高压断路器断口均压电容器介质损失角增大原因分析及解决措施

笔者通过对高压断路器均压电容器均压原理论述以及损耗的产生和tanδ值易于偏大的原因分析,着重介绍了电容介质材料在交流电压作用下的极化损耗和电导损耗,解析了均压电容器在各种场强下tanδ的变化情况,并提出了降低离子杂质体积分数以改善tanδ增大的解决措施。

Analysis of Grading Capacitor tan8 Expansion for High Voltage Circuit Breaker

This paper analyzes the principle of a grading capacitor in a high voltage circuit breaker,its losses,and the cause of tanδ expansion,giving emphasis on polarization loss and dielectric loss of the dielectric material under alternate voltage.The variation of a grading capacitor tanδ under different field intensities is also analyzed.In addition,a method to suppress tanδ expansion is suggested by reducing ionic contaminations.