Comparative Study of DC and AC Breaking Characteristics

doi:10.16628/j.cnki.2095-8188.2021.05.002

Abstract

Abstract:

In the evaluation of DC breaking capacity and low frequency AC breaking capacity,there are general opinions in the industry:AC is easier to break than DC for the same voltage and expected short-circuit current due to the existence of natural zero crossing point of AC.This paper compares and analyzes the degree of difficulty of DC breaking and AC breaking at different frequencies,especially the comparison with AC breaking capacity of low frequency.It is concluded that with the decrease of AC frequency,AC breaking is more difficult than DC.

Key words: direct drive fan, DC breaking capacity, AC breaking capacity, breaking capacity comparison, natural zero crossing

CLC Number:

TM561

GONG Zuoyong, XIANG Honggang. Comparative Study of DC and AC Breaking Characteristics[J]. LOW VOLTAGE APPARATUS, 2021, 0(5): 5-8.

Figures/Tables 13

试验形式及参数		I_max/kA	T_arc/ms	$∫ i 2 d t$ /(kA²·s)	分断情况
电网交流		15.77	8.44	806	1次O后失效
电网直流 (时间常数)	τ=1 ms	9.6~9.9	5.8~6.1	312~324	3次O后OK
	τ=5 ms	7.7~8.3	10.1~11.0	304~356
	τ=10 ms	6.8~7.2	20.3~21.7	368~413
振荡回路 (频率)	f=18.7 Hz	11.3	14.4	630	1次O后失效
	f=24.9 Hz	12.5~13.0	10.5~10.9	657~736	3次O后OK
	f=33.2 Hz	13.0~13.7	8.3~8.5	583~673
	f=43.8 Hz	14.2~14.6	6.9	600~655
	f=50.0 Hz	14.7~15.2	5.8~6.0	581~642
	f=75.5 Hz	16.5~17.6	4.3~4.4	556~640
	f=99.4 Hz	15.6~17.2	3.5~3.8	507~569

试验形式	电压值/V	电流有效值/kA	电流峰值/kA	频率 /Hz
电网交流	400(有效值)	14	23.8	50
电网直流	400	14	14.0	—
振荡回路	565 (电容器充电电压)	14	20.0	变化

f/Hz	L/μH	C/μF
18.7	206.4	325 500
24.9	162.0	238 500
33.2	108.0	174 000
43.8	89.7	132 000
50.0	98.9	123 000
75.5	62.8	84 000
99.4	49.3	61 500

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