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隔离开关、空气开关、断路器、熔断器的作用是什么?交流空气开关、直流空气开关的区别是什么?
Answer:
(1)隔离开关主要用来隔离高压电源,保证安全检修,并能够通断一定的小电流。 (2)自动空气开关是一种可以用手动或电动分、合闸,而且在电路过负荷或欠电压时能自动分闸的低压开关电器。 (3)断路器又叫高压开关,它是变电所的重要设备之一,它不仅可以切断与闭合高压电路的空载电流和负载电流,而且当系统发生故障时,它和保护装置、自动装置相配合,迅速地切除故障电流,以减少停电范围,防止事故扩大,保证系统安全运行。 (4) 断路器的作用是切断和接通负荷电路,以及切断故障电路,防止事故扩大,保证安全运行。 (5) 两种开关主要区别在灭弧,根据灭弧原理不同,交流开关通过交流电弧过零点时熄弧的原理来切断电弧, 比较容易切断电弧,所以其灭弧装置简单;直流电弧不易切断,故其直流开关灭弧装置的吹弧和绝缘性复杂性要高于交流开关
(
2011-10-25
Time Read:
4145
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