Compare : Symmetrical Faults & Unsymmetrical Faults

In this article, the comparison between Symmetrical Fault and Unsymmetrical Fault is given.

Symmetrical Fault – Unsymmetrical Fault

Symmetrical fault

  • A fault which gives rise to symmetrical fault current is called as symmetrical fault. 
  • Equal fault current with 120 degree displacement. 
  • Three phase lines are simultaneously short circuited or three phase to ground fault is an example of symmetrical fault. 
  • Only one phase is considered for calculation, condition for remaining two phases are remains same. 
  • Rarely occurs. 
  • The symmetrical fault is rarely occurring and most severe.

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Unsymmetrical fault

  • A fault which gives rise to unsymmetrical fault current is called as unsymmetrical fault. 
  • Magnitude of fault current are different with equal phase displacement.
  • Unsymmetrical faults are ( 1 ) single line to ground fault ( 2 ) Line to line fault ( 3 ) Double line to ground fault
  • Majority of the fault on the power system are unsymmetrical in nature.
  •  The solution of the unsymmetrical fault analysis is done either by ( 1 ) Kirchhoff’s Law or ( 2 ) Symmetrical Fault Analysis.


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