procurement of 33 kv protection ct / pt combined for 7 mva transformer protections along with supervision of erection and commissioning at switchyard , outdoor oil cooled ct / pt combined unit , 33kv outdoor oil cooled ctpt combined unit 50hz. three phase six bushing type with three no. ct and one no. three phase vt with hv neutral brought out and earthed ilv 36 / 70 / 170 kvp ins class a. ct specification: ratio 200-100 / 1-1-1a. core 1: class 0.5 burden 15va, core 2: class 5p20 burden 15va, core 3: class ps vk=>200v, ohms @ 100a tap & rct<=9 ohms @ 200a tap. stc 25 ka time:3 sec. vt specification: ratio 33kv / 110v ( phase to phase ) ( 33kv / rt3 / 110v / rt3 ) phase to neutral class 0.5 burden 100va. voltage factor 1.2 continuous / 1.5 for 30 seconds vector group / connection star / star ( ynyn0 ) . drawing no ke-33octpt-01-800 enclosed, terminals brass stud type. primary terminals m25 in size with nut, primary neutral to be solidly earthed. make: kalpa, kapco, mini engineering, technovel, crompton, abb, siemens and andrew yule, along with supervision of erection & commissioning of the same including junction box / marshaling box.