什么是接地电阻？施工现场临时用电工程对接地电阻值有什么要求？--杨远锋的博客

什么是接地电阻？施工现场临时用电工程对接地电阻值有什么要求？

[ 2011-8-1 14:33:00 | By: 杨远锋 ]

所谓接地电阻是指接地装置对地电压和流入地中电流的比值。
接地电阻包括接地线电阻、接地体电阻、接地体与土壤间的接触电阻，以及土壤中的散流电阻。由于其中接地线电阻、接地体电阻、接触电阻相对较小，故通常近似以散流电阻作为接地电阻。
在施工现场临时用电工程中，当采用电源中性点直接接地的三相四线制供配电系统和TN—S接零保护系统时，变压器和发电机的工作接地电阻值一般不得大于4Ω；保护线PE每处重复接地电阻值不得大于10Ω；而防雷装置的冲击接地电阻值不得大于30Ω。

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原创

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原创

[ 2016-9-28 16:43:59 | By: 原创(游客) ]

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原创

[ 2016-9-30 11:20:19 | By: 原创(游客) ]

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Re:在漫画中识别身边的违章

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Re:在漫画中识别身边的违章

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