Design on Heat Dissipation Structure of High Power Electrical Control Box

doi:10.16628/j.cnki.2095-8188.2023.04.010

Abstract

Abstract:

Based on the differential equation of heat conduction,fluid motion control equation,and radiation heat transfer equation,a mathematical model of coupled heat transfer in an electrical control box is established.The three-dimensional temperature field and airflow field are numerically calculated under steady-state conditions of the electrical control box.The relevant temperature rise tests are carried out.The calculated results are in good agreement with the test results.The error meets the actual engineering requirements.Finally,the highest temperature portion and heat dissipation law of the current carrying circuit are pointed out.The proportion of radiation heat exchange in the total heat dissipation of the current carrier circuit is calculated.The temperature rise of the current carrying circuit is simulated for different current carrying circuit emissivity and different heat dissipation box structures.The results show that improving the surface emissivity of the current carrying circuit and changing the top brim to open the shutter can effectively reduce the temperature rise of the electrical control box.

Key words: control box, heat dissipation, thermal simulation, temperature rise

CLC Number:

TM592

GUO Qing. Design on Heat Dissipation Structure of High Power Electrical Control Box[J]. LOW VOLTAGE APPARATUS, 2023, 0(4): 61-66.

Figures/Tables 8

References 11

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序号	名称	试验温升/K	仿真温升/K	允许温升/K	误差率 /%
1	A相进线接线端	55.2	54.8	70	0.7
2	B相进线接线端	57.1	55.7	70	2.5
3	C相进线接线端	54.1	54.9	70	1.5
4	A相出线接线端	60.2	56.1	70	6.8
5	B相出线接线端	61.8	59.0	70	4.5
6	C相出线接线端	59.6	56.3	70	5.5
7	金属外壳(易触及)	7.8	7.2	30	4.8
8	内部空间	8.3	7.9	25	7.6

序号	名称	辐射换热/W	对流换热/W	辐射换热占总散热比例/%
1	A相进线铜排	13.3	36.7	26.6
2	B相进线铜排	13.5	36.5	27.0
3	C相进线铜排	13.3	36.7	26.6
4	A相出线铜排	1.1	1.7	39.3
5	B相出线铜排	1.1	1.7	38.6
6	C相出线铜排	1.1	1.7	37.9
7	A相熔断器	12.9	67.1	16.1
8	B相熔断器	13.0	67.0	16.3
9	C相熔断器	12.9	67.1	16.1
10	接触器	13.3	76.7	14.8

序号	名称	辐射换热占总散热比例/%
序号	名称	发射率为0.3	发射率为0.9
1	A相进线铜排	26.6	51.2
2	B相进线铜排	27.0	51.4
3	C相进线铜排	26.6	51.4
4	A相出线铜排	39.3	75.0
5	B相出线铜排	38.6	75.0
6	C相出线铜排	37.9	75.0
7	A相熔断器	16.1	33.5
8	B相熔断器	16.3	33.3
9	C相熔断器	16.1	34.0
10	接触器	14.8	31.4

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