Railway Works & Supplies Tenders

Supply, installation, testing and commissioning of floor mounted 800 kVA, 11/0.433 kV, three-phase, 50 Hz Dry Type Cast Resin Transformer, copper wound, naturally air-cooled (AN), conforming to IS 11171 / IEC 60076-11, suitable for indoor installation in railway traction/utility power distribution system. The transformer shall be of Star-Star connection (YNyn0) vector group with electrostatic shield (if applicable) between HV & LV windings for suppression of harmonics and transient over-voltages. The transformer shall have Class H insulation system (180°C thermal class), vacuum cast epoxy resin encapsulated windings with high dielectric strength, flame retardant and self-extinguishing properties, suitable for high humidity and dusty railway environments. Electrical Parameters:Rated Capacity: 800 kVA •HV Voltage: 11 kV ± 5% (Off-circuit tap links in steps of 2.5%) •LV Voltage: 433 V ,Frequency: 50 Hz ,Cooling: AN (Air Natural) •Vector Group: YNyn0 ,Insulation Class: H (180°C) •Impedance: As per manufacturer standard (typically 5-7%) Constructional Features: •Vacuum pressure impregnated epoxy resin cast HV & LV windings ,Copper conductor windings with high conductivity electrolytic grade copper ,Epoxy resin encapsulation for moisture, dust, and chemical resistance •Robust mechanical structure with vibration-resistant core clamping ,CRGO silicon steel laminated core for low no-load losses and noise reduction Off-Circuit Tap 1 Changer: •Off-load tap links provided on HV side ,Tap range: +5% to -5% in 2.5% steps (5 positions minimum) ,Suitable locking arrangement to prevent accidental operation Standard Accessories & Fittings:01 No. HV cable box (suitable for 11 kV XLPE termination) ,01 No. LV cable box (busduct/cable termination suitable for 433 V system) ,01 No. Winding Temperature Indicator (WTI) with digital scanner type sensor and alarm/trip contacts ,01 No. Rating & Diagram plate (laser engraved aluminium/stainless steel) ,02 Nos. Earthing terminals (GI/copper compatible) ,01 No. Separate neutral bushing (LV side) ,04 Nos. Lifting lugs (mechanically tested for full transformer weight) ,04 Nos. Bi-directional rollers for site movement ,01 No. Marshalling box with control wiring termination, relays, and terminal blocks ,Internal interconnection and earthing with GI strip/copper braid as per design Installation & Works Scope: •Shifting, unloading, and positioning on plinth ,Alignment, levelling and vibration-free installation ,HT/LT cable termination including gland, lugging, and ferruling ,Proper earthing system connection (double earthing of body & neutral) using GI strip as per IEC/IE rules , oTesting & commissioning including: IR (Insulation Resistance) test ,Vector group test ,Ratio test ,Winding resistance test oFunctional testing of WTI and alarms •Ensuring compliance with IE Rules 1956 / CEA Regulations / Indian Railways electrical standards Standards & Compliance: •IS 11171 / IEC 60076-11 (Dry Type Transformer) ,IS 2026 (Power Transformer general requirements) ,IEEE / IEC thermal and dielectric standards ,Approved Railway electrical safety norms . All work including manpower, tools & tackles, testing instruments, crane handling, transportation, and incidental works shall be included and executed as per direction of the Engineer-in-Charge.

Description :Supply, erection, testing & commissioning of 100 AH , 110 V, rechargeable Lithium Iron Phos phate (LiFePO4) Battery Pack with complete accessories for different Sub-Station of Metro Railway, Kolkata as per Metro Railway specification no. MR/EL/110 V, 100 Ah Advance Chemistry Battery/2025 [ Warranty Period: 60 Months after the date of delivery ] ] Consignee SSE/M/MB, METRO West Bengal 1.00 Set Inspection Details Stage Inspection Not Required

soil/hardmurrum/tar road/below Railway track. After this the cable shall be laid and then both sides

1840.00 sleepers with all Railway supplied fittings complete for TBTR work to specified gauge under traffic block with contractor's tools including aligning, levelling to make track fit for 20 kmph speed and as directed by Engineer in-charge. Note: Transportation of track material if supplied beyond 250m of bridge approaches, shall be paid separately under relevant item.

529.00 sleepers with all Railway supplied fittings complete for TBTR work to specified gauge under traffic block with contractor's tools including aligning, levelling to make track fit for 20 kmph speed and as directed by Engineer in- charge. Note: Transportation of track material if supplied beyond 250m of bridge approaches, shall be paid separately under relevant item.

Providing horizontal directional drilling (HDD) for crossing below railway track / dense area including excavation of pits and laying of 160 mm dia HDPE pipe, complete in all respects.