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.
For new installations of 500-kV gas insulated switchgear (GIS) at the Pin Hook, TN USA 500-kV Substation and the Maury, TN USA 500-kV Substation, the Tennessee Valley Authority (TVA) chose to install an advanced SF 6 gas monitoring system (GMS). This paper will discuss specifics of the GMS and how its use simplifies identification of leaking sections, facilitates planned outages for repair or replacement, and ultimately increases the availability and reliability of the equipment.
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