基于CFD技术的GIS设备中SO2扩散效应

doi:10.16180/j.cnki.issn1007-7820.2023.04.003

Abstract

Abstract:

GIS equipment faults can be found by detecting SF₆ decomposition materials. However, due to the diffusion effect of decomposition materials inside the equipment, the gas content of detected fault characteristic components will be affected, resulting in insufficient equipment fault judgment. Therefore, the diffusion effect and influencing factors of typical SF₆ decomposition SO₂ in GIS equipment are investigated in this study. Based on CFD technology, this study simulates the diffusion effect of SO₂ inside the equipment. Under the condition of 0.4 Mpa, the influence of 10 initial concentrations on the diffusion of SO₂ is detected, and the function relation between the initial concentration and the concentration when the diffusion is uniform is obtained by fitting, which provides theoretical basis for judging the severity of the fault. Under the conditions of 0.4 MPa,0.5 MPa,0.6 MPa,0.7 MPa and 0.8 Mpa, the time for SO₂ diffusion to reach uniform is 3 940 s,3 850 s,3 740 s,3 630 s and 3 550 s, respectively. These results show that the pressure environment of SF₆ gas has a certain influence on SO₂ diffusion, that is, the higher the pressure, the shorter the time required for the uniform diffusion of SO₂. This study comprehensively discusses the influence of the combined action of pressure and initial concentration on SO₂ diffusion, which provides a theoretical basis for setting the monitoring period of on-line monitoring technology.

Key words: CFD technology, GIS equipment, SO₂, diffusion effect, influencing factors, concentration, pressure, SF₆decomposition

CLC Number:

TP15

HE Yi,ZHANG Jing,ZHANG Ying,ZHU Chunxiao. SO₂ Diffusion Effect in GIS Equipment Based on CFD Technology[J].Electronic Science and Technology, 2023, 36(4): 21-28.

Figures/Tables 16

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SO₂初始浓度/μL×L^-1	扩散均匀的时间/s	扩散均匀时最大浓度/μL×L^-1	扩散均匀时最小浓度/μL×L^-1
5 000	12 500	35.5	34.5
4 000	11 320	28.8	27.8
3 000	9 260	20.7	19.7
2 000	7 930	13.9	12.9
1 000	6 130	7.0	6.0
800	5 630	5.9	4.9
500	3 940	4.1	3.1
200	2 830	1.8	0.8
100	1 950	1.3	0.3
50	1 160	1.0	0.0

C₁/μL×L^-1	C₂/μL×L^-1	C₁/μL×L^-1	C₂/μL×L^-1
50	0.5	1 000	6.5
100	0.8	2 000	13.4
200	1.1	3 000	20.2
500	3.5	4 000	28.0
800	5.5	5 000	35.0

监测点	X/m	Y/m	Z/m	监测点	X/m	Y/m	Z/m
1	0	0.000	-0.325	7	2	0.000	0.000
2	0	0.000	0.325	8	2	0.325	0.000
3	1	0.325	0.000	9	2	-0.325	0.000
4	1	-0.325	0.000	10	2	0.000	0.325
5	1	0.000	0.325	11	2	0.000	-0.325
6	1	0.000	-0.325	12	1	0.475	0.000

压力/MPa	初始浓度/μL·L^-1	扩散均匀时间/s
0.4	5 000	12 500
	2 000	7 930
	1 000	6 130
	500	3 940
0.6	5 000	12 230
	2 000	7 750
	1 000	5 980
	500	3 740
0.8	5 000	12 040
	2 000	7 570
	1 000	5 790
	500	3 550

方法	扩散均匀时最大浓度/μL×L^-1	扩散均匀时最小浓度/μL×L^-1
本文所用方法	0.30	0.21
对比实验数据	0.27	0.23

SO₂ Diffusion Effect in GIS Equipment Based on CFD Technology

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SO2 Diffusion Effect in GIS Equipment Based on CFD Technology

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SO₂ Diffusion Effect in GIS Equipment Based on CFD Technology