Research on Arc Root Stagnation of Contact Edge Phenomenon and Influencing Factors in DC Interruption

doi:10.16628/j.cnki.2095-8188.2024.04.004

Abstract

Abstract:

The evolution of arc root has an important effect on the switching efficiency of DC air circuit breaker. Based on the magneto-hydro-dynamics (MHD) model, the essential cause for the arc root stagnation of the contact edge was simulated and analyzed. The effects of the external magnetic field and breaking speed for the arc root stagnation of the contact edge were obtained. The results show that the transfer of the arc root from the contact to the arc runner is completed through breakdown. The arc root stagnation of the contact edge is formed because the arc runner has not reached the breakdown condition before the arc root transfers. With the increase of magnetic field intensity, the arc root stagnation time of the contact edge decreases, and the ability to shorten the arc root stagnation of the contact edge becomes weak, eventually tends to be saturated. At the initial stage of arcing, increasing the contacts breaking speed within a certain rang is conducive to reduce the arc root stagnation time. However, excessively increasing the contacts breaking speed has a weak effect on reducing the arc root stagnation time under the influence of Lorentz force and airflow field.

Key words: DC, air arc, arc root stagnation of the contact edge, magneto-hydro-dynamics (MHD), breaking speed

CLC Number:

TM561

BAO Yuliang, LI Jing, DUAN Wei, PENG Shidong, LIU Shuxin. Research on Arc Root Stagnation of Contact Edge Phenomenon and Influencing Factors in DC Interruption[J]. LOW VOLTAGE APPARATUS, 2024, 0(4): 30-37.

Figures/Tables 12

方程	瞬态项	平流项	扩散项	源项
质量守恒	0	?·(ρv)	0	0
动量守恒	$? (ρ v) ? t$	?·(ρvv)+?ρ	?·(τ)	J×B
能量守恒	$? (ρ H) ? t$	?·(ρHv)	?· $λ c p ? H$	$1 σ J 2 - S r a d + S φ$

边界	压力边界	磁场边界	电场边界	传热边界
KLMN	1 atm	$? A ? n$ =0	—	—
IJ	—	$? A ? n$ =0	φ=0 V	$? T ? t$ =0
AB,EF	—	$? A ? n$ =0	φ=220 V	$? T ? t$ =0

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磁场/ mT	阳极弧根是否停滞	停滞时间/ ms	跃迁时刻/ ms
35	是	1.4	2.20
50	是	1.1	1.78
80	是	1.0	1.59

开断速度/ (m·s^-1)	阳极弧根是否停滞	停滞时间/ ms	跃迁时刻/ ms
1	是	4.78	6.21
3	是	2.06	2.79
5	是	1.40	2.20
7	是	1.46	1.98