Particle-initiated corona and breakdown in GITL systems

The authors discuss corona and breakdown in compressed sulfur hexafluoride (SF/sub 6/) gas-insulated transmission line (GITL) equipment due to free conducting particles. For particle-contaminated conditions, dynamic models of particle movement and particle-initiated corona and breakdown have been developed. Moreover, a method is proposed to utilize externally measured quantities (for example, time to first corona, corona magnitude, and repetition frequency) during testing and commissioning for identifying the size of contaminating particles.<
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