外部振动对500kV交联聚乙烯电缆敷设条件的影响  

Influence of External Vibration on Laying Condition of 500 kV XLPE Cables

作　　者：刘骥[1] 张明泽[1] 张振鹏[2] 赵健康[2] 陈昕[1] 

机构地区：[1]哈尔滨理工大学工程电介质及其应用教育部重点实验室,哈尔滨150080 [2]中国电力科学研究院,武汉430074

出　　处：《高电压技术》2017年第2期673-681,共9页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2012CB723308)~~

摘　　要：高压交联聚乙烯(XLPE)电缆长期在振动环境中运行时将导致绝缘结构疲劳损坏,为了分析交联聚乙烯电缆固有频率与外部振动耦合条件下的位移与内部应力分布,在简支梁固有频率计算及振动模态分析的基础上,仿真获得了不同敷设条件下外部频率对电缆内部应力、位移分布的影响。仿真结果表明:铁路桥梁敷设电缆时,敷设距离的制约使得电缆固有频率处内部应力、位移最大值都急剧增大;隧道敷设电缆时,其内部应力、位移分布呈周期性波动;在共振与非共振频率下,内部应力、位移的大小相差很大;经仿真计算得出,隧道内500 kV交联聚乙烯电缆的敷设间距应小于3.42 m,以防止电缆共振。根据电缆模态分析,提出交联聚乙烯电缆在强振动区域敷设时应适当减小电缆夹具间距,避免外部频率与电缆固有频率耦合产生共振而导致电缆损坏,这对制定强振动区域内电缆敷设方式及运维策略具有指导意义。Operating in vibration environment, high-voltage XLPE cables will lead to the fatigue damage of insulation. In order to analyze the displacement and stress distribution under the coupling conditions of inherent and external vibration frequency, the effects of external vibration frequency on the distribution of inner stress and displacement are simulated on the basis of the inherent frequency calculation of simple beam and vibration mode analysis. The results indicate that the limitation of laying distance of laying cables on railway bridges will sharply increase the internal stress and maximum displacement at the inherent frequency.When laying cables in tunnels, the internal stress and displacement distribution fluctuate periodically; under resonant and non-resonant frequencies, the magnitude of stress and displacement vary greatly The simulated results reveal that the laying spacing of 500 kV cables in ttmnels should be less than 3.42 m in order to avoid resonance. According to the cable model analysis, it is better to decrease the spacing of cable fixtures for laying high voltage XLPE cables into the strong vibration areas to avoid resonant failures from the coupling of external vibration and inherent frequencies, which is of guiding significance to develop the ways of cable laying and maintenance strategies in strong vibration areas.

关 键 词：500 KV 交联聚乙烯电缆 振动 固有频率 内部应力 位移分布 

分 类 号：TM247[一般工业技术—材料科学与工程] TM75[电气工程—电工理论与新技术]