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Large order of distribution transformers with biodegradable ester insulation Siemens, one of the most innovative suppliers of distribution transformers, has successfully tested and delivered the first units of distribution transformers for Netze BW insulated with Midel eN natural ester. This insulation fluid is organic, non-toxic, biodegradable, and has a higher flash point than mineral oil. The ecological transformers will be installed in the overall service area of Netze BW, with special attention to environmental protection. Netze BW is one of the EnBW subsidiaries, operating around 26,500 distribution transformers, of which 1,000 units must be replaced annually or reinstalled.. As the first step they ordered 102 natural-ester-insulated distribution transformers. The delivery was scheduled to start at the beginning of February and to be completed by the beginning of April 2016. Once installed, the transformers will be closely monitored by Netze BW and the results will be evaluated in cooperation with the University of Stuttgart over a specific period of time to further prove the benefits of this alternative insulation. Transnet BW, another 100 percent EnBW subsidiary, is one of the major transmission grid operators, and was the first operator to install large power transformers with natural ester insulation. The positive experience with the large Siemens transformers was one pivotal factor for the large order of distribution transformers. Furthermore, the customer chose Siemens transformers because they fully meet the expectations regarding safety and reliability. Dr. Beatrix Natter, CEO Siemens Transformers, says “The use of Midel eN ester-insulated transformers impressively proves how a network operator can apply economically efficient solutions which are at the same time ecologically sustainable. In order to make available to all grid operators the advantages of natural and synthetic ester isolation, Siemens offers a wide portfolio of this state-of-theart eco-friendly technology.” To date, this order represents the largest order ever for environmentally friendly insulated distribution transformers in Germany. Siemens AG Energy Management Division Transformers Katzwanger Strasse 150 90461 Nuremberg, Germany Contact Ferenc Demendi [email protected] Publisher and Copyright 2016: Siemens AG Energy Management Division Freyeslebenstrasse 1 91058 Erlangen, Germany siemens.com/transformers