REPAIR/ MAINTENANCE OF TRANSFORMERS OF VARIOUS CAPACITY AND VOLTAGE RATING AT 7AFH KANPUR

Amount

Complete over hauling, commissioning and testing of transformer of 11KV / 415 Volt, step down, out door/indoor type of capacity up to 500 KVA of comprising the following work services at 11 KV Sub Stn at 7 AFH:- (a) Disconnection of cable termination of HV & LV ends. (b) Opening of top cover by removing nuts, bolts and all mounting accessories and conservator tanks for visual inspection. (c) Checking of HV/LV insulators including internal inspection (d) Replacement of corroded nuts/bolts with double washers, burned lugs, etc by new one (e) Servicing of tap changing gears by cleaning and polishing tapping contact points. (f) Removing, cleaning, polishing of bushings and studs of both HV/LV side by using soft cotton cloth including checking for cracking and refixing the same. (g) Refixing all cable terminals HV & LV sides and transformer top cover, conservator tank and other fitments in position. (h) Filling of new silica gel in breather. (j) Connecting HV & LV side with existing incoming and outgoing cables including re-connection of earth strip/lead. (k) HV side cable connection shall be made with new HV tape & M Seal Monoplast as required at site. (l) All marshalling boxes to be cleaned from inside. (m) All the terminal connection of control and relay wiring to be checked and tighten. (n) Examine the rollers carefully includes greasing them properly. (o) Checking of earthing connection and tightening nuts& bolts with ensuring the earthing system working properly. (p) Buchloz relays where ever mounted on the transformers shall also be checked and made serviceable.

(q) The cost of replacement of unserviceable nuts, bolts with double washers, HV / LV tape used, M-Seal, Monoplast, cable end socket, etc shall deemed to be included in the quoted rate. (r) For inspection of internal defect of transformer, the contractor shall provide proper lifting arrangements like tripod, chain &pully, T&P etc and the cost on this account shall deemed to be included in the quoted rate. (s) Contractor shall isolate the transformer from the supply and do earth the transformer properly while servicing the transformer (t) The entire service included Transformer with or without OLTC/off load tap changer. (u) Rectifying and arresting the oil leakage of transformer of any capacity, disconnection of cable termination of HV& LV ends , opening the top cover by using tripod, chain and pulley after removing all fitments, replacing the components of the transformer such as gaskets, "O" rings etc. Rectify the leaks in a variety of areas such as radiator fins, flanges, circuit breakers, valves, fastener assemblies, Oil leakage through pin hole / crack joint , drain valve / radiator valve , Oil leakages through gasket joints. Applying putty/M-Seal Monoplast where ever necessary. Refixing the top cover and all fitments, refixing cable termination of the HV& LV ends, testing and Cost of all type of gasket, "O" rings, putty/M-Seal Monoplast, lugs, nuts, bolts, double washers etc shall deemed to be included in the quoted rate. (v) Painting of transformer of with or without OLTC including HV/LV side marshalling box with one coat of synthetic enamel paint by using spray painting method including cleaning of existing surface of all dirt and greasy materials alongwith marking of SM/MES Nos with sticker letters n. exc 2 cm height at appropriate places complete after isolating the transformer from the electric supply and to be earthed all as specified and as directed. (w) Cost of transportation of transformer upto workshop & back and disconnection, dismantling, installation after repair including electic /earth connection is deemed to be included under quoted rate.

NOTE :- (i) The transformer shall be got repaired from authorised work shop of transformer. The contractor shall also produce test certificate as per IS-1180 alongwith high voltage test from the firms after repair. (ii) All the transformer shall be opened in presence of Engr- in- Charge/ rep of Engr-in-Charge to verify the various repairs/replacement involved and the transformer shall be assembled in the presence of Engr- in- Charge/his rep after necessary repairs/replacement. (iii) All the transformer shall be tested in the authorised workshop in the presence of Engr- in- Charge/ his rep, as per ser note No 1 above and also in addition the transformer where specified to be installed and commissioned on the 2/4 pole structure, platform and also shall be tested by the contractor in the presence of and as directed by Engr- in- Charge. (iv) All the testing arrangement shall be provided by the contractor without any extra payment. (v) The contractor shall also furnished a guarantee certificate himself and from the firm where the transformers are repaired by the contractor for rectification of the defects. If any defect noticed during liability period for 02 year from the certified date of completion and shall be rectified by the contractor under his own arrengment with no financial assistance from the deptt.

(vi) The above shall however does not absolve the responsibility of the contractor for rectification of any defect, if any noticed during guarantee period of 02 year as per condition 46 of IAFW-2249 and the contractor shall be solely responsible for entire completion of work and for rectification of the defect/replacement of items/parts and required pointed out by the GE during defect liability period of 02 year. Payment only for dehydration of the transformer oil and painting of the transformers replacement of certain items considered separately here- in- before shall only be made for separately. All other minor repair/replacement as required and ordered by the Engr- in- Charge for entire completion of work shall be deemed to be included in the unit rate of the above items. (vii) The contractor shall also clear the breathers. The unit rate quoted by the contractor shall included this aspect also. (viii) Contractor shall provide all arrangement for carefully handling/ transportation of equipment by means of crane/chain pully/recovery van and vehicles as per requirements and directed by Engr- in- Charge. (ix) Transformer oil tank rubberised 6.0mm thick gasket sheet pasted using gasket solvent, oil level gauge, drain valve, painting inner side tank by zinc chromate paint and outer side by approved paint included in this item rate. (x) The rate quoted by contractor shall include all these aspect. While quoting the tender, that quoted rate also include the provisioning of providing electric connection to exisiting system.

Supply and filling & topping up of transformer oil at site having dielectric strength not less than 45 KV during filling after initial filtration conforming to IS-335. Transformer oil shall be supplied in sealed container and empty barrel of transformer oil will be deposited by contractor in E/M store yard complete all as specified and directed. Make :- HP, BPL, IOC, SAVITA or equivalent as approved by GE. (NOTE : Before topping up transformer oil sealed container shall be got checked at MES store yard).

Supply and fixing of air breather assembly as per existing size with silica gel of superior quality for air breather of transformer complete all as specified and as directed.

M&L for chemical earthing complete with copper plate electrode 900mmx600mm x 5 mm thick buried directly in ground with top edge of plate not less than 4.5mtr deep below the normal ground level connected to copper strip 32 x 6mm copper strip as main earthing lead and connected and tinted copper bolt, nuts, check nuts ad washers besides brazing at all joints all as directed and connected to earth test point all as specified and directed with and including necessary excavation and earth work, returning filing, removal of extra soil etc, filing adequate quantity of charcoal dust, common salt and MgSO4, PCC (1:3:6) type C-1 using 20mm graded stone aggregate for earth pit chamber with 40mm x 40mm x6 mm mild steel angle iron frame for cover, pre-cast 50 mm thick RCC cover in (1:2:4) type B-1 using 20 mm graded stone aggregate , reinforcement with 8mm TMT bar @ 75 mm c/c on both way , funnel with wire mesh and 50mm dia galvanised iron pipe light grade for earth lead protection and 40 mm dia galvanised iron medium grade for watering including testing on completion complete all as specified and as directed at 33 KV Sub Stn Chandmari and 11 KV Sub Stn at 7 AFH. Note :- (i) The excess requirement (if more than 7.5 Mtr) of copper strip will be measured and paid separately.

M&L for rewinding of transformer with supper enameled double paper covered copper wire/ strip for HV/LV (11KV / 415 Volt) winding having existing size and giving proper insulation and de-moisturizing before assembling the winding core and including primary testing, ratio testing, no load testing, core insulation testing including taking out unserviceable winding wire complete all as specified and as directed.

Replacement of transformer oil temperature gauge, range shall be 0 to 120 degree centigrade as per existing type and model complete all as specified and as directed.

S&F Copper strip 32 x 6 mm for extension of earth and connected to transformer/equipment or panel with proper clamp,saddle,nuts,bolts and washers etc properly complete all as specified and as directed .

Supply, installation, testing and commissioning in replacement of isolator 33KV, outdoor type duty isolator, hand operated triple pole, off circuit, fault making, horizontal mounted,18 insulator type, centre post rotating type, double stac, 33 KV, 400 Amps, as all as specified in particular specification and as per IS-9921 including taking down old unserviceable isolator complete all as specified and as directed.

Taking out existing HT cable off sizes up to 120 Sqmm 3 core from duct/wall/floor/ trenches as required at site complete all as specified and directed by Engineer-in-Charge.

Excavation in trenches not exc 1.5 Mtr wide and not exc 1.5 Mtr in depth and getting out in soft/loose soil complete all as specified and as directed.

Returning, filling in including spreading, levelling, watering & well ramming in layers not exceeding 25 cm thick complete all as specified and as directed.

Removing excavated soil/demolished material not exceeding 50 Mtrs from the starting point and depositing where directed at a level nexc. 1.5m above the starting point complete all as specified and directed by Engr-in-Charge.

M&L for dry Ganga sand for cushioning for laying cable in trenches all as directed by Engineer-in-Charge. Note:-Punned thickness shall be considered for measurement purpose.

Supplying and laying un- reinforced precast concrete cable cover, class HV type 1, flat, size 300mmx180mmx40mm.

Supply & laying HT XLPE Insulated screened aluminium stranded conductor cable PVC bedded galvanized strip armoured heavy duty 11 KV cross sectional area 120 Sqmm 3 Core conforming to IS 7098 lead in duct/trenches/supporting with pole /passing through pipe complete all as specified and directed.

Dehydration/ filtration of transformer oil of existing transformer installed at site with portable plant to improve the dielectric strength 50 to 70 KV including top up transformer oil upto the level complete all as specified and directed. (Note:- (i) Conducting field testing of di-electric strength and acidity test of Tr. Oil to be carried out with acidity test kit before and after filtration. (ii) Transformer oil required for top up shall be measured and paid separately. (iii) The Contractor shall arrange his own the electric power rquired for testing/ de-hydration if required.

Supply, Jointing, testing and commissioning of heat Shrinkable end joint kit outdoor type complete with all fittings and jointing materials suitable for HT11 KV ( E ) XLPE cable 50 to 95 sqmm 3 core all as specified and directed.

Supply, Jointing, testing and commissioning of heat Shrinkable end joint kit outdoor type complete with all fittings and jointing materials suitable for HT11 KV ( E ) XLPE cable 120 to 185 sqmm 3 core all as specified and directed.

M&L for painting of transformer indoor/ outdoor on plinth/ pole/ in workshop with one coat of synthetic enamel paint with compressor spray Gun after removing all dust, Rust, scraping with emry paper and cleaning by thinner and finishing the surface smooth. Paint shall confirmed to IS-2032 and writing SM & MES No with letter not less than 50mm with white paint on location complete all as specified and directed for 500 KVA capacity of transformer.

M&L painting of steel structure surfaces of CT, PT, LA, SF-6 & isolator, DO etc such as columns, bracing, gantary MS channels, angle iron of any size and shape with two coats of synthetic enamel aluminium paint after preparation of old painted surface complete all as specified and directed. (Make of paint : Berger paints (Luxol)/ Asian paints (Apcolite)/ ICL paints (Dulux).

Draining out Servo Voltage Stabilizer oil of capacity 500 KVA and keeping safe for re-use,dismantling various parts of Servo Voltage stabilizer etc, opening of top cover of Servo voltage stabilizer, lifting and taking out carefully winding core assembly with the suitable chain pully arrangement for repair, cleaning of sludge including washing down with clean oil complete all as specified and directed.

Taking out old unserviceable winding wire of Servo Voltage Stabilizer including removing of unserviceable insulating materials from core assembly of stabilizer with and including M&L for rewinding with super enameled copper wire double paper insulated of existing gauge copper wire including de-moisturising/ovening winding core assembly of capacity 500 KVA Servo Voltage Stabilizer, re-fixing the winding core assembly and other parts of Servo voltage stabilizer including testing i.e. ratio test, insulation test etc. and re-connecting of incoming and outgoing connection etc. complete all as specified and directed.

M&L for insulating material required for Servo voltage stabilizer core, winding, providing cotton tapes, spacers etc complete all as specified and directed.

A.B.Enterprises

M/S Asian Engineers

Kumar Electricals

Bharat Sales Corporation