REPAIR/MAINT OF DISTRIBUTION TRANSFORMER, VOLTAGE STABILIZER, ISOLATION TRANSFORMER AND INSTALLATION AT VARIOUS LOCATION AND CONNECTED WORKS AT AF STN NAL.

Amount

Repair to distribution transformer step down 11 / 0.433 KV indoor /outdoor type of capacity upto 250 KVA after dismantling the transformer carefully , opening the top cover of transformer for inspection/repair, draining out the transformer oil from the housing complete , taking out the core and winding by disconnecting the internal connections , removing the carbon/sludge deposit in transformer housing core , replacement of unserviceable rubber bushes and washers, replacement of tap changer winding and thimbles, replacement of silica gel,replacement of top cover gasket set including pasting with pasting material,replacement of worn out nut and bolts , replacement of unserviceable of LT & HT bushes , cutting the burnt out winding and re-winding the same with suitable size of super enamelled copper wire as per existing gauge , insulating the winding connection by using fire proof sleeves and fire proof tape , varnishing the coil , keeping the coils in electric oven chamber for 24 hrs to remove the moisture , painting of complete transformer body from outside and inside , marking MES/SM number etc replacement of conservative tank glass , re-installing thr core and winding inside properly , making all connection with suitable copper lugs ,filling of new transformer oil , reinstalling the top cover after cleaning and painting of housing , conservator tank ,expulsion vent etc ,Meggering the LT and HT side of the transformer and testing complete all as specified and directed . Note : (i) Winding wire ,HT/LT bushes ,transformer oil will be measured and paid separately as supply only (ii) Contractor is required to submit test report for repaired for transformer duly signed by Engineer-in-charge before reinstallation . (iii) The qouted rate is inclusive for refixing the transformer after repair , no extra cost shall be admissible to the contractor in this account .

All as per srl item No.1.0 above but capacity 250 KVA to 500 KVA complete all as specified and directed .

Supply only brass terminal rod with nuts , bolts washer and bushing suitable for HT and LT side of the transformer of any make and capacity upto 160 KAV complete all as specified and directed .

All as per srl item No 3.0, above but capacity 160 KVA upto 250 KVA complete all as specified and directed .

All as per srl item No 3.0, above but capacity 250 KVA upto 500 KVA complete all as specified and directed .

Supply only super enameled copper conductor wire of suitable gauge and size as per requirement for rewinding of 11/0.433 KV distribution transformer complete all as specified and directed .

Supply only tap changing switch suitable for operation on 11/0.433 KV distribution transformer with tapping's on 2.5% , 5% and 7.5% on requirement basis for upto 500 KVA capacity transformer complete all as specified and directed .

Material and labour for filtration and dehydration of transformer oil by dehydration machine to achieve the die-electric strength / strength/insulation value upto 65 KV/40KA (RMS) at standard gap of electrodes 2.5 mm for one minute in various capacity of transformers including insulation testing of oil with the help of suitable equipments before and after dehydration including BDV test complete all as specified and directed . Note : (i) Contractor will have to arrange the dehydration machine and transformer oil dielectric strength testing equipment as mentioned and same shall be deemed to be included in the item rate quoted . (ii) Test result of transformer oil before before and after dehydration is required to submit by contractor duly signed by all concern . (iii) The contractor shall ensure that the conservator tanks are full to its level before commencement of dehydration process . (iv) additional quantity of transformer if any required for making the oil level upto the requirement in transformer shall be measured and paid separately as supply and filling but its cost of heating shall be deemed to be included in the rate quoted for above item .

Supply and filling for top-up of transformer power oil meeting IEC 60296-2003-11 , 3rd edition standard specification and ASTMD 1275B test requirement for corrosive sulphur of BDV not less than 65KV for filling in repaired transformer HT 11KV complete all as specified and as directed .

Supply, fixing and testing in repair of double gong alarm bell round working as single phase 230 V AC 50 Hz of size 15 cms (6") complete with fixing arrangement in wooden box completely all as specified and directed.Make Kheraj Model No DGB 15.

Material and labour for cleaning and preparation of steel surfaces of existing dull painting of transformer indoor/ outdoor type including radiator , cooling ducts , vent pipe etc and applying two coats of synthetic enameled paint (Heat resistant type) according to IS colour code by spray machine including writing MES/SM No in capital letters of suitable size on body for capacity upto 160 KVA transformer outdoor/indoor complete all as specified and directed .

All as per srl item No 11.0, above but capacity above 160 KVA upto 250 KVA complete all as specified and directed .

All as per srl item No 11.0, above but capacity above 250 KVA upto 500 KVA complete all as specified and directed .

All as per srl item No 11.0, above but capacity above 2.15/3.15 MVA complete all as specified and directed .

Dismantling and taking down by removing HT and LT connection of indoor /outdoor type 11/0.433 KV transformer of capacity 200 KVA to 500 KVA from existng platform . Lowering the same carefully and shifting to other location within Air force station as directed by Engineer-in-charge with and including reinstallation by means of arrangement and testing complete all as specified and directed . Note : Installation of transformer , testing and connecting the both HT/LT cables , commissioning of transformer after checking voltage and loading at full load shall deemed to be included in quoted rates . Note : Contractor shall provide necessary tripod, chain & pulley, T&P, etc for transportation and the rent shall deemed to be included in the quoted rate.

M&L for rectifying and arresting the oil leakage of transformer of any type (indoor/outdoor) and capacity upto 160 KVA installed inside sub stn bldg or on open foundation , disconnection of cable termination of HT & LT ends. , opening the top cover by using tripod/chain and pulley after removing all fitments, replacing the following components of the transformer such as gaskets, "O" rings, etc and rectify the leaks in a variety of areas such as top cover, radiator fins, flanges, valves, conservator, Oil leakage through pin hole / crack joint , drain valve / radiator valve ,HT/LT bushes, Oil leakages through any gasket joints. Applying putty/M-Seal Monoplast where ever necessary. Refixing the top cover and all fitments, refixing cable termination of the HT & LT ends, testing complete. Note : (i) Contractor shall provide necessary tripod, chain & pulley, T&P, etc and the rent shall deemed to be included in the quoted rate. (ii) Cost of all type of gasket, "O" rings, putty/M-Seal Monoplast, lugs, nut bolt, double washers, etc shall deemed to be included in the quoted rate.

All as per srl item No.16.0 above but capacity above 160 KVA upto 250 KVA complete all as specified and directed .

All as per srl item No 16.0 above but capacity above 250 KVA upto 500 KVA complete all as specified and directed .

S&F in repairs drain out/filling in oil valve screwed both ends with iron wheel head suitable for transformers up to 160 KVA capacity complete all as directed.

All as per srl item No.19.0, above but capacity above 160 KVA upto 250 KVA complete all as specified and directed .

All as per srl item No19.0, above but capacity above 250 KVA upto 500 KVA complete all as specified and directed .

Supply and fixing in repair of heavy duty breather assembly with Silica jel cristal for Transformer as per existing shape and size complete all as specified and directed

Supply and filling as in repair of superior quality silica jel inside the breather assembly and fixing properly with transformer complete all as specified & directed.

S&F in repair transformer radiators fabricated from pressed steel sheet all as per existing size and type including fixing arrangement by making welding joint or flanged joints with gaskets/nuts/bolts etc for transformer capacity from 160 KVA and upto 315 KVA complete all as specified and directed. Note :- Joint shall be leak proof and any leakage noticed after repair work shall be rectified by the contractor without any extra cost to the deptt.

All as per item No 24.0 , here-in-before but transformer capacity from 400 KVA and upto 500 KVA.

M&L cleaning of transformer radiators with hot insulating oil to remove all blockages/sludge etc by dismantling the same from the transformer tank body and refixing the same by making welding joint or flanged joints with gaskets/nuts/bolts etc all as per existing for transformer capacity upto 500 KVA complete all as directed. Note :- Joint shall be leak proof and any leakage noticed after repair work shall be rectified by the contractor without any extra cost to the deptt.

S&F in repairs HT / LT side box covers made of bakelite sheet 10 mm thickness with proper nuts bolts incl cutting sheet to required size , drilling holes for nuts/bolts etc complete all as specified and directed.

S&F in repairs transformer oil temperature gauge 0 -120 degree analogue dial type complete all as specified & directed

M&L for rewiring of the complete control circuits of 11 KV HT VCB /RMU of any make with single core copper conductor cable of size as per existing for metering/safety relays/indicators/charging system/tripping closing wiring circuits/ connections from CTs,PTs/cubical lamp & socket/thermostat & space heater/Dc power supply system for relays etc incl numbering ferrules for marking of the circuits complete all as specified and directed.

Material and labour straight through joint HT 11000 volts, grade heat shrinkable of cable Cross sectional area 95 Sqmm, 3 core complete all as specified and as directed. Note : Excavation & earthwork shall be measured and paid for separately

All as per item No. 30.00 above but for cable of 70 sqmm, 3 core.

Supply and fixing End termination joint (Out door type) heat shrinkable HT 11000 volts grade of cable Cross sectional area 120 Sqmm, 3 core complete all as specified and as directed.

All as per item No. 32.00 above but for cable of 95 sqmm, 3 core.

Excavation in trenches not exceeding 1.5 metre wide and not exceeding 1.5 metre in depth for laying of cable and getting out in soft / loose soil complete all as specified and as directed.

Returning, filling in trenches including spreading, levelling, watering and well ramming in layers not exceeding 25 cm in soft / loose soil complete all as specified and as directed.

Removing excavated materials to a distance not exceeding 50 metre and depositing where directed at a level not exceeding 1.5 metre above the starting point complete all as specified and as directed.

Material and labour sand cushioning (Tibba Sand) for protection of underground cable, consolidated and compacted with clean dry sand complete all as specified and as directed.

S&F as in repair welded steel wire fabric n. exc 4 kg/ sqm complete to wood or steel members complete all as specified and directed.

M&L for steel section posts and struts in fencing including cutting tops to shape as directed, drilling holes, notching for wire, etc. flat iron fillets (for securing wire mesh etc.) including all necessary drilling, bolting or riveting, etc., and similar work conforming to Fe-290 Gde E-165 complete all as specified and directed.

M&L for painting of new steel surface, by applying two coat of synthetic enamel paint after scraping/brushing and cleaning on new steel surface over a coat of primer including necessory preparation complete all as specified and directed.

Demolition of cement concrete in ground floors and paving n exc 15 cm thickness complete all as specified and directed.

Material and labour for plain cement concrete 1:4:8 type D2 using 40mm graded aggregate as in foundation.

Material and labour 100mm thick cement concrete type D-2,1:4:8 (using 40mm graded crushed stone aggregate )as in sub base complete all as specified and as directed by Engineer-in-charge.

Material and labour 100mm thick cement concrete type B-1, 1:2:4 (using 20mm graded crushed stone aggregate ) as in floor finished even and fair without using extra cement complete all as specified and directed.

Demolition of brick or stone masonary built in cement mortar incl all quoins, arches, pillar etc. complete all as specified & directed.

Material and labour for brickwork with sub class 'B' bricks, straight or curved on plan exc 6m mean radius ,built in cement mortar 1:6 .

Material and labour rendering 15mm thick in cement mortar 1:4 on brick work or concrete surface and finished even and smooth without using extra cement and complete all as specified and directed .

Repair to isolation transformer indoor /outdoor type of capacity upto 200 KVA after dismantling carefully , opening the top cover of transformer for inspection/repair, draining out the transformer oil from the housing complete , taking out the core and winding by disconnecting the internal connections , removing the carbon/sludge deposit in transformer housing core , replacement of unserviceable rubber bushes and washers, replacement of thimbles, replacement of silica gel,replacement of top cover gasket set including pasting with pasting material,replacement of worn out nut and bolts , replacement of unserviceable LT connector , cutting the burnt out winding and re-winding the same with suitable size of super enamelled copper wire as per existing gauge , insulating the winding connection by using fire proof sleeves and fire proof tape , varnishing the coil , keeping the coils in electric oven chamber for 24 hrs to remove the moisture , painting of complete body , marking MES/SM number etc replacement of conservative tank glass , re-installing thr core and winding inside properly , making all connection with suitable copper lugs ,filling of new transformer oil , reinstalling the top cover after cleaning and painting of housing , conservator tank ,expulsion vent etc , and testing complete all as specified and directed by Engineer-in-charge . Note : (i) Winding wire for making of coils ,HT/LT bushes , new transformer oil will be measured and paid separately . (ii) Contractor is required to submit test report for the repair duly signed by Engineer-in-charge before rinstallation . (iii) Cost of transportation shall be included in the unit quoted rate . (iv) Spare parts required if any shall be measured and paid separately .

Supply installation & commissioning in replacement of 24V/40A Float Cum Boost Battery Charger unit including battery bank comprising 02 Nos of 12 Volts-100 AH sealed maintenance free battery. The CCCV battery charger consisting of copper wound, air cooled transformer, 01 Set single phase full wave bridge rectifier consisting of diodes and SCRs, liberally rated mounted on heat sink and complete with resistor/condenser network for surge supperssion . During auto float mode automatic changeover shall take place from float mode to boost mode and vice versa, 01 Set of solid state constant potential controller to stabilize the DC output voltage of the float cum boost charger, 01 No electronic controller , DC digital ammeter , DC digital voltmeter, Potentiometer , DC, MCB for reverse battery protection . The charger should have alarm annunciation with visual and audible alarm with manual reset facility for fuse fail alarm. Float cum boost battery charger and DC distribution board shall be housed in powder coated sheet steel cubicle with panels of 1.6mm thickness , louvers for ventilation , gland plate will be provided for cable entry from bottom . The battery charger shall be divided into two compartments. The upper compartment shall house the battery charger & DCDB with all necessary controls. The lower compartment shall be suitable for housing the batteries. Tech specification shall be as under:-

(a) Input working voltage-180 -270 Volts (b) Nominal Input Voltage - 230 V , AC , 50 Hz,1 (c) On load input power factor - > 0.8 (d) On load unit watt efficiencies-> 80% (e) No load losses of complete charge-< 10% (f) Ripple contents on the load (RMS)= 1% to 5% (g) Over load - 110% for 30 minutes and will give visual indication for over load condition. (h) Boost charging - 2.4 V/Cell . (j) Float charging -2.15 V/Cell (k) Float cum boost charging-Automatically changes from one state to another state as per battery condition and will give the visual indication for either float or boost based on charging mode. (l) Reverse polarity -No damage will caused . A visual indication for reverse polarity will appear with an audio alarm. (m) Short circuit-MCB protecton provided. Make of battery charger. Statcon/Sinetrac/Amar Raja Make of batteries. Exide/Amaron/Okaya

Disconecting the LT incoming and outgoing main cables of any size ,strip opening of the voltage stablizer of capacity from 40KVA to 200KVA , draining out the oil into a cleaned container ( container shall be arranaged by the contractor ).Lifting up dimmer and transformer with help of tripoid and chain pulley etc (The T & P shall be arranged by contractor ), checking of all the parts ,cleaning and servicing of the container,dimmer,transformers coil and allied parts including replacememnt of minor parts like nut bolts ,connecting wires ,rubber seals /packing etc . ( The repair/ replacement of the major parts shall be measured and paid seperately under respective item as supplu only ) and reassembling the volt stablizer complete (in reverse order.). Refilling oil after dehydration and filtration/cleaning by centrifuging machine including testing of samples before and after dehydrations and filtration complete, and reconnecting the incoming and outgoing cable connection, commisioning and testing of the volt stablizer on load complete all as specified and directed. Note: The cost of dehydration of oil shall be measured and paid under respective item of schedule

M&L for preparation of old painted surfaces steel by brushing/changing stain, greasy spots with thinner and apply two coats of spray painting with with super enameled smokes grey colour paint of approved by Dept. and writing the MES /SM No with white paint as directed to Servo Volage Stab. indoor/outdoor of capacity upto 200 KVA installed at various different locations complete all as specified and directed at site.

Supply only in repair of digital display unit (Auto control card) suitable for servo type voltage stabilizer with complete wiring suitable for 40 to 200 KVA stablizer. complete all as specified and directed.

Supply only in repair of Dimmer coil (Variable transformer) suitable for servo voltage stabilizer with complete wiring suitable for 40 to 200 KVA complete all as specified and directed.

Supply only in repair of motor gear assembly suitable for 40 to 200 KVA capaicty servo type voltage stablizer complete all as specified and directed.

Supply and fix in repair of Dimmer gear assembly suitable for 40 to 200 KVA capacity servo type voltage stabilizer complete all as specified and directed.

S & F in repair of Panel lamp for servo type voltage stablizer 40 to 200 KVA capacity complete all as specified and as directed.

S & F in repair of Ampere meter of Range 0 to 500 Amps with suitable size of C.T. (Digital type) for servo type voltage stablizer 40 to 200 KVA capacity complete all as specified and as directed.

S & F in repair of Servo motor 10 K.G. torque for servo type voltage stablizer 40 to 200 KVA capacity complete all as specified and as directed.

S & F in repair of Carbon Brush for servo type voltage stablizer of any capacity complete all as specified and as directed

Material and labour for spreading of natural gravel nominal size not more than 50mm from the bay/yard manually without damaging any equipments, cable or parts of the 11 KV RMU/Transformers, spreading & levelling of finished gravel uniformaly in layers n. exc. 15 cm thick watered and rammed to true surface all as specified and directed

Labour only for re-spreading of old natural gravel of any size after screening from the bay/yard manually without damaging any equipments, cable or parts of the 11 KV RMU/Transformers, spreading & levelling of finished gravel uniformaly in layers n. exc. 15 cm thick watered and rammed to true surface all as specified and directed

M & L for prepration of old painted steel tubular pole 9 meter height by scraping with steel wire brush and cleaning the rust of pole and cross arm and applying two coat of Aluminium paint over and including a coat of red oxide primer above 1.5 m height and painting red and white strips ( 30 cm width ) with synthetic enemel paint upto 1.5 m height from bottom point, and writing the exhisting pole number with black paint in yellow circle of dia 150 mm , complete all as specified and as directed .

B.K. ROY & SONS

RAJENDER ENTERPRISES

BIDAWAT ENTERPRISES