THE ZERO-FLUX CURRENT TRANSFORMER TO IMPROVING ACCURACY WITH APPLICATIONS FOR DISTORTED WAVEFORMS AND DC BIAS

Franco Castelli

Abstract

Current measurements on electrical power systems very often concern nonsinusoidal conditions, due to the presence of distorting loads connected to the network (typically because of the presence of power electronic components) and the consequent harmonic pollution. In addition the presence of DC components, superimposed to alternating ones can make it impossible to correctly use the current transformers (CT’s) and gives rise to the burden and composed (namely due to the distorted waveforms) errors, that are arising from the presence of the core flux in CT. Moreover saturation, hysteresis, and polarization are supported by the core flux. The presence of the core flux is the difference between a real CT and an ideal one.

Keywords

ampere-turns, burden and composed error, core flux

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IMEKO-TC7-2004-019.pdf

DOI

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IMEKO TC

TC7 - Measurement Science

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