Which risk increases when high-voltage direct current (HVDC) transmission circuit breaker fails to open during a fault condition?

💡 Explanation

When an HVDC circuit breaker fails to open during a fault, uncontrolled fault current can propagate broadly throughout the power grid because there is no rapid current interruption, leading to further component failures triggered by overcurrents and overvoltages. Therefore cascading failures result, as opposed to other options which relate to stable operating conditions impacting conductor surfaces or connected electrical equipment.

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