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Saturday, January 17, 2015

Which of the following equations is valid for a 3-phase 4-wire balanced star-connected load?

Which of the following equations is valid for a 3-phase 4-wire balanced star-connected load?

(a) IR + IY + IR = IN = O
(b) IN + IY – IB = IN
(c) IR – IY + IB = IN
(d) VB + VR + VY ⁄ Z =N


Answer: IR + IY + IR = IN = O

Balanced  circuit means the magnitude of each phase current is equal and neutral current is zero.

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