TRANSFORM PARTNERS

On-load tap-changers are important devices for the stability of the network voltage. Our customer's requirements are exceedingly complex. That is why tailor-made problem solutions are developed by our specialists. Our motto: solutions from Reinhausen GmbH are distinguished by perfect functionality, low maintenance and long working life. We are not satisfied unless our customers are.

For about 80 years now we have been manufacturing on-load tap-changers and we still keep coming up with epoch-making innovations. The VACUTAP® series with its vacuum switching technology for on-load tap-changers in oil-immersed and dry-type transformers is now the most common form of technology in reactor-type tap-changers and has revolutionised resistor-type tap-changers.

We have been using this technology since the 1980s and are continuously refining it thus bringing you advantages such as no maintenance requirements before 300.000 switching operations. This has drastically reduced costs and increased availability of the transformer. To mention but a few of the many benefits: no oil carbonization, no replacement of contacts and no oil filter required.

ASTA Energy Solutions AG is an internationally operating industrial company headquartered in Oed, Austria, with a corporate history spanning more than 210 years. The ASTA Group employs approximately 1,400 people across six locations in Europe, Asia, and South America. ASTA develops and manufactures high-precision solutions for system-critical applications in high-performance energy technology. These solutions help increase efficiency, reduce energy losses, and ensure the reliable and safe use of electrical energy. ASTA’s technologies are applied across key areas of the energy value chain, from power generation and transmission to next-generation mobility solutions.

In the 2025 fiscal year, the ASTA Group generated revenues of EUR 695 million. ASTA is a long-standing and trusted partner to leading global technology companies, including Siemens Energy, Hitachi Energy, Andritz, and GE Vernova.

Sustainability is a core element of ASTA’s corporate strategy. Through integrated recycling processes and the development of circular material solutions, ASTA takes a pioneering role in building a resource-efficient, energy-optimized, and environmentally responsible industry, actively contributing to the global energy transition.

LTC Group, Legnano Teknoelectric Company, was founded by the Bertelli family, able to draw on a wealth of experience in the design and production of magnetic cores and laminations for a wide range of transformers and reactors. LTC Group is a family-run company with a managerial structure.

Today, it boasts an international presence and a position as market leader with production sites in Italy, United Arab Emirates and Taiwan. We are constantly investing in human resources, machinery, automation, and new production facilities in the world.

Thanks to a significant volume of data collected and tests carried out over 65 years of production in the transformer sector, LTC Group comes up with the most suitable solutions for any type of requirement from our customers.

HIGHVOLT Prüftechnik Dresden GmbH

HIGHVOLT Prüftechnik Dresden GmbH is the leading manufacturer of high voltage test equipment with more than 100 years of experience. We produce test systems for factory routine and on-site testing of transformers, cables, GIS and electrical components like bushings, tap-changers, etc.

Our product range includes AC and DC test systems as well as impulse voltage and current test systems. In addition, we also provide HV measuring devices. As a manufacturer of complete test systems, HIGHVOLT is an experienced turnkey supplier of large HV test fields, too. Furthermore, we offer the calibration service for measuring devices and the upgrade of control units and existing test fields.

As a pioneer in the development of mobile AC test systems, HIGHVOLT designed a new generation of mobile test systems for testing of power transformers. The new test system is based on a static frequency converter which replaces the motor-generator (M/G) sets. The compact and light weight design enables a cost effective realization of transformer testing in factory or directly on site.

Solutions for the transition to a sustainable society

Nynas offers bitumen and naphthenic specialty products for applications that touch people’s lives every day, for example in electrification and road infrastructure. Our core competence is to refine heavy molecules into high performance, long-lasting specialty products. We operate in an international market with a strong focus on Europe, working closely with customers to create solutions to meet challenges and capture opportunities in the transition to a sustainable society.

OMICRON is an international company that works passionately on ideas for making electric power systems safe and reliable. Our pioneering solutions are designed to meet our industry’s current and future challenges. We always go the extra mile to empower our customers: we react to their needs, provide extraordinary local support, and share our expertise.

Within the OMICRON group, we research and develop innovative technologies for all fields in electric power systems. When it comes to electrical testing for medium- and high-voltage equipment, protection testing, digital substation testing solutions, and cybersecurity solutions, customers all over the world trust in the accuracy, speed, and quality of our user-friendly solutions.

Röchling Industrial is leading manufacturer of laminated densified wood, pressboard and FRP for generators and transformers. Our products are used for electrical and mechanical purposes in the electrical industry. Our leading brands Lignostone® Transformerwood®, Durostone®, Permaglas® and Glastic® stand for durability and reliability. Well-known manufacturers use our composite materials since 70 years for their production of all kinds of oil filled power transformer, as well as for traction, industrial and dry type transformers.
Generator, switchboard, switchgear and thyristor producer, besides other electrical appliance manufacturer, are using our products since decades.

European market leader and one of the world’s top players in grain-oriented electrical steel, with production sites in Germany and France – that is thyssenkrupp Electrical Steel. With its highly sophisticated, high-tech steel powercore®, thyssenkrupp Electrical Steel makes an exceptionally valuable contribution to the effective fight against climate change and to shaping the energy transition in a positive way. powercore® is and remains an almost indispensable core material for the energy-efficient and sustainable generation, transmission, distribution, and use of electrical power.

Together, Trench and HSP form the Grid Connection business unit of Trench Group. Since 1893, we have developed and manufactured high-voltage bushings and cable terminations for the world's most demanding grid applications - from generator bushings and RIS/RIP transformer bushings up to 1,200 kV, to cable terminations up to 500 kV (AC/DC), wall bushings up to 800 kV, and GIS bushings up to 550 kV.

With four factories across China, France, Germany, and the United States, and close to 400,000 bushings installed worldwide, we link critical components across the grid, ensuring reliability, performance, and safety where it matters most.

Weidmann offers a wide portfolio of high-quality insulation products, including Transformerboard, paper, and engineered paper, as well as sophisticated components and transformer-related accessories. Our global network of experts provides consulting services and operational support for a wide range of transformer applications.