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隔离开关不完全等同于负荷开关

2013/12/11 10:28:40      点击:

大家会不会有这样的疑问,为什么用了负荷开关还要加隔离开关?这个问题应该不少人碰到过的。

我们说负荷开关是能在正常工作状态下关合和切断负载电流、励磁电流、充电电流和电容器组电流的开关电器。而隔离开关是即在分位置时,触头间有符合规定要求的绝缘距离和明显的断开标志;在合位置时,能承载正;芈诽跫碌牡缌骷霸诠娑ㄊ奔淠谝斐L跫ɡ缍搪罚┫碌牡缌鞯目厣璞。

从结构本身来看:隔离开关本身没有灭弧装置,所以在回路中只是作为隔离元件,在需要检修时将电源和负荷隔离开来。而负荷开关具有灭弧装置,能够断开故障电流,可作为隔离开关使用。负荷开关是独立一体的.和熔断器组合在一起形成组合电器.负荷开关进行正;芈凡僮,而用熔断器来开断回路的短路和故障电流 .

从本身功能来看:隔离开关只起隔离电源的作用,在用负荷开关或断路器切断负荷后才能操作隔离开关。负荷开关要求能切断负荷电流,当它与熔断器组合使用时可用于对变压器的;,当它代替隔离开关使用时,要求有可视窗口,能可视断口的分断情况。

相同点:隔离开关不能带负荷操作,也就是隔离开关不能开通电的情况下进行分合闸,而负荷开关,顾名思义,就是可以带负荷操作,也就是可以在通电的情况先分合闸。

负荷开关和隔离开关无论外形、结构原理、操作方法都很相似。但它们有截然不同之点,按还是必须严格区分,以防操作或者选型方面的错误而引起不必要的麻烦和损失。

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