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← TechnologyWhich outcome occurs when a high-voltage DC transmission line develops a ground fault with limited fault current?
A)Over-voltage leading to cascading insulation failure
B)False triggering of distant circuit breakers
C)Electrolytic corrosion of buried metallic infrastructure✓
D)Harmonic distortion of the AC grid connection
💡 Explanation
When a ground fault occurs in a HVDC system with limited fault current, electrolytic corrosion occurs because the DC current flows to ground through buried metallic structures, causing electrochemical reactions. Therefore corrosion results, rather than over-voltage, breaker trips, or harmonic distortion, which require high fault currents or inductive coupling effects.
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