摘要
喷射等离子体触发型SF_(6)间隙开关用于混合直流输电系统消能装置控制开关的优势十分明显,但极低工作系数下的喷射等离子体诱导SF_(6)间隙开关击穿作用规律尚不明晰。为此搭建了喷射等离子体诱导击穿试验平台,研究了SF_(6)间隙中喷射等离子体特征参数的时空分布特性,以及触发条件参数和主间隙施加电压的作用规律。结果表明,喷射等离子体呈高亮度的类圆锥形状,其初始发展速度可达2.0km/s以上。提高SF_(6)间隙开关触发腔中第2级腔(连接中间电极)的电容值和充电电压,其第2级间隙的沿面放电电流随之增大,触发腔的导通时延及其分散性也会随之降低;同时喷射等离子体的几何特征量(面积、径向和轴向长度以及发展速度等)和电气参量均随之渐进增大。增大间隙开关高压电极的施加电压,即提高其工作系数,SF_(6)间隙开关诱导击穿末期的等离子体喷射速度出现抬升现象;且随着工作系数的增大,喷射等离子体的头部局部电场畸变增强,引起其头部带电粒子的运动速度进一步提高,喷射速度的抬升效应愈加显著。研究成果为高压大容量强绝缘气体间隙开关的等离子体喷射触发性能的提升方法提供理论指导。
Plasma jet-triggered SF_(6) gap switch has obvious advantages in the control switch of the self-recovery energy dissipation device used to solve the fault of hybrid HVDC transmission system.However,for the SF_(6) gap switch with extremely low operating coefficient,the action mechanism of its jetting plasma in the process of the SF_(6) gap induced breakdown is still unclear.Consequently,a jet plasma triggering test platform was established to study the spatiotemporal distribution and development characteristics of SF_(6) gap jet plasma,the parameters of triggering conditions,and the operating voltage of the main gap.The results show that the jet plasma has a high-brightness cone-like shape,and the initial growth rate can exceed 2 km/s at most.When the capacitance value and charging voltage of the secondary cavity(connected to the middle electrode)in the SF_(6) gap switch trigger cavity,the discharge current of the secondary cavity is increased,and the conduction delay and dispersion of the trigger cavity will be also reduced.At the same time,the geometric characteristics(including area,radial and axial length,and development velocity)and electrical parameters of the jet plasma increase gradually.As the operating voltage of the high-voltage electrode of SF_(6) gap switch increases,that is,as its working coefficient increases,the plasma jet velocity at the end of SF_(6) gap switch breakdown rises.With the increase of the operating coefficient,the local electric field distortion at the plasma jetting head is enhanced,which will further increase the movement speed of the charged particles at the plasma head,and the rise effect of the jetting velocity is more significant.The research results provide theoretical guidance for improving the triggering performance of high voltage,large capacity and strong insulating gas-gap switch plasma injection.
作者
董冰冰
张泽霖
李志兵
张竹
向念文
DONG Bingbing;ZHANG Zelin;LI Zhibing;ZHANG Zhu;XIANG Nianwen(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China;China Electric Power Research Institute,Beijing 100192,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2022年第1期348-357,共10页
High Voltage Engineering
基金
国家自然科学基金(52107142)
国家电网公司总部科技项目——基础性、前瞻性院士专项(5400-202055451A-0-0-00)。
