A Study on The Expansion and Contraction in Accordance with Temperature Change of Contact Wire and Messenger Wire

온도 변화에 따른 전차선 및 조가선의 신축에 관한 연구

This paper presents expansion and contraction in accordance with temperature change of contact wire and messenger wire. The tensioning device is designed and installed to pull the contact wire and messenger wire straight at all times. Pulling a contract wire straight ensures that smooth contract is maintained between the contact wire and pantograph of an electric train, and this makes it possible to ensure a stable supply of electricity to the train. Normally, tensioning devices are installed at two positions over a distance of 1.0[km] to 1.6[km] per line. In installing the tensioning device, therefore, it is necessary to study the stroke(the range of the extension/contraction rate of the tensioning device compatible with that of the contact wire and messenger wire due to change in temperature). This paper introduces and discusses this topic.