换流变压器现场高压试验电晕分析及措施

Analysis of Onsite High-Voltage Test Corona in Converter Transformer and Measure

在现场开展换流变压器交直流耐压、局部放电等高压试验时,高压电晕会对试验结果产生严重干扰,电晕损失也会增加试验电源的负担。结合±800 k V特高压直流工程建设实际,建立高压试验中防晕导线的模型,仿真分析在不同电压类型、不同电压等级、不同导线直径以及不同导线连接状况下试验线路上的场强分布状况,得出影响防晕导线最大场强的影响因素,并对防晕导线的对接结构进行改进,开发出了新型防晕导线。

When high-voltage tests of converter transformer such as alternating current and direct current withstand voltage and partial discharge were carried out on site, the high-voltage corona would seriously disturb the test results and the corona loss would increase the load of experimental power supply. Combined with ±800 kV extra-high voltage direct current practical engineering construction, this paper established the anti-corona wire model in high-voltage test. Simulation analysis was made to the field intensity topography of test circuits under the conditions of different voltage type, different voltage grade, different wire diameter and different wire connection, so as to obtain the influence factor on the maximum field intensity of anti-corona wire, improving the docking structure of anti-corona wire and developing new type of anti-corona wire.