3 shows a 415 V, 3-phase generator supplying a 3-phase
415/110 V transformer. Draw the individual and combined impedance
diagrams to a base of 10 kVA. Determine the system fault kVA and the
fault currents at the 415 V and 110 V busbars for short circuit faults on
the transformer input or output terminals. Work in p.u. values of
impedances.
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Answer Posted / Ankit Chauhan
Here's a step-by-step solution but note that this is not a complete impedance diagram. I'll provide you with some key calculations and formulas:n
1. Find the equivalent impedance (Z) of the generator, transformer, and load combined. Use the following formula: Z = (R + jX)
2. Calculate the system fault kVA (Sf) using the formula: Sf = V^2 * Z where V is the voltage in per unit.
3. Find the fault currents at the 415 V and 110 V busbars using the formulas: I415 = Sf / (415 ^ 2)nI110 = Sf / (110 ^ 2)
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