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A symmetrical three-phase, three-wire 440V supply is connected to star-connected load. The impedances in each branch are ZR = (2+j3) Ω, ZY = (1-j2) Ω,

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A symmetrical three-phase, three-wire 440V supply is connected to star-connected load. The impedances in each branch are ZR = (2+j3) Ω, ZY = (1-j2) Ω, ZB = (3+j4) Ω. Find ZBR.

(a) (5.22-j0.82) Ω

(b) (-3.02+j8) Ω

(c) (-5.22+j0.82) Ω

(d) (3.8-j0.38) Ω
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Right option is (b) (-3.02+j8) Ω

The explanation: ZBR = (ZRZY + ZYZB + ZBZR)/ZY

= (-3.02+j8) Ω.
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