HV Exit Exam • Set 5 Question 3 of 30
The secondary winding of an energized Current Transformer (CT) must never be _______ while the primary is carrying current.
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Direct Answer
Option B: Open-circuited
Open-circuiting an energized CT secondary removes opposing secondary flux, causing the core to saturate and inducing dangerously high peak voltages (thousands of volts) across the open terminals.
All Options
A
Earthed
B
Open-circuited
(Correct Answer)
C
Short-circuited
D
Connected to an ammeter
Detailed Explanation & Context
Open-circuiting an energized CT secondary removes opposing secondary flux, causing the core to saturate and inducing dangerously high peak voltages (thousands of volts) across the open terminals.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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