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Power Transformers

Home > HV/MV Equipment > Transformers > Power Transformers

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Power Transformers

Low maintenance, high performance, digital and environmental-friendly designs

GE’s comprehensive suite of power transformers support a wide range of voltage levels with applications in generation, transmission and distribution. GE offers a wide variety of power transformers from medium to ultra-high voltage (1200 kV AC and ±1100 kV DC) and from small (5 MVA) to very large power ratings (2750 MVA).

Our product lines include conventional, special transmission such as phase-shifting, SVC, HVDC, low maintenance and reactors, as well as green power transformers. GE’s power transformers provide exceptional performance, quality and reliability with digitized protection and monitoring schemes and advanced design and testing capabilities.

For specific North America offering click here

GE Advantage
Conventional Power Transformers
Special Power Transformers
Green Transformers
Power Transformers interactive app


  • Continuous & intelligent bushing monitoring
  • Online gas analysis of up to 7 fault gases plus oxygen & moisture
  • Constant temperature monitoring for winding hot spots
  • Fast tripping with unrestrained differential element


  • Design verified with sophisticated validation & analysis software
  • High short circuit withstand
  • Wide range of options for HV/MV bushings


  • High efficiency cooling system with speed controllable fans
  • Minimizing losses & noise level
  • Leakage flux control reduce stray losses & hot spots


  • Extensive testing capabilities with in-house developed design rules & software
  • Strong contribution to industry & standardization organizations (i.e: CIGRE & IEEE)
  • State-of-the-art software & design analysis tools

Conventional Power Transformers

Power Transformer

GE’s large, medium and small power transformers include equipment and solutions tailored to meet global customer’s needs. GE utilizes the latest in design, measurement and testing tools to ensure each transformer meets and exceeds the latest industry standards, as well as operational and customer specifications. Our design software includes sophisticated, in-house scientific calculation tools to perform advanced transformer analytics.

The power transformer design optimization, verification and analytical software supports consistent fulfillment of all specified requirements and efficiencies greater than required by 2020 EC Energy Directive, EN 50629 and EN 50588-1. Examples of high efficiency are found in optimized transformer cooling, low air forced cooler noise, advanced core design techniques that reduce no-load loss and no-load noise, and accurate design verification tools.

Key benefits

  • Large power transformers up to 1200 kV AC and power ratings up to 1000 MVA
  • Small and medium power transformers up to 245 kV and 120 MVA
  • The design and rating of tertiary windings and coupling arrangements are adapted to customer’s requirements
  • Autotransformers up to 1200 MVA and voltages up to 765 kV Learn more
  • Generator step-up transformers up to 1000 MVA Learn more


GE’s Autotransformers

Compared with interconnection transformers of equivalent power flow, the autotransformer presents a lighter and more economically optimized solution which is possible whenever the voltage ratio is between 1 and 2. However, autotransformers have non-disconnected windings, meaning there is no galvanic insulation between the interconnected systems.

Characteristically for complex regulation arrangements, autotransformers impose a total mastership of dielectric phenomena. Designs for constant flux regulation at high voltages or booster schemes are part of GE’s mastery. For many years, GE been supplying very high rated autotransformers such as single phase up to 500 MVA and very high voltage up to 765 kV for networks all over the world.

Key features:

  • Available up to 765 kV
  • Designed for constant flux regulation at high voltages and booster schemes
  • Advantages include compact footprint, lighter weight and lower losses

Generator Step up Transformers

GE’s generator step up GSU transformers

GE’s generator step-up (GSU) transformers are designed and manufactured to stringent standards, providing superior performance and long life. They are suitable for nuclear, thermal and hydraulic applications from small to high voltages with power ratings from 5 MVA to 1000 MVA. The step-up transformers have delta-connected LV windings energized by the generator voltage, while star connected HV windings are connected to the transmission lines.

Constantly faced with voltage changes either due to load rejection or switching operations, followed by generator over excitation, the transformer must also maintain the ability to withstand over-loads. The high rated current involved requires absolute control of the magnetic field inside the tank to avoid localized overheating of associated metallic parts. All of these situations are taken into account by GE during the design process of individual units and are tested with state-of-the-art techniques.

Thanks to our specific know-how coupled with state-of-the-art modeling and design tools, GE is able to provide solutions that meet unique power requirements with every installation.

Special Power Transformers

Prolec GE taps into state-of-the-art technology and deep domain expertise in insulation structures, thermal requirements and magnetic field distribution applications, to provide power transformers with exceptional performance, quality and reliability.

Phase-shifting Transformers


As high voltage network systems are connected with each other at several points, the necessity of controlling the flow of energy increases. Classical voltage regulation without phase shifting is no longer sufficient for these situations. GE’s phase-shifting transformers, rated up to 2750 MVA, are available as single core units with independent phase angle and voltage regulation, and as dual core for higher power and voltages. Quadrature boosters provide an economical solution when limited phase-shifting angles are required with voltage variations.

Transformers For SVC


GE’s Static Var Compensator (SVC) systems can help grid operators to gain accurate control of reactive network power, maximize power transfer capability, improve steady-state and dynamic stability within the grid. GE’s SVC power transformers are custom designed and built to handle harmonic loading and a wide voltage variation. These can be configured as three phase units or a bank of single phase units. The function of the power transformers is to connect the medium voltage equipment to the high voltage transmission grid.

Industrial Transformers


GE’s industrial specialized transformers portfolio includes a wide range of rectifier transformers for the electrolysis process of metal or chemical industries, as well as AC or DC Electrical Arc Furnace (EAF) transformers. With expertise in products up to the highest ratings in the world, GE’s references include rectifier transformer combinations above 80 kA DC current ratings and EAF transformers up to 300 MVA.

Low Maintenance Transformers


Hermetically sealed power transformers without oil conservator are GE’s field-proven answer to today’s needs. Thanks to the innovative design of the radiators, the oil expansion vessel is not needed and thus the oil is prevented from coming into contact with ambient humidity. Service life is also increased with the use of a vacuum-switch on-load tap-changer (OLTC) that eliminates contact erosion. With minimal oil and OLTC aging rate, the Hermetik does not require any particular maintenance or work over its service life, speeding up the return on your investment.

Oil-immersed Reactors


GE’s environmental-friendly, long-life, maintenance-free reactors enhance system performance and power quality from transmission and distribution to industrials, improving network operational efficiency. This results in considerable savings for customers and reduces the environmental impact of their operations.

HVDC Converter Transformers


GE offers a wide range of dedicated High Voltage Direct Current (HVDC) systems that enable efficient and reliable transmission of energy over long distances and interconnect networks with different characteristics and frequencies. GE is an expert in the design and manufacture of HVDC converter transformers with sophisticated insulation and thermal structure. Ratings include 500 MVA and voltage levels up to 800 kV.

Green Transformers

Green Power Transformer

GE has developed a wide offering of green solutions for power transformers ranging from 10 to 500 MVA and ratings up to 550 kV. Our environmentally-friendly solutions are aimed at meeting the major energy challenges of today and tomorrow: energy efficiency, market efficiency, grid reliability, enhanced overload capability, low loss, low noise and environmental concerns.

GE’s green power transformers offer significant environmental benefits, including better product performance, across the phases of the product life cycle:

  • Reduced consumption of natural resources during manufacturing
  • Lower CO2 emissions, limitation of environmental risk, noise reduction, space savings and energy efficiency during operation
  • Recycling capabilities of products at the end of their life

Key benefits

  • Range of green eco-efficient power transformers, from 10 to 500 MVA and up to 550 kV
  • Prevention of pollution and increased safety by using natural ester insulation liquid
  • Innovative technologies to reduce acoustic energy transferred and optimized design of the active part
  • Optimized low loss levels
  • Innovative technology to reduce noise level
  • Reduced maintenance cost, extended life time and increased overload with hermetically-sealed tank design, equipped with patented expandable radiators and vacuum type tap changer
  • On-line condition monitoring system
  • State-of-the-art factories around the world
VG-100 Fluid – Vegetable Oil for Electrical Transformers

VG-100 Fluid – Vegetable Oil for Electrical Transformers

VG-100® is a biodegradable dielectric fluid developed by Prolec GE, with patents granted for its application in electrical transformers. VG-100 has been satisfactorily used in more than 500 units since its introduction in 2009, and is an excellent alternative to mineral oil for use in new transformers and retrofill applications.
View the brochure.

Manufacturing Excellence

GE manufacturing plants are highly automated digital factories that use the GE Predix platform for machine learning and modeling.

Itajubá Brazil plant photo

Itajubá, Brazil
Our Itajubá factory supplies a broad range of engineered equipment for all segments and commercial regions, by means of state-of-the-art machinery and design criteria, first class raw material, strict production and quality controls, and very experienced staff.

Products manufactured in Itajubá, Brazil:

  • Air-core dry-type reactors
  • High voltage capacitor units and banks
  • High voltage harmonic filters
  • AIS products (instrument transformers, circuit breakers, disconnectors and line traps)
Tampere Finland plant photo

Tampere, Finland
Our factory in Tampere was built in 1983 and is home to the Nokian capacitors brand. Tampere has more than 30 years factory-based experience making high and low voltage capacitors and air core reactors. In 2005, a new reactor factory was added to provide components and complete solutions for all PFC and filtering problems. Tampere has further improved its processes with recently renewed IT systems. Our Tampere factory is ISO 9001, ISO 14001 and OHSAS 18001 certified.

Products manufactured in Tampere, Finland:

  • High voltage capacitor units and banks
  • Low voltage capacitor units and banks
  • Air core reactors


For more than 50 years, GE has provided global support and advanced technologies to +1,000 customers in 80 countries, offering a broad range of reactors for many market segments. GE is an industry leader in design and manufacturing process with compliance in international technical and certification standards. Below are a select representation of our projects, a complete reference list is available upon request.

References map

1. Canada (2016)
HVDC Smoothing Reactors
AC/DC Filter Reactors

5. Peru & Colombia (2012-2018)
Current Limiting Reactors
Neutral Grounding Reactors
Damping & Filter Reactors

9. Scotland (2002)

13. South Korea (2014)
HVDC Smoothing Reactors

2. USA (1995-2018)
Shunt Reactors
Current Limiting Reactors
Neutral Grounding Reactors
Damping & Filter Reactors

6. Chile (2010-2017)
Current Limiting Reactors
Neutral Grounding Reactors
Damping & Filter Reactors

10. France, Germany and Netherlands (2002-2018)
Damping & Filter Reactors
Neutral Grounding Reactors

14. Thailand (2006-2018)
Damping & Filter Reactors

3. Mexico (2000-201)
Current Limiting Reactors
Damping & Filter Reactors

7. Uruguay (2010)

11 Turkey (2008)

15. Malaysia (2002-2018)
Damping & Filter Reactors

4. Brazil (2012)
Rio Madeira HVDC

8. Brazil (1976-2018)
Current Limiting Reactors
Neutral Grounding Reactors
Damping & Filter Reactors
Arc-Furnace Reactors
Laboratory Reactors

12. South Africa (1998-2018)
Current Limiting Reactors
Damping & Filter Reactors

16. Australia (2010-2018)
Shunt Reactors
Damping & Filter Reactors