摘要
利用广东雷电定位系统监测的2000—2008年雷电定位数据,分析广东省近十年雷电时空分布规律特征。通过绘制的历年平均地闪密度变化趋势图和1 km×1 km大小网格的网格法绘制的历年地闪密度图,分析珠三角地区地闪密度变化特征。另外,超过各电压等级输电线路反击耐雷水平的雷电流对电网影响很大,以典型线路耐雷水平为依据,绘制出超过输电线路反击耐雷水平的雷电地闪分布图,分析电网遭受雷击的危险区段。雷电流幅值对防雷评估和防雷策略的制定具有重要意义,根据统计方法分析了珠江三角洲地区及广东省雷电流幅值分布规律的特征,并绘制了超过造成输电线路耐雷水平的落雷分布图,指导不同经济水平层次城市的线路运行部门加强对雷电密集区和密集时段的运行维护,完善落雷密集区内的输电线路绝缘强度参考标准,并为设计部门提供新的线路防雷设计依据。
Based on lightning location data observed by Guangdong lightning location system from 2000 to 2008, this paper analyzes the characteristics of Guangdong Province＇s lightning spatial and temporal distribution in the last decade. By plotting the trends of the average ground flash density over the years and flash density over the years with 1 km × 1 kinsized grid method, the paper also analyzes the flash density variations of the Pearl River Delta region. In addition, lightning current that surpasses transmission lines＇ lightning-resistant level of different voltage levels has a great impact on the power grid. According to the lightning resisting level of typical lines, this paper maps out lightning ground flash that surpasses transmission lines＇ counter-lightning-resistant level to analyze power grid＇s danger zones which are easily struck by lightning. Lightning current amplitude has great significance on the lightning protection assessment and making of the lightning protection strategies. Based on the statistical analysis, the paper analyzes the distribution of lightning current amplitude in the Pearl River Delta region and Guangdong province, and plots the distribution map of the area where the lightening surpasses the lightning-resistant level of power transmission lines, which can be used as a guide for the transmission operators in different cities in their efforts to strengthen the operation and maintenance in lightning-intensive areas and intensive periods, and which also helps to improve the reference standard of the transmission line insulation strength in lightning-intensive areas and serves as a basis for lightning protection designs.
出处
《电网与清洁能源》
2011年第11期13-19,共7页
Power System and Clean Energy
基金
国家重点基础研究发展计划(973计划)~~
关键词
输电线路
雷击跳闸率
防雷评估
珠江三角洲地区
反击耐雷水平
地闪密度
雷电流幅值分布
网格法
transmission line
lightning outage rate
lightning protection assessment
Pearl River Delta region
the level of mineresistant back
flash density
lightning current amplitude distribution
grid method
