【摘要】：針對一種電流型電子式電壓互感器(EVT)的溫度穩(wěn)定性進(jìn)行了分析,指出高壓電容器和一次側(cè)信號處理單元中的積分電路是影響其溫度穩(wěn)定性的主要環(huán)節(jié).設(shè)計了利用正、負(fù)溫度系數(shù)數(shù)值相等的多個電容單元串聯(lián)組成高壓電容器的溫度補償方案,有效地改善了高壓傳感部分的溫度穩(wěn)定性;提出利用熱敏電阻對積分電容的溫度特性進(jìn)行補償?shù)姆椒?減小了溫度變化給積分電路帶來的誤差.依照IEC60044-7的要求,對研制的110kV電流型EVT樣機進(jìn)行了溫度影響準(zhǔn)確度試驗,試驗結(jié)果表明設(shè)計的溫度補償方案有效,互感器在-40℃~+70℃溫度范圍內(nèi),滿足0.2級測量準(zhǔn)確度要求.
[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，

本文編號：2226527