Is it advisable to replace ferraris based meters with electronic meters? The permanence of the electromechanical meters currently in use is often justified on the grounds of their long working life and low price. However, it is well known that they are highly sensitive to external conditions and that many factors can lead to miscalibration. This work attempts to clarify some key points in order to answer the previous question. It reviews the operating principles of energy meters. The behavior of watt-hour meters under nonsinusoidal conditions is also studied. The disturbances considered were harmonics, unbalance and main frequency variations.

Evaluation of Energy Meters’ Accuracy Based on a Power Quality Test Platform

Challenges in Electrical Power Measurements Of Adjustable Speed Drives and Motors

A three-phase energy standard has been built at NIM with uncertainty of 30 parts in 10/sup 6/. The system and its uncertainty are reported.

A three-phase energy standard at NIM

This paper describes a study of single-phase-series-parallel versus polyphase calibration of electricity meters. Historically there has been some debate regarding the field performance of electromechanical electricity meters that have been calibrated using the series-parallel technique which is common in North America and other areas. A methodology was carefully established that would allow several meter testing laboratories to be verified and traceable to each other. Meters were tested and the data is presented along with data analysis and conclusions.

J. Braun

Papers

Series-parallel versus true polyphase calibration of electricity meters