1000 kV特高压交流紧凑型输电线路综合工况下间隔棒抑制效果仿真研究  

Simulation Research on the Suppression Effect of Spacers on 1 000 kV UHV AC Compact Transmission Lines Under Comprehensive Conditions

作　　者：王黎明[1] 曹露 梅红伟[1] 赵晨龙[1] 高亚云[1] 

机构地区：[1]清华大学深圳研究生院,深圳518055 [2]国网上海市电力公司浦东供电公司,上海200120

出　　处：《高电压技术》2017年第11期3661-3667,共7页High Voltage Engineering

基　　金：国家自然科学基金(51377093)~~

摘　　要：与常规线路相比,紧凑型输电线路的相间空气绝缘距离大大减小,在实际运行过程中遭遇诸如大风、脱冰等外力影响时更容易发生相间闪络、碰线事故。为此,针对1 000 kV特高压交流紧凑型输电线路,主要研究了大风和C相脱冰综合工况下传统相间间隔棒与新型相地间隔棒对相导线不同期摆动的抑制效果。根据清华大学自主研发的非线性导线–绝缘子体系3自由度多档模型,首先研究了大风和脱冰发生时间间隔的影响,然后研究了大风起风和脱冰同时发生时不同间隔棒配置方案的效果。计算结果表明:大风起始时间与脱冰时间一致时对导线相间距离影响最恶劣;在C相中点安装结构高度为14 m、芯棒直径为75 mm的相地间隔棒,且在A–B相间、档距1/4、1/2、3/4处安装3支结构高度为14 m、芯棒直径为30 mm的相间间隔棒,可将线路安全运行档距提升至1 000 m;对于1 000 m以上大档距线路,建议将相间距离增大至18 m,利用上述间隔棒配置方案即可在一定程度上实现1 500 m档距以内的安全运行;运行过程中绝缘子所受拉、压力均在其受力范围内,且具有较大的裕度。综上所述,对于紧凑型线路,在大风和脱冰综合工况下,建议采用较大直径的相间间隔棒和相地间隔棒相结合的方案进行有效的相间距离控制;对于更大档距线路,需结合增大相间距离的方式方可保证安全的相间距离。The air insulation clearance between phases of compact transmission lines is greatly reduced compared to normal transmission line. Therefore, when it encounters external forces, such as ice-shedding and wind, flashover and line collision accident can happen. We studied the conduqtor suppression effect of traditional inter-phase spacer and new phase-to-earth spacer under the comprehensive conditions of strong wind and C-phase ice-shedding for 1 000 kV UHV AC compact transmission lines. Based on the nonlinear three-degree-freedom （3DOF） simulation model established by Tsinghua University, the time interval between wind and ice-shedding was studied. When the wind blows simultanenously with ice-shedding, it has the worst influence on air clearance between phases. The conductor suppression effect of differ- ent spacer configuration schemes is investigated under the combined conditions of strong wind and ice-shedding. The simulation result shows that it has effective control on the air clearance with span under 1 000 m to apply new phase-to-earth spacer with a height of 14 m and a diameter of 75 mm on C-phase, and three inter-phase spacers with a height of 14 m and a diameter of 30 mm on the place of 1/4,1/2 and 3/4 of A-B phases, respectively. For transmission lines of over 1 000 m span, it is suggested to enlarge the air clearance between phases to 18 m and use spacer configura- tion scheme above-mentioned. In this way, transmission lines can operate safely with span under 1 500 m. During dynamic operation, the tension and pressure of the insulator are within the safety range, and have great margins. In con- clusion, for the compact transmission lines under comprehensive conditions of strong wind and ice-shedding, the method of combining large diameter inter-phase spacers with phase-to-earth spacers is recommended for effective air clearance control. For the transmission lines of larger span, it is necessary to combine the method of increasing the distance between phases to ensure safe air clearance between phase

关 键 词：1 000 KV 紧凑型输电线路 大风 脱冰 相间间隔棒 相地间隔棒 

分 类 号：TM75[电气工程—电力系统及自动化]