Replacement Of Existing Defective 400Kv Abb Make Circuit Breaker (Type: Ltb420E2, Operating Mechanism Msd2, Bearing S.No. 45000010) With New 400Kv Cgl Make Circuit Breaker In 417Bay (Tie Bay Of 400Kv Hnpcl-1 Feeder And 315Mva Ict-1) At 400Kv Ss, Guddigudem.