## Project Background
A 220kV GIS substation of a provincial company under the State Grid Corporation experiences an annual SF6 gas replenishment volume that is 30% higher than the design value, indicating a latent leak. The traditional weighing method is rough in positioning, has a delayed response, and incurs high operation and maintenance costs.
## Implementation Plan
Eighteen sets of fixed SF6 online monitors based on infrared principles have been deployed, covering all equipment areas within the GIS room. Additionally, six regional oxygen content monitors are equipped to provide real-time assessments of enclosed space safety. The data is integrated into the station’s integrated automation system, triggering automatic dispatch of local maintenance personnel upon the issuance of early warnings.
– Infrared principle, resolution of 1ppm, response time < 30 seconds - The GIS compartment is independently deployed, achieving leak location accuracy down to the device level - Integrated with access control: Continuous broadcast reminders before evacuation ## Implementation Effect During the 8-month trial operation, a total of 3 latent leaks were discovered (1 due to equipment manufacturing defects and 2 due to operational aging), all of which were repaired before the concentration reached the health limit. The annual gas replenishment volume was saved by 18%.
