为提高安徽省电网防雷安全性,提出了雷电预警系统设计方案.系统综合雷电实况、卫星云图、大气电场等综合预警信息,根据电力用户需求,设计了数据前置处理、天气预报传输、输电线路雷电预警查看、周边预警、短信与微信推送等功能.系统可实现对一段时间内遭受雷击的输电通道及线路区域高风险区段发出警报.通过调度、运行、维护检修、应急等联动的主动性动态防护措施,将雷电造成的停电损失和人员伤害降到最低,从而提高电网雷害主动性防御水平.

220 kV输电线路跳闸对电网供电可靠性影响较大,这其中雷击引起的占较大比例,分析认为绕击是安徽电网220 kV输电线路雷击跳闸的主要原因,避雷线保护角、杆塔高度、地形、杆塔型式等对绕击都有影响.文章还对雷击发生的时间、雷电定位系统使用、重合闸成功率进行了分析.

In order to instruct more scientific and effective lightning protection methods, a targeted comprehensive strategy for lightning protection from surface to line to point by synthesizing operating experience, lightning zones map, lightning risk assessment, and treatment technology is proposed based on the practical management demand and differentiation idea of lightning protection. The strategy is applied to the Anhui power grid. Firstly, the characteristics of historical lightning faults are summarized; secondly, the lightning zones maps in the overall province and along transmission lines are plotted to determine regions with strong lightning activities; thirdly, according to the lightning risk assessment and the treatment technology, the risk grades as well as its determination for typical transmission lines are evaluated, and several reform schemes are made with their technology and economy as definitely given. The related results have been applied to the lightning protection work in the Anhui power grid.

In order to fully understand the characteristics of lightning activity and thereby supply important reference for plan and construction of the Anhui Grid as well as lightning protection design, massive detection data from 2005 to 2009 gained by Anhui Lightning Detection Network are statistically analyzed by the grid method in this paper. The time and space distribution of lightning activity and distribution of cloud-ground flashes current amplitude in Anhui province are presented. On the basis of the results, the lightning performance of shielding failure of a typical transmission line is studied with lightning parameters recommended by regular method compared with that with statistical lightning parameters. The results show that the lightning activity in Anhui province mainly happens in south-east areas. In addition, the statistical ground flash density is higher than that recommended by regular method and the median current of the cumulative probability fitting expression obtained in this paper is lower than that of the fitting expression format adopted by IEEE. The shielding failure rates calculated with statistical lightning can better meet the operational experience.

The positioning and monitoring principles,main functions,and technical indices of the lightning monitoring system for Anhui Power Grid were presented.Based on large amount of lightning information obtained,the fundamental data and practical method for guiding anti-lightning design,technical retrofits,and operation were achieved.

500kV输电线路零序阻抗受线路结构、运行方式、干扰电压、地质情况等因素的影响,其测量结果会产生误差,具体分析了零序阻抗原理、不同运行方式下零序阻抗实测的方法和理论分析,并结合实际研究了几条500kV输电线路零序参数,提出了在实测和计算中注意的问题,提高实测数值的准确性。

With the effect of line structure, interference source and geologic distribution, the zero sequence impedance of the 500kV transmission line varies greatly. This paper analyzes the zero sequence impedance of several 500kV transmission lines and analyzes the theory and methods of measurement in detail. Meanwhile, it puts forward some problems that should be paid attention to during the process of measurement and calculation.

According to the phenomenon of resonance occurred in 500 kV long distance compact transmission line under some operation modes in Anhui Power Grid, due to the disposition of shunt and neutral reactor, the paper introduced a kind of software to adopt EMTP electromagnetic transient calculation. The over-voltage calculation and analysis of the basic operating conditions under the start-up mode and the conventional condition after putting into service were carried out, which can reach to change the start-up mode and play the role of completing safety start of line.

利用雷电定位系统(LLS)分析2002、2003年安徽电网500 kV输电线路雷击跳闸后,得出绕击是500 kV输电线路雷击跳闸的主要原因.提高线路绝缘水平、减小避雷线保护角及杆塔接地电阻等措施是线路防雷工作的重要措施,LLS对于雷击故障点的查找、事故分析都有重要指导作用.

介绍了一次220 kV氧化锌避雷器(MOA)红外测温异常的处理,通过对异常MOA的带电检测、停电试验、解体检查的分析,指出红外测温、阻性电流测量可及时准确发现MOA受潮故障.

1996 年 8 月安徽省电力试验研究所与武汉高压研究所联合研制开发了利用 GPS 卫星定位技术的安徽省雷电定位系统.1999 年 6 月在此基础上又开发出了雷电定位系统拨号查询终端,并举办了全省电力系统的推广应用工作会.铜陵供电局在派有关人员参加此次会议后,于 1999 年 8 月在铜陵供电局成功地安装了安徽省雷电定位系统拨号查询终端.利用此终端,可以在铜陵供电局内实时地接收、查询、显示、重放雷电数据,并快速地查找雷击点,掌握雷电活动情况.