or in regard to matter which may affect the operation of the Inter State Transmission System.
(7) SLDC shall not engage in the business of trading of electricity.
1.2 Objective The Grid Code is designed to facilitate the development, operation maintenance and planning of an efficient, coordinated and economical power grid by specifying principles and procedures for STU and all the Users connected to that system. It seeks to be non-discriminatory and ensures that interfaces are not areas of weakness in the supply chain.
1.3 Structure of the Grid Code The Grid Code comprises of following chapters:
I. General Code General Code includes sections on:
(a) Management: intended to ensure that all other sections of the Grid Code work together in the management of the Grid Code
(b) Review Principles: specify a procedure for review of Grid Code to cater to inadvertent omissions and any modifications needed from time to time.
II. Planning Code Planning Code includes sections on:
(a) System Planning: specifies the procedures to be applied by STU in the planning and development of the State Transmission System and by other Users connected or seeking Connection to the State Transmission System.
(b) Principles: specify procedures to be followed by STU in the development of the State Transmission System in the long term taking into account the requirements for new connection of generation and demand.
(c) Connection conditions: specifies the technical requirements and standards to be complied with by STU and other Users connected or seeking connection to the State Transmission System.
III. System Operation Code System Operation Code includes sections on:
(a) System Operation: Specifies the conditions under which STU shall operate the State Transmission System, the Generating Companies shall operate their Power Stations and the Distribution Licensees shall operate their Distribution Systems in so far as necessary to ensure the security and quality of supply and safe operation of the State Transmission System under both normal and abnormal operating conditions.
(b) Outage Planning: Specifies the procedures relating to the co-ordination of outages for scheduled maintenance of the State Transmission System, Generating Units, embedded within the State system and not classified as regional utilities, Captive Power Plant (CPP) and Distribution System that will use the State Transmission System.
4 BIHAR GAZETTE (EXTRA) 23RD JULY 2010 The Generating stations based on non-conventional/renewable energy sources with generating power capacity of above 10 MW will also come under this purview.
IV. Schedule and Despatch Code Schedule and Despatch: —Specifies the procedures relating to the scheduling and despatch of Generating Units and drawal by Distribution Licensees / Open Access Customers to meet state demand and drawal allocation.
V. Protection Code Protection Code specifies the co-ordination responsibility and minimum standards of protection that are required to be installed by Users of the State Transmission System.
VI Metering Code Metering Code specifies the minimum operational and commercial metering to be provided for each User. It also sets out the requirement and procedures for metering.
VII Data Registration Code This contains the details of all the data required by STU, which is to be provided by the Users and vice versa.
1.4 Scope of Grid Code
1. Grid Code defines the boundary between STU and Users and establishes the procedures for operation of facilities connected to the State Grid.
2. All Users that connect with and/or utilize the State Grid are required to abide by the principles and procedures as laid down in the Grid Code in so far as they apply to that User.
3. The Grid Code shall be enforced by STU. Users must provide STU reasonable rights of access, service and facilities necessary to discharge its responsibilities in the users premises and to comply with instructions as issued by STU to implement and enforce the Grid code.
1.5 Non - Compliance
1. If any User fails to comply with any provision of the Grid Code, the User shall inform the SLDC and Grid Code Review Panel without delay the reason for its non-compliance and shall remedy its non-compliance promptly.
2. SLDC shall bring the non-compliance to the notice of BERC.
3. Consistent failure to comply with the Grid Code provisions may lead to disconnection of the User’s plant and /or facilities.
5 BIHAR GAZETTE (EXTRA), 23RD JULY 2010
1.6 Code Responsibilities
1. In discharging its duties under the Grid Code, STU has to rely on information which Users shall supply regarding their requirements and intentions.
2. STU shall not be held responsible for any consequences that arise from its reasonable and prudent actions on the basis of such information.
1.7 Confidentiality
1. Under the terms of the Grid Code, STU will receive information from Users relating to their intentions in respect of their Generation or Supply businesses.
2. STU shall not, other than as required by the Grid Code, disclose such information to any person other than Central or State Government and BERC without the prior written consent of the provider of the information.
1.8 Dispute Settlement Procedures
1. In the event of any dispute regarding interpretation of any part/section of the Grid Code provision between any User and STU, the matter may be referred to the Commission for its decision. The Commission’s decision shall be final and binding.
2. In the event of any conflict between any provision of the Grid Code and any contract or agreement between STU and Users, the provision(s) of the Grid Code will prevail.
1.9 Directive State Government may issue policy directives in certain matters as per section 37 of the Electricity Act 2003. STU shall promptly inform the Commission and all Users of the requirement of such directives.
1.10 Compatibility with Indian Electricity Grid Code This Grid Code is consistent/compatible with the IEGC. However, in matters relating to inter-State transmission, if any provision of the State Electricity Grid Code are inconsistent with the provisions of the IEGC, then the provisions of IEGC as notified by CERC shall prevail.
1.11 The Board functioning as integrated Utility The functions of STU, SLDC, generating stations, Distribution Licensees shall be performed by the concerned officers authorised by the Board as long as it continues to function as an integrated Utility. Till such time the Board is functioning as an integrated utility, Ringfencing of SLDC shall be done separating manpower and accounts for SLDC functions.
1.12 Exemptions Any exemption from the provisions of the Grid Code shall be effective only after the approval of the BERC for which the agencies will have to file a petition in advance.
6 BIHAR GAZETTE (EXTRA) 23RD JULY 2010 Section - 2: Glossary and Definition In the Grid Code the following words and expressions shall, unless the subject matter or context otherwise requires or is inconsistent therewith, bear the following meanings:
ABT Availability Based Tariff Act The Electricity Act, 2003 (Act No. 36 of 2003) Active Energy The electrical energy produced, flowing or supplied by an electric circuit during a time interval, being the integral with respect to time of the instantaneous power, measured in units of watt-hours or standard multiples thereof, Active Power The product of voltage and the in phase component of alternating current measured in units of watts and standard multiples thereof, Apparatus All the electrical apparatus like machines, fittings, accessories and appliances in which electrical conductors are used.
Apparent Power The product of voltage and alternating current measured in unit of volt-amperes and standard multiples thereof, Area of Supply Area within which a Distribution Licensee is authorized by his license to supply electricity.
Automatic Voltage Regulatory (AVR) A continuously acting automatic excitation system to control a Generating Unit terminal voltage.
Authority Central Electricity Authority (CEA) Auxiliaries All the plant and machinery required for the generating unit’s functional operation that do not form part of the generating unit.
Availability Bulk Power Transmission Agreement “Fully Available” shall mean that the Generating Unit is available to its contracted capacity. In respect of the Transmission System, “Availability “ shall mean the time in hours the Transmission System is capable of transmitting electricity at its rated voltage from the supply point to the delivery point and expressed as a percentage of Annual Availability.
Agreements made between the STU and its H.T customers and between the Board and CTU.
Backing Down Reduction of generation on instructions from SLDC / ERLDC by a generating unit under abnormal conditions.
Black start procedure The procedure necessary to recover from partial or total blackout.
Black start capability An ability in respect of a Black Start Station, for at least one of its generating units or CCGT units to start up from shut 7 BIHAR GAZETTE (EXTRA), 23RD JULY 2010 down and to energize a part of the system and be synchronized to the system upon instruction from the State Load Dispatch Centre, within two hours, without any external supply.
Black start stations Generating stations having Black Start Capability.
Captive Power Plant (CPP) A Power Plant set up by any person to generate electricity primarily for his own use and includes a power plant set up by any co-operative society or association of persons for generating electricity primarily for use of members of such co-operative society or association.
CEA Central Electricity Authority Central Transmission Utility (CTU) Any Government Company which the Central Government may notify under sub section (1) of section 38 of the Electricity Act, 2003.
CERC Central Electricity Regulatory Commission.
Connection The electric power lines and electrical equipment used to effect a connection of a user’s system to the Transmission System.
Connection conditions Those conditions mentioned in Section 5 (“connection conditions”) which have to be fulfilled before the User’s System is connected to the State Grid Connection point An electrical point of connection between the Transmission System and the User’s System.
Consumer Any person who is supplied with electricity for his own use by a licensee or the Government or by any other person engaged in the business of supplying electricity to public under the Electricity Act 2003 or any other law for the time being in force and includes any person whose premises are for the time being connected for the purpose of receiving electricity with the works of a licensee, the Government or such other person, as case may be and shall include a person whose electricity supply has been disconnected.
Demand The demand of Active Power in MW and Reactive Power in MVAR of electricity unless otherwise stated.
Demand control Any of the following methods of achieving a load reduction:
(a) Consumer Load Management initiated by Users.
(b) Consumer Load reduction by Disconnection initiated by Users (other than following an instruction from Load Despatch Centre).
(c) Consumer Load reduction instructed by the Load Despatch Centre
(d) Automatic under Frequency Load Disconnection
(e) Emergency manual Load Disconnection Despatch Operation control of an integrated electricity system involving operations such as:
(a) Assignment of levels of output to specific Generating Plant or Load control devices to effect the most reliable and economical supply as the load vary.
8 BIHAR GAZETTE (EXTRA) 23RD JULY 2010
(b) The control of the operation of Extra High Voltage lines, associated sub stations and equipment.
(c) The scheduling of various types of transactions with the electric utilities over the interconnecting Transmission Lines.
De-synchronize The act of taking a generating unit off a system to which it has been synchronized.
Disconnection The physical separation of Users or Consumers from the system.
Discrimination The quality where a relay or protective system is enabled to pick out and cause to be disconnected only the faulty apparatus.
Distribution Licensees A licensee authorized under section 14 of the Act to operate and maintain a distribution system for supplying electricity to the consumers in his area of supply.
Distribution system The system of wires and associated facilities between the delivery points on the transmission lines or the generating station connection and the point of connection to the installation of the consumers.
Drawal The import / export of electrical energy from / to the grid Earthing Connecting the conducting parts of an equipment or machinery with the general mass of earth, in such a manner ensuring at all times an immediate discharge of energy without danger, by maintaining the same efficiently at earth’s potential.
Earthing device A means of providing connection between a conductor and earth being of adequate strength and capability.
EHV Extra High Voltage equal to and greater than 66 kV Frequency The number of alternating current cycles per second (expressed in Hertz) at which the system is operating.
Generating company Any company or body corporate or association or body of individuals, whether incorporated or not, or artificial juridical person, which owns or operates or maintains a generating station.
Generating station Any station for generating electricity, including any building and plant with step-up transformer, switchyard, switch gear, cables or other appurtenant equipment, if any used for that purpose and the site thereof, a site intended to be used for a generating station, and any building used for housing the operating staff of a generating station and where electricity is generated by water – power, includes, penstocks, head and tail works, main and regulatory reservoirs, dams and other hydraulic works, but does not in any case include any sub station.
Generating unit The combination of an electric power generator and its prime mover and all of its associated equipment, which together constitutes a single generating machine.
Generating schedule The despatch schedule of a generating station BERC Bihar Electricity Regulatory Commission 9 BIHAR GAZETTE (EXTRA), 23RD JULY 2010 Grid High Voltage backbone system of inter-connected Transmission Lines, Sub Stations and Generating Stations.
Grid Code “ Bihar Electricity Grid Code”, a document describing the procedures and the responsibilities for planning and operation of Bihar Grid.
Grid Code Review Panel or “Panel” The Panel with the functions set out in the Grid Code.
High Voltage or HV Voltage greater than 440 V and lower than 33 kV.
IEGC Indian Electricity Grid Code, a document describing the philosophy and the responsibilities for planning and operation of Indian Power System specified by the Central Electricity Regulatory Commission (CERC) in accordance with sub section 1 (h) of section 79 of the Act.
Indian Standards (“IS”) Those Standards and specifications approved by the Bureau of Indian Standards.
Inter-State Transmission System (ISTS) Inter-State Transmission System includes :
(a) Any system for the conveyance of electricity by means of a main Transmission Line from the territory of one State to another State;
(b) the conveyance of electricity across the territory of an intervening State as well as conveyance within a State, which is incidental to such inter-state transmission of electricity.
(c) The transmission of electricity within the territory of a State built, owned, operated maintained or controlled by the Central Transmission Utility.
Interconnecting Transformer (ICT) Transformer connecting EHV lines of different voltage systems.
Independent Power Producer (IPP) Power Station within the State owned by a generator who is not part of BSEB.
Intertripping (a) The tripping of circuit – breaker(s) by commands initiated from protection at a remote location independent of the state of local protection; or
(b) Operational intertripping.
Intra–State Transmission System Any system for transmission of electricity other than an Inter - State Transmission System.
Isolation The disconnection of EHV / HV Apparatus from the remainder of the System in which that EHV / HV Apparatus is situated.
Lean Period That period in a day for a few hours when the electrical power demand remains less than the average demand.
Licence Any license granted by BERC under provisions of the relevant laws in force Load The Active, Reactive or Apparent power as the context requires, generated, transmitted or distributed.
10 BIHAR GAZETTE (EXTRA) 23RD JULY 2010 Load Factor Load Factor is the ratio of the average power to the maximum demand. The load factor depends on the interval of time of the maximum demand and the period over which the average is taken.
Load Factor = Units consumed in a given period Maximum demand X No. of hours in the period Low Voltage or LV Voltage not exceeding 440 volts Main protection Protection equipment or system expected to have priority in initiating either a fault clearance or an action to terminate an abnormal condition in a power system.
NTPC National Thermal Power Corporation Limited Operating Margin Aggregate available capacity of generating station in the system on real time basis, which is over and above the operating level to the maximum capacity of the generating units limited by technical parameters for short duration.
Operation A scheduled or planned action relating to the operation of a system.
Operational procedure Management instructions and procedures, both for the safety rules and for the local and remote operation of plant and apparatus, issued in connection with the actual operation of plant and/or apparatus at or from a connecting site.
Open Access The non-discriminatory provision for the use of transmission lines or distribution system or associated facilities with such lines or system by any licensee or consumer or a person engaged in generation in accordance with the regulations specified by the Commission.
Outage A total or partial regulation in availability due to repair and maintenance of the Transmission or Distribution or Generation facility or defect in Auxiliary System.
Part Load The condition of a generating station which is loaded but is not running at its declared availability.
Partial shutdown A shutdown of a part of the system resulting in failure of power supply, either from external connections or from the healthy part of the system.
Peak period That period in a day when the electrical power demand is highest.
Person Any company or body corporate or association or body of individuals, whether incorporated or not, or artificial juridical person.
PGCIL Power Grid Corporation of India Limited Planned outage An outage of generating plant or part of the Transmission system, or part of a User’s System co-ordinated by SLDC.
Power factor The ratio of Active Power (kW) to Apparent Power (KVA) Protection The scheme and Apparatus for detecting abnormal conditions on a system and initiating fault clearance or 11 BIHAR GAZETTE (EXTRA), 23RD JULY 2010 actuating signals or indications.
Rated MW The “rating plate” MW output of a Generating Unit, being that output up to which the generating unit is designed to operate.
Reactive Power The product of voltage and current and the sine of the phase angle between them measured in units of voltamperes reactive and standard multiples thereof;
Regulating Margin The system voltage and frequency beyond which the system should not be operated.
Re- Synchronization The bringing of parts of the system which has gone out of synchronism with each other, back into synchronism.
Safety – Rules The rules framed by the Users and the transmission licensee to ensure safety to persons working on plant / apparatus.
SLDC State Load Despatch Centre Standing Instructions An instruction issued by SLDC to a generating company whereby, in specified circumstances, the generating company should take specified action, as though a valid dispatch instruction has been issued by SLDC.
Start – Up The action of bringing a generating unit from shutdown to synchronous speed.
State Transmission Utility (STU) The utility notified by the Government under sub section (1) of section 39 of the Electricity Act, 2003 and whose functions have been outlined under sub section (2) of section 39 of the Electricity Act 2003.
Station Transformer A transformer supplying electrical power to the auxiliaries of a generating station, which is not directly connected to a generating unit terminal.
Sub station Station for transforming or converting electricity for the transmission or distribution thereof and includes transformers, converters, switchgears, capacitors, synchronous condensers, structures, cable and other appurtenant equipment and any buildings used for that purpose and the site thereof.
Supervisory Control and Data Acquisition or (SCADA) The communication links and data processing systems, which provide information to enable implementation of requisite supervisory and control actions.
Synchronized Those conditions where an incoming generating unit or system is connected to the bus bars of another system so that the frequencies and phase relationships of that generating unit or system as the case may be, and the system to which it is connected are identical.
System Any transmission and distribution system and / or transmission system, as the case may be.
Total system The transmission system and all user systems in Bihar.
Transmission licensee A licensee authorized to establish and operate transmission lines 12 BIHAR GAZETTE (EXTRA) 23RD JULY 2010 Transmission lines All high pressure cables and overhead lines (not being an essential part of the distribution system of a licensee) transmitting electricity from a generating station to another generating station or a sub station, together with any stepup and step-down transformers, switch-gear and other works necessary to and used for the control of such cables or overhead lines, and such buildings or part thereof as may be required to accommodate such transformers, switchgear and other works.
Transmission system The system consisting of high pressure cables and overhead lines of transmission licensee for transmission of electrical power from the generating station upto connection point / interface point with the distribution system. This shall not include any part of the distribution system.
Under Frequency Relay An electrical measuring relay intended to operate when its characteristic quantity reaches the relay settings by decrease in frequency.
User A term utilized in various sections of Grid Code to refer to the persons using the Bihar Grid, as more particularly identified in each section of the Grid Code. In the general conditions the term means any person to whom the Grid Code applies.
Words and expressions used and not defined in this code but defined in the Acts shall have the meanings assigned to them in the said Acts. Expressions used herein but not specifically defined in this Code or in the said Acts but defined under any law passed by a competent legislature and applicable to the electricity industry in the state shall have the meaning assigned to them in such law.
Subject to the above, expressions used herein but not specifically defined in this Code or in the Acts or any law passed by a competent legislature shall have the meaning as is generally assigned in the electricity industry.
13 BIHAR GAZETTE (EXTRA), 23RD JULY 2010 Section –3: Management of Grid Code
3.1 Introduction
1. The State Transmission Utility (STU) is required to implement and comply with the Bihar Electricity Grid Code and to carry out periodic review and amendments of the same with the approval of Bihar Electricity Regulatory Commission (BERC). A Review Panel shall be constituted by STU, as required in this section, comprising of the representatives of the Users of the Transmission System.
2. No change in this Grid Code, however small or large, shall be made without being deliberated and agreed by the Grid Code Review Panel and thereafter approved by BERC. However, in an unusual situation where normal day to day operation is not possible without revision of some clauses of Grid Code, a provisional revision may be implemented before approval of BERC is received, but only after discussion at a special Review Panel Meeting convened on emergency basis. BERC should promptly be intimated about the provisional revision. BERC may issue directions requiring STU to revise the Grid Code accordingly as may be specified in those directions and STU shall promptly comply with any such direction.
3.2 Objective The objective of this section is to define the method of management of Grid Code documents, implementing any changes / modifications required and the responsibilities of the constituents (Users) to effect the change.
3.3 Grid Code Review Panel
1. The Chairperson of the Grid Code Review Panel shall be an Engineer of the STU not below the rank of Chief Engineer. The Member Secretary of the Panel shall also be nominated by STU. The Grid Code Review Panel shall consist of the following members in addition to above on the recommendations of the heads of the respective organizations:
(a) One member from SLDC (head of SLDC)
(b) One Chief Engineer (Generation) of Bihar State Electricity Board.
(c) One member from Transmission licensee in the State other than STU
(d) One representative at senior executive level from system operation from National Thermal Power Corporation Limited (NTPC),
(e) One member at senior level from ERPC Secretariat
(f) One representative at senior executive level from Eastern Regional Load Despatch Centre (ERLDC)
(g) One representative at senior executive level from Distribution Licensee.
(h) One representative at senior executive level from each of the generating companies feeding not less than 50 MW to the Grid in the State.
14 BIHAR GAZETTE (EXTRA) 23RD JULY 2010
(i) One representative from all Captive Power Plants (CPPs), which are in parallel operation with Bihar State Grid, on rotation basis.
(j) One representative from all the generating companies of small generating stations of less than 50 MW capacity on rotation basis.
2. Any other member can be co-opted as a member of the panel when directed by BERC.
3. The functioning of the Committee shall be co-ordinated by STU. The Member Secretary nominated by STU shall be the convener.
4. STU shall inform all the Users, the names and addresses of the Review Panel, Chairperson and the Member Secretary at least 15 days before the first Review Panel meeting. Any subsequent changes shall also be informed to all the Users by STU. Similarly, each user shall inform the names and designations of their representatives to the Member secretary of the Review Panel, at least three days before the first Review Panel meeting, and shall also inform the Member Secretary in writing regarding any subsequent changes.
3.4 Functions of the Review Panel The functions of the Review Panel are as follows:
(a) Review and Maintenance of the Grid Code and its working.
(b) Consideration of all requests for review made by any user and make recommendations for changes in the Grid Code together with reasons for such changes.
(c) Provide guidance on interpretation and implementation of the Grid Code.
(d) Examination of the problems raised by any user as well as resolution of the problems.
(e) Ensuring that the changes / modifications proposed in the Grid Code are consistent and compatible with Indian Electricity Grid Code (IEGC).
The Review Panel may hold any number of meetings as required subject to the condition that at least one meeting shall be held in every three months. Sub-meetings may be held by STU with the Users to discuss individual requirements and with groups of Users to prepare proposals for Co-ordination Committee’s consideration.
3.5 Review and Revisions
1. The Users seeking any amendment to the Grid Code shall send written requests to the Member Secretary of the Review Panel. If the request is sent to BERC directly, the same shall be forwarded to STU. STU shall examine the proposed changes / modifications in line with IEGC stipulations and circulate the same along with its comments to all Review Panel members for their written comments within a reasonable time frame. Whenever it is observed that a certain clause of Grid Code is not consistent with the IEGC, then the same will be discussed in the Review Panel and the clause will be revised to make it consistent with IEGC.
2. All the comments received shall be scrutinized and compiled by STU.
These along with STU’s comments shall be sent to all the members for 15 BIHAR GAZETTE (EXTRA), 23RD JULY 2010 their response for the proposed change / modification. If necessary, STU shall convene a meeting of the Review Panel for deliberations.
The Member Secretary shall present all the proposed revisions of the Grid Code to the Review Panel for its consideration.
3. Based on the response received, STU shall finalise its recommendation regarding the proposed modification / amendment and submit the same along with all the related correspondence to BERC for approval.
4. STU shall send the following reports to the BERC at the conclusion of each review meeting of the Committee:
(a) Report on the outcome of such review.
(b) Any proposed revision to the Grid Code.
(c) All written representations and objections submitted by the Users at the time of review.
5. All revisions to the Grid Code require the approval of BERC. STU shall publish revisions to the Grid Code, after the approval of BERC. STU may submit proposals for relaxation in such cases where Users have difficulties in meeting the requirements of the Grid Code.
6. Any change from the previous version shall be clearly marked in the margin. In addition, a revision sheet shall be placed at the front of the revised version noting the number of every changed sub section, together with reasons for such change.
7. STU shall maintain copies of the Grid Code with the latest amendments and shall make it available at a reasonable cost to any person requiring it. This may also be made available on the website.
The STU shall keep an up to date list of recipients of all the copies of the Grid Code, if found necessary to ensure that the latest version of Grid Code is reached to all the relevant recipients.
8. The Commission, may, on the application of the Users or otherwise, call the emergency meeting of the Review Panel as and when the situation so dictates and make such alterations or amendments in the Grid Code as it thinks fit.
16 BIHAR GAZETTE (EXTRA) 23RD JULY 2010
CHAPTER– 2: PLANNING CODE Section –4: System Planning
4.1 Introduction
1. This section specifies the methods for data submission by Users to STU for planning and development of the State Transmission System.
This section also specifies the procedures to be adopted by STU in the planning and development of the State Transmission System.
2. Requirement for reinforcement or extension of the State Transmission system arise due to many reasons of which a few are mentioned below:
i) Development on a User’s system already connected to the State Transmission System.
ii) Introduction of a new connection point between the User’s system and the State Transmission System.
iii) Evacuation system for generating stations within or outside State iv) Reactive compensation.
v) A general increase in system capacity due to addition of generation or system load.
vi) Transient or steady state stability considerations vii) Cumulative effect of any of the above
3. The reinforcement or extension of the State Transmission System may involve work at an entry or exit point (connection point) of a User to the State Transmission System. Since development of all User’s systems must be planned well in advance to ensure consents and way leaves to be obtained and detailed engineering design / construction work to be completed, STU will require information from Users and vice versa.
To this effect, the planning code imposes time scale for exchange of necessary information between STU and Users.
4.2 Objective This section formulates the procedures for the ‘System Planning’ to enable STU in consultation with the Users, to evolve an efficient, coordinated, secure and economical State Transmission System to satisfy requirements of future demand.
4.3 Planning Policy
1. STU would develop a perspective transmission plan for next 10 years for the State Transmission System. These plans shall be updated every year to take care of the revisions in load projections and generation capacity additions. The perspective plans shall be submitted to the Commission for approval.
2. STU shall carryout network studies and review fault levels for planning system strengthening and augmentation.
3. STU shall follow the following steps in planning:
i) Forecast the demand for power within the area of supply based on the forecasts provided by Distribution Licensees. These shall 17 BIHAR GAZETTE (EXTRA), 23RD JULY 2010 include details of demand forecasts, data methodology and assumptions on which forecasts are based. These forecasts would be annually reviewed and updated, and also whenever major changes are made in the existing system.
ii) Prepare a proposal for the requirement of generation for the state to meet the load demand as per the forecast taking into account the existing contracted generation resources.
iii) Prepare a transmission plan for the State Transmission System compatible with the above load forecast and generation plan. VAR compensation needed will also be included.
iv) Necessary load flow studies shall be carried out for short circuit and transient stability study and relay coordination study for transmission system planning.
v) STU shall be responsible to prepare and submit a long term (10 years) plan to BERC for generation expansion and transmission system expansion to fully meet both energy and peak demand.
vi) STU shall extend support to Central Transmission Utility (CTU) to finalise the annual planning. corresponding to a 5 years forward term for identification of major inter-state transmission system including inter - regional schemes which shall fit in with the long term plan developed by CEA.
4. All Users shall supply to STU, the planning data prescribed in Appendix A and Appendix B of Data Registration Code within 3 months from the effective date of the Grid Code and thereafter such data shall be furnished by 31st March every year to enable STU to formulate/ finalise the updated plan by 30th September each year for the next 5 years.
4.4 Planning Criterion
1. The planning criterion shall be based on the security philosophy on which both Inter State Transmission System (ISTS) and the State Transmission System (STS) have been planned. The security philosophy shall be as per the Transmission Planning criteria and guidelines as given by Central Electricity Authority (CEA).
2. The State Transmission System planning and generation expansion planning shall be in accordance with the provisions of the planning criterion as per IEGC Clause 3.5.
4.5 Planning responsibility
1. The primary responsibility of load forecasting within distribution licensee’s area of supply rests with the respective Distribution Licensee. The Distribution Licensee shall determine peak load and energy forecast of their areas for each category of loads for each of the succeeding 5 years and submit the same annually by 31st March to STU along with details of demand forecasts, data, methodology and assumptions on which forecasts are based along with their proposals for transmission system augmentation. The load forecasts shall be made for each of the prevalent as well as proposed inter connection points between STU and Distribution Licensees and shall include annual peak load and energy projections.
18 BIHAR GAZETTE (EXTRA) 23RD JULY 2010
2. Generating stations shall provide their generation capacity to STU for evacuating power from their power stations for each of the succeeding 5 years along with their proposals for augmentation of transmission proposals and submit the same annually by 31st March to STU.
3. The planning for strengthening the State Transmission System for evacuation of power from outside state stations shall be initiated by STU.
4.6 Planning data
1. To enable STU to conduct system studies and prepare perspective plans for electricity demand, generation and transmission, the Users shall furnish data to STU from time to time as detailed under Data Registration section as under:
(a) Standard Planning Data (Generation) / Standard Planning Data (Distribution) as per Appendix A.
(b) Detailed Planning Data (Generation) / Detailed Planning Data (Distribution) as per Appendix B.
2. To enable the Users to co-ordinate planning design and operation of their plants and systems with the State Transmission System, they may seek certain data of transmission system as applicable to them, which the STU shall supply from time to time as detailed under Data Registration Section categorized as;
(a) Standard Planning Data (Transmission) as per Appendix A.
(b) Detailed Planning Data (Transmission) as per Appendix B.
4.7 Implementation The actual programme of implementation of transmission lines, inter – connecting transformers, reactors/capacitors and other transmission elements will be determined by STU in consultation with the concerned Users. The completion of these works in the required time frame shall be ensured by STU through the concerned users. STU/SLDC may periodically inform RLDC of their plans as well as stages of implementation.
19 BIHAR GAZETTE (EXTRA), 23RD JULY 2010 Section – 5: Connection Conditions
5.1 Introduction This section specifies the technical, design and operational criteria which shall be complied with by every User connected or seeking connection to the State Transmission System.
Any user seeking connection to or connected with the intra-state system shall comply with the CEA Regulations 2007 “Technical Standards for connectivity to the Grid”.
This applies to all users seeking connection or connected to the intra-state system.
5.2 Objective The objective of this section is to ensure the following:
i) All Users or prospective Users are treated in a non-discriminatory manner ii) Any new or modified connection when established shall neither suffer unacceptable effects due to its connection to State Transmission System nor impose any unacceptable effect on the system of existing Users and new connection shall not suffer adversely due to existing Users.
iii) A system of acceptable quality is ensured by specifying the required minimum standards for the design and operational criteria to assist the Users in their requirement to comply with the licence obligations.
iv) The ownership and responsibility for all equipments is clearly specified in the “Site Responsibility Schedule” for every site, where a connection is made.
5.3 Procedure for application for connection to Transmission System The procedure for any new connection or modification of an existing connection with the State Transmission System shall consist of following:
1. The User shall meet all necessary conditions as specified in the State Grid Code and submit the application to STU containing all the information as may be specified.
2. STU shall make a formal offer within 60 days of the receipt of the application. The offer shall specify and take into account any work required for the extension or reinforcement of the State Transmission System necessitated by the applicant’s proposal and for obtaining any consent necessary for the purpose. STU shall process the application in accordance with the CEA regulations on Grid Connectivity
3. If the specified time limit for making the offer against any application is not adequate, STU shall make a preliminary offer within the specified time indicating the extent of further time required for detailed analysis.
4. Any offer made by STU shall remain valid for a period of 60 days and unless accepted before the expiry of such period, shall lapse thereafter.
5. In the event of offer becoming invalid or not accepted by the applicant, STU shall not be bound to consider any further application from the same applicant within 12 months unless the new application is substantially different from the original application.
6. The applicant shall furnish the Detailed Planning Data as per Appendix-B.
20 BIHAR GAZETTE (EXTRA) 23RD JULY 2010
5.4 Rejection of application STU shall be entitled to reject any application for connection to or use of the State Transmission System due to the following reasons apart from others as considered reasonable:
(i) If such proposed connection is likely to cause breach of any provision of its Licence or any provision of the Grid Code or any provision of IEGC or any criteria or covenants or deeds or regulations by which STU is bound.
(ii) If the applicant does not undertake to be bound, in so far as applicable, by the terms of the Grid Code.
(iii) If the applicant fails to give confirmation and undertakings according to this section.
(iv) The reason for rejection of connection to or use of the state transmission system will be communicated to the applicant by STU within 60 days of the receipt of application.
5.5 Connection Agreement
1. A connection agreement, or the offer for a connection agreement shall include (but not limited) within its terms and conditions the following:
(i) A condition requiring both agencies to comply with the Grid Code.
(ii) Details of connection technical requirements and commercial arrangements
(iii) Details of any capital related payments arising from necessary reinforcement or extension of the system, data communication, RTU etc and demarcation of the same between the concerned parties.
(iv) A Site Responsibility Schedule (Appendix-D).
(v) General Philosophy, Guidelines etc on protection and telemetry
2. Model Connection agreement :- This shall be prepared by STU and submitted to the Commission for approval.
5.6 Site responsibility schedule
1. For every connection to the State Transmission System for which a connection agreement is required, STU shall prepare a schedule of equipment with information supplied by the respective Users. This schedule, called ‘Site Responsibility Schedule’ shall indicate the following for each item of equipment installed at the connection site.
i) Ownership of the equipment ii) Responsibility for control of equipment iii) Responsibility for maintenance of equipment iv) Responsibility for operation of equipment v) Responsibility for all matters relating to safety of persons and site.
vi) Management of the site.
2. The format to be used in the preparation of Site Responsibility Schedule is given in Appendix – D.
5.7 System Performance
1. All equipment connected to the State Transmission System shall be of such design and construction that enable STU to meet the requirement of standards of performance specified by BERC under section 57 of the Electricity Act, 2003.
21 BIHAR GAZETTE (EXTRA), 23RD JULY 2010
2. Installation of all electrical equipment shall comply with IE Rules, 1956 which are in force for time being and will be replaced by new rules made under Electricity Act, 2003.
3. For every new / modified connection sought the STU shall specify the connection point, technical requirements and the voltage to be used, along with metering, telemetering and protection requirements as specified in the Metering Code and Protection Code.
4. Insulation coordination of the User’s equipment shall conform to the applicable values as specified by STU from time to time out of those applicable as per Indian Standards / Code of Practices. Rupturing capacity of the switch gear shall not be less than that specified by STU from time to time.
5. Protection schemes and metering schemes shall be as detailed in the Protection Code and Metering Code.
6. The State Transmission System rated frequency shall be 50.00 Hz and shall be regulated by the provisions of IEGC as given below:
Target Range Upper limit – 50.20 Hz Lower limit – 49.50 Hz
7. The Users shall be subject to the Grid discipline prescribed by SLDC and ERLDC.
8. The variation of voltage at the interconnected point should not be more than voltage range specified below:
Nominal (KV) % limit of variation Maximum (KV) Minimum (KV) 400 +5% / - 5% 420 380 220 +/- 10% 245 198 132 +/- 10% 145 122
5.8 Connection Points / Interface points
1. State Generating Stations (SGS)
(i) Voltage may be 220/132/33 KV or as agreed with STU.
(ii) Unless specifically agreed with STU, the Connection point with generating station shall be the terminal isolator provided just before the outgoing gantry of the feeders.
(iii) SGS shall operate and maintain all terminals, communication and protection equipments provided within the generating station.
(iv) The provisions for the metering between generating station and STU system shall be as per the Metering Code.
(v) Respective Users shall maintain their equipments from the out going feeders’ gantry onwards emanating from generating station
(vi) All entities embedded within BSEB system and interfacing the intra/state transmission system shall provide adequate and reliable communication facility so that SLDC is able to record in its SCADA system the MW/ MVAR flows, bus voltages at all the interface points with the intra-state system.
22 BIHAR GAZETTE (EXTRA) 23RD JULY 2010
2. Distribution Licensee
(i) Voltage may be LV side of power transformer i.e. 33 KV or 11 KV or as agreed with STU. For EHV consumers directly connected to transmission system, voltage may be 220 KV/ 132 KV
(ii) Unless specifically agreed with Distribution Licensee, the Connection point with STU shall be the terminal isolator provided just before the outgoing gantry of the feeder to Distribution Licensee or individual EHV consumer as the case may be, from STU sub-station
(iii) STU shall operate and maintain all terminals, communication and protection equipments provided within its sub-station. The provisions for the metering between STU and Distribution Licensee systems shall be as per the Metering Code. Respective Users shall maintain their equipment beyond the out going gantry of feeders emanating from STU sub-station onwards.
3. Eastern Regional Transmission System The Connection, protection scheme, metering scheme and the voltage shall be in accordance with the provisions of IEGC.
4. Independent Power Producers (IPPs), Captive Power Plants (CPPs), Extra High Voltage (EHV) Consumers and Open Access Customers
(i) Voltage may be 220/132/33 KV or as agreed with STU.
(ii) When IPPs, CPPs, EHV Consumers or the Open Access Customers own sub-stations, the Connection point shall be the terminal isolator provided just before the gantry of outgoing/incoming feeder in their premises.
23 BIHAR GAZETTE (EXTRA), 23RD JULY 2010
CHAPTER – 3: SYSTEM OPERATION CODE Section – 6: Operation Planning
6.1 Introduction This section describes the process by which the SLDC carries out the operational planning and demand control procedures to permit reduction in demand for any reason.
6.2 Objective Operational Planning is aimed at integrated, economic and reliable operation of the State grid.
Operating Policy:
i) Overall real time operation of the State grid shall be supervised by the SLDC and the STU in accordance with Grid Code.
ii) Distribution Licensee shall monitor grid operation of its distribution system and coordinate with the SLDC.
iii) All State entities shall comply with the operation guidelines specified hereinafter and co-ordinate with each other, for deriving maximum benefits from the integrated operation and for equitable sharing of obligations.
iv) A set of detailed internal operating procedures for the State Grid shall be developed and maintained by the SLDC in consideration with the entities and same shall be consistent with Grid Code.
The control rooms of the SLDC, Area LDC, generating stations, and EHV sub-stations and any other control centers of all the entities shall be manned round the clock by qualified personnel with adequate training.
6.3 System security
1. All Users shall operate their respective power system and generating stations in synchronization with each other at all times so that the whole State Transmission System operates as a synchronized system as well as integrated part of Eastern Region Gird. STU shall operate the inter - state links so that inter state transfer of power can be achieved smoothly when required.
2. No part of the State Transmission System shall be isolated from the integrated grid except under the following conditions;
i) Emergency situations that may result in total grid collapse.
ii) Isolation of the system to prevent serious damage to important/costly equipment.
iii) When such isolation is specifically instructed by SLDC.
iv) On operation of under frequency / islanding scheme as approved at Eastern Region level.
3. Complete synchronization shall be restored as soon as conditions permit. The restoration process shall be supervised by SLDC.
4. The 132 KV and above transmission lines (except radial lines which do not affect the operation of the Grid) and the inter connecting power transformers should not be opened or removed from service without instruction or prior clearance from the SLDC. Under emergencies where prior clearance from SLDC is not possible, it should be intimated 24 BIHAR GAZETTE (EXTRA) 23RD JULY 2010 to SLDC at the earliest possible time after the incident and get the clearance, while bringing back these lines into service.
5. Any tripping, whether manual or automatic of transmission lines by 132 KV and above or power transformers of 132 KV class and above and 50 MVA and above shall be promptly reported to the SLDC at the earliest along with the reasons for such tripping and the likely time required for restoration. The information / data including that down loaded from disturbance recorder, sequential event recorder etc.
required for the purpose of analysis shall be sent to SLDC.
For restoration of tripped equipment / line, SLDC shall be informed and get its clearance.
6. All generating units of 200 MW and above in case of thermal and 10 MW and above in case of hydro which are synchronized with the grid irrespective of their ownership shall have their governors in normal operation at all times. If any generating unit of over 50 MW size is required to be operated without its governor in normal operation, the ERLDC through SLDC shall be immediately intimated about the reason and duration of such operation. The exemption from free governor mode operation in respect of run of river hydro stations without any pondage, steam turbine of thermal and gas based power stations not having free governor mode facility shall be obtained from CERC under clause 1.6 of IEGC.
7. Facilities available with / in Load limiter, Automatic Turbine Run-up System (ATRS), Turbine Supervisory Coordinated Control System etc., shall not be used to by pass the normal governor action in any manner.
No dead bands and time delays shall be deliberately introduced.
8. All generating units operating in Free Governor Mode Operation (FGMO) at or upto 100% of their maximum continuous rating shall normally be capable of (and shall not be prevented from) picking up 5% extra load, more than the declared maximum continuous rating, for atleast five minutes or within the technical limits specified by the manufacturers, when the frequency falls due to a system contingency.
In case any generating unit of 50 MW and above size does not meet this requirement for any period, the generating company should intimate the same to SLDC along with reasons thereof. Any generating unit not capable of complying with above provisions either due to not having requisite facilities or otherwise shall seek exemption from Central Electricity Regulatory Commission (CERC) under clause 1.6 of IEGC.
9. In case frequency falls below 49.5 Hz, all partly loaded Generating Units shall pick up additional load at a faster rate, according to their capability. SLDC in consultation with ERLDC and Distribution Licensees shall prepare a plan for automatic load relief during the low frequency conditions. In case frequency rises to 50.5 Hz or higher, neither any generating unit shall be synchronized with the Grid nor shall generation at any generating station (irrespective of type or ownership) be increased without obtaining approval from SLDC.
10. Except under an emergency, or to prevent an imminent damage to costly equipment, no User shall suddenly decrease/increase its 25 BIHAR GAZETTE (EXTRA), 23RD JULY 2010 generation without prior intimation to the SLDC. Similarly, no User shall cause a sudden decrease/increase in its load due to imposition/lifting of power cuts etc., without prior intimation to and consent of SLDC, particularly when frequency is deteriorating.
11. All Generating Units shall normally have their Automatic Voltage Regulators (AVRs) in operation, with appropriate settings. In particular, if a Generating Unit of over 50 MW capacity is required to be operated without its AVR in service, the same should be operated only after prior concurrence of SLDC.
12. Each Generating Unit must be fitted with a turbine speed governor having an overall droop characteristic within the range of 3% to 6%, which shall always be in service.
13. State Generating Stations and other generating stations connected to the Grid shall follow the instructions of SLDC for backing down/boxing up (ramping-down) and shutting down the generating unit(s). SLDC shall provide the certificate for the period of the backing down/boxing up or shutting down for the purpose of computing the deemed generation, if required.
14. Various steps shall be taken for frequency management and voltage management so as to ensure system security from these considerations.
6.4 Demand Estimation
1. The Distribution Licensee shall formulate a short–term demand forecast considering the previous financial year as base and projecting the demand for the succeeding 5 years.
2. It shall be the responsibility of all Distribution Licensees to fully cooperate with STU in preparation of demand forecast for the entire state.
3. The long term demand estimation / load forecast (for more than 1 year) shall be done by STU and SLDC shall be provided with a copy of the same as and when it is finalized.
SLDC shall inform its load projections (both peak and off – peak) in ERPC forum for three months, to be reviewed every month ahead.
4. The Distribution Licensees shall provide to the STU and SLDC their estimates of demand for each inter connection point for the next financial year by 31st January of each year Distribution Licensees shall also provide daily demand for the month ahead at each inter connection point by 25th of the month.
5. Based on the data furnished by the Distribution Licensees, STU shall make monthly peak and lean period demand estimates for year ahead and daily peak and lean period demand estimates for the month ahead and furnish the same to SLDC.
6. The Distribution Licensee shall provide to SLDC on day ahead basis, at 9.00 hrs, each day their estimated demand for each 15 minute block for the ensuing day. The Distribution Licensee shall also provide to SLDC estimates of loads that may be shed, when required, in discreet blocks with details of arrangement of such load shedding.
26 BIHAR GAZETTE (EXTRA) 23RD JULY 2010
7. The SLDC would update demand forecast (in MW as well as kWh) on quarterly, monthly, weekly and ultimately on daily basis which would be used in the day – ahead scheduling.
6.5 Demand Control
1. Automatic load shedding shall be resorted to by means of installation of the Under Frequency Relays at the sub stations of the STU as per the directions of the SLDC to preserve the overall integrity of the power system. The number and size of the discrete blocks using Automatic Under Frequency Relays for Load Shedding shall be determined on rotational basis in consultation with every Distribution Licensee. The frequency settings of these relays shall be coordinated in consultation with the RLDC.
2. Whenever restoration of large portions of the total demand disconnection effected by the automatic load shedding is not possible within a reasonable time, the SLDC shall implement additional disconnection manually, to restore an equivalent amount of demand disconnected automatically.
Each Distribution Licensee shall help the SLDC in identifying such load blocks.
Load shed by the operation of automatic load shedding devices shall not be restored without specific directions from the SLDC.
3. Planned manual disconnections shall be implemented by the SLDC when there is a shortfall in generation, or constraints in Transmission System, or reduction of imports through external connection etc., requiring demand control to control the over-drawl of power from Inter State Generating State (ISGS) when the system frequency falls below
49.5 Hz. In such cases a rotational load shedding scheme shall be adopted to ensure equitable treatment for all consumers as far as practicable.
4. Emergency Manual Disconnection to deal with unacceptable voltage and frequency levels etc. shall be implemented by the SLDC when loss of generation, mismatch of generation with the demand, constraints in the transmission system, over-drawal from the grid in excess of respective schedule affecting the frequency of the regional grid below 49 Hz, requiring load shedding at short notice or no notice, to maintain a regulating margin.
5. These control measures shall not be withdrawn till the system frequency improves and when the SLDC issues such instructions after review of the situation.
6.6 Load Crash
1. In the event of load crash in the system due to weather disturbance or any other reasons, the situation would be controlled by SLDC by the following methods in descending priorities:
i. Lifting of the load restrictions, if any ii. Exporting the power to neighbouring regions/ states provided the same does not endanger the security of the ISTS iii. Backing down of thermal stations with a time lag of 5-10 minutes for short period in merit order.
27 BIHAR GAZETTE (EXTRA), 23RD JULY 2010 iv. Closing down of hydel units (subject to non spilling of water and effect on irrigation) keeping in view the inflow of water into canals and safety of canals/hydel channels.
2. While implementing the above, the system security aspects should not be violated as per provisions in section 5.2 of IEGC and Section 6.3 of the Grid Code.
Section-7: Outage Planning
7.1 Introduction This section describes the procedure for preparation of outage schedules for the elements of the State Grid in a coordinated and optimal manner keeping in view the State Grid operating conditions and the balance of generation and load.
7.2 Objective The objective of this section is to define the process which will allow STU to optimise transmission outages with SGS (other than CPP) and Distribution Licensees, Outages in co-ordination with outage planning of regional system while maintaining system security to the extent possible.
7.3 Outage Planning Process
1. Each User shall provide their outage programme for ensuing financial year to SLDC for preparing an overall outage plan for the State Transmission System as a whole. SLDC shall be responsible for analyzing the outage schedules of all Users including SGS, Distribution Licensees, STU and Transmission Licensee(s) schedules for outage of Transmission network and preparing a draft annual Outage Plan for the State Transmission System in coordination with the Outage Plan prepared for the region by ERLDC. The Users shall furnish the information to SLDC as per Appendix-C.
2. SLDC is however authorised to defer the outage in case of any of the following events:
• Major grid disturbance • System Isolation • Black out in the State • Any other event in the system that may have an adverse impact on system security by the proposed outage
3. Each User shall obtain approval of SLDC, prior to availing the Outage.
SLDC while permitting any circuit for outage shall issue specific code.
Similarly, no inter user boundary circuits shall be connected back to the State Transmission System without specific code/approval by SLDC.
This restriction shall however not be applicable to individual Generating Unit(s) of a CPP.
7.4 Annual Outage Planning
1. Scheduled outage of power stations of capacity 25 MW and above as notified by SLDC from time to time, will be subject to annual planning.
2. Scheduled outage of power station of 50 MW and above and EHV lines as notified by ERLDC, will also be subject to annual planning of ERPC Secretariat in co-ordination with SLDC.
28 BIHAR GAZETTE (EXTRA) 23RD JULY 2010
3. SGS (except CPPs) connected to the State Grid shall furnish their proposed Outage programme for the next financial year in writing by 15th November each year.
4. SGS Outage programme shall contain details like identification of unit, reason for outage, generation availability affected due to such outage, outage start date and duration of outage. SLDC shall review the outage programme received from SGS on monthly basis to chalk out the outage of the State Transmission System.
5. SLDC shall also obtain from STU, the proposed outage programme for Transmission lines, equipments and sub-stations etc. for next financial year by 15th November each year. STU outage programme shall contain identification of lines/ substations, reasons for outage, outage start date and duration of outage.
6. Scheduled outage of power stations and EHV transmission lines affecting regional power system shall be affected only with the approval of ERPC in co-ordination with SLDC.
7. Scheduled outage of power stations of capacity 25 MW and above, of all EHV lines and HV lines forming interconnection between two EHV substations (and these notified as such by SLDC) shall be approved by SLDC, 24 hours in advance based on prevalent operating conditions.
8. In respect of scheduled outage referred in this section a calendar shall be formulated in respect of annual outage planning for the ensuing financial year. Such outage plan shall be deliberated and finalised in the meeting of the Operation and Co-ordination Committee (OCC). to be constituted by SLDC at the State level.
a. SLDC shall submit the proposed annual outage plan of the next financial year to ERPC Secretariat by 30th November of preceding year.
b. Final annual outage plan shall be communicated to ERPC Secretariat by 15th January of each year.
7.5 Availing of shutdowns schedule SLDC would review on daily basis the outage schedule for the next two days and in case of any contingency or conditions described in section
5.7.4(g) of the IEGC, defer any planned outage as deemed fit clearly stating the reasons thereof. The revised dates in such cases would be finalized in consultation with the User.
29 BIHAR GAZETTE (EXTRA), 23RD JULY 2010 Section-8: Contingency Planning
8.1 Introduction This section describes the steps in the recovery process to be followed by all Users in the event of total or partial blackouts of the State Transmission System or Regional System.
8.2 Objective The objective of this section is to define the responsibilities of all Users to achieve the fastest recovery in the event of the State Transmission System or Regional System blackout, taking into account essential loads, generator capabilities and system constraints.
8.3 Contingency Planning Procedure
1. SLDC shall be prepared to efficiently handle the following types of contingencies and restoration of system back to normal:
• Partial system black out in the state due to multiple tripping of the Transmission lines emanating from power stations/sub-stations • Total black out in the state/region • Synchronisation of system islands and system split
2. In case of partial black out in the system/state, priority is to be given for early restoration of power station units, which have tripped. Start up power for the power station shall be extended through shortest possible route and within shortest possible time from adjoining substation/power station where the supply is available. Synchronising facility at all power stations and 220 kV sub-station having interconnection with ISTS shall be available.
3. In case of total regional black out, SLDC In-charge shall co-ordinate and follow the instructions of ERLDC for early restoration of the entire grid. Startup power to the thermal stations shall be given by the hydel stations or through interstate supply, if available. All possible efforts shall be made to extend the hydel supply to the thermal power stations through shortest transmission network so as to avoid high voltage problem due to low load conditions. For safe and fast restoration of supply, SLDC shall formulate the proper sequence of operation for major generating units, lines, transformers and load within the state in consultation with ERLDC. The sequence of operation shall include opening, closing/tripping of circuit breakers, isolators, on-load tap-changers etc.
8.4 Restoration Procedure
1. Detailed procedure for restoration of the State Transmission System shall be prepared by SLDC for the following contingencies and shall be in conformity with the System Restoration Procedure of the Eastern Region prescribed under IEGC.
- Total System Black out - Partial System Blackout - Synchronisation of System Islands and System Split
2. The restoration process shall take into account the generator capabilities and the operational constraints of Regional and the State Transmission System with the object of achieving normalcy in the shortest possible time. All Users should be aware of the steps to be taken during major Grid Disturbance and system restoration process.
30 BIHAR GAZETTE (EXTRA) 23RD JULY 2010
8.5 Special Considerations
1. During restoration process following the State Transmission System or Regional System blackout conditions, normal standards of voltage and frequency need not be applied and left to the discretion of the SLDC.
2. Distribution Licensees with essential loads shall separately identify non-essential components of such loads, which may be kept off during system contingencies. They shall also draw up an appropriate schedule with corresponding load blocks in each case. The nonessential loads can be put on only when system normalcy is restored, as advised by SLDC.
3. All Users shall pay special attention to carry out the procedures so that secondary collapse due to undue haste or inappropriate loading is avoided.
4. Despite the urgency of the situation, careful, prompt and complete logging of all operations and operational messages shall be ensured by all Users to facilitate subsequent investigation into the incident and the efficiency of the restoration process. Such investigation shall be conducted promptly after the incident and placed before the Grid Code Review Panel in its next meeting.
Section-9: Cross Boundary Safety
9.1 Introduction This section specifies the requirements for safe working practices for maintenance of equipment associated with cross boundary operations. It lays down the procedure to be followed when work is required to be carried out on electrical equipment that is connected to another User's system.
9.2 Objective The objective of this section is to achieve an agreement and consistency on the principles of safety as prescribed in the Indian Electricity Rules 1956 which are in force for time being and will be replaced by the rules made under Electricity Act, 2003 when working across the inter user boundary between one User and another User.
9.3 Designated Officers STU and all Users shall nominate suitable authorized persons to be responsible for the co-ordination of safety across their boundary. These persons shall be referred to as Designated Officer(s) (or control person(s).
9.4 Procedure
1. STU shall issue a list of Designated Officers (names, designations and telephone numbers) to all Users who have a direct inter user boundary with STU or other Users. This list shall be updated promptly whenever there is change of name, designation or telephone number.
2. All Users with a direct inter user boundary with STU or other User system shall issue a similar list of their Designated Officers to STU or other User(s), which shall be updated promptly whenever there is a change in the list.
3. Whenever work across a cross boundary / an inter-user boundary is to be carried, the Designated Officer of the User including STU itself, wishing to carry out work shall personally contact the other relevant Designated Officer. If the Permit to Work (PTW) cannot be obtained 31 BIHAR GAZETTE (EXTRA), 23RD JULY 2010 personally, the Designated Officers shall contact through telephone and exchange Code words to ensure correct identification of both agencies.
4. Should the work extend over more than one shift, the Designated Officer shall ensure that the relief Designated Officer is fully briefed on the nature of the work and the code words in operation.
5. The Designated Officer(s) shall co-operate to establish and maintain the precautions necessary for the required work to be carried out in a safe manner. Both the established isolation and the established earth shall be locked in position, where such facilities exist, and shall be clearly identified.
6. Work shall not commence until the Designated Officer of the User including STU itself, wishing to carry out the work, is satisfied that all the safety precautions have been established. This Designated Officer shall issue agreed safety documentation (PTW) to the working party to allow work to commence. The PTW in respect of specified EHV lines and other interconnections shall be issued with the consent of SLDC.
7. When work is completed and safety precautions are no longer required, the Designated Officer who has been responsible for the work being carried out shall make direct contact with the other Designated Officer to return the PTW and for removal of those safety precautions. Return of PTW in respect of specified EHV lines and interconnections shall be informed to SLDC.
8. The equipment shall only be considered as suitable for connecting back to service when all safety precautions are confirmed as removed, by direct communication using code word contact between the two Designated Officers, and after ensuring that the return of agreed safety documentation (PTW) from the working party has taken place.
9. STU shall develop an agreed written procedure for inter-user boundary safety and continually update it.
10. Any dispute concerning inter user Boundary Safety shall be resolved at the level of STU, if STU is not a party. In case STU is a party, the dispute shall be referred to BERC for resolution of the dispute.
9.5 Special Consideration
1. For inter-user boundary between STU and other User’s circuits, all Users shall comply with the agreed safety rules, which must be in accordance with IE Rules or Rules framed under the Act.
2. Each Designated Officer shall maintain a legibly written safety logbook, in chronological order, of all operations and messages relating to safety co-ordination sent and received by him. All safety logs shall be retained for a period of not less than 10 years.
32 BIHAR GAZETTE (EXTRA) 23RD JULY 2010 Section-10: Operational Event/ Accident Reporting
10.1 Introduction This section describes the reporting procedure of reportable events in the State Transmission System This section applies to SLDC, STU and all entities embedded within state power system that are under the control and supervision of SLDC.
10.2 Objective The objective of this section is to define the events/ incidents to be reported, the reporting route to be followed and the information to be supplied to ensure a consistent approach in reporting of incidents and accidents in the State Transmission System.
10.3 Reportable Events Any of the following events that could affect the State Transmission System requires reporting:
a. Exceptionally high / low system voltage or frequency.
b. Serious equipment problem relating to major circuit breaker, transformer or bus bar.
c. Loss of major Generating Unit. System split, State Transmission System breakaway or Black Start.
d. Tripping of Transmission Line, ICT (Inter connecting transformer) and capacitor banks.
e. Major fire incidents.
f. Force-Majeure condition like flooding or lightening etc.
g. Major failure of protection.
h. Equipment and Transmission Line overload.
i. Accidents-Fatal and Non-Fatal.
j. Load Crash / Loss of Load k. Excessive Drawal deviations.
l. Minor equipment alarms.
The last two reportable incidents are typical examples of those which are of lesser consequence, but which still affect the State Transmission System and can be reasonably classed as minor. They will require corrective action but may not warrant management reporting until these are repeated for sufficient time.
10.4 Reporting Procedure
1. Reporting Time for events and accidents All reportable incidents occurring on lines and equipment of 33 kV and above and all the lines on which there is the inter user flow affecting the State Transmission System shall promptly be reported orally by the User whose equipment has experienced the incident (the reporting User) to any other significantly affected Users and to SLDC. The reporting user should submit a written confirmation to SLDC within one hour of such oral report.
If the reporting incident is of major nature then the Reporting User shall submit an initial written report within two hours to SLDC. This has to be further followed up by the submission of a comprehensive report within 48 hours of the submission of the initial written report.
In other cases the Reporting User shall submit a report within 5 (five) days to SLDC.
33 BIHAR GAZETTE (EXTRA), 23RD JULY 2010
2. SLDC shall call for a report from any User on any reportable incident affecting other Users and STU, in case the same is not reported by such User whose equipment might have been source of the reportable incident.
The above shall not relieve any User from the obligation to report events in accordance with IE Rules 1956 – (Language used in the Code to be used). The format of such a report shall be as agreed by the State Grid Code Review Panel, but will typically contain the following information:
i. Location of incident.
ii. Date and time of incident.
iii. Plant or equipment involved.
iv. Details of relay indications with nature of fault implications, Antecedent conditions like line flows, bus voltage, generation and demand v. Supplies and quantum interrupted and duration if applicable.
vi. Amount of generation lost if applicable and its duration vii. Brief description of incident.
viii. Estimate of time to return to service.
ix. Name of Organisation x. Possibility of alternate arrangement of supply
10.5 Reporting Form The standard reporting form other than for accidents shall be as agreed from time to time by the Grid Code Review Panel. A typical form is attached (APPENDIX-E).
10.6 Major Grid Incidence
(a) Following a major grid incident, SLDC and other Users shall cooperate to inquire and establish the cause of such failure and make appropriate recommendations. SLDC shall report the occurrence of such major grid failure to the Commission in writing as well as ERLDC immediately for information and shall submit the enquiry report to the Commission within two months of the incident.
Analysis of major grid disturbance in the Intra State Power System soon after their occurrence shall be done by a Protection subcommittee constituted by STU.
(b) Periodic Reports – All distribution licensees shall send a weekly report to SLDC on the performance of their respective systems which should cover the following information:
(i) Voltage profile at all S/Stns (66KV) 132KV and above.
(ii) Average, maximum, minimum demand (both MW and MVAR) met at such S/Stns.
(iii) Quantum and duration of load shed, with reasons
(iv) Outage of major elements
(v) Network constraints
(vi) Daily energy consumed and energy exchanged by the DISCOM
(c) SLDC shall post in its website a monthly performance report of the State as a whole covering:
34 BIHAR GAZETTE (EXTRA) 23RD JULY 2010
(i) Hourly demand met and generation for peak ay and minimum demand met day. Also the average daily off-peak and peak demands met.
(ii) Daily average consumption
(iii) Stationwise daily maximum, minimum and average generation (MW), together with daily energy generation
(iv) Instances of non-compliance of the State Grid Code
(v) Progress of construction of new generating units, lines and transformers. Details of generation and transmission outages during the month.
10.7 Accident Reporting Report of accidents shall be in accordance with the section 161 of the Electricity Act, 2003 and the rules framed thereunder. Receipt of accident and failure of supply or transmission of electricity shall be in the specified form to the Commission and the Electrical Inspector.
CHAPTER-4: SCHEDULING AND DESPATCH CODE Section-11: Scheduling and Despatch
11.1 Introduction This section specifies the procedure to be adopted for the scheduling and despatch of State Generating Station (SGS) and Inter-State Generating Station (ISGS) to meet system demand and drawal allocation requirements of Distribution Licensees.
11.2 Objective The objective of this section is to detail the actions and responsibilities of SLDC in preparing and issuing a daily schedule of generation to the SGSs within its ambit, drawal schedule of various distribution licensees and other entities utilizing the intra-state transmission system, furnishing requisition from Eastern Region ISGS to ERLDC, including details of bilateral transactions to be scheduled with other regional entities.
11.3 General The following specific points would be taken into consideration while preparing and finalising the schedules:
1. SLDC will issue despatch instructions required to regulate all generation and imports from IPPs / CPPs according to the 15-minute day ahead generation schedule. In the absence of any despatch instruction by SLDC, SGS shall generate/ export according to the dayahead generation schedule.
2. The SLDC shall regulate the overall state generation in such a manner that generation from following types of power stations shall not be curtailed except under abnormal operating conditions.
(i) Run of river or canal based hydro stations.
(ii) Storage type hydro-stations when water level is at peak reservoir level or expected to touch peak reservoir level as per inflows.
(iii) Generation from non-conventional sources like wind, solar that cannot be stored/ controlled.
3. Despatch instructions to SGS shall be in standard format to be finalized by SLDC.
35 BIHAR GAZETTE (EXTRA), 23RD JULY 2010
4. The algebraic sum of scheduled drawals from ISGS, long term open access, and short term open access arrangements shall be the net drawal schedule for the control area of the utility.
11.4 Generation Scheduling 1) Steps in Scheduling Step by step procedure for scheduling of ISGS and SGS/IPP/CPP embedded in the state power system (not having the status of regional entity shall be as described below:
i. By 9.00 hours every day each SGS shall intimate to SLDC the station wise ex- power plant MW and MWh capabilities foreseen for the next day i.e. between 00.00 to 24.00 hrs of the following day, at 15 minutes interval.
ii. By 9.00 hours every day each Distribution Licensees bulk power consumer shall intimate SLDC the overall requirement in MW and MWh for the next day at 15 minutes interval.
iii. After receipt of the information in regard to the availability from different sources, the SLDC shall review aggregate generating capability of ISGS, SGS and the bilateral interchanges, if any, vis-à- vis Distribution Licensees requirements.
iv. By 15.00 hrs, SLDC shall finalise (a) generation schedule of SGS and (b) drawal schedule of each Distribution Licensees. It shall accordingly advise each Distribution Licensees of their drawal schedule and will workout and convey to ERLDC for net drawal schedule in each of the ISGS along with the bilateral exchanges agreed or intended to be had with the other state / states and the estimates of demand / availability in the state and additional power it would like to draw subject to availability.
v. By 1700 hrs, ERLDC shall convey to SLDC the drawal schedule for Bihar State from each of the ISGS and other short-term bilateral, medium term and long-term schedules and SLDC shall convey to SGS the generation schedule and drawal schedule to Distribution Licensees by 1900 hrs.
vi. SGS and each Distribution Licensees may inform the modifications / changes to be made, if any, in the above schedule to SLDC by
21.30 hours.
vii. SLDC after considering the same shall convey revised schedule to ERLDC by 22.00 hrs.
viii. On receipt of information and after due consultations, the ERLDC shall issue the final generation and drawal schedule by 23.00 hrs, and SLDC shall inform the same to all concerned.
2) SLDC shall prepare the day ahead generation schedule keeping in view the following:
(i) Transmission System constraints from time to time.
(ii) 15 minute load requirements as estimated by SLDC.
(iii) The need to provide operating margins and reserves required to be maintained.
(iv) The availability of generation from SGS, Central Sector Generators and others together with any constraint in each case.
36 BIHAR GAZETTE (EXTRA) 23RD JULY 2010 3) During the day of operation, the generation schedule may be revised under following conditions:
i. In case of forced outage of a unit of any SGS, SLDC may revise the generation schedule on the basis of revised declared capability by the affected SGS.
ii. ERLDC may revise the schedule of drawal from Eastern Region and consequently SLDC shall enforce the revisions within Bihar.
11.5 Drawal Scheduling SLDC is responsible for collection, examination and compilation of drawal Schedule for each Distribution Licensee in prescribed manner and at the prescribed time. Each Distribution Licensee shall supply to SLDC 15- minute average demand estimates in MW for the day ahead.
11.6 Generation Despatch
1. SGS and embedded CPP/IPP shall comply promptly with a despatch instruction issued by SLDC unless this action would compromise the safety of plant or personnel. SGS and embedded CPP/IPP shall promptly inform SLDC in the event of any unforeseen difficulties in carrying out an instruction.
2. Despatch instructions shall be issued by E-Mail /Fax/ telephone, confirmed by exchange of name of operators sending and receiving the same and logging the same at each end. All such oral instructions shall be complied with forthwith and written confirmation shall be issued promptly by FAX, tele-printer or otherwise
11.7 Responsibilities
1. SLDC shall monitor actual power drawal against scheduled power drawal and regulate internal generation and demand to maintain this schedule. SLDC shall also monitor reactive power drawal and availability of capacitor banks.
2. Generating Stations within the State shall follow the despatch instructions issued by SLDC.
3. Distribution Licensees and Open Access Customers shall comply with the instructions of SLDC for managing load & reactive power drawal as per system requirement.
Section-12: Frequency and Voltage Management
12.1 Introduction This section describes the method by which all Users of the State Transmission System shall co-operate with SLDC and STU in contributing towards effective control of the system frequency and managing the voltage of the State Transmission System. The State Transmission System normally operates in synchronism with the Eastern Region Grid and ERLDC has the overall responsibility of the integrated operation of the Eastern Regional Power System. The constituents of the Region are required to follow the instructions of ERLDC for backing down generation, regulating loads, MVAR drawal etc. to meet the objective.
SLDC shall accordingly instruct Generating Units to regulate Generation/Export and adhere to active and reactive power generation within their respective declared parameters. SLDC shall also regulate the load as may be necessary to meet the objective. The State Transmission System voltage levels can be affected by Regional operation. The 37 BIHAR GAZETTE (EXTRA), 23RD JULY 2010 STU/SLDC shall optimize voltage management by adjusting transformer taps (On Line Tap Changers) to the extent available and switching of circuits/ capacitors/ reactors and other operational steps. SLDC will instruct SGS to regulate MVAr generation within their declared parameters. SLDC shall also instruct Distribution Licensees to regulate demand, if necessary by operating reactors/ capacitor banks nearest to load point in 33KV system.
12.2 Objective The objectives of this section are as follows:
(1) To define the responsibilities of all Users in contributing to frequency and voltage management.
(2) To define the actions required to enable SLDC and STU to maintain the State Transmission System voltages and frequency within acceptable levels in accordance with IEGC guidelines as well as Planning and Security Standards for the State Transmission System specified by the Commission, if any.
12.3 Frequency Management 1) The rated frequency of the system shall be 50 Hz and shall normally be regulated within the limits prescribed in IEGC Clause 4.6(b) as also specified in Connection Conditions. STU and SLDC shall make all possible efforts to ensure that grid frequency remains within 49.5 Hz–
50.2 Hz band.
2) Falling frequency Under falling frequency conditions, SLDC shall take appropriate action to issue instructions, in co-ordination with ERLDC to arrest the falling frequency and restore frequency within permissible range. Such instructions may include despatch instruction to SGS and/or instruction to Distribution Licensees and Open Access Customers to reduce load demand by appropriate manual and/or automatic load shedding.
3) Rising frequency Under rising frequency conditions, SLDC shall take appropriate action to issue instructions to SGS in co-ordination with ERLDC to arrest the rising frequency and restore frequency within permissible range. SLDC shall also issue instructions to Distribution Licensees and Open Access Customers in coordination with ERLDC to lift Load shedding (if exists) in order to take additional load. In case of Load Crash, SLDC shall take steps as per Clause 6.6 of the Grid Code.
12.4 Voltage Management 1) Users using the State Transmission System shall make all possible efforts to ensure that the grid voltage always remains within the limits specified in IEGC at clause 5.2 (r) and IE Rules 1956 as re-produced below:
Voltage (KV rms) Nominal Maximum Minimum 400 420 380 220 245 198 132 145 122 38 BIHAR GAZETTE (EXTRA) 23RD JULY 2010 2) STU and/or SLDC shall carry out load flow studies based on operational data from time to time to predict where voltage problems may be encountered and to identify appropriate measures to ensure that voltages remain within the defined limits. On the basis of these studies, SLDC shall instruct SGS to maintain specified voltage level at interconnecting points.
SLDC shall continuously monitor 220/132kV voltage levels at strategic sub-stations.
3) SLDC shall take appropriate measures to control State Transmission System voltages, which may include but not be limited to transformer tap changing, capacitor / reactor switching including capacitor switching by Distribution Licensees at 66 KV & 33 KV substations, operation of Hydro unit as synchronous condenser and use of MVAr reserves with State Generating Stations within technical limits agreed to between STU and Generators. Generators shall inform SLDC of their reactive reserve capability promptly on request.
4) Distribution Licensees and Open Access Customers shall participate in voltage management by providing Local VAR compensation (as far as possible in low voltage system close to load points) such that they do not depend upon EHV grid for reactive support.
Section-13: Monitoring of Generation and Drawal
13.1 Introduction The monitoring of SGS output, active and reactive reserve capacity is important to evaluate the performance of generation plants.
The monitoring of actual drawal against schedule is important to ensure that STU and Distribution Licensees contribute towards improving system performance and observe Grid discipline.
13.2 Objective The objective of this section is to define the responsibilities of all SGS in monitoring of Generating Unit reliability and performance, and STU’s/ Discoms’ compliance with the scheduled Drawal to assist SLDC in managing voltage and frequency.
13.3 Monitoring Procedure
(1) For effective operation of the State Transmission System, it is important that a SGS’s declared availability is realistic and that any departures are continually and invariably fed back to the Generator to help effect improvement.
(2) The SLDC shall continuously monitor Generating Unit outputs and Bus voltages. More stringent monitoring may be performed at any time when there is reason to believe that a SGS’s declared availability may not match the actual availability or declared output does not match the actual output.
(3) SLDC can ask for putting a generating station to demonstrate the declared availability by instructing the generating station to come up to the declared availability within time specified by generators.
39 BIHAR GAZETTE (EXTRA), 23RD JULY 2010
(4) SLDC shall inform SGS, in writing, if the continual monitoring demonstrates an apparent persistent or material mismatch between the despatch instructions and the Generating Unit output or breach of the Connection Conditions. Continued discrepa