Fault tracing method for high voltage electronic current transformer during its performance test based on the FMEA

Electronic current transformer (ECT) is a new type of high-voltage instrument transformer. It constitutes more components than that of the traditional one. To locate the fault accurately and rapidly during its performance tests, this paper proposed a fault tracing method based on the failure modes and effects analysis (FMEA). From the measuring results of the ECT under test, together with its failure patterns and the test types, we can easily locate its fault in the FMEA tables, and repair them quickly. The presented method is verified to be useful in the results of the analysis on two practical examples.