Abstract：Research purposes: With the development of the railway construction technology and the construction of passenger dedicated line in the mountain area，the traction power supply facilities have to be built in the tunnel．As the section post is simple and its impact range is small when it fails，SO it often substitutes for the traction substation to be installed in the tunnel. As the tunnel space is limited，close to the railway main line and a airtight and wet space，SO it is urgent to do research on the section postg layout，earthing，and disaster prevention and rescue．
Research conclusions: This paper describes a design of the section post in tunnel and the key points of selecting the equipments．In this design，the main wiring is simplified to save the field and the equipments are of dispersed layout for easy transportation and replacement．This paper also puts forward the key and difficult points for design of section post in tunnel according to the environmental speciality of the section post in the tunnel，researches the earthing of the section post，and introduces the principle of disaster prevention to make the section post in tunnel normal operation and provide the reference to the similar design．
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2010, Vol. 27 
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