长期以来，继电保护设备的维修方式是按以定期性检验为主，事后维修为辅的原则而进行的。

For a long time, the maintenance mode of relay protection equipments is based on the principle of mainly periodical inspection, supplemented by break maintenance.

youdao

长期以来，继电保护设备的维修方式是按以定期性检验为主，事后维修为辅的原则而进行的。

For a long time, the maintenance mode of relay protection equipments is based on the principle of mainly periodical inspection, supplemented by break maintenance.

youdao