冲击高压分压器高压臂用卡玛丝温度系数影响因素的研究
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摘要
用于冲击高压分压器高压臂的卡玛丝,需将其均匀密绕于绝缘骨架上,然而,骨架的引入会给卡玛丝的温度系数带来影响。理论和实验证明骨架的热膨胀系数及其几何形状对卡玛丝产生的弯曲应变是改变卡玛丝温度系数的主要影响因素:当骨架的热膨胀系数大于材料本身的热膨胀系数时,温度系数的测量结果会大于电阻丝本身真实的温度系数;弯曲应变会引起K状态结构的破坏,使得电阻值减小。
The Karma resistor,which is used in the high-voltage arm of the high-voltage impulse divider,needs to be uniformly wrapped around the insulating skeleton. However,the introduction of the skeleton will affect the temperature coefficient of Karma resistor. Two dominant factors which affect the temperature coefficient are demonstrated,one is the thermo expansion coefficient of skeleton,the other is the bending strain caused by geometry structure of the skeleton. When the thermal expansion coefficient of the skeleton is larger than that of the material itself,the measurement result of the temperature coefficient will be larger than the true temperature coefficient of the resistance,bending strain will cause the destruction of the K-state structure and make the resistance value decrease.
The Karma resistor,which is used in the high-voltage arm of the high-voltage impulse divider,needs to be uniformly wrapped around the insulating skeleton. However,the introduction of the skeleton will affect the temperature coefficient of Karma resistor. Two dominant factors which affect the temperature coefficient are demonstrated,one is the thermo expansion coefficient of skeleton,the other is the bending strain caused by geometry structure of the skeleton. When the thermal expansion coefficient of the skeleton is larger than that of the material itself,the measurement result of the temperature coefficient will be larger than the true temperature coefficient of the resistance,bending strain will cause the destruction of the K-state structure and make the resistance value decrease.
引文
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[2]包玉树,陈威,王乐仁,等.冲击电压分压器关键计量性能解析(上)[J].电测与仪表,2013,50(2):125-128.
[3]包玉树,李军,朱琦,等.冲击电压分压器关键计量性能解析(下)[J].电测与仪表,2013,50(3):124-128.
[4] Pan Y,Shao H M,Xiao D M,et al. Development of300kV air-insulation standard impulse measurement system[J]. IEEE Transactions on Instrumentation&Measurement,2015,64(6):1627-1635.
[5]袁晟,傅正财,徐真,等.冲击电阻分压器高压臂电阻绕法分析[J].电气自动化,2013,35(4):95-97.
[6]王乐仁,章述汉.电压加法在直流高压分压器电压系数测量中的应用[J].计量学报,2003,24(1):45-48.
[7]李登云,刘高佳,李前,等.高电压下对精密电阻温度系数与电压系数的测量[J].电测与仪表,2012,49(10):20-24.
[8]国家技术监督局. JJG 166-1993直流电阻器检定规程[S].
[9]袁晟.标准冲击分压器电场分布和响应时间研究[D].上海:上海交通大学,2013.
[10]行鹏,苏春强,林国生,等.冲击电阻分压器响应特性的研究[J].高压电器,2011,47(10):26-31.
[11]张煌辉,林飞鹏,邵海明,等.直流高压电阻分压器泄漏电流测量研究[J].计量学报,2018,39(1):83
[12]方澄秋.骨架对电阻温度系数的影响[J].电测与仪表,1980,(12):42-44.