基于电流流向判别的交流输电线路闪络塔定位方法
发布时间：2018-08-26 14:49
【摘要】：针对交流输电线路闪络杆塔准确定位困难的问题,仿真计算了线路绝缘子串闪络后短路电流沿避雷线和杆塔的分布,给出了1种实用的闪络塔准确监测系统。按实际线路参数在ATP-EMTP软件中建立的仿真模型计算结果表明:在每基杆塔接地电阻相同的情况下,95%的工频短路电流沿避雷线分流至其他杆塔;短路电流的分布受杆塔接地电阻的影响,杆塔入地电流的大小不能判断杆塔是否闪络。进一步提出了用杆塔避雷线两边工频短路电流流向的异同来判断该塔是否闪络:若短路电流流向相反则杆塔闪络,短路电流流向相同则未闪络。基于此方法设计制作了交流输电线路闪络杆塔定位系统:在塔顶地线两边各安装1个工频电流传感器,传感器与闪络监测子机相连,子机根据传感器信号判断杆塔是否闪络,闪络信息经子机接力传递至主机,主机将其以短信形式发回服务器。该系统经模拟故障试验验证可以准确定位闪络杆塔,并及时发送闪络杆塔号。
[Abstract]:Aiming at the difficulty of accurately locating the flashover tower of AC transmission line, the distribution of short circuit current after flashover of line insulator string along the lightning arrester and tower is simulated and calculated, and a practical accurate monitoring system for flashover tower is presented. The simulation model established in ATP-EMTP software according to the actual line parameters shows that 95% of the power frequency short-circuit current flows along the lightning protection line to other towers under the same grounding resistance of each base tower; The distribution of the short circuit current is affected by the grounding resistance of the tower, and the magnitude of the tower earth current can not determine whether the tower is flashover or not. Furthermore, the similarities and differences of the power frequency short circuit current flow on both sides of the tower lightning protection line are proposed to determine whether the tower is flashover: if the short circuit current flows in opposite direction, the pole tower flashover, and the short circuit current flow in the same direction is not flashover. Based on this method, an AC transmission line flashover tower positioning system is designed and manufactured: one power frequency current sensor is installed on each side of the tower top ground line, the sensor is connected with the flashover monitoring submachine, and the submachine judges whether the pole tower is flashover or not according to the sensor signal. The flashover information is transmitted to the host through the submachine relay, and the host sends it back to the server in the form of short message. The system can accurately locate the flashover tower and send the flashover tower number in time.
【作者单位】： 武汉大学电气工程学院;福建省电力有限公司检修分公司;
【基金】：中国-苏格兰博士生教育及科研基金([2010]6044)~~
【分类号】：TM721.2
[Abstract]:Aiming at the difficulty of accurately locating the flashover tower of AC transmission line, the distribution of short circuit current after flashover of line insulator string along the lightning arrester and tower is simulated and calculated, and a practical accurate monitoring system for flashover tower is presented. The simulation model established in ATP-EMTP software according to the actual line parameters shows that 95% of the power frequency short-circuit current flows along the lightning protection line to other towers under the same grounding resistance of each base tower; The distribution of the short circuit current is affected by the grounding resistance of the tower, and the magnitude of the tower earth current can not determine whether the tower is flashover or not. Furthermore, the similarities and differences of the power frequency short circuit current flow on both sides of the tower lightning protection line are proposed to determine whether the tower is flashover: if the short circuit current flows in opposite direction, the pole tower flashover, and the short circuit current flow in the same direction is not flashover. Based on this method, an AC transmission line flashover tower positioning system is designed and manufactured: one power frequency current sensor is installed on each side of the tower top ground line, the sensor is connected with the flashover monitoring submachine, and the submachine judges whether the pole tower is flashover or not according to the sensor signal. The flashover information is transmitted to the host through the submachine relay, and the host sends it back to the server in the form of short message. The system can accurately locate the flashover tower and send the flashover tower number in time.
【作者单位】： 武汉大学电气工程学院;福建省电力有限公司检修分公司;
【基金】：中国-苏格兰博士生教育及科研基金([2010]6044)~~
【分类号】：TM721.2
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