Three Zones of a Single Phase Circuit

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Three zones of a single-phase circuit are identified in the figure attached. The zones are connected by two transformers T1 and T2, whose ratings are also shown in the same figure. Using base values of 20kVA and 115 volts in zone-3 calculate the per-unit impedances. Neglect the transformer winding resistances and the shunt admittance branches.

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Solution

VBase = 115 Volts, VABase = 20,000 VA
ZBase = (VBase)2/ VABase = (115)2/20,000 = 0.66 ...

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