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Question

A three-phase short-circuit fault occurs at point F. in the system shown in figure below. The fault current is _____________A.




  1. 878.5

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Solution

The correct option is A 878.5
Let, base MVA = 30 MVA and let 33 kV be the base voltage
XG1=3020×0.15=0.225 p.u.
XG2=3010×0.10=0.30 p.u.

Xtrans=3030×0.05=0.05 p.u.
Zline=(3+j15)×30332=(0.0826+j0.4132)p.u.



Ztotal=0.0826+j0.5918
=0.597582 p.u,

SC MVA=300.5975=50.21 MVA
SC current=50.21×1063×33×103=878.5 A

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