SMA provides auxiliary power supplies for a total of 42 three-car metro trains for Metro Kaohsiung. The trains will be used in revenue service in Taiwan as of the beginning of 2007. The auxiliary power supply for the new metro trains for Metro Kaohsiung belongs to SMA's product family MEE-NTSD (SD = Short Distance) for regional trains and is based on the platform MEE-NT. SMA has thus an innovative and sophisticated module platform proven in daily use for auxiliary power supplies in different applications.

Each MEE-NTSD auxiliary power supply is integrated into one separate underfloor container. A partly redundant double system, as for the Metro Kaohsiung, therefore consists of two separate underfloor containers that can be positioned side by side or underneath different cars as well. The underfloor containers are nonwelded enclosures made of stainless steel. This technology makes it possible to design ultra-lightweight enclosures. A modular system is used for the containers as well allowing to simply adjust them to the vehicle requirements. As for dimensions and weights, new standards are set. An MEE-NTSD auxiliary power supply has a weight of 825 kg to 900 kg according to input voltage and equipment (options, such as contactors or emergency starting units). In addition to the requirements referring to modularity and noise emission, different ambient conditions were considered in the development of the enclosure technology. Thus, the system can be used worldwide without complex adjustments.

Conclusion
SMA's MEE-NTSD is a sophisticated platform of auxiliary power supplies for short-distance traffic. Based on this innovative and trendsetting platform it was possible to develop a very compact and ultralightweight auxiliary power supply for metro applications. Specifically the low system weights of well below 900 kg are an outstanding system feature.