Numerical Study of Influence of Frequency and Eddy Currents on Arc Motion in Low-Voltage Circuit Breaker
Numerical Study of Influence of Frequency and Eddy Currents on Arc Motion in Low-Voltage Circuit Breaker
复制标题
频率和涡流对低压断路器电弧运动影响的数值研究
DOI：
10.1109/tcpmt.2018.2849985
复制
发表时间：
2018-08-01
影响因子：
2.2
通讯作者：
Xu, Hongyu
中科院分区：
文献类型：
--
作者：
Yin, Jianning;Wang, Qian;Xu, Hongyu
用于永磁风力发电系统的空气断路器应断开变频的短路电流。本文着重研究了频率对空气电弧行为的影响。建立了空气电弧等离子体的三维磁流体动力学（MHD）模型，研究了电弧在不同频率下的运动过程。该模型考虑了包括电极、隔板和弧柱在内的整个计算域中的涡流，采用磁矢势法计算电流环产生的电磁场。在分流板周围形成一层具有非线性电压-电流密度特性的薄层元件，用来表征新弧根的形成和电极电压降。在此基础上，得到了电弧电压、温度、归一化时间和电流密度随频率的变化规律，并进行了比较。仿真结果表明，随着频率的升高，归一化时间、隔板涡流密度峰值和电弧电压峰值均增大。
The air circuit breaker used for permanent magnet wind power generation systems should switch OFF the short-circuit current of variable frequencies. This paper focuses on the influence of frequency on the behavior of air arc. A 3-D magnetohydrodynamic (MHD) model of air arc plasma was developed to investigate the arc motion process at variable frequencies. In this model, the eddy currents in the whole calculation domains including the electrodes, the splitter plate, and the arc column were considered, and the magnetic vector potential approach was adopted to calculate the electromagnetic field produced by the current loop. A thin layer of elements with a nonlinear voltage–current density characteristic surrounding the splitter plate was employed to represent the formation of new arc roots and electrodes voltage drop. Based on this model, the evolutions of arc voltage, temperature, normalized time, and current density were obtained and compared among variable frequencies. The simulation results reveal that the normalized time, the eddy current density peak in splitter plate, and the arc voltage peak increase at a higher frequency.