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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