电流型电子式电压互感器的温度稳定性研究
发布时间：2018-09-06 13:45
【摘要】：针对一种电流型电子式电压互感器(EVT)的温度稳定性进行了分析,指出高压电容器和一次侧信号处理单元中的积分电路是影响其温度稳定性的主要环节.设计了利用正、负温度系数数值相等的多个电容单元串联组成高压电容器的温度补偿方案,有效地改善了高压传感部分的温度稳定性;提出利用热敏电阻对积分电容的温度特性进行补偿的方法,减小了温度变化给积分电路带来的误差.依照IEC60044-7的要求,对研制的110kV电流型EVT样机进行了温度影响准确度试验,试验结果表明设计的温度补偿方案有效,互感器在-40℃~+70℃温度范围内,满足0.2级测量准确度要求.
[Abstract]:The temperature stability of a current-mode electronic voltage transformer (EVT) is analyzed. It is pointed out that the integration circuit in the high-voltage capacitor and the primary side signal processing unit is the main link affecting its temperature stability. The temperature compensation scheme of high voltage capacitor composed of several capacitor units with equal positive and negative temperature coefficients in series is designed, which can effectively improve the temperature stability of the high voltage sensing part. A method of compensating the temperature characteristics of the integral capacitance by using thermistor is presented, which reduces the error caused by the temperature change. According to the requirements of IEC60044-7, the temperature effect accuracy test of the 110kV current-mode EVT prototype is carried out. The experimental results show that the designed temperature compensation scheme is effective, and the transformer meets the requirement of 0.2-grade accuracy in the temperature range of -40 鈩，
本文编号：2226527
[Abstract]:The temperature stability of a current-mode electronic voltage transformer (EVT) is analyzed. It is pointed out that the integration circuit in the high-voltage capacitor and the primary side signal processing unit is the main link affecting its temperature stability. The temperature compensation scheme of high voltage capacitor composed of several capacitor units with equal positive and negative temperature coefficients in series is designed, which can effectively improve the temperature stability of the high voltage sensing part. A method of compensating the temperature characteristics of the integral capacitance by using thermistor is presented, which reduces the error caused by the temperature change. According to the requirements of IEC60044-7, the temperature effect accuracy test of the 110kV current-mode EVT prototype is carried out. The experimental results show that the designed temperature compensation scheme is effective, and the transformer meets the requirement of 0.2-grade accuracy in the temperature range of -40 鈩，
本文编号：2226527
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