Influence of Power Factor and Closing Angle on Short Circuit Test of Miniature Circuit Breaker

doi:10.16628/j.cnki.2095-8188.2021.06.010

Abstract

Abstract:

The short circuit test is a conventional type test for miniature circuit breakers.GB/T 10963.1—2005 specifies the relevant requirements of test parameters (test voltage,test current,power factor,closing phase angle,etc.) in detail.However,the influence of power factor and closing phase angle on short circuit test is not clear,which brings some troubles to testers.In this paper,the short circuit current mathematical expression is taken as a starting point,combined with the common short circuit test cases,from the theoretical analysis and test results analysis,the influence of power factor and closing phase angle on the miniature circuit breaker short-circuit test is analyzed,to deepen the understanding of circuit breaker short-circuit test.

Key words: miniature circuit breaker(MCB), short circuit current, power factor, closing phase angle

CLC Number:

TM561

HUANG Bin, ZHANG Yuxing, LIU Cheng. Influence of Power Factor and Closing Angle on Short Circuit Test of Miniature Circuit Breaker[J]. LOW VOLTAGE APPARATUS, 2021, 0(6): 58-62.

试验电流/A	对应功率因数
≤1 500	0.93~0.98
1 500~3 000	0.85~0.90
3 000~4 500	0.75~0.80
4 500~6 000	0.65~0.70
6 000~10 000	0.45~0.50
10 000~25 000	0.20~0.25

参数	不同功率因数时数值
参数	0.30	0.50	0.75
分断电流峰值I_p/kA	5.06	4.60	4.04
焦耳能量积分I²t/(kA²·s)	54.6	46.9	39.4
总分断时间T_mb/ms	6.49	5.84	2.75
燃弧时间T_arc/ms	5.00	4.34	1.25

合闸相角/(°)	电流峰值/kA	合闸相角/(°)	电流峰值/kA
0	3.51	60	2.67
15	3.36	75	2.42
30	3.15	90	2.23
45	2.81

合闸相角/(°)	电流峰值/kA	分断能量/(kA²·s)
0	3.10	21.4
15	3.28	23.6
30	3.52	26.1
45	3.69	45.4
60	3.81	47.3
75	3.67	28.5

合闸相角 /(°)	电流/A
合闸相角 /(°)	0.5ms	1.0ms	1.5ms	2.0ms	2.5ms	3.0ms	3.5ms
0	64	145	250	374	511	656	810
15	91	212	348	490	640	802	955
30	142	298	453	615	774	870	972
45	173	350	512	676	833	967	1090
60	185	368	539	689	832	951	1060
75	184	362	520	654	771	866	938
90	154	329	455	569	665	721	753

Influence of Power Factor and Closing Angle on Short Circuit Test of Miniature Circuit Breaker

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