隧道内长大坡道区段刚性接触网短电分相设计方案

A design scheme for the electrical phase separation of rigid overhead contact system in long gradient sections within tunnels

刚性接触网锚段关节仅有8~12 m,可大幅缩短关节式电分相长度,为解决丽香铁路3处隧道内长大坡道的电分相设计难题,文章通过借鉴柔性接触网关节式电分相设计方案,重点考虑绝缘锚段关节绝缘间隙、锚段热胀冷缩等因素,修正刚性悬挂锚段关节式电分相中性段和无电区长度,并结合工程实际条件,提出刚性接触网短分相设计方案,将电分相长度缩短至23 m,并通过弓网系统动态仿真验证其弓网动态特性可满足速度160 km/h要求。方案实施后,线路动态检测达速160 km/h,刚性接触网短电分段处无明显燃弧现象,各项动态指标满足标准要求。该方案的成功应用对速度120 km/h以上复杂工况线路的接触网电分相设计有重要借鉴意义。

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.