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SF6 decomposition multicomponent analysis system
Product model: SF6 - FTIR - 401
Origin: Germany
1. The SF6 features:
Sulfur hexafluoride (SF6) gas, by two French chemist Moissan and Lebeau synthesis in 1900. From about 60 s, SF6 gas as excellent insulation and arcing medium successfully applied in the high voltage switch and its equipment. Today, in the field of high pressure, ultra-high pressure and ultra-high voltage, SF6 gas almost become the only insulation circuit breaker and GIS and arcing medium.
2. The generation of SF6 decomposition:
When not pure, SF6 product containing high toxic and low sulfur, hydrogen fluoride, fluoride and other toxic gases.
The product of partial discharge, such as:
1) 2 sf6 + O2 - > 2 sof2 + 8 f (thionyl fluoride)
2) 2 sf6 + O2 - > 2 sof4 + 4 f (four sulfuryl fluoride)
3) the SF6 - SF4 + 2 f (sulfur tetrafluoride)
4) the SF6 - S + 6 f (S)
5) 2 sof4 so2f2 + O2 - > 2 + 4 f (sulfuryl fluoride)
6) SF4 + H2O - SOF2 + 2 hf (hf)
7) SOF4 + H2O - SO2F2 + 2 hf (hf)
8) SOF2 + H2O and SO2 + 2 hf (sulfur dioxide)
Partial discharge of SF6 decomposition will accelerate insulation aging and corrosion of metal surfaces, since the electrical equipment insulation degradation will directly lead to partial discharge, and even breakdown, shorten the service life of electrical equipment, the serious influence to the safe operation of electrical equipment
Before and after pictures of insulation materials in SF6 decomposition corrosion
Insulation material in SF6 decomposition table compression strength before and after corrosion
3. The partial discharge detection technology - chemical methods applied in partial discharge detection
SF6 decomposition method is used for SF6 inflatable electric power equipment fault diagnosis. Power system at home and abroad have been widely carried out power equipment SF6 decomposition species and content detection, through the technology has already found some electrical fault, especially in the application of partial discharge in GIS. But based on the limitation of the detection technology, at present based on the chemical sensor technology only can detect SO2, H2S, several basic material such as HF content and has considerable limitations. For example: SOF2; SF4; SOF4; SO2F2; S2F10; CO; COS. Materials such as SiF4 cannot be detected. But SOF4 decomposition is existence and equipment of a direct relationship between the partial discharge.
4. Infrared (FTIR) spectroscopy:
Since the 1970 s to the present in more than 30 years, Fourier transform infrared spectroscopy (FTIR) is developing very rapidly, as the continuous development of Fourier transform infrared spectroscopy, infrared spectrometer is in constant development, constantly updated. The emergence of new, advanced infrared spectrometer attachments, make the function of infrared spectrometer attachments constantly expanding, continuously improve performance, to make infrared spectrum technology is more widely used.
The infrared absorption spectrum analysis is to identify compounds and determine the common use of the molecular structure of matter. For a single component or components in the mixture can quantitative analysis, especially for some difficult to separate and no obvious characteristic peaks in ultraviolet, visible area of the sample and quantitative analysis is fast and convenient to complete.
Infrared spectroscopy is the study of the atoms in molecules of relative vibration, can be summed up in a chemical bond vibration. Different chemical bonds or functional groups, and its vibration level from the ground state transition to the energy for the excited state is different, so to absorb different infrared light. Material absorption of different infrared light, will appear in different wavelength absorption peaks, infrared spectrum was created. Infrared spectrum measurement in the area is located in the ~ 400 cm, 4000 cm - 1-1, or 2.5 mm to 25 mm
U in the same measure time, the signal-to-noise ratio of the Fourier transform infrared spectrometer and obviously increase the sensitivity.
Taken the scanning speed, Fourier transform infrared spectrometer can be measured in 1 seconds more than ir spectra.
Taken the luminous flux is big, can detect transmission, low sample to use a variety of accessories, such as diffuse, specular reflection and attenuated total reflection; In addition to detect samples of different forms, such as gas, solid, liquid, thin film and metal coating.
Taken the high resolution, easy to observe the fine structure of the gaseous molecules.
Taken the determination of wide spectral range, as long as the light source change accordingly, beam splitter and the detector configuration, you can get the whole in the infrared spectrum.
U wave Numbers of high precision, due to the high monochromaticity of He - Ne laser to control and measure the interference pattern and sampling, make high wavenumber spectrum calculated precision.
5. Infrared spectroscopy for SF6 decomposition multicomponent analysis:
Foreign SF6 gas decomposition research has been conducted for many years, and obtained considerable achievements. German chemical Dr. Dr. Mr Kurte and his leadership team after ten years of exploration and research, combined with infrared spectrum technology and the research of SF6 decomposition components, developed based on the infrared spectroscopy of SF6 decomposition multicomponent analysis system, and equipped with dedicated database system. The SF6 decomposition analysis equipment has been widely used in electric power engineering, has played an important role on power equipment fault diagnosis. Specific testing data and the detection limit to see the table below:
|
The serial number
|
decomposition
|
The minimum detection limit PPMV
|
序号 The serial number
|
decomposition
|
The minimum detection limit PPMV |
|
1 |
SO2 |
10 |
8 |
CO |
5 |
|
2 |
HF |
0.5 |
9 |
COS |
1 |
|
3 |
SOF2 |
5 |
10 |
SiF4 |
2 |
|
4 |
SF4 |
2 |
11 |
CO2 |
5 |
|
5 |
SOF4 |
3 |
12 |
CF4 |
2 |
|
6 |
SO2F2 |
1 |
13 |
H20 |
10 |
|
7 |
S2F10 |
2 |
|
|
|
FTIR - SF6 decomposition analysis system
FTIR - SF6 decomposition analysis system
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