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  

Determination the Temperature Coefficient of Karma Resistor Used in the Impulse Divider High Voltage Arm

作　　者：潘洋[1] 周力任[1] 许峰[1] 秦毅[1] 赵叶铭 潘金秋 邵海明[3] PAN Yang;ZHOU Li-ren;XU Feng;QIN Yi;ZHAO Ye-ming;PAN Jin-qiu;SHAO Hai-ming(Shanghai Institute of Measurement and Testing Technology,Shanghai 201203,China;Beijing Information Science and Technology University,Beijing 100192,China;National Institute of Metrology,Beijing 100029,China)

机构地区：[1]上海市计量测试技术研究院,上海201203 [2]北京信息科技大学,北京100192 [3]中国计量科学研究院,北京100029

出　　处：《计量学报》2018年第6期822-825,共4页Acta Metrologica Sinica

基　　金：国家质量监督检验检疫总局项目(2016QK117);北京信息科技大学2017-2018年度"实培计划"项目

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.

关 键 词：计量学 温度系数 卡玛丝 热膨胀 弯曲应变 冲击分压器 

分 类 号：TB942[一般工业技术—计量学]