REPAIR AND MAINT OF TRANSFORMER, VCBs AND CONNECTED ITEMS AT MIL STATION KASAULI, DAGSHAI AND SOLAN UNDER GE KASAULI

Amount

Excavation in trenches not exceeding 1.5 meter wide and not exceeding 1.5 meter in depth for foundation of poles/laying of under ground cables etc and getting out in hard/dense soil complete all as specified and as directed.

Excavation in trenches n.exc 1.5m wide and n.exc 1.5m in depth and getting out in soft disintegrated rock (considered for road cutting) complete all as specified and as directed

Returning, filling in including spreading, levelling, watering and well ramming in layers n.exc 25cm thick complete all as specified and as directed.

Removing excavated material n.exc 50m and depositing where directed at a level n.exc 1.5m above the starting point complete all as specified and as directed.

Graded coarse aggregate of nominal size 40mm, indoor/outdoor substation/ 2 pole/4 pole structure boundary all as directed

Double wall corrugated HDPE duct pipe 110mm outer dia confirming to IS: 14930 (Part-II) of approved colour with fittings for cable protection complete all as specified and as directed.

Taking out old under ground HT XLPE/PVC cable of any size for found out fault from trenches/wall/roof/road/pipe/pole including taking out of brick layer and segregation/stacking of serviceable brick from trenches for reuse and broken brick bats removing from site complete all as specified and as directed (Excavation, earth work shall be measured and paid for separately under appropriate item).

Re-Laying only old serviceable cable (cable obtained from item taking out old cable here-in-before after checking the fault) under ground HT XLPE/PVC cable 11000 Volt grade of any size in trenches/fixed to wall/pole/roof laid in floor including necessary connections and suitable size of thimbling complete all as specified and as directed.

XLPE insulated, screened, PVC bedded, galvanised steel strip armoured, overall PVC sheathed electric power cables (heavy duty) with aluminium conductor, 11000 volts grade (Earthed) cross sectional area 95 Sqmm 3 core fixed to pole or in trenches or passing through pipe all as specified and directed.

Cable jointing kit for 11 KV (Earthed) grade cable for outdoor termination heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 95 sqmm including dismantling / taking down unserviceable one complete all as specified and directed.

Cable jointing kit for 11 KV (Earthed) grade cable for indoor termination heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 95 sqmm including dismantling / taking down unserviceable one complete all as specified and directed.

Cable jointing kit for 11 KV (Earthed) grade cable for straight through heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 95 sqmm including dismantling / taking down unserviceable one complete all as specified and directed.

GI tubing 100mm bore medium grade for cable protection under road crossing including dismantling / taking down unserviceable one complete all as specified and directed.

Un binding from insulators and re–stretching only existing ACSR of any size on HT poles including binding the ACSR with new insulators with aluminium binding wire 2 mm dia complete all as specified and as directed.

All as per srl item No. 14 here-in-before but re–stretching only existing GI earth wire 4 mm dia on HT poles & including binding with 1.63 mm dia GI binding wire all as specified and as directed . Note for item No. 14 to 15 :- (i) For measurement purpose only length of each wire shall be measured

Dismantiling and taking down old unserviceable ACSR conductor any size complete all as specified and directed.

ACSR conductor including jointing with existing conductor and stringing on pole and proper fastening to insulators with aluminium binding wires and required jumpering connection including dismantling/ taking down unserviceable one all as directed.

Cross arms including replacement of bracings, supports, clamps and back plates fabricated from structural steel sections including nuts, bolts, washers, welding, bending cold or hot, drilling holes for bolts, in any shape or size as indicated or directed and inclusive of one primer coat, one under coat and one finishing coat of paint including dismantling/ taking down unserviceable one all as specified.

Disc type insulator porcelain, vitreous 145mm high and 255 mm dia ball and socket type white, brown or green, double disc with tension clamp for conductor for working pressure voltage 11000 V including dismantling/ taking out unserviceable one from Pole complete all as specified.

Pin type, porcelain, vitreous, brown, including one galvanised mild steel spindle, two galvanised iron washer and one galvanised iron nut, 150mm dia and 150 mm height for 11000 volts grade including dismantling/ taking out unserviceable one from Pole complete all as specified.

Loop type insulator, porcelain vitreous white, brown or green of size 90x140mm and clearence hole 25.5mm including dismantling/ taking out unserviceable one complete all as specified.

Lightning arrestor, Gapless Metal Oxide type, distribution class, System voltage-11KV, min rating-10KV, Discharge cap-10 KA, Line discharge class-1 complete with bracket and connection complete all as specified and directed.

Switch Air brake, gang operated, triple pole, mechanically operated mounted on HT insulators (12 insulators pin type ) and MS galvanised steel frame with operating mechanism operated from ground level with fixed contacts of phosphorous bronze and moving contacts of copper including operating rod for current rating upto 200 Amps, 11000 volts complete with locking arrangement, including 3 Nos drop out explusion type of fuses with fuse barrels of required capacity to suit load at site, also including provision of two coats of aluminium paint over a coat of red oxide primer on MS work complete all as specified and as directed.

Expulsion type drop out fuse, single pole, 11000 V, 25 Amps complete with insulator 150mm dia and 150 mm height including dismantling /taking down old unserviceable one all as specified and directed.

Earthing complete with galvanised steel earth electrode plate of size 600x600x6mm thick, buried directly in ground (earth pit not less than 2.25m deep below normal ground level) with top edge of the plate not less than 1.50m below normal ground level, connected to galvanised iron earth strip 32x6mm upto test point with suitable GI nuts/bolts and brazed properly up to main board including earth pit in cement concrete 1:2:4 type B-1, precast RCC cover in 1:2:4 reinforced with expanded metal, with suitable handle, excavation and earth work in any type of soil and including light grade GI watering pipe 20mm bore with funnel wire mesh and medium grade GI wire protection pipe 40mm bore up to main board complete as shown in electrical plate No 3 of MES schedule Part-I 2009, connected to earthing testing point including taking out existing unserviceable earthing complete all as specified and testing on completion complete all as specified and directed. Note - The units rate includes the cost of excavation & earth work in any type of soil, charcoal & salt in alternate layers, 20mm GI pipe (light grade) for watering 40mm GI protection pipe (medium grade) funnel wire mesh PCC chamber in PCC 1:3:6 type C-1 cast iron frame and 40mm thick RCC cover for pit etc & no extra payment will be made.

Painting of HT steel tubular pole including cross arm/ bracing/clamps complete with one coat of aluminum paint including cross arm, bracings, supports, nuts, bolts, and including making alternative black and white strips on pole with synthetic enamel paint (each strip 30 cm height) up to 1.5 mtr height from top of PCC foundation block and writing pole Nos and including applying one coat of cement base paint on exposed surface of PCC coping and foundation block complete all as directed.

Trimming off branches of trees touching HT electric over head line by climbing up tree or using ladder at a height not less than 9.5 mtr from GL and making clear about 3 mtr in radius and carrying and depositing where directed not exceeding 50 mtr complete all as specified and directed.

Setting of 3 ph overcurrent + earth fault relays by secondary injection of current with suitable equipment for overcurrent & earth fault with high set and low set including necessary checking of trip circuit, relay circuit, closing circuit, alarm circuit, DC supply circuit, AC supply circuit and repair of same as required for 11 KV VCB after disconection of incoming and out going HT XLPE cable connection and reconnection of cable ends at existing terminals after completion of relay setting complete all as specified and directed.

Replacement of LED panel indicator complete with lamp Red/Yellow/green/amber complete all as specified and directed.

Replacement of LED panel indicator complete with lamp Blue/white complete all as specified and directed.

Replacement of spring charging motor, AC 230 volts complete all as specified and directed.

Replacement of battery 2 Volt 80 Ah maintenance free suitable for battery charger complete all as specified and directed.

Replacement of voltmeter analog type of size 96x96 mm complete all as specified and directed.

Filtration/dehydration of transformer oil of transformer voltage grade 11/0.433 KV,indoor/outdoor type, pole / plinth mounted installed at various electric sub station/ pump in situ till it achieves dielectric strength min 50 KV at 4mm gap all as specified and directed.

Topping up/ replacement of transformer oil with new transformer oil suitable for working voltage 11000 volts grade including necessary dehydration to achieve dielectric strength min 50 KV at 4mm gap complete all as specified and directed. Note for serial item No 37 & 38:- (a) New transformer oil to be bought in company sealed ISI marked container with test certificate (b) Filtration /dehydration of transformer oil shall be carried out at the location where transformer is installed and necessary filter/dehydration plant having pressure gauge, hour meter, temperature gauge to be brought at site by contractor including electric supply arrangement to run the dehydration equipment and rate deemed to be included in the quoted rate.

Replacement of silica gel grains in the breather assembly of transformer complete all as specified and directed.

Replacement of breather assembly made with polycarbonate base and clear acrylic glass of size min 50mm dia, min 120 mm long of suitable size as per site requirement for transformer complete all as specified and directed.

Replacement of transformer temperature gauge dial type having temp range 0 to minimum 120 degree celcius complete all as specified and directed.

Opening of top cover in situ or at wksp for transformer capacity upto 63 KVA to 250 KVA, 11/0.433 KV volts grade by unscrewing all nuts, bolts & washers, draining out transformer oil upto required level and keeping in clean container for replacement of HT/LT bushings, for lifting of core assembly, for cleaning/repair and refixing complete with new cork sheet gasket, existing/new nuts, bolts & washers for transformer indoor/outdoor type, refilling of oil all as specified and directed. (Note:- HT/LT bushings, Studs, Nuts, bolts & washers required new are mesured here-in-after as separate item.)

Replacement of transformer porcelain bushing outdoor/indoor type in situ/wksp suitable for 11 KV grade complete with brass stud, rubber bush, washers, nuts, checknuts and cork sheet gasket for the rating of 63 KVA to 250 KVA, 11/0.415 KV transformer complete all as specified and directed. Note: Opening of top cover measured separately

Replacement of transformer LT porcelain bushing indoor/outdoor type in situ/wksp suitable for 1100 volts grade complete with rubber bush, washers, nuts, checknuts and cork sheet gasket for the rating of 63-100 KVA, 11/0.433 KV transformer complete all as specified and directed. Note:(a) Opening of top cover measured separately. (b) Brass stud measured separately

All as per item No-44 here-in-before but for transformer capacity 100-200 KVA,

All as per item No-44 here-in-before but for transformer capacity 200-300 KVA,

All as per item No-44 here-in-before but for transformer capacity 300-500 KVA,

All as per item No-44 here-in-before but for transformer capacity 500-850 KVA,

Replacement of brass stud suitable for LT 1100 volts grade with cork & rubber washer, double Brass nuts & brass washer at both end of stud for Transformer capacity 63-100 KVA

All as per item No-49 here-in-before but for transformer capacity 100-200 KVA,

All as per item No-49 here-in-before but for transformer capacity 200-300 KVA,

All as per item No-49 here-in-before but for transformer capacity 300-500 KVA,

All as per item No-49 here-in-before but for transformer capacity 500-850 KVA,

Taking out manually defective transformer of capacity 250KVA from its position upto road n. exc 1 KM and transportation by vehicle to workshop n. exc 30 KM and reinstallation at original position after repair or Shifting of transformer from present location to original location all as specified and directed. (Note: a) Rate deemed to included for necessary HT/LT cable/ACSR, earthing connection after installation)

Lifting up carefully transformer core after dismantling carefully terminal connections from core to HT/LT bushings, tap changer assembly, drainout all oil and keeping in clean container, dismantling all HT & LT coils from core for rewinding, and reassembling complete with HT/LT coils to core, required necessary numax paper insulation, insulating press board, precompressed board size of 6mm/3mm/1.5mm/1mm, varnishing, heating to achieve insulation level not less than 1000 megaohms at both HT & LT side, core at transformer chamber, tap changer assembly, terminal connection, top cover with new cork sheet gasket, required existing/new nuts, bolts & washers, filling transformer oil, testing after repair complete all as specified and directed for the 250 KVA, 11/0.415 KV transformer. (Note:- Opening of top cover, Rewinding of HT/LT coils, transformer oil, nuts, bolts & washers, HT/LT bushings, required new are measured separately under appropriate item)

Rewinding of HT coils suitable for 11000 volts grade with new DPC/super enamelled copper wire having Class-F insulation as per existing size and turns for capacity of transformer 75-850 KVA complete all as specified and directed.

Rewinding of LT coils suitable for 1100 volts grade with new DPC /super enamelled copper strip having Class-F insulation as per existing size and turns for capacity of transformer 75-850 KVA complete all as specified and directed.

Supply only mild steel screw bolts (machine made) with hexagonal head at one end and screwed the other with washer and one hexagonal nut n. exc 5 cm long and 5 to 10 mm dia of neck complete all as specified and directed.

Overhauling of step down outdoor/indoor transformer 11/0.433 KV (400-750 kVA) by disconnecting HT/LT terminals, decanning transformer oil , removing sludge, cleaning of HT /LT bushings to remove dust particles /dirt etc. cleaning the core and winding with compressed air and re-assemble complete including replacement of copper windings, copper washers, rubber bushes of HT/LT bushings, replacement of cork sheet of 6 mm thick suitable for transformer top cover, terminal boxes refilling the transformer oil and topping up with new transformer oil and centrifuging to achieve the dielectric strength upto 50KV painting with two coat of synthetic enamel paint over a coat of red oxide primer after preparation of painted surfaces of transformer and testing and recommissioning on load etc complete for the transformers of above mentioned rating. (Dehydration of transformer oil by filtration, topping up transformer oil, shall be measured and paid separately as supply only under respective items).

All as per item No-59 above but capacity of transformer 100 KVA to 250 KVA.

Disconnecting electrical connections of transformer of capacity 400 to 750 KVA of any make & any type, loading the transformer on heavy vehicle (open chassis) type from existing platform/four pole structure, by heavy crane long boom type suitable for shifting and loading transformer and transporting of transformer for repair / rewinding at workshop at Dharampur from Subathu Stn Area including unloading of transformer from vehicle at workshop & Opening up transformer step down 11/0.433 KV by unscrewing all nuts/bolts and washers of top cover duly draining out complete transformer oil and kept aside for re-use. Disconnecting of all HT/LT wiring tap changer, complete LT/HT bushing, air breather etc and kept aside for re-use of the serviceable parts and removal of unserviceable parts and taking out complete core assembly of transformer with help of chain pulley to carry out the following works:-

(a) Deslurring of transformer tank by taking out the complete deposited transformer oil sludge and cleaning thoroughly the transformer tank by washing & wiping out all dirt/rust accumulated including preparation of old painted internal/external surfaces of transformer. Painting the internal surfaces of transformer with two coats of high grade anticorrosive varnishing paint over a coat of red oxide primer. Painting to external surfaces of transformer with two coats of Ist grade synthetic enamelled paint over a coat of red oxide primer, all as shown and directed.

(b) Cleaning the transformer core assembly using electric blower and making the core free from sludge, dirt and any other foreign materials from its surfaces including provision of high grade insulation varnish and raising insulation of the core through heat chamber and raising of IR valve /LV-E > 500 Mega ohms HV-E >1000 Mega ohms

(c) Assembling the transformer complete including supply of complete set including replacement of defective accessories such as oil seal , gasket , LT/HT bushing, stud, air breather, tap changer, including making necessary LT/HT wiring as dismantled( New spares as required will be measured & paid separately under relavent items, rate of oil seal & gasket will be deemed included in the quoted rate ). Powering of dehydration/filtered transformer oil (dehydration charges will be measured and paid separately) as obtained during dismantling and top up balance quantum with new transformer oil as required (New transformer oil will be measured & paid under relavent item) after successfully repairing the transformer reloading the same & placing to its original location and installation complete including making LT/HT side cable connection, earth connection and testing complete all as specified and directed.

All as per item No-61 above but capacity of transformer 100 KVA to 250 KVA.

Replacement of worn out copper strip/ wire /rod with new one as per existing gauge/ size all as specified and directed.

HV Bushing of transformer with Brass metal connecting rod, nut bolt and washer,suitable for 400 KVA to 750 KVA capacity of transformer 11000 Volt as per IS 3347/1967 complete all as specified and directed.

All as per item No-64 above but capacity of transformer 100 KVA to 250 KVA.

LV Bushing of transformer with Brass metal connecting rod, nut bolt and washer,suitable for 400 KVA to 750 KVA capacity of transformer 1100 Volt as per IS 3347/1967 complete all as specified and directed.

All as per item No-66 above but capacity of transformer 100 KVA to 250 KVA.

Cork sheet for top cover suitable for 400 to 750 KVA capacity transformers fixed in replacement complete all as specified and as directed.

All as per item No-68 above but capacity of transformer 100 KVA to 250 KVA complete all as specified and as directed.

Anti-climbing device, spikes type fabricated out of M.S bars ( round, square and flat ) including nuts, bolts, washers and welding in two halves made to shape to suit the cross section of the pole suitable for PCC/Steel poles including two coats of synthetic enamel paint over a coat of red oxide primer complete all as specified.

Supply & fixing Glavanised iron strip 32x6mm buried in ground.

Taking out existing earthings and M&L for chemical earthing (Pipe in pipen technology) Two B class IS mild steel pipe, one inside the other, hot dip galvanised with 100 micron coating outside and about 300 micron coating inside filled with high conductive and corrosion Resistant Crystalline Mixture inside and Backfill compound around the outer electrode) outer electrode dia 72 to 80mm and inner electrode dia 35 to 40 mm both 10' long, including making earth pit of size 4' x 4' and 11' deep fill the entire pit with black cotton soil or normal soil, pour enough water so that pit is full with water, leave it for three days so that soil soaks up the water, the soil level has goes down, again top up the pit with soil & fill the water. After two or three days when the pit is sturdy and ready for earthing purpose, install the earthing electrode as per installation method as below:- (a) Mix backfill compound evenly with soil. (b) Remove plastic sleeve carefully from electrode. (c) Place naked electrode at centre of pit. (d) Start refilling empty space around electrode with backfill compound in layers. (e) Pour some water and poke the pit with a long wooden rod to allow trapped air to escape. (f) Gradually continue refilling process till electrode is buried in the pit up to the green patch painted on the top portion of electrode. (g) Ensure that pit is not watery (h) Pack electrode with compound nicely and tightly, so that it stands firmly in pit. (j) Pour a few buckets of water around pit. (k) Pour a few buckets of water around in the pit everday for 10-15 days for system to set. (l) Connect the earth electrode with equipments by 25mm x 3mm aluminium strip. (m) Earthing test point terminal block made of gun metal size 150x100x50 mm drilled and screwed including 4 Nos 8 mm dia 40 mm long hexagonal head bolts and washers duly fixed on walls with fasteners 4 Nos. Note : (a) Earth resistance shall not be more than 5 Ohm. (b) Aluminium strip for connections shall be measured and paid separately.

Supply and fixing danger notice plate of 1.6mm thickmild 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, 25x20 cm size complete all as specified and directed.

R D Bansal