Within interconnected three-phase power distribution systems, which outcome initiates when a localized short-circuit current exceeds a circuit breaker's *interrupting rating*?

💡 Explanation

Cascading failures occur because *fault current backfeed* now exceeds downstream breaker ratings; therefore breakers trip sequentially, rather than voltage sagging system-wide under heavy inductive loads or harmonic disturbances being generated during nonlinear load conditions.

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