摘要
直流GIL中线形金属微粒受力运动极易引发气体间隙击穿或者绝缘子沿面闪络,降低GIL的绝缘性能,严重影响直流输电系统的安全可靠运行。为研究直流GIL中线形金属导电微粒电动力学行为机理,搭建自由微粒实验装置和观测平台,并建立直流下微粒电动力学模型。通过实验与仿真相结合的方法,获得线形金属微粒荷电特性、启举与运动特性以及微粒运动导致的气隙击穿特性,并从微观角度解释了微粒启举与运动现象形成的原因。研究结果表明,线形启举电压只与半径有关,与长度和电压极性无关,随着半径增大,启举电压升高,直流电压极性不影响金属微粒启举电压幅值;线形微粒的运动及导致的气隙击穿与微粒半径、长度和电压极性有关,线形金属微粒半径小、长度增加时容易导致气隙击穿;线形金属微粒形状的不规则使得电场畸变作用加强,极性效应更明显。电晕极性效应导致正负极性下线形微粒的启举与运动及运动致气隙击穿特性呈现出明显的规律,当达到启举电压时,正极性下,线形金属微粒一端抬起后,在下极板小幅跳跃、旋转或者直立,难以贯穿气隙;负极性下,线形金属微粒贯穿气隙运动,极易出现飞萤现象,为直流GIL中线形金属微粒污染防治提供了理论指导。
The stress motion of linear metal particles in DC GIL can easily cause gas gap breakdown or surface flashover of insulators,which reduces the insulation performance of GIL and seriously affects the safe and reliable operation of the DC transmission system.In order to study the electrodynamic behavior mechanism of linear metal particles in DC GIL,the free particle experiment device and observation platform are built,and the particle electrodynamic model under DC is established.Through experiments and simulations,the characteristics of the linear particle lifting,motion and gas gap breakdown caused by particles are obtained,and the reasons of the particle lifting and motion are analyzed from the microscopic view.The results show that the lifting voltage is related to the radius and independent of length and voltage polarity.The voltage polarity does not affect the lifting voltage amplitude of metal particles.The particle motion and the resulting air gap breakdown are related to the particle radius,particle length and voltage polarity.The smaller the radius and the longer the length of the linear metal particles,the easier it is to cause the air gap to breakdown;the irregular shape of the linear metal particles strengthens the electric field distortion,and the polarity effect is more obvious.The effect of corona polarity leads to the lifting and motion of the particles under positive and negative polarities and the gas gap breakdown characteristics caused by motion show obvious laws.If the particles are lifted,under the DC positive polarity voltage,the linear metal particles will jump,rotate or standing upright near the lower electrode,and it is difficult to penetrate the air gap;under the negative polarity voltage,the particles will move through the air gap,and the phenomenon of flying firefly is easy to appear.It provides theoretical guidance for the prevention and control of the linear metal particle pollution in DC GIL.
作者
程涵
魏威
Bilal lqbal Ayubi
孙优良
张黎
Cheng Han;Wei Wei;Bilal lqbal Ayubi;Sun Youliang;Zhang Li(School of Electrical Engineering Shandong University,Jinan 250061 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2021年第24期5283-5293,共11页
Transactions of China Electrotechnical Society
作者简介
程涵,女,1997年生,硕士研究生,研究方向为直流GIL金属微粒电动力学行为及防治措施建模。E-mail:17854160922@163.com;通信作者:张黎,男,1979年生,副教授,博士生导师,研究方向为高电压与绝缘技术。E-mail:zhleee@sdu.edu.cn。
