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tn–s供电系统中，保护零线需要做几处重复接地，有什么安装方法？

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tn–s供电系统中，保护零线需要做几处重复接地，有什么安装方法？

浏览：42次 | 提问时间： 07-24 10:04

tn–s供电系统中，保护零线需要做几处重复接地

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3个答案

穿过马路 07-24 10:05

三孔插座的上面孔为地线，下面孔为左零右火。一般情况下，单相用电设备，尤其是移动式用电设备，都应使用三芯插头和与之配套的三孔插座。三孔插座上有专用的保护接零插孔，在采用接零保护时，有人经常仅在插座底内将此孔接线柱头与引入插座内的那根零线直接相连，这是非常危险的。因为万一电源的零线断开，或者电源的火线、零线接反，用电器的外壳等金属部分也将带有与电源相同的电压，这就会导致触电。因此，接线时专用接地插孔应与专用的保护地线相连。1、在中性点不接地的供电系统中，必须进行接地保护，而在中性点接地运行的系统中，可采用设备外壳接零保护。但这两种保护方式是不允许同时共用在一个低压电网中的。2、插座在使用单相插座做接零保护时，接线必须正确。单相三孔插座右插孔接火线，左插孔接零线，上插孔接零线保护。但这根零线必须接在零线的干线上，而不能接在左插孔接线端至零线干线之间。3、采用保护接零有如下特点：1）采用保护接零的电气设备，如因绝缘损坏，所产生的“火”对“零”的短路电流要比采用保护接地方式大很多，因而能在较短的时间内促使熔断器或自动空气开关发生动作，迅速切断电源；2）由于零线和火线一般都是并行铺设的，所以采用接零保护时十分安全方便。这样一旦发生零线断线时，火线的电压通过用电设备引至工作零线的左插孔，再由连接线传到设备的外壳上，使碰到设备外壳的人员触电。因此，必须严格按照正确接线方式，安装三孔插座。希望对你有帮助！

王冠之冕 07-24 10:13

总配电箱、分配电箱、开关箱必须要有重复接地;...---在三相五线制供电系统中,把零线的两个作用...

随风飘摇红尘一笑 07-24 10:22

接线方法：1、在中性点不接地的供电系统中，必须进行接地保护，而在中性点接地运行的系统中，可采用设备外壳接零保护。但这两种保护方式是不允许同时共用在一个低压电网中的。2、插座在使用单相插座做接零保护时，接线必须正确。单相三孔插座右插孔接火线，左插孔接零线，上插孔接零线保护。但这根零线必须接在零线的干线上，而不能接在左插孔接线端至零线干线之间。

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