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220kv line protection has a primary and secondary relay system. What are they?
Primary:PLC (power line carrier)
Secondary: Set of electromechanical relays.
500kv line protection is composed of:
2 or 3 pilot relaying systems
2 direct transfer trip relaying systems
1 set of back up relays
Eash CB in the bulk system is equiped with a C60 relay for__________protection.
Local Breaker Failure Backup (LPFB)
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