不同接地方式下地线电位分布与损耗分析

Study on overhead line loss and potential distribution of transmission line under different grounding modes

架空输电线路与地线之间因耦合作用使得地线存在感应电压,不同接地方式对地线感应电压及能量损耗有影响。首先分析了地线感应电压分量的组成,随后采用暂态仿真计算软件EMTP-ATP建立普通地线和光纤复合地线在不同接地方式下的仿真模型,通过计算得到不同地线接地方式下普通地线和光纤复合地线的地线电位、入地电流分布规律,对比分析不同接地方式下地线的能量损耗。仿真结果表明:两种地线均采用逐塔接地时的电能损耗最大;普通地线单点接地且OPGW地线逐塔接地时,地线电能损耗大约减小一半。研究结果可为实际输电线路的防雷设计与优化提供理论参考。

Because of the coupling effect between the overhead transmission line and the grounding line,the induced voltage exists in the grounding line.Firstly,this article analyzes the component composition grounding induced voltage.Then,the transient simulation software EMTP-ATP is used to construct simulation models of common grounding and OPGW grounding wires under different grounding modes,from which the distribution of grounding potential and the current distribution are obtained.And then,the energy loss is contrasted under different grounding methods.The simulation results show that the maximum loss of electric energy is achieved when two ground wires are grounded tower by tower.The power loss of the ground wire is reduced by about half when the ground wire is single point grounded and OPGW ground wire is grounded tower by tower.The results can provide theoretical reference for lightning protection design and optimization of actual transmission line.