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Effect of Reversing Phase Sequence

What happens when the phase sequence of a 3-phase load is reversed?
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Answer & Explanation
Correct AnswerB. Phase currents change in phase angle but not in magnitude.

Quick Explanation

For a balanced symmetrical load, reversing phase sequence changes the order/phase relation of the three phase quantities but not their magnitudes. Consequently the phase-current angles reverse sequence while magnitudes and total real power remain unchanged.

Effect of Reversing Phase Sequence explanatory diagram

Detailed Explanation

Correct Answer

B — Phase currents change in phase angle but not in magnitude.

Explanation

For a balanced symmetrical load, reversing phase sequence changes the order/phase relation of the three phase quantities but not their magnitudes. Consequently the phase-current angles reverse sequence while magnitudes and total real power remain unchanged.

Key Concept

Effect of Reversing Phase Sequence

Exam Point

Reverse sequence changes rotation/angle order, not balanced magnitudes.

Quick Trick

Reverse sequence changes rotation/angle order, not balanced magnitudes.

Exam Tip

Reverse sequence changes rotation/angle order, not balanced magnitudes.

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