What device is used to safely discharge stored electrical energy in large HV capacitor banks before maintenance?
Direct Answer
Option D: Built-in discharge resistors and portable earthing/shorting probe
Capacitor banks retain dangerous residual charges even after isolation. Built-in discharge resistors provide a passive path for energy dissipation. Before any maintenance, technicians must use a verified earthing and shorting probe to ensure the equipment is at zero potential, strictly adhering to established High Voltage Permit to Work procedures.
All Options
Detailed Explanation & Context
Capacitor banks retain dangerous residual charges even after isolation. Built-in discharge resistors provide a passive path for energy dissipation. Before any maintenance, technicians must use a verified earthing and shorting probe to ensure the equipment is at zero potential, strictly adhering to established High Voltage Permit to Work procedures.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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