特高压线路引流板发热处置方法分析

Analysis on Heat Treatment Method of UHV Line Drainage Board

带电作业是特高压输电线路最直接、最有效的检修手段,对保障特高压电网的安全稳定运行和国家能源安全具有意义。文中以带电处理特高压线路引流板温升异常为例,分别分析了"从横担上乘坐吊篮到达作业点"、"采用吊篮法从塔身进入跳线"和"采用软梯法到达作业点"的可行性,最终确定作业方式为:从横担上登上软梯,沿地线滑出后,再沿软梯进入等电位。针对此种作业方式,利用有限元仿真软件分析了"人在杆塔上","软梯滑行到绝缘子串中间位置"以及"人位于导线上"时的作业人员体表分布,计算结果表明:在整个进入等电位过程中,体表场强最大出现在处于导线上的作业人员头顶处,达到1 706 kV/m。当作业人员穿屏蔽效率为60 dB带电作业用屏蔽服,并配有屏蔽效率不小于20 dB的网状屏蔽面罩,即可保证作业人员的安全。在采取上述方法和措施后,作业人员顺利完成了此次带电处理特高压线路温升异常的任务。

As the most direct and effective overhaul measure of UHV transmission lines, live working has significance for ensuring safe and stable operation of UHV grids and security of national energy. In this paper, we analyzes feasibilities among ＂reaching operation point by taking the basket from the crossarm＂, ＂entering the jumper from the tower body with the hanging basket＂ and ＂reaching the operation point with the rope ladder＂ based on abnormal temperature rise of UHV lines during live working, and finally decided the operation mode of stepping on the rope ladder from the crossarm, sliding out along the ground wire, and then entering the equipotential along the rope ladder. In order to achieve this operation mode, the body surface intensity distribution of operators ＂when operators are on the tower＂, ＂when the rope ladder slips to the middle position of the insulator chain＂, and ＂when operators are located on the wire＂ are analyzed with the finite simulation software. The calculation result shows that in the whole process of entering the equipotential, the largest flied intensity on body surface appears on top of operators＇ heads on the wire which is nearly reaching 1,706 kV/m. When the operators wear shield cloths with 60 dB shielding efficiency, and mesh shield mask whose shielding efficiency is no smaller than 20 dB, the safety of the operators can be ensured. After taking all problems into account and using the above method for operation, the operators smoothly finished the task of processing abnormal temperature rise of UHV lines alive.