银川地区高压交流输电线路绝缘配合及选型

Insulation co-ordination and type selection of HVAC overhead transmission line in Ningxia area

高压交流架空输电线路绝缘子污秽耐受电压是绝缘配合及选型应用的关键问题之一。根据长棒复合绝缘子防污闪性能和选型技术要求,对其在工程应用中技术优势进行对比分析,按工频电压泄漏距离要求进行选择,并按大气环境灰密(NSDD)方法进行修正,提出了泄漏比距配置的上限值以及具体防污措施。分析结果表明:污秽绝缘子的表面电导与其闪络电压之间有着确定的对应关系。

Insulator pollution withstand voltage of HVAC overhead transmission line is the key prob- lem in application of insulation co-ordination and type selection. According to the technological re- quirements of long rod composite insulator preventing pollution flashover property and type selection, compares and analyzes its technology advantage in project application, type selection in the light of power-frequency voltage leakage distance requirements, revising according to air environment non soluble deposit density （NSDD） method, puts forward upper range value of leakage distance ratio allo- cated and concrete anti-pollution measures. The analysis result shows that the surface conductance of polluted insulator and its flashover voltage has definite parallelism relationship.