Diagnosis and risk evaluation of hidden fault at voltage and current acquisition section of relay protection equipment based on primary and secondary information fusion

The hidden fault of voltage and current acquisition is the important cause for the incorrect action of the relay protection equipment. Technology research and engineering application on how to effectively extract the characteristic parameter and accurately identify the hidden faults of the relay protection equipment is in the initial stage. According to the actual wiring, loop and configuration of the relay protection equipment, the article constructs a state quantity transmission logic matrix, builds a multi-source information state quantity set based on online data, identifies hidden faults by comparison of homologous data, build fault trees to evaluate the risk of incorrect actions for hidden faults. Practical cases verify the effectiveness of this method.