Replacement of 3 Nos. age old problematic 220KV Circuit Breakers pertains to 1 ) 220/ 132KV 160MVA PTR- 2 HV ( ABB ) 2 ) 220/ 132KV 160MVA PTR- 3 HV ( ABB ) and 3 ) 220KV Manubolu- 2 feeder ( ALSTOM ) ( Spring Mechanism ) with new 220kV Siemens Make Circuit Breakers at 220KV SS Nellore under PSDF Phase- II scheme