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← TechnologyWhich consequence results when a surge arrester fails during a lightning strike on an electrical substation?
A)Isolator switch contacts weld shut
B)Transformer core saturation increases rapidly
C)Circuit-breaker trips inappropriately and locks
D)Busbar insulation experiences flashover arcing✓
💡 Explanation
Flashover arcing occurs because the failed surge arrester cannot divert the high-voltage surge, therefore voltage exceeds the busbar insulation's dielectric strength causing uncontrolled arcing, rather than the circuit-breaker tripping (which needs overcurrent).
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