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TVA identified an increasing failure rate of 132-kV (106-kV Maximum Continuous Operating Voltage) porcelain arresters on the 161-kV system. A cross-organizational team was formed to determine the root cause of the 19 arrester failures and provide solutions. The team researched arrester failure modes and solicited input from arrester experts. A root cause diagram is discussed and multiple failure modes...
The Tennessee Valley Authority (TVA) is a wholly-owned corporation of the United States of America formed in 1933 by an Act of Congress. This paper presents an historical overview of the TVA system, a present day and future outlook, and a discussion of future trends in the power industry and their impact on the bulk transmission system.
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...
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 SF6 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,...
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