架空电力线路故障状况下对埋地金属管道感性耦合的传输线计算模型  

Transmission Line Modelling of Inductive Coupling of Overhead Power Lines Subjected to Grounding Fault to Underground Metal Pipeline

作　　者：齐磊[1] 原辉[1] 李琳[1] 崔翔[1] 

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,北京102206

出　　处：《电工技术学报》2013年第6期264-270,共7页Transactions of China Electrotechnical Society

基　　金：中央高校基本科研业务费专项资金资助(09TG01)

摘　　要：架空电力线路发生短路故障时会对邻近的埋地金属管道产生阻性耦合和感性耦合影响。文中基于架空电力线路与埋地金属管道并行时的多导体传输线模型,将杆塔接地电阻分别进行集中参数处理和分布参数等效,同时结合传输线两端和故障点处的电压、电流约束条件,推导了两种情况下传输线沿线电压、电流分布的计算公式,进而利用线导体矩量法仿真研究了电力线路杆塔入地电流对埋地金属管道的阻性耦合影响。通过与现有软件的计算结果进行比较,验证了本文两种计算方法的正确性和有效性。最后,应用本文方法仿真研究了电力线路故障状况下管道平行长度、平行接近距离和大地电阻率等对管道防腐层干扰电压的影响程度,研究成果可为管道安全评估及确定线路和管道的最小接近距离提供依据。Resistive coupling and inductive coupling effects are produced on adjacent underground metal pipeline when overhead power lines suffer from grounding fault. In this paper, based on the multi-conductor transmission line model of overhead power transmission lines and underground metal pipeline, the tower ground impedances could be modeled by lumped parameter and distribution parameters, and combining with the constraint conditions of voltages and currents at the transmission line ends and the fault point, the formulas of voltages and currents distribution along the transmission are derived. Then based on the method of moment, the resistive coupling voltage on the oil/gas pipeline parallel to the transmission line because of the currents along the towers is investigated. The methods are verified to be correct and effective by compared with the results of CDEGS. At last, research on the influence on the coating stress voltage of some factors such as parallel length, separation distance and soil resistivity are given by the method mentioned in the paper, and the proposed method can be used for the pipeline safety evaluation and the determination of minimum distance between the pipeline and the power transmission line.

关 键 词：架空电力线路 埋地金属管道 短路故障 传输线模型 感性耦合 矩量法 

分 类 号：TM83[电气工程—高电压与绝缘技术]