The Design of On-site PD Test Circuit for High-Voltage Reactor Based on the Series Resonant Theory

The on-site PD testing of high-voltage reactor is necessary to impose its rated voltage. Owing to the size and weight of the ordinary frequency test equipment, its transportation, installation and adjustment is very difficult. The series resonant test device can be used as an effective solution. In this paper, a PD test circuit of high-voltage reactor based on the series resonant theory is designed. First, the frequency-dependent impedance (30-300 Hz) of the high-voltage reactor is calculated by the finite element analysis software. By the comparing of the calculated results with the testing results, this method has been proved to be correct. According to the results, the appropriate parameters of resonant capacitor and compensation capacitor can be identified; then the sensitivity analysis model is established, and the sensitivity of the circuits is calculated by means of the network method to optimize the parameters of high-voltage filter and the detect impedance. Finally, examples are given to verify the method presented in the text, which provides an important basis for the circuit design and parameter determination of high-voltage reactor´s PD test.