高海拔直流输电线路电场模拟试验与计算

Simulation Experiment and Calculation of DC Electric Field Caused by DC Transmission Line at High Altitude Districts

为了得出直流输电线路电场随海拔高度变化的规律,根据电磁场理论建立了直流输电线路数学模型并编写了高海拔直流输电线路电场计算程序,对不同海拔高度的直流电场进行了计算。同时分别在武汉、兰州、西宁、格尔木、拉萨和沱沱河等地对直流输电线路的电场进行了模拟试验。计算和试验结果表明:不同海拔高度的直流电场试验结果与理论计算值基本一致;在相同的条件下,线下地面直流电场随着海拔的升高而增加,海拔每升高1km,直流电场增加2～4kV/m。

500 kV Qinghai-Tibet DC transmission project will be built, and DC transmission line will firstly be built over 5000 m altitude in world, the station will firstly be built over 3000 m altitude too. The EM environment become worse as the altitude rises. Therefore, the mathematic model of DC transmission line was established, the DC electric field calculation program was programmed for high altitude DC transmission lines, and DC electric field of different altitude areas was calculated. Analog experiment was put to test the DC transmission lines electric field in Wuhan, Lanzhou, Xining, Germu,Tibet and Tuotuohe. The results of calculating DC electric field in deferent altitude areas almost match those from Analog experiment. On the same condition, the ground DC electric field under DC transmission lines increases as the altitude height rises, and the rising rate is 2-4 kV/m per 1000 m.