PROVN OF 500KVA TRANSFORMER AND CONNECTED ITEMS AT FORT AREA, NAGPUR UNDER GE KAMPTEE

Supply, installation, testing and commissioning of transformer outdoor type step down transformer 11kV/0.433 kV AC 3 phase, 50 Hz, 500 kVA capacity, core type copper wound, on HV & LV coil immerse, naturally cooled, oil natural-air natural (ONAN) with external cooling tubes, delta connected on primary side (HV) and star connected on secondary side (LV) in accordance with vector group DYN-II with neutral brought out on secondary side (LV) and having 7 step tapping at +/2.5% of each step (+5% to 10%) on HV side to be charged by means of hand operated OFF load tap change gear, the maximum temperature rise should not exceeds 45 degree celsius in oil and 55 degrees celsius in HV/LV winding when measured by resistance method after continuous full load run on and ambient temp of 40 degree celsius the transformer shall be in accordance with IS-1180 (Part-I) (level-3) with amendment No. 4, losses at 50 % Load -1354W, Losses at 100% Load - 3909W, Transformer must be BIS approved & BEE Marked, Manufacturer must have a NABL approved Lab and comprises of the following:- (a) Three porcelain bushing suitable for 11kV on HV side and including end termination box complete with copper rods, nuts, bolts and washers. (b) One cable end termination box on LT side (secondary side) consisting of four nos porcelain bushing with copper rods complete with nuts, bolts and washers. (c) Oil conservator with filter type drain valve and oil level guage. (d) De-hydration breather with filter fill of dehydrating agent (Silica gel). (e) Explosive vent, thermometer pocket on tank cover, oil drain filter valve, lifting lugs/ hooks, oil filter hole with cap/ plug with connection plate complete, air release valve plug and four nos plain cast steel detachable roller. (f) One No 100mm, dial type thermometer, vapour pressure type having range 0-120 degree celsius with metal guard having maximum perimeter temperature reading indicator with re-setting device. (g) Two earthing terminal on tank cover to facilitate fixing of 50 x 6mm galvanised iron earth strip for earthing of body. (h) Rating plate an terminal marking plate - 02 Nos (j) Extra bushing for neutral in the LT cable box for providing independent set of earthing for neutral.(k) First filling of new and unused transformer oil IS 335 marked filtered and tested for dielectric strength not less than 50KV at 2.5mm air gap between testing electrodes. (l) Cable terminal Boot for transformer comprising of Basic Impulse level-95kV, Bushing diameter- 30-45mm, Voltage Um-17.5kV max, Description - Flexible Bushing Boots, Diameter D over Termination- 35mm-400mm, suitable for HT/LT XLPE UG Cable sizes- 95 to 240 sqmm. Note 1:- Certification of dielectric strength shall be submitted to the contractor after filling the oil. Note 2:- The Contractor is required to afford all facilities for factory visit, inspection of transformer, testing ON load and OFF load and examination of all material used & workmanship in items assembled or manufactured by them. Note 3:- (i) All the tests including pre-commissioning at site are to be conducted in presence of MES representative/ SEI and all test certificate duly signed by all concerned to be submitted by the contractor to the department before completion of work. (ii) The equipment should carry a guarantee of 30 months from the date of dispatch or 24 months from the date of completion of the contract, whichever is later. Any defect during this period will be attended in a period of three days including spares and labour without any extra cost to Govt.

Supply and fix cable jointing kit for 11 KV grade cable for Indoor/outdoor termination heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size upto 185 sqmm complete all as specified and directed.

Material and labour for transformer platform of size 2.5m x 2.5m x 1.6m height ( 0.6 m below ground level and 1.0 mtr above ground level) comprising of PCC M-7.5 grade (nominal mix) using 40mm graded crushed stone aggregate as in foundation brick work of one brick thick using old size brick in cement mortar 1:6, rendering 15mm thick in cement mortar 1:4 on all exposed brick surface finished smooth using extra cement, filling in approved earth, providing 150mm thick slab M-25 grade (nominal mix) on top reinforced with 12mm dia TMT bars and finishing top surface with 15mm thick plastering in cement mortar 1:4 finished even and smooth using extra cement, including GI pipe light grade 80mm dia of suitable height for cable protection on LT and HT side, white washing of transformer plinth and including suitable brick steps one side of the platform to reach on the platform, details of transformer to be provided on transformer plinth on GI plate, including earthwork, complete all as specified and directed. Note:- Excavation and earth work and PCC shall be included in quoted rate.

Supply and laying in replacement XLPE insulated, armoured heavy duty electric cable with aluminium conductor, 1100 volts grade, cross-sectional area 400 Sqmm 3.5 Core, ISI marked as per IS 7098 (Part-I) in trench/floor/on pole/wall complete all as specified and directed.

Material & Labour for earthing complete with galvanized steel earth plate electrode 600x600x6mm thick buried directly in ground vertically to a depth not less than 2.25m below ground level with top edge of earth plate not less than 1.5m below ground level connected to galvanized iron earth strip 32 x 6 mm by means of bolts, nuts, check nuts, washers of galvanized iron and connected to main switch/control board upto 7.5m away from the earth electrode including excavation earth work, PCC chamber, RCC cover slab char coal, watering pipe, wire mesh lugs, earth lead protection pipe 40mm bore, light grade 7.5m long as applicable and as per plate No. 3 of SSR 2009, complete all as specified and directed. (For Body of Transformer). (a) Excavation and earth work in any type of soil. (b) Drilling of holes in electrode (c) PCC pit in cement concrete (1:2:4) type B-1 (d) 40mm thick Pre-cast RCC cover with suitable handle. (e) Funnel with watering pipe of GI 40 mm nominal bore, medium grade & copper lug etc. (f) 50mm nominal bore medium grade GI protection pipe 7.50 m long for protection of earthing lead. (g) Requisite quantity of charcoal @ 60Kg and common salt@ 80Kg. (h) Details of Earthing to be marked on Earth Pit Cover by paint (like Earth No, Body Earth, earth resistance, date of testing etc). (j) Connection to earthing test point and testing on completion.

Material & Labour for earthing complete with Copper earth plate electrode 900x600x5mm thick buried directly in ground vertically to a depth not less than 2.25m below ground level with top edge of earth plate not less than 1.5m below ground level connected to copper earth strip 32 x 6 mm by means of bolts, nuts, check nuts, washers of galvanized iron and connected to main switch/control board upto 7.5m away from the earth electrode including excavation earth work, PCC chamber, RCC cover slab char coal, watering pipe, wire mesh lugs, earth lead protection pipe 80mm bore, light grade 7.5m long as applicable and as per plate No. 3 of SSR 2009, complete all as specified and directed. (For Neutral link of Transformer). (a) Excavation and earth work in any type of soil. (b) Drilling of holes in electrode (c) PCC pit in cement concrete (1:2:4) type B-1 (d) 40mm thick Pre-cast RCC cover with suitable handle. (e) Funnel with watering pipe of GI 40 mm nominal bore, medium grade & copper lug etc. (f) 80mm nominal bore medium grade GI protection pipe 7.50 m long for protection of earthing lead. (g) Requisite quantity of charcoal @ 60Kg and common salt @ 80Kg. (h) Details of Earthing to be marked on Earth Pit Cover by paint (like Earth No, Body Earth, earth resistance, date of testing etc). (j) Connection to earthing test point and testing on completion.

Material and labour and T&P for disconnecting HT/LT connection, shifting, installing, testing and commissioning of step down Outdoor type copper wound transformer of any capacity from one location to other location within the defence land complete all as specified and directed. Note:- Cost of materials required for connecting, commissioning and testing of transformer shall be deemed to be included in quoted rate.

Supplying and fixing Danger notice plate of 1.6mm thick mild steel sheet, vitreous enamelled white, with letters, figures and conventional skull and bones in signal red colour and fixed with M.S. clamps, bolts and nuts of approved size for HT 25x20 cm, complete all as specified and as directed.

M&L for Loose filling with aggregates of gauge 20 mm crushed stone back colour suitable for spreading in electrical sub stn after preparation site by removing all type of debris, removing unwanted soil, and spreading lime powder beneath the aggregate all as directed.

Excavating in post holes (or similar holes) each n exc 0.5cu.m, getting out, returning, filling in and ramming earth or broken rubble mixed with earth around, in layers not exceeding 25 cm, watering and removing surplus soil to a distance not exc 50m and making good surface in soft / loose soil complete all as specified and directed.