Factors Affecting Near Pole Voltage Drop of Ferromagnetic Grating in Low Voltage Circuit Breakers

doi:10.16628/j.cnki.2095-8188.2024.08.003

Abstract

Abstract:

The arc voltage in low voltage circuit breakers is directly related to the arc extinguishing performance of the circuit breaker,and the near pole voltage drop of the grating directly affects the magnitude of the arc voltage.Therefore,studying the near pole voltage drop of the grating can provide the assistance for optimizing the performance of the circuit breaker.A simplified experimental device is established,the voltage during the stable arc burning process at a DC current level of 250 A is measured,and the relationship curve between arc voltage and grating spacing is drown.The near pole voltage drop is obtained by fitting the curve.The factors affecting the near pole voltage drop are also explored from the aspects of grating material,thickness and current grade. The experimental results show that the near pole voltage drop of different materials will be different,but the grid thickness and current grade will not affect that.

Key words: low voltage circuit breaker, ferromagnetic grating, arc voltage, near pole voltage drop

CLC Number:

TM501.2

SUN Hao, ZHOU Liujun, ZHANG Xinyu, WU Yi, NIU Chunping. Factors Affecting Near Pole Voltage Drop of Ferromagnetic Grating in Low Voltage Circuit Breakers[J]. LOW VOLTAGE APPARATUS, 2024, 0(8): 21-26.

Figures/Tables 13

References 11

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栅片间距/ mm	电弧电压/V			平均值/V
栅片间距/ mm	第1组	第2组	第3组	平均值/V
0.10	19.24	18.78	19.09	19.04
0.25	20.56	20.93	21.06	20.85
0.50	24.47	24.98	24.50	24.65
1.00	25.18	26.03	25.72	27.04
2.00	30.43	29.92	30.59	30.02
3.00	31.14	30.81	31.34	31.10
5.00	32.60	33.08	32.69	32.79

栅片间距/mm	电弧电压/V
栅片间距/mm	DT4C	10号钢	环保钢
0.10	19.64	20.38	20.41
0.25	22.37	25.23	23.44
0.50	25.42	28.35	27.19
1.00	27.97	33.41	30.36
2.00	31.58.	35.64	32.83
3.00	34.61	37.00	35.57
5.00	37.55	39.06	38.02

栅片间距/mm	电弧电压/V
栅片间距/mm	DT4C、栅片厚度8 mm	DT4C、栅片厚度2 mm	10号钢、栅片厚度8 mm	10号钢、栅片厚度2 mm
0.10	19.03	19.12	19.01	19.07
0.25	19.78	19.84	20.78	21.05
0.50	21.21	21.16	24.63	24.52
1.00	23.40	23.49	28.35	28.49
2.00	25.85	25.68	30.40	30.31
3.00	27.97	28.12	31.19	31.35
5.00	31.42	31.32	32.82	32.84

栅片间距/mm	电弧电压/V
栅片间距/mm	10号钢、250 A	10号钢、2 kA	10号钢、4 kA	DT4C、250 A	DT4C、2 kA	DT4C、4 kA
0.10	18.97	19.41	20.42	19.02	19.53	19.62
0.25	20.82	22.80	25.09	19.80	21.81	22.36
0.50	24.61	26.06	28.35	21.17	23.96	25.39
1.00	28.40	30.78	33.40	23.43	26.22	28.04
2.00	30.38	32.56	35.64	25.79	29.58	31.61
3.00	31.24	35.62	36.91	28.05	32.83	34.58
5.00	32.79	37.61	39.02	31.38	37.05	37.64