There are various types of faults in power system.

• Short circuit fault

• Open circuit fault

• Ground fault

• Overvoltage fault

• Undervoltage fault

• Overcurrent fault

• Underfrequency fault

• Overfrequency fault

Two types of fault

1) symmetrical fault

2) unsymmetrical fault

Other type fault

1) LG

2) LLG

3) LLLG

4) LLL