09,22,2026 22 views
With the rapid development of China's power industry, the widespread application of SF6 technology, and the urgent need for smart grid construction, there is an urgent need to solve the online comprehensive monitoring technology for SF6 electrical equipment.
SF6 gas is currently an ideal insulation and arc extinguishing medium due to its inherent characteristics. But its micro water content, gas density, and other factors will have a direct impact on the operation of equipment, personnel safety, and the reliability of the power grid. Therefore, monitoring the micro water content and gas density of SF6 electrical equipment has always been an important component of equipment monitoring in related industries. The relevant departments have successively formulated relevant standards to strictly control the quality of SF6 gas, especially the micro water content. The recommended standards of the Ministry of Electric Power, including the "Preventive Testing Code for Power Equipment (DL/T596-1996)", the national standard "Guidelines for Gas Management and Inspection in SF6 Gas Insulated Equipment (GB/T 8905-1996)", and the IEEE standard "IEEE Guide for Moisture Measurement and Control in SF6 Gas Insulated Equipment (IEEE Std 1125-1993)", all control moisture in the form of the moisture to SF6 gas volume ratio (ppm).
The SF6 gas micro water density online monitoring system has changed the traditional time-consuming and labor-intensive offline measurement method that pollutes the environment. It can accurately measure multiple indicators of SF6 gas in real time, laying a solid foundation for the intelligent construction of the power grid.
It has the following functions:
1. Realize real-time monitoring of SF6 gas density, micro water and their changing trends, and provide change trend curves when SF6 gas related indicators change; Automatic alarm when the relevant indicators reach the alarm state;
2. If SF6 gas leaks, the pressure and density values monitored by the sensor will undergo abnormal changes or trend changes. The system will immediately indicate the pressure or density changes caused by the leak and provide a warning signal;
3. If the water content of SF6 gas exceeds the standard, the micro water value monitored by the sensor will change abnormally, and the system will immediately give a warning signal to prompt maintenance personnel to carry out system maintenance;
4. Collect gas pressure, temperature, and dew point data, calculate the gas pressure at 20 ℃ based on the collected data, calculate the moisture content (μ L/L), and quantitatively evaluate whether there are gas leaks, excessive moisture defects, and their severity. Report the lightweight results of "failure probability and time" and the unified format measurement data of "gas pressure (MPa), moisture (μ L/L), and time" to the backend;
5. Proactively submit lightweight result information and unified format monitoring data to the backend every hour. Immediately send a message to the backend for every 5% increase in the probability of failure.
