Supply, Installation, Testing And Commissioning Of New 400Kv, 63Ka For 1 Sec, 3150A. Circuit Breakers (Outdoor Sf6 Type) Without Pir Along With Support Structure & Accessories Etc. And Dismantling Of Old/Outlived 400Kv Circuit Breakers At 400Kv Bamnauli And Bawana Substation. (EXPIRED)