±800 kV混合直流输电工程用DC 80 kV SF_(6)/N_(2)等离子体喷射触发间隙研制  

Development of DC 80 kV SF_(6)/N_(2) Plasma Injection Trigger Gap forμ800 kV Hybrid DC Transmission Project

作　　者：李志兵 徐晓东 张然 李晓昂[2] 黄印 赵科 LI Zhibing;XU Xiaodong;ZHANG Ran;LI Xiaoang;HUANG Yin;ZHAO Ke(China Electric Power Research Institute,Beijing 100192,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China;Electric Power Research Institute of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 211106,China)

机构地区：[1]中国电力科学研究院有限公司,北京100192 [2]西安交通大学电力设备电气绝缘国家重点实验室,西安710049 [3]国网江苏省电力有限公司电力科学研究院,南京211106

出　　处：《高电压技术》2023年第3期937-945,共9页High Voltage Engineering

基　　金：国家电网公司科技项目(5500-202155107A-0-0-00)。

摘　　要：白鹤滩—江苏±800 kV混合直流输电工程在交流侧故障穿越过程中,为了限制柔直母线上过电压吸收冗余能量需要加装可控自恢复消能装置。为了实现可控自恢复消能装置的1 ms快速投入,需要研制DC 80 kV SF_(6)/N_(2)等离子体喷射触发间隙。根据工程需求,分析了工程应用条件,明确触发间隙关键技术要求。针对高性能触发的要求,提出了高压脉冲型等离子体双级接续触发方法,设计了同轴层压式产品化触发腔,搭建触发特性试验平台,开展触发性能试验研究,并提出通过监测触发过程中储能电容电压变化在线监测触发性能的方法,研究结果表明,最低可触发电压为50 kV,触发时延在0.3 ms以内,空载触发寿命为1800次。针对大直流通流及快速绝缘恢复的要求,依据横磁电极旋弧原理,完成自旋弧主电极设计,开展电场及旋弧仿真,设计搭建了通流及绝缘恢复试验回路开展试验研究,拍摄电弧运动。结果表明,电弧能够沿主电极边缘高速旋转,实现30kA/50ms通流后0.1s恢复耐受1.5倍额定电压、通流寿命50次。基于上述关键问题的解决,完成了双冗余等离子体喷射触发间隙本体及高电位测控的成套装置结构设计,研制了样机并通过了第三方性能试验验证,绝缘、触发和通流关键技术指标全面满足白江工程要求并将工程应用。During AC-side fault ride-through of the Baihetan-Jiangsu±800 kV hybrid DC transmission project,a controlled self-recovery dissipation device was added in order to limit the overvoltage absorption of redundant energy on the flexible bus.In order to achieve a rapid 1ms input of the controlled self-recovery dissipation device,a DC 80 kV SF_(6)/N_(2) plasma jet trigger gap needs to be developed.According to the engineering requirements,the engineering application conditions were analyzed and the key technical requirements for the trigger gap were clarified.To meet the requirements of high performance triggering,a high voltage pulse type plasma.double-stage succession triggering method is proposed,a coaxial laminated type productized triggering chamber was designed,a test platform for triggering characteristics was set up,a test study of triggering performance was carried out,and a method for online monitoring of triggering performance by monitoring the voltage change of the energy storage capacitor during the triggering process was proposed.The research results show that the minimum triggerable voltage is 50 kV,the trigger time delay is 0.3 ms,and the no-load trigger life is 1800 times.In order to meet the requirements of large direct-current flow and fast insulation recovery,the design of the main electrode of the spin-arc was completed based on the principle of transverse magnetic electrode spin-arc,and the electric field and spin-arc simulation was carried out.The results show that the arc is capable of rotating at high speed along the edge of the main electrode,recovering to withstand 1.5 times the rated voltage in 0.1 s after 30 kA/50 ms through-current,and withstanding 50 through-current cycles.Based on the solution of the above key issues,the structural design of the dual redundant plasma jet trigger gap body and the high potential measurement and control package was completed.The prototype has been developed and verified by the third party performance tests.The key technical indicators of insulation,trigger

关 键 词：混合直流输电工程 等离子体喷射 触发间隙 触发寿命 通流能力 

分 类 号：TM721.1[电气工程—电力系统及自动化]