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October 11, 2012

What is Electrical Fault? Write down the causes & classification of fault.

A fault in an electrical equipment is defined as a defect in its electrical circuit due to which the current is diverted to the un-intended path.

Generally caused by breaking of conductors or failure of insulation
Other causes:
• Mechanical failure
• Accidents
• Excessive stresses

Fault Classification:
  • Open circuit - most common fault
  • Single line to ground fault - most common fault
  • Line to line fault
  • Double line to ground fault
  • Three phase fault – Dead short circuit
  • Three phase to ground fault – Rare fault
* Faults cannot be eliminated but can be minimized

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