Abstract
The signal injection method to measure capacitive current in the distribution network faces the problems of frequency selection and measuring precision. In this paper, the method of high frequency signal injection is analyzed and improved. The leakage inductance value of voltage transformer (TV) is obtained by injecting 5000 Hz high frequency signals, and the resonance frequency of the grounding capacitance in the distribution network is determined through the sweeping frequency method. The grounding capacitance can be calculated, and the improved series capacitor method is used to reduce the total capacitance of the experimental system, which can accurately measure the capacitance current. Finally, the experiments have been set up and verified to prove the practical feasibility of the proposed method.
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