Research on Reliability of Residual Current Operated Protective Device

According to the fact that the residual current operated protective device used in China's low-voltage power grid is low rate of commissioning, rejecting the action frequently, and the operation rate is low, and the operation characteristics of the residual current operated protective device are investigated. It is found that the traditional protection device cannot eliminate the interference of higher harmonics in the power grid. The number of intelligent electrical equipment increases, and the malfunction of the protection device caused by the inrush current of the switching power supply frequently occurs. Based on this, the wavelet transform is used to realize the accurate detection of the electric shock signal. At the same time, the soft start circuit design of the switching power supply achieves a good suppression effect on the inrush current generated at the moment of starting, and realizes the rapid identification of the electric shock current and the interference current in the future. Effective separation provides theoretical support for the development of high-reliability residual current action protection devices.