Process for detecting sulfur hexafluoride (SF6) gas

Abstract

The invention relates to a method of measuring the leakage of sulfur hexafluoride, which uses the infrared spectral absorption method and has a high sensibility. The steps are: shining the SF6 sample pond or the point which tend to leak by the infrared light from the infrared source whose band is 1700cm-1,1620cm-1,900cm-1,610cm-1, spectral bandwidth is 2mum, measuring the change of the infrared spectral intensity by the photoelectric detector set on the other side of the measuring point, and getting the SF6 content of the measuring point. The certainty of the measurement is above one per million, the measuring distinguishability can reach to 0.1ppm, and it can increase the measuring certainty through setting low loss optical system and high sensibility photoelectric detector.

Description

Technical field [0001] The invention relates to a method for detecting sulfur hexafluoride gas, in particular to a method for detecting leakage of sulfur hexafluoride gas with high sensitivity by using an infrared spectrum absorption method. Background technique [0002] In the power system industry, sulfur hexafluoride (SF 6 ) as an important fire extinguishing insulation medium, is widely used in high voltage switchgear. However, the above devices inevitably encounter SF 6 Gas leakage problem, once the high voltage switchgear leaks SF 6 When the gas reaches the protective limit, major vicious accidents will occur, resulting in major economic losses and adverse social impacts. Therefore, in order to ensure safe production, SF used in high voltage switchgear 6 Leak detection equipment is critical. At present, the domestic and foreign markets are used to detect SF 6 There are many leaking equipment and methods, such as: (1) Corona discharge method, by detecting the cont...

AI Technical Summary

Problems solved by technology

At present, the domestic and foreign markets are used to detect SF 6 There are many leaking equipment and methods, such as: (1) Corona discharge method, by detecting the content of sulfur dioxide, indirectly judge the SF 6 Whether it leaks, the accuracy is not high

(2) Ultraviolet ionization method, this method has high detection accuracy, but the service life is only 500 hours

(3) Ultrasonic detection method, the detection sensitivity is low, only on the order of 1000ppm

(4) Semiconductor sensor detection, using the SF 6 The adsorption of SF by changing the conductivity 6 Leakage detection, although this method has a long service life, but the detection accuracy is low

(5) Infrared imaging technology detection, using infrared radiation to act on the leaking point, using infrared imaging technology to observe the leakage gas disturbance on the display, and judge whether there is leakage; the advantage of this method is that it can be detected remotely without contact, but its price Expensive, and can not achieve quantitative detection, in summary, the existing detection technology has some defects, can not meet the needs of safe production in the power industry