ETS Group
    Generator Step-Up (GSU) Transformers — view 1 of 1
    Power Plant to Grid
    200MVA
    Max Capacity
    132kV
    Voltage Class
    99.5%
    Efficiency
    40yr
    Design Life
    Power Plant to Grid · 10–200 MVA · Up to 132 kV

    Generator Step-Up (GSU) Transformers

    Generator step-up transformers purpose-built for power plants — connecting generators to the transmission grid at elevated voltage. Optimized for continuous full-load operation with low losses, high reliability, and enhanced short-circuit withstand.

    IEC 60076
    IEEE C57.12
    IEEE C57.116
    ISO 9001
    ISO 14001
    Capacity Range
    10 – 200 MVA
    Voltage Class
    Up to 132 kV
    Cooling
    ONAN / ONAF / OFAF
    Standards
    IEC 60076 / IEEE C57
    Tap Changer
    OLTC, ±10% in 17 steps
    Vector Group
    YNd1 / YNd11
    Installation Support available on request
    Support from an ETS engineer during installation and commissioning, available on request.
    Type Tested
    Warranty
    Global

    Engineering Features

    Continuous Full-Load Rated

    Designed for 100% continuous duty at nameplate rating — no derating required for base-load generator operation.

    Technical Data

    ParameterRange / Value
    Rated Power10 – 200 MVA
    Voltage RatioUp to 132 kV / 6.6–22 kV
    Frequency50 / 60 Hz
    Vector GroupYNd1 / YNd11
    Impedance12% – 18%
    CoolingONAN / ONAF / OFAF
    Tap ChangerOLTC ±10% / 17 steps
    Temperature RiseTop oil ≤ 55K, Winding ≤ 60K
    StandardsIEC 60076 / IEEE C57.116
    Design LifeLong-service design

    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.electricalImpedance (%Z)The percentage of rated voltage required to circulate full-load current through the transformer with the secondary short-circuited. A critical parameter for fault current calculations.electricalBIL (Basic Insulation Level)The reference impulse insulation withstand voltage that defines the transformer's ability to survive lightning and switching surges.mechanicalOLTC (On-Load Tap Changer)Mechanical device that adjusts the transformer's turns ratio while energised and under load, allowing voltage regulation without interrupting supply.standardsIEEE C57North American standard series for power and distribution transformers. The counterpart to IEC 60076 for ANSI/IEEE markets.
    US Compliance & Trust Signals

    IEEE C57.12

    ANSI/IEEE distribution transformer standard

    ANSI C57.12.00

    General requirements liquid-immersed

    DOE 2016

    US Department of Energy efficiency rule

    NEMA TR1

    Sound level & loss tolerances

    UL Listed

    Underwriters Laboratories safety mark

    IEEE C57.110

    Harmonic-loaded transformer rating

    Regional Overview

    Generator step-up (GSU) transformers for North American power generation. 10 MVA to 500 MVA up to 765 kV — IEEE C57.12.00 designed, short-circuit certified and seismic-qualified. Trusted by Independent Power Producers, IOUs and NRECA G&T co-operatives for thermal CCGT plants, gigawatt-scale solar and wind, hydro upgrades and gas-peaker fleets across ERCOT, PJM, MISO, CAISO and SPP territories.

    Applications

    Where Generator Step-Up (GSU) Transformers Excel.

    01
    01

    Gas Turbine Power Plants

    Step-up duty for simple-cycle and combined-cycle gas turbine generation.

    02
    02

    Steam Turbine Generation

    Coal, biomass, and nuclear steam-turbine generator interconnection.

    03
    03

    Combined Cycle Plants

    Optimized for CCGT auxiliaries and main generator step-up duty.

    04
    04

    Co-Generation Facilities

    Industrial CHP plants exporting surplus power to the utility grid.

    FAQ

    Frequently Asked Questions

    Deployed in

    Saudi ArabiaNEOMQatarDoha

    Related Knowledge

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

    Sizing Guide
    Glossary
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