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变电站接地网怎么设计？

变电站接地网怎么设计？

浏览：35次 | 提问时间： 07-29 05:33

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你喜欢就好 07-29 05:34

您好：变电站接地系统的合理与否直接关系到人身和设备安全。在我国,随着电力系统规模的不断扩大,变电站的地质情况复杂,接地系统的设计越来越复杂。变电站接地包含工作接地、保护接地、雷电保护接地。工作接地即为电力系统电气装置中,为运行需要所设的接地;保护接地即为电气装置的。

如果坠落时也有星光 07-29 05:42

要先大面积多点地测量土壤电阻率情况，分析现场的接地可施工区域。考虑当地气候条件把接地体的埋深确定在冻土层以下。一般变电站的接地网要做成边缘闭合的形状，整体规则与否不重要，重点是计算接地电阻值要满足设计要求，还要注意选用材料的热稳定性，验算接触电压和跨步电压，几个条件必须同时满足才可以。对人员的进出通道可以在地网外缘设置帽檐式均压带来降低边缘的跨步电压。

再见不再留你 07-29 05:51

简单说变电站防雷接地设计目的是实现安全的跨步电压和接触电压，实现短路电流入地和防雷接地时的安全接地值，其计算方法相关规范里都有，应收集的*有许多，比如土壤电阻率、可建地网面积、短路电流计算等等等。检测变电站防雷接地主要是检测跨步电压、接触电压值、最重要的一点是检测接地电阻值是否达到规范要求值。变电站的防雷接地主要依据是DL621规范。

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