Thursday, September 15, 2011

Difficulties in Busbar Protection

Feeder and Busbar protection (Part5)  
       The various difficulties in the busbar protection are,
1. Current levels for different circuits are different.
2. Large number of circuits to be protected.
3. Saturation of cores of current transformer due to d.c. component in short circuit current is possible which produces ratio error.
4. Due to various bus sections, the scheme becomes complicated.
5. With large load changes, relay settings need to be changed.

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