REPAIR/ MAINTENANCE OF TRANSFORMERS AND CONNECTED WORKS AT AF STN GWALIOR

Amount

Disconnecting HT/LT Electric Supply and taking down old existing transformer up to 500 kVA capacity of any description and in any position from the existing indoor/outdoor substation, shifting the transformer to new location not exceeding 10km away from the starting point and installation, fixing and commissioning the transformer connecting the incoming and outgoing connection including testing the transformer complete all as specified and directed.

Dismantling and Taking down the unserviceable breather assembly with silica gel complete for 63 kVA to 500 kVA transformer and supply and fix New breather assembly complete with breather unit and silica gel including connecting with proper rubberized gasket with transformer complete all as specified and directed.

Disconnecting Electric supply and defective indoor/outdoor type transformer of various capacities 63 kVA to 100kVA from HT/LT sides, drain out transformer oil completely and storing the oil in suitable clean containers (to be provided by the contractor) opening Top Cover and lifting assembly and core assembly carefully and checking the condition, refilling the transformer oil completely after necessary repair, and fixing the top cover complete all as directed by Engr-in-charge. Note:- (a) Rewinding of the transformer shall be measured and paid separately. (b) In case of major repairs/replacement in transformer which cannot be undertaken at site the transformer shall be shifted to civil workshop and the quoted rate shall be exclusive of this aspect. (c) Dismantling of core and repairs shall be measured and paid separately (d) Shifting of transformer shall be measured and paid separately.

All as per srl item No 3.00 here-in-before but for transformer of capacity exceeding 160 kVA but not exceeding 200 kVA.

All as per srl item No 3.00 here-in-before but for transformer of capacity exceeding 250 kVA but not exceeding 315 kVA.

All as per srl item No 3.00 here-in-before but for transformer of capacity exceeding 400 kVA but not exceeding 500 kVA.

Dismantling and taking out the existing unserviceable circuit tap changer assembly and supply and fix off circuit tap changer assembly suitable for any make of 63kVA to 500 kVA transformer with 7 tapping position including opening top cover breaker etc, complete all as specified and directed. Note: - Contractor is fully responsible for making good of any damage to transformer during tap changing operations without any extra cost to department.

Supply, filling and for topping up the transformer/OCB’s with new transformer oil duly filtered with filtration plant complete all as specified and directed. Note:- (a) The transformer oil shall be type EHV confirming to IS 3357 of 1983 (b) Mineral oil grade 'B' shall be used. (c) The transformer oil should have a high dielectric strength not less than 40KV. [Make: Indian oil corporation/BPCL/HPCL (d) The empty barral shall be deposited in MES store yard.

M&L for Disconnecting 33 KV/11 KV HT/LV supply from power transformer 3.15 to 5 MVA capacity and opening clamps, bus bar extension and disconnecting of HT 33/ 11 supply to transformer by opening clamps, bus bar extension and isolating the transformer from bus bar out door type, shifting the transformer to civil workshop. Decanting transformer oil complete and taking out cores and windings from body and put in oven for heating the coils for improvement of insulation resistance till proper insulation results achived, cleaning transformer body inside and out side complete, painting with two coats of super enamelled paint inside and out side the body complete after scratching and removing old paint layers, refixing cores and coils in transformer body. Refilling, dehydration and filteration of oil to improve the dielectric strength /insulation value of transformer oil minimum 45 KV and carryout test results such as megger test, Ratio Test, magnetic balance test, short circuit test, full load test, including replacement of wornout nuts bolts, all gaskets, packing sheets, sleeves, temp gauge etc complete reshifting the transformer at MRS install on plate form and connecting HT 33 KV /11 KV connection incl replacement of clamps nuts bolts & washer complete connecting and making control wiring system in serviceable condition and testing of transformer on full load complete all as specified and directed.

Filtration/dehydration of transformer oil through filtration plant to improve the dielectric strength/insulation value of the transformer oil minimum 40KV complete all as specified and directed. Notes:- (a) The contractor will take shut down orders in writing before commencement of the work from Engineer-in-charge. (b) The contractor shall ensure to Avoid wastage at transformer oil. (c) The contractor fully responsible for any damage to the transformer during filtration operations. He is responsible for making good any damage to the transformer at his own cost without any extra cost to the department. (d) The contractor shall ensure that the conservator tanks are full to its level before starting the dehydration.

Replacement of existing unserviceable temperature gauge old type with new temperature gauge of existing specification/Model complete all as specified and directed.

Supply and fixing silica gel complete all as specified and directed

Supply only insulation material PCB electrical grade such as barriers coil to coil insulation block and rings insulation cylinders, ebonite sleeves complete all as specified and directed.

Disconnecting of Electric supply from HT/LT site of Transformar capacity of -63 kVA to 160 kVA and Removing and refixing of new HT & LT coils/strips, disconnecting the 63 kVA to 160 kVA 11KV/430Volts indoor/outdoor transformer HT/LT side, drain out transformer oil completely, storing the oil in suitable container/barrels properly cleaned ones (to be provided by the contractor) lifting the transformer from the sub station and shifting to civil workshop and opening the top cover. and Taking out core Assembly , Opening HT/LT brush damage coil opening / removeing the save and fixing New HT/LT copper coil Made out of proper size suitable for DPC copper wire of high quality suitable rating sleeve insulating materials like varnish etc, complete after necessary arrangement with new coils, necessary insulation spacing blocks, runners and proper refixing of core. Note:- (i) HT & LT copper coil/ strips and insulation material PCB electrical grade such as barriers coil to coil insulation block and rings insulation cylinders, ebonite sleeves shall be measured and paid separately under relevant item schedules. (ii) The rate quoted is deemed to be included for cutting / chipping of RCC and for the minor grill work such as PCC, plastering foundation work. (iii) Proper drying has to be done in drying chamber after drying, taking the core coil assembly, filling the filtered transformer oil having good dielectric strength, replacement of suitable size rubberized cork gasket, bolts and nuts etc complete by fixing top cover, conservator etc, through cleaning and painting to the transformer with good quality paint complete and testing complete at civil workshop. (iv) Transformer oil shall be measured and paid separately under relevant item of schedule. (v) Installation of transformer, testing and connecting the both HT & LT cables, commissioning of transformer after checking voltage and all loading the transformer to the full load all as specified and directed. (vi) The cost of coil will be inclusive of varnish sleeving and insulating material.

All as per srl item No 14.00 here-in-before but for transformer of capacity exceeding 250 kVA but not exceeding 315 kVA.

All as per srl item No 14.00 here-in-before but for transformer of capacity exceeding 400kVA but not exceeding 500 kVA.

Supply only new LT copper strips Coil made out of proper size of DPC copper strips super enameled of high quality matching with the existing impedances and insulation for 63 to 500 kVA transformer complete all as specified and directed.

Supply only new HT copper coil made out of proper size DPC copper wire super enameled of higher quality matching with the existing impedance and insulation for 63 to 500 kVA transformer all as specified and directed by Engineer -in-Charge.

Supply and fixing with replacement HT(11 KV ) bushing assembly including brass stud nuts washers insulators etc. suitable for indoor/ outdoor transformer of capacity 63 to 500 kVA complete all as specified and directed by Engineer-in-Charge.

Supply and fixing with replacement 33KV HT bushing assembly including brass stud nuts washers insulators etc. suitable for indoor/outdoor transformer of capacity 3.15 to 5 MVA complete all as specified and directed .

All as per srl item No 20.00 here-in-before but suitable for 11 KV supply complete all as specified and directed.

Supply and fixing in replacement 12mm dia LT bushing assembly including brass stud nuts, check nuts washers oil seal insulators etc complete all as specified and directed.

All as per srl item No 22.00 here-in-before but of size 16mm dia complete all as specified and directed

All as per srl item No 22.00 here-in-before but of size 20mm dia complete all as specified and directed

All as per srl item No 22.00 here-in-before but of size 30mm dia complete all as specified and directed

Material and labour for preparation of old painted surfaces of floor mounted indoor/outdoor type transformer for the following capacity by cleaning/rubbing with course cloth wire brushes to remove dust deposits oil grease and painting with two coats of synthetic enamel paint complete including writing the SM No/MES No. on transformers with white paint in the existing style/pattern complete all as specified and directed.

(a) 63 to 200 kVA

(b) 250 to 500 kVA

(c) 3.15 MVA to 5 MVA

Dismantling and taking down existing unserviceable/worn out danger notice plate of 33 KV, supply & fixing for danger notice plate 25x30cm size made out of 1.6 mm thick mild steel sheet, duly painted with vitreous enameled white, with letters, figures and conventional skull and bones in signal red colour and fixed with including connected accessories complete all as specified and directed.

Disconnecting and Taking out old unserviceable PG Clamps and Supply and Fixing PG Clamp (11/33 KV)by Compression/crimping type sleeve joints for jointing conductors /jumper connections including treatment with conducting jelly complete all as specified and directed.

Material and labour for earthing complete with galvanized steel earth plate electrode 600mm x 600mm x 6mm buried directly in ground vertically to a depth not less than 2.25 metre below normal ground level (with top edge of earth plate not less than 1.5 metre below ground level) connected to galvanized iron earth strip 32x6 mm (main earthing lead) by means of galvanized bolts, nuts and washers all as shown in electrical plate No 3 of MES Schedule Part-I (2009) with connected to earth test point & to main switch board with & including adequate quantity of charcoal dust and common salt alround earth plate & 40 mm dia GI pipe medium grade for earth lead protection pipe for suitable length and GI pipe 20 mm dia medium grade for watering pipe with funnel & wire mesh including necessary earth work and PCC (1: 3 : 6) type C-1 for earth pit , internal surface of concrete shall be given 10mm thick plaster in CM 1:4 and 40 mm thick precast RCC cover in 1 : 2 : 4 type B1 with 3 Nos 8 mm dia TMT bars both ways with 12mm dia round bar handle complete all as specified & directed.

Supply only following spare parts required for repairs of transformer:-

CRC spray bottle 500ml

Copper strip for connecting cables and LT/HT bushing

Aluminium lugs of 95 to 150 Sqmm size for LT/HT cable

Aluminium lugs of 240 to 400 Sqmm size for LT/HT cable

Disconnecting HT/LT Electric Supply of transformer and drain out trnsformer oil completely, storing the oil in suitable properly cleaned containers/barrels (to be provided by contractor), lifting the transformer from substation and shifting to civil workshop and opening the top cover , taking out core assembly, removing the same and fixing including of high quality suitable rating sleeve insulating material like varnish etc complete after necessary insulation spacing blocks, runners and proper refixing of core including proper drying/ovening that has to be done in drying chamber, taking the core coil assembly, filling the filtered transformer oil having good dielectric strength, replacement of suitable size rubberized cork gasket, bolts and nuts etc by fixing top cover conservator etc . Cleaning and painting the transformer with good quality paint and testing at civil workshop. Installation , testing, commissioning and connecting the transformer with both HT & LT cables after checking the voltage and loading transformer to full load complete all as specified and directed.

(a) 63 to 200 kVA

(b) 250 to 500 kVA

(c) 3.15 MVA to 5 MVA

Dismantling and Taking down the unserviceable breather assembly with silica gel complete for 3.15MVA to 5MVA transformer and supply and fix New breather assembly complete with breather unit and silica gel including connecting with proper rubberized gasket with transformer complete all as specified and directed.

M/s Sagar Construction

Kumar Sales Corporation

anand enterprises