REPAIR AND MAINTENANCE OF HT SWITCH GEAR AND POWER DISTRIBUTION TRANSFORMER AND OTHER CONNECTED WORKS AT AF STN NAL

Amount

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.

Material and labour well burnt old size sub Class ‘B’ bricks, laid flat, in trenches for cable protection complete all as specified and as directed.

Taking out HT un-serviceable / faulty cable of Cross sectional area 95 sq mm, 3 core from trench / pole / cable duct carefully incl bricks, pipe and stacking properly for disposing off from site or for relaying in same place complete all as specified and as directed. Note : (i) Excavation and earth work shall be measured and paid separately. (ii) Unit rate of this item include the cost of taking out brick protection/ tiles and GI Pipe etc as applicable. (iii) Old serviceable cable shall be stored properly for relaying and unserviceable cable to be taken by contractor against schedule of credit and to be disposed from site.

All as per description of serial item No. 6.00 here in before but cable of cross sectional area 120 sqmm, 3 core complete all as specified and as directed.

Laying only serviceable old bricks retrieved from item No 6 and 7 above comlete all as specified and as directed.

Laying only, including testing of HT serviceable PVC / XLPE insulated 11000 Volts grade aluminium conductor cable Cross sectional area 95 sq mm, 3 core in trench or fixed to wall /passing through pipe / pole complete all as specified and as directed. Note : (i) Old serviceable cable retrived under Item No. 6.00 here-in-before shall be used in the work. (ii) Brick protection, concrete cable cover, sand cushioning shall be measured and paid for separately.

Laying only, including testing of HT serviceable PVC / XLPE insulated 11000 Volts grade aluminium conductor cable Cross sectional area 120 sq mm, 3 core in trench or fixed to wall /passing through pipe / pole complete all as specified and as directed. Note : (i) Old serviceable cable retrived under Item No. 7.00 here-in-before shall be used in the work. (ii) Brick protection, concrete cable cover, sand cushioning shall be measured and paid for separately.

Supply, laying and testing XLPE insulated, armoured 11000 Volts grade aluminium conductor cable, Cross sectional area 95 sq mm, 3 core, as per IS-7098 (Part-II), in trenches or fixed to wall /passing through pipe / pole, as directed for the following cross sections. Note : (i) Excavation and earth work shall be measured and paid for separately. (ii) Cable cover protection and sand cushining shall be measured and paid for separately. (iii) Pipe including clamps shall also be measured and paid for separately.

All as per description of serial item No. 11.00 here in before but cable of cross sectional area 120 sqmm, 3 core complete all as specified and as directed.

Material and labour straight through joint HT 11000 volts, grade heat shrinkable of cable Cross sectional area 50 Sqmm, 3 core complete all as specified and as directed. Note : Excavation & earthwork shall be measured and paid for separately

All as per description of serial item No. 13.00 here in before but for cable of cross sectional area 70 sqmm, 3 core complete all as specified and as directed.

All as per description of serial item No. 13.00 here in before but for cable of cross sectional area 95 sqmm, 3 core complete all as specified and as directed.

All as per description of serial item No. 13.00 here in before but for cable of cross sectional area 120 sqmm, 3 core complete all as specified and as directed.

Supply and fixing End termination joint (Out door type) heat shrinkable HT 11000 volts grade of cable Cross sectional area 70 Sqmm, 3 core complete all as specified and as directed.

All as per description of serial item No. 17.00 here in before but for cable of cross sectional area 95 sqmm, 3 core complete all as specified and as directed.

All as per description of serial item No. 17.00 here in before but for cable of cross sectional area 120 sqmm, 3 core complete all as specified and as directed.

Material and labour End termination joint (Indoor type) heat shrinkable HT 11000 volts grade of cable Cross sectional area 70 Sqmm, 3 core complete all as specified and as directed.

All as per description of serial item No. 20.00 here in before but for cable of cross sectional area 95 sqmm, 3 core complete all as specified and as directed.

All as per description of serial item No. 20.00 here in before but for cable of cross sectional area 120 sqmm, 3 core complete all as specified and as directed.

Supply and fixing GI tubing light grade 80 mm bore for cable protection complete all as specified and as directed. Note:- Cost of taking out of pipe included in unit rate for taking out cable here-in-before.

All as per description of serial item No. 23.00 here in before but 100 mm bore pipe complete all as specified and as directed.

Tracing out fault in 11 KV underground cable any size with the help of fault tracing machine and rectifying the same with joints as specified and directed to restore the supply complete all as specified and as directed. Note: (i). Joint kit shall be measured and paid separately. (ii) Earth work shall be measured and paid separately. However, width of trenches shall be allowed for payment as per authorized width given in SSR for each size of cable. (iii) All other necessary arrangements suitable for locating the faults deemed to be included in the unit rate quoted. (iv) T&P required for the entire job shall be provided by the contractor at his own end and nothing extra shall be admissible on this account. (v) Cable required, if any shall be measured and paid for separately. (vi) Fault & location thereof shall be traced within 12 hours of intimation by the Engineer-in-Charge and shall be rectified within given time frame

Material and labour for Servicing of 33 KV Potential Transformer, cleaning of core, checking of all connections replacement of oil and testing of all connections complete all as specified and as directed. Note:- Oil shall be measured and paid for separately under respective item of this Schedule.

Material and labour for Servicing of 33 KV Current Transformer, cleaning of core, replacement of oil (40 Ltr), testing of all connection complete all as specified and as directed. Note:- Oil shall be measured and paid seperatly under respective item as 'Supply only'.

Supply and filling transformer power oil meeting IEC 60296-2003-11, 3rd edition standard specification and ASTMD 1275B test requirements for corrosive sulpher of BDV not less than 65 KV for topping up the Power/distribution transformer HT 33 KV / 11 KV. NOTE:- Transformer oil shall be brought by the contractor in sealed standard packing in barrell of 210 ltrs capacity. Contractor shall produce the original purchase vouchers and test certificate from the manufacturer.

Material and labour for filteration and dehydration of transformer oil by dehydration machine to achieve the die-electric strength / insulation value upto 65 KV/40KV (RMS) at standard gap of electrodes 2.5 mm for one minute in various capacity of transformers 33/11KV and 11/0.433KV including insulation testing of oil with help of suitable equipments before and after dehydration including BDV Test complete all as specified and as directed.

Supply and fixing as in repairs PG clamp die cast aluminium of suitable size and for fixing clampling ACSR conductor connections for PT's CTs isolators complete all as specified and as directed.

Disconnecting, opening of indoor type VCB (Make : Crompton / Megawin / Yamuna Denson / ABB Ltd, Alsthom) of any description and any make of rating 11 KV 400/630/800 Amps capacity for servicing / overhauling, taking out and removing unserviceable / defective parts including cleaning & servicing, greasing, oiling of the parts etc and replacement of unserviceable parts with new one, reassembling the VCB after overhauling/ servicing and its testing complete all a specified and as directed. Note: (i) Replacement of unserviceable parts shall be measured and paid separately under relevent item of Sch 'A' as supply only but fixing charges of the parts replaced /repaired is deemed to be included in the item rate. (ii) Servicing shall be got carried out by the authorised rep of the VCB manufacturer and the service engineer will submit a service report and calibration certificate for each VCB. (iii) Any item not included in CA and required for successful operation of the panel will be provided by the contractor & same shall deemed to be included rate quoted.

Supply only following parts suitable for 11KV VCB, 400/630 Amps capacity of Make : Crompton/Megawin/Yamuna Denson/ABB Ltd, Alstom) dismantled / fixed under Sch 'A' item No: 31 here-in-before complete all as specified and as directed.

Isolating contact assembly 400/630/800 Amps suitable for 11 KV/400/630/800 Amp VCB Panel

Tripping Coil assembly 24/30 Volts DC suitable for 11 KV VCB Panel

Close Coil assembly 24/30 Volts DC suitable for 11 KV VCB Panel

TNC switch for 11 KV VCB Panel

Indication lamp LED type suitable for 230 Volts AC 50Hz and 110/30 Volts DC supply.

Supply only HRC fuse 11 KV grade 5 Amps.

Material and labour for testing and calibration of 11KV VCBs (Make : Crompton / Megawin / Dension / ABB Ltd, Alstom) indoor type alongwith control panel and control wiring, protection system and relays system (relay to tripping coil auxiliary switch male and female housing cut outs etc) , checking of quality of vacuum interrupter, insulation resistances, static contact resistance, Testing (IR value, Ratio test, Polarity test) and connection verification of 11 KV Current transformer (Set of three) by PRIMARY INJECTION KIT and Testing and calibration of relay (set of two Over current and one earth fault) by SECONDARY INJECTION KIT including all other functional tests of the VCB, C&R panel and CTs, PTs. complete all as specefied and as directed.

Material and labour for servicing testing and calibration of 11KV SF6 circuit breaker/ 1 Way 400/630 Amp (Make : CG Lucy/ Crompton/Megawin/ Dension/ABB Ltd, Alstom) indoor type alongwith control panel and control wiring, protection system and relays system (relay to tripping coil auxiliary switch male and female housing cut outs etc) , insulation resistances, static contact resistance, Testing (IR value, Ratio test, Polarity test) and connection verification of 11 KV Current transformer( Set of three) by PRIMARY INJECTION KIT and Testing and calibration of relay (set of two Over current and one earth fault) by SECONDARY INJECTION KIT including all other functional tests of the RMU CR panel and CTs, PTs. complete all as specefied and as directed.

All as per description of serial item No. 34.00 here in before but 3 way RMU having 2 Nos I/C and one No out going complete all as specefied and as directed.

Material and labour for repair to distribution transformer step down 11/0.433 KV indoor/outdoor type of capacity up to 250 KVA, by 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 LT & HT bushes, cutting the burnt out winding and re-winding the same with suitable size of super enamelled copper wire as per existing guage, insulating the winding connection by using fire proof sleeve 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 of MES/SM Number etc, replacement of conservator tank glass, re-installing the core and winding inside properly, making the all connection with suitable copper lugs, filling of new transformer oil, reinstalling the top cover after cleaning and painting of housing, conservator tank, explosion vent etc, Meggering the LT and HT side of the Transformer and testing complete all as specified and directed. Note :- (i) Winding wire for making of coils, HT/LT bushes, new transformer oil will be measured & paid for seperately (ii) Contractor is required to submit test report for repaired transformer duly signed by Engineer-in-Charge before installation.

All as per description of serial item No. 36.00 here in before but capacity of transformer 11 / 0.433 KV, above 250 KVA upto 630 KVA complete all as specified and as directed.

Supply only brass terminal rod with nuts, bolts washers & bushings suitable for HT and LT side of the transformer of any make and capacity upto 250 KVA complete all as specified and as directed.

All as per description of serial item No. 38.00 here in before but capacity of transformer exceeding 250 KVA but not exceeding 400 KVA complete all as specified and as directed..

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

Material and labour for making cable duct in power houses located at various location of Tech Area Demestic area by cutting existing floor for size width 450 mm x depth 600 mm (internal dimension of duct) depth of duct to be reckoned from the top of PCC in foundation to top existing floor as 600 mm and including duct cover of suitable size with 3 mm thick MS chequred plate cover and frame of angl iron 40 mm x 40 mm x 6 mm with fixing arrangement and painting two coat of synthetic enamel paint over a coat of red oxide primer on MS chequred plate and frame, including necessary dismantling of existing floor, excavation and earth work in hard/ dense soil, returning, filling in approved soil disposal of surplus soil to a distance not exc 50 mtr ,150 mm thick PCC (1:3:6) type C-1 using 20mm graded stone aggregate as in faondation, 100 mm thick PCC (1:3:6) type C-1 using 20 mm graded stone aggregate as in wall, 10mm thick plaster in cement motar 1:4 internally complete all as specified and as directed. Note:The rate quoted by the contractor is including making good the disturbed floor matching to the existing floor.

Taking down old unserviceable GI plate earthing and material and labour as in repair for earthing complete with copper earth plate electrode 600 mm x 600 mm x 3.15 mm thick, burried directly and preferably vertically in ground , earth pit not less than 3.00 mtr deep below ground level with top edge of the plate not less than 2.40 mtr below ground level. The earth plate to be connected with copper earthing strip of size 20 mm x 3 mm thick by means of brazing between copper strip and earth plate min 45 cm in vertical length and copper strip also to be joined by brazing only. The copper earthing strip to be protected by galvanlsed iron pipe 40 mm bore (medium grade) upto ground level and there after with 40 mm dia HDPE pipe upto test point. Earthing shall be included with providing funnel with 20 mm bore galvanised iron pipe (light grade), wire mesh , charcoal or coke and common salt in alternate layer of 15 cm (compacted thickness) upto 90 cm all round earth plate further filled with 60 cm thick Tibba sand and second layer with 30 cm of Magnesium Sulphate powder ( compated thickness) 3rd layer with Tibba sand up to the ground level. Earthing shall also be include for providing concrete earth pit in PCC (1:3:6) type C -1 (with 20mm grade aggregate), 50 mm thick precast RCC (1:2:4) cover slab (re inforced with Excavation, returning filling and removal of surplus soil upto a distance not exceeding 50 mtr etc all as shown on electrical Plate No 3 of MES schedule Part I complete to obtain less than 2 Ohm earth recistance value , complete all as spcified. Note :- Plate No 3 of SSR Part I is given is given for guide of earth chamber.

Material and labour for PCC 1:4:8 type D2 using 40 mm graded stone aggregate as in foundation for poles, filling of mass concrete complete all as specified and as directed

Surface excavation n.exc 30 cm deep & averaging 15cm deep & getting out in soft loose soil.

Material and labour for chequered cement concrete coloured tiles 25cmX25cmX25mm thick set and jointed and pointed in neat cement slurry with grey cement and pigment over and including 15mm thick screed in CM 1:6 complete all as specified and as directed.

M/s Rohit Construction Co.

B.K. ROY & SONS

BIDAWAT ENTERPRISES