500kV变电站雷电侵入波过电压的仿真研究

发布时间：2017-12-28 16:07

本文关键词：500kV变电站雷电侵入波过电压的仿真研究　出处：《广西大学》2016年硕士论文　论文类型：学位论文

【摘要】：500kV电网是我国的重要输电网络,而500kV变电站一般为枢纽变电站,有着重要的功能和作用,其既可以作为相邻电力系统之间的联络点,也可以作为下一级电压电力网的主要电源。变电站受到的最大威胁来自于雷电侵害,尤以雷电反击为甚,反击过电压可高达数千千伏,其产生的侵入波入侵变电站会导致严重的设备损坏和财物损失。因此,有必要对雷电侵入波引起的500kV变电站设备过电压进行综合研究。论文主要综述了500kV变电站的发展情况、变电站发生雷害的来源以及雷电侵入波过电压的国内外研究现状,对雷电侵入波过电压的原理进行了理论分析,研究了影响过电压水平的各种因素。另以广西某500kV变电站为例,将变电站和进线段视为一个整体,利用电磁暂态分析软件ATP-EMTP,建立整体仿真计算模型,对雷电侵入波反击引起的变电站设备过电压进行了仿真计算与分析。仿真计算结果表明：变电站的运行方式影响站内各设备过电压的水平,尤以单线路单母线单变压器方式运行时所引起的设备过电压最高；雷击点的不同使得站内各设备的过电压水平也不一样,一般来说雷击点距离变电站入口越远,设备上的过电压越低；杆塔的冲击接地电阻对主变上的过电压幅值影响很大,主变上的过电压幅值随着杆塔冲击接地电阻的增大而增大；主变与避雷器的电气距离将直接影响避雷器对主变的保护效果,电气距离越大,保护效果越差；母线上增装一组避雷器能有效降低设备过电压水平。论文还深入讨论了雷电绕击对设备过电压水平的影响。结果表明,绕击时各设备上的电压幅值远小于它们的雷电冲击绝缘水平,避雷器中的电流远小于避雷器的标称放电电流,站内设备能安全可靠运行。最后,对避雷器的配置方案作了仿真计算,详细分析了各种方案的利弊,提出了安全可靠的防雷保护措施。
[Abstract]:500kV power grid is an important transmission network in China. 500kV substation is generally a hub substation. It has important functions and functions, it can be used as a contact point between adjacent power systems, and also can be used as the main power source of the next level voltage network. The biggest threat is from the substation lightning damage, especially in the lightning counterattack why, back over voltage can be up to several thousand volts, the invasion wave invasion substation will cause equipment damage and serious loss of property. Therefore, it is necessary to make a comprehensive study on the overvoltage of the 500kV substation equipment caused by the lightning invasion wave. This paper mainly reviews the research status of the domestic invasion wave overvoltage source development, substation of 500kV substation lightning and lightning occurs, the principle of wave overvoltage of lightning is analyzed, studied the effect of various factors on voltage level. Taking a 500kV substation in Guangxi as an example, the substation and incoming line are regarded as a whole. The whole simulation calculation model is built by electromagnetic transient analysis software ATP-EMTP, and the overvoltage of substation equipment caused by lightning invasion is simulated and calculated. The simulation results indicate that the influence of station equipment over voltage level operation of the substation, caused by operation especially in single line single bus single transformer when the equipment overvoltage is highest; the different lightning overvoltage level makes the station the equipment is not the same, a general strike point distance substation entrance farther. The equipment over voltage is lower; Tower Impulse Grounding Resistance of voltage transformer on the great influence on the main transformer voltage of tower impulse grounding resistance increases with the increase of electrical distance; the main transformer and arrester will directly affect the protection effect of lightning arrester on main transformer, electrical the distance is, the protection effect is poor; the bus is additionally arranged on a group of arrester equipment can effectively reduce the overvoltage level. The influence of lightning winding on the overvoltage level of equipment is also discussed in this paper. The results show that the amplitude of the voltage on each device is much smaller than the lightning impulse insulation level when they are wound around, the current in the arrester is much smaller than the nominal discharge current of the lightning arrester, and the equipment in the station can run safely and reliably. Finally, the configuration scheme of the lightning arrester is simulated, the advantages and disadvantages of various schemes are analyzed in detail, and a safe and reliable lightning protection measure is put forward.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM63;TM863;TM743

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