特高压倒V型串杆塔间隙放电特性及绝缘配置分析
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摘要
为得到特高压同塔双回线路新型倒V串杆塔间隙绝缘配置,建立了特高压双回倒V串全尺寸试验塔头,开展了倒V串高压电极对杆塔构架不同间隙距离下的放电特性试验研究,获得了工频电压、1 000μs长波前冲击电压和雷电冲击全电压类型放电特性曲线。结果表明对于3种电压类型,下相间隙50%放电电压梯度均高于中相间隙,其中,下相间隙1 000μs波前操作冲击放电电压梯度较中相间隙高4.6%。结合特高压交流系统电压特点,提出了海拔1 000 m条件下特高压同塔双回线路倒V串间隙配置推荐值,工频电压控制间隙取2.9 m,操作过电压控制间隙取6.5 m,平原和山区雷电防护间隙分别取6.7 m、7.2 m。
In order to get a configuration of inverse V-type insulator tower air-gaps of double-circuit UHV AC power transmission lines, we experimentally investigated different distance air-gaps from high-voltage electrode to tower frame flashover of inverse V-type insulator. Meanwhile, we obtained the flashover characteristics curves of power frequency voltage, 1 000 μs long wave-front switching impulse voltage, and lightning impulse of UHV AC double-circuit tower. Results show that the 50% flashover voltage gradient of bottom phase air-gaps is higher than that of middle phase. The 50% flashover voltage gradient of 1 000 μs wave-front switching impulse of bottom phase air-gaps is 4.6% higher than that of the middle phase. Based on the test results and the characteristics of operating voltage and over-voltage of UHV AC power transmission system, the UHV AC double-circuit tower inverse V-type insulator air-gaps configuration is proposed. The air-gaps configuration of power frequency voltage and switching overvoltage are 2.9 m and 6.5 m, and the lightning protection air-gaps are 6.7 m and 7.2 m in mountains and plains, respectively.
In order to get a configuration of inverse V-type insulator tower air-gaps of double-circuit UHV AC power transmission lines, we experimentally investigated different distance air-gaps from high-voltage electrode to tower frame flashover of inverse V-type insulator. Meanwhile, we obtained the flashover characteristics curves of power frequency voltage, 1 000 μs long wave-front switching impulse voltage, and lightning impulse of UHV AC double-circuit tower. Results show that the 50% flashover voltage gradient of bottom phase air-gaps is higher than that of middle phase. The 50% flashover voltage gradient of 1 000 μs wave-front switching impulse of bottom phase air-gaps is 4.6% higher than that of the middle phase. Based on the test results and the characteristics of operating voltage and over-voltage of UHV AC power transmission system, the UHV AC double-circuit tower inverse V-type insulator air-gaps configuration is proposed. The air-gaps configuration of power frequency voltage and switching overvoltage are 2.9 m and 6.5 m, and the lightning protection air-gaps are 6.7 m and 7.2 m in mountains and plains, respectively.
引文
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[12]范冕,万磊,戴敏,等.不同串型设计条件下的特高压交流同塔双回线路雷电性能[J].高电压技术,2014,40(12):3902-3910.FAN Mian,WAN Lei,DAI Min,et al.Lightning performance of UHVAC double-circuit transmission lines on the same tower under different design conditions of insulator string[J].High Voltage Engineering,2014,40(12):3902-3910.
[2]绝缘配合第1部分:定义原则和规则:GB311.1—2012[S].北京:国家质量监督检验检疫总局,2012.Insulation co-ordination—part 1:definitions,principles and rules:GB311.1—2012[S].Beijing,China:General Administration of Quality Supervision,Inspection and Quarantine of the People’s Republic of China,2012.
[3]魏梦婷,霍锋,阮江军,等.特高压交流输电线路倒V型绝缘子串电场分布计算和均压环参数优化设计[J].电工电能新技术,2016,35(10):23-28.WEI Mengting,HUO Feng,RUAN Jiangjun,et al.Electric field distribution optimization on V-type insulator strings for UHV AC transmission lines[J].Advanced Technology of Electrical Engineering and Energy,2016,35(10):23-28.
[4]谢梁,叶奇明,罗晓庆,等.特高压交流串补装置相间操作冲击放电特性[J].高电压技术,2016,42(2):551-556.XIE Liang,YE Qiming,LUO Xiaoqing,et al.Phase-to-phase switching impulse discharge characteristics of UHVAC series compensation[J].High Voltage Engineering,2016,42(2):551-556.
[5]刘庭,唐盼,周炳凌,等.500 k V线路绝缘斗臂车带电作业安全距离试验[J].高电压技术,2016,42(7):2315-2321.LIU Ting,TANG Pan,ZHOU Binglin,et al.Experiment research of minimum approach distance for live working used of 500 k V insulated aerial vehicles[J].High Voltage Engineering,2016,42(7):2315-2321.
[6]霍锋,李晓彬,张虎,等.一种提高输电线路空气间隙绝缘强度方法的研究[J].电工电能新技术,2015,34(12):65-70.HUO Feng,LI Xiaobin,ZHANG Hu,et al.Study on one method of improving air-gaps insulation strength for power transmission lines[J].Advanced Technology of Electrical Engineering and Energy,2015,34(12):65-70.
[7]万启发,霍锋,谢梁,等.长空气间隙放电特性研究综述[J].高电压技术,2012,38(10):2499-2505.WAN Qifa,HUO Feng,XIE Liang,et al.Summary of research on flashover characteristics of long air-gaps[J].High Voltage Engineering,2012,38(10):2499-2505.
[8]RAFAEL R N,WALLACEDO d C B.Insulation coordination considering the switching overvoltage waveshape-part i:methodology[J].IEEE Transactions on Power Delivery,2009,24(4):2434-2440.
[9]SAKAE T,SHIGEMITSU O,AKIRA A,et al.Flashover characteristics of long air gaps with negative switching impulses[J].IEEE Transaction on Dielectrics and Electrical Insulation,2008,15(2):399-406.
[10]谷定燮,周沛洪,陈勇,等.1 000 k V线路杆塔空气间隙距离选择[J].高电压技术,2007,33(11):15-20.GU Dingxie,ZHOU Peihong,CHEN Yong,et al.Selection of air clearance of 1 000 k V transmission line tower[J].High Voltage Engineering,2007,33(11):15-20.
[11]周沛洪,何慧雯.特高压交流试验示范工程及同塔双回输电线路操作过电压波前时间和绝缘配合计算[J].高电压技术,2014,40(6):1781-1794.ZHOU Peihong,HE Huiwen.Calculation and analysis of switching overvoltage front time and switching impulse insulation coordination for UHV AC transmission line of chinese pilot project and double-circuit project[J].High Voltage Engineering,2014,40(6):1781-1794.
[12]范冕,万磊,戴敏,等.不同串型设计条件下的特高压交流同塔双回线路雷电性能[J].高电压技术,2014,40(12):3902-3910.FAN Mian,WAN Lei,DAI Min,et al.Lightning performance of UHVAC double-circuit transmission lines on the same tower under different design conditions of insulator string[J].High Voltage Engineering,2014,40(12):3902-3910.