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高压电器  2015 

35 kV并网光伏电站低电压穿越检测装置的绝缘配合优化设计

DOI: 10.13296/j.1001-1609.hva.2015.10.002, PP. 8-12

Keywords: 低电压穿越测试装置,绝缘配合,电场计算,干式空心电抗器,操作过电压

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Abstract:

为了避免35kV并网光伏低穿检测装置在高海拔环境运行过程中发生装置内电抗器抽头对周围零电位或抽头间放电等绝缘击穿事故,文中结合产品设计过程中操作过电压测量实验,利用有限元法对低压穿越检测装置在运行过程中耐受高幅值操作过电压条件下的电场分布进行仿真计算,分析了装置内绝缘薄弱区域并提出优化建议。结果表明在抽头间安装绝缘挡板、增大抽头处螺母表面积、提高接线铜排的曲率及抽头之间的电气间隙等措施可以使装置内原本畸变电场分布更加均匀,最大场强值降低57.2%。

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