40.5 kV开关柜母线套管受潮后绝缘性能试验研究  

Study on Insualtion Performance Test of Bus Bushing of 40.5 kV Switchgear Cabinet After Moisture

作　　者：张威 文雅钦 吴传奇 李劲彬 李卫东 张进 ZHANG Wei;WEN Yaqin;WU Chuanqi;LI Jinbin;LI Weidong;ZHANG Jin(Yichang Power Supply Company,State Grid Hubei Electric Power Co.,Ltd.,Hubei Yichang 443000,China;State Grid Hubei Electric Power Research Institute,Wuhan 430077,China)

机构地区：[1]国网湖北省电力有限公司宜昌供电公司,湖北宜昌443000 [2]国网湖北省电力有限公司电力科学研究院,武汉430077

出　　处：《高压电器》2024年第5期214-219,228,共7页High Voltage Apparatus

摘　　要：开关柜绝缘件在湿热环境中长时间运行易出现受潮使绝缘性能下降,进而导致柜内出现局部放电和闪络故障,严重影响设备的稳定运行。文中针对一起典型的40.5 kV开关柜母线套管受潮后局部放电故障,对受损程度不同的母线套管开展绝缘性能试验研究,比较了绝缘件烘烤试验前后的电气性能和材料性能。试验结果表明:局部放电量、绝缘电阻、玻璃化转变温度均能反映套管的受潮程度,该套管烘干后的绝缘电阻由MΩ量级增至100 GΩ量级,局部放电量显著降低,材料的玻璃化转变温度降低,且不同试样因受潮的程度增加而增大;放电烧损的套管其绝缘性能受损,局部放电量已不能反映受潮程度,但绝缘电阻、玻璃化转变温度能反映其受潮程度。该结果可以为开关柜绝缘件受潮故障分析和诊断提供支撑,进一步证明了开关柜除湿、局部放电检测对提高开关柜运行可靠的重要性。The long-term operation of insulating part of switchgear cabinet in the humid and hot environment is prone to moisture and reduction of insulation performance,leading to partial discharge and flashover inside the switchgear cabinet and effecting seriously stable operation of the equipment.Aiming at a typical partial discharge fault of bus bushing of 40.5 kV switchgear cabinet after moisture,the insulation performance test of bus bushing with different damage degrees is performed,and the electrical and material properties of the insulating parts before and after baking test are compared.The test results show that the partial discharge,insulation resistance and glass transition temperature can reflect the moisture degree of the bushing.The insulation resistance of the bushing after drying increases from the order of MΩto 100 GΩ,the partial discharge decreases significantly,the glass transition temperature of the material decreases and different samples increase with the increase of moisture degree.The insulation performance of the bushing burned by discharge is damaged,and the degree of moisture can not be reflected by the partial discharge but by the insulation resistance and glass transition temperature.The results can provide support for the moisture analysis and diagnosis of the insualtion parts of the switchgear cabinet,and further prove the importance of dehumidification and partial discharge detection of switchgear cabinet to improve the reliable operation of switchgear cabinet.

关 键 词：开关柜 母线套管 受潮 局部放电 玻璃化转变温度 

分 类 号：TM591[电气工程—电器]