65 years of service – MR's oldest tap changer
Presentation of an anniversary plaque: Alfred Kaltenegger and Roland Jost from the Ingolstadt power station with MR representatives Werner Schafberger and Christian Schaider (from left).
It's official: The oldest tap changer still in service anywhere in the world can be found at the UNIPER oil-fired power station in Ingolstadt. It is an OILTAP® DIII produced in 1950 by Maschinenfabrik Reinhausen (MR). This tap changer is evidence of the one-of-a kind reliability and durability our products have. With regular maintenance, they still work smoothly after 65 years.
As a part of the "90 Years Of High-Speed Resistor-Type Tap-Changers" anniversary cel-ebrations, the company went in search of the world's oldest tap changer that is still in op-eration. We asked approximately 10,000 customers to take part in the search with us. Their replies were impressive. Customers sent photos of name plates and documents that confirmed the long-lasting quality of our products. The key to this longevity is regular maintenance, for which qualified MR specialists around the globe are available.
90 years of the high-speed resistor-type tap-changer
In September 1925, Dr. Bernhard Jansen filed the patent for the first high-speed resistor-type tap-changer in the world. He invented a control mechanism that allowed electrical voltage to be controlled while under load and without any interruptions. This was a mile-stone in the history of power engineering as well as the start of the partnership with the founders of the Maschinenfabrik Reinhausen (MR). Since then, MR has played a key role in shaping the industry and defined new standards through consistent further develop-ments. The company is still owned by the founding families, Scheubeck and Jansen, and has proven its independence and self-reliance over the generations.
Installed base: 250,000 on-load tap-changers worldwide
On-load tap-changers from MR have been in use around the world for almost a century. Having sold 250,000 units, the company has the largest installed base as well as the most operating experience. Approximately 80 percent of the tap changers are still being used today and demonstrate exceptional quality and reliability, which is of first and foremost priority to customers.