Research on Inrush Current of Capacitor-Switching Contactor

doi:10.16628/j.cnki.2095-8188.2025.05.008

Abstract

Abstract:

When power capacitors are connected to a circuit, a switching inrush current exceeding 200 times the rated current will be generated.The capacitor switching contactor with a current-limiting resistor is often used to suppress the switching inrush current.In order to optimize the suppression effect,the switching inrush current waveform when the capacitor bank is put into operation is studied through the random inrush current suppression experiments,and the primary and secondary switching inrush currents are defined. Three current-limiting resistors with different resistance values are replaced on the same capacitor switching contactor,and the inrush current suppression waveforms are obtained by switching the capacitor banks with the same capacity.The study finds that if the resistance value of the current-limiting resistor is too small,the primary inrush current will exceed the application requirements,if the resistance value of the current-limiting resistor is too large,the secondary inrush current will exceed the application requirements.However,a suitable resistance value of the current-limiting resistor is selected to make the suppression of the primary and secondary inrush currents achieve the expected effect.This provides a reference for the inspection and selection of capacitor-switching contactors and the determination of the resistance value of the current-limiting resistor.

Key words: capacitor-switching contactor, current-limiting resistance, inrush current suppression, primary and secondary inrush current

CLC Number:

TM572

LI Xinye, CHEN Baisheng, ZHENG Yun. Research on Inrush Current of Capacitor-Switching Contactor[J]. LOW VOLTAGE APPARATUS, 2025, 0(5): 56-62.

Figures/Tables 12

References 7

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序号	0.55 Ω		1.10 Ω		1.65 Ω
序号	一次涌流	二次涌流	一次涌流	二次涌流	一次涌流	二次涌流
1	289.1	494.3	163.3	795.7	79.8	715.8
2	230.9	658.2	111.4	238.8	80.6	745.8
3	214.8	424.2	134.5	536.8	60.5	658.3
4	94.2	671.3	119.7	961.5	55.2	450.8
5	193.0	246.9	54.2	770.1	57.5	612.5
6	183.7	498.6	81.2	441.2	54.9	411.4
7	238.3	151.2	139.6	913.7	108.6	1 182.0
8	211.7	390.4	124.1	1021.0	83.2	808.4
9	195.8	277.3	107.9	988.4	84.5	754.0
10	199.8	165.2	142.5	945.8	58.0	220.0
11	140.5	420.9	61.6	829.3	53.7	785.0
12	207.2	232.9	59.7	171.9	50.6	873.5
13	138.6	437.3	157.9	744.1	71.3	398.5
14	233.3	381.6	153.3	906.7	59.1	729.1
15	208.0	343.8	132.7	798.2	85.7	1 054.0
16	105.8	498.3	81.5	803.6	98.8	675.4
17	194.7	343.2	103.9	902.9	74.4	740.8
18	200.5	177.3	78.9	747.0	108.7	495.5
19	197.7	237.9	113.9	842.2	54.4	1 299.0
20	221.6	357.6	100.6	274.9	108.3	1 626.0
21	169.5	377.4	127.8	473.7	95.5	851.2
22	206.5	251.7	162.0	767.9	80.8	593.7
23	201.0	121.3	167.3	784.5	68.6	633.0
24	166.4	139.9	155.4	519.6	94.4	433.5
25	216.3	179.2	127.1	988.2	97.0	378.8
26	223.9	396.7	142.1	991.6	84.2	967.3
27	230.8	330.9	154.6	609.1	89.2	962.7
28	166.2	626.9	126.4	213.8	88.0	571.4
29	186.9	733.6	90.5	221.0	95.7	616.0
30	94.7	449.0	100.1	683.9	102.0	883.0
31	76.7	339.0	97.2	770.8	40.3	783.4
32	76.6	134.7	124.8	711.0	45.8	774.7
33	85.0	207.4	118.7	734.1	64.8	917.5
34	135.5	411.7	107.0	245.5	60.2	181.8
35	125.8	419.5	99.7	120.6	86.4	634.1
36	117.7	354.5	94.0	797.9	60.2	980.6
37	223.7	282.5	65.6	534.8	47.7	777.8
38	190.2	134.6	85.1	699.3	48.7	682.7
39	170.2	137.4	96.4	516.8	53.7	1237.0
40	166.1	431.1	125.9	172.8	73.1	791.7
41	80.6	134.9	89.1	299.8	87.0	836.0
42	72.5	189.1	101.5	693.1	43.4	742.7
43	180.1	378.2	86.6	831.1	67.0	112.8
44	210.3	638.5	111.0	668.7	99.3	794.7
45	138.9	387.6	123.6	226.1	108.2	1116.0

序号	0.55 Ω		1.10 Ω		1.65 Ω
序号	一次涌流	二次涌流	一次涌流	二次涌流	一次涌流	二次涌流
1	6.7	11.5	3.8	18.5	1.9	16.6
2	5.4	15.3	2.6	5.6	1.9	17.3
3	5.0	9.9	3.1	12.5	1.4	15.3
4	2.2	15.6	2.8	22.4	1.3	10.5
5	4.5	5.7	1.3	17.9	1.3	14.2
6	4.3	11.6	1.9	10.3	1.3	9.6
7	5.5	3.5	3.2	21.2	2.5	27.5
8	4.9	9.1	2.9	23.7	1.9	18.8
9	4.6	6.4	2.5	23.0	2.0	17.5
10	4.6	3.8	3.3	22.0	1.3	5.1
11	3.3	9.8	1.4	19.3	1.2	18.3
12	4.8	5.4	1.4	4.0	1.2	20.3
13	3.2	10.2	3.7	17.3	1.7	9.3
14	5.4	8.9	3.6	21.1	1.4	17.0
15	4.8	8.0	3.1	18.6	2.0	24.5
16	2.5	11.6	1.9	18.7	2.3	15.7
17	4.5	8.0	2.4	21.0	1.7	17.2
18	4.7	4.1	1.8	17.4	2.5	11.5
19	4.6	5.5	2.6	19.6	1.3	30.2
20	5.2	8.3	2.3	6.4	2.5	37.8
21	3.9	8.8	3.0	11.0	2.2	19.8
22	4.8	5.9	3.8	17.9	1.9	13.8
23	4.7	2.8	3.9	18.2	1.6	14.7
24	3.9	3.3	3.6	12.1	2.2	10.1
25	5.0	4.2	3.0	23.0	2.3	8.8
26	5.2	9.2	3.3	23.1	2.0	22.5
27	5.4	7.7	3.6	14.2	2.1	22.4
28	3.9	14.6	2.9	5.0	2.0	13.3
29	4.3	17.1	2.1	5.1	2.2	14.3
30	2.2	10.4	2.3	15.9	2.4	20.5
31	1.8	7.9	2.3	17.9	0.9	18.2
32	1.8	3.1	2.9	16.5	1.1	18.0
33	2.0	4.8	2.8	17.1	1.5	21.3
34	3.2	9.6	2.5	5.7	1.4	4.2
35	2.9	9.8	2.3	2.8	2.0	14.7
36	2.7	8.2	2.2	18.6	1.4	22.8
37	5.2	6.6	1.5	12.4	1.1	18.1
38	4.4	3.1	2.0	16.3	1.1	15.9
39	4.0	3.2	2.2	12.0	1.2	28.8
40	3.9	10.0	2.9	4.0	1.7	18.4
41	1.9	3.1	2.1	7.0	2.0	19.4
42	1.7	4.4	2.4	16.1	1.0	17.3
43	4.2	8.8	2.0	19.3	1.6	2.6
44	4.9	14.8	2.6	15.6	2.3	18.5
45	3.2	9.0	2.9	5.3	2.5	26.0

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