1000kV变电站雷电侵入波防护分析

Analysis of Lightning Invasion Wave Protection for 1000 kV Substation

在特高压防雷保护研究中,除了对雷击特高压输电线路的绝缘子闪络短路停运故障的研究,雷击特高压输电线路进线段时,传入变电站的雷电过电压波对变电站电气设备(特别是变压器)的危害研究也很有必要。这里将考虑绝缘子串参数、杆塔铁架雷电瞬态参数、杆塔冲击接地电阻、线路工频电压、雷击点位置等诸多因素影响,利用ATP-EMTP对1 000 kV变电站的雷电侵入波过电压在变电站电气设备(主要是变压器)上产生的过电压进行精确的计算分析,找出过电压的分布及变化规律,提出相应的雷电过电压保护措施,对电气设备的保护提供有价值的参考依据。该研究思路兼顾安全和经济两方面,可为工程提供新的参考。

In the research of protection against lightning for UHV power system, except for the research on insulator flashover short circuit fault of transmission line caused by lightning stroke, it is necessary to analyze the harm of lightning overvohage wave flooding from the overhead line to the electric apparatus （ especially the transformer） in the substation. Combining in coming lines with a 1000 kV HGIS substation, the lightning invasion wave of 1000 kV substation is investigated via ATP EMTP simulation program with respect to the influences of the parameters of insulator strings, the lightning instantaneous char acteristics of tower, impulse grounding resistance of tower, power frequency voltage and position of lightning stroke. Over voltage generated by lightning invasion wave in the electric apparatus （mainly transformers） is calculated and analyzed accu rately so that the overvoltage distribution and variation can be obtained, and the corresponding overvoltage protection measures against lightning are proposed, which can provide a valuable reference to the protection of electric apparatus. This research takes both safety and economy into account to provide a reference for the lightning overvohage protection of HGIS substations.