高电压技术2018，Vol.44Issue(6)：1822-1827,6.DOI:10.13336/j.1003-6520.hve.20180529013
SF6电气设备中微水对固体绝缘材料闪络电压的影响
Influence of Moisture on Flashover Voltage of Solid Insulating Materials in SF6 Electrical Equipment
摘要
Abstract
Excess moisture in SF6 gas will condense on solid insulating materials under certain conditions and cause the reduction of flashover voltage. Therefore research on the influence of moisture on flashover voltage of solid insulating materials in SF6 will help formulate proper standards of moisture content in SF6 gas. We studied the variation of moisture content with of temperature and its influence on flashover voltages of insulating materials. The results show that moisture hardly affects the flashover voltage of insulating materials at constant ambient temperature. When the ambient temperature changes rapidly, relative humidity in SF6 gas will increase and can even reach 100％. After a sharp change of ambient temperature, moisture within a certain amount have no effect on flashover voltage of insulating materials. When the moisture content reaches a certain value, flashover voltages begin to decrease. The larger the moisture content is, the lower the flashover voltage becomes. And moisture has a more remarkabler influence after a sharp rise of ambient temperature than after a sharp decrease. The range of temperature also has a remarkable influence on the threat caused by moisture, for water vapor is more likely to condense at low temperatures. Moreover, the experimental results show that current standard of moisture content cannot guarantee the normal operation of SF6 electrical equipment. It is suggested that different controlling limits should be used for regions with different climate conditions.关键词
SF6/微水/环境温度/闪络电压/控制标准Key words
SF6/moisture/ambient temperature/flashover voltage/control standard引用本文复制引用
马径坦,张乔根,游浩洋,秦逸帆,文韬,李金忠..SF6电气设备中微水对固体绝缘材料闪络电压的影响[J].高电压技术,2018,44(6):1822-1827,6.基金项目
国家电网公司科技项目(SGAH0000KXJS1401753). Project supported by Science and Technology Project of SGCC(SGAH0000KXJS1401753). （SGAH0000KXJS1401753）
