共享杆塔时域仿真模型及线缆雷电流分布  

Time Domain Simulation Model of Shared Tower and Lightning Current Distribution of Cable

作　　者：彭程 阳晋 邹军[1] PENG Cheng;YANG Jin;ZOU Jun(State Key Lab of Control and Simulation of Power Systems and Generation Equipment,Department of Electrical Engineering,Tsinghua University,Beijing 100084,China;Beijing National Railway Research&Design Institute of Signal&Communication Group Co.,Ltd.,Beijing 100070,China)

机构地区：[1]清华大学电机系电力系统及发电设备控制和仿真国家重点实验室,北京100084 [2]北京全路通信信号研究设计院集团有限公司,北京100070

出　　处：《高压电器》2022年第4期40-46,共7页High Voltage Apparatus

基　　金：国家自然科学基金项目(52077111)。

摘　　要：雷击共享杆塔,雷电流可能通过沿塔布置的线缆的金属屏蔽层侵入弱电设备。为确保通信设备可靠运行,文中对共享杆塔雷电流分布情况展开时域仿真分析。首先基于矩量法和二端口网络理论,得到共用接地系统二端口阻抗参数频率响应;利用网络变换方法与矢量匹配法可得共享杆塔共用接地系统二端口T形等效电路;将接地系统时域仿真模型与Hara多波阻抗杆塔模型、线缆Bergeron模型相结合,仿真可得塔身及线缆雷电流分布情况。结果表明:土壤电阻率为100、300、500Ω·m时,线缆金属屏蔽层分流的百分比雷电流分别为5.79%、5.49%、3.81%,基于现有通信标准雷电流分流系数进行共享杆塔弱电设备防雷保护设计可确保设备可靠运行。In case of lightning strike of shared towers,lightning current may enter into the weak current equipment through the metal shielding layer of cables arranged along the tower.In order to ensure the reliable operation of communication equipment,the time-domain simulation analysis of lightning current distribution of shared tower is carried out in this paper.Firstly,based on the moment method and two-port network theory,the frequency response of two-port impedance parameters of common grounding system is obtained;The two-port T-shaped equivalent circuit of shared tower grounding system can be obtained by using network transformation method and vector fitting method;The time domain simulation model of grounding system,Hara multi-wave impedance tower model and cable Bergeron model are combined and simulated to obtain the lightning current distribution of tower body and cable.The results show that when the soil resistivity is 100,300 and 500Ω·m,the percentage lightning current shunted by the cable metal shielding layer is 5.79%,5.49%and 3.81%respectively.The lightning protection design of shared tower weak current equipment based on the lightning current shunting coefficient of the existing communication standard can ensure the reliable operation of the equipment.

关 键 词：雷电流分布 接地系统宽频响应 二端口网络 矢量匹配法 时域等效电路 

分 类 号：TM863[电气工程—高电压与绝缘技术]