SSC JE Electrical Engineering 2014 Set 2 Paper

Question : 164 of 200

Marks: +1, -0

The positive, negative and zero sequence impedances of 3-phase synchronous generator are j 0.5 pu, j 0.3 pu and j 0.2 pu respectively.
When symmetrical fault occurs on the machine terminals. Find the fault current. The generator neutral is grounded through reactance of j 0.1 pu.

– j 3.33 pu
– j 11.67 pu
– j 2.0 pu
– j 2.5 pu

Validate

Solution:

When symmetrical fault occurs on the Machine terminal then only Positive Sequency current will flow.

I_{\fault}=1/{{Z_{PositiveP. U.}+\Ground \Reactance}

I_{\fault}=1/(.SJ +.IJ)=-11.67

P.U.

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