Repair Maintenance of Power Transformer VCB and connected items at MFFR under GE N Bikaner

Amount

M&L for disconnecting HV/LV connection of 33/11 KV power transformer of capacity 3.15 MVA, taking down from site of installation, inspection/assessing of the defective/burnt parts, core assembly of transformer in the presence of Engineer-in-Charge and then lifting, loading and transportation of unserviceable transformer to the workshop for repair/rewinding and repair to the transformer by dismantling the top cover and draining out entire unserviceable transformer oil and removing all unserviceable parts such as HV/LV bush assembly, nuts, bolts, washers, etc and removing all burnt LV/HV leg coils from the core, rewinding the LV and HV leg coils with same size of super enameled copper wire / copper strip high quality matching with existing impedances and providing class ‘E’ insulation with suitable insulating materials, nuts, bolts, washers, etc, heating the new transformer winding in special heat chamber for demoisturising of LV/HV coils, connecting the LV/HV coils, filling the fresh transformer oil including repair, cleaning and making good surface including internal cleaning, removing sludge, washing and painting with one coat of zinc chromate paint to inner side of the transformer body and one coat of synthetic enameled paint on the outer side of transformer body by spray painting machine after cleaning and removing oil spots from the body and re-assembling the transformer, testing at workshop, transporting/shifting back the transformer at site after repairs, installation, re-commissioning & testing at site complete all as specified & as directed. Notes : (i) The items considered for repair and maintenance of transformers are at Mahajan Field Firing Range (MFFR) located at an approximate distance of 160 KM from Bikaner city. (ii) All T&P/Vehicles for transportation and minor parts such as nuts, bolts, washers, insulating material, copper wire for delta connection, etc. shall be arranged by the contractor and the cost thereof shall be deemed to be included in the unit rate quoted against this item. (iii) Labour component required for the replacement of unserviceable major parts shall also be deemed to be included in the unit rate quoted against this item and unserviceable major parts such as copper wire / copper strip for rewinding, HV/LV bush assembly, transformer oil & silica gel shall be measured & paid for separately as ‘Supply only’ under respective items of this Schedule. (iv) Unserviceable transformer coil retrieved against this item shall be cut, completely damaged and converted into scrap in front of Engineer-in-Charge. (v) The transformer shall only be got repaired from one of the authorized firms/agencies of the manufacturer as approved by GE.

Supply only the following spares/items for repair/replacement to transformers under serial item No. 1.00 here-in-before :- Note : (i) Unless otherwise specified, make and model of part to be replaced shall be same as used/recommended by OEM.

HV bush assembly of 33/11KV 3.15 MVA power transformer complete with insulator, bushing rod, check nut, washer packing, etc complete all as specified and as directed.

LV bush assembly of 33/11KV 3.15 MVA power transformer complete with insulator, bushing rod, check nut, washer packing, etc complete all as specified and as directed.

Gasket set made of rubberised cork/neoprene material for power transformer 33/11KV of capacity 3.15 MVA complete all as specified and as directed.

High quality super enameled Copper winding wire / Copper strip of required size matching with existing impedances for rewinding the HV and LV leg coils of 33/11KV 3.15 MVA power transformer complete all as specified and as directed.

Breather assembly filled with fresh silica gel suitable for 33/11KV 3.15 MVA power transformer complete all as specified and as directed.

Mineral grade transformer oil EHV type conforming to IS-335 of 1993 for filling and for topping up in transformer duly filtered with filtration plant to obtain high dielectric strength not less than 40 KV (gap 2.5mm) complete all as specified and as directed. Note : Transformer oil shall be supplied in sealed barrels with test certificate. Cost of barrel shall be deemed to be included in the unit rate quoted by the contractor and empty barrel will be the property of the Department and same shall be deposited to the AGE E/M Store Yard. Nothing extra shall be paid on this account.

Temperature Gauge (ISI Marked) suitable for 33/11KV 3.15 MVA power transformer complete all as specified and as directed.

S&F Aluminium Conductor Steel Reinforced (ACSR) of size ‘Dog’ with 6 aluminium strands of 4.72mm dia & 7 steel strands of 1.57mm dia and/or any other size as directed, stringing for overhead line on HT poles including jointing with and including aluminium binding wire 2 mm dia, jumpers, line tapes, conducting jelly, etc and stretching properly including dismantling existing unserviceable ACSR conductor from overhead lines on HT poles complete all as specified and as directed. Notes :- (i) The ACSR conductors shall conforming to IS-398 (Part-II) and as specified in SSR Part-I. (ii) The unit rate quoted shall also deemed to include for supply and fixing of binding wire, aluminium tapes, etc which shall not be included in the weight of conductors for payment. (iii) Weight of conductors shall be determined by measuring the horizontal distance between centers of two adjacent poles and compounding the weight of conductors of that size and length and 3% extra shall be added for sag, jointing, jumpers etc. (iv) Weight of the conductors shall be calculated from the nominal weights given in tables in the relevant IS code.

S&F Switch air break, gang operated outdoor, Horizontal operated type, HT 33 KV, Triple pole, 400 Amps, 3 insulator per phase, rotating horizontal type, with fixed contacts of phosphorous bronze and moving contacts of copper, manually operated from ground level with operating mechanism including GI tubing medium grade 25mm bore operating rod, pad locking arrangements, MS bracing horns, flexible braiding earthing blades, rod and contacts without drop out fuse assembly and jumpers with dog conductor line, taps, clamps, colour coated HT sleeves and fittings suitable for horizontal mounting, fixed in repairs, complete all as specified and as directed.

S&F cross arms, bracing, supports, clamps and back plates fabricated from structural steel sections conforming to Grade E-165 (Fe 290) including nuts, bolts, washers, welding, bending cold or hot, drilled holes for bolts, in any shape or size with & including two coats of aluminium paint over a coat of aluminium red oxide primer, including dismantling & taking down old unserviceable rusted/damaged cross arms, bracing, supports, clamps, back plates, etc from existing poles / dismantled poles / pole structures complete all as specified & as directed. Notes :- (i) Size, section and shape of steel sections shall be as directed. (ii) Weight of paint shall not be considered for payment purpose and quoted rate shall deemed to be included this aspect.

Disconnecting the HT 11KV VCB panel capacity ranging from 400 to 630 Amp, overhauling of complete panel by taking out of the breaker, opening the total mechanism of breaker, checking its contact, baffle plates and other minor parts, cleaning the complete accessories carefully, rectifying minor repairs, cleaning the parts/accessories, tank, baffle plates, rotating contact, upper supports, lower supports, drive assemblies and all other spare parts and reassembling after repair/replacement of unserviceable parts and making connections with copper conductor cable of suitable size, complete all as specified & as directed. Notes :- (i) Repair/overhauling work shall be carried out only by the authorised technician of the Original Equipment manufacturer (OEM). (ii) Spare parts as required for replacement of existing worn out parts shall be measured and paid for separately as ‘Supply only’ under respective items of this Schedule. (iii) Labour for replacement/fixing of the supply only items shall be deemed to be included in the unit rate quoted against this item. (iv) Make of spare parts / items / accessories shall be as used/recommended by the OEM.

Supply only the following spare parts/items/accessories for repair/replacement to VCB Panel under serial item No. 6.00 here-in-before :- Note :- Unless otherwise specified, make and model of part to be replaced shall be same as used/recommended by OEM.

Trip catch assembly.

Big gear assembly.

Small gear assembly.

Tripping coil 30 V DC.

Closing coil 30 V DC.

Trip shaft.

Closing shaft.

Holding latch assembly.

Power pack 110 V input and 24 V DC output.

Spring charging motor 220 V AC/DC supply.

Roller bearing.

Isolating contacts suitable for 11 KV VCB, 630 Amps rating same to match with existing complete all as directed.

Indicator lamp in different colour code LED/Neon type complete (RYB) suitable for HT VCB 630/400 Amp.

Supplying, installing, testing, calibrating and commissioning of the IDMT relays with instant tripping system, working voltage 11 V, EF 10% to 40% in 50% to 200% in advance including taking out the existing unserviceable IDMT relay (CG114N/CG114S) complete all as specified and as directed.

S&F HT vaccum interrupted assembly with flex connection suitable for VMX type VCB 630 Amps capacity for RYB phases, fixed in repairs, complete all as specified and as directed.

S&F in replacement potential transformer 11KV/110 V burden with drawable type and including PT grid with risers suitable for HT 11 KV panel including testing and commissioning, complete all as specified and as directed.

S&F in replacement current transformer 11KV epoxy cast wound, CT of ratio 100/50/5A Class-I including necessary connection etc. including testing and commissioning complete all as specified and as directed.

S&F Danger notice plate of 25x20cm size, 1.6mm thick mild steel sheet, vitreous enameled white, with letters, figures and conventional skull and bones in signal red colour for HT 11000 Volts and fixed with suitable MS clamps made out of flat iron 25x3mm, bolts and nuts of approved size, fixed in repairs, complete all as specified & as directed.

M&L for painting to PCC HT Pole 11 metre long of any size with two coats of synthetic enamel paint in alternate black and yellow/white strips 30 cm each upto 1.50 metre height from top of PCC coping/pedestal marking pole numbers in letters & figures of size not less than 10cm height including preparation of old surfaces for painting complete all as specified & as directed.

S&F Anti-climbing device, spikes type fabricated out of MS bars (round, square and flat) conforming to Grade E-165 (Fe 290) including nuts, bolts, washers and welding in two halves made to shape to suit the cross section of the pole, fixed in repairs, complete all as specified & as directed.

S&F Lightning arrestor HT 11KV 65 kilo Amp Non linear expulsion type transmission class with standard fittings confirming to IS-3070 (Part-I) 1985, fixed in repairs, complete all as specified & as directed.

Cutting/trimming of tree branches around the HT 33/11 KV overhead line 3 metre clearance alround from the external conductors and removing the same from site and depositing at places within the cantt area complete all as directed. Note : The payment for this item shall be made by measuring the horizontal distance/length of overhead line irrespective of number of conductors in OH line.

M&L for Earthing to Transformer / GOD switch / equipments / panels etc with & including galvanised mild steel earth plate electrode of size 60 cm x 60 cm x 6 mm thick buried vertically in ground (earth pit not less than 2.25 m below normal ground level) with top edge of the earth plate at a depth not less than 1.5 m below ground level, the earth electrode surrounded by adequate quantity of charcoal dust and salt to a packed thickness of 15 cm on all sides, connected to & including galvanized mild steel strip 32x6 mm as earth lead, including nuts, bolts, check nuts & washers of galvanized iron or steel and riveted/welded to earth plate at one end and other end of strip connected to transformer / GOD / Panel / equipment body / test point with two Nos nuts bolts or welding with steel structure, GI earth strip encased in and including 40mm bore GI light grade pipe with all fittings from upper edges of earth plate upto 7.5 metre above ground level fixed with and including 25x3mm flat iron clamps, bolts, nuts and washer and also including providing watering pipe 20mm bore GI pipe medium grade from earth pit to top of electrode and including funnel, wire mesh, copper lugs etc complete with earth pit in PCC 1:3:6 type C1 using 20mm graded crushed stone aggregate and 40mm thick RCC (1:2:4 type B1) cover complete all as specified and shown in electrical plate No 3 of SSR Part-I including necessary excavation and earthwork in any type of soil, returning, filling in approved soil and disposal of surplus soil to a distance not exc 50m complete all as specified and as directed including dismantling & taking out old existing unserviceable earthing. Note : PCC chamber shall be constructed at least 1.5 mtr away from the earth electrode and pipe for watering shall be provided in slanting manner.

ALPHA ENGINEERING COMPANY

Pioneer Enterprises