Harmonic wave measuring and correcting method for capacitor voltage transformer through transformation ratio fitting
A voltage transformer, measurement and correction technology, applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve the problems of not involving quantitative analysis and calculation methods, not providing capacitive voltage transformer correction methods, and lack of measurement error analysis, etc.
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[0040] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings and embodiments.
[0041] The present invention applies equal voltage values of different frequencies to the primary side of the capacitive voltage transformer adopting the fast saturation type damper, and the ratio of the measurement result of the secondary side to the voltage applied on the primary side is the actual transformation ratio of the capacitive voltage transformer. The fitting function of the variable ratio frequency response characteristic curve is obtained by polynomial fitting and fractional fitting. According to the equivalent circuit parameters of the capacitive voltage transformer, the frequency of each resonance point is obtained, and the actual transformation ratio value at the resonance frequency is obtained by using the voltage division formula. According to the resonant frequency and the actual transformation ratio,...
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