埋地高压电缆与金属管道邻近敷设时电磁影响模型及计算方法  

Modeling and Analysis Method of Electromagnetic Influence of Buried High⁃voltage Cable Adjacent to Metal Pipe

作　　者：罗楚军[1] 王亚婕 岳浩[1] 卢铁兵 LUO Chujun;WANG Yajie;YUE Hao;LU Tiebing(Central Southern China Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Wuhan 430071,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China)

机构地区：[1]中国电力工程顾问集团中南电力设计院,湖北武汉430071 [2]新能源电力系统国家重点实验室(华北电力大学),北京102206

出　　处：《华北电力大学学报（自然科学版）》2023年第3期57-66,共10页Journal of North China Electric Power University：Natural Science Edition

基　　金：中国能源建设集团规划设计有限公司科技项目(GSKJ2-D04-2020).

摘　　要：高压电缆线路对邻近金属管道的电磁影响问题关系到金属管道的安全稳定运行,是城区电缆线路设计时必须考虑的问题之一。但是,由于土壤结构、电缆和管道结构的复杂性,尚缺乏有效的电磁影响建模和计算手段。基于多导体传输线理论,建立了埋地三相电缆与金属管道邻近敷设时的电磁影响分析模型,阐述了其单位长阻抗矩阵和导纳矩阵的计算方法。针对存在公共接地阻抗的诺顿等效和戴维南等效端口情况,提出了基于级联参数矩阵的金属管道和电缆屏蔽层感应电压的计算方法,并拓展至三相电缆交叉互联以及电缆与金属管道交叉跨越、斜向接近的复杂情况,并可以考虑电缆短路故障的影响。通过算例,验证了建模方法和计算方法的有效性。研究结果为邻近金属管道时埋地电力电缆线路的设计提供了技术手段。The electromagnetic influence of high-voltage cable lines on adjacent metal pipes is related to the safety and stable operation of metal pipes,and it is one of the key considerations when the cables are set near the metal pipes in the urban area.However,due to the complexity of the soil and the system of cables and metal pipes,the valid modeling and calculation method about the electromagnetic influence are still lacking.Based on the Multiconductor Transmission Lines(MTL),we establish one calculation model of electromagnetic influence when three-phase high voltage cables are laid adjacent to a buried metal pipe and elaborate the method of calculating the per-unit-length impedance and admittance matrices.For the Norton equivalent circuits and Thevenin equivalent circuits terminal ports with common grounding impedance,we propose the method to calculate the induced voltage in the shielding layer of the cable sheaths and metal pipeline based on the cascade parameter matrix.The method is extended to the cases involving the cross-bonding of three-phase cables,the crossover and the approach between the cables and the metal pipe,and the short-circuit fault of the cables and the influence of short-circuit fault of cables is considered when the method is applied.Finally,validity of the model and calculation method are verified by the results.The research can help to design the buried cable layout when the metal pipelines exist nearby.

关 键 词：电磁影响 埋地高压电缆 计算模型 金属管道 多导体传输线 

分 类 号：TM73[电气工程—电力系统及自动化]