procurement of various protection relays installed in 400kv switchyard of ph-3 and 4 and ht switchgears of ph-4 stps sarni. , purchase of various protection relays m/s ge (t&d) make , distance potection relay micom p444. , distance potection relay micom p443 , distance potection relay micom p442. , transformer protection relay p642 , transformer protection relay p643 , multilin f650 numerical relays , high speed tripping relay mvaj105 , dc supply supervision relay (type mvaam) model no. mvaam11b1cj5516a , trip coil supervision relay (type mvaxm) model no. mvaxm31dice3005a , auxiliary relay (type mvaam) model no. mvaam21d1ba2541a , dc changeover relay (type mvaam) model no. mvaam11b1aa2530a , auxiliary trip relay (type mvaam) model no. mvaam11b1aa9531a , tripping relay (type mvajm) model no. mvajm25la1004a , dc supervision relay (type mvaam) model no. mvaam11b1cj1015a , tripping relay (type mvajm) model no. mvajm11ja1000a