高海拔地区±800 kV耐张塔附近等电位进入方法

Equipotential Entry Method near ±800 kV Tension Tower at High Altitude Area

耐张塔是高海拔地区最为复杂的塔型,其附近电场计算较为困难,给基于电场分析的带电作业进入路径的选取带来较高难度。笔者选取耐张塔作为研究对象,首先仿真分析了作业区域内人体体表电场强度,接着以所受平均最大场强最小以及进入路径最短作为双重优化目标,进行基于遗传算法多目标优化,得到进入路径最优解。然后对该路径下的电位转移电流进行仿真计算,基于结果对安全防护提出要求。考虑到目标作业导线离横担距离小于塔身的这一工况,提出了一种变绳长的等电位进入方法,该法具有作业人员平均体表场强最小,安全性更好的优点。最后开展现场实测,验证了上述理论分析的正确性。

The strain tower is the most complicated tower type in high-altitude areas.It is difficult to calculate the electric field intensity nearby,which brings higher difficulty to the selection of the entry path for live working based on electric field analysis.The author selects the strain tower as the research object.First,the electric field intensity of the human body surface is simulated and analyzed.Then,the minimum average electric field intensity and the shortest entry path are made as the dual optimization goals,and multi-objective optimization based on genetic algorithm is performed to obtain the optimal so-lution of the entry path.Secondly,the potential transfer current under the path is simulated and calcula-ted,and the requirements for safety protection are put forward based on the results.Considering the spe-cial working condition that the distance between the target wire and the cross arm is smaller than the tower body,a method of equipotential entry with variable rope length is proposed.This method has the advanta-ges of the smallest average surface field intensity of the operator with better safety.Finally,field tests were carried out to verify the correctness of the above theoretical analysis.