RWE: On the grid with a double-walled design

For decades, open-air supply cabinets have been performing a vital service in the 380, 220 and 110 kV substations of the RWE transport and distribution network. However, due to the cost of corrosion protection and problems with the interior climate of the single-walled sheet steel enclosures, it was time to find a new solution.

“The concept presented by Rittal and SSS met our requirements and turned out to be the optimum solution based on an analysis of commercial and technical benefits.” Dr. Ulrich Küchler, Head of Primary Technology, RWE Westfalen-Weser-Ems Netzservice GmbH

Investing in the future

Stringent requirements were set out for the new enclosures, which would have to exhibit improved internal climatic conditions, offer corrosion resistance for over 40 years, be compatible with existing modules and be comprised of standard modules. Together, Rittal and Essen-based control unit manufacturer SSS Elektrotechnische Systeme presented a solution based on these demands. By combining Toptec outdoor enclosures from Rittal with the RWE intelligent modular design that has been tried and tested over the course of several decades, the partners developed a concept that RWE had made a compulsory requirement in early 2010.

Close to the standard but still flexible

The collaboration between RWE, SSS and Rittal culminated in a series product based on Toptec that can be delivered quickly. However, it had also been tailored to RWE in terms of its technical specifications and boasted exceptional flexibility in terms of accommodating a range of local conditions.

The power of two walls

The stainless steel base frame of the enclosure is based on the TS 8 system platform, while the doors, side components and roof are made from aluminium, which results in a weight saving of up to 40 percent. The double-walled design ensures better climatic conditions inside the enclosure and helps to prevent condensation. Despite these many benefits, the new solution costs no more than the single-walled variant.