Study on Arc Reignition Influencing Factors of HVDC Relay Under Permanent Magnet Field

doi:10.16628/j.cnki.2095-8188.2024.08.005

Abstract

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

CLC Number:

TM572.1

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.

Figures/Tables 23

References 24

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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