【摘要】 随着特高压输电技术的广泛应用,如何降低特高压工程的建设投资成本以提高特高压工程的经济性,已成为特高压技术发展面临的重要问题之一。通过对"皖电东送"同塔多回特高压工程4个变电站的雷电侵入波过电压进行计算和分析,对母线是否可以不装避雷器(MOA)的问题进行了研究。计算仿真结果表明,如果母线不安装避雷器,变电站在正常运行方式下,站内设备上最大雷电侵入波幅值为1 995kV,过电压值均在允许值范围之内;而在特殊运行方式下,站内设备上最大雷电侵入波幅值为2 480kV,超过了绝缘裕度允许的范围。然而,特殊的运行方式可以通过预先确立调度规程予以规避,因此可认为,"皖电东送"工程沿线的4个特高压气体绝缘变电站(GIS)母线可以不装避雷器。此措施可以使4个变电站站节省约1.2亿元(约1 500万元每组)的建设投资,具有明显的经济效益。更多还原

【Abstract】 Reducing the construction cost of ultra high voltage(UHV) project to improve its economy has become one of the most important problems in the development of UHV technology.We calculated and analyzed the incoming lightning surges of 4 substations of the Huainan-Shanghai UHV transmission project to study the feasibility and security of canceling the metal oxide arresters MOAs at busbar.The results show that,in the absence of MOAs,the maximum lightning incoming overvoltage at all devices is 1 995 kV under normal operation mode which is within the permitted range.However,the maximum lightning incoming overvoltage is 2 480 kV under special operation mode which exceeds the permitted range.Considering that the special operation mode,i.e.,the particular wiring configuration can be avoided by scheduling the sequence of grid-combine operations in advance,it can be concluded that the metal oxide arresters MOAs at busbar can be canceled in the 4 UHV gas insulated switchgear(GIS)substation.The cancellation is significantly economical by saving about 120 million RMB(15 million RMB per set) investments for the 4 substations of the Huainan-Shanghai transmission project in total.更多还原