高速铁路贯通线电缆温升效应分析
陈凯
Analysis of Temperature Rise Effect in Highspeed Railway Continuous Through Line Cable
CHEN Kai
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作者信息:中铁第四勘察设计院集团有限公司， 430067， 武汉
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Affiliation:China Railway Siyuan Survey and Design Group Co., Ltd., 430067, Wuhan, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.09.027
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中图分类号/CLCN:U223.2
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栏目/Col:研究报告
摘要:
目的：为了保障高速铁路供电安全，需要对高速铁路贯通线电缆的运行状态进行实时监测。温度是电缆安全运行的重要指标，要正确判断贯通线电缆的运行状态，需对贯通线电缆的温升效应进行研究。方法：利用有限元分析法对贯通线电缆正常和故障状态时的温升效应进行了仿真计算，分析了外界大气压、环境温度、太阳辐照、敷设条件等外部条件对电缆温升效应的影响，研究了单相接地、相间短路、绝缘电弧击穿、电缆头接触不良、金属屏蔽层引入牵引回流等典型故障条件下电缆的温升效应；并分别进行了流经故障电流情况下和不同电缆敷设方式下电缆金属屏蔽层温升试验，以验证仿真结果的正确性。结果及结论：外界大气压和环境温度对电缆温升影响不大，太阳辐射会增大电缆温升，直埋敷设方式下的电缆温升明显高于泡水敷设；除单相接地故障的电缆金属屏蔽层温升不明显外，其余故障情况下电缆金属屏蔽层均有明显温升。
Abstracts:
Objective: In order to ensure the safety of highspeed railway power supply, it is necessary to conduct realtime monitoring of the through line cable operation status for highspeed railways. Temperature is an important indicator for the safe operation of cables, and studying the temperature rise effects in the continuous through line cable is necessary for accurately assessing its operational status. Method: Finite element analysis method is used to simulate and calculate the temperature rise effects in the continuous through line cables under normal and fault conditions. The influence of external factors such as atmospheric pressure, ambient temperature, solar radiation, and installation conditions on the temperature rise effects of the cables is analyzed. The aforementioned effects are investigated under typical fault conditions such as singlephase grounding, interphase shortcircuit, insulation arc breakdown, poor cable head contact, and introduction of traction return current through the metal shielding layer. Temperature rise tests are conducted to validate the simulation results, including tests on the temperature rise of cable metal shielding layer under circulating fault current or under different cable installation methods. Results＆Conclusion: Atmospheric pressure and ambient temperature have little impact on the temperature rise of cables, while solar radiation increases the temperature rise. The temperature rise of cables installed in direct burial mode is significantly higher than those installed submerged in water. Except for the cable metal shielding layer in the case of singlephase grounding fault, noticeable temperature rises are observed in the cable metal shielding layer under other fault conditions.
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