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

摘要/Abstract

摘要：

通过检测SF₆分解物可发现GIS设备故障,但设备内部分解物扩散效应会影响检测的故障特征组分气体含量,从而导致判断设备故障存在不足,因此文中针对典型SF₆分解物SO₂在GIS设备内部的扩散效应和影响因素进行研究。文中基于CFD技术,仿真模拟SO₂在设备内部的扩散效应,在压力为0.4 MPa条件下,研究了10种初始浓度对SO₂扩散的影响,拟合得到了初始浓度与扩散均匀时浓度的函数关系式,为判断故障的严重性提供理论依据。保持初始浓度不变,在压力分别为0.4 MPa、0.5 MPa、0.6 MPa、0.7 MPa和0.8 MPa的条件下,得到SO₂扩散达到均匀的时间分别为3 940 s、3 850 s、3 740 s、3 630 s和3 550 s,结果表明SF₆气体的压力环境对SO₂扩散有一定的影响,压力越大,SO₂扩散均匀所需要的时间越短。文中综合讨论了压力和初始浓度共同作用对SO₂扩散的影响,为在线监测技术设定监测周期提供了理论依据。

关键词: CFD技术, GIS设备, SO₂, 扩散效应, 影响因素, 浓度, 压力, SF₆分解物

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

中图分类号:

TP15

贺毅,张靖,张英,朱春晓. 基于CFD技术的GIS设备中SO₂扩散效应[J]. 电子科技, 2023, 36(4): 21-28.

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.

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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

基于CFD技术的GIS设备中SO₂扩散效应

SO₂ Diffusion Effect in GIS Equipment Based on CFD Technology

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