电容式电压互感器元件耐压试验研究

随着电容式电压互感器（CVT）在电力系统中的广泛使用,运行中也出现了一些问题,其中较常见的是内部电容元件的击穿故障,虽然CVT电容元件的绝缘裕度较高,然而元件的耐压特性以及击穿一定个数元件后对整体CVT安全性能的影响尚无人进行试验研究,本文对整台或单节分压器电容进行了元件击穿及整体耐压试验研究,并验证了元件击穿到一定数量后是否会导致整体贯穿性击穿,得到了适用于CVT在线监测系统的判断阈值.

Study on Withstand Voltage Test of Capacitor Voltage Transformer Element

With the wide use of Capacitor voltage transformer（CVT） in power system, some problems occurs in the operation, in which the common one is breakdown fault of internal capacitor element. Although CVT capacitor element has high dielectric margin, yet the withstand voltage fature of the element and influence of definite number of brokendown elements on safety of complete CVT are not tested and studied. In this paper, the element breakdown and integrated withstand voltage test and study for complete set or single voltage divider＇ s capacitance is performed, whether existance of complete breakdown after breakdown of a certain number of capacitance components is verified and probable threshold applicable for CVT on-line monitoring system is obtained.