10 kV架空配电线路临近变电站防雷保护措施

建立了10 k V配电线路临近变电站直击雷和感应雷过电压计算模型,提出了临近变电站线路段防雷保护措施,获得了直击雷和感应雷作用下变电站入口过电压的大小,分析了不同措施的防雷性能和对变电站入口过电压的抑制效果。结果表明,安装母线避雷器后,变电站入口过电压幅值可大幅度下降;架设避雷线可有效提高线路的耐雷水平,直击雷和感应雷作用下,变电站入口的过电压峰值可分别下降73%和28%左右。安装绝缘线后,避雷器数量和安装位置对耐雷水平和变电站入口过电压的陡度影响较大,当避雷器安装位置位于绝缘线两端时,对变电站入口过电压的抑制效果较好,可使变电站入口感应过电压峰值下降52%左右。研究可为架空配电线路临近变电站的保护方案设置提供参考。

Analysis of Lightning Protection Measures for 10 kV Overhead Distribution Lines Near the Substation

The direct lightning and induced lightning over-voltage calculation model of 10 kV distribution line near the substation is built. The lightning protection measures of the distribution line near the substation are proposed. The over-voltage in the substation entry under the direct lightning and induced lightning is gotten. The performance of the lightning protection and the over-voltage inhibitory effect in the substation entry are analyzed. Results show that the over-voltage in the substation entry can be reduced greatly after the bus arrester is installed. The lightning withstand levelf of the line can be improved by erecting ground wire. After the ground wire is erected, and the over-voltage peak in the substation entry is reduced by 73% and 28% under the action of direct lightning and induced lightning, respectively. After the insulated line is installed, the quantity and location of the arresters have a big effect on the lightning withstand levelf and the over-voltage gradient in the substation entry. When the arrester is located both ends of the insulated line, the over-voltage inhibitory effect in the substation entry is better and the induced lightning over-voltage peak can be reduced by about 52%. The researches can give a reference to put forward the protection scheme of the overhead distribution line near the substation.