Relays for Transmission & Distribution Lines protection:

No Line Protection
1 400 KV Transmission Line Main-I: Non switched or Numerical Distance Scheme
Main-II: Non switched or Numerical Distance Scheme
2 220 KV Transmission Line Main-I : Non switched distance scheme (Fed from Bus PTs)
Main-II: Switched distance scheme (Fed from line CVTs) With a changeover facility from bus PT to line CVT and vice-versa
3 132 KV Transmission Line Main Protection: Switched distance scheme (fed from bus PT).
Backup Protection: 3 Nos. directional IDMT O/L Relays and
1 No. Directional IDMT E/L relay.
4 33 KV Lines Non-directional IDMT 3 Over Current and 1 Earth Fault relays
5 11KV Line Non-directional IDMT 2 Over Current and 1 Earth Fault relays

By saeed