Charges Preventive And Breakdown Maintenance Of Protection System Of 11Kv, 6.6Kv, Gcb, Dg-1 And 2 And 415V Switchgear, Grp, Bts, Davr, Wwsb Lrsb Aphsb And Mov Etc Respect Of Btg And Bop Area Preventive And Breakdown Maintenance Works In Respect Of Btg Bop Area In Nctppiii