傅文韬

(国网湖南省电力公司汨罗市供电分公司，湖南 汨罗　414400)



500 kV HGIS变电站防雷保护配置研究

傅文韬

(国网湖南省电力公司汨罗市供电分公司，湖南 汨罗414400)

摘要：500 kV HGIS变电站在结构上和GIS变电站不同，站内电气设备的雷击过电压水平也会不同。因此，需要对500 kV HGIS变电站进行雷电侵入波过电压研究，以确保在雷电波侵入时，站内电气设备上的电压水平不超过其绝缘水平。以某500 kV HGIS变电站为例，考虑了多种运行方式、线路高抗、线路电晕等影响因素，采用国际上通用的仿真计算程序EMTP，建立了该变电站的雷击过电压仿真模型；并对不同运行方式下，该变电站雷电侵入波过电压水平进行了分析计算。根据仿真结果，提出了可能的雷击过电压保护方案,具有实际工程参考价值。

关键词：HGIS变电站；防雷保护；EMTP；避雷器

Abstract：The HGIS substation and GIS substation of 500 kV level are different in structure, and the lightning over-voltage level of their electrical apparatus is also different. So it is necessary to study the lightning over-voltage in 500 kV HGIS substation in order to ensure that the electrical apparatus will keep the voltage level in normal range under any operating modes during the lightning wave intrusion. Taking a 500 kV HGIS substation for example and taking the various influencing factors into account, including operating modes, line reactor and line corona, the simulation model of lightning over-voltage of the substation is established using electromagnetic transient program (EMTP) as simulation tool, and the lightning over-voltage level of the substation is analyzed and calculated in various operating modes. Based on simulation results, a possible protection scheme against lightning over-voltage is proposed, which has a reference value for practical engineering.

Key words：HGIS substation; protection against lightning; EMTP; lightning arrester

0引言

雷电过电压是影响超高压输电网络正常运行的重要因素之一。一旦发生雷害事故，将直接影响系统的安全可靠运行，造成严重的后果[1]。目前，500 kV电压等级的变电站有3种类型：500 kV GIS、500 kV AIS、500 kV HGIS。变电站设备的雷电过电压情况与变电站结构紧密相关，不同类型的变电站，防雷保护配置情况也不一样。

对于500 kV GIS变电站：1)GIS套管的波阻抗远小于架空线的波阻抗；2)雷电流从架空线进入GIS反射波的极性与入射波极性相反；3)GIS变电站各设备的电气距离较短，有利于整个变电站的防雷保护。对于500 kV GIS变电站防雷保护配置，往往采用在线路靠CVT侧和主变压器侧各安装1组避雷器以及母线和高压电抗器回路不安装避雷器的配置方案[2-3]。……