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Tamil Nadu TANGEDCO Distribution Transformer Tender 3 Phase 11 kV 200-2500 kVA 2026

Bid Publish Date

05-Jan-2026, 10:55 am

Bid End Date

15-Jan-2026, 3:00 pm

EMD

₹10,000

Location

TIRUNELVELI , TAMIL NADU

Progress

Issue05-Jan-2026, 10:55 am
AwardPending
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Quantity

1

Bid Type

Single Packet Bid

Categories 8

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

Tender Overview

TANGEDCO (Tamil Nadu Generation and Distribution Corporation Limited) seeks supply of 3-Phase Distribution Transformers covering a rated range from 200 kVA up to 2500 kVA at nominal system voltage 11 kV (HV) and corresponding LV levels, for deployment under Tamil Nadu electricity distribution projects. The procurement includes transformer construction per IS 1180 guidelines, with emphasis on energy efficiency levels, BEE star rating, and installation, testing, and demonstration requirements. EMD: ₹10,000. The awardable quantity is subject to a 25% opt‑in/variation, and delivery timing will align to order issuance and extended periods per option clauses. This tender targets suppliers capable of meeting rigorous safety, performance, and environmental standards across Tamil Nadu.

Technical Specifications & Requirements

  • Standards & Certifications: IS 1180 (Part 1) 2014; BEE star rating; energy efficiency level; paint adhesion and BDV/moisture tests; stage inspection as required.
  • Ratings & Electrical: Standard ratings (kVA), Nominal HV/LV voltages, No-load current at 112.5% voltage, Highest system voltage (kV), Lightning impulse withstand (kV peak); cooling and insulation levels per IS norms.
  • Construction & Materials: Core material, winding conductor material, transformer tank material and thickness (top/bottom/side), gaskets, conservator provision; bushings on HV/LV with appropriate rating; cable end boxes; bolts/nuts/ware components suitable for atmosphere; painting per IS:1180 guidance.
  • Optional Fittings & Tests: Lightning arrestors, Bird guard, winding temperature oil indicators, Buchholz relay, oil level gauge, drain valve, protection relays for sealed types, sound level tests, short-circuit withstand, BDV/oil moisture testing.
  • Delivery & Documentation: Type test reports, approved stage inspections, and conformity proof; maximum altitude limits; warranty periods post-receipt and post-installation.

Terms, Conditions & Eligibility

  • EMD: ₹10,000 (via online payment or demand draft as specified).
  • Delivery Window: From order date with option-enabled quantity adjustments up to ±25%; minimum extension rules described in option clause.
  • Warranty: Minimum warranty on receipt and from installation; exact months not stated, but must meet IS 1180 references.
  • Documentation: GST, PAN, experience certificates, financial statements, OEM authorizations, and technical bid documents; stage/test reports must be provided.
  • Payment Terms: Standard practice to be confirmed; ensure compliance with buyer ATC terms.
  • Eligibility: Experience in supplying high‑voltage transformers, capability to perform required tests, and availability of type test reports.
  • Penalties: LD/penalty provisions to be as per buyer ATC; ensure compliance with delivery schedule and performance clarity.

Key Specifications

  • Distribution transformer category: 3 phase, 11 kV to LV

  • Rated capacity: 200 kVA to 2500 kVA (inclusive)

  • Standards: IS 1180 (Part 1): 2014; BEE star rating; energy efficiency level

  • Paint specification: internal and external coatings per Table 12 IS:1180 Pt.1:2014

  • Voltage withstand: highest system voltage, no-load current at 112.5% voltage

  • Tank construction: material, thickness min top/bottom and side; gaskets; conservator provision

  • Optional fittings: Buchholz relay, oil temp indicators, Bird guard, lightning arrests, protection relays

  • Testing: type test reports required; sound level, short-circuit withstand, BDV/oil moisture tests

Terms & Conditions

  • Option clause allows ±25% quantity variation during contract and currency

  • Delivery period aligns to last date of original order; extension rules given

  • EMD of ₹10,000; stage inspections and type tests required

Important Clauses

Payment Terms

Payment terms to be as per buyer ATC; EMD ₹10,000, with possible advance or milestone payments per contract

Delivery Schedule

Delivery must commence from order date; option quantity adjustments allowed up to ±25% with minimum 30 days extension if applicable

Penalties/Liquidated Damages

Penalties to be defined per ATC; LDs for late delivery and non-conformance to standards

Bidder Eligibility

  • Experience in supplying high voltage distribution transformers (200 kVA to 2500 kVA)

  • Demonstrated capability to meet IS 1180 and BEE star rating requirements

  • Availability of type test reports and stage inspection readiness

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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
STANDARDS Minimum warranty on receipt of stores (in Months) 66
STANDARDS Minimum warranty from the date of installation (in Months) 60
RATINGS Nominal system voltage, HV ( in kV) 11
RATINGS Nominal system voltage, LV ( in V) 415
RATINGS Standard ratings (in kVA) 250
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 Ground Mounted
CONSTRUCTION Noise level at rated voltage and freqeuncy, Maximum (in dB) 48
TRANSFORMER TANK Transformer tank cover construction Sealed
TRANSFORMER TANK Tank configuration with Cooliong tubes
TRANSFORMER TANK Material of transformer tank Stainless steel
TRANSFORMER TANK Minimum thickness of top and bottom material of transformer tank (in mm) 7
TRANSFORMER TANK Minimum thickness of side material of transformer tank (in mm) 5
TRANSFORMER TANK Material of Bolts/Nuts/Wahers exposed to atmosphere Stainless steel (for upto 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 No
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)
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
TERMINAL ARRANGEMENT Cable End Box on LV side Yes
MARKING Material of rating plate Stainless steel
MARKING Marking method on rating plate Stamped
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 Yes
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 Yes
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
OPTIONAL FITTINGS Expulsion fuse as disconnection device No
SERVICE CONDITION Maximum altitude <1000 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 Yes
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 Yes for 1 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

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Required Documents

1

GST registration certificate

2

Permanent Account Number (PAN) card

3

Experience certificates for similar transformer supply

4

Financial statements (audited if available)

5

EMD submission proof

6

Technical bid document demonstrating IS 1180 compliance

7

OEM authorization letters (if applicable)

8

Type test reports and any stage inspection approvals

Frequently Asked Questions

Key insights about TAMIL NADU tender market

How to bid for Tamil Nadu TANGEDCO transformer tender 2026?

To bid, prepare GST and PAN, provide experience certificates for HV transformer supply, attach EMD ₹10,000, and include type test reports; ensure IS 1180 compliance, BEE star rating, and stage inspection readiness; submit OEM authorizations if applicable and financial statements.

What documents are required for transformer tender in Tamil Nadu?

Required documents include GST certificate, PAN, experience certificates for HV transformer supply, financial statements, EMD proof of ₹10,000, OEM authorization letters, and IS 1180-compliant technical bid with stage/test reports and painting specifications per Table 12.

What are the key standards for 11 kV distribution transformers in this bid?

Key standards include IS 1180 (Part 1): 2014, mandatory stage inspections, BDV and moisture tests, paint adhesion tests, and energy efficiency levels with BEE star rating to be demonstrated by the supplier.

What is the EMD amount and its submission method for this procurement?

EMD is ₹10,000; bidders must submit proof of payment or online transfer as part of bid security, with reference in the bid submission and eligibility validation.

What is the delivery quantity flexibility for this transformer tender?

The buyer reserves an option to increase or decrease quantity by up to 25% during contract; extended delivery periods follow the formula (additional quantity/original quantity) × original delivery period with a minimum of 30 days.

What testing reports are mandatory for submission in this tender?

Mandatory testing reports include type test certificates, short-circuit withstand test, sound level test, BDV/oil moisture tests, paint adhesion, and confirmation of conformity to IS 1180 specifications; stage inspection may be required by buyer.

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