SPECIAL REPAIR TO HT EQUIPMENT DISTRIBUTION TRANSFORMER AND CONNECTED WORKS AT AIR FORCE STATION CHANDIGARH UNDER GE (AF) MC CHANDIGARH

Amount

Excavation in trenches in soft/loose soil not exceeding 1.5 metre wide and not exceeding 1.5 metre deep for laying/taking out of cables and foundation of poles etc. and getting out including cutting of bushes and grass complete all as specified and directed. Note:-(i) Excavation shall be made carefully in order to avoid damage of existing cables and protection covers. (ii) The excavation work shall be carried out in short lengths for locating fault in under ground cables at different locations.

Returning, filling in trenches (soil), including spreading, leveling and well ramming in layers not exceeding 25 cm thick complete all as specified and directed.

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

Material and labour for sand cushioning with a layer of dry river sand, 80mm thick before laying of cable and 150mm thick (punned down to 100mm thick) after laying of cables, in trenches/ducts, complete all as specified and directed. Note : Punned down thickness (overall 18cm), shall be considered for measurement and payment.

Supplying & laying (laid flat, width of protection being equal to length of cover) un-reinforced pre cast flat concrete cable protection cover of class HV, type- I, size 300mm x 180mm x 40mm, factory made (ISI Marked) as approved by GE complete all as specified and directed.

Taking out GI pipe light grade100/80mm dia from tranches/ poles/floor complete all as specified and directed.

Supply,laying and fixing ISI marked GI pipe light grade 100 mm dia bore for LT/ HT cable protection laid under trench/road/path/ culvert or fixed on wall/pole/MS channel etc complete with nuts, bolts, clamps complete all as specified and directed.

Supply,laying and fixing ISI marked GI pipe light grade 80 mm dia bore for LT/ HT cable protection laid under trench/road/path/ culvert or fixed on wall/pole/MS channel etc complete with nuts, bolts, clamps complete all as specified and directed.

Taking out the existing unserviceable HT cable upto 240 sqmm complete all as specified and directed.

Supply, laying, jointing, testing and commissioning of High Tension (HT), 11000 Volts (earthed) grade, XLPE insulated, screened, PVC bedded, galvanized steel strip or wire armoured, electric power cable (heavy duty) with stranded aluminum conductor, cross sectional area 185Sqmm, 3 core under ground cable including both side connection with cable lugs etc, laid in trenches, along poles or passing through pipes or laid under floor or through walls etc. complete all as specified and directed. Note : Excavation and earth work, sand cushioning and precast concrete cable cover for protection of cable shall be measured and paid separately under respective item of this schedule.

Supply, laying, jointing, testing and commissioning of High Tension (HT), 11000 Volts (earthed) grade, XLPE insulated, screened, PVC bedded, galvanized steel strip or wire armoured, electric power cable (heavy duty) with stranded aluminum conductor, cross sectional area 240 Sqmm, 3 core under ground cable including both side connection with cable lugs etc, laid in trenches, along poles or passing through pipes or laid under floor or through walls etc. complete all as specified and directed. Note : Excavation and earth work, sand cushioning and precast concrete cable cover for protection of cable shall be measured and paid separately under respective item of this schedule.

Supply, jointing & testing, indoor end termination joint kit (Cold shrinkable) complete with jointing material and accessories suitable for 3wire, 11KV (earthed) grade, HT, underground XLPE insulated armoured aluminium conductor, 3 core, 185Sqmm size cable, complete all as specified and directed.

Supply, jointing & testing, indoor end termination joint kit (Cold shrinkable) complete with jointing material and accessories suitable for 3wire, 11KV (Earthed) grade, HT, underground XLPE insulated armoured aluminium conductor, 3 core 240Sqmm size cable, complete all as specified and directed.

Supply, jointing & testing, outdoor end termination joint kit (Cold shrinkable) complete with jointing material and accessories suitable for 3wire, 11KV (Earthed) grade, HT, underground XLPE insulated armoured aluminium conductor, 3 core,185 Sqmm size cable, complete all as specified and directed.

Supply, jointing & testing, outdoor end termination joint kit (Cold shrinkable) complete with jointing material and accessories suitable for 3wire, 11KV (Earthed) grade, HT, underground XLPE insulated armoured aluminium conductor, 3 core 240 Sqmm size cable, complete all as specified and directed.

Dismantling of MS cross arms, bracing, supports, clamps and back plates, fabricated from structural including nut/bolts washer etc. complete all as specified and directed.

M&L for MS cross arms, bracing, supports, clamps and back plates, fabricated from structural steel section Fe-290 grade E-165 quality including nuts, bolts, washers, and welding, bending cold or hot, drilling holes for bolts in any shape or size as directed including two coats of alminium paint over a coat of red oxide primer complete all as specified and directed.

Dismantling air break gang operated switches vertical/horizontal mounted including insulators and operating mechanism for repair/ replacement of broken/worn out components and insulators etc.complete all as specified and directed.

Dismantling of existing PCC pole 11 meter long including demolition of PCC foundation and setting aside complete all as specified and directed. Note:- Cost for making good the disturb surface including necessary earth work shall deemed to be included in the quoted rate against this item.

M&L for switch air break, triple pole, gang operated (GOD), copmplete 15 insulators with drop out fuse unit mechanically operated, mounted on insulators and steel frame, non-ferrous knife and spring loaded contacts, arcing hours of adequate sections to break magnitising current of the transformer, with operating mechanism worked from ground level, for current rating upto 200Amps suitable for 11000 volts grade, AC supply complete all as specified and directed. Note:- All ferrous parts shall be hot dipped galvanised and non-ferrous parts shall be heavily dipped to withstand weather.

M&L for switch air break, triple pole, gang operated (GOD), copmplete 15 insulators with drop out fuse unit mechanically operated, mounted on insulators and steel frame, non-ferrous knife and spring loaded contacts, arcing hours of adequate sections to break magnitising current of the transformer, with operating mechanism worked from ground level, for current rating upto 400Amps suitable for 11000 volts grade, AC supply complete all as specified and directed. Note:- All ferrous parts shall be hot dipped galvanised and non-ferrous parts shall be heavily dipped to withstand weather.

M&L in replacement of earthing complete with GI earth plate electrode of size 600mm x 600mm x 6mm thick burried directly in ground vertically (depth of pit not less than 2.25m below normal ground level), with top edge of earth plate not less than 1.5m below normal ground level, earth plate surrounded from all sides by 15cm thick packed alternate layers of charcoal dust and common salt, electrode connections using galvanized iron strip of size 32 mmx6 mm thick (upto body of equipment) by means of nuts, bolts, check nuts & GI washers, connected to main switch board or main control board or test point, protected by galvanized iron pipe light grade 40mm dia bore, and watering pipe 20mm dia bore GI light grade with funnel & wire mesh including all necessary excavation & earth work, PCC chamber in PCC (1:2:4) type B-1 & RCC cover, all as shown in electrical plate No 3 of MES Schedule Part-I (2009), testing on completion, complete all as specified and directed. Notes :- (i) RCC pit cover shall be pre-cast of RCC (1:2:4) type B-1, 80mm thick reinforced with XPM not less than 4Kg/Sqm. (ii) PCC chamber shall be constructed 500 mm away from the edge of earth pit. (iii) Rate shall include GI strip and protection pipe of length 7.5m, excess beyond 7.5m length required at site shall be measured and paid separately. (iv) Earth resistance should be less than 3Ohm. In case the test results are not found below 3 Ohm, complete earthing will be redone by the contractor without any extra cost to Govt.

M&L for in replacement of earth continuity conductor or main earthing lead or lightning conductor, 32mmx6m GI strip, fixed to wall on batten with saddles and fixing screws, PVC/ porcelain insulators etc. or recessed or chases or burried in ground or drawn in and including PVC heavy duty rigid conduit and GI pipe light grade of adequate size to fixed to poles or any other indicated situation for loop earthing etc. as required complete all as specified and directed.

M&L for in replacement of 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 of size 25 x 20cm size including taking out old & removal complete all as specified and directed.

M&L for replacement of existing HT bus bar insulators epoxy type 130mm x 70 mm size, 11000 volts grade.complete all as specified and directed.

M&L for opening of HT 11KV VCB front and back side complete after taking shutdown for servicing , cleaning, dusting inside & out side of VCB greasing oiling the mechanical parts of VCB and other parts of VCB as per required at site and including caliberation , setting of relays etc. and testing complete all as specified and directed.

M&L for opening 11KV, VCB of RMU front and back side complete after taking shut down servicing , cleaning, dusting inside & out side of RMU greasing oiling the mechanical parts of RMU and other parts as per requirement at site and including testing complete all as specified and directed.

Disconnecting electric supply from main breaker, taking out ACB 800 to 1000 Amp for replacement of the parts under srl item No-28.01 to 28.09 complete all as specified and directed.

Supply only microprocessor based OCR (IPR) complete all as specified and directed. Make:-Havells Code no. ISACX0214/ABB/Schinider

Supply only spring charging motor complete all as specified and directed.Make:-Havells Code No. ISACX0147/ABB/Schinider

Supply only neutral CTs complete all as specified and directed. Make:- Havells code No.ICELFACL013/ABB/Schinider

Supply only under voltage trip device complete all as specified and directed. Make:-Havells Code No ISACX0196/ABB/Schinider

Supply only adaptor type terminals complete all as specified and directed.Make:-Havells Code No ISSACX0174/ ABB/Schinider

Supply only spring charge indication switch complete all as specified and directed. Make:-Havells Code No ISACX0207/ABB/Schinider

Supply only position indication switch complete all as specified and directed. Make:-Havells Code No- ISACX0182 / ABB/Schinider

Supply only main CTs complete all as specified and directed.Make:-Havells Code No- ISACX0182 ICELFACL002 Equivalent ABB/Schinider

Supply only shunt trip/closing coil complete all as specified and directed. Make:-Havells Code No-ISACX0182ISACX0167/ABB/Schinider

M&L for hardcore of guage exc 63mm but n exc. 100 mm, deposited, spread and levelled in layers n exc. 15 cm thick, watered and rolled/rammed to a true surface filling in four pole structure for transformer area complete all as specified and directed.

M&L for MS work for fabcrication of plates (chequered )channels, square cut or notched (ordinary and counter sunk) forming holes, without any attachment Fe 410 -W (Gde E- 250) quality A of minimum thickness 6 mm including necessary supports, hangers ,nuts, bolts and washers and one coat of priming with red oxide zinc chrome lead & two coat of black bituminous paint etc complete all as specified and directed.

Supply and laying High voltage Insulating ELECTROMAT of thickness 3 mm ISI marked for system volatage 11 KV and breakdown volatage 65 KV made of elastomeric polymers material having high insulation resistance of size 1 Mtr x 5 Mtr as per IS 15652 : 2006.complete all as specified and directed.

Supply and fixing HT cable route indicator/ joint marker made of size 10 cm x 10 cm x 90 cm out of precasted with bar size 8 mm dia 04 Nos ,8 mm strips 100mm c/c ,plaster work including paint of red colour complete in route marker and black paint in letters of height 50 mm HT route marker duly grouted in PCC 1:2:4 type B1 using 20mm graded stone aggregate of size 30cmx30cmx20cm bed block including all necessary earthwork or formwork if required complete all as specified and directed.

Supply, Installation, testing & commissioning of 12 KV Ring Main unit, outdoor type extensible, with IP 54 standard protection fully type tested according to IEC-62271 standards ,insulated with SF-6 gas ,Configuration- 4- way- 11KV Gas (SF6) Insulated RMU with two Nos 630A motorised operated Load break switches and two Nos VCB, 630 Amps "T" OFF circuit breaker complete with TPN copper bus bar of 630 Amps rating insulated with epoxy resin, microprocessor based over current and earth fault self powered relay (Make : ASHIDA/C&S/MICOM) , 11 KV CT of ration 50/1/1- 03 Nos in each VCB for metering and protection with 5 VA burden with accuracy class 0.1 and PT of ratio 11KV/√3/110V/√3. Burden : 10 VA accuracy class 0.2-03 Nos, mechanical and electrical interlocking feature, metering instruments digital type ( Volt meter 0-20 KV , Ammeter 0-100 Amps with following specifications. '(a) SYSTEM PARAMETER:- (i) System voltage - 11 KV 3 phase (ii) Rated voltage - 12 KV (iii) Short time current rating – 21KA for 3 sec (iv) Rated short circuit PF with stand voltage- 28 kv RMS (v) Rated lightning impulse with stand voltage -75 kv peak (vi) System earthing ; Solidly earthed. (vii) Rated lightning impulse with stand voltage -75 kv peak (viii) Enclosure - IP-67(HV). (ix) Internal arc fault with stand capacity - 21 KA for 03 sec. '(b) CIRCUIT BREAKER INFORMATION:- (i) Reference IEC standard : IEC: 62271 - 100 (ii) Type of breaker - Vacuum circuit breaker (iii) Rated/Max voltage - 12 KV (iv) Rated current - 630 amps (v) Rated short circuit current - 21 KA for 3 sec (vi) Trip free anti pumping design – yes (vii) Position indication – aux switch, (viii) Control Power voltage range for trip coil and closing coil – 85%-110% (ix) Aux contact : 4 NO + 4 NC (x) Aux contact current rating - 10 Amps (xi) Control power voltage range motor – 85% -110%for spring charged mechanism. (xii) Spring charged after closing/opening - Yes (xiii) Control power voltage range motor – 85% - 110% (for spring charging mechanism) (xiv) Internal overpressure release device - pressure relief valve (xv) Nos of opening/closing of contacts without recharging - 01.

Disconnecting defective outdoor/ indoor power distribution transformer of capacity 300 KVA to 400 KVA from HT/ LT sides draining out complete transformer oil & storing the same in suitable containers ( to be arranged by contractor ) opening the top cover and lifting up the core assembly carefully to check the condition of transformer winding core retanking the same after repair/rewinding , filling of new transformer oil including checking of leakage of transformer body and welding works required for making transformer body leak proof, replacement of HT/LT side porcelain bushing , HT /LT side bushing rod made of brass/copper of appropriate curent rating , body gasket , replacement of old breather with new breather of transparent body filled with new silica gel , transportation of transformer to and fro from site to work shop and re-installation the same at any site complete all as specified and directed. Note:- New Transformer oil shall be measured and paid separately. Cost of gasket , bushing, bush rods ,breather with silica gel, nut bolts and washers is deemed tobe included in the quoted rates of this item.

M&L for replacement of burnt /defective HT(Primary) copper coil with new one made out of super enamelled heavy duty copper wires of size matching to the existing one including varnishing, drying and insulating material in transformer complete all as specified and directed.

M&L for replacement of burnt /defective LT (Secondary) copper coil with new one made out of super enamelled heavy duty copper wires of size matching to the existing one including varnishing, drying and insulating material in transformer complete all as specified and directed.

M&L for painting of transformer of 300 KVA to 400 KVA capacity with good quality synthetic enameled paint using spray gun with compressed air on complete external portion of transformer including preparation of surface by scrubbing, cleaning ,stains greasy spots, dusts etc, including writting SM/MES number complete all as specified and directed.

Supply and filling transformer oil new filling, having dielectric strength 50 - 60 KV during filling after initial filteration, conforming to relevent IS-335 complete all as specified and directed. Note:-Transformer oil to be supplied in sealed container and ISI marked.

R D Bansal

Electromech Engineers