Pretact® – Available for the complete Transmission Products portfolio now

A growing population and an increasing standard of living mean that the supply of electricity has never been so important. Following the growing relevance the well established grid resilience concept for power transformers has been extended to the complete transmission product portfolio. Today’s challenge is not only to prevent and protect transmission grids from outage risks, but also to find effective tools to use when reacting to an emergency in order to reconnect the grid as quickly and efficiently as possible. Keeping grids resilient at any time with Siemens Energy Transmission Products.


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The Concept

Pretact® – The well established transformer resilience concept now available for the complete transmission product portfolio – for even more grid stability

Maximum grid resilience is the target of all utilities, generators and transmission operators worldwide. Siemens has developed a concept to achieve this target based on the three pillars “PREVENT”, “PROTECT”, and “REACT”. It comprises a comprehensive set of modular features to prevent and protect transformers and high-voltage products better from operational issues as well as against natural disasters or forced outages. In addition, highly flexible “mobile resilience units” provide a chance to react quickly in case of an emergency or planned outages like maintenance.


Keyvisual Pretact EcoSafeT
Virtual event, October 2020

Product Launch: Pretact EcoSafeT™

Watch the recording of the Pretact EcoSafeT™ product launch from October 22, 2020 and see how we are setting new standards in environment, health and safety for fire safe substations.

The replay is just one click away


Prevent operational issues

Sustainable materials, increased transparency and longer lifetime

Siemens offers extremely reliable transmission products at the highest level of innovation. With the “blue portfolio” of switchgear products and ester insulation for transformers customers can not only increase sustainability but also achieve operational benefits like less maintenance, higher fire safety and longer lifetime.

In addition Siemens offers a complete service portfolio including condition monitoring assessment and preventative maintenance. Retrofit and repair services can also help to extend the lifetime of transmission products and lower operational risks.


TLM™ – Transformer Lifecycle Management

Ester technology

Eco-transparency – Blue Portfolio

Transformer Service

High-voltage product services

Protect against natural disasters and forced outages

Highly resistant protective measures and protection equipment

Siemens offers tailor-made protective measures. Some of them can even be installed in products that are already connected to the grid.

For transformers for example Siemens developed bullet-resistant protectors. Non-magnetic steel inserts prevent overheating and ensure that the transformer is GIC-safe.

Besides Siemens air-insulated switchgear products and bushings can be equipped with composite insulators. Protection equipment like surge arresters and coils provide various application related benefits such as enhancing network reliability and safety, extending equipment life and increasing transmission capacity.


Bullet-resistant transformers
Transformers with DC compensation
Tank rupture-safe transformers

Coil products

Surge arresters

Earthquake-tested GIS

React to emergencies and temporary outages

A mobile first-aid kit

In the case of a blackout being unavoidable, Siemens Transmission Products has designed a strategy beyond replacement.


Plug & Play concepts to reestablish energy flow after breakdown in the shortest time period possible for:

  • Mobile Transformers and reactors
  • Mobile Gas-insulated switchgears
  • Power voltage transformers (measurement and auxiliary power supply)
  • Bushings

Spare product concepts at customer sites for specific products e.g. AIS and GIS also reduce outage times significantly.


Variable Shunt Reactors
React Rapidly to Emergencies

Mobile substation solution for emergencies

Mobile Resilience Transformers
Mobile Resilience Transformers are out-of-the-box products that can also be tailor-made as customers are used to for regular power transformers. In principle, all existing innovations within the design portfolio of Siemens Transmission Products are available.

Customer Benefits

  • A comprehensive concept to increase grid resilience and network stability
  • To prevent, protect and react at the entire energy value chain (end to end)
  • Modular feature and solution architecture to meet almost all regional or application needs, combining approved technologies and latest innovations
  • The right choice for emergencies, retrofit, upgrades and new installations for your intermediate or long-term solution to network stability challenges
  • Ecofriendly transformers and switchgear products for highly populated as well as rural areas
  • Save time and money while enjoying perfect peace of mind in terms of grid resilience

Infographic: Power Transformer Grid Resilience
Infographic: Distribution Transformer Grid Resilience

Infographics: Pretact® – Increase Grid Resilience at any time

News and Media

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Learn where the features of Pretact® are already in place and running – for the benefit of our customers and their consumers.
Whitepaper Download

Bypassing transformers

Our mobile resilience units are THE multifunctional pocket knife within the transformer industry: They not only serve as a means of first reaction in case of an unplanned outage, but also come in handy to bypass EHV transformers that need maintenance (planned outage). Learn how it works in our whitepaper.