REPAIR / MAINT OF VCB, TRANSFORMER HT UG CABLE O/H ACSR CONDUCTOR AND ALLIED WORKS AT AF STN DARBHANGA UNDER (GE) (AF) BIHTA

Amount

Surface dressing not exceeding 15 cm deep by cutting and removing green grass / bush / small plants / vegetation growth etc., levelling the areas , making good the disturbed surfaces , at various water / electric supply installations, sub station yards , around the poles etc including removing rubbish / surplush soil to a distance not exceeding 50 metre complete all as specified and directed by Engineer-in-Charge.

Excavating in trenches, not exceeding. 1.5metre wide and not exceeding 1.5metre deep and getting out in soft / loosecomplete all as specified and directed by Engineer-in-Charge.

Returning filling in foundation / trenches including spreading leveling, watering and well ramming in layers not exceeding 25cm thick in soil complete all as specified and directed by Engineer-in-Charge.

Removal of surplus excavated material to a distance n.exc. 50 metre and depositing where directed at a level n.exc. 1.5 metre above starting point complete all as specified and directed by Engineer-in-Charge.

Supply and spreading clean and dry screened sand (unwashed) in trenches around the cable for cushioning complete all as specified and directed by Engineer-in-Charge. Note :- Punned thickness shall be measured.

Providing, plain cement concrete 1:4:8 type D-2, (using 40 mm graded crushed stone aggregate) as in mass concrete, filling and foundation etc complete all as specified and directed.

Providing, plain cement concrete 1:3:6 type B1, (20mm graded crushed store aggregate) as in mass concrete, filling and foundation etc complete all as specified and directed.

Laying only in trenches dry well burnt bricks obtained in protections of cable laid flat perpendicular to the direction of cable over sand cushioning for protection of cable complete all as specified and directed.

Material and labour for synthetic insulating mat of size 2mX1mX19mm complete all as specified and directed by Engineer-in-Charge.

Material and labour for Insulator HT, 11000 volts grade, PIN type , of size 150 mm height and 150 mm dia , porcelain, vitreous, white or brown, including galvanised mild steel spindle, two galvanised iron washers and one galvanised iron nut complete all as specified and directed by Engineer-in-Charge.

Material and labour for HT, 11000 volts grade , DISC type insulator, single disc assembly, of size 145 mm height and 255 mm dia , ball and socket type, porcelain, vitreous, white or brown , for tension with tensile clamps for conductors complete all as specified and directed by Engineer-in-Charge.

Dismantling cross arm of MS channel or angle section from the pole complete all as specified and directed by Engineer-in-Charge.

Material and labour for cross arms, bracings, suports, clamps, back plates etc., fabricted with strututral steel sections including bolts, nuts, washers etc., welding , bending cold or hot,drilling holes for bolts,in any shape or size, complete all as specified and directed by Engineer-in-Charge.

Material and labour for danger Notice board , HT, 11000 volts , of size 25 Cm X 20 Cm, 1.6 mm thick, mild steel sheet , vitreous, enameled white with letters , figures and conventional skull and bones in signal red colour and fixed with clamps, bolts, nuts of approved size complete all as specified and directed by Engineer-in-Charge.

Material and labour for Lightning Arrestor , HT, 11000 volts, expulsion type,complete with all fittings, transmission class, discahrge capacity 65 Kilo Amps complete all as specified and directed by Engineer-in-Charge.

Dismantling of unserviceable worn out/weathered/damaged ACSR conductor, service feeder of any size from pole after disconnecting of jumpers and insulator bindings complete all as specified and directed by Engineer-in-Charge.

Material & labour for aluminium conductor steel reinforced (ACSR) including fixing, stretching on poles and proper noseling with binding wire with insulator of any size as required at site complete all as specified and as directed.

Labour only required for re-stretching/ restringing of existing loosed / sagged ACSR over head conductor of any type and size including supply and binding wire/aluminum tape of required size, opening from insulators as fixed on pole after taking proper electric shut down from concerned staff including taking down unserviceable conductor from OH line and proper binding with additional conductor and restringing on line, complete all as directed by Engineer-in charge.

Material and labour for Cradles hexagonalor rectangular fabricated with galvanised steel wires 4 mm or 3.15 mm dia for road crossings, between HT and LT conductors on same supports etc complete all as directed by Engineer-in charge.

Material and labour for painting of transformer 100 to 315 KVA, scrubbing out dust, dirt and oil from all places and applying two coats of grey synthetic enamel paint, writing MES/SM No etc complete all as specified and directed inluding taking down & refixing the same complete all as directed by Engineer-in-Charge.

Taking down/refixing defective transformer upto 315 KVA capacity and VCB from poles/structures after disconnecting all electrical connections removing to sub station/workshop as directed, placing the repaired transformer in place of taken down defective transformer including transportation, loading, unloading of transformer from sub station to work site/work shop and connecting HV and LV side including all connecting and jointing materials such as suitable size of lugs, bolts, nuts etc complete all as directed by Engineer-in-Charge.

Opening/striping off transformer 11 KV/0.433 KV step down capacity upto 315 KVA including draining off oil, lifting the core & coil assembly washing and cleaning dust, dirt and sludge deposit etc from all parts, removing damaged/defective parts requires replacement, making internal connection, servicing of tap changer and re assembling the transformer after repair and replacement work including new cork sheet gasket, packing, nuts, bolts, washer etc as required filling fresh transformer oil and testing complete including replacement of the following items:- (a) High voltage/low voltage coil including double paper insulated conductor of same gauge as per existing and all insulating material varnishing with vaccum impregnation and baking of coil suitable for 100 KVA capacities of step down transformers of aluminium/copper wound. (b) HV bushing of 12 KV grade with gasket complete. (c ) LV bushing of 1100 volts grade with gasket suitable for transformer upto 100 KVA capacity. (d) LV brass studs with brass nuts, check nuts, washers etc complete for transformers upto 100 KVA complete. (e) HV brass studs with brass nuts, check nuts, washers etc complete for transformers upto 100 KVA complete. (f) Replacement of breather with fresh filling of silica gel 0.5 Kg capacity in non metallic transparent enclosure for transformer up to 500 KVA capacity complete. (g) Insulating transformer oil conforming to IS-335 for filling/toping up of transformers not less then 100 ltr quantity duly filtered having dielectric breaking strength not less than 60 KV complete.

Maintenance and complete overhauling and calibraction of 11 KV VCB including dismantling of Vaccum intrrrupter bottel, trip coil,closing coil, Auxilary switch, spring limet switch,braker limet switch mechanical parts, well cleaning with petrol and CRC-226, replacing of moving parts, reassembly, fine setting of mechanism, replacement of unserviceable parts and reassembly of parts including well cleaning the complete panel board decarburization of all joints, metal parts and making VCB perfect operating condition including all routine and preventive maintenance complete all as specified and directed following part to be replaced :- (a) Voltage meter HT 1 No. (b) Amp meter 3 Nos (c) LED Indicator RYB (set) 3 Nos (d) 3ph overcurrent & earth Fault relay Art no 1MYN742838 make ABB - 02 Nos (e) Vaccum intrrrupter bottel (f) Trip coil, (g) Closing coil, (h) Auxilary switch, (j) Spring limet switch, (k) Braker limet switch (l) Relay Note :- Servicing of HT,11 KV,VCB, 50 Hz, breaking Capacity 630A , 20 KA trolly by drawing out from panel chamber including removing carbon deposits from moving/fixed contact points,greasing and tightening all fixed and moving contacts for smooth functioning including replacement of tripping and closing coils as per existing and servicing of solenoid switch all as specified and as directed.

Supply and filling of transformer oil EHV as per IS 335 of 1993 Part II. Note :- (i) Oil shall be brought in the manufacture sealed contrainer (drum) and shall be kept in safe custody of Engineer-in-Charge. (ii) Contractor shall hand over the purchase voucher and manufacturer's test certificate to the engineer in charge. (iii) Di-electric strength shall not be less than 60 KV AT 2.5 MM GAP

Dehydration of transformer oil both factory and site of work including heating, filtration, cleaning and testing required upto dielectric strength 60 KV in 4mm gap and testing of samples to the satisfaction of Engr-in-Charge and kept record of result before and after dehydration complete all as specified and as directed.

Cutting / pruning and removing tree branches close to the or touching the electric overhead lines HT / LT or at sub stations etc.,by climbing on the tree with necessary safety precautions, tools etc.,removing , transporting the cut branches from site and depositing where directed at a distence not exceeding 300 mtr. All as specified and as directed. Note :- (I) Proper Shut down of electric supply shall be taken before climbing trees. (ii) Any damage to existing OH lines / services etc shall be made good without any extra cost to Govt.

Material and labour for cleaning and preperation of surfaces, by scrubbing with wire brushes, emery papers etc., from all metalic surfaces of MS tubular HT electric double pole structure, any type / model, each pole not more than 11 mtr. heigh above ground level , comprising standard type / size / length cross arms, supports, bracings,clamps , AB switche, Lightning Arrestors, HG fuse units, etc., any size , on the same structure and applying one coat of aluminium paint on pole,cross arms, clamps, GI pipes brackets etc., including writting of pole number by paint complete all as specified and as directed by Engineer-in-Charge.

Material and labour for cleaning and preperation of surfaces, by scrubbing with wire brushes, emery papers etc., from all metalic surfaces of MS tubular HT electric poles , any type / model, not more than 11 mtr. long above ground level , including cross arms, clamps etc., any size , on the same pole applying one coat of aluminium paint on pole,cross arms, clamps, GI pipes brackets etc., including writting of pole number etc., by paint complete all as specified and as directed by Engineer-in-Charge.

Material and labour for Air break gang operated switch , HT, 11000 volts,Triple pole mechanically operated, vertical/horizontal ,mounted on insulators and steel frames with operating mechanism worked from ground level with operating rod, handle etc. for current rating up to 400 Amps,fixed on pole / stuctures complete all as specified and as directed by Engineer-in-Charge.

Supply, laying & testing cross linked polyethylene insulated (XLPE) galvanised steel strip armoured cable with aluminum conductor, 11 KV `E’, of cross sectional area 185 Sqmm, three core (IS-7098) in trenches/through pipes/ducts or on poles at crossing of OH lines of MES and road crossing including taking out of old Cable complete all as specified and directed by Engineer-in-Charge. Note :- (i) Excavation, earthwork, cable protection cover, cable joint, sand cushioning shall be measured and paid for separately under respective item of this schedule. (ii) Old cable, cable joint, brick cover, pipe etc shall be contractor property and necessary amount as per schedule of credit shall be deducted from contractor's due payments.

Material and labour for cable jointing kit for 11 KV (earthed) heat shrinkable, straight through joint suitable for cross sectional area 185 Sqmm, 3 core aluminium conductor XLPE Cable including jointing material and accessories including cutting of old cable complete all as specified and directed by Engineer-in-Charge. Note:- (i) Fault location shall be detected and cost of same shall deemed to be included in the quoted rate including necessary earth work.

Material and labour cable jointing kit for 11 KV (earthed) heat shrinkable, out door termination suitable for cross sectional area 185 Sqmm, 3 core aluminium conductor XLPE Cable including jointing material and accessories complete all as specified and directed by Engineer-in-Charge.

Material and labour cable jointing kit for 11 KV (earthed) heat shrinkable, in door termination suitable for cross sectional area 185 Sqmm, 3 core aluminium conductor XLPE Cable including jointing material and accessories complete all as specified and directed by Engineer-in-Charge.

Material and labour for cable jointing kit for 11 KV (earthed) heat shrinkable, straight through joint suitable for cross sectional area 35 Sqmm, 3 core aluminium conductor XLPE Cable including jointing material and accessories including cutting of old cable complete all as specified and directed by Engineer-in-Charge. Note:- (i) Fault location shall be detected and cost of same shall deemed to be included in the quoted rate including necessary earth work.

Material and labour for cable jointing kit for 11 KV (earthed) heat shrinkable, straight through joint suitable for cross sectional area 50 to 95 Sqmm, 3 core aluminium conductor XLPE Cable including jointing material and accessories including cutting of old cable complete all as specified and directed by Engineer-in-Charge. Note:- (i) Fault location shall be detected and cost of same shall deemed to be included in the quoted rate including necessary earth work.

Material and labour Earthing complete with galvanised steel earth plate electrode 600x600x6mm thick directly burried in ground (earth pit not less than 2.25 m deep below ground level) with top edge of earth plate not less than 1.5metre below the ground level connected to GI strip 25x4 mm by means of bolts nuts check nuts and washers of galvanised iron at 2 points & GI pipe 40 mm bore medium grade for protection of earth strip, GI pipe 20 mm bore medium grade for watering PCC chamber 1:3:6 (type C-1) using 20mm graded stone aggregate, funnel with wire mesh, 50 mm thick cover of RCC 1:2:4 type B-1 using 20mm graded stone aggregate reinforced with 8 mm MS bars at 150 mm centre to centre both ways, CI frame and charcoal dust and common salt, all as shown in electrical plate No. 3 of MES SSR part-I and making test point as specified including excavation & earth work in any type of soil and connecting the earthing to an earthing point/equipment as specified and directed & testing on completion. NOTES : (i) The concrete pit shall be made in PCC 1:2:4 type B-1, using 20mm graded crushed stone aggregate 40mm thick precast cover slab of RCC (1:2:4), type B-1, using 20mm graded crushed stone aggregate with suitable MS handle in lieu of CI cover. (ii) Item includes the cost of 7.5 metre GI pipe for protection of earth strip. Any variation in length shall be adjusted through deviation order (iii) Items includes cost of 7.5 metre earth lead strip. Any variation in length shall be adjusted through deviation order. (iv) Earth electrode shall be surrounded by adequate quantity of charcoal dust and salt to a packed thickness of 15 cm on all sides

Dismantling stay assembly complete all as specified and directed by Engineer-in-Charge.

Material and labour for stay assembly 20 mm dia complete with accessories as shown in electrical plate No. 1 complete all as specified and directed. Note : - Loop type insulator, stay clamps, excavation and concrete shall be measured and paid separately in respective item of this schedule.

Material and labour for repair/replacement for brazing of earth continuity conductor or main earthing lead 25mm X 3mm, aluminum strip/earth lead, in any position including jointing by existing tinned copper/brass nuts, bolts and washers complete all as specified & directed. Note:- (i) Each joint shall be considered for measurement purpose. (ii) Existing nut bolts & washers shall be reused for jointing of strips. (iii) Brazing shall be done with gas welding using brass electrode.

Dismantling of unserviceable steel tabular (HT) poles any size.

Material and labour preparing new steel surfaces of any description not otherwise described over 10 cm width or girth and applying two coat of synthetic enamel paint over a coat of red oxide primer complete.

B.K. ROY & SONS

Rekha Enterprises