Measurement Method of Capacitance Value and Dielectric Loss Angle Based on Transient State of Capacitor Switching

Power capacitors are widely used in power system as reactive power compensation equipment. However, due to the complex working environment of capacitors, all kinds of early faults may threaten the normal operation of power system. The changes in the capacitance value and dielectric loss angle of power capacitors can reflect these faults in time. Therefore, accurate capacitance value and dielectric loss angle are of great significance to maintain the safe operation of power capacitors. In this paper, the accurate capacitance value and dielectric loss angle are calculated based on the transient waveform generated by the capacitor switching under the premise of considering the error of the transformer. Finally, simulation experiments verify the rationality and accuracy of the above analysis. The research in this article can provide references for subsequent online monitoring and health evaluation of power capacitors.