操作冲击电压累积作用对油纸绝缘性能影响的研究  

Effect of Accumulative Switching Impulses on Oil-paper Insulation

作　　者：司马文霞[1] 陆琛[1] 杨庆[1] 袁涛[1] 孙魄韬 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044

出　　处：《高压电器》2015年第9期1-8,共8页High Voltage Apparatus

基　　金：国家重点基础研究发展计划(973项目)(2009CB724504)~~

摘　　要：过电压对于油纸绝缘的性能影响的研究目前主要集中在油纸绝缘在冲击电压作用下的U-N特性方面,而对于油纸绝缘在冲击电压作用下的物理化学特性的变化方面的研究比较少,并且研究主要集中在雷电冲击方面,对于操作冲击电压的影响规律的研究却比较少。因此,文中对操作冲击电压累积作用下油纸绝缘的电气特性和机械性能变化进行了研究,研究发现：在承受操作过电压的累积冲击之后,油纸绝缘的直流体积电导率呈上升趋势;油纸绝缘的介电特性和交流电导率在10-2~100Hz频域内呈上升趋势,而在100~107Hz的范围内基本保持不变;其介质损耗角正切值在10-2~103Hz频域内呈上升趋势,而在103~107Hz范围内基本保持不变;就其在工频50 Hz频率下的电气特性而言,油纸绝缘的介电常数、体积电导率、击穿电压变化均不大,局部放电起始电压以及局部放电截止电压呈下降趋势,但是其介质损耗则会上升;同时,操作冲击电压的累积作用会使得绝缘纸的聚合度轻微下降,但对于油纸绝缘的抗拉强度则影响不大。Current researches on the effect of overvoltage on oil-paper insulation focus on the voltage-num- ber（U-N） characteristic of oil-paper insulation under impulse voltage. However, the researches about the change of physical and chemical characteristics of oil-paper insulation under accumulative effect of impulse voltage are insufficient and with emphasis on the effect of lightening impulse. In this study, the changes of electrical and mechanical characteristics of oil-paper insulation under accumulative effect of switching im- pulses are investigated. The results show that： 1）The DC conductivity of the oil-paper insulation samples increases under accumulative effect of switching impulse; 2）The dielectric characteristic and conductivity of the oil-paper insulation samples increase in 10-2-10o Hz and keep steady inl0~~107 Hz; 3）The dielectric loss factor of the oil-paper insulation samples increases in 10-2-103 Hz and keeps steady in 103--107 Hz; 4）For the electrical characteristics of the oil-paper insulation at power frequency, the dielectric characteristic, conductivity and the breakdown voltage keep steady, but the inception and extinction vohages of par- tial discharge decrease, while the dielectric loss factor increases; 5）The degree of polymerization of the oil-paper insulation decreases slightly while its tensile strength keeps steady under the accumulative effect of switching impulses

关 键 词：操作冲击电压 油纸绝缘 累积作用 电气特性 聚合度 抗拉强度 

分 类 号：TM406[电气工程—电器]