When the 3-phase system is not grounded and if Single Line to Ground fault occurs, the voltage of the other two healthy phases will____________?
Correct answer: A. Increases
- A. Increases
- B. Decreases
- C. Remains unaffected
Explanation
In an ungrounded system, a single line-to-ground fault shifts the neutral potential. The two healthy phase-to-ground voltages rise to approximately the line voltage, or √3 times their normal value.
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