Practical online detection of internal winding faults of EHV shunt reactors based on impulse frequency response analysis

Internal winding faults of extra-high voltage (EHV) shunt reactors could be a serious threaten to the normal operation of power grid. Initial winding faults could develop into catastrophic failure, resulting in sudden outage of equipment and significant economic losses. It is necessary to implement online detection method to evaluate the status of properties. This paper proposed a practical method for online detecting the internal winding faults of EHV shunt reactors; it is based on impulse frequency response analysis. The basic principle and the detection devices of the method were introduced, respectively. Then the original frequency response curves of EHV shunt reactors were obtained through field online tests, at last, the offline winding fault simulation test was carried out to further investigate the proposed method. This paper is a contribution for the application of impulse frequency response analysis on high voltage equipment.