带电作业人体对高压工频电场测量影响的研究

Influence of Live Working Human Body on the Measurement of High Voltage Power Frequency Electric field

电网运维过程中的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也增加了作业人员和机械设备的危险性,实时准确监测电场环境、在电场过强时对电力人员实时报警,对电力人员的安全具有重要的意义。通过有限元的方法,以110 kV输电线路为例,研究了带电作业人体在极限安全距离下对高压工频电场测量的影响。对比了位于输电线路上、下、侧三个方位有无人体时的电场测量差异性,且计算了带电作业人员不同身体部位的电场差异性。三个方位有无人体时的电场测量差异最大可达183.08%,因此电场报警装置应考虑人体对电场畸变的影响以及人体监测方位和位置对报警阈值进行修正。

Although live working in the process of power grid operation and maintenance ensures the uninterrupted operation of power grid,it also increases the risk of operators and mechanical equipment compared with traditional methods.Real time and accurate monitoring of the electric field environment and real-time alarm to power personnel when the electric field is too strong are of great significance to the safety of power personnel.Taking 110 kV transmission line as an example,the influence of live working human body on the measurement of high voltage power frequency electric field under the limit safety distance by finite element method is studied in this paper.The differences of electric field measurement with and without human body in the upper,lower and side directions are compared,and the differences of electric field in different body parts of live line workers are calculated.The maximum difference of electric field measurement with or without human body in the three directions can reach 183.08%.Therefore,the electric field alarm device should consider the influence of human body on electric field distortion and the monitoring direction and position of human body to correct the alarm threshold.