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West Bengal Transport Corporation Limited Distribution Transformer Tender 11kV 3-Phase 200-2500 kVA IS 1180 2026

Bid Publish Date

24-Jan-2026, 10:03 am

Bid End Date

10-Feb-2026, 12:00 pm

Location

KOLKATA , WEST BENGAL

Progress

Issue24-Jan-2026, 10:03 am
AwardPending
Explore all 4 tabs to view complete tender details

Quantity

1

Bid Type

Two Packet Bid

Tender Overview

West Bengal Transport Corporation Limited invites bids for a 3-Phase distribution transformer category, specified for 11 kV > 200 KVA up to 2500 KVA. The procurement includes installation, testing, commissioning, and operator training within the scope, with statutory clearances where applicable. The tender emphasizes energy efficiency levels, BEE star rating, and multiple standard tests, including stage inspections and sound/noise testing. A minimum warranty is expected on receipt and after installation, with optional fittings and accessories detailed. The contract reserves quantity adjustment up to 25%, and requires a dedicated service center in the consignee state, or establishment within 30 days of award, with a 2-year OEM warranty. This is a comprehensive transformer procurement and support package under West Bengal’s Transport Department guidelines.

Technical Specifications & Requirements

  • Standards: energy efficiency level, BEE Star Rating, installation, testing, demonstration, and minimum warranty terms.
  • Ratings: Nominal HV voltage 11 kV, LV voltage in volts, standard rating in kVA up to 2500, minimum insulation level in kVP, highest system voltage, and lightning impulse withstand (per IS:1180 Part 1:2014 Annex-D).
  • Construction: core and winding materials, mounting type, tank material and thickness (top/bottom/side), gaskets, conservator, painting per IS:1180 Table 12, oil-related tests.
  • Terminal & fittings: bushings on HV/LV sides, cable end boxes, rating plates, marking, optional fittings (lightning arrestors, Buchholz, oil indicators, valve, etc.).
  • Tests & certifications: type test reports, stage inspections, sound level, short-circuit withstand, oil BDV/moisture, painting adhesion; OT oil temperature indicators and more.
  • Other: windings with tap changer positions, altitude limits, and service/maintenance requirements. Warranties and service benchmarks are clearly defined, with a 2-year warranty period.

Terms & Eligibility

  • EMD: amount not disclosed in available data; submit as per formal tender documents.
  • Warranty: 2 years from final acceptance or after installation/commissioning; certificates to be provided by OEM.
  • Delivery & Support: supply, installation, testing, commissioning, training; dedicated service center in-state or within 30 days of award; toll-free service support and escalation matrix.
  • Payment: terms unspecified in the provided data; bidders must align with the purchaser’s standard terms and conditions.
  • Quantity Flexibility: purchaser may increase/decrease quantity by up to 25%; extended delivery period calculated per clause; minimum 30 days for any extension.

Key Specifications

  • 3-Phase 11 kV distribution transformers

  • Rated capacity up to 2500 kVA, standard kVA ratings

  • IS:1180 Part 1:2014 type tests and annexure for insulation, BDV, moisture

  • Oil conservator and tank construction with specified thickness

  • Table 12 painting requirements for internal and external surfaces

  • BEE energy efficiency level and star rating requirements

  • No-load current at 112.5% voltage test and short-circuit withstand test

  • Optional fittings: Buchholz relay, oil temp indicators, cable end boxes

Terms & Conditions

  • Up to 25% quantity variation with extended delivery clauses

  • 2-year OEM warranty post-acceptance or post-installation

  • Functional Service Centre in-state or establish within 30 days

  • Supply, installation, testing, commissioning, and operator training included

  • Stage inspections, sound level, and specific test reports required

Important Clauses

Payment Terms

Payment terms to be as per purchaser's standard conditions; ensure alignment with 30/60/90 day cycles post acceptance.

Delivery Schedule

Delivery commencement from the last date of original delivery order; option-driven extensions governed by formula with minimum 30 days.

Penalties/Liquidated Damages

Penalties for delayed delivery and non-conformance to IS 1180 criteria; LD terms to be as per tender terms.

Bidder Eligibility

  • Proven experience supplying 3-Phase distribution transformers up to 2500 kVA

  • ISI/BIS or IS 1180 compliant product and test documentation

  • Functional service center in West Bengal or ready to establish within 30 days

Documents 3

GeM-Bidding-8881251.pdf

Main Document

CATALOG-Specification-1

CATALOG Specification

GEM General Terms and Conditions Document

GEM_GENERAL_TERMS_AND_CONDITIONS

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Technical Specifications 1 Item

Item #1 Details

View Catalog
Category Specification Requirement
STANDARDS Energy efficiency level 1
STANDARDS BEE Star Rating 1
STANDARDS Installation, Testing and Demonstration No
STANDARDS Minimum warranty on receipt of stores (in Months) 30
STANDARDS Minimum warranty from the date of installation (in Months) 24
RATINGS Nominal system voltage, HV ( in kV) 11
RATINGS Nominal system voltage, LV ( in V) 415
RATINGS Standard ratings (in kVA) 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500
RATINGS Minimum basic insulation level (in kVP) 75
RATINGS No load voltage ratios (in Volts) 11000/433-250
RATINGS Highest system voltage for equipment (in kV) 12
RATINGS Rated lightning impulse withstand voltage (in kV Peak) (Refer IS:1180 (Part 1):2014 Annex-D) 75
CONSTRUCTION Core mateial CRGO (as per IS:3024 latest)
CONSTRUCTION Conductor (Winding) material Copper
CONSTRUCTION Type of Mounting Pole Mounted
CONSTRUCTION Noise level at rated voltage and freqeuncy, Maximum (in dB) 45
TRANSFORMER TANK Transformer tank cover construction Non-sealed, Bolted
TRANSFORMER TANK Tank configuration with With radiator fins
TRANSFORMER TANK Material of transformer tank Mild Steel
TRANSFORMER TANK Minimum thickness of top and bottom material of transformer tank (in mm) 6
TRANSFORMER TANK Minimum thickness of side material of transformer tank (in mm) 4
TRANSFORMER TANK Material of Bolts/Nuts/Wahers exposed to atmosphere Stainless steel (for upto 12 mm size), Brass (for upto 12 mm size), Electro Galvanized (for above 12 mm size), Hot Dip Galvanized (for above 12 mm size)
TRANSFORMER TANK Gaskets wherever used shall conform to Type III (as per IS:11149) Type C (as per IS:4253 (Pt.2)
TRANSFORMER TANK Provision of conservator Yes , for Non sealed type with Plain tank construction
Painting Type of painting on inside of tank (hint: Refer Table 12 of IS:1180 (Pt.1):2014) Oil resistant paint
Painting Type of painting on External surface of tank (hint: Refer Table 12 of IS:1180 (Pt.1):2014) Epoxy (Primer), Polyurethane (finish coat)
TAP CHANGER Winding tapped HV
TAP CHANGER No. of positions (in Nos.) 7
TAP CHANGER Voltage variation +5% to -10% in steps of 2.5% for variation of HV
TERMINAL ARRANGEMENT Transformer fitted with bushings of appropriate voltage and curent ratings on HV side Yes. 3 Nos. (Conforming to IS:2099)
TERMINAL ARRANGEMENT Transformer fitted with bushings of appropriate voltage and curent ratings on LV side Yes. 4 Nos. (Conforming to IS:7421)
TERMINAL ARRANGEMENT Suitable provision for adoption of cables of suitable size on LV side Yes. For PVC/XLPE Cables
TERMINAL ARRANGEMENT Cable End Box on HV side No
TERMINAL ARRANGEMENT Cable End Box on LV side Yes
MARKING Material of rating plate Anodized aluminium
MARKING Marking method on rating plate Etching
MARKING Rating and terminal marking plates combined into one plate Yes
OPTIONAL FITTINGS Suitable rating lightning arrestors HT Side, 1 No. per phase
OPTIONAL FITTINGS Bird guard No
OPTIONAL FITTINGS Terminal connectors Yes
OPTIONAL FITTINGS Oil temperature indicator and widning temperature indicator Yes
OPTIONAL FITTINGS Jacking pads No
OPTIONAL FITTINGS Buchholz relay NoMagnetic oil level gauge with low oil level alarm contact
OPTIONAL FITTINGS Magnetic oil level gauge with low oil level alarm contact Yes for transformer above 1600
OPTIONAL FITTINGS Non return valve Yes
OPTIONAL FITTINGS Protection relay for sealed type transformers for internal parameters that is pressure, temperature, oil level and gas detection No
OPTIONAL FITTINGS Unidirectional flat rollers Yes
OPTIONAL FITTINGS Drain cum sampling valve Yes with steel plug (for transformers upto 500 KVA)
OPTIONAL FITTINGS Self protection / disconnection devices No
OPTIONAL FITTINGS Expulsion fuse as disconnection device No
SERVICE CONDITION Maximum altitude <5000 m
TEST REPORTS & CERTIFICATIONS Availability of type test reports to prove the confirmity of the specification from NABL Accrediated
TEST REPORTS & CERTIFICATIONS Agreed for stage Inspection as required by buyer Yes
SPECIAL TEST REPORTS Availability of test report for Determination of sound level test No
SPECIAL TEST REPORTS Availability of test report for short circuit withstand test Yes
SPECIAL TEST REPORTS Availability of test report for No load current at 112.5 % Voltage Yes
SPECIAL TEST REPORTS Availability of test report for Paint adhesion test No
SPECIAL TEST REPORTS BDV and moisture content of oil in the transformer Yes for 1 No.
SPECIAL TEST REPORTS Other requirements Losses and Impedance values as per Cl.7.8 and Table 6 of IS:1180 (Part 1):2014 latest, Limits of temeprature-rise as per Cl.7.10 of IS:1180 (Part 1):2014 latest

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Required Documents

1

GST registration certificate

2

PAN card

3

Experience certificates for similar transformer supply/installations

4

Financial statements or turnover evidence

5

EMD submission proof (as per tender terms)

6

Technical bid documents demonstrating IS 1180 compliance

7

OEM authorization certificates (where applicable)

8

Warranty certificates from OEM

Frequently Asked Questions

Key insights about WEST BENGAL tender market

How to bid for the West Bengal distribution transformer tender in 2026?

Bidders must submit GST, PAN, and experience certificates along with technical and financial bids. Ensure IS 1180 conformity, 2-year OEM warranty, and evidence of a service center in West Bengal or plans to establish within 30 days. EMD amount should follow tender guidelines and be paid as defined in the terms.

What documents are required for the 11 kV transformer tender in WB?

Required documents include GST registration, PAN, experience certificates for similar supply, financial statements, EMD proof, OEM authorizations if applicable, IS 1180 test reports, and warranty certificates from the OEM. Technical bid must demonstrate compliance with energy efficiency and BEE star rating.

What standards and tests are mandatory for the transformer bid?

Mandatory standards include IS 1180 Part 1:2014 (Annex-D) for impulse withstand and paint adhesion, stage inspections, type test reports, sound level, BDV/oil moisture, and no-load current at 112.5% voltage. Transformers must meet energy efficiency and BEE star rating criteria.

What is the warranty requirement for the transformer procurement in WB?

Warranty duration is 2 years from final acceptance or after installation/commissioning. OEM warranty certificates must be submitted at delivery; service support and maintenance teams should be available across India for after-sales service.

What is the delivery and quantity variation clause for this tender?

The purchaser can increase or decrease quantity up to 25% at contract placement or during currency. Delivery period adjusts based on a formula; minimum extension is 30 days. Successful bidders must adhere to this option clause.

Where will service centres be required for the transformer supply?

Bidder must have a functional service centre in the state of each consignee location or establish one within 30 days of award. Payment is released after documentary evidence of a functional service centre is provided.

What installation and training are included in the scope of supply?

Scope includes supply, installation, testing, commissioning, and training of operators. Statutory clearances, if any, must be provided; training ensures operators can run and maintain the transformer efficiently post-commissioning.

What are the key rating and voltage specifications for the transformer?

Transformers rated up to 2500 kVA with 11 kV nominal HV and corresponding LV voltage in volts; insulation level, no-load current test, and highest system voltage are clearly defined per IS 1180 standards; bushings and end boxes must suit voltage and current ratings.

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