Which outcome occurs when a power transformer's internal winding insulation fails at a high-voltage substation?

💡 Explanation

A differential relay trips the circuit breaker as a result of turn-to-turn fault. Because the fault current differs greatly from the input on healthy phases, current differential mechanism activates a trip; therefore the substation protects itself, rather than propagating over-voltage problems.

• Which outcome occurs when a steel I-beam in bridge construction experiences repeated thermal expansion cycles under heavy load?
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