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厦门仲鑫航电气有限公司

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PM861K01
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产 品: PM861K01 
型 号: PM861K01 
规 格: PM861K01 
品 牌: ABB 
单 价: 1.00元/件 
最小起订量: 1 件 
供货总量: 99 件
发货期限: 自买家付款之日起 3 天内发货
更新日期: 2015-01-12  有效期至:长期有效
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PM861K01

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。

  电力线路受机械损伤而发生短路,如当导线与金属管道构件接触而无套管保护时,长期磨擦使绝缘损坏,这种短路多为单相接地故障造成,易发生电弧性短路。通常电气设备绝缘损坏产生电弧性接地故障的情况还有:导线和电气设备绝缘老化;电器或电动机的接线端子周围绝缘因长期发热而炭化;电动机过载而发生匝间短路;电气设备受潮或严重凝露;在电气设备中有导电尘埃沉积等。这类故障会引起接地电弧性短路,并酿成火灾。

厦门仲鑫达自动化设备有限公司
contact: 张芳
Tel: +86-0592-5087951    +86-18030132582
Fax: +86-0592-5165561(传真注明张芳收,谢谢!)
QQ: 1463656238   2261069910   2726940511
mail:1463656238@qq.com
地址:厦门市思明区湖滨东路湖光大厦8楼A

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  • 联系人:张芳(女士)
  • 职位:
  • 电话:0592-5087951
  • 手机:18030132582
  • 传真:0592-5165561
  • 地址:福建省厦门市思明区湖滨东路湖光大厦18楼A座
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