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风电场雷电反击暂态计算与分析

DOI: 10.16188/j.isa.1003-8337.2015.06.027, PP. 136-141

Keywords: 风电机组,箱式变压器,雷电反击,地电位升高,SPD,避雷器,吸收能量

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Abstract:

根据对某风电场雷害事故的现场调研,风电机组塔外箱式变压器(简称箱变)遭雷电反击损坏严重影响了风电场的安全稳定运行,本文结合风电场实际情况,利用ATP/EMTP仿真软件建立了风机-箱变系统雷电暂态模型,对雷电反击过程进行了仿真计算,分析了接地网冲击接地电阻、风机与箱变电气距离、SPD配置方式对箱变低压侧电位差、流过避雷器电流和避雷器吸收能量的影响。计算结果表明:降低接地网冲击接地电阻,在箱变低压侧加装SPD可以起到不错的防雷效果;对于高土壤电阻率地区风电场,建议在设计时适当增大风机与箱变间电气距离;选用5kA标称放电电流的避雷器耐受塔顶雷击水平约为80kA,在强雷区应选用更大通流容量的避雷器。

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