低压断路器中空气电弧重击穿现象的仿真与实验研究_杨茜+++++++++++++++++++++++.pdf

27 卷 6 期 中 国 电 机 工 程 学 报 Vol.27 No.6 Feb. 2007 2007 年2 月 Proceedings of the CSEE 2007 Chin.Soc.for Elec.Eng. 文章编号：0258-8013 (2007) 06-0084-05 中图分类号：TM561.1 文献标识码：A 学科分类号：47040 低压断路器中空气电弧重击穿现象的 仿真与实验研究 茜，荣命哲，吴 翊，孙志强 (西安交通大学电力设备电气绝缘国家重点实验室，陕西省 西安市 710049) Simulation and Experimental Research on Air Arc Restriking in Low-voltage Circuit Breaker YANG Qian, RONG Ming-zhe, WU Yi, SUN Zhi-qiang (State Key Lab of Electrical Insulation and Power Equipment, Xi ’an Jiaotong University, Xi ’an 710049, Shaanxi Province, China) ABSTRACT: Low-voltage circuit breakers are used to switch 现象，而当磁场增大到5mT 时重击穿现象消失。此外，还 on and off electrical current in circuit. During the interruption 发现当磁场为 10mT 时，在出口面积分别为 20%、60%和 process, the contacts of the breaker are separated and an 100% 3 种情况下电弧均可以顺利到达栅片，在运动的过程 electric arc is established between contacts. Under the actions 中没有电弧重击穿现象的发生。 of Lorentz and aerodynamic forces, the arc has to move along 关键词：空气电弧等离子体；磁流体动力学；电弧重击穿 the rail electrodes toward the quenching area. During the 0 引言 motion process, the stagnation and back commutation occur and worsen the performances of circuit breaker. According to 低压断路器是一种用于接通、承载以及分断电 the real interruption process, a three-dimensional(3-D) model 路中电流的开关电器。当电路中出现故障电流时， of arc motion under the effect of external magnetic field is built 断路器的动静触头分开时会在触头间的介质中产 based on magnetohydrodynamic(MHD), which can predict the 生电弧，随后电弧在外界磁场的作用下进入灭弧栅 restriking phenomena. With a