AC power & energy standard — NPLI measurement, calibration & testing

Abstract

AC power & energy standard of National Physical Laboratory, India (NPLI) is responsible for maintenance of national measurement standard of ac power & energy and international traceability through intercomparisons. It serves as the basis for dissemination of traceability in measurement through high level calibration and measurement services to the various user organizations in the country. It also supports and helps the industries in improving the measurement assurance systems through interlaboratory proficiency testing (PT) program and in solving actual field problems. Power measurement at zero power factors using zero power factor standards is described as it is used in intercomparison. The performance of energy meters under the various influence quantities is described as a service to the industries.

State of the Art on High Voltage Metrology: Past, Present and Future

“…The relay opens and closes an electric circuit either electronically or electromechanically. To protect transmission lines, directional relays are used where the power flow is related to a specific direction [26]. Directional relays play a vital role in distribution grids [22,23].…”

“…Regular calibration of high voltage measuring systems is an essential need of many governmental, educational, and private sector industries to ensure accurate electricity standards and enable robust measurements. Besides, traceability of measurement results to a higher standard with specified uncertainties is essential to confirm the consistency of measurement results [26].…”