What hazard is associated with opening the secondary circuit of an energized Current Transformer (CT)?
Direct Answer
Option B: Extremely high induced open-circuit voltage causing lethal electric shock and explosive CT failure
Current Transformers (CTs) operate on the principle of magnetic flux balance. Opening the secondary circuit while the primary is energized removes the counter-magnetomotive force, causing the core to saturate. This induces dangerously high voltages across the open terminals, risking lethal electric shock and catastrophic insulation failure of the CT.
All Options
Detailed Explanation & Context
Current Transformers (CTs) operate on the principle of magnetic flux balance. Opening the secondary circuit while the primary is energized removes the counter-magnetomotive force, causing the core to saturate. This induces dangerously high voltages across the open terminals, risking lethal electric shock and catastrophic insulation failure of the CT.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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