转检修过程中35kV落地手车倾倒风险分析

Risk analysis of the 35kV ground handcart tripping over in the process of transfer to maintenance

为提升开关柜燃弧状态下的柜体防爆能力,将其更新为铠装移开式户内交流金属封闭开关设备,增加了约0.06m的下门框,导致35kV落地手车在转检修过程中须沿引轨滑落至地面,克服落地高差。由于落地手车重心较高、后倾角较小,因而其倾倒风险较大。本文采用SolidWorks对3种典型的35kV落地手车进行仿真,计算其重心并明确后倾角,得到转检修过程中35kV落地手车沿引轨自由滑落至地面的速度和倾倒临界速度,发现3种落地手车的落地速度均大于其倾倒临界速度,表明手车一旦受阻急停则必倾倒,威胁人身安全。

In order to enhance the explosion proof capability of the cabinet under the internal short circuit arcing fault of switchgear,it is updated to clad withdrawable indoor AC metal-enclosed switchgear,which added about 0.06m lower door frame,resulting the 35kV ground handcart to track along the guide rail to the ground in the process of transfer to maintenance to overcome the landing height difference.The gravity center of the 35kV ground handcart is high,and the castor angle is small,so the tripping over risk is large.This paper uses Solid Works simulation of three typical 35kV ground handcarts to calculate the center of gravity and the castor angle,and calculate the speed of the free landing to the ground and the critical tripping over speed.It is found that the landing speed of the handcart in the process of transfer to maintenance is greater than the critical tripping over speed.Once the handcart is blocked by the emergency stop,it will dump,which is threatening personal safety.