山火条件下±800 kV输电线路合成电场仿真研究

Simulation study on synthetic electric field of ± 800 kV transmission line under forest fire condition

800 k V输电线路在山火中火焰高温、火焰高电导率、固体颗粒物等因素作用下,容易导致输电线路周围电场发生显著升高,引发输电线路跳闸。为此,建立了山火条件下特高压直流输电线路合成电场非线性数学模型,该数学模型能够准确计算输电线路走廊在发生山火时是否会引发输电线路跳闸。以云广特高压直流输电线路为算例,采用Matlab仿真软件,分析了山火条件下与正常运行条件下地面合成电场。计算结果表明,山火条件下地面合成电场可达到正常运行情况下的39倍。

Under the influence of high temperature of flame,high conductivity of flame,solid particles and other factors,the electric field around the±800 kV transmission line is likely to rise significantly,which leads to the trip of the transmission line.Therefore,a nonlinear mathematical model of the synthetic electric field of UHVDC transmission line under the condition of forest fire is established,which can accurately calculate whether the transmission line will trip when the forest fire occurs in the transmission line corridor.TakingYunguang UHVDC transmission line as an example,the synthetic electric field on the ground under the condition of forest fire and normal operationis analyzed by using Matlab simulation software.The results show that the synthetic electric field on the ground under the condition of forest fire can reach 39 times of that under the condition of normal operation.