Study on diffusion characteristics of SF6 gas in GIL pipe gallery under multiple leakage scenarios based on digital twin

doi:10.3969/j.issn.2097-0706.2026.02.004

Abstract

Abstract:

The internal pipeline in Gas Insulated Transmission Line （GIL）pipeline gallery involves long-distance pipeline transportation in an enclosed environment，posing significant risks in case of gas leaks. The limitations in sensor deployment have led to a relatively single leakage criterion design for a long time. To address this issue，a simulation model of gas diffusion in the pipe gallery was constructed in a virtual environment based on ANSYS software to study the diffusion characteristics of SF₆ gas under different leakage scenarios. By simulating the actual working conditions of the Su-Tong GIL pipe gallery and conducting multi-environment and multi-scenario simulations of the GIL digital twin，this study covered various leakage situations. The results provided data support for the design of intelligent algorithms for gas leak detection under different operating conditions and optimization of sensor deployment.

Key words: GIL pipe gallery, SF₆ gas leakage, diffusion characteristics, digital twin, intelligent algorithm

CLC Number:

TK01：TM75

XU Changfu, ZHAO Xindong, LIANG Wei, HE Xing, BU Yikang. Study on diffusion characteristics of SF₆ gas in GIL pipe gallery under multiple leakage scenarios based on digital twin[J]. Integrated Intelligent Energy, 2026, 48(2): 37-46.

Figures/Tables 16

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变量	空气	SF₆
摩尔质量/(kg·kmol^-1)	28.97	146.07
动力黏度/[kg·(m·s)^-1]	1.73×10^-5	1.58×10^-5
绝热指数	1.4	1.3
比定压热容/[J·(kg·K)^-1]	1 006.43	665.18
密度/(kg·m^-3)	1.23	6.16
导热系数/[W·(m·K)^-1]	0.024	0.012

场景	泄漏方向	泄漏高度	覆盖区域
1	向下	最下层	管廊顶部、中部、当侧壁面
2	向上	最上层	管廊顶部、底部、中部、对侧壁面
3	向外	中间层	管廊顶部、底部、两侧壁面

Study on diffusion characteristics of SF₆ gas in GIL pipe gallery under multiple leakage scenarios based on digital twin

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