Transformer inrush mitigation using controlled switching of a 500-kV circuit breaker

Abstract

This paper presents post event analyses of three inrush events that caused relay misoperation. It then presents the results of an EMTP study that illustrates the degree to which different techniques can mitigate the transformer inrush transient and compares this to the predicted performance of closing resistors in an identical application. It demonstrates that controlled switching of a transformer adequately mitigates inrush transients.

Study of UHF Frequency Response Characteristics of the Semicircle Dipole Inner Sensor for Partial Discharge Detection in GIS

“…At the same time, the safe and reliable operation for a long time also become the focus of attention. Studies have shown that [2][3][4], GIS has internal SF6 gas leakage, switch fault, internal discharge hidden trouble. In all kinds of fault, large of the failure caused by the insulation defect [5,6].…”