发电机出口电压互感器匝间短路电流特性及其在线监测研究OA

In response to the demand for warning of interturn short-circuit faults in generator output volt-age transformers(PT),the author studies the relationship between the primary side interturn short-cir-cuit current of PT and the number of short-circuit turns.An online monitoring and warning method for interturn short-circuit faults based on the primary side short-circuit current is proposed.Firstly,the current variation mechanism during PT interturn short-circuit was theoretically analyzed.Subsequently,PT test models with different short-circuit turns ratios were developed for experimentation,and the influ-ence of factors such as short-circuit turns ratio and external voltage on the primary current was obtained.An online monitoring method for PT interturn short-circuit faults based on primary current was estab-lished,and the measured results showed that the method could achieve a diagnostic accuracy of 0.01％for short-circuit turns ratio.We have developed an online monitoring system for PT interturn short-cir-cuit faults at the generator outlet based on a single current.The effectiveness of the system has been veri-fied through practical diagnosis on the generator outlet PT cabinet simulation test platform.This study can provide reference for monitoring and early warning of PT interturn short-circuit faults at the generator outlet,avoiding unplanned shutdowns of the generator set.