单台电容器内部故障保护的合理选择

电容器内部故障保护的合理选择是提高电容器装置运行可靠性的重要手段。目前，常常出现因单台电容器内部故障保护选择配置不合理而使电容器组故障扩大的情况，不利于电容器组的安全运行。文中介绍了小电流开断方式和大电流开断方式下的外熔断器的选用原则，内熔丝的保护原理及内熔丝电容器并联元件数的选择原则，还举出了内熔丝和外熔断器电容器的配置实例。

Reasonable Selection of Internal Fault Protection for Single Capacitor

The reasonable selection of internal fault protection for capacitor is the important means to improve operation reliability of capacitor installation. The fault expansion of capacitor bank occurred frequently because of unreasonable selection and disposition of internal fault protection for single capacitor, which was not good for the safe operation of capacitor bank. The paper introduced the selection principle of external fuse under the breaking modes of little current and big current, the principle of internal fuse protection and the selection principle of number of shunt element for internal fuse capacitor, and took the disposition of capacitor with internal fuse or external fuse as an example.