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Neutral Current

In a balanced star connected network, what is the sum of the three phase currents at the neutral point?
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Answer & Explanation
Correct AnswerB. Zero

Quick Explanation

Three equal sinusoidal currents displaced by 120° have a phasor sum of zero. Therefore a perfectly balanced star load carries zero neutral current.

Formula / Key Relation

IR + IY + IB = 0
Neutral Current explanatory diagram

Detailed Explanation

Correct Answer

B — Zero

Explanation

Three equal sinusoidal currents displaced by 120° have a phasor sum of zero. Therefore a perfectly balanced star load carries zero neutral current.

Key Concept

Neutral Current

Formula

IR + IY + IB = 0

Exam Point

Balanced 3-phase star → neutral current = 0.

Quick Trick

Balanced 3-phase star → neutral current = 0.

Exam Tip

Balanced 3-phase star → neutral current = 0.

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