摘要
架空地线绝缘子间隙被外力改变或遭受过电压作用下会发生间隙性击穿,严重时会出现持续燃弧的现象,实时监测地线上的电流变化情况对于架空地线的可靠运行意义重大。通过PSCAD仿真软件,建立输电线路模型,计算正常运行情况下的地线电流并分析影响因素并通过电弧开断模型分别分析了间隙击穿时刻、电弧持续时间、多点间隙击穿等因素对地线电流的影响,结果表明,线路的电压与地线电流呈正比,而电流与接地电阻不影响地线电流。同时,间隙击穿的位置、时刻和持续时间均会对击穿曲线产生不同程度影响。研究结果为架空输电线路地线状态监测提供思路和理论依据。
Due to the gap of overhead ground wire is more vulnerable to a intermittent breakdown because of external force or overvohage shock, and there will continue the phenomenon of burning arc in serious case, the real-time monitoring of the current changes in ground wire is of great significance to the reliable operation of overhead ground wire. By using the PSACD simulation software, the transmission line model is established, the influence of the factors such as gap breakdown time, arc duration and multi- point gap breakdown on the ground current is analyzed by means of arc breaking model. The results show that, the ground line currents are proportional to the line voltage, while the line currents and resistance do not affect the ground current. At the same time, the position, duration and duration of the gap breakdown will have different degrees of impact on the breakdown curve. The results provide the idea and theoretical basis for the monitoring of ground Dine condition of overhead transmission lines.
出处
《电瓷避雷器》
CAS
北大核心
2017年第5期212-217,共6页
Insulators and Surge Arresters
关键词
输电线路
地线绝缘子
接地电阻
感应电压
感应电流
transmission line
ground insulator
earth resistance
induced voltage
induced current
