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3 Cards in this Set
- Front
- Back
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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. |
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500kv line protection is composed of: |
2 or 3 pilot relaying systems
2 direct transfer trip relaying systems
1 set of back up relays |
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Eash CB in the bulk system is equiped with a C60 relay for__________protection. |
Local Breaker Failure Backup (LPFB) |
