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Research on the Processing Method of the Influence of Stray Capacitance on CVT Harmonic Measurement

Capacitive voltage transformers (CVTs) are greatly affected by stray capacitance when used for harmonic voltage measurement. By analyzing the variation characteristics of stray capacitance and using the equivalent circuit of CVT, this paper proposes a data mapping based on the mathematical theory of input and output, which can be measured in the possible variation range of stray capacitance. The error tolerance is the optimization condition, and the maximum probability is the mathematical processing method of the optimization target to determine the optimal combination of stray capacitance parameters, so as to realize the harmonic voltage correction measurement, and prove the rationality and effectiveness of the method through the verification analysis of the actual case.