Catastrophic Breaker Failures Due to Missing Current Zero-Crossings in Highly Shunt- Compensated 500 kV Lines—Point-on-Wave, Reclosing, and Protection Considerations

BC Hydro has experienced five catastrophic failures of relatively new 500 kV sulfur hexafluoride (SF6) breakers on transmission lines since 2012. The paper proposes incremental improvements in the autoreclose supervision logic as countermeasures and advocates for a significant shift in the POW-controlled switching philosophy.

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Author: Fernando Calero, Kenan Hadzimahovic, Mukesh Nagpal, Ralph Barone, Ritwik Chowdhury, Tony Jiao, Tyler Scott

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