bids are invited for trfr, current, 400-800-1600a, 1-1-1-1-1a-trfr,current,400-800-1600a,1-1-1-1-1a , type of insulation: class-a, application: outdoor, burden: 20va hermetically sealed, outdoor, oil cooled, single phase, wound primary type, five core, live tank, current transformer with porcelain insulators having a creepage distance of 25 mm/kv i. e 3625 mm (min.) . (a) ct ratio core: c1: 400-800-1600/1a c2: 400-800-1600/1a c3: 400-800-1600/1a c4: 400-800-1600/1a c5: 400-800-1600/1a (b) rated burden @ highest tap: c1: -- c2: -- c3: 10va c4: 20va c5: -- (c) class accuracy: c1 – ps c2 – ps c3 – 0.5 c4 – 5p c5 – ps (d) isf/alf: c1: --- c2: -- c3: <5 c4: 20 c5: -- (e)min knee point voltage (vk) : c1: 470/940/1880v c2: 470/940/1880v c3: -- c4: -- c5: 416/832/1664v (f)rct at 75 °c: c1: 2/8/16 ohm c2: 2/8/16 ohm c3: -- c4: -- c5: 3/12/24 ohm (g)iext at vk/2@ 400a: c1: 30 ma c2: 30 ma c3: --- c4: --- c5: 30 ma (h)frequency: 50 hz (i)rated dynamic current: 100ka, (j)rated cont. thermal current: 120% of the rated primary current, (k)rated stc: 40 ka for 3 seconds, (l)system voltage: 132 kv, effectively earthed system & highest system voltage: 145kv (m)insulation level kv/kvp:275/650kv (n)applicable standard: is 2705 / 1992 (o)acceptable partial discharge level: less than 10 pc at 1.1um/√3 (p)maximum radio interference voltage at 1.1 times the maximum rated voltage: less than 1000 micro volts. (q)dielectric dissipation factor (tan-delta): less than 0.005 at um/√3 note: ct supplied are to be similar in all respect vide ct. manufacturing year-2010 manufacturer : mehru electrical & mechanical engineers(p)ltd , serial no : oc 2912/1/21/10 total quantity : 15