GENERAL KLC1 SITC of 1600KVA Transformer-Supply Installation Testing and Commissioning of 1600KVA Transformer at Kerala Legislative Assembly General Electrical Work

OD53918/2025-2026:Supply Installation Testing and Commissioning of 1600KVA capacity (continuous loading) BEE 3 Star rated , 11/0.433 KV step down, 3 Phase, 50 Hz, Dyn 11 vector group, ONAN (Oil Natural Air Natural) copper wound transformer (Electrolytic grade 99.9% pure copper, Core made of first grade Cold Rolled Grain Oriented (CRGO) Core grade MOH or better, suitable for Indoor applications with On Load Tap Changer (OLTC) on HV side in range of +5% to -10% in steps of 2.5%, having cable end boxes on HV side suitable for 3x300 sqmm XLPE cable of 11 KV grade, including bus trunking arrangement on LV side complete with all accessories and safety provisions as per relevant IS Code including filling of filtered dehydrated oil and transformer shall be confirming to IS : 2026, IS : 1180. Insulation level (Impulse withstand)(KVpeak): HV-75. Insulation level (power frequency withstand)(KVrms) : HV- 28, LV- 3 The maximum flux density in any part of the core and yoke at rated voltage and frequency shall be such that the flux density with +12.5 percent combined voltage and frequency variation from rated voltage and frequency does not exceed 1.9 Tesla. The permissible temperature-rise shall not exceed 40 °C for oil and 45 °C for winding with ambient temperature of 50 °C. Hot spot temperature rise over a maximum yearly weighted temperature of 32°C is 98°C. Short circuit Thermal withstand time is 2 sec. % Impedance at 75°C, rated current and frequency: 6.25%. Outside of tank shall be painted with suitable thermo setting epoxy primer followed by two coats of polyurethane base paint shall be used. IS: 1180 (Part 3) shall be referred to for paint thickness for normal to medium corrosive atmosphere. HV Bushings: a. Reference standard: IS 2099 & IS 3347 b. Type of bushing: Porcelain c. Voltage rating: 17.5KV d. Current rating: 250A 19. LV &LVN Bushings: a. Type of bushing: Epoxy b. Voltage rating: 1KV c. Current rating: 3150A. Design ambient condition: a) air temperature 50 °C, b) Relative Humidity 90 % Max, c) Seismic Zone as per location of site, d) Altitude as per location/site. Noise level shall not exceed limits as per NEMA TR-1 with all accessories running measured as per IEC 551 / NEMA standard. The transformer should have QR code which should contain drawing, test report OEM manual etc. Marking Each transformer shall be provided with rating plate made of anodized aluminium/ stainless steel material securely fixed on the outer body, easily accessible, as per IS: 1180 Part-3. The entries on the rating plate shall be indelibly marked. Fitting and Accessories : The following fittings shall be provided:- a) Two earthing terminals with the earthing symbol b) Oil level gauge indicating oil level at minimum, 30°C and maximum operating temperature; c) Silica gel breather d) Drain-cumsampling valve (¾″ nominal size thread, IS 554) preferably steel with plug for three phase transformers; e) Thermometer pocket with cap; f) Oil filling holes having (1¼″ nominal size thread) with cover (for sealed type transformers without conservator); g) Lifting lugs for the complete transformer as well as for core and winding assembly; h) Pressure relief device or explosion vent; i) One filter valve on the upper side of the tank; j) Unidirectional flat rollers; k) Inspection hole; l) HV side neutral grounding strip (where one of the HV bushing terminal is connected to earth); m) Buchholz relay. n) Oil temperature indicator and winding temperature indicators for with suitable tripping mechanism above permissible limit; o) Additional Neutral separately brought out on bushing for earthing; p) Non return valve (for conducting pressure test); q) Pressure relief device or explosion vent r). Monogram Plate; s) Inspection cover t). Detachable type radiators with top and bottom shut off valve. a) Oil Conservator with Oil level indicator, minimum level marking and drain plug. b) Necessary hardware, clamps, lugs etc. for termination on HV/MV etc. for all transformers. All tests shall be conducted as per IS 1180 Part (3):2021. The Transformer shall be installed at site as per the direction of Engineer in charge. Authorised Service engineer of OEM should be present at the time of installation and commissioning.

OD66911/2025-2026:Dismantling the existing 1600KVA transformer and its accessories and existing bus duct from the foundation without further damage, shifting the same using crane, skilled labours and supporting tools etc. from the worksite and conveyance to convenient place without any further damages as per the directions of Engineer in charge.

OD69183/2025-2026:Supply and laying of 3 core 300 sqm stranded compact circular aluminium conductor, conductors screened with extruded semi conducting compound XLPE insulated, insulation screened with extruded semi conducting compound in combination with copper tape (0.3KA for I sec.) cores laid up. inner sheath of PVC tape, galvanized steel flat strip armoured, and overall PVC sheathed cable conforming to IS: 7098 part II 1985 with latest amendments in the existing masonry open duct and giving connection etc. as required.

OD21660/2026-2027:Supply, laying and clamping of 1no: PVC insulated and PVC sheathed armoured aluminium power cable,11KV grade of the following sizes using clamps noted along with the cables, spacing of clamps not exceeding 60 cms, making good the damages ,colour washing etc. as required 3 core 300 sqm stranded compact circular aluminium conductor, conductors screened with extruded semi conducting compound XLPE insulated , insulation screened with extruded semi conducting compound in combination with copper tape(0.3 KA for 1 sec.) cores laid up. inner sheath of PVC tape, galvanized steel flat strip armoured, and overall PVC sheathed cable conforming to IS:7098 part II 1985 with latest amendments

10.5.4:Supplying and making outdoor cable end termination with heat shrinkable jointing kit complete with all accessories including lugs suitable for following size of 3 core, XLPE aluminium conductor cable of 11 KV grade as required :300 sq. mm

OD18804/2026-2027:Supply and drawing of 2.5 sqmm 12 core PVC/ XLPE insulated armoured control cables with copper conductors for working voltages up to and including 1100 V conforming to IS 1554 part I 1988 for PVC and IS 7098 Part I for XLPE with the cables, one number PVC insulated and PVC sheathed / XLPE power cable of 1.1 KV grade of following size in the existing masonry open duct and giving connection etc. as required.

OD18805/2026-2027:Supply, laying and clamping of 2.5 sqmm 12 core PVC / XLPE insulated armoured control cables with copper conductors for working voltages up to and including 1100 V conforming to IS 1554 part I 1988 for PVC and IS 7098 Part I for XLPE, spacing of clamps not exceeding 60cms, making good the damages , colour washing etc. as required

OD139120/2026-2027:Supply, laying and clamping of 1 no. PVC insulated and PVC sheathed armoured copper power cable, 1.1 KV grade of the following sizes using clamps noted along with the cables, spacing of clamps not exceeding 60cms, making good the damages , colour washing etc. as required. 4 core 2.5 sq mm with factory made clamp

OD18258/2026-2027:Supply and providing plate earthing with 1200x1200x12mm GI earth plate, 50 mm GI(medium class) watering pipe, GI funnel with weld mesh, 25x5 mm GI clamps, GI/MS cover plate with locking arrangements, charcoal/coke and salt etc. including providing brick work masonry enclosure at the top (450x450x450mm inside) etc. as required.