| Kazuhiko Nagasawa | Signaling & Power Supply Systems Dept., Transport Management & Control Systems Div., Transportation Systems Div., Industrial Systems, |
| Tetsuya Kato | Power Electronics Design Dept., Information & Control Systems Div., Information & Telecommunication Systems, |
| Tomomichi Ito | First Dept. of Systems Research, Hitachi Research Lab., |
| Tsuyoshi Yamazaki | Industrial System Supervisory Dept., Kokubu Engineering & Product Div., Hitachi Works, Power Systems, |
At The Third Session of the Conference of the Parties to the United Nations Framework Convention on Climate Change held in Kyoto in 1997, gases that contribute to global warming were specified, and since then the needs of society regarding environmental conservation have become more and more urgent. Aiming at meeting these needs in the field of railway systems, which are fundamentally benign to the global environment, Hitachi has developed various commercial transformer systems for railway use that contribute to further reduction of greenhouse-gas emissions. In particular, two key products were developed: a regenerative energy absorbing equipment for railway systems that use lithium-ion batteries like those applied in hybrid vehicles; and a completely sulphur hexafluoride (SF6)-gas-free, 72-kV dry-air insulated switchgear unit that uses absolutely no SF6 gas (which has a high global-warming potential and has been conventionally used as the insulating medium in transformers). By applying these products, we have been able to construct an environmentally-friendly transformer system for electric railways.
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The Hitachi Hyoron (Japanese Only) |
substation, regenerative energy absorbing equipment
