If the percentage reactance of the system up to the fault point is 20% and the base kVA is 10000, then short-circuit kVA is __________.

Question

Question

This question was previously asked in

HPCL Engineer Electrical 01 Nov 2022 Official Paper

Answer 1

The correct answer is option 2):(50000)

Concept:

Short circuit MVA or Fault MVA = (Base MVA) x 100 / (% X)

Where

X = Thevenin equivalent reactance between fault point and zero power bus (ZPB)

Calculation:

Given that, Base kVA = 10000 Reactance

(Xeq) = 20% = 0.2

Short circuit kVA = 10000/0.2 = 50000 kVA