等离子体喷射触发型SF_(6)间隙开关触发寿命试验研究  

Experimental Study on Trigger Life of SF_(6) Gap Switch Triggered by Plasma Jet

作　　者：朱浩 李志兵 李晓昂[3] 张然 王永兴[1] 董冰冰 ZHU Hao;LI Zhibing;LI Xiao’ang;ZHANG Ran;WANG Yongxing;DONG Bingbing(School of Electrical Engineering,Dalian University of Technology,Dalian 116024,Liaoning Province,China;China Electric Power Research Institute,Haidian District,Beijing 100192,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi Province,China;School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,Anhui Province,China)

机构地区：[1]大连理工大学电气工程学院,辽宁省大连市116024 [2]中国电力科学研究院有限公司,北京市海淀区100192 [3]西安交通大学电气工程学院,陕西省西安市710049 [4]合肥工业大学电气与自动化工程学院,安徽省合肥市230009

出　　处：《电网技术》2021年第8期3298-3304,共7页Power System Technology

基　　金：国家自然科学基金项目(51977022,51877026,51807154)。

摘　　要：为实现白鹤滩—江苏±800kV特高压混合直流输电工程可控自恢复泄能装置的快速控制,研制高气压大触发能量的新型等离子体喷射触发型SF_(6)间隙开关样机,该间隙开关触发腔采用两级触发腔沿面放电接续触发结构,可以实现在极低工作系数下1ms内的快速可靠触发。为提高SF_(6)间隙开关的触发寿命,搭建试验平台并进行试验研究。首先研究触发腔结构尺寸对SF_(6)间隙开关寿命的影响,结果表明增加第一级触发腔的沿面距离可以有效提高触发寿命,但不宜过长,否则会产生熄弧现象,故触发腔尺寸采用3.5mm+6mm;然后研究触发腔材料对触发寿命的影响,结果表明聚四氟乙烯的产气能力和抗烧蚀能力比较均衡,综合性能要优于添加二硫化钼或氮化硼的聚四氟乙烯,可以有效提高触发寿命达到583次;研究表明触发腔劣化是SF_(6)间隙开关触发寿命终止的根本原因,据此提出触发腔劣化过程的监测方法,根据触发过程中一级腔沿面闪络电压、二级腔导通时储能电容的剩余电压、二级腔导通时延、主间隙导通时延等特征参量随触发次数的变化可以监测触发腔的劣化过程,从而监测触发腔状态,提高可靠性。通过上述研究,SF_(6)间隙开关样机的触发寿命达到了583次,满足了工程需求,并具备触发腔状态监测功能,提高了可靠性。In order to realize the fast control of controllable self recovery energy release device used in Baihetan Jiangsu±800kV Ultra High Voltage(UHV)Hybrid DC transmission project,a novel plasma jet triggered SF_(6) gap switch prototype with high air pressure and large trigger energy is developed.The trigger cavity of the gap switch adopts a two-stage surface discharge structure,which can realize fast and reliable triggering within 1ms under extremely low working coefficient.In order to improve the trigger life of SF_(6) gap switch,a test platform was built and the experimental research was carried out.Firstly,the influence of the structure size of the trigger cavity on the life of the SF_(6) gap switch is studied.The results show that increasing the surface distance of the first stage trigger cavity can effectively improve the trigger life,but the cavity should not be too long,otherwise it will cause arc extinction.So the size of the trigger cavity is 3.5mm+6mm.Then,the influence of the trigger chamber material on the trigger life is studied.The results show that the gas production capacity and ablation resistance of polytetrafluoroethylene(PTFE)are relatively balance.The comprehensive performance of PTFE is better than that of polytetrafluoroethylene with molybdenum disulfide or boron nitride,which can effectively increase the trigger life to 583 times.The research shows that the deterioration of the trigger cavity is the fundamental reason for the end of the trigger life of SF_(6) gap switch.In this paper,a monitoring method of the deterioration process of the trigger cavity is proposed.The variation of some characteristic parameters with trigger times can be used to monitor the deterioration process of the trigger cavity,such as the surface flashover voltage of the primary cavity,the residual voltage of the energy storage capacitor when the secondary cavity is on,the conduction delay of the secondary cavity and the conduction delay of the main gap,so as to monitor the state of the trigger cavity and improve the re

关 键 词：SF_(6)间隙开关 聚四氟乙烯 触发寿命 可靠性 

分 类 号：TM721[电气工程—电力系统及自动化]