Discussion on Multi-Dimensional Diagnostic Technology Based on Fault of On-load Tap-changer

Abstract

Abstract On-load tap-changer is widely used in current power systems. Its main function is to change the position of the transformer winding tap-connect when operating under transformer excitation or load. The on-load tap-changer is in the process of changing taps. In the middle, the resistor must be used to achieve the transition to limit the circulation during its transition. The structure of the on-load tap-changer can be divided into three parts, namely the switch, the tap selector and the operating mechanism. The complexity of the mechanism causes frequent failures of the on-load tap-changer. Through the analysis of the causes of multiple faults occurring on the on-load tap-changer of the transformer, the abnormal physical information of the on-load tap-changer before the fault occurs is discussed. A joint detection technique based on vibro-acoustic fingerprint and driving motor current (acoustic and electric) is proposed.