SF6 Circuit Breaker Failures during Shunt Reactor Compensated Line Switching

Jerry X. Wen and Mazana Armstrong analyse catastrophic failures in 550 kV SF6 circuit breakers on shunt reactor-compensated lines at BC Hydro.

by Jerry X. Wen, Mazana Armstrong


Jerry X. Wen and Mazana Armstrong analyse catastrophic failures in 550 kV SF6 circuit breakers on shunt reactor-compensated lines at BC Hydro. High compensation levels induce severe DC offset currents, delaying current zero crossings and preventing successful breaker interruption. The study recommends mitigation via optimized Point-on-Wave controller settings, PIR integration, and composite insulator retrofits, contributing to safer, climate-resilient transmission infrastructure.

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