Q. Explain the causes for faults.
Q. State the causes of fault.
Q. State the causes of fault.
- Mostly the faults are caused by failure of insulation. The failure of insulation results in short circuits which are very harmful.
- Faults are also caused by breaking of conductors due to excessive heat or mechanical stresses.
- Most of the faults on Transmission lines and distribution liens are caused by over voltages due to lightening or switching surges, conducting object falling on overhead lines.
- Unbalance currents flowing in rotating machines set up harmonics, there by heating the machines.
- Certain faults occur due to the poor quality of system components or because of faulty system design.
- Sometimes circuit breakers may trip due to errors in the switching operations testing or maintenance work, wrong connections defects in protective devices.
- Other causes of faults on overhead lines are : lightening strokes, air crafts, ice and snow loading, abnormal loading, storms, earthquakes, creepers etc.