Sulfur Hexafluoride Gas Leakage Monitoring and Early-Warning Method for Electrical Power Facilities

Chunrui Liu,Feng Wang,Lei Shi,Fujie Deng

doi:10.1109/access.2020.3009229

Abstract

Most transformer substations in power supply facilities rely on sulfur hexafluoride electrical equipment. A sulfur hexafluoride gas leak can cause serious health concerns if effective measures are not adopted in time. Therefore, in this study, a sulfur hexafluoride gas leakage monitoring, early-warning, and emergency disposal model was established. First, taking the main transformer chamber of an underground transformer substation as the research object, a 3D-model was built, and a numerical simulation was performed. Second, the simulation results were utilized to determine the dispersion and concentration distribution of the sulfur hexafluoride gas, identify concentration-sensitive areas, and arrange sensors based on the simulation results, to ensure early-warning in case of leaks. Then, a sulfur hexafluoride gas leakage monitoring and early-warning model was built based on the data collected using sensors at the monitoring points; thereafter, a construction method was developed for a sulfur hexafluoride gas leakage emergency disposal model, which can be referenced to establish a leakage gas recycling system. This paper also provides some recommendations regarding the determination of the optimal conditions for this emergency recycling device, which can be utilized to maintain the concentration of sulfur hexafluoride gas below a specified value and to construct a recycling time prediction model. The results of the study can provide a theoretical basis for sulfur hexafluoride gas leakage early-warning and emergency disposal, which will contribute to the prevention of suffocation-related accidents.

Highlights

With a booming economy and rising power demand, it has become a common practice to build transformer substations in densely populated urban areas
They can provide a theoretical basis for predicting the leakage and dispersing concentration of sulfur hexafluoride in the main transformer chamber of an underground transformer substation
The construction method for the recycling time prediction model was as follows: Under the determined extraction pressure, the recycling of the sulfur hexafluoride gas in the main transformer chamber of the substation is simulated for different leakage locations and leakage orifice diameters

Summary

INTRODUCTION

With a booming economy and rising power demand, it has become a common practice to build transformer substations in densely populated urban areas. When a leak occurred at point 3, the sulfur hexafluoride gas concentration first exceeded 1000 ppm at monitoring points 2 and 1 seven times, which was more often than the times that it first exceeded this limit at the other points They can provide a theoretical basis for predicting the leakage and dispersing concentration of sulfur hexafluoride in the main transformer chamber of an underground transformer substation. The construction method for the recycling time prediction model was as follows: Under the determined extraction pressure, the recycling of the sulfur hexafluoride gas in the main transformer chamber of the substation is simulated for different leakage locations and leakage orifice diameters. 4) GAS RECYCLING AFTER DEVICE HAS BEEN WORKING FOR 1500 s In this case, the indoor sulfur hexafluoride concentration has dropped below 1000 ppm, and the indoor air is essentially harmless to the human body, as shown in Figure 10 (4)

DETERMINING CONDITIONS FOR EMERGENCY RECYCLING DEVICE

BUILDING RECYCLING TIME PREDICTION MODEL

Findings

CONCLUSIONS