Feeder Protection Scheme Flashcards
1
Q
What are the feeder protections
A
Over current, earth fault, SEF
2
Q
Principle of Differential protection
A
Net current in CTs is 0, protected zone assumed healthy. Not zero, it will operate.
3
Q
Principle of PWP
A
Instantaneous protection that acts as differential relay
4
Q
Principle of Guard Relay
A
Supervises PWP to avoid CB trip due to fault in Pilot Cable
5
Q
Examples of Differential Protections
A
Differential relay in TR
PWP
REF
BB discrimination zone
6
Q
What kind of protection is Checkzone in BMP station?
A
Over current instantaneous protection
