品牌:Parker | 规格:Parker 6K8 8-Axis | 材质:Parker 6K8 8-Axis |
产地:美国 |
Parker 6K8 8-Axis
Parker 6K8 8-Axis
Parker 6K8 8-Axis
在接地故障回路全为金属导体的TN-C-S系统,其导电性能不良失去接地保护并不影响电气设备的使用,故工作中不易发现。但一旦发生接地故障,由于短路电流小,不能使断路器动作,而导致上述电弧性短路的发生。至于TT系统,其接地故障回路内串有电源的接地保护和设备外壳的接地保护,两个接地电阻造成回路本身的阻抗就很大,更易发生电弧性短路。由上可知,接地故障的回路阻抗大,使它易以电弧短路的形式出现,这也是单相接地短路故障容易导致火灾的一个重要原因。
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