Spl Repairs to HT Air Break Switches, lightning arresters, HT Switch gears, HT UG Cables and connected allied works in 151 Sub Stn Transmitter Sub Stn, Base Ops Sub Stn and nearby areas at AF Stn Carnicobar

Taking out of old UNSV HT Air Break Switch Gang Operated and LT Lightning Arresters of any size and type from 4 pole/3pole/2pole structures.

Taking out of old UNSV conventional type GI earthing and earth plates from LA, 4 pole/3pole/2pole structures.

Taking out of old UNSV HT/LT UG cables any size and type

M&L De-hydration of transformer oil after drain out of old existing oil completely from the transformer and collecting in a container, dehumidfication of transformer oil with the help of heat pump & oil circulating pipes, testing of di-electric strength by using necessary instrument and proving the di-electric strength not less than 40KV in 2.5cm gap complete all as specified and directed at following locations :- (a) 151 Sub Stn @ 1 x 100 KVA transformer (b) Transmitter Sub Stn @ 1 x 400 KVA transformer (c) Base Ops Sub Stn @ 1 x 100 KVA transformer (d) KV Sub Stn under 151 Sub Stn Feeder @ 1 x 100 KVA transformer pole mounted type

M&L for topping up of new transformer oil having di-electric strength not less than 60 KV (On site testing of di-electric strength needs to be carried out in front of Engineer-in-Charge).

Supply and fix in replacement Silica gel alongwith breather assembly of existing size of transformer capacity 100KVA to 400 KVA including minor repair works in breather assembly if required complete all as specified and directed by Engr-in-Charge.

Labour and transportation charges for major overhauling of transformer of capacity 100 KVA to 500 KVA after dismantling of transformer core assembly, lifting up of HT/LT winding and draining out of existing transformer oil, hot oil jet cleaning of all components inside the tank, replacing of wornout or damaged components, rewinding of HT/LT coils complete with suitable gauge of super enamelled copper solid conductor wound in the shape of helical/disc/cylindrical/cross over or as per existing to generate maximum MMF and insulation of winding wrapped with kraft paper/press board etc and measuring IR (Insulation Resistance) value, carrying out turn ratio test at workshop, treating the oil, wrapping cotton insulating taps (insulating materials shall be of class A type to withstand 105 degree celsius temperature), re-assembling of transformer after building core plates and rewinding of coils, testing of copper loss, iron loss, core loss, insulation test of all HT/LT windings, topping up of transformer oil, testing of di-electric strength of transformer oil and achieving upto 40 KV to 60 KV, repairing of tank body, denting/painting of full body after preparation and 2 coats zinc chromite primer + 2 coats anti corrosive synthetic enemel paint over the body by using spary gun and compressor all as specified and as directed by Engineer-in-Charge. Note : The following shall be deemed to be included in quoted rates :- (i) All kind of transportation charge, hydra/lifting vehicle, suitable technician/labour etc from site to Sri Vijaya Puram and back to site complete. (ii) All the materials such as Copper winding wire, insulating papers, core plates, assembling accessories etc shall be measured and paid separately under respective items. (iii) Drain out and filling up of oil includes topping up of addl oil upto conservator level and dehumidification complete.

Supply only highly laminated core plate of thickness 0.27mm to 0.65 mm made up of Conductive Cold Rolled Grain - Oriented Electrical steeel (CRGO) and silicon steel sheets with high magnetic permeability efficient conductivity of magnetic flux, low hysteris loss, reduced eddy current and minimised iron & core loss attached together as thin layers with the shapes of F, I, T, H, L, U and C complete for 100 KVA transformer.

Supply only highly laminated core plate of thickness 0.35mm to 0.80 mm made up of Conductive Cold Rolled Grain - Oriented Electrical steeel (CRGO) and silicon steel sheets with high magnetic permeability efficient conductivity of magnetic flux, low hysteris loss, reduced eddy current and minimised iron & core loss attached together as thin layers with the shapes of F, I, T, H, L, U and C complete for 500 KVA transformer.

Supply only Copper soild conductor highly polished with super enamel varnish and `F' class insulation coated for HT winding (18 Gauge power transmission grade) suitable for capacity 100 KVA transformer