Abstract
Accurately measuring capacitive current for the automatic tuning arc-suppression coil is the premise and basis of its compensating and arc-extinguishing functions. Several principles of capacitive current measurement applied widely are analyzed and compared. The resonance method to measure the capacitive current has high precision, but has complex tuning. The displacement voltage method has simple tuning, but has poor accuracy of measuring capacitive current. The measurement accuracy of the impedance triangle method and the E0 measurement method lies between the resonance method and the displacement voltage method. And its tuning is also relatively simple, but its measurement and control system is more complex. At last, how to choose appropriate capacitive current measurement method according to the arc-suppression coil tuning principle and the distribution network operation is pointed out.
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