Sensformer: Transformers meet connectivity

Sensformer: Born connected.

Are you ready to move into the age of connective assets? With the Sensformer, a transformer that is equipped with a connectivity feature, you can utilize the data your transformer provides to dive into digitalization and optimize your operations and business decisions.   Discover the Sensformer and all the benefits   Find out more about our transformers. Our iPDF takes you on a journey through the fascinating world of Siemens Transformers: Download it below to find out how we equip powerhouses in urban neighborhoods and enable the energy superhighways of the future and learn how our assets play a decisive role in the digital revolution!

Can transformers only transform energy? Find out in our iPDF.

Download now

Power Transformers

Power Transformers

  • Rated power: from ≤ 100 MVA to > 400 MVA
  • Application areas: power generation, power transmission, industry, infrastructure
  • Features: available in special low noise version, designed to be highly efficient with “green” transformer options

Power Transformers



  • Rated power: from ≤ 10 MVA to > 400 MVA
  • Application area: power transmission
  • Features: available in special low noise version, designed to be highly efficient with “green” transformer options


Transformers for Industrial Applications

Transformers for Industrial Applications

  • Rated power: from ≤ 10 MVA to > 400 MVA
  • Application area: industry

High-Current Industrial Transformers

Phase Shifting Transformers

Phase Shifting Transformers

  • Rated power: from ≤ 10 MVA to > 400 MVA
  • Application area: power transmission, industry
  • Features: available in special low noise version, designed to be highly efficient with “green” transformer options

Phase-Shifting Transformers

HVDC Transformers

HVDC Transformers

  • Rated power: from ≤ 10 MVA to > 400 MVA
  • Application area: power transmission
  • Features: available in special low noise version, designed to be highly efficient with “green” transformer options

HVDC Transformers

Distribution Transformers

Distribution Transformers

  • Rated power: from 5 kVA bis ≤ 30 MVA
  • Application areas: distribution MV, industry, infrastructure
  • Features: designed to be highly efficient with “green” transformer options

GEAFOL Cast-Resin Transformers

Fluid-immersed Distribution Transformers

Fluid-immersed Distribution Transformers

Voltage Regulators

Traction Transformers

Traction Transformers – Tractronic®

  • Rated power: ≤ 10 MVA
  • Application area: mobility

Traction Transformers

Success Story, August 2019

Successful short-circuit test of one of the world’s largest autotransformer

One of the world’s largest short-circuit tested autotransformer on its journey from China to the Netherlands and back.

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A key role in electricity supply

Current highlights

Direct-current electricity can now be transmitted at gigantic 1,100 kilovolts

The world´s first transformer, which has been designed and manufactured for the HVDC transmission line with the highest direct-current electricity of ± 1,100 kilovolt (kV) has been tested successfully in Nuremberg, Germany. The transformer will enable low-loss and extremely efficient high-voltage direct-current (HVDC) power transmission over a record distance of 3,284 kilometers with a transmission capacity of twelve gigawatts.


Excited? You can watch the journey of Siemens’ first 1,100 kV HVDC transformer 

Part 1: The first 1100 kV HVDC transformer

Part 2: The departure

Part 3: The arrival at the port of Shanghai

Part 4: Delivery to to Guquan converter station

Find out how our innovations are shaping the future of transformers

There’s so much more to a transformer than just transforming voltage: They actually form the backbone of modern energy grids, and their reliable operation is crucial to ensuring a stable and resilient power supply.


If you haven’t had the chance to see our transformer model in person, now you can learn all about innovative transformer technology from wherever you are by watching the playouts on the right hand side.

Innovative traction transformers “Tractronic® Thinity”

Siemens presents its latest innovation highlight: The Tractronic® ThinityTM transformers will be installed in the trendsetting Siemens regional train platform Mireo®. The highly innovative transformer design results in an ultra-low weight of the infinity-symbol shaped Tractronic® ThinityTM transformer (approx. 25% less weight). The decreased weight will not only make the trains less energy-consuming. There will also be a higher capacity for passengers, monitoring equipment and passenger infotainment on board. Further benefits of the development are: more freedom of movement, shorter construction times, and optimized components – together these aspects form the truly unique Tractronic® ThinityTM transformer.


Download our Tractronic® Thinity brochure

Distribution transformers in new clothes

In March 2017 Siemens was honored with the IF award for its innovative transformer design. Along with the eye-catching layout of its transformers, Siemens now announces the renaming of two product lines: FITformer and GEAFOL Neo. FITformer is the name of the transformer family now congregating all liquid immersed distribution transformers while GEAFOL Neo is the modern version of the current GEAFOL Basic. The new brand names reflect Siemens’ innovation leadership and top-end quality. Siemens FITformer and GEAFOL stand for eco-friendliness, high efficiency and maximized availability. While the names and visual appearance of our products will change, our expertise and quality remains the same. 

Resilience: Pretact® – React in advance

Keeping grids resilient - at any time with Siemens Transformers

Reliability of energy grids is a matter that effects everybody involved in the business. Siemens Transformers offers a whole portfolio to offer grid resilience wherever needed. Our concept, named Pretact®, for resilient grids comprises a three-pillar-plan to enable our customers to prevent failures, protect their equipment and react in cases of emergency. Learn more on this topic in our infographics, use cases and collaterals. Our new concept addresses emergencies, retrofits and new installations along the entire energy value chain to increase network stability by modular feature/ solution architecture for power and distribution transformers.

Installing a mobile resilience unit within 3 days

The idea of mobile resilience units is to replace a large EHV-transformer by three compact and versatile single-phase units – either for planned or unplanned outages. The transport and installation can be completed within 30 working hours.


See in our slideshow how it works!

Visual Design: Shaping the future of transformers!

Have you ever asked yourself why a transformer looks the way it does? The most innovative engineering, materials and technologies are hidden inside. We have decided that in future our leading electrical and mechanical design should be visible from the outside.


Honored with the coveted iF Design Award 2017: the Transformer Family Design and the Design of the Mobile Resilience Unit as part of the Pretact® Concept.


Check your transformer’s compliance with EU requirements

As of July 2015, distribution and power transformers put into service within the European Economic Area (EEA) must comply with the new requirements of the Ecodesign Directive from the European Commission. The directive aims to improve energy efficiency, environmental compatibility and thus to reduce CO2 emissions. Siemens transformers can be designed to fulfill the new EU requirements.

Does your transformer’s Peak Efficiency Index satisfy the new EU requirements?  

The entered values equal a Peak Efficiency Index of

Target value:
Your transformer satisfies the new EU requirements and is ready for action!

If you still have any doubts or questions, we are pleased to help you.

Your transformer does not satisfy the new EU requirements and is not allowed to go in operation within the EEA. The loss level has to be decreased.

We are pleased to help you with any questions or further information.

Calculate your transformer’s efficiency

With our free Siemens Transformer App, you can calculate and compare noise and efficiency values of different transformers on the fly:

Always get the most out of your products

Do you have any questions regarding our transformer services?

Contact our support

Fields of operation

Find out why Siemens makes a difference

In more than 100 countries and for more than 100 years, transformers made by Siemens have been synonymous with top quality. The extreme high reliability (mean time between failures) is only one example of this quality. To ensure things stay this way, we are constantly working with high level experts on research and new developments. Furthermore, we are always close to our customers – thanks to our global manufacturing and service network. See for yourself, why our transformers make a difference!

Green Transformers with ester insulation

Synthetic and natural esters are beneficial alternatives to mineral oil as an insulating liquid in transformers. Their high flame and flash point as well as their biological degradability make them a shooting star among the cutting-edge transformer materials available nowadays. As a brand new innovation using synthetic ester, Siemens Transformers has manufactured and successfully tested three power transformers for the 400 kV-level with synthetic ester insulation and waste heat usage.   Find out more about alternative environmentally friendly transformer insulation and current use cases (Zip Download)

Reliable power transmission from New Jersey to New York City

  How do you provide sufficient and reliable power for a megacity like New York? Hudson Transmission Partners, LLC, awarded Siemens with the contract to connect the power supply networks of New Jersey and New York for a 660 MW back-to-back HVDC system. The challenge has been to provide a stable interconnection of two independent grids in an area with limited space and restrictive noise requirements, all within a short time. Eight Converter Transformers for HVDC Transmission helped to master this challenge and to ensure a reliable power supply for New York City.


Free Basic Transformer-Training

Watch our training to understand the functionality, setup and operation of power transformers. Our training explains the transformer principle and gives an overview about different transformer types as well as their components and information on their operation and ageing – including life extension measures.

Get in contact with our Customer Service

You can contact us 24/7.
We are looking forward for your call or online request.

Phone +49 180 524 70 00