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If a resistor ZR is connected between R and N, ZBR between R and B, ZRY between R and Y and ZBY between B and Y form a delta connection, then after transformation to star, the impedance at B is?

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If a resistor ZR is connected between R and N, ZBR between R and B, ZRY between R and Y and ZBY between B and Y form a delta connection, then after transformation to star, the impedance at B is?

(a) (ZBRZBY)/(ZRY+ZBY+ZBR)

(b) (ZRYZBY)/(ZRY+ZBY+ZBR)

(c) (ZBY)/(ZRY+ZBY+ZBR)

(d) (ZBR)/(ZRY+ZBY+ZBR)

The question was posed to me during an online interview.

Asked question is from Star to Delta and Delta to Star Transformation in section Polyphase Circuits of Network Theory

1 Answer

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Right answer is (a) (ZBRZBY)/(ZRY+ZBY+ZBR)

Easy explanation: After transformation to star, the impedance at Y is

(ZBRZBY)/(ZRY+ZBY+ZBR).

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