The Authority, by order in writing and the reasons to be recorded, may relax any provision of these regulations in respect of any matters referred to the Authority on case to case basis.”
17. In the Schedule to the said regulations, -
(a) in part I, -
(a) for paragraph (1), the following paragraph shall be substituted, namely: - “(1) These standards provide for specification of meters, immunity to external factors, sealing points and functional requirements that are required from regulatory perspective:
Provided that, detailed technical specifications shall be prepared by the Generating Company or licensee, as the case may be.”;
(b) for paragraph (2), the following paragraph shall be substituted, namely: - ¹Hkkx IIIµ[k.M 4º Hkkjr dk jkti=k % vlk/kj.k 19 “(2) Specification of meters:
1. Standard Reference Voltage, Voltage Range, Standard Frequency, Starting Current and Maximum Current, Power Factor Range, Power Frequency withstand voltage, Impulse voltage withstand test for 1.2/50 micro sec, Power Consumption As per relevant Indian Standards (IS).
2. Standard Basic Current As per relevant IS. Current range of consumer meters shall be so chosen as to record the load current corresponding to the sanctioned load.
3. Accuracy class Meters shall meet the following requirements of Accuracy Class:
(a) Interface Meters 0.2S
(b) Consumer Meters
(i) Upto 650 Volts Direct Connected
1.0
(ii) Upto 650 volts CT Connected Class 0.5S as per relevant IS where separate CTs are used Or Class 1.0 as per relevant IS for terminal less direct connected long current range meters.
(iii) Above 650 volts and up to 33 kilo volts
0.5S
(iv) Above 33 kilo volts 0.2S
(c) Energy Accounting and Audit Meters
(i) In generating stations, the accuracy class of meter(s) at a point after the generator stator terminals, before the tap off to the unit auxiliary transformer(s) and at the inverter AC output terminals in case of Renewable Energy generating station, shall not be inferior to that of
0.2S accuracy class:
Provided that, the accuracy class of other meters shall not be inferior to that of 1.0S accuracy class.
(ii)The accuracy class of meters in transmission system shall not be inferior to that of 0.2S accuracy class.
(iii) The accuracy class of meters in distribution system shall not be inferior to that of 0.5S accuracy class where separate CTs are used with meter:
Provided that in case of terminal less direct connected long current range meters accuracy class shall not be inferior to class 1.0.
(iv) The accuracy class of Energy accounting and Audit Meters for renewable energy generating station located at consumer premises shall be same as that of consumer meter.
4. Ambient Temperature and Humidity (in case an International Standard or an IEC Standard is followed) Temperature range:
Limit range of operation: -10 °C to +70 °C Limit range for storage and transport: -10 °C to +70 °C Relative Humidity: up to 100% 20 THE GAZETTE OF INDIA : EXTRAORDINARY [PART III—SEC. 4] Note: (1) For Special applications other temperature values can be used according to agreement between manufacturer and purchaser.
(2) Operation, storage and transport of the meter at the extremes of the temperature range should be for a maximum period of six hours.
5. Only fundamental frequency quantities shall be measured and computed while measuring Wh and VArh.”;
(c) for paragraph (3), the following paragraph shall be substituted, namely:- “(3) Meter shall have one port for downloading facilities of metered data through Common Meter Reading Instrument (CMRI) and another port/system for remote communication.”;
(d) for paragraph (5), the following paragraph shall be substituted, namely:- “(5) Sealing Points: Sealing shall be done at the following points (as applicable):
(a) Meter body with cover (Not applicable if integrated body is used),
(b) Meter terminal cover ,
(c) Meter test terminal block ,
(d) Meter cabinet/ panel,
(e) Instrument Transformer(s) terminal box for metering purpose, and junction box, if any.”;
(e) for paragraph (6), the following paragraph shall be substituted, namely:- “(6) (a) The accuracy class of Instrument Transformer shall not be inferior to that of associated meters.
(b) The Instrument Transformer shall comply with relevant Indian Standards.
(c) The existing Instrument Transformer not complying with these regulations shall be replaced by new Instrument Transformer, if found defective or non-functional.”;
(f) paragraph (7), shall be omitted.
(b) in part II, in paragraph (1),-
(a) for sub-paragraphs (a) and (b), the following sub-paragraph shall be substituted, namely:- “(a) The Interface Meters shall be three phase four wire static type, composite meters, self–contained devices for measurement of active and reactive energy, and certain other parameters as described in the following paragraphs:
Provided that, the meters shall be suitable for being connected directly to voltage transformers (VTs) having a rated secondary line-to-line voltage of 110 V, and to current transformers (CTs) having a rated secondary current of 1A or 5A:
Provided further that, the reference frequency shall be 50Hz.
(b) The meters shall have a non-volatile memory capable of storing data for a period of at least last ten days and shall be able to measure following parameters in the manner specified, in addition to those specified in the relevant Indian Standards:
(i) average frequency for each successive time block upto 2 decimal truncation;
(ii) net Wh transmittal during each successive time block upto two decimal, with plus sign for active power sent out from station busbars and minus sign for active power received into the busbars;
(iii) cumulative Wh transmittal at each midnight, in eight digits including one decimal;
(iv) cumulative VArh transmittal for voltage high condition, at each midnight, in eight digits including one decimal;
(v) cumulative VArh transmittal for voltage low condition, at each midnight, in eight digits including one decimal;
(vi) date and time blocks of failure of VT supply on any phase, as a star(*) mark and (Z) mark in case of complete voltage failure;
(vii) net VArh transmittal during each successive time block upto two decimal with plus sign for reactive power sent out from station busbars and minus sign for reactive power received into the busbars;
(viii) average voltage upto 2 decimal truncation:
¹Hkkx IIIµ[k.M 4º Hkkjr dk jkti=k % vlk/kj.k 21
Provided that the time block for recording of meter data by the meter shall be 15 minutes or as specified by the Central Commission.”;
(b) sub-paragraph (c) shall be omitted.
(c) sub-paragraph (d), shall be omitted.
(d) for sub-paragraphs (e), (f), (g) and (h), the following sub-paragraphs shall be substituted, namely:- “(e) There shall be two reactive energy registers, one for the period when average RMS voltage is above 103% and the other for the period when the voltage is below 97%.
(f) The Wh recording shall have a +ve sign when there is a net Wh export from substation busbars, and a –ve sign when there is a net Wh import:
Provided that the integrating (cumulative) registers for Wh and VArh shall move forward when there is Wh or VArh export from substation busbars, and backward when there is an import.
(g) The meters shall also display (on demand), by turn, the following parameters :
(i) Unique identification number of the meter,
(ii) Date,
(iii) Time,
(iv) Cumulative Wh register reading,
(v) Average frequency of the previous time block,
(vi) Net Wh transmittal in the previous time block, with +/-sign,
(vii) Average percentage voltage,
(viii) Reactive power with +/- sign,
(ix) Voltage-high VArh register reading,
(x) Voltage-low VArh register reading,
(xi) Net VArh transmittal in the previous time block, with +/-sign.
(h) (i) the three line-to-neutral voltages shall be continuously monitored, and in case any of these falls below 80%, the same shall be suitably indicated and recorded in the meter memory.
(ii) the meters shall normally operate with the power drawn from the VT secondary circuits:
Provided that there shall be provision to operate the meters from AC and DC auxiliary power supply.
(iii) each meter shall have a built-in calendar and clock and shall have facility of automatic time synchronisation.
(iv) the meters shall be properly sealed and tamper evident with no possibility of any adjustment at site.”;
(e) clause (i), shall be omitted;
(f) for sub-paragraph (j), the following sub-paragraph shall be substituted, namely:- “(j) The Main Meter and the Check Meter shall be connected to same core of Instrument Transformer.”;
(g) after sub-paragraph (j), the following sub-paragraphs shall be inserted, namely:- “(k) All new meters shall have capability of recording frequency in steps of 0.01 Hz.
(l) All new meters shall be re-configurable at site for change of time block as specified by the Central Commission.”.
(iii) In part III,-
(a) for paragraphs (1) and (2), the following paragraphs shall be substituted, namely:- “(1) The Consumer Meter shall have the facilities to measure, record and display parameters depending upon the tariff requirement for various categories of consumers in line with the relevant Indian Standards:
Provided that the consumer meter shall also have facility to log and display tamper related events as per the requirement of licensee.
(2) All meters shall have data storage capacity for at least 35 days in a non-volatile memory.”;
(b) in paragraph (3), for item (i) and the NOTE thereunder, the following shall be substituted, namely:- 22 THE GAZETTE OF INDIA : EXTRAORDINARY [PART III—SEC. 4] “(i) Additional anti-tampering features including logging of tampers such as current circuit reversal, current circuit short or open and presence of abnormal magnetic field may be provided as per the regulations or directions of the Appropriate Commission.
NOTE.- Smart Meter is bi-directional and therefore anti tamper feature stipulated at (3) (e) above shall not be applicable.”;
(v) Part IV, paragraph (1), shall be omitted;
(v) In Part IV, for paragraph (2), the following paragraph shall be substituted, namely:- “(2) The Energy Accounting and Audit Meters shall have the facility to measure, record and display parameters depending upon the energy accounting and audit requirement of the respective Generating Company or licensee in line with relevant Indian Standards.” P. C. KUREEL, Secy.
[ADVT.-III/4/Exty./375/19] Note: The principal regulations were published in the Gazette of India, Extraordinary, Part III, Section 4, vide notification No. 502/70/CEA/DP&D, dated the 22 nd March, 2006 and last amended vide notification No.
23/47/2014-R&R (Vol.III), dated the 03 rd December, 2014.
Uploaded by Dte. of Printing at Government of India Press, Ring Road, Mayapuri, New Delhi-110064 and Published by the Controller of Publications, Delhi-110054.
2019-12-27T19:17:28+0530 MANOJ KUMAR VERMA