摘要
树线早期故障常被视为扰动遭到忽视,但其间歇频发将导致断线、火灾等严重事故。研究其产生机理与发展过程并提取故障信号特征,可指导树线早期故障的检测与辨识,提高配电线路的运维水平。基于磁流体动力学仿真及早期故障模拟试验,对树线分离阶段故障伴生电弧的发展过程与故障电压电流波形进行了研究。结果表明:随着树枝与导线逐渐分离,电弧长度增加,温度下降,故障电流波形的零休持续时间随之增加;与树枝为阳极相比,铝绞线为阳极时电弧温度更高;故障电流由正至负过零时,零休的持续时间比电流由负至正过零时更长。前述特征的出现源于故障的产生与发展机理,与树枝运动速度、树木种类无关。研究结果为进一步实现树线早期故障的辨识奠定了基础。
The tree-contact incipient fault,often regarded as a disturbance,is frequently ignored.However,its intermittent and frequent occurrence can cause serious accidents such as disconnection of lines and fire.By studying its generation mechanism and development process,and extracting fault signal characteristics,the detection and identification of tree-contact incipient fault can be realized,thus the operation and maintenance level of distribution lines can be improved.Based on magneto-hydrodynamic simulation and fault tests,the development process and fault waveform characteristics of the arc in separation phase are studied.The results show that,as the branch is gradually separated from the wire,the length of the arc increases and the temperature of the arc decreases,leading to an increase in the duration of the zero cur-rent time of the fault current waveform.The temperature of the arc is higher when the aluminum stranded wire acts as the anode,meanwhile,when the current is reversed from positive to negative,the duration of the zero current time is signifi-cantly longer than that when the current is reversed from negative to positive.The occurrence of the aforementioned characteristics is due to the generation and development mechanism of the failure,and it is not affected by the speed of branch movement and the type of tree.The results can lay a foundation for further realization of the tree-contact incipient fault.
作者
丛子涵
刘亚东
严英杰
李维
陈昊蓝
江秀臣
CONG Zihan;LIU Yadong;YAN Yingjie;LI Wei;CHEN Haolan;JIANG Xiuchen(School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Electric Power Research Institute,Yunnan Power Gird Co.,Ltd.,Kunming 650217,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2023年第3期1224-1233,共10页
High Voltage Engineering
基金
国家重点研发计划(2019YFE0102900)。
关键词
配电线路
树线早期故障
磁流体动力学
故障发展过程
波形特征
power distribution line
tree-contact incipient fault
magnetohydrodynamics
the development process of fault
characteristics of the waveform
