What is the function of a Potential Transformer (PT) / Voltage Transformer (VT) in HV switchboards?
Direct Answer
Option C: Step down High Voltage (e.g. 6.6 kV) to safe Low Voltage (e.g. 110V) for metering and relays
Voltage Transformers (VTs) are essential for safe instrumentation. They step down high system voltages to standardized, low-voltage levels (e.g., 110V) for metering, protection relays, and synchronization equipment. This isolation protects sensitive electronic devices and personnel from direct exposure to the high-voltage primary circuit during normal shipboard operations.
All Options
Detailed Explanation & Context
Voltage Transformers (VTs) are essential for safe instrumentation. They step down high system voltages to standardized, low-voltage levels (e.g., 110V) for metering, protection relays, and synchronization equipment. This isolation protects sensitive electronic devices and personnel from direct exposure to the high-voltage primary circuit during normal shipboard operations.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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