Certain repairs to 33 KV Transformers, connected works and repairs/replacement of 33 KV HT Switch Gear/VCB under GE (N) Bikaner at Mil Stn Bikaner

Amount

Servicing and testing of Power Transformer 5 MVA 33/11 KV installed at KLP Power House by disconnecting HV & LV side, WTI, OTI, buchholz wiring and earthing complete and carrying out following tests in the presence of Engineer-in-Charge and produce test certificate complete all as specified & as directed :- (a) Earth Resistance Test. (b) BDV Test. (c) IR value of windings HV & LV side both on short circuit and open circuit position. (d) Polarisation Index value of Transformer. (e) IR value of bush insulators LV & HV side. (f) Tuning of WTI, OTI and buchholz with VCB panel and carrying out tripping.

Supply and fixing in replacement HV bush assembly of 33/11 KV 3.15/5 MVA Power Transformer complete with insulator bushing rod, check nuts, washers, packing complete all as specified and as directed.

Supply and fixing in replacement LV bush assembly of 33/11 KV 3.15/5 MVA Power Transformer complete with insulator bushing rod, check nuts, washers, packing complete all as specified and as directed.

Supply and fixing in replacement Gasket set made of rubberised cork/neoprene material for power transformer 33/11 KV of capacity 3.15/5 MVA complete all as specified and as directed.

Supply and fixing in replacement WTI (Winding Temperature Indicator) for power transformer 33/11 KV of capacity 3.15/5 MVA including necessary wiring from WTI, Marshalling box to 33 KV VCB complete all as specified and as directed.

Supply and fixing in replacement OTI (Oil Temperature Indicator) for power transformer 33/11 KV of capacity 3.15/5 MVA including necessary wiring from OTI, Marshalling box to 33 KV VCB complete all as specified and as directed.

Supply and fixing in replacement Buchholz relay for power transformer 33/11 KV of capacity 3.15/5 MVA including necessary wiring from Marshalling box to 33 KV VCB complete all as specified and as directed.

Supply and filling new mineral grade transformer oil EHV type conforming to IS-335 of 1993 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.

Dehydration & filtration of transformer oil with portable filtration cum dehydration machine to improve the dielectric strength, not less than 50 to 60 KV within 1 minute with 4 mm Gap at site of any installation in Cantt area of any capacity/make of transformer installed on pole mounted, indoor/outdoor type plinth mounted complete all as specified and as directed. Notes: (i) All necessary T&P / testing equipment shall be provided by the contractor at his own cost. No extra payment shall be made to the contractor. (ii) Contractor shall ensure that there shall be no wastage of transformer oil. (iii) Contractor shall ensure that conservator tank is full to its level before starting the dehydration. (iv) New Transformer Oil required for topping up shall be measured and paid for separately under relevant item of this Schedule. (v) Testing of dielectric strength of dehydrated transformer oil of each transformer shall be carried out in the presence of Engineer-in-Charge and cost thereof shall be borne by the contractor.

Surface dressing not exc 15cm deep in soft/loose soil and clearing away all grass vegetation, saplings, shrubs, brushwood, undergrowth, roots, and trees not exceeding 30 cm girth (measured one metre above ground level) surrounding Transformers, LT Panels, 02 Pole structures, 04 Pole Structures, etc at various sub stations / E&M installations and removing rubbish upto a distance exc 200m & not exc 250m outside the periphery of the area under clearance complete all as specified & as directed.

Taking out silica gel from unserviceable breather assembly of transformer of any capacity and supply & filling new Silica Gel blue in crystal complete all as specified and as directed.

Disconnecting HT 33 KV outdoor VCB unit and indoor control panel capacity upto 1600 Amp, over hauling of complete unit, opening the total mechanical and electrical mechanism of breaker, checking its contact, baffle plates and other minor parts, cleaning all complete accessories carefully. Minor repairs shall be rectified, parts/accessories shall be cleaned, the tank, baffle plates, rotating contact, upper supports, lower supports, drive assemblies and all other spare parts, reassembled after repair/ replacement of the spare parts including calibration, testing of existing IDTM relay as per load parameter complete all as specified and directed. Notes :- (i) Repair work shall be carried out only by the authorised technician of manufacturer of VCB. (ii) Spare parts as required for replacement of existing worn out parts shall be measured and paid separately under appropriate items. (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 all spare part shall be used as per existing make of manufacturer.

Supply only Spring Charging motor assembly 110/230 Volt AC/DC for 33 KV outdoor VCB complete all as specified & as directed.

Supply only Closing coil Assembly for 33 KV VCB complete all as specified & as directed.

Supply only Tripping coil Assembly for 33 KV VCB complete all as specified & as directed.

Supply only Motor Cut Off Limit Switch for 33 KV VCB complete all as specified & as directed.

Supply only Auxiliary Switch (7 NO + 7 NC) for 33 KV VCB complete all as specified & as directed.

Supply only TNC Switch for 33 KV VCB complete all as specified & as directed.

Supply only Power pack with battery backup 230/110 Volt AC input and 24 Volt DC output for VCB complete all as specified & as directed.

Supplying, installing, testing, calibrating and commissioning of the electronic relays with instant tripping system, working voltage 24 V/110 V, EF 10% to 40% in 50% to 200% in advance including taking out the existing unserviceable relay (CG114N/CG114S) complete all as specified and as directed.

Supplying, installing, testing, calibrating and commissioning of the master trip relays, working voltage 24 V / 110 V complete including taking out the existing unserviceable relay all as specified and as directed.

Supply only Vacuum Interrupter bottle 4 inch dia (Make-Stelmac/CG/Siemens) for 33 KV outdoor VCB complete all as specified & as directed.

S&F in replacement PVC insulated copper conductor cable of size 2.5 Sqmm 12 Core, 1100 Volts grade (ISI marked), FRLS, complete all as specified and as directed.

S&F in replacement PVC insulated copper conductor cable of size 2.5 Sqmm 4 Core, 1100 Volts grade (ISI marked), FRLS, complete all as specified and as directed.

S&F in replacement PVC insulated copper conductor cable of size 1.5 Sqmm Single Core, 1100 Volts grade (ISI marked), FRLS, complete all as specified and as directed.

M&L for Chemical Earthing to 33 KV Sub Station / Transformer / equipments etc with & including Copper earth plate electrode of size 90 cm x 60 cm x 5 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 back fill chemical compound to increase the conductivity of soil, connected to & including copper earth 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 Sub Station / Transformer / equipment body / test point with two Nos nuts bolts or welding with structure, Copper 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.

Notes for serial item No. 26 above :- (a) Properties of Back fill chemical compound shall be as under :- (i) Its PH value shall be more than 7 and less than 9. Test certificate for the same from NABL approved laboratory shall be submitted by the contractor to Engineer-in-Charge before execution of this item at site. (ii) It shall have low resistivity preferably below 0.2 ohm-meter. (iii) It shall not depend on the continuous presence of water to maintain its conductivity. (iv) It shall have capacity to retain more than 10% moisture at 105 degree centigrade. Test certificate for the same from NABL approved laboratory shall be submitted by the contractor to Engineer-in-Charge before execution of this item at site. (v) It shall not decompose or leach out with time. (b) 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. (c) Contractor shall provide test certificate after testing of earthing and value of earth resistance shall not be more than 1 ohm.

M&L for earth continuity conductor or main earthing lead fixed to wall on batten or recess or chases or buried in ground or drawn in conduit/pipe or fixed to poles or any other indicated situation for loop earthing etc. as required, copper strip 32x6mm, fixed in repairs, complete all as specified and as directed.

M&L for cleaning and preparation of old painted steel & iron surfaces (exposed external surfaces only) of transformer 5 MVA 33/11 KV capacity installed at site by scrapping with steel wire brush, emery paper, using coarse cloth/sore brush etc and painting with two coats of synthetic enamel smoke grey paint over a coat of red oxide zinc chrome primer with the help of spray gun & machine, including writing of SM No., MES No etc. on transformer with thick black synthetic enamel paint in white back ground, complete all as specified and as directed.

M&L for cleaning and preparation of old painted steel & iron surfaces (exposed surfaces only) of lattice tower structure complete at KLP Power House (33/11 KV Sub Station) by scrapping with steel wire brush, emery paper, using coarse cloth/sore brush etc and painting with two coats of Aluminium paint over a coat of red oxide zinc chrome primer complete all as specified and as directed.

M&L for cleaning and preparation of old painted steel & iron surfaces (exposed surfaces only) of lattice tower structure complete at Udasar Power House (33/11 KV Sub Station) by scrapping with steel wire brush, emery paper, using coarse cloth/sore brush etc and painting with two coats of Aluminium paint over a coat of red oxide zinc chrome primer complete all as specified and as directed.

M/s Rohit Construction Co.