Power Transformer, Oil immersed type
Western Coalfields Limited
CHANDRAPUR, MAHARASHTRA
Posted:
16 May 2025
Closed:
6 June 2025
GEM
GEM
Bids are Invited For Power Transformer, Oil immersed type in JODHPUR, RAJASTHAN
Progress
Issue12-Jun-2026, 5:45 pm
AwardPending
Quantity
2
Bid Type
Single Packet Bid
Categories
9
North Western Railway has released a public tender for Power Transformer, Oil immersed type (Q3) in JODHPUR, RAJASTHAN. Quantity: 2. Submission Deadline: 06-07-2026 13: 00: 00. Download documents and apply online.
Additional Tender Data
Commercial Details
Tender Category
Goods
Bid To RA
No
Bid To RA Enabled
No
Item Category
Power Transformer, Oil immersed type (Q3)
Authority Records
MINISTRY OF RAILWAYS
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Documents 4
GeM-Bidding-9453343.pdf
Main Document
CATALOG-Specification-1
CATALOG Specification
Buyer uploaded ATC document
ATC
GEM General Terms and Conditions Document
GEM_GENERAL_TERMS_AND_CONDITIONS
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Tender Results
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Technical Specifications
1 Item
Item #1 Details
View Catalog| Category | Specification | Requirement |
|---|---|---|
| RATING | Rated Voltage - HV (in KV) | 33 |
| RATING | Rated Voltage - LV (in kV) | 11 |
| RATING | Maximum system voltage - HV (in kV) | 12, 24, 36, 72.5, 145, 245, 420, 800, 3.6, 7.2 |
| RATING | Maximum system voltage - LV (in kV) | 36 |
| RATING | Rated power (in MVA) | 5, 6.3, 8, 10, 12.5, 16, 20, 32, 40, 6.5, 30, 30.4, 33.3, 42, 50, 63, 66.7, 80, 100, 150, 160, 166.7, 200, 250, 315, 500, 1, 3.15 |
| RATING | No. of Phase | 3 |
| RATING | Frequency | 50 Hz, ± 5% |
| GENERIC | Conformity of the specification | IS:2026 (Part 1) : 2011 latest, IS:2026 (Part 1) : 2011 latest and as per Annexure - A attached for Coal India, as per IEC:60076:2011 latest |
| GENERIC | Designed for | Outdoor |
| GENERIC | Installation, Testing and Demonstration | Yes, No, Yes. Including civil works related to installation and commissioning of transformer |
| INSULATION LEVEL | Insulation Levels, Dielectric Tests and External Clearances in Air | as per IS: 2026 Part 3: 2009 latest, as per IEC:60076:2011 latest |
| INSULATION LEVEL | Standard rated short duration power-frequency withstand voltage, r.m.s value (in kV) | 70 (for 33 KV) |
| INSULATION LEVEL | Standard rated lightning impulse withstand voltage (in kV, peak) | 170 |
| WINDING | Winding insulation | Class A |
| WINDING | Connection symbol | Dyn 11, Star / Star (YNyno), Not applicable, HV- Star, Delta LV- star, Delta |
| WINDING | Terminals of all windings | Out of the tank through bushings for external connections, With cable box |
| WINDING | Material of barrier insulation including spacers | High Density Press board |
| TAP CHANGER | Type of Tap Changer | Off Circuit, On Load, NA |
| TAP CHANGER | Winding tapped at | HV |
| TAP CHANGER | No. of tappings (in Nos.) | 9 |
| TAP CHANGER | Range of tappings | +10% to -10% in equal seps of 1.25%, +5% to-15% in equal seps of 1.25%, +5% to-5% in equal seps of 7.5%, NA, Tap range : - 15% to + 5% Rate of steps : 1.25 %of 132kv, (‒) 9 % to (+) 3% |
| CONSTRUCTION | Material of core | CRGO (ColdRolled GrainOriented steel) |
| CONSTRUCTION | Core assembly | Bolted type |
| CONSTRUCTION | The maximum flux density in any part of the cores and yoke at normal voltage and frequency | < 1.5 Tesla, < 1.7 Tesla, < 1.9 Tesla, < 1.6 Tesla |
| CONSTRUCTION | Type of cooling | ONAN |
| CONSTRUCTION | Transformer filled with oil | Yes |
| CONSTRUCTION | Method of system earthing | LV Winding: Solidly earthed, HV connections : Star with neutral solidly earthed, LV connections : Star with neutral solidly earthed, Neutral of HV,LV solidly earthed |
| CONSTRUCTION | Type of oil preservation system | Conservator type |
| CONSTRUCTION | Temperature rise limit - Top oil measured by thermometer | < 50 deg. C |
| CONSTRUCTION | Temperature rise limit - Winding temperature by resistance | < 45 deg. C, < 55 deg. C |
| CONSTRUCTION | Percentage of impedance voltage on normal tap and MVA base at 75 deg. C corresponding to HV/ LV rating (in %) | 6.25 |
| CONSTRUCTION | No Load Losses (Fixed Loss) , Maximum (in KW) | 3, 4, 4.6, 5.5, 7, 7.5, 16, 25, 9, 10, 12, 14, 18, 30, 35, 45, 60, 70, 75, 90 |
| CONSTRUCTION | Load losses at 75°C, Maximum ( in KW) | 16, 23, 36, 40, 50, 65, 130, 185, 80, 90, 95, 110, 125, 140, 200, 245, 260, 400, 440, 450, 500 |
| CONSTRUCTION | Minium Creppage Distance (in mm) | HV-900 mm, LV-300 mm |
| TRANFORMER TANK | Transformer tank construction shall conform in all respect to | Clause 15 of IS 1180(Part1):2014. |
| TRANFORMER TANK | Transformer tank top cover | Detachable with bolted flanged gasket joint |
| TRANFORMER TANK | The color of the finishing coats | Dark admiral grey conforming to No.632 of IS:5 (1961) |
| TRANFORMER TANK | The surface of the cover | Suitable sloped, as per Annexure-A attached for Coal India, Flat |
| TRANFORMER TANK | The transformer tank | supported on steel structure |
| ADD ON ITEMS | Oil conservator tank (in Nos.) | 1 |
| ADD ON ITEMS | Buchholz Relay | 1 |
| ADD ON ITEMS | Oil Temperature Indicator (OTI) (in Nos.) | 1 |
| ADD ON ITEMS | Winding Temperature indicator (WTI) (in Nos.) | 1 |
| ADD ON ITEMS | Pressure Relief Device (in Nos.) | 1 |
| ADD ON ITEMS | Oil Level Indicator (in Nos.) | 1 |
| ADD ON ITEMS | Silica Gel Breather with Silica Gel (in Nos.) | 1 |
| ADD ON ITEMS | Drain Valve on transformer tank (in Nos.) | 1 |
| ADD ON ITEMS | Filter Valve on transformer tank (in Nos.) | 1, 2, 0 |
| ADD ON ITEMS | Oil sampling valve on transformer tank (in Nos.) | 1, 0, 2 |
| ADD ON ITEMS | Air release plug (in Nos.) | 15 mm NB 1 no. |
| ADD ON ITEMS | Lifting eyes or lugs for the top cover, core and coils and for the complete transformer | Yes |
| ADD ON ITEMS | Tank earthing terminals with associated nuts and bolts for connections to grounding strip | 2 sets, 0 |
| ADD ON ITEMS | HV Bushings according to highest system voltage (in Nos.) | 2 (Porcelain), 3 (Porcelain), 0, 1 No. Porcelain with metal parts and gaskets |
| ADD ON ITEMS | LV Bushings according to highest system voltage (in Nos.) | 2 (Porcelain), 3 (Porcelain), 0, 1 No. Porcelain with metal parts and gaskets |
| ADD ON ITEMS | Terminal arrangement: for HV/LV bushings with arcing horns | Yes, No |
| ADD ON ITEMS | Suitable terminal connector for HV & LV terminal for holding Conductor | Yes. Suitable for Panther type, No |
| ADD ON ITEMS | Bus Bars | No |
| ADD ON ITEMS | Cable termination box | 1 No. at LV side |
| ADD ON ITEMS | Arrangement for Auxilary supply voltage for | For Alarm, For Relays, NA |
| ADD ON ITEMS | Marshalling box with required glands, locks, glass door, terminal Board, heater with switch, illumination lamp with switch etc to accommodate temperature indicators terminal blocks etc | 1 |
| ADD ON ITEMS | Ingress protection for Marshalling Box | IP 55, IP 54 |
| ADD ON ITEMS | Padlocks and locking key arrangements for | Mrashalling box |
| ADD ON ITEMS | Foundation bolts for wheel locking devices of Transformer | Yes |
| ADD ON ITEMS | Bi-metallic terminal connector/ clamp/ washers suitable for fixing to bushing terminals | Yes, No |
| ADD ON ITEMS | Other requrements | Air release plug, 1 No., Rating Plate, NA, 1 No. Neutral Bushing, Metal parts for Bushings, Gaskets for Bushings, Magnetic oil level gauge: 1 No., Magnetic Oi Level Gauge with Low oil level alarm contacts, 1 No. Cooler fan with motor, HV & LV neutral : brought out on separate bushing, 1 No. Dial type thermometer, Thermometer: Maximum reading pointer, Thermometer: adjustable, Thermometer: Poterntial free contacts for alarm and trip for top oil temperature ., Additional pockets for mercury-in-glass thermo meter for measuring oil and winding temperature, Explosion/ relief vent with double diaphragm equalizer connection, Diagram plates, Terminal marking plate, Identification marking plate, Approved Pressure Relief Device for Rapid Release of Pressure, Under carriage with jacking pads, Under carriage with hauling holes / hook, Supervisory alarm for oil temperature indicator, Supervisorytrip contacts for oil temperature indicator, Supervisory alarm for gas operated double float relay, Supervisory trip contacts for gas operated double float relay, Supervisory alarm contacts for oil level indicator, Inspection cover, Oil filling hole and cap, Thermometer for Oil Temp Indicator 150mm, Dial Type. |
| ADD ON ITEMS | Agreed for unloading of transformer at site | Yes |
| SPECIAL TEST | Agreed to furnish special test reports as per | Cl.10.1.3 of IS:2026 (Part 1) latest, NA |
| SPECIAL TEST | Test reports for dielectric special tests | Yes, No |
| SPECIAL TEST | Test report for determination of capacitances winding to earth, and between windings | Yes, No |
| SPECIAL TEST | Test report for determination of transient voltage transfer characteristics | Yes, No |
| SPECIAL TEST | Test reports for measurement of zero sequence impedance (s) on three phase transformers | Yes, No |
| SPECIAL TEST | Test report for determination of sound levels | Yes, No |
| SPECIAL TEST | Test report for measurement of harmonics of the no load current | Yes, No, Yes. Including Contact Resistance Test (<2 miliohm) |
| SPECIAL TEST | Test report for measurement of the power taken by the fan and oil pump motors | Yes, No, Yes. Including Measurement of Impedance voltage at highest rated and lowest voltage taps |
| SPECIAL TEST | Test report for measurement of insulation resistance to earth of the windings and or measurement of dissipation factor of the insulation system capacitances | Yes, No, Yes. Including Ratio and high voltage magnetisation current test. |
| CERTIFICATIONS | Agreed for stage inspection as and when required by buyer / consingee | Yes as per buyer requirements, No |
| CERTIFICATIONS | Agreed to furnish Guaranteed Technical Particulars (GTP) and complete drawings of Power Transformer as and when required by buyer / consignee | Yes |
| CERTIFICATIONS | Agreed to furnish routine test reports to buyer / consingee on demand | as per Cl.10.1.1 of IS:2026 (Part 1) latest, No, as per Annexure-A attached for Coal India |
| CERTIFICATIONS | Availability of Type test report from Central Government/NABL/ILAC accridiated laoratory to prove conformity of the specification | Yes, No, as per Annexure-A attached for Coal India |
| CERTIFICATIONS | Agreed to furnish routine and type tet reports for porcelain bushings | Yes, No |
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Historical Data
Required Documents
1
Past Performance
2
Certificate (Requested in ATC)
3
OEM Authorization Certificate
4
Additional Doc 1 (Requested in ATC) *In case any bidder is seeking exemption from Experience / Turnover Criteria
5
the supporting documents to prove his eligibility for exemption must be uploaded for evaluation by the buyer
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Documents 4
GeM-Bidding-9453343.pdf
Main Document
CATALOG-Specification-1
CATALOG Specification
Buyer uploaded ATC document
ATC
GEM General Terms and Conditions Document
GEM_GENERAL_TERMS_AND_CONDITIONS