Feeder and Busbar protection (Part1)
The busbar plays an important role in the supply system. The busbar faults are rare but if they occur there can be interruption of supply, considerable damage and loss. Hence busbar protection is must and it must be fast, stable and reliable. The busbar protection needs to protect not only the busbar but the apparatus associated with it such as circuit breakers, isolating switches, instrument transformers etc.
1.1 Busbar Faults
The various busbar faults can be classified as,
1. Failure of insulation due to material deterioration.
2. Failure of circuit breaker.
3. Earth fault due to failure of support insulator.
4. Flashover due to sustained excessive over voltages.
5. Errors in the operation and maintenance of switchgear.
6. Earthquake and mechanical damage.
7. Accidents due to foreign bodies falling across the busbars.
8. Flashover due to heavily polluted insulator.
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