Protection Relays free essay sample

NOTE SUB: Distance Relay for 110kv Line-I In our 110kv Line-I we have Enertec-schlumberger, France make Back-up Distance relay (21-81) for line protection and it was kept out of service from 17. 09. 02 onwards. Because it was malfunctioned in four/five event for unrelated fault in the Grid. There is an another Distance relay in the same line is called Main Distance relay(21-M1) which is in service. But this relay also was not operated in recent fault. Any way it is to be checked during Annual shut down. Now servicing of 21-81 relay is not possible since the company was closed. In our past experience this make of relays slowly gives rouble and same we are replacing one by one. For Line-2 already we have replaced by New ABB make, RAZOA relay (ref. P. o. N0. TCP/PP/SPRS/443 dt. 31. 01. 01) the place of Main Distance Relay (21-M2). At present in Line-I there is no sensitive relay to detect Earth Fault, only Back-up to distance Protection is available(Directional O/C EIF relay) . We will write a custom essay sample on Protection Relays or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page This relay will operate for the all zone fault in the line. So it is decided to procure new distance relay in the place of 21-81 and MPR has been raised for the RAZOA, ABB make (MPR NO. 2973 dt. 26/09/03). you are kindly requested to give an approval to procure the relay as per MPR . [pic]