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A sustained three phase fault occurs in the power system shown in the figure. The current and voltage phasors during the fault (on a common reference), after the natural transients have died down, are also shown. Where is the fault located?  

A sustained three phase fault occurs in the power system shown in the figure. The current and voltage phasors during the fault (on a common reference), after the natural transients have died down, are also shown. Where is the fault located?   Correct Answer Point Q

Concept :

As shown in the phasor diagram 

  • Current I2 & I4 have phase difference of 180°. So that they cancel out each other.
  • Magnitude of the current I1 is more than current I3. Also I1 is more lagging than I3
  • So that  fault is located at point Q.

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