What is the function of a Current Transformer (CT) in HV switchgear?
Direct Answer
Option D: Step down high primary currents (e.g. 1000A) to standard low secondary currents (1A or 5A) for relays
Current Transformers (CTs) provide a safe, proportional secondary current (1A or 5A) derived from high primary currents. This allows protection relays and ammeters to monitor the system accurately without being exposed to the full primary current, ensuring reliable fault detection and system monitoring in high-voltage marine electrical installations.
All Options
Detailed Explanation & Context
Current Transformers (CTs) provide a safe, proportional secondary current (1A or 5A) derived from high primary currents. This allows protection relays and ammeters to monitor the system accurately without being exposed to the full primary current, ensuring reliable fault detection and system monitoring in high-voltage marine electrical installations.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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