When secondary of a current transformer is open-circuited its iron core will be__________?
Correct answer: A. hot because of heavy iron losses taking place in it due to high flux density
- A. hot because of heavy iron losses taking place in it due to high flux density
- B. hot because primary will carry heavy current
- C. cool as there is no secondary current
- D. none of above will happen
Explanation
Opening a CT secondary removes the opposing secondary ampere-turns, causing the core flux and induced secondary voltage to rise dangerously. The resulting high flux produces excessive iron loss and heating, while the primary current is set by the power system.
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