ETS Group
    UHV Power Transformers — view 1 of 8
    Ultra High Voltage
    500MVA
    Max Capacity
    765kV
    Voltage Class
    99.7%
    Efficiency
    40yr
    Design Life
    Ultra High Voltage · 400–765 kV

    UHV Power Transformers

    Ultra high voltage power transformers for the highest transmission-class applications. 200–500 MVA, 400–765 kV — leveraging global JV partnerships including Skipper ETS India for world-class UHV capability.

    IEC 60076
    IEEE C57
    ISO 9001
    ISO 14001
    Capacity Range
    200 – 500 MVA
    Voltage Class
    400 – 765 kV
    Cooling Methods
    ONAF / ODAF / OFAF / ODWF
    Standards
    IEC 60076 / IEEE C57
    Insulation
    Oil Immersed (Mineral / Ester)
    Core Design
    Step-Lap Mitre Grain-Oriented
    Installation Support available on request
    Support from an ETS engineer during installation and commissioning, available on request.
    Type Tested
    Warranty
    Global

    Engineering Features

    Short-Circuit Testing

    Independently witnessed short-circuit withstand testing — essential for UHV-class fault currents.

    Technical Data

    ParameterRange / Value
    Rated Power200 – 500 MVA
    Primary Voltage400 – 765 kV
    Secondary Voltage11 – 36 kV
    Frequency50 / 60 Hz
    Impedance12% – 18% (customizable)
    Vector GroupAs per specification
    Noise Level≤ 80 dB(A) at 1m
    Total LossesPer IEC/IEEE guaranteed values
    Temperature RiseTop oil ≤ 55K, Winding ≤ 60K
    Insulation LevelFull BIL / SIL as per UHV class

    Standard range parameters — custom specifications available on request.

    Related glossary terms

    electricalMVA (Megavolt-Ampere)Unit of apparent power equal to 1,000 kVA or 1,000,000 VA. Used to rate power transformers.electricalBIL (Basic Insulation Level)The reference impulse insulation withstand voltage that defines the transformer's ability to survive lightning and switching surges.testingPartial Discharge (PD)Localised electrical discharge that does not fully bridge the insulation between conductors. A precursor to insulation failure.testingTan Delta (Dissipation Factor)Measure of dielectric losses in insulation. A high tan delta value indicates deteriorated insulation.standardsIEEE C57North American standard series for power and distribution transformers. The counterpart to IEC 60076 for ANSI/IEEE markets.
    UK Compliance & Trust Signals

    ENATS 35-1

    DNO-approved distribution transformer specification

    ENATS 35-2

    UK secondary substation transformer standard

    G99 Compliant

    Engineering Recommendation G99 grid interface

    BS EN 60076

    British Standard for power transformers

    EcoDesign Tier 2

    EU 548/2014 efficiency compliance

    Regional Overview

    Ultra High Voltage power transformers for the UK transmission system and HVDC interconnections. 200 MVA to 500 MVA at 400 kV and 525 kV, leveraging our JV with Skipper ETS India for world-class UHV manufacturing capability. Designed to BS EN 60076 / IEC 60076 with short-circuit certification, our UHV portfolio supports offshore-wind HVDC converter stations and the UK's interconnector projects (IFA2, NeuConnect, Viking Link).

    Applications

    Where UHV Power Transformers Excel.

    01
    01

    UK 400 kV Super-Grid

    BS EN 60076 UHV transformers for National Grid 400 kV super-grid reinforcement and the Great Grid Upgrade programme.

    02
    02

    HVDC Interconnector Substations

    UHV-class transformers for North Sea Link, Viking Link and future UK-Europe HVDC interconnector AC substations.

    03
    03

    Strategic UK Generation

    Generator step-up transformers for Hinkley Point C, Sizewell C and other strategic UK generation projects.

    04
    04

    UK Offshore Wind Bulk Transmission

    Bulk-power UHV transformers for Dogger Bank, Hornsea and other UK offshore wind onshore connection points.

    FAQ

    Frequently Asked Questions

    Deployed in

    Saudi ArabiaNEOM

    Related Knowledge

    FAQs, glossary terms and sizing steps mapped to this product.

    FAQ
    Glossary
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