Up-Gradation / Supply, Replacement And Etc Work Of New Numerical Relay In-Place Of Alstom Make Old Electromagnetic Type Protection Relays In 6.6Kv Ht Switchgear At Unit 1, Cw Swgr, Ahp And Chp Swgr Stg.-I, Sstps, Suratgarh Tn-Mm-2118-Numerical Relays