What risk occurs if an HV circuit breaker is closed into a solid phase-to-phase short circuit fault?
Direct Answer
Option A: Massive fault current flows; instantaneous overcurrent relays must trip breaker within cycles
Closing a breaker into a short circuit subjects the system to massive fault currents. Instantaneous overcurrent relays are designed to detect these extreme levels and trip the breaker within milliseconds to prevent catastrophic damage to the switchboard and generator. This rapid protection is a fundamental requirement for marine HV safety and switchgear design.
All Options
Detailed Explanation & Context
Closing a breaker into a short circuit subjects the system to massive fault currents. Instantaneous overcurrent relays are designed to detect these extreme levels and trip the breaker within milliseconds to prevent catastrophic damage to the switchboard and generator. This rapid protection is a fundamental requirement for marine HV safety and switchgear design.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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