Which hazard arises when a three-phase circuit breaker fails to interrupt a short circuit?

💡 Explanation

When a breaker fails under short circuit, the overcurrent persists because the fault path remains unbroken, potentially overloading other protective devices downstream, inducing cascade failures escalating into system wide blackouts. Therefore, cascading failures result rather than other localized electrical faults/issues, which require successful isolation.

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• Which outcome occurs when reactive power surges in a three-phase power transformer circuit beyond its compensation capabilities?
• Which risk increases significantly when protective CT saturation occurs within high-voltage power transformer differential protection systems?
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