输电线路毕业设计说明书-1000kV输电线路防雷性能分析.doc

某1000kV输电线路防雷性能分析 摘 要：到目前为止，雷击仍然是造成线路跳闸停电事故的主要原因，也是变电站侵入波的来源。而随着电压等级提高，线路上传统的避雷线防护作用失效而导致绕击的影响也越来越大，因此我国正在建设的1000kV晋东南一南阳一荆门单回输电示范工程中，已将绕击防护作为线路防雷保护的主要工作。因此，准确计算输电线路的耐雷水平和跳闸率对保证特高压输电系统安全运行显得尤为重要。本文首先对反击耐雷性能理论进行分析。运用规程法计算反击跳闸率，并且进行性能分析。然后对绕击耐雷性能进行分析。运用考虑工作电压的改进电气几何模型对输电线路绕击性能进行了分析，着重分析工作电压对绝缘子伏秒特性的影响，采用击矩法计算绕击跳闸率。接着对特高压输电系统耐雷性能及影响因素进行研究，最后给出相关限制措施。因此论文研究结果将为提高晋东南一南阳一荆门1000kV特高压输电线路耐雷性能提供理论依据和数据，并为同类型线路提供参考。 关键词：雷击，特高压交流输电，耐雷性能，绕击跳闸率，反击跳闸率 Abstract:Up to now,lighting striking 15 still main damage of Power transmission line,is main reason of making line tripping and outage.Meanwhile,lighting surge wave,which introduced by lightning stroking to transmission line,invading into substation over the line also is the key factor Which impacts on the safe operation of the substation equipment.The UHV transmission project of Jindongnan-nanyang nanyang-Jingmen of our country which is under construction,regards round-strike protection as main work of power transmission line protection.so accurately calculate lightning withstand level and lightning trip-out rate is much important to ensure the secure and stable operation of power system.at first,the lightning withstand performances of back striking is described in this paper. Application of regulation method to calculate the counterattack trip-out rate, and performance analysis.And then the theory of the lightning withstand performances of shielding failure .The theoretical analysis of the lightning withstand performances for shielding failure back,using the improved EGM which could take the effect of AC operating voltage into account,mainly analyze the influence of AC operating voltage to V-S characteristics of insulator,and calculate round-strike switching rate with strike moment method,use Click the moment method count The shielding failure rate.Carry on study the lightning protection performance and influence factors of UHV transmission system, finally gives the relevant restrictions. Therefore, the research results will pro