论文部分内容阅读
矿井低压过流保护(短路保护、过负荷保护和断相保护)是矿井低压供电三大保护之一,它对保障矿井低压供电的安全具有十分重要作用。目前通常采用 DW 系列隔爆型自动馈电开关做为变压器二次侧或配出线路的短路保护。众所周知,该开关中装有一种直接动作的一次式过电流瞬时动作继电器,动作电流值的整定是通过调整过电流继电器可动衔铁弹簧拉力的大小进行的。过流整定值的选择通常按照《矿井低压电网短路保
Low pressure overcurrent protection (short circuit protection, overload protection and phase failure protection) is one of the three major protection measures for mine low voltage power supply. It plays an important role in ensuring the safety of mine low voltage power supply. At present, it is usually used DW Series Flameproof automatic feed switch as the secondary side of the transformer or distribution line short circuit protection. As we all know, the switch is equipped with a direct action of the one-time over-current instantaneous action relay, the action current value is set by adjusting the over-current relay movable armature spring pull size. The choice of overcurrent setting is usually in accordance with "mine low-voltage power grid short circuit protection