September 1, 2012

Write short notes on Differential relays.

Differential relays:
The differential relay responds to vector difference between two or more similar quantities. 
- The differential relay has at least two actuating quantities say I1, I2
- The two or more actuating quantities should be similar i.e. current 1 & current 2.
- The relay responds to the vector difference between two i.e. I1 ~ Iwhich includes magnitude and/or phase angle difference.
Differential protection is generally a unit protection. The protected zone is exactly determined by location of CTs. The vector difference is achieved by suitable connection of CT or PT secondaries.


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