220kV复合绝缘子机电性能试验研究  

Experimental Study on Electrical and Mechanical Properties of 220 kV Composite Insulators

作　　者：王建国[1] 方春华[1] 刘洋[1] 韩芳[2] 薛健[1] 陈俊杰[1] 

机构地区：[1]武汉大学电气工程学院,湖北武汉430072 [2]沈阳市供电公司,辽宁沈阳110006

出　　处：《高压电器》2008年第4期332-334,346,共4页High Voltage Apparatus

基　　金：沈阳供电公司科研资助项目(20060710)

摘　　要：复合绝缘子的电气及机械性能是复合绝缘子能够长期可靠运行的保证。笔者抽取了11支在东北地区挂网运行不同时间的220 kV复合绝缘子,利用工频试验变压器、冲击电压发生器和机械拉力机分别进行了自然污秽闪络、人工污秽闪络、50%雷电冲击闪络、50%机械负荷耐受和机械破坏负荷等性能测试。结果表明:复合绝缘子的电气性能仍然处于较高水平,污闪电压和雷电冲击闪络电压与运行时间没有明显关系,与绝缘子结构高度成正比关系,早期楔式结构的复合绝缘子机械性能下降明显,且160 kN吨位复合绝缘子机械强度降至额定负荷以下,建议有关部门密切关注复合绝缘子机械性能的下降,采用定期抽检的方法避免事故的发生。Electrical and mechanical properties are the key factors for long service time of composite insulator. Eleven 220 kV composite insulators that had worked on the northeast grid of China for different time were selected and tested in order to investigate their electrical and mechanical properties. Power frequency transformer, impulse voltage generator and tensile machine were utilized to test the natural pollution flashover voltage, artificial pollution flashover voltage, 50% lightning flashover voltage, 50% specified mechanical load and maximum mechanical load. The test results show that the electrical property of the composite insulators are satisfactory, and the pollution flashover voltage and lightning flashover voltage increase with the height of composite insulator structure but are independent on working time. The mechanical property of the composite insulators represent dispersivity, where the mechanical property of early stage composite insulator with wedge structure even descends below the nominal value. It is therefore suggested that attention should be paid to mechanical property of composite insulator, and periodical detection be performed.

关 键 词：复合绝缘子 电气性能 机械性能 

分 类 号：TM216[一般工业技术—材料科学与工程]