15.2. Objective.
15.3. Scope.
15.4. Applicability.
(ii) STU/Transmission Licensees
(iii) Generating Stations connected to State Transmission System
(iv) Distribution Licensees connected with State Transmission System
(v) EHV Consumers of Distribution Licensee(s) directly connected to State Transmission System
(vi) Open Access Customers availing Open Access on State Transmission system
(vii) Captive Generators connected to State Transmission System
15.5. Reference Standards.
15.6. Meter Installation.
15.7. Various Standards for Metering Equipment.
SI. No.
Particulars
Meter Type
Main & Check
Back up
Capacitor Bank
Sub-Station Auxiliary
Inter Distribution Licensees
Secondary Back up
1
2
3
4
5
6
7
8
(1)
Accuracy class
(a) Meter
0.2 S
0.2 S
0.5 S
1.0
0.2 S
0.2 S
(b) CTs
0.2
0.2
0.2
0.2
0.2
0.2
(c) PTs / CVTs
0.2
0.2
0.2
0.2
0.2
0.2
(d) CT-PT sets for 33 KV & 11 KV feeders
0.2
Existing
Existing
Existing
Existing
Existing
(2)
Salient aspect of meters
(a) Phase angle and ratio error compensation of
CTs & PTs
No
No
No
No
No
No
(b) Communication port
(i) Optical port
Yes
Yes
No
No
Yes
Yes
(ii) For remote reading
Yes
Yes
No
No
Yes
Yes
(c) Whether both Import & Export features
required
Yes
Yes
No
No
Yes
Yes
(d) Meter memory for 45 days
Yes
Yes
No
No
Yes
Yes
i. Operating System Parameters (for balanced and unbalanced load):
a. Operating Voltage Range: The meter shall work satisfactorily on 110 Volts AC (Line-Line) or 415 Volts AC (Line-Line) with variation range of -40% to +20%.
b Operating Frequency Range: The meter shall work satisfactorily on 50 Hertz with variation range of -5% to +5%.
c. Operating Power Factor Range: The meter shall work satisfactorily over a power factor range of zero lag to unity to zero lead.
ii. Measuring Elements:
a The meter shall be 3 phase 4 wire type, capable to record and display import and export kWh, kVArh, kVAh and maximum demand in kW and kVA for 3 phase 4 wire AC balanced/unbalanced load for a power factor having range of zero lagging to unity to zero leading in all 4 quadrants. In addition, meter shall also be capable of displaying, on demand, the present status of supply/load, missing potential, CT polarity, current unbalance, anomaly occurrence and logging of occurrences as well as load survey data etc. which shall be down loaded to a user friendly Base Computer System (BCS) through portable data collection devices or CMRI which shall be connected to optical communication port of the meter. Meter shall be equipped with self-diagnostic features also and be capable of recording average values based on their integration on time base for kWh, kVArh, kVAh for at least 45 days. Meter shall be capable of measuring fundamental as well as total energy including harmonics separately.
b. Energy measurement during demand period shall be such that sampling in the meter is synchronized with the end of the time block otherwise energy measured in a demand period but not stored in that period shall be carried forward. An LED glow or pulse output coincident with end of each demand period need be provided in the meter so as to ensure that demand integration coincided the preset time block.
iii. Display. - Present meter status, real time and date, cumulative energy registers, voltage, currents, power factor, present demand, frequency and meter serial number shall be available on demand through push button. Any interrogation/read operation shall not delete or alter any stored meter data.
iv. Memory. - Numerical values of voltage/current, power factor and cumulative energy registers as well as anomalies/tampered details alongwith date and time of logging of and restoration of anomalies (subject to the meter memory space) shall be logged in the meter memory and shall be available for retrieving with the help of the data collection devices (CMRI) through meter optical port and down loading to BCS.
a. Memory in a static tri-vector meter shall not get 'erased' after reading or retrieving of data through CMRI. Data shall be retained for a minimum of 45 days or shall not get erased from meter until replaced by fresh data. However, desired data can be erased from CMRI, when memory of a CMRI becomes full after downloading of readings of a number of meters, as there is fixed space made available in CMRI for:
i. Energy registers.
ii. Load survey data.
iii. Anomaly data etc.
When a fresh data is logged in the memory, the oldest data shall disappear automatically.
v. Test terminal blocks . - The test terminal blocks shall be provided on all meters to facilitate testing of meters in service. Main & back up meters of inter state / major generating stations shall be having the feature of draw out type modular units and shall have automatic CT short circuiting so that meter can be taken out for testing without shut down requirements.
vi. Meter Power Supply. - Meters of inter state / major generating stations shall be capable of powered with 230 volt alternating current auxiliary supply and 110 volt or 220 volt DC supply of the substation so that metering core of PT/ CVT is never loaded and in case of shut down on feeder/breaker, meter can be interrogated locally or remotely. It shall normally be powered by AC auxiliary supply and shall be switched over to DC supply only when AC auxiliary supply fails.
vii. Battery back-up . - The meter shall have battery back up for its Real Time Clock (RTC).
viii. Meter Programmability. - The meters shall be equipped with necessary hardware/software to suit tariff requirements such as ABT, TOD, two-part tariff based on SMD as may be called for from time to time.
a. Three single-phase type current transformers shall be used for 3 phase 4 wire and 3 phase 3 wire measurement system. The secondary current rating of the CTs shall be 1 Ampere particularly for 220 KV, 132 KV, 66 KV measurements. However existing CTs with 5-Ampere secondary current shall also be acceptable provided the connected meters and instrument have base 5 Ampere current rating. For other voltages, 1 Ampere or 5 Ampere shall be employed.
b. The current transformers shall have dedicated core for metering and wherever feasible, the cores feeding to main meters and check meters shall be separate. The errors of the current transformers shall be checked in the laboratory or at site. However if such facilities are not available, CT test certificates issued by a Government test house or Government recognized test agency shall be referred to.
c. The total burden connected to each current transformer shall not exceed the rated burden of CT.Total circuit burden shall be kept close to rated burden of CT for minimum error.
a. Either Electromagnetic Voltage Transformers (EVT) or Capacitive Voltage transformer (CVT) should be used for metering purpose. Generally, term VT is used to cover either EVT or CVT. The secondary voltage per phase shall be 110/31/2 volts or 415/31/2 volts. Either dedicated VTs or dedicated core of VTs shall be provided for metering and that wherever feasible, VTs (or their cores) feeding to main meters and backup/check meters shall be separate. Fuses of proper rating shall be provided at appropriate locations in the VT circuit,
b. The errors of the VTs shall be checked in the lab or at site. However if such facilities are not available, VT test certificates issued by Government test house or Government recognized test agency should be referred to.
c. The total burden connected to each VT shall not exceed the rated burden of VT. Voltage drop in VT leads shall be within the permissible limits.
d. The current transformers and voltage transformers shall meet the requirements as per the relevant standards. Where a combined CT/PT unit is provided, the accuracy shall be as specified under relevant IS.
15.8. Testing Arrangement.
a. Meter test bench with high accuracy, static source and 0.02S class electronic reference standard meter (RS Meter) shall be used for testing and calibration of meters. Meter Testing Laboratories duly equipped with testing benches and other equipments shall be established at suitable locations for testing and calibration of meters by SGS, STU and Distribution Licensee. The Meter Testing benches with 0.02S-class reference standard meter shall also be used for checking and calibration of portable testing equipments.Testing, calibration and maintenance of Energy Meters shall conform to the requirement of IS: 9792 and Testing equipments shall conform to Indian Standards Specification IS: 12346.
b. Portable test set with static source and electronic reference meter of 0.1 class shall be used for verification and joint testing of accuracy of static tri-vector meters at site on regular/routine basis.
15.9. Meter Reading.
15.10. Joint Inspection, Testing, Calibrations.
15.11. Sealing.
ii. Any seal, applied, shall not be broken or removed except in the presence of or with the prior consent of the agency affixing the seal or on whose behalf the seal has been affixed unless it is necessary to do so in circumstances where (a) both main and check meters are malfunctioning or there occurs a fire or similar hazard and such removal is essential and such consent can not be obtained immediately (b) such action is required for the purpose of attending to the meter failure. In such circumstances, verbal consent shall be given immediately and it must be confirmed in writing forthwith.
iii. Each agency shall control the issue of its own seals and sealing pliers, and shall keep proper register/record of all such pliers and the authorized persons to whom these are issued.
iv. Sealing of the metering system shall be carried out in such a manner so as not to hamper downloading of the data from the meter using CMRI or a remote meter reading system.
15.12. Interface Metering Arrangement.
a. Meters shall be installed on each Generator terminal, at each Unit Auxiliary Transformer (UAT), and all outgoing feeders at Generating Stations to work out energy generated and net energy delivered by the Power Station in the Grid.
b. For measurement of energy supplied by major generating stations within the state, meters shall be provided on each outgoing feeder at the power station designated as main meter for billing purpose as per commercial agreement and/or Grid Code Connectivity Conditions.
c. A Check Meter shall also be provided along with the Main Meter. Meters on each generator and each auxiliary transformer shall work as backup meters.
a For measurement of power delivered by STU to Distribution Licensee, metering shall be provided on the LV side of EHV Power Transformer i.e. 33 KV side of 220/33 KV and 33 KV side of 132/33 KV and 11 KV side of 132/33/11 KV and 11 KV side of 132/11 KV transformers installed in EHV sub-stations.
b Operational meters shall also be provided on all outgoing 33 KV and 11 KV feeders as back-up meter for energy audit on feeder and reconciliation of energy with respect to energy measured on LV side of EHV Power Transformer.
c. In case of EHV industrial and other consumers directly fed from 220 KV or 132 KV sub-stations, tariff metering shall be provided on outgoing feeder emanating from EHV sub-station.
a. The energy metering shall be provided at such points of the power lines connecting any two Distribution Systems owned by different Distribution Licensees so that the measured energy gives correct measurement of consumption by either Distribution Licensee.
b. If installation of metering at such point is not feasible, it shall be provided at nearest sub-station feeding other Distribution System. In such case, energy accounting may be in proportion to installed capacity of Distribution Transformers on the line or as agreed mutually.
15.13. Supervisory Control and Data Acquisition (SCADA).
15.14. ABT,Two part and TOD Tariff Capability.
i. Frequency based ABT compliant meters shall be provided on 33 kV or lower voltage lines feeding each Distribution Licensee area of supply. The function of these meters will be as under:
a. To measure Distribution Licensee-wise Ul (Unscheduled Interchange) energy and corresponding average frequency during 15 minute block.
b. The Distribution Licensee wise summation of kWh, kW, PF, demand, scheduled interchange/ unscheduled interchange will be done at the main computer station provided at central billing station or at Load Despatch Centre.
c. For this purpose, the various parameters shall be integrated at one centrally located station preferably at State Load Despatch Centre at Patna through computer and suitable software.
ii. Static tri-vector meters to be provided on LV secondary side of all EHV transformers. The function/duty of this meter will be as under:
a. Measurement of kWh energy supplied to Distribution Licensee for billing purpose.
b. kW/kVA demand and power factor, 15 minute block-wise as well monthly caused by Discom on each EHV transformer.
Section 15 • Bihar Electricity Grid Code, 2010
15. Metering Code.
bihar-electricity-grid-code-2010-sec-15.json
•
Section 15
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"section": {
"number": "15",
"title": "15. Metering Code.",
"chapter": null,
"content": "15.2. Objective.\n15.3. Scope.\n15.4. Applicability.\n(ii) STU/Transmission Licensees\n(iii) Generating Stations connected to State Transmission System\n(iv) Distribution Licensees connected with State Transmission System\n(v) EHV Consumers of Distribution Licensee(s) directly connected to State Transmission System\n(vi) Open Access Customers availing Open Access on State Transmission system\n(vii) Captive Generators connected to State Transmission System\n15.5. Reference Standards.\n15.6. Meter Installation.\n15.7. Various Standards for Metering Equipment.\nSI. No.\nParticulars\nMeter Type\nMain & Check\nBack up\nCapacitor Bank\nSub-Station Auxiliary\nInter Distribution Licensees\nSecondary Back up\n1\n2\n3\n4\n5\n6\n7\n8\n(1)\nAccuracy class\n(a) Meter\n0.2 S\n0.2 S\n0.5 S\n1.0\n0.2 S\n0.2 S\n(b) CTs\n0.2\n0.2\n0.2\n0.2\n0.2\n0.2\n(c) PTs / CVTs\n0.2\n0.2\n0.2\n0.2\n0.2\n0.2\n(d) CT-PT sets for 33 KV & 11 KV feeders\n0.2\nExisting\nExisting\nExisting\nExisting\nExisting\n(2)\nSalient aspect of meters\n(a) Phase angle and ratio error compensation of\n\t\t\t\tCTs & PTs\nNo\nNo\nNo\nNo\nNo\nNo\n(b) Communication port\n(i) Optical port\nYes\nYes\nNo\nNo\nYes\nYes\n(ii) For remote reading\nYes\nYes\nNo\nNo\nYes\nYes\n(c) Whether both Import & Export features\n\t\t\t\trequired\nYes\nYes\nNo\nNo\nYes\nYes\n(d) Meter memory for 45 days\nYes\nYes\nNo\nNo\nYes\nYes\ni. Operating System Parameters (for balanced and unbalanced load):\na. Operating Voltage Range: The meter shall work satisfactorily on 110 Volts AC (Line-Line) or 415 Volts AC (Line-Line) with variation range of -40% to +20%.\nb Operating Frequency Range: The meter shall work satisfactorily on 50 Hertz with variation range of -5% to +5%.\nc. Operating Power Factor Range: The meter shall work satisfactorily over a power factor range of zero lag to unity to zero lead.\nii. Measuring Elements:\na The meter shall be 3 phase 4 wire type, capable to record and display import and export kWh, kVArh, kVAh and maximum demand in kW and kVA for 3 phase 4 wire AC balanced/unbalanced load for a power factor having range of zero lagging to unity to zero leading in all 4 quadrants. In addition, meter shall also be capable of displaying, on demand, the present status of supply/load, missing potential, CT polarity, current unbalance, anomaly occurrence and logging of occurrences as well as load survey data etc. which shall be down loaded to a user friendly Base Computer System (BCS) through portable data collection devices or CMRI which shall be connected to optical communication port of the meter. Meter shall be equipped with self-diagnostic features also and be capable of recording average values based on their integration on time base for kWh, kVArh, kVAh for at least 45 days. Meter shall be capable of measuring fundamental as well as total energy including harmonics separately.\nb. Energy measurement during demand period shall be such that sampling in the meter is synchronized with the end of the time block otherwise energy measured in a demand period but not stored in that period shall be carried forward. An LED glow or pulse output coincident with end of each demand period need be provided in the meter so as to ensure that demand integration coincided the preset time block.\niii. Display. - Present meter status, real time and date, cumulative energy registers, voltage, currents, power factor, present demand, frequency and meter serial number shall be available on demand through push button. Any interrogation/read operation shall not delete or alter any stored meter data.\niv. Memory. - Numerical values of voltage/current, power factor and cumulative energy registers as well as anomalies/tampered details alongwith date and time of logging of and restoration of anomalies (subject to the meter memory space) shall be logged in the meter memory and shall be available for retrieving with the help of the data collection devices (CMRI) through meter optical port and down loading to BCS.\na. Memory in a static tri-vector meter shall not get 'erased' after reading or retrieving of data through CMRI. Data shall be retained for a minimum of 45 days or shall not get erased from meter until replaced by fresh data. However, desired data can be erased from CMRI, when memory of a CMRI becomes full after downloading of readings of a number of meters, as there is fixed space made available in CMRI for:\ni. Energy registers.\nii. Load survey data.\niii. Anomaly data etc.\nWhen a fresh data is logged in the memory, the oldest data shall disappear automatically.\nv. Test terminal blocks . - The test terminal blocks shall be provided on all meters to facilitate testing of meters in service. Main & back up meters of inter state / major generating stations shall be having the feature of draw out type modular units and shall have automatic CT short circuiting so that meter can be taken out for testing without shut down requirements.\nvi. Meter Power Supply. - Meters of inter state / major generating stations shall be capable of powered with 230 volt alternating current auxiliary supply and 110 volt or 220 volt DC supply of the substation so that metering core of PT/ CVT is never loaded and in case of shut down on feeder/breaker, meter can be interrogated locally or remotely. It shall normally be powered by AC auxiliary supply and shall be switched over to DC supply only when AC auxiliary supply fails.\nvii. Battery back-up . - The meter shall have battery back up for its Real Time Clock (RTC).\nviii. Meter Programmability. - The meters shall be equipped with necessary hardware/software to suit tariff requirements such as ABT, TOD, two-part tariff based on SMD as may be called for from time to time.\na. Three single-phase type current transformers shall be used for 3 phase 4 wire and 3 phase 3 wire measurement system. The secondary current rating of the CTs shall be 1 Ampere particularly for 220 KV, 132 KV, 66 KV measurements. However existing CTs with 5-Ampere secondary current shall also be acceptable provided the connected meters and instrument have base 5 Ampere current rating. For other voltages, 1 Ampere or 5 Ampere shall be employed.\nb. The current transformers shall have dedicated core for metering and wherever feasible, the cores feeding to main meters and check meters shall be separate. The errors of the current transformers shall be checked in the laboratory or at site. However if such facilities are not available, CT test certificates issued by a Government test house or Government recognized test agency shall be referred to.\nc. The total burden connected to each current transformer shall not exceed the rated burden of CT.Total circuit burden shall be kept close to rated burden of CT for minimum error.\na. Either Electromagnetic Voltage Transformers (EVT) or Capacitive Voltage transformer (CVT) should be used for metering purpose. Generally, term VT is used to cover either EVT or CVT. The secondary voltage per phase shall be 110/31/2 volts or 415/31/2 volts. Either dedicated VTs or dedicated core of VTs shall be provided for metering and that wherever feasible, VTs (or their cores) feeding to main meters and backup/check meters shall be separate. Fuses of proper rating shall be provided at appropriate locations in the VT circuit,\nb. The errors of the VTs shall be checked in the lab or at site. However if such facilities are not available, VT test certificates issued by Government test house or Government recognized test agency should be referred to.\nc. The total burden connected to each VT shall not exceed the rated burden of VT. Voltage drop in VT leads shall be within the permissible limits.\nd. The current transformers and voltage transformers shall meet the requirements as per the relevant standards. Where a combined CT/PT unit is provided, the accuracy shall be as specified under relevant IS.\n15.8. Testing Arrangement.\na. Meter test bench with high accuracy, static source and 0.02S class electronic reference standard meter (RS Meter) shall be used for testing and calibration of meters. Meter Testing Laboratories duly equipped with testing benches and other equipments shall be established at suitable locations for testing and calibration of meters by SGS, STU and Distribution Licensee. The Meter Testing benches with 0.02S-class reference standard meter shall also be used for checking and calibration of portable testing equipments.Testing, calibration and maintenance of Energy Meters shall conform to the requirement of IS: 9792 and Testing equipments shall conform to Indian Standards Specification IS: 12346.\nb. Portable test set with static source and electronic reference meter of 0.1 class shall be used for verification and joint testing of accuracy of static tri-vector meters at site on regular/routine basis.\n15.9. Meter Reading.\n15.10. Joint Inspection, Testing, Calibrations.\n15.11. Sealing.\nii. Any seal, applied, shall not be broken or removed except in the presence of or with the prior consent of the agency affixing the seal or on whose behalf the seal has been affixed unless it is necessary to do so in circumstances where (a) both main and check meters are malfunctioning or there occurs a fire or similar hazard and such removal is essential and such consent can not be obtained immediately (b) such action is required for the purpose of attending to the meter failure. In such circumstances, verbal consent shall be given immediately and it must be confirmed in writing forthwith.\niii. Each agency shall control the issue of its own seals and sealing pliers, and shall keep proper register/record of all such pliers and the authorized persons to whom these are issued.\niv. Sealing of the metering system shall be carried out in such a manner so as not to hamper downloading of the data from the meter using CMRI or a remote meter reading system.\n15.12. Interface Metering Arrangement.\na. Meters shall be installed on each Generator terminal, at each Unit Auxiliary Transformer (UAT), and all outgoing feeders at Generating Stations to work out energy generated and net energy delivered by the Power Station in the Grid.\nb. For measurement of energy supplied by major generating stations within the state, meters shall be provided on each outgoing feeder at the power station designated as main meter for billing purpose as per commercial agreement and/or Grid Code Connectivity Conditions.\nc. A Check Meter shall also be provided along with the Main Meter. Meters on each generator and each auxiliary transformer shall work as backup meters.\na For measurement of power delivered by STU to Distribution Licensee, metering shall be provided on the LV side of EHV Power Transformer i.e. 33 KV side of 220/33 KV and 33 KV side of 132/33 KV and 11 KV side of 132/33/11 KV and 11 KV side of 132/11 KV transformers installed in EHV sub-stations.\nb Operational meters shall also be provided on all outgoing 33 KV and 11 KV feeders as back-up meter for energy audit on feeder and reconciliation of energy with respect to energy measured on LV side of EHV Power Transformer.\nc. In case of EHV industrial and other consumers directly fed from 220 KV or 132 KV sub-stations, tariff metering shall be provided on outgoing feeder emanating from EHV sub-station.\na. The energy metering shall be provided at such points of the power lines connecting any two Distribution Systems owned by different Distribution Licensees so that the measured energy gives correct measurement of consumption by either Distribution Licensee.\nb. If installation of metering at such point is not feasible, it shall be provided at nearest sub-station feeding other Distribution System. In such case, energy accounting may be in proportion to installed capacity of Distribution Transformers on the line or as agreed mutually.\n15.13. Supervisory Control and Data Acquisition (SCADA).\n15.14. ABT,Two part and TOD Tariff Capability.\ni. Frequency based ABT compliant meters shall be provided on 33 kV or lower voltage lines feeding each Distribution Licensee area of supply. The function of these meters will be as under:\na. To measure Distribution Licensee-wise Ul (Unscheduled Interchange) energy and corresponding average frequency during 15 minute block.\nb. The Distribution Licensee wise summation of kWh, kW, PF, demand, scheduled interchange/ unscheduled interchange will be done at the main computer station provided at central billing station or at Load Despatch Centre.\nc. For this purpose, the various parameters shall be integrated at one centrally located station preferably at State Load Despatch Centre at Patna through computer and suitable software.\nii. Static tri-vector meters to be provided on LV secondary side of all EHV transformers. The function/duty of this meter will be as under:\na. Measurement of kWh energy supplied to Distribution Licensee for billing purpose.\nb. kW/kVA demand and power factor, 15 minute block-wise as well monthly caused by Discom on each EHV transformer.",
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