Abstract
The watt hour metering system includes watt hour meter, voltage and current transformer, errors of them will affect the overall error of metering system. Considering harmonic, this paper studies the measurement accuracy of metering system, the harmonic equivalent circuits of energy meter, voltage and current transformer are established, their harmonic measurement errors and influencing factors are analyzed, the model of whole metering system is bulit and its measurement errors are anylyzed. Through the simulation of a specific watt hour metering system, the influence of harmonics on it is studied.
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