What instrument is used to measure insulation resistance of High Voltage cables and machinery?
Direct Answer
Option B: High Voltage Megohmmeter (Megger - 2.5 kV or 5 kV DC test voltage)
Insulation resistance testing for HV equipment requires high DC voltages, typically 2.5 kV or 5 kV, to accurately stress the dielectric material. A standard low-voltage multimeter is insufficient and dangerous; a specialized HV Megohmmeter is necessary to detect insulation degradation before it leads to a catastrophic breakdown.
All Options
Detailed Explanation & Context
Insulation resistance testing for HV equipment requires high DC voltages, typically 2.5 kV or 5 kV, to accurately stress the dielectric material. A standard low-voltage multimeter is insufficient and dangerous; a specialized HV Megohmmeter is necessary to detect insulation degradation before it leads to a catastrophic breakdown.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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