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PU Impedance/ Reactance Diagram of a Power System

A 75 MVA, 10 ...

Question

A 75 MVA, 10 kV synchronous generator has $X_{d} = 0.4 p . u$ . The $X_{d}$ value (in p.u) to base of 100 MVA 11 kV is

A

0.578

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B

0.279

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C

0.412

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D

0.44

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Solution

The correct option is D 0.44
$(X_{d})_{n e w} = 0.4 \times (\frac{100}{75}) {(\frac{10}{11})}^{2} = 0.44077$

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