In the power system,SF6Gas is widely used in high-voltage switchgear and composite electrical appliances due to its excellent insulation and arc extinguishing performance（GIS）Waiting for the core device. However,SF6Gas leakage not only leads to a decrease in equipment insulation performance, but its decomposition products are also more likely to pose a threat to personnel health. Regarding the pain points in this industry,SF6The gas online monitoring system has become a key technical equipment for ensuring the safe operation of the power grid through real-time perception and intelligent warning.

1、 Core monitoring function: real-time perception of multi-dimensional environmental parameters

The system is equipped with a high-precision sensor array, which can synchronously monitorSF6Gas concentration（0-5000ppmRange), oxygen content（0-25%Scope), environmental temperature and humidity（-20℃to+99℃temperature0-99%RHThe three core parameters are humidity. whenSF6Concentration exceeds1000ppmSafety threshold or oxygen content below18%At this time, the system immediately triggers a three-level alarm mechanism: the local sound and light alarm emits a high-frequency alarm,LEDRed warning on the display screen, and at the same time, through4G/LoRaWireless communication pushes real-time alarm information to the operation and maintenance platform. For example, in a certain500kVIn substation applications, the system successfully detected leaks in the early stagesSF6Sudden increase in concentration, ahead of schedule12Activate emergency plans in minutes to prevent equipment failures from escalating.

2、 Intelligent linkage control: automated risk management system

The system has a built-in fan linkage control module that can automatically execute ventilation strategies based on monitoring data. When detectedSF6When there is a leak or oxygen deficient environment,5The independent fan interface of the road can start the axial flow fan in different zones, and dilute the concentration of toxic gases through forced ventilation. According to statistics from a provincial power grid company, after adopting this system,GISThe replacement time of room gas is changed from the traditional mode45Minutes shortened to8Improved efficiency of safety preparation before personnel enter confined spaces in minutes82%In addition, the system supports timed ventilation function, which can be done on a daily basis7:00-9:00、15:00-17:00Automatic operation during waiting periods effectively prevents chronic leakage accumulation caused by equipment aging.

3、 Data intelligent analysis: closed-loop management from monitoring to early warning

passRS485/ModbusCommunication protocol, the system can be connected to the substation monitoring master station to achieve historical data storage and trend analysis. Its million level data storage capacity is traceable3The monitoring records within the year, combined with the built-in expert diagnostic system, can automatically identify patterns such as changes in leakage rate, temperature and humidity correlation effects. In a certain ultra-high voltage direct current project, the system analyzes the continuity through analysis6Month long data fluctuations accurately identified the aging issue of a certain interval sealing ring, guiding maintenance personnel to replace components in advance and saving direct economic losses200Ten thousand yuan.

4、 Security Protection Upgrade: Full Scene Personnel Protection Mechanism

System integration for the safety requirements of operation and maintenance personnel entering and exiting the switch room3Meter range infrared human body sensing function. When personnel are detected approaching, automatic voice prompts will be played:'current environmentSF6Normal concentration/Exceeding the standard, please pay attention to protection'In emergency situations, operation and maintenance personnel can forcibly start all wind turbines through wireless remote control, and the system automatically records operation logs to meet the audit requirements of power safety work regulations.

The monitoring system has been approved by State Grid Corporation of ChinaAClass device authentication, in35kVto1000kVVoltage level substations are widely used. It uses a dual beam infrared spectrometer（NDIR）Improved technology and anti-interference ability compared to traditional electrochemical sensors10The false alarm rate should be controlled below one in ten million. With the advancement of smart grid construction, the system is deeply integrated with IoT platforms to provide more accurate data support for equipment status maintenance.