高海拔地区±800 kV换流变压器直流耐压试验回路空间电场分布仿真分析

Simulation Analysis of Space Electric Field Distribution in DC Withstand Voltage Test Loop of Converter Transformer±800 kV in High Altitude Area

根据±800 kV换流变压器直流耐压试验要求,考虑高海拔环境对电场分布的影响,采用COMSOL有限元分析软件,对海拔3000 m条件下,由直流高压发生器、连接线、换流变本体组成的±800 kV换流变压器直流耐压及极性反转试验回路进行空间电场分布仿真分析。仿真结果表明,试验回路空间最大电场强度分布在阀侧套管均压环上,且小于海拔3000 m的起晕场强;当换流变与直流高压发生器距离大于2 m,理论上各设备之间不会产生电晕。

According to the DC withstand voltage test requirements of±800 kV converter transformers,considering the influence of high altitude environment on the electric field distribution,adopting the finite element analysis software COMSOL,the elevation of 3000 m under the condition of the dc high voltage generator,cables,change of rheological ontology+800 kV converter transformer dc withstand voltage and polarity reversal test loop simulation space electric field distribution analysis.The simulation results show that the maximum electric field strength in the test circuit space is distributed on the valve side casing pressure equalizing ring,and is less than the corona initiation field strength at an altitude of 3000 m;When the distance between converter and DC high voltage generator is more than 2m,theoretically there will be no corona between each equipment.