基于热浮力-磁场力结合的并联间隙电弧运动模型

采用链式电弧模型，分析并联间隙装置之间产生的电弧所受到的磁场力、空气阻力和热浮力，获得了电弧运动速度控制方程，建立考虑热浮力作用的架空线路并联间隙电弧运动模型，并以110kV架空输电线路并联间隙电弧进行仿真计算，与实验结果相比较。结果表明：所建电弧运动模型能有效计及热浮力对电弧运动的影响，电弧运动计算时间和实测时间基本相符；仿真发现，由于热浮力使电弧竖直向上运动，在间隙上电极会偶尔发生上弧根和电极短路而引起弧根跳跃，这能合理解释试验过程中观察到的弧根不规则跳跃现象。另外，还分析了电流大小、电极形式对电弧运动过程的影响，仿真表明：电弧运动到电极末端的时间随着电流的增大呈指数衰减；流畅的结构设计有利于电弧的疏导和转移。

Long AC Arc Movement Model for Parallel Gap Lightning Protection Device With Consideration of Thermal Buoyancy and Magnetic Force

The paper employed the arc chain model to obtain the velocity equation of arc movement through the force analysis of each arc element,and set up the arc movement model with consideration of thermal buoyancy.As a validation,simulation of arc movement in the parallel gap lightning protection device(PGLPD) on 110?kV overhead transmission line was conducted and showed good correspondence with experimental results.The time of arc movement obtained from simulation which takes consideration of thermal buoyancy agr...