220kV单回输电线路过山段雷击电磁暂态计算和耐雷水平研究

【作者】 阮德明；

【导师】 束洪春；

【作者基本信息】 昆明理工大学 ， 电力系统及其自动化， 2012， 硕士

【摘要】 输电线路是电力系统的大动脉,它将巨大的电能输送到四面八方,是连接各电源、各变电站、各负荷的纽带。输电线路的安全运行,直接影响到了电网的稳定和向负荷的可靠供电。因此,输电线路的安全运行在电网中占据举足轻重的地位。输电线路长度大,分布面广,地处旷野,易受雷击。由于线路雷害事故引起的跳闸,导致电力系统的中断供电,增加线路绝缘及开关设备的维修工作量,同时威胁电网的稳定运行,雷击线路时雷电波沿着线路入侵变电站,就是威胁变电站的主要因素及其所引起电量损失的关键。良好的输电线路防雷是减少电力系统雷害事故。本文目的是研究220kV单回输电线路过山段雷击电磁暂态计算和耐雷水平。以220kV福贡—兰坪雪山段送电线路工程116#～120#共5基杆塔(位于杆塔116#～120#之间的线路全长1.038km)为实际背景,本段线路具有高海拔重覆冰的地理气象条件影响的特点。探讨了多种输电线路防雷措施,提出本段线路防雷改造的初步建议,在PSCAD/EMTDC电磁暂态仿真平台下构建本段线路在仅带双避雷线、仅带单耦合地线和既带单避雷线又带单耦合地线这三种不同防雷措施下的精细电磁暂态仿真模型,进行雷直击杆塔及线路档距中央的仿真计算,比较线路耐雷水平。在此基础上,对架设旁路屏蔽地线对提高本段线路耐雷性能的作用进行了理论分析与仿真计算,最后提出了本段线路合理的防雷措施,以对输电线路抗冰防雷起到一定的指导作用。更多还原

【Abstract】 The transmission line is the main artery of the power system. It is a huge power transmission to all directions, connecting the power supply, substations, load, the safe operation of the transmission line, direct influence of the grid stable and reliable power supply to the load. So the safe operation of the transmission line occupies an important position in the grid. The length of the transmission line is large, and wide distribution, is located in the wilderness, easy for lightning stroke. The breaker line due to lightning damage, lead to interrupt of the power supply system, increasing the workload of the switching equipment and line insulation maintenance, and threatening the stable operation of the grid, when lightning line, lightning wave intrusion substations along the line, and the threatening main factors of the substation, caused the key of the power loss. Good transmission line lightning protection is to reduce lightning damage in the power system.The purpose of this thesis is study on lightning withstand level and lightning electromagnetic transient calculation for220kV single circuit transmission line over the mountain section. Base on220kV Fugong-Lanping transmission line across the snow mountain, from tower116#to tower over120#, total tower is five towers (full-length of the line is1.038km), this transmission line is influenced by the heavy ice loading conditions and high altitude geographical environment, and research on variety of transmission line lightning protection, put forward a preliminary proposal of lightning protection, application PSCAD/EMTDC electromagnetic transient simulation platform to build the line in this segment with a dual lightning shielding wires; single lightning shielding wires and coupling ground wire; only single coupling ground wire, the Fine electromagnetic transient simulation model of these three different lightning protection, calculations simulate lightning stroke at the top of tower and mid-span line, and compare lightning withstand level. Based on this, installation of side shielding ground wire to improve lightning protection performance of this line, then calculations simulate and theoretical analysis. Finally, it gave a reasonable lightning protection method for this line, the effects certain indications for anti-ice clinging of transmission lines.更多还原