Simulation Study on Arc Extinguishing Performance Improvement of 1 500 V DC Molded Case Circuit Breaker with Folded Arc Extinguishing Chamber

doi:10.16628/j.cnki.2095-8188.2026.06.006

Abstract

Abstract:

Aiming at the significant influence of air duct parameters on the arc extinguishing performance of the folded arc extinguishing chamber for 1 500 V DC molded case circuit breakers, multi-parameter design of the air duct structure and multi-objective optimization of its arc extinguishing performance are performed. Taking the arc voltage rise time and peak voltage as optimization objectives, simulation analysis of the folded arc extinguishing chamber is carried out using the orthogonal test method. The optimization results show that compared with the original scheme, increasing the bending angle of the arc guide bridge, reducing the number of grid plates, increasing the number of exhaust holes, and enlarging the distance between the grid plate group and the gas baffle are conducive to accelerating arc transfer and increasing the arc voltage; after optimization, the voltage rise time of the circuit breaker is shortened by 22.7%, the peak voltage is increased by 10.7%, and the overall arc extinguishing performance is significantly enhanced. A reference is provided for the design of arc extinguishing chambers in high-voltage DC molded case circuit breakers.

Key words: DC molded case circuit breaker, folded arc extinguishing chamber, arc extinguishing performance, air duct parameters, simulation analysis

CLC Number:

TM561

CHEN Xiongchu, LI Jing, WU Qijun. Simulation Study on Arc Extinguishing Performance Improvement of 1 500 V DC Molded Case Circuit Breaker with Folded Arc Extinguishing Chamber[J]. LOW VOLTAGE APPARATUS, 2026, 0(6): 52-58.

Figures/Tables 11

References 17

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关键参数	几何意义	取值范围	对灭弧性能的核心影响
引弧桥折弯角度θ/(°)	引弧桥水平段与导向段的夹角	98~99	过小增加转移路径,过大易导致电弧卡滞
栅片数量N/片	栅片组中栅片总数	58~60	数量越多,短弧叠加效应越强,但过多易堵塞间隙
排气孔数量K/个	顶部排气孔总数(孔径2 mm)	7~9	过少阻碍电弧进栅片,过多导致高电压维持时间缩短
栅片组-挡气板距离d/mm	栅片与挡气板的最短垂直距离	3~5	过小则缓冲腔压力不足,冷却差,过大则气流滞留,增加重燃风险

材料	参数	数值
Cu	密度/(kg·m^-3)	8 940
	热导率/[W·(m·K)^-1]	400
	比热容/[J·(kg·K)^-1]	385
	电导率/(S·m^-1)	5.998×10⁷
	相对磁导率	1
Fe	密度/(kg·m^-3)	7 870
	热导率/[W·(m·K)^-1]	76.2
	比热容/[J·(kg·K)^-1]	440
	相对磁导率	400
聚己二酰乙二胺 (PA66)	密度/(kg·m^-3)	1 150
	热导率/[W·(m·K)^-1]	0.36
	比热容/[J·(kg·K)^-1]	1 670

组号	上升时间/ms	电压峰值/V
1	7.60	1 395.30
2	7.85	1 352.21
3	7.65	1 404.16

因素	一水平	二水平	三水平
A:栅片组-挡气板距离/mm	3	4	5
B:栅片数量/片	58	59	60
C:排气孔数量/个	7	8	9
D:引弧桥折弯角度/(°)	98.0	98.5	99.0

试验号	A	B	C	D
1	3	58	7	98.0
2	3	59	8	98.5
3	3	60	9	99.0
4	4	58	8	99.0
5	4	59	9	98.0
6	4	60	7	98.5
7	5	58	9	98.5
8	5	59	7	99.0
9	5	60	8	98.0