Testing of HV EHV metering system

Testing of HV / EHV metering system

Electricity supply to middle and high end consumers and open access licensees is provided by a utility at a high voltage using extra high voltage systems. Similar systems are deployed at interface points between utilities. The system for measurement of electricity consumption and demand for billing purpose consist of three voltage transformers, three current transformers and multi-function energy meters.

Utility engineers normally face a challenge: increasing consumer satisfaction while ensuring revenue protection and completeness. This requires accurate measurement of energy transmitted and used, which requires reliable and accurate metering at all times.  A utility could have installed the best possible metering infrastructure but the ratio and phase error of CT & VT, providing input to meters affect the accuracy of energy measurement. These errors may change with time due to various influences and stresses. As a result it is important to find agencies who can test these metering system components on-site.

You may also like to read “need for testing of instrument transformers’

YMPL provides onsite testing services for the components of a metering system.

Ratio and phase errors of voltage and current transformers (as per IS 3156, IS 2705, IS 16227 series and IEC 61869 series) are measured using primary injection method or secondary injection method. Electricity meters are tested using portable electronic meter testing systems.

Key features

  • Testing of HV / EHV metering systems up to 132 kV and up to 2500 A
  • NABL accredited test certificate
  • Use of automated test systems eliminating manipulation
  • Custom built mobile laboratory that can get to remote areas
  • Individual instrument error report
  • Combined metering system error report
  • Connected burden measurement
  • CT/ VT errors at connected burden
  • Installation and wiring audit report
  • Quick turnaround time