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 Y is?
(a) (ZRY)/(ZRY+ZBY+ZBR)
(b) (ZBY)/(ZRY+ZBY+ZBR)
(c) (ZRYZBY)/(ZRY+ZBY+ZBR)
(d) (ZRYZBR)/(ZRY+ZBY+ZBR)
I had been asked this question in an internship interview.
Question is taken from Star to Delta and Delta to Star Transformation in portion Polyphase Circuits of Network Theory
Select the correct answer from above options
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