Tender For Special Repair To Transformer At 33 Kv Udasar Sub Station At Mil Stn Bikaner Under Ge (N) Bikaner
Tender Value
1.28 Crore
Estimated cost
Bid Submission
04 Dec 2026
27 days left
EMD
2.03 Lakhs
Bank guarantee accepted
Document Fee
1000
Non-refundable
Tender Type
Online
Tender Overview
Organization
Tender ID
Competition Type
NCB
Bidding Type
Tender
Location / State
Bikaner → Rajasthan
EMD Exemption
Available
Quantity
Not Available
Website
Contact Person
Address
Project Description
Tender for Special Repair To Transformer At 33 Kv Udasar Sub Station At Mil Stn Bikaner Under Ge (N) Bikaner
BOQ
| Sl. No. | Item Description |
| 1 | Dismantling old unservicable 4 pole structure with PCC pole and connected items complete all as specifioed and as directed by Engr-in-charge. Note :- Disposal of materials from site is also included in the unit rate quoted. |
| 2 | Taking down old unservicable XLPE cable of any size or capacity complete all as specifioed and as directed by Engr-in-charge. |
| 3 | Taking down old unservicable Lightening arrester including all accessories complete all as specifioed and as directed by Engr-in-charge. |
| 4 | Supply, Installation ,Testing and Commissioning of Power Transformer with OLTC, Neutral Grounding Arrangement, and Remote VCB Inter-Tripping (External) outdoor type, step-down, oil-immersed Power Transformer of capacity 5000 kVA, 33 kV / 11 kV, 3-phase, 50 Hz, Dyn11, copper wound, ONAN cooled, conforming strictly to IS 2026 (Parts 1 to 5), IS 335, and CBIP Manual, complete with On-Load Tap Changer (OLTC) with Remote Tap Changer Cubicle (RTCC), Neutral Grounding Bank with dedicated Neutral CT, Buchholz protection, comprehensive safety instrumentation, weather-proof Marshalling Box, and complete inter-panel control cabling for integrated operation and tripping from the remote Vacuum Circuit Breaker (VCB) switchboard.Detailed Technical Specifications : - |
| 5 | 1. General Electrical Parameters & Performance |
| 6 | * Rated Capacity: 5000 kVA (continuous ONAN rating). |
| 7 | * Voltage Ratio: Primary 33 kV (Nominal), Secondary 11 kV (Nominal). |
| 8 | * No. of Phases & Frequency: 3-Phase, 50 Hz (+ OR - 5%). |
| 9 | * Vector Group: Dyn11 (Delta connected HV, Star connected LV with neutrally brought-out point). |
| 10 | * Core & Windings: High-permeability, cold-rolled grain-oriented (CRGO) silicon steel laminations. Windings shall be double-wound, electrolytic high-conductivity grade copper with Class 'A' insulation. |
| 11 | * Percentage of Impedance: 5% at normal common tap (Tap No. 7), subject to standard IS tolerances. |
| 12 | * Temperature Rise Limits: Maximum oil temperature rise not exceeding 50 degree celcious above ambient by thermometer; maximum winding temperature rise not exceeding 55 degree celcious above ambient by resistance measurement (designed for maximum ambient temperature of 50 degree celcious). |
| 13 | * Insulating Oil: First filling of fresh, inhibited, or uninhibited EHV grade mineral insulating oil complying strictly with IS 335, supplied complete with 20% excess oil in non-returnable sealed drums , drums to hand over to AGE E/M store yardand rate is inclusive for excess oil quantity. |
| 14 | * Tank & Paint: Mild steel electrically welded construction designed to withstand full vacuum and internal pressure as per IS standards. Tank treated with shot blasting and finished with two coats of epoxy primer and two coats of polyurethane/epoxy finishing paint (shade 631/632 as per IS 5). |
| 15 | 2. Bushings & Terminal Arrangements : |
| 16 | * HV Terminals (33 kV): 03 Nos. outdoor bare porcelain bushings with bi-metallic terminal connectors suitable for connecting to overhead ACSR conductor / 33 kV bare bus. |
| 17 | * LV Terminals (11 kV): 03 Nos. outdoor porcelain cable-end terminals / bushed terminal connectors housed inside a weather-proof cable end box suitable for terminating multiple runs of 11 kV, 3-Core, HT XLPE armored aluminum/copper power cables. |
| 18 | * Neutral Terminal: 01 No. fully rated, outdoor solid porcelain bushing mounted on the transformer lid for neutral earthing. |
| 19 | * 02 Nos Set of End Joint kit heat shrinkable, 11 KV and 33 KV joint to both end of HT cable. No extra payment shall be made for end joint kit. |
| 20 | 3. Neutral Grounding Bank & Restricted Earth Fault (REF) Arrangement |
| 21 | * Neutral Current Transformer (NCT): 01 No. outdoor, single-phase, bushing-mounted/independent NCT provided on the neutral terminal lead for Restricted Earth Fault (REF / 64R) protection. |
| 22 | * Specification: Class PS, secondary current 1A or 5A, minimum knee-point voltage matching the phase CTs on the 11 kV switchgear, low excitation current, and resistance matching the overall unit protection scheme. |
| 23 | * Neutral Grounding Resistor (NGR) / Grounding Bank: |
| 24 | * Free-standing, outdoor floor-mounting, weather-proof (IP33/IP55) galvanized iron/CRCA enclosure housing a stainless steel / FeCrAl non-inductive resistance grid. |
| 25 | * Rating: Designed to limit secondary ground fault current to rated capacity (e.g., 300A/400A for 10–30 seconds). |
| 26 | * Accessories: Off-load manual disconnect/isolator switch, auxiliary copper earthing bar, incoming copper busbar, and potential-free open/close status contacts wired to the control room. |
| 27 | * Earthing Pad: 02 Nos. copper-faced distinct earthing terminals with M12 hardware provided at diagonally opposite corners of the transformer tank for solid grounding to the station earth mat. |
| 28 | 4. On-Load Tap Changer (OLTC) & Remote Tap Changing Cubicle (RTCC) |
| 29 | * OLTC Specification: Outdoor, high-speed, resistor-transition, oil-immersed type combining diverter and selector mechanism housed in an isolated compartment with separate oil surge protection (Makes: Easun MR / CTR / CGL). |
| 30 | * Tapping Range: +5% to -15% in 16 equal steps of 1.25% (total 7 tapping positions). |
| 31 | * Motor Drive Unit (MDU): Suitable for 415 V, 3-phase, 50 Hz AC supply, equipped with self-retaining thermal overload protection, mechanical tap indicator, manual hand-crank handle with electrical interlock, local \\"Raise/Lower\\" push buttons, and Local/Remote control selector switch. |
| 32 | * Remote Tap Changer Cubicle (RTCC Panel): |
| 33 | * Indoor, sheet-steel enclosed (1.6 mm/2.0 mm CRCA, IP5X), floor/wall-mounting cubicle placed in the substation control room. |
| 34 | * Fitted with: * Digital Tap Position Indicator (DTPI) with 4–20 mA transducer output. |
| 35 | * Solid-state Automatic Voltage Regulating Relay (AVR) with line drop compensation and time-delay setting. |
| 36 | * Remote \\"Raise/Lower\\" control switches / push buttons. |
| 37 | * Auto / Manual selector switch. |
| 38 | * Step-by-step controller, Out-of-Step protection relay, and motor runaway protection timer. |
| 39 | * Audio-visual annunciation window for: Tap Change In Progress, Motor Supply Fail, Out-of-Step, and Diverter Oil Surge. |
| 40 | 5. Safety Devices, Instrumentation, and Gauges |
| 41 | * Buchholz Relay: Double-float, magnetically operated oil-surge and gas-accumulation relay (conforming to IS 3637) installed in the connecting pipe between tank and conservator, complete with shut-off isolating valves on either side and test cocks. |
| 42 | * Equipped with two independent sets of electrical contacts: |
| 43 | * Upper float (Alarm): Initiates control room warning on minor gas buildup. |
| 44 | * Lower float (Trip): Initiates simultaneous master inter-trip on heavy oil surge. |
| 45 | * Pressure Relief Device (PRD / PRV): Spring-loaded diaphgram-type mechanical pressure release device mounted on the top cover with an equalizer pipe, visual mechanical pop-up indicator, and two potential-free microswitch contacts wired to the master trip circuit. |
| 46 | * Oil Temperature Indicator (OTI): 150 mm dial-type vapour/stem thermometer with maximum pointer and resetting knob. Fitted with 02 sets of adjustable electrical contacts (1 for High Oil Temp Alarm, 1 for High Oil Temp Trip). |
| 47 | * Winding Temperature Indicator (WTI): 150 mm dial-type indicator fed through a dedicated thermal-imaging CT fitted inside the tank. Fitted with 02 sets of adjustable contacts (1 for High Winding Temp Alarm, 1 for High Winding Temp Trip). |
| 48 | * Magnetic Oil Level Gauge (MOG): 100 mm dial magnetic level gauge installed on the conservator with dial markings for 30degree celcious filling level, complete with low-level electrical alarm contacts. |
| 49 | * Breather: Double-compartment dehydrating breather filled with silica gel and transparent oil-seal cup at the bottom. |
| 50 | * Valves & Fittings: Top/bottom filter valves, sampling valves, bottom main drain valve, inspection covers, radiator isolating valves, air release plugs, bi-directional flat-treaded rollers, hauling holes, and jacking lugs. |
| 51 | 6. Marshalling Box & Remote VCB Interfacing Scheme |
| 52 | * Marshalling Box: Weather-proof, vermin-proof, outdoor type (IP55 protection), fabricated from minimum 2.0 mm thick sheet steel with a sloped canopy and double door. Mounted rigidly on the transformer tank or on a separate plinth. |
| 53 | * Fitted with thermostat-controlled space heater, door switch, internal utility lamp, and heavy-duty disconnect-type terminal blocks (660 V grade, 10A). |
| 54 | * Wiring & Inter-Tripping Logic to Remote 33 kV / 11 kV VCB Panels: |
| 55 | * All alarm and trip contacts from the transformer safety devices shall be pre-wired to the Marshalling Box using 1100 V grade, 4.00 sqmm multi-strand flexible copper conductors. |
| 56 | * Multi-core, 1100 V grade, PVC/XLPE insulated, steel-wire armored copper control cables 4.00/6.00 sq mm shall be supplied, laid, and terminated between the Marshalling Box, the RTCC Panel, and the Remote 33 kV Incomer & 11 kV Outgoing VCB Switchgear. |
| 57 | * The trip scheme shall be wired to the substation Master Trip Relay (ANSI Device 86) in fail-safe DC tripping mode (110 V DC or 30 / 36 V DC as per substation bus supply). |
| 58 | * Initiating Device, Sensing Condition, Assigned Action | Interface Destination. |
| 59 | * Buchholz Relay, Gas accumulation, Alarm, Remote VCB Annunciator. |
| 60 | * Buchholz Relay, Oil surge, Severe fault, Inter-Trip (Trips both 33 kV & 11 kV VCBs), Master Trip Relay (86). |
| 61 | * Pressure Relief Valve (PRV), Sudden tank overpressure, Inter-Trip (Trips both 33 kV & 11 kV VCBs), Master Trip Relay (86). |
| 62 | * WTI (Winding Temp Indicator), Over-temperature stage 1, Alarm, Remote VCB Annunciator. |
| 63 | * WTI (Winding Temp Indicator), Over-temperature stage 2, Inter-Trip (Trips both 33 kV & 11 kV VCBs), Master Trip Relay (86). |
| 64 | * OTI (Oil Temp Indicator), Over-temperature stage 1, Alarm, Remote VCB Annunciator. |
| 65 | * OTI (Oil Temp Indicator), Over-temperature stage 2, Inter-Trip (Trips both 33 kV & 11 kV VCBs), Master Trip Relay (86). |
| 66 | * Magnetic Oil Gauge (MOG), Low oil level limit, Alarm, Remote VCB Annunciator. |
| 67 | * Neutral Grounding (NCT/REF), Internal winding ground fault, Instantaneous Trip (Both 33 kV & 11 kV VCBs), Differential, REF Relay. |
| 68 | * OLTC Protection, Out-of-step, Motor stall, PRV, Alarm & Tap Block,|RTCC & Annunciator, |
| 69 | 7. Testing, Inspection, and Commissioning |
| 70 | * Factory Routine Tests: All standard tests as per IS 2026 (Part 1) including winding resistance, voltage ratio, polarity & phase relationship, no-load loss and current, load loss and impedance voltage, insulation resistance, dielectric withstand test, and OLTC functional tests at the manufacturer's works before dispatch. |
| 71 | * Site Pre-Commissioning Tests: Insulation resistance test (Megger), winding resistance measurement, magnetic balance test, ratio test on all 7 taps, transformer oil breakdown voltage (BDV) and moisture content test, Buchholz and PRV contact simulation trip test, RTCC automatic/manual voltage regulation test, and end-to-end electrical trip test confirming tripping of the remote 33 kV and 11 kV VCBs. Please Enable Macros to View BoQ information |
| 72 | * Site Pre-Commissioning Tests: Insulation resistance test (Megger), winding resistance measurement, magnetic balance test, ratio test on all 7 taps, transformer oil breakdown voltage (BDV) and moisture content test, Buchholz and PRV contact simulation trip test, RTCC automatic/manual voltage regulation test, and end-to-end electrical trip test confirming tripping of the remote 33 kV and 11 kV VCBs. Please Enable Macros to View BoQ information |
AI Tender Summary
Tender Timeline
Nov 06, 2026
11:30 IST
Tender Published
Tender notice published.
CompletedDec 04, 2026
17:00 IST
Bid Submission Deadline
Online submission via eProcurement portal.
Upcoming · 27 daysDec 11, 2026
Bid Opening Date
Technical bids will be opened and evaluated.
Upcoming · 34 daysTender Documents
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