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考虑接触电压的风电机组接地网优化设计

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Keywords: 接地网,风电机组,接触电压,不等间距地网,短垂直接地极

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Abstract:

为确保风电场电气设备和工作人员人身安全,接地设计需要有合格的接地电阻值、接触电压和跨步电压值。在接地电阻满足安全值的情况下,如果接地设计不合理,地面上还是可能产生超过允许值的接触电压和跨步电压。降低接触和跨步电压的一般方法是增设水平接地网和在地表铺设高阻率土壤层,但风电机组所处自然环境特殊,受地形限制,不易过多扩大接地网面积。在不增加接地网总长度的情况下采用不等间距法布置地网导体,或者改变地基与接地网的相对位置可显著降低地表最大接触电压,提高地网安全水平。在接地网边角放置短垂直接地极也可在一定程度上减小最大接触电压。地网与地基相对位置的改变也会影响接触电压值。针对这种情况,用CDEGS软件对风电机组的接地网进行仿真分析,提出了一种风电机组接地网的优化设计。

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