带电线路中施工机械安全距离作业下的临界电场研究

针对带电作业虽然保证了电网的不间断运行，但相较于传统的方法增加了作业人员和机械设备危险性的问题，展开了带电线路中施工机械安全距离作业下的临界电场研究。首先，论述了输电线路一般安全距离的计算方法，提出现有带电作业中安全距离确定方法的弊端。进而建立可移动吊塔带电作业有限元模型，以110 kV 和220 kV 交流输电线路为例，研究安全距离下的临界电场，计算并得到不同作业位置的临界电场阈值，并且在现场进行了电场强度、安全距离的实测验证，从而为施工机械临近电安全距离预警提供依据。研究结果可为电力系统安全稳定运行提供技术支撑。

Study on the Critical Electric Field of Construction Machinery Working at Safe Distance in Operating Lines

In order to ensure the safe and stable operation of transmission lines,live working has become a more extensive operation method compared with the traditional poweroff operation.Although live working ensures the uninterrupted operation of the power grid,compared with the traditional methods,it also increases the risk of operators and mechanical equipment.Therefore,this paper studies the critical electric field under the safe distance operation of mechanical appliances in live line.First of all,this paper discusses the calculation method of the general safe distance of transmission line,and points out the disadvantages of the method of determining the safety distance in live working.Then,the finite element model of live working with movable crane tower is established.Taking 110 kV and 220 kV AC transmission lines as examples,the critical electric field under safe distance is studied,and the threshold value of critical electric field at different working positions is calculated and obtained,so as to provide guidance for the electric safety distance alarm of construction machinery approaching.The research results can provide technical support for the safe and stable operation of the power system.