SPECIAL REPAIR TO 5 MVA (66/11 KVA) TRANSFORMER AND REPLACEMENT OF HT INFRASTRUCTURE AT AF STN HALWARA

Amount

M & L for HT outdoor type (heat shrinkable) cable end joint suitable for HT cable 11000 volts grade 120 Sqmm 3 core, jointing and testing complete all as specified and as directed.

M & L for HT outdoor type (heat shrinkable) cable end joint suitable for HT cable 11000 volts grade 240 Sqmm 3 core, jointing and testing complete all as specified and as directed.

M&L for heat shrinkable straight through joint suitable for 11000 volts XLPE cable aluminium conductor of size 3 core 240 sqmm, jointing and testing complete all as specified and as directed.

M & L for HT outdoor type (heat shrinkable) cable straight through joint suitable for HT cable 11000 volts grade 120 Sqmm 3 core, jointing and testing complete all as specified and as directed.

S&F in repairs HT feeder pillars box out door type made out of MS sheet (CRCA) of thickness not less than 3.15 mm, of size 150cm x 65cm x 90 cm with alluminium bus bar strip 3 Nos of size 200 cm in length, 4 cm in width and 6 mm in thickness suitable for 11000 volt grade mounted on HT porcelain insulator, front opening door having two leaf braced with hinged, mounted on 4 Nos angle iron 100 mm x 100 mm x 8 mm, 90 cm long duly welded with box and grouted in PCC 1:3:6 type C-1 (using 20 mm graded mechnically crushed stone aggregates) block of size 30 cm x 30 cm x 15 cm ,top of box shall be of MS sheet duly bent in slope, tapper with projection of 20 mm on all side, weather / vermin proof with high quality of rubber beeding on panel door, cable entry arrangements at bottom includes earthing terminals 2 Nos at both side duly painted with red stove enamelled paint 2 coat over a primer coat complete all as specified and as directed.

M & L in replacement earthing complete with GI earth plate electrode of size 60 cm x 60 cm x 6 mm thick buried directly in ground vertically at a depth not less than 2.25 mtr below normal ground level with top edge of earth plate at depth not less than 1.5 mtr below normal ground level surrounded from all sides by 15 cm thick and packed layer of charcol dust and common salt filling in alternate layers and electrode connected by galvanised iron strip 32 mm x 6 mm by means of bolts, nuts, check nuts and washers connected to test termination point protected by 40mm bore GI pipe light grade and GI pipe light grade 20mm bore for watering and including funnel, wire mesh, RCC pit cover and PCC chamber pit with PCC 1:2:4 type B1 including excavation and earth work, disposal of surplus soil to a distance not exceeding 50 mtr all as shown in electrical plate No 3 of SSR Part I complete all as specified and directed. Note-- (i) The unit rate shall include for GI water pipe, protection pipe wire mesh, funnel, excavation, RCC pit cover, PCC, test point, G I strip 32 X 6 mm from top of earth plate upto 5 mtr (ii) PCC pit shall be provided at least 1.5m away from the earth pit and extra cost of additional length of water pipes and fixing junction, elbows etc. shall be deemed to be included in the unit rate. (iii) RCC pit cover shall be pre-cast RCC 1:2:4, type B-1, 80 mm thick reinforced with XPM weighing not less than 4kg/Sqm in lieu of cast iron cover.

Opening of all HV and LV bushings on Top of existing transformer 5 MVA (66/11 KV) Make : Volt Amp Vadodara and remove old transformer oil of density less than Dielectric strength 66 KV at 2.5 mm Gap test report to be attached transformer oil ( measurable from site ) from the tank, after removing of transformer oil from the tank remove the top cover of transformer and lifting of HV windings including core and platform and LV winding from the tank at OEM site Vadodara and kept in safe custody for inspection of all HV & LV Coils windings/Core in front of Rep of Accepting Officer after completion of joint inspection, repair of transformer by OEM ie Volt Amp, Vadodra ( OEM report mentioning and confirming following parameters are mandatory after all complete necessary repairs and updating 66KV/11 KV EHT TFR Rating 5 MVA, (ONAN) No load Voltage ratio (KV) 66/11 KV (66 KV–HV Star & 11 KV –LV Star) Connections - HV/LV -- Star / Star ,Vector Group : YNyn0 Tapping’s on HV for HV +5% to -15% , Variation by an “OLTC+RTCC --in steps of 1.25% each, +AVR “Tapping Switch, Permissible temperature rises, Top Oil -50° C, Average Winding 55° C, Location Outdoor , Cooling ONAN, H.V.Termination --Bare Bushing, , L.V.Termination Bare Bushing , No Load Loss -7 KW (IS TOL) Full Load Loss -45 KW (IS TOL), Flux Density Not to exceed 1.9 Tesla at 110% of rated voltage. The OEM has to ensure following fittings all in working, 01 No Rating & Diagram Plate – Anodized Aluminum 02 Nos- Earthing Terminals. 04 Nos. Lifting Lugs.01 No Oil Level Indicator with minimum level marking. 02 Nos Thermometer Pockets. 01 No. - Conservator with oil filling hole with cap and drain plug. 01 No, Air Release Plug. 01 No. - Silica gel breather. 04 Nos. Bi-directional Rollers., Jacking Pads, Radiators, 01 No, Explosion Vent with Diaphragm., 01 No Bottom drain-cum Filter Valve. 01 No Top Filter Valve., OLTC (On Load Tap Changer)Accessories 01 NoBuchholz Relay with alarm & trip contact, 01 No. Oil Temperature Indicator with A/T contact, 01 No.Winding Temperature Indicator with A/T contact., 01 No. Marshalling Box. 01 No. Magnetic Oil Level Gauge (with Low Oil Level Alarm Contact). OEM has to undertake following parameters in rewinding of existing EHT TfrExciting current referred to HV at 50cps (Guaranteed)i) 90% rated voltage i) 90% rated voltage ii) 100% rated voltage 1% of FLRC iii) 110% rated voltage 1.5% of FLRC Power factor of exciting current at 100% rated voltage and 50 Cps. Approx. 0.02 B. Core 05 MVA PARTICULARS TRANSFORMER Form of core Cruciform Core Type Induction density in the core, at rated voltage and 50 cps 1.7 Tesla Induction density at 110% voltage and 50 cps. 1.9 Tesla Thickness of iron stamping 0.27 mm approx. Exciting KW per 1b of iron at i) 15000 Gauss iii) Induction as per item Quality of sheets (Hot or cold rolled) Cold Rolled Grain Oriented (CRGO) Induction between core lamination CARLITE (Insulation) Type of joint between core limb & Yoke Mitred Butt Joint / Step Lap Bolt insulation test voltage (One volt minute) 2 KV C. Windings 05 MVA PARTICULARS TRANSFORMER Type of winding HV- Disc / LV- Helix/Spiral/Disc Current density in Amps./ Sq. in i) HV winding Not more than 4.0 A/mm² ii) LV winding Not more than 4.0 A/mm² Insulation on the copper Oil impregnated kraft paper Type of joints in the winding Brazing / Crimping Insulation strength of winding with 1.5 x 40 micro second wave or 1 x 50 micro second wave i) Impulse full wave (withstand values) ii) HV 325 KVp iii) LV 75 KVp vii) Applied voltage test viii) HV 140 KVrms ix) LV 28 KVrms HV N- 95Kvp-38KVrms a) Induced voltage test KV Minimum clearance to earth i) LV and core Adequate as per manufacturing standard ii) HV and Yoke Estimated switching withstand voltage surge Switching Impulse -Not Applicable.The following installation / Erection will be done qualified electrical license holder Engineers:Radiator fitting, Conservator fitting, Oil filling in conservator & Radiators.Control connections (A/T)Marshalling Box connectionsHV & LV connections cable. Before final charging of repaired 66 KV/11 KV EHT Tfr the contractor has to submit electrical test report conducted by PSPCL with following tests) WINDING RESISTANCE, SHORT CIRCUIT TEST, OPEN CIRCUIT TEST, INDUCED OVER VOLTAGE TEST, SEPARATE SOURCE VOLTAGE TEST, INSULATION RESISTANCE TEST, TURNS RATIO TEST, VECTOR GROUP CHECK TEST, BDV VALUE OF OIL.Complete Calibration of 66 KV Transformer control and relay panel complete such as ANN-annunciator, Master trip relay, Aux external trip relay, Trip CKT supervision relay, DC fail supervision relay, existing differential relay, SPAJ overcurrent & earth fault relay, auxiliary relays etc and settings as per site conditions and manufacturer's instructions by applying AC/DC to voltage coil unit and measuring the time taken by relay to have trip command on each OC & EF etc including replacement of old /burnt wiring complete all as specified and directed. (a) Repairs/Replacement of Direct/indirect material like Brazing rods, creep paper roll, Copper lugs, gaskets, oil seals, paint etc. during the rectification of work HSN Code 8504. (b) Replacement of burnt LV windings (03 Nos) with new copper conductor (Including necessary Paper covering & Insulation HSN Code 8504. (c) Replacement of Assembly insulation for all 3 phases HV and LV windings. (d) Filling of Transformer oil as per OEM recommended qty i.e5480 Ltrs (for Top up) and testing of transformer after repairs in front of Rep of Accepting Officer and test result shoud be submitted to Accepting officer for keeping in record. After repairing and testing of transformer Transportation of Transformer including transit insurance Charges from Vadodara to Halwara. (e) Labor Charges for repair & maintenance i.e. Rectification / Repairs of 01 No. 5 MVA, 66/11 KV, Voltamp Make JN – 22879 ONAN transformer at OEM VOLTAMP Salvi works. (f) Labor Charges for repair & maint i.e deputation of Engr for (1-2 days) for supervision of Testing and commissioning of Transformer 5 MVA 66/11 KV. (g) Maint and repair services i.e Labour charges for dismantling of transformer & accessories at site, Dragging and loading of Transformer & accessories at site as well as unloading dragging of Transformer & accessories at site, placing on plinth and erecting transformer complete all as specified and directed by Engr-in-Charge.

M&L for Heavy Mobile Telescope crane unloading of Transformer from truck and fixing on Transformer plinth including necessary insurance as per site complete all as specified and as directed.

M/s Shiksha Enterprises