This paper first analyzes the shortcomings of the traditional distribution network capacitance current measurement method, and then analyzes the widely used method of measuring capacitance current based on the principle of sweep frequency method by injection signal, and points out the problems of this method in actual application. On this basis, this paper proposes the principle of measuring capacitance current based on fixed frequency method. Constant currents of equal amplitudes with different frequencies are injected from the open triangle end of PT, and then the voltage of the open triangle end is measured respectively. The capacitance current value of the distribution network can be obtained by calculation. Through simulation experiments, it is verified that this method of measuring capacitance current by injection signal has good application prospects.
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