SPECIAL REPAIR/ REPLACEMENT TO TRANSFORMERS AT AF STN NALIYA

Supply, install, testing and commissioning of AC, 3 phase. 50 Hz 100 KVA capacity transformer step down outdoor/indoor type 11/0.433 KV 50 Hz copper wound, oil cooled (ONAN) complete with oil tank including first fill of ISI marked insulating oil up to top level, oil level indicator, breather with silica gel, lifting works, drain valve, air vent valve, tackle wheel with channel and lowering arrangement with external cooling tubes, core type, delta connected on primary side (HV) and star connected on secondary side (HV) in accordance with vector symbol DYN-11 (vector Group-4) with neutral brought out on secondary side (LV side) OFF load tap changer with manual voltage regulation 0.433 KV suitable steps/position on HV side to galvanized of 11 KV on LV side and provision of following accessories and connecting with electrical system, earthing etc., including all Jointing materials testing and commissioning all as per IS 1180-2014 and energy efficiency level-III (with amendment No. 04) including filling of transformer oil conforming to IS:335-1993 and shall consist of following :- (i) 03 Nos porcelain HT bushings with brass/gun metal bushing rods complete with nut and washers on primary (HV) side, suitable for HT, 11 KV XLPE cable of size 3 core 95/120sqmm. (ii) 04 Nos porcelain LT bushings with brass/gun metal bushing rods complete with nut and washers on secondary (LV) side. suitable for LT, 11 KV/0.433 KV XLPE Cable with provision of LV cable box. (iii) Oil conservator with filter type drain valve and oil level gauge. (iv) De-hydrating breather with first fill dehydrating agent (silica gel). (v) Explosive vent. (vi) Thermometer pocket on tank cover. (vii) 01 No. 100mm dia, dial type thermometer vapor pressure type having range 0-120 degree Celsius with metal guard having minimum reading temperature indicator with resetting device. (viii) Two earthing terminals to be provided diagonally on either side of tank cover to facilitate fixing of 50x6mm galvanized from strip for earthing of neutral and body. (ix) Rating plate and terminal marking. (x) Oil level gauge. (xi) Oil level filter valve. (xii) Lifting lugs. (xiii) Oil filling hole with cap/plug with connecting plate complete. (xiv) Air relief valve plug. (xv) Fore plain solid cast steel detachable rockters.(xvi) First filling of new and usable transformer oil IS-335/93 (4th revision) marked filtered and tested up to 45KV di-electric strength 2.5mm between testing electroly. (xvii) Separate neutral bushing to be provided for earthing. (xviii) Provision of 2 nos danger boards 250/200mm size made of 1.6mm thick plate, vitreous enameled white letters figure of voltage and conventional skull and bones. (xix) Any other fittings/accessories so as to confirm the whole transformer to IS 1180: 2014. (xx) Tapping range (+) 7.5% to (-) 7.5% of 2.5% each, 7 steps. (xxi) Percentage impedance at 75 at rated - 4.5% (xxii) LV winding - 100KVA (copper wound) Energy efficient level. (xxiii) Transformers shall be of make: BHEL/ SIEMENS/ BHARAT BIJLEE/ CROMPTON GREAVES/ SCHNEIDER/ ABB/ ITE GURGAON/ VOLTAMP/ ANDREW YULE/ ESENNAR/ JAYBEE BTI. Note: Each rating of distribution transormer must necessarily have BIS certification, BEE star labelling and valid type test duly issues by NABL accredited BIS approved Lab.

Supply, install, testing and commissioning of AC, 3 phase, 50 Hz, 200 KVA capacity transformer step down outdoor/indoor type 11/0.433 KV 50 Hz copper wound, oil cooled (ONAN) complete with oil tank including first fill of ISI marked insulating oil up to top level, oil level indicator, breather with silica gel, lifting works, drain valve, air vent valve, tackle wheel with channel and lowering arrangement with external cooling tubes, core type, delta connected on primary side (HV) and star connected on secondary side (LV) in accordance with vector symbol DYN-11 (Vector Group-4) with neutral brought out on secondary side (LV side) OFF load tap changer with manual voltage regulation 0.433 KV suitable steps/position on HV side to galvanized of 11 KV on LV side and provision of following accessories and connecting with electrical system. earthing etc., including all jointing materials testing and commissioning all as per IS 1180-2014 and energy efficiency level-III (with amendment No. 04) including filling of transformer oil having conforming to IS:335-1993 and shall consist of following: - (i) 03 Nos porcelain HT bushings with brass/gun metal bushing rods complete with nut and washers on primary (HV) side, suitable for HT, 11 KV XLPE cable of size 3 core 95/ 120sqmm. (ii) 04 Nos porcelain HT bushings with brass/gun metal bushing rods complete with nut and washers on secondary (LV) side suitable for LT, 11 KV/0.433 KV XLPE cable (iii) Oil conservator with filter type drain valve and oil level gauge. (iv) De-hydrating breather with first fill dehydrating agent (silica gel). (v) Explosive vent. (vi) Thermometer pocket on tank cover. (vii) 01 No 100mm dia, dial type thermometer vapor pressure type having range 0-120 degree celsius with metal guard having minimum reading temperature indicator with resisting device for transformer. (viii) Two earthing terminals to be provided diagonally on either side of tank cover to facilitate fixing of 50 x 6mm galvanised from strip for earthing of neutral and body. (ix) Rating plate and terminal marking. (x) Oil level gauge. (xi) Oil level filter valve. (xii) Lifting lugs. (xiii) Oil filling hole with cap/plug with connecting plate complete. (xiv) Air relief valve plug. (xv) Fore plain solid cast steel detachable rockters. (xvi) First filling of new and usable transformer oil IS-335/93 (Fourth revision) marked filtered and tested up to 45KV dielectric strength 2.5mm between testing electroly. (xvii) Separate neutral bushing to be provided for earthing. (xviii) Provision of 2 nos danger boards 250/200mm size made of 1.6mm thick plate, vitreous enameled white letters figure of voltage and conventional skull and bones. (xix) Any other fittings/accessories so as to confirm the whole transformer to IS 1180:2014. (xx) Tapping range (+) 7.5% to (-) 7.5% of 2.5% each, 7 steps. (xxi) Percentage impedance at 75 at rated - 4.5% (xxii) LV winding - 200KVA (copper wound) Energy efficient level. (xxiii) Transformers shall be of make: BHEL/ SIEMENS/ BHARAT BIJLEE/ CROMPTON GREAVES/ SCHNEIDER/ ABB/ ITE GURGAON/ VOLTAMP/ ANDREW YULE/ ESENNAR/ JAYBEE BTI. Note: Each rating of distribution transormer must necessarily have BIS certification, BEE star labelling and valid type test duly issues by NABL accredited BIS approved Lab.

M & L for Earthing of machinery/ equipment installed at power house/ substation, using GI plate of size 600 x 600 x 6mm, as earth electrode buried directly in ground (earth pit not less than 2.25 metres deep below ground level) using 30 x 6mm GI strip as earthing lead connected to earth electrode by means of bolts, nuts, check nuts and washers of galvanised iron sheet, passing through protection pipe of 25mm dia light grade GI pipe all as shown in electrical plate No.3 of SSR Part-I, and connected to earthing test point complete including testing filling of adequate quantity of charcoal dust and common salt including refilling earth and removal of surplus soil up to 50m apart and PCC 1:3:6 type C1 chamber precast RCC cover 40mm thick reinforced with 6mm dia MS bar 3 nos. both way with handle made out of 20mm dia MS base water pipe with wire mesh, funnel etc and connecting testing etc. complete all as directed by Engr-In-Chagre. Note: (i) The contractor shall re do the earthing without any extra cost failing to achieve desired value. (ii) Rates are deemed to include for removing old existing earthing and removing the old earthing material to store for selling to contractor under Sch. of Credit. (iii) Earthing plate, earthing strips, GI tubes & reinforcement bars shall be ISI marked.