At present, the two test methods are more accurate, and the implementation procedures are: vacuum inspection→SF6 gas→sulfur hexafluoride gas leakage inspection.
The specific process is: after the GIS has been vacuum leak-tested and the SF6 gas is static for 5h, wrap it with a plastic film on the flange joints, etc., and then check it after another 24h. If the SF6 gas concentration in the film is greater than 30ppm, the gas The leak rate of the chamber is unqualified. If the concentration of SF6 gas in all the wrapping films is less than 30ppm, the air leakage rate of the gas chamber is considered qualified.
Sulfur hexafluoride gas leakage online monitoring and alarm system is an intelligent gas alarm system that detects on-site SF6 gas concentration, oxygen content, temperature and humidity and other environmental data, and controls and alarms through a large amount of data analysis and processing.
SF6 gas leak detection mainly adopts electrochemical technology, electrical breakdown technology and infrared spectrum absorption technology.
1. Electrochemical technology: The principle of electrochemical technology is that the detected gas touches the surface of the catalyst at a high temperature of about 200°C, and a corresponding chemical reaction occurs with it, thereby generating a change in the electrical signal to discover the detected gas.
2. Electrical breakdown technology: The electrical breakdown technology evolved from the typical application of SF6 gas in electricity, which is used in GIS switchgear as a marginal gas. Its working principle is to judge whether the air contains SF6 gas based on the nature of the SF6 gas edge, from the change of the high-voltage electrical voltage placed in the detected air.
3. Infrared spectrum absorption technology: The principle of infrared spectrum absorption technology (also known as laser technology) is that SF6, as a greenhouse gas, has a strong absorption of infrared light at a certain wavelength.
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