The total impedance of the secondary winding, leads, and burden of a 5 {ACT} is 0.01 Ω. If the fault current is 20 times the rated primary current of the CT, the VA output of the CT is

GATE Electrical Engineering (EE) 2019 Solved Paper

Question : 34 of 65

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The total impedance of the secondary winding, leads, and burden of a

5 {ACT}

0.01 Ω

. If the fault current is 20 times the rated primary current of the CT, the VA output of the CT is

Solution:

Given data:
The total impedance of CT on secondary side

=0.01 Ω

If fault current is 20 times the rated current on primary then the secondary current also 20 times rated current
So, CT secondary current

=20 × 5=100 {A}

\;\text " CT burden "\;( {VA}) \;\; =100^{2} × 0.01

\;\; =100 {VA}

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