Which outcome occurs when large substation arc-fault circuit breaker interrupts high fault current?

💡 Explanation

When interrupting a high fault current, arc-fault circuit breakers rapidly quench the arc using plasma cooling, this causes a large di/dt and resultant inductive kickback voltage because of the substation inductance causing insulation breakdown. Therefor overvoltage results, rather than interference, stress, or welding which depend on alternative discharge parameters.

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