सीएसआईआर-राष्ट्रीय भौतिक प्रयोगशाला
CSIR-National Physical Laboratory
AC Power & Energy Metrology
The AC power & Energy Metrology section of CSIR-National Physical laboratory is responsible to maintain national standard of ac power and energy and disseminating traceability through calibration services (discussed below) to the government bodies, power sectors, meter manufactures and end users at par with world leading National Metrology Institutes (NMIs). Energy meter plays crucial role in monitoring, control and management of flow of energy. Testing of energy is essential right from its designing stage to the installation at the field. The laboratory also provides apex level testing facility to the industries for all types of energy meters including DLMS/ Smart Energy Meters.
CSIR-NPL is the member of DLMS User Associations.( https://www.dlms.com/member-profile/?id=CSIR-National-Physical-Laboratory_994 )
Calibration Service: CSIR-NPL provides apex level calibration services for power and energy measurements. And disseminate measurement traceability for Power & Energy parameters throughout the country. The methods and procedure used in the measurements are internationally recognized at par with other leading NMIs. The laboratory also periodically validates its own measurement capabilities and operation procedures by participating in international comparison. The scope of measurement is discussed below:
| Parameter | Range | Expanded Uncertainty (k=2) | |
|---|---|---|---|
| Single Phase | Three Phase | ||
| Active Power | 10 V to 576 V 10 mA to 120 A PF: 0.01 (lag/lead) to 1.0 |
50 to 70 µW/VA (40 to 70 Hz) 70 to 300 µW/VA (70 to 400 Hz) |
65 to 150 µW/VA (40 to 70 Hz) |
| Apparent Power | 10 V to 576 V 10 mA to 120 A 40 to 70 Hz PF: 0.01 (lag/lead) to 1.0 |
80 to 150 µW/VA (40 to 70 Hz) | 80 to 150 µVA/VA (40 to 70 Hz) |
| Reactive Power | 10 V to 576 V 10 mA to 120 A 40 to 70 Hz PF: 0.01 (lag/lead) to 1.0 |
90 to 150 µW/VA (40 to 70 Hz) | 90 to 150 µvar/VA (40 to 70 Hz) |
| Active Energy | 30 V to 576 V 10 mA to 120 A PF: 0.25 (lag/lead) to 1.0 |
50 to 70 µW/VA (40 to 70 Hz) 70 to 300 µW/VA (70 to 400 Hz) |
65 to 150 µWs/VA (40 to 70 Hz) |
| Apparent Energy | 30 V to 576 V 10 mA to 120 A 40 to 70 Hz PF: 0.25 (lag/lead) to 1.0 |
80 to 150 µW/VA (40 to 70 Hz) | 80 to 150 µVAs/VA (40 to 70 Hz) |
| Reactive Energy | 30 V to 576 V 10 mA to 120 A 40 to 70 Hz PF: 0.25 (lag/lead) to 1.0 |
90 to 150 µW/VA (40 to 70 Hz) | 90 to 150 µvars/VA (40 to 70 Hz) |
Testing Services: Energy Meter, kilowatt-hour meter, revenue meter is a device that is used for measurement of electrical energy and keeps the record of consumption of energy by the consumer. Energy meters are important part of Electrical Grid System, which is used for recording, monitoring, controlling and management of energy. Testing of energy is meters is essential to cater various demands of electrical grid The laboratory is engaged in providing testing services for all types of energy meters as per IEC: 62053-21, IEC: 62053-22, IS: 13779, IS-14697, IS: 13010 and CBIP-88. Energy meters include such as single-phase static watt hr meters, three phase static watt hr meters, whole current and CT/PT operated, three phase tri-vector energy meters including DLMS and smart energy meters are to be tested before rolling out to the actual field. The test facilities available at CSIR-NPL and scope of testing is discussed below:
A. Acceptance test as per IS 13779(2020/1999)
| Sr. No. | Test | Clause | Specifications |
| 1 | Test of Insulation Properties | 12.7.6 | a.c. Static Watthour Meters, Class 1 and 2 — Specification Note: All tests are applicable to the single and three phase DLMS and smart energy meters |
| a.c. high voltage test | 12.7.6.3 | ||
| Insulation test | 12.7.6.4 | ||
| 2 | Test of Accuracy Requirements | ||
| Test on limits of error | 11.1 | ||
| Test of meter constant | 12.15 | ||
| Test of starting condition | 12.14 | ||
| Test of no-load condition | 12.13 | ||
| Test of repeatability of error | 12.17 | ||
| Test of influence quantities | |||
| 3 | Test of Electrical Requirement | ||
| Test of power consumption test | 12.7.1 | ||
| Test of influence short- time over currents | 12.7.3 |
B. Acceptance test as per IS 14697(2021/1999)
| Sr. No. | Test | Clause | Specifications |
| 1 | Test of Insulation Properties | 12.7.6 | ac Static Transformer Operated , WATTHOUR AND VAR-HOUR METERS, CLASS 0.2S AND 0.5S-Specification Note: All tests are applicable to DLMS and smart energy meters |
| a.c. high voltage test | 12.7.6.3 | ||
| Insulation test | 12.7.6.4 | ||
| 2 | Test of Accuracy Requirements | ||
| Test on limits of error | 11.1 | ||
| Test of meter constant | 12.14 | ||
| Test of starting condition | 12.13 | ||
| Test of no-load condition | 12.12 | ||
| Test of repeatability of error | 12.16 | ||
| Test of influence quantities | |||
| 3 | Test of Electrical Requirement | ||
| Test of power consumption test | 12.7.1 | ||
| Test of influence short- time over currents | 12.7.3 |
C. Test of influence quantities and Anti tamper Test
| Sr. No. | Test Name | Tests |
| 1 | Test of influence quantities: | Influence of voltage variation, frequency variation, phase sequence, 3rd harmonics and 5th harmonics, voltage unbalance should not affect accuracy class of meter as per standard specifications |
| 2 | Test of influence of AC/DC magnetic inductions | CBIP 325 Guidelines |
| 3 | Tamper and fraud protection Tests | Single Phase Energy Meter and Three Phase Energy Meter as per customer requirements |
D.Test for Data Exchange For Electricity Meter Reading, Tariff And Load Control-Companion Specification(IEC 62056)
| Sr. No. (1) | Compliance Test IS 15959 (part 1 2011)/ IS 15959 (part 2 2016) |
Specifications |
| 1.0 | Conformance to DLMS/COSEM (IEC 62056) | Annexure K-1 (a) of IS 15959 (part 1 2011) Note: Testing will be done on latest CTT Compliance test tool of version 4.x supported DLMS/Smart Energy Meters Note: All tests are applicable to the single and three phase DLMS as well smart energy meters. |
| 2.0 | Parameter verification: such as | |
| SNRM/UA | ||
| Object list download | ||
| Association properties | ||
| Simultaneous operation | ||
| Security: | ||
| Lowest level security secret | ||
| Low level security (LLS) secret | ||
| High level security (HLS) secret | ||
| Instantaneous parameters | ||
| Snap shot of instantaneous parameters | ||
| Scaler profile | ||
| Block load profile PParameters | ||
| Selective access by range for block load profile | ||
| Name plate details | ||
| Programmable parameters | ||
| Event code and event logging: | ||
| Indian event reference table – Voltage related | ||
| Indian event reference table – Current related | ||
| Indian event reference table – Power related | ||
| Indian event reference table – Transaction related | ||
| Indian event reference table – Other | ||
| Indian event reference table – Non roll over | ||
| Indian event reference table – Control | ||
| Selective access by Entry for event log profile |
Mr. J.C Biswas
Chief Scientist & Head
AC Power & Energy Metrology Section
Email: jcbiswas@nplindia.org
Phone: 011-4234-2427
- Atul Suresh Somkuwar
Senior Scientist & Deputy Head
AC Power & Energy Metrology
Email: assomkuwar@nplindia.org
Phone: 011-4234-2427 - Anoop Singh Yadav
Technical Officer
AC Power & Energy Metrology
Email: asyadav47@gmail.com - Prakash Singh
Lab Attendant
AC Power & Energy Metrology
Email: prakashsingh878@gmail.com
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