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West Bengal Transport Corporation Limited Distribution Transformer Tender Kolkata 11 kV 200-2500 kVA IS 1180 2014 2025

Bid Publish Date

25-Dec-2025, 8:57 pm

Bid End Date

15-Jan-2026, 9:00 pm

EMD

₹1,00,000

Location

KOLKATA , WEST BENGAL

Progress

Issue25-Dec-2025, 8:57 pm
Corrigendum05-Jan-2026
AwardPending
Explore all 4 tabs to view complete tender details

Quantity

1

Bid Type

Two Packet Bid

Key Highlights

  • • Brand/OEM requirements: mandatory OEM warranty and service center presence in West Bengal
  • • Technical standards: IS 1180 (Part 1):2014, IS 550/BEE energy efficiency, BEE Star Rating
  • • Special clauses: option to increase/decrease quantity up to 25% during contract; extended delivery timelines
  • • Eligibility: bidders must provide type test reports, sound level and short-circuit tests; 2-year warranty
  • • Warranty/AMC: 2-year OEM warranty; dedicated service engineers; service center within 30 days if not existing
  • • Penalties/LD: details not explicitly listed; ensure adherence to delivery and performance conditions

Categories 8

HIGH VOLTAGE DISTRIBUTION SYSTEM DIRECT TRANSFORMER DISTRIBUTION TRANSFORMER ELECTRICAL SUBSTATION STATIC CONVERTERS TRANSFORMER SUPPLY ELECTRICAL DISTRIBUTION SYSTEM SUB STATION

Tender Overview

West Bengal Transport Corporation Limited invites bids for the supply, installation, testing and commissioning of 3-phase distribution transformers 11 kV (HV) to 0.415 kV LV, 200 kVA up to 2500 kVA at Kolkata 700001. The tender requires EMD ₹1,00,000 and encompasses delivery, on-site installation, testing, commissioning and operator training. Technical emphasis lies on energy efficiency, BEE Star ratings, standard testing and conformity to IS 1180 (Part 1):2014, with optional fittings and sound-level considerations. Unique aspects include stage inspections, transformer tank construction and comprehensive testing reports. This procurement targets compliant OEMs with a proven service footprint in West Bengal and a robust after-sales network.

Technical Specifications & Requirements

  • Standards: energy efficiency level, BEE Star Rating, IS 1180 (Part 1):2014 Annex-D for sound tests, stage inspection requirements
  • Ratings & Basic data: Nominal HV 11 kV, LV 0.415 kV, standard ratings in kVA, highest system voltage, lightning impulse withstand (kV Peak), no-load current at 112.5% voltage
  • Construction: transformer tank material, core and winding conductors, min. tank thickness (top/bottom and sides), painting type per IS 1180 Table 12
  • Accessories (optional): Buchholz relay, oil temp/ winding temp indicators, surge arrestors, gland/panels, cable end boxes, jacking pads, Marking plates
  • Testing & Certification: type test reports available, stage inspection, sound level, short-circuit withstand, BDV/moisture content, painting adhesion
  • Installation requirements: provision for cables on LV side, bushings on HV/LV sides, rating plate with combined terminals
  • Warranty & service: minimum warranty on receipt and installation date, 2-year OEM warranty, dedicated service centers in West Bengal, escalation contact details

Terms, Conditions & Eligibility

  • EMD: ₹1,00,000
  • Delivery & scope: supply, installation, testing and commissioning plus operator training; statutory clearances if any
  • Warranty: 2 years from final acceptance or after installation; OEM warranty certificates required at delivery; service center within 30 days of award
  • Service commitments: dedicated support number and escalation matrix; post-warranty service access in-state; installation/training support
  • Option clause: quantity adjustment up to ±25%; delivery extends accordingly with minimum 30 days extra if applicable
  • Documents: GST, PAN, experience certificates, financials, EMD submission proof, OEM authorization for transformers; stage inspection/test reports

Key Specifications

  • Transformer rating range from 200 kVA to 2500 kVA

  • HV nominal voltage: 11 kV; LV nominal voltage: 0.415 kV

  • Highest system voltage and no-load current specs to be as per IS 1180 and Annex-D

  • Tank material and minimum wall thickness for top, bottom and sides as per IS 1180

  • Painting requirements per Table 12 of IS 1180 (Pt.1):2014

  • Optional fittings: Buchholz relay, oil temp/winding temp indicators, lightning arrestors

Terms & Conditions

  • EMD ₹1,00,000; bid validity and delivery terms aligned with buyer options

  • 2-year OEM warranty with service center in West Bengal; mandatory certificates

  • Quantity flexibility up to ±25% with extended delivery period; installation included

Important Clauses

Payment Terms

Payment to be linked to delivery milestones; ensure GST compliance and documentary evidence

Delivery Schedule

Delivery starts after order; option to extend duration with 30 days minimum if quantity scaled

Penalties/Liquidated Damages

LD terms not detailed; ensure adherence to delivery and performance benchmarks per contract

Bidder Eligibility

  • Proven track record in supply and installation of distribution transformers (200 kVA–2500 kVA)

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

  • Compliance with IS 1180 (Pt.1):2014 and energy efficiency/BEE rating requirements

Past Similar Tenders (Historical Results)

5 found

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Closed: 4 August 2025
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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 Yes . Including Civil work, Yes . Excluding Civil work, 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) 1000
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, Ground 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 Yes, 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 On secondary side (as per IS/IEC:60947-2:2003, No
OPTIONAL FITTINGS Expulsion fuse as disconnection device On Primay side (as per IS:9385 (Part 2):1980, 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

Permanent Account Number (PAN) card

3

Experience certificates for similar transformer supply/installations

4

Financial statements or turnover proof for last 3 years

5

EMD payment receipt or bank guarantee document

6

Technical bid documents showing conformity to IS 1180 (Part 1):2014

7

OEM authorization letter (if bidder is not the OEM)

8

Type test reports and compliance certificates for energy efficiency and BEE rating

9

Warranty certificates and service center details in West Bengal

Corrigendum Updates

2 Updates
#1

Update

05-Jan-2026
#2

Update

25-Dec-2025

Frequently Asked Questions

Key insights about WEST BENGAL tender market

How to bid for distribution transformers tender in Kolkata 2025?

Bidders must submit GST, PAN, experience certificates, financials, EMD ₹1,00,000, OEM authorization if required, and type test reports demonstrating IS 1180 (Pt.1):2014 compliance, plus stage inspection readiness and BEE rating data.

What documents are required for transformer tender in West Bengal?

Required documents include GST certificate, PAN, experience certificates for similar work, financial statements, EMD proof, OEM authorization, type test reports, warranty certificates, and service center details in West Bengal.

What are the technical specifications for the 11 kV distribution transformers?

Specifications cover HV 11 kV, LV 0.415 kV, standard megavolt-ampere rating range 200–2500 kVA, insulation levels, no-load current at 112.5% voltage, and compliance with IS 1180 (Pt.1):2014 Annex-D sound tests.

What is the warranty period for supplied transformers in this bid?

An OEM warranty of 2 years from final acceptance or installation completion is required, with supplier providing warranty certificates at delivery and establishing local service support in West Bengal.

What are the delivery and acceptance conditions for the Kolkata tender?

Delivery scope includes supply, installation, testing and commissioning, plus operator training; delivery can be adjusted by ±25% quantity with minimum 30 extra days; stage inspections and testing reports are mandatory.

How is service support organized for this transformer procurement?

Bidder must have a dedicated service center in/state or establish one within 30 days of award; provide toll-free service support and an escalation matrix for service issues.

What standards must transformers meet for energy efficiency and safety?

Transformers must meet energy efficiency levels, BEE Star Rating, IS 1180 (Pt.1):2014 standards, and provide BDV/oil moisture data plus paint adhesion and short-circuit test reports.

What is the EMD amount and acceptable payment terms?

EMD is ₹1,00,000; payment terms align to delivery milestones and compliance with GST requirements, with documentation proving delivery and performance milestones for release.