高海拔现场与人工气候室下绝缘子交流污闪特性的比较

Comparison of AC Pollution Flashover Performances of Insulators in High Altitude Sites With That in Chamber Climate

高海拔下污秽绝缘子串电气性能将降低,国内外在高海拔现场和人工气候室对高海拔地区污秽绝缘子闪络特性开展了大量研究,但人工模拟试验结果与自然环境的试验结果等价性的问题罕见报道,分别在不同海拔的高海拔现场和人工气候室开展了不同型式绝缘子交流污闪特性对比试验研究,试验结果表明:蒸汽雾法下绝缘子交流污闪电压比湿污法下的高;随着海拔的增加,绝缘子串交流污闪电压将降低,其气压影响特征指数与绝缘子型式、盐密等有关;人工模拟试验结果与自然环境的试验结果具有等价性关系的研究结果可为高海拔地区输电线路外绝缘的选择和设计提供参考。

Electric performance of polluted insulator string deteriorates in high altitude regions. Lots of researches on flashover performance of polluted insulators under high altitude conditions are performed in high altitude sites and in artificial climate chambers home and abroad, however, the research results related to the equivalence between the test results performed in natural environment and those under artificial simulation are rarely reported. For this reason, the comparative testing researches on AC pollution flashover performances of various types of insulators in the sites with different high altitudes as well as those in artificial climate chamber are carried out respectively. Testing results show that the AC pollution flashover voltage under the condition of steam fog method is higher than that under the condition of slurry method; the AC pollution flashover voltage of insulator string decreases with the increasing of altitude and the exponent describing the influence degree of air pressure on pollution flashover voltage is related to the types of insulators and salt density and so on. Results of this research show that there is equivalence between the testing results in natural environment and those of artificial simulation, and this conclusion is available for reference to both selection and design of external insulation for transmission lines located at high altitude regions.