摘要
煤矿10 kV供电系统发生单相接地故障时,因系统采样频率较小,传统暂态选线方法容易丢失“选线信息”,且受故障初相角与高阻接地影响较大,最终导致选线错误,严重制约故障后恢复供电的速度。提出了“脉冲层叠极性选线法”,利用零序电流层叠点极性相反特性,结合有效点占比进行选线;结合平舒煤矿地面10 kV供电系统发生单相接地故障情况,进行Matlab/Simulink仿真验证。结果表明:该方法不受故障初相角、接地电阻以及是否漏采“选线信息”的影响,选线结果准确、可靠。
When a single-phase grounding fault occurs in the coal mine 10 kV power supply system, due to the low sampling frequency of the system, the traditional transient line selection method is easy to lose the “line selection information”, and is greatly affected by the initial phase angle of the fault and the high-resistance grounding, which eventually leads to line selection error, seriously restricts the speed of power restoration after the fault;in this paper, the“line selection method through the polarity of stacked pulse”is proposed, which uses the opposite polarity of the stacked zero-sequence current points and combines the proportion of effective points to select the line. Combined with the single-phase-grounding fault of the ground 10 kV power supply system in Pingshu Coal Mine, Matlab/Simulink simulation verification was carried out. The results show that the method is not affected by the initial phase angle of the fault, grounding resistance and whether the “line selection information”is omitted, and the line selection results are accurate and reliable.
作者
郭润寿
曹继元
GUO Runshou;CAO Jiyuan(Huayang New Materials Science and Technology Group Co.,Ltd.,Yangquan 045000,China;School of Mechanical Electronic and Information Engineering,China University of Mining and Technology(Bejing),Bejing 100083,China)
出处
《煤矿安全》
CAS
北大核心
2022年第11期141-147,共7页
Safety in Coal Mines
关键词
煤矿供电系统
消弧线圈
单相漏电
脉冲极性
暂态特征参数
故障选线
coal mine power supply system
petersen coil
single-phase leakage
pulse polarity
transient characteristic parameters
fault line selection
