永磁体磁场作用下高压直流继电器电弧重燃的影响因素研究

doi:10.16628/j.cnki.2095-8188.2024.08.005

摘要/Abstract

摘要：

电弧重燃是延长高压直流继电器开断时间的重要原因。为了研究灭弧室内电弧重燃特性,利用Comso1 Multiphysics软件仿真获得永磁体磁场,作为电弧仿真的基础条件,仿真分析磁场强度、开断速度、触头形状和气氛压力作用下电弧动态特性及电弧重燃的原因;设计4因素3水平正交试验,并结合仿真研究各因素对电弧重燃的影响程度。结果表明,电弧间隙的散热条件和电弧电压反施加于弧隙的电场强度是电弧重燃的重要原因;散热条件越差或电弧电压反施加的电场强度越高,越容易发生电弧重燃;4个因素对电弧重燃的影响程度依次为开断速度、气氛压力、触头形状和磁场强度。

关键词: 高压直流继电器, 电弧重燃, 永磁体, 正交试验

Abstract:

Arc reignition is an important reason for prolonging the disconnection time of highvoltage DC relays.In order to study the reignition characteristics inside the arc extinguishing chamber,the permanent magnet magnetic field was simulated by Comsol Multiphysics and the result was used as the basic condition for arc simulation.The dynamic characteristics of the arc and the reasons for arc reignition under the influence of magnetic field strength,breaking speed,contact shape,and atmospheric pressure were simulated and analyzed.A four factor three-level orthogonal experiment was designed,and the degree of influence of each factor on arc reignition was studied through simulation.The results indicate that the heat dissipation conditions in the arc gap and the electric field strength exerted by the arc voltage on the arc gap are important reasons for arc reignition.The worse the heat dissipation conditions or the higher the electric field strength exerted by the reverse arc voltage,the easier it is for arc reignition to occur.The degree of influence of four factors on arc reignition is in the order of breaking speed,gas pressure,contact shape,and magnetic field strength.

Key words: high voltage DC relay, arc reignition, permanent magnet, orthogonal test

中图分类号:

TM572.1

林臻, 张鹏, 刘向军. 永磁体磁场作用下高压直流继电器电弧重燃的影响因素研究[J]. 电器与能效管理技术, 2024, 0(8): 34-44.

LIN Zhen, ZHANG Peng, LIU Xiangjun. Study on Arc Reignition Influencing Factors of HVDC Relay Under Permanent Magnet Field[J]. LOW VOLTAGE APPARATUS, 2024, 0(8): 34-44.

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h/mm	重燃次数/次	重燃时刻/ms	电弧能量/J	电弧持续时间/ms	最大残留温度/K	电弧到达边缘时刻/ms
10	0	—	1.051	1.08	5 805.9	0.26
9	1	0.71	1.613	1.29	6 043.9	0.24
8	1	0.59	1.383	1.15	6 183.8	0.21
7	1	0.51	1.219	1.05	6 188.6	0.19
6	1	0.45	1.138	1.05	6 199.8	0.17

开断速度/ (mm·s^-1)	重燃次数/次	电弧持续时间/ms	电弧能量/J	最大残留温度/K
700	0	0.96	0.832	5 138.6
600	0	1.01	0.884	5 358.6
500	1	1.15	1.383	6 183.8
400	1	1.29	1.449	6 238.9
300	2	1.58	2.109	6 407.4

气氛压力/ MPa	重燃次数/次	电弧持续时间/ms	电弧能量/J	最大残留温度/K
0.01	0	2.17	4.174	4 193.9
0.05	2	1.48	2.064	5 822.6
0.10	1	1.15	1.383	6 183.8
0.15	0	1.06	0.975	5 228.1
0.20	0	1.06	1.008	4 624.4

边缘曲率半径/mm	重燃次数/次	电弧持续时间/ms	电弧能量/J	最大残留温度/K
≈0	1	1.15	1.383	6 183.8
0.5	1	1.07	1.393	5 988.3
1.0	0	0.97	1.022	5 336.8
1.5	0	0.97	1.078	5 179.1
2.0	0	0.95	1.062	5 001.7

永磁体与触头中心距离/mm	重燃概率/%
h₀	70
h₀+2	40
h₀+4	30