A design scheme for the electrical phase separation of rigid overhead contact system in long gradient sections within tunnels
Rigid overhead contact system joint sections are only 8～12 m long,which can significantly shorten the length of joint phase separation.To solve the design problem of phase separation in long gradient sections within three tunnels of Lijiang-Shangri-La railway,this article draws on the design scheme of joint phase separation of flexible overhead contact system systems,focusing on factors such as the insulation gap of insulated joint sections and the thermal expansion and contraction of joint sections.The neutral section and non-electrified section lengths of rigid suspension anchor joint phase separation are corrected and combined with actual engineering conditions.Then,a design scheme for the short phase separation of rigid overhead contact system is proposed,shortening the phase separation length to 23 m.The dynamic simulation of the pantograph and overhead contact system is validated to meet the dynamic characteristics requirement for a speed of 160 km/h.After the implementation of the scheme,the dynamic detection of the line reached a speed of 160 km/h,and there is no obvious arcing phenomenon at the short phase separation section of the rigid overhead contact system.As a result,all dynamic indicators meet the standard requirements.The successful application of this scheme has an important reference value for the phase separation design of overhead contact system in complex conditions with speeds above 120 km/h.
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