Analysis and Algorithm Optimization of The Malfunction of Capacitor Overvoltage Protection

In view of the malfunction of capacitor overvoltage protection in substation, the whole process of capacitor overvoltage protection tripping is restored through the action recording of protection device. On this basis, the causes of the protection malfunction are analyzed and the optimization method is proposed. Research shows that under the existing over-voltage protection algorithm, the voltage transformer may cause the capacitor over-voltage protection malfunction when the fundamental frequency ferromagnetic resonance occurs, and the optimized algorithm can effectively avoid the occurrence of malfunction. Finally, the optimization method is applied to the capacitor protection device, and the effectiveness and practicability of the optimization method are verified by playback of on-site recording, which improves the reliability of capacitor overvoltage protection action under the condition of fundamental frequency ferromagnetic resonance of voltage transformer.