电工技术学报  2020, Vol. 35 Issue (18): 3860-3868    DOI: 10.19595/j.cnki.1000-6753.tces.190977
电机与电器 |
纵向磁场下中频真空电弧的重燃现象分析
蒋原1, 李擎1, 崔家瑞1, 武建文2, 贾博文2
1.北京科技大学自动化学院工业过程知识自动化教育部重点实验室 北京 100083;
2.北京航空航天大学自动化科学与电气工程学院 北京 100083
Re-Ignition of Intermediate Frequency Vacuum Arc at Axial Magnetic Field
Jiang Yuan1, Li Qing1, Cui Jiarui1, Wu Jianwen2, Jia Bowen2
1. Key Laboratory of Knowledge Automation for Industrial Processes of Ministry of Education School of Automation and Electrical Engineering University of Science and Technology Beijing Beijing 100083 China;
2. School of Automation Science and Electrical Engineering Beihang University Beijing 100083 China
全文: PDF (60346 KB)   HTML
输出: BibTeX | EndNote (RIS)      
摘要 中频供电系统已在航空电源中得到广泛应用。根据实验结果,电流开断能力从360Hz时的22.4kA下降至850Hz时的14.0kA。该文研究纵向磁场下360~850Hz真空电弧开断失败时的重燃现象。由Mayr模型的最小二乘法解可知,发生击穿时电弧能量衰减的时间加长,这是不利于电流开断的。一方面,随着电流频率的增加,相对小的电流值就会使电流过零时的变化率di/dt达到开断阈值;另一方面,频率提高会增强涡流效应,导致纵向磁场过零后的剩余磁感应强度和滞后相位增加,阻碍过零后等离子体扩散。实验中发现,电弧重燃点总出现在触头边缘处,计算表明触头边缘处的电场强度集中、电流密度高,进而导致场致发射的概率增大。此外利用帧差法分析电弧图像,估算得到金属液滴的运动喷射速度为10~20m/s。电流过零后金属液滴的消失时间大于中频电流半个周波时间,金属液滴的存在是引起电弧重燃的因素。
服务
把本文推荐给朋友
加入我的书架
加入引用管理器
E-mail Alert
RSS
作者相关文章
蒋原
李擎
崔家瑞
武建文
贾博文
关键词 中频真空电弧纵向磁场电弧重燃涡流效应场致发射    
Abstract:Intermediate frequency (IF, 360-800Hz) power supply system has been widely used in more-electric aircrafts. The IF current interruption ability decreases from 22.4kA/360Hz to 14.0kA/850Hz according to the experimental results. In this paper, post-arc re-ignition of IF vacuum arc in axial magnetic field (AMF) is studied. By the solution of the Mayr arc model, the decay time of arc energy is prolonged when re-ignition happens, which goes against current interruption. With the increase of frequency, a small current will cause the change rate of current di/dt to reach the threshold at the time of zero-crossing. In addition, the eddy effect is enhanced, resulting in the increase of the residual magnetic induction intensity and hysteresis phase of AMF. It is found that the re-ignition position in IF vacuum arc always appears first at the margin of contacts. As shown by ANSYS calculation, the electric field at the margin is stronger and the current density is higher, thereby increasing the probability of field emission. By analyzing the arc images, the velocity of metal particles is about 10~20m/s and the dissipation time of the metal particles is longer than the arc time, which may cause the IF vacuum arc re-ignition.
Key wordsIntermediate frequency vacuum arc    axial magnetic field    re-ignition    eddy current effect    field emission   
收稿日期: 2019-08-02     
PACS: TM561  
基金资助:国家自然科学基金面上项目(51677002)、中国博士后科学基金项目(2018M631307)和中央高校基本科研业务费项目(FRF-TP-19-035A1)资助
通讯作者: 武建文 男,1963年生,博士,教授,博士生导师,研究方向为电器及其智能控制、真空开关电弧理论、电机电器测试和故障诊断和电力电子技术。E-mail: wujianwen@buaa.edu.cn.   
作者简介: 蒋 原 男,1985年生,博士,讲师,研究方向为航空真空电弧理论及应用、电器状态检测与故障诊断、智能微网及新能源技术。E-mail: jiangyuan@ustb.edu.cn
引用本文:   
蒋原, 李擎, 崔家瑞, 武建文, 贾博文. 纵向磁场下中频真空电弧的重燃现象分析[J]. 电工技术学报, 2020, 35(18): 3860-3868. Jiang Yuan, Li Qing, Cui Jiarui, Wu Jianwen, Jia Bowen. Re-Ignition of Intermediate Frequency Vacuum Arc at Axial Magnetic Field. Transactions of China Electrotechnical Society, 2020, 35(18): 3860-3868.
链接本文:  
https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.190977          https://dgjsxb.ces-transaction.com/CN/Y2020/V35/I18/3860