Research on Automatic Detection Method of Concealed Faults in Relay Protection Circuit of Secondary Equipment in Substation
Due to the correlation between the state of the relay protection circuit of secondary equipment and multiple components,it is difficult to achieve the desired effect when detecting its faults.Therefore,this article proposes a research on the automatic detection method for hidden faults in the relay protection circuit of secondary equipment in substations.By considering the interrelationship between different components in the secondary circuit of relay protection,the original fault detection problem is transformed into the calculation of the optimal fitness function of the objective function through the establishment of an appropriate function.The similarity between the actual operation information of the secondary circuit of relay protection and the expected value is used as the metric standard to determine the fault-related domain of the secondary circuit of relay protection.During the detection stage of hidden faults,the optimal value of the fitness function is solved within the constraint range as the final detection result.Test results show that under this detection method,the output value of the fault criterion characteristic value of the circuit is always above 0.12,with the maximum value exceeding 0.22,effectively reflecting the hidden fault status existing in the relay protection circuit of the secondary equipment.