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Infrared photoacoustic spectroscopy detection device and method for decomposed components of sulfur hexafluoride under partial discharge

A technology of infrared photoacoustics and sulfur hexafluoride, which is applied in the directions of measuring devices, color/spectral characteristic measurement, and material analysis, etc. It can solve problems such as unsuitable for on-site detection, increased measurement cost and difficulty, and measurement errors.

Inactive Publication Date: 2011-03-02
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] (1) Infrared spectrum detection is to detect the gas concentration by comparing the intensity change of the incident infrared light and the outgoing infrared light absorbed by the gas. The concentration of the decomposed components of sulfur hexafluoride is relatively small, generally 0.01 μL / L~10μL / L level, so the intensity of the incident infrared light and the outgoing infrared light after being absorbed by the decomposed gas has a small change, and the infrared detector currently used to detect the infrared light intensity is low in sensitivity, resulting in the infrared spectrum The detection sensitivity is low, even if the long gas cell described in this published patent is used, the sensitivity is only a few tenths of μL / L
[0005] (2) Due to the low detection sensitivity of infrared spectroscopy, to achieve a certain detection sensitivity, it is necessary to select the stronger infrared absorption peak of the decomposition component of locally released sulfur hexafluoride as the characteristic absorption peak. The components are relatively complex, and the infrared absorption peaks of each component overlap, which will cause cross interference during detection, which will greatly reduce the detection accuracy of infrared spectroscopy
[0006] (3) The temperature stability of the infrared detector used in infrared spectrum detection is poor, and the whole set of experimental equipment is only suitable for use in a constant temperature environment in the laboratory, and is not suitable for actual on-site detection
[0007] (4) The size of the spherical parabolic mirror used in this patent is 89mm*52mm and 60mm*25mm, and the surface area is relatively large (about 4628mm 2 and 1500mm 2 ), easy to cause measurement errors due to optical surface contamination, and the gas cell is a long optical path gas cell, the shape is a cylinder of Φ104mm*500mm, the volume of the gas cell is large (about 4.25L), and a large amount of sample gas is required for each measurement , increasing the cost and difficulty of measurement

Method used

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  • Infrared photoacoustic spectroscopy detection device and method for decomposed components of sulfur hexafluoride under partial discharge
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  • Infrared photoacoustic spectroscopy detection device and method for decomposed components of sulfur hexafluoride under partial discharge

Examples

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Embodiment 1

[0053] Such as Figure 1-3As shown, an infrared photoacoustic spectroscopic detection device for partially releasing the decomposition components of sulfur hexafluoride mainly includes an induction voltage regulator 1, a corona-free experimental transformer 2, a non-partial discharge protection resistor 3, and a standard capacitor voltage divider 4 , Non-inductive resistance 5, GIS analog components 6, broadband high-speed ultra-large capacity digital storage oscilloscope 7, infrared photoacoustic spectroscopy system 8, etc. The feature is: the infrared photoacoustic spectroscopy system 8 is mainly composed of a broad-spectrum infrared light source 9, a zinc selenide lens 10, a chopper 11, a chopper controller 12, a filter wheel 13, a filter 14, a selenium Zinc window 15, photoacoustic cell 16, thermocouple 17, thermocouple controller 18, pressure transmitter 19, microphone 20, signal cable 21, inlet valve 22, outlet valve 23, inlet pipe 24, outlet Air pipe 25, vacuum pump 26...

Embodiment 2

[0068] An infrared photoacoustic spectroscopic detection device that partially releases the decomposed components of sulfur hexafluoride, the same as in Example 1, wherein: the outer diameter of the cylinder of the photoacoustic cell 16 is 40mm, the length is 200mm, and the length of the resonant cavity is 80mm, The diameter is 6mm, the length of the cylindrical buffer air chamber at both ends of the resonant cavity is 40mm, and the inner diameter is 35mm. The inner diameter of the through hole at the bottom of the left buffer air chamber is 15mm, the inner diameter of the through hole at the cylinder below the left buffer air chamber is 1mm, the inner diameter of the through hole at the cylinder below the right buffer air chamber is 1mm, and the inner diameter of the through hole at the cylinder above the right buffer air chamber is The inner diameter of the through hole is 2mm, and the diameter of the through hole at the cylinder above the middle of the resonant cavity is 8mm...

Embodiment 3

[0070] An infrared photoacoustic spectroscopic detection device that partially releases the decomposed components of sulfur hexafluoride, the same as in Example 1, wherein: the outer diameter of the cylinder of the photoacoustic cell 16 is 60mm, the length is 230mm, and the length of the resonant cavity is 120mm, The diameter is 12mm, the length of the cylindrical buffer air chamber at both ends of the resonant cavity is 60mm, and the inner diameter is 45mm. The inner diameter of the through hole at the bottom of the left buffer air chamber is 25mm, the inner diameter of the through hole at the cylinder below the left buffer air chamber is 3mm, the inner diameter of the through hole at the cylinder below the right buffer air chamber is 3mm, and the inner diameter of the through hole at the cylinder above the right buffer air chamber The inner diameter of the through hole is 4mm, and the diameter of the through hole at the cylinder above the middle of the resonant cavity is 15mm...

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Abstract

The invention relates to an infrared photoacoustic spectroscopy detection device and method for decomposed components of sulfur hexafluoride under partial discharge, belonging to the technical field of partial discharge on-line monitoring of SF6 gas insulating electrical equipment. The device of the invention mainly comprises an induction voltage regulator, a corona free experimental transformer, a partial discharge free protective resistor, a standard capacitive voltage divider, a non-inductive resistor, a GIS analog element, a wide-frequency high-speed ultrahigh-capacity digital storage oscillograph and an infrared photoacoustic spectroscopy system. In the method of the invention, infrared photoacoustic spectroscopy detection is carried out on the decomposed gas of SF6 under partial discharge in the GIS analog element by the device of the invention. The invention has high sensitivity, little gas consumption, multiple detection components and strong anti-jamming capability, can effectively detect SF6, CF4, SO2F2, SOF2, SO2, HF and the like as low as 0.01 muL / L, and is suitable for on-line detection. The invention can be widely used for detection of partial discharge decomposed gas of SF6 in the SF6 gas insulating electrical equipment, especially the GIS equipment.

Description

technical field [0001] The present invention belongs to sulfur hexafluoride (SF 6 ) Partial discharge (PD) online monitoring technology field in gas-insulated electrical equipment, especially related to partial discharge (referred to as PD) under SF in GIS 6 An infrared photoacoustic spectroscopic detection device and method for decomposing components. Background technique [0002] Gas-insulated switchgear (GIS), in SF 6 As an insulating medium, gas has the advantages of high dielectric strength, stable operation, small footprint and small maintenance workload. It is more and more widely used in power systems, especially in the construction and renovation of large and medium-sized cities. However, judging from the operating conditions in recent years, many problems have occurred in the use of GIS at home and abroad, among which insulation faults are the main ones. The most common feature of insulation faults is that the insulating medium in GIS has localized faults before ...

Claims

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Application Information

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IPC IPC(8): G01N21/17G01N21/35G01N21/01G01N21/3504
Inventor 唐炬张晓星刘帆姚陈果朱黎明王有元孙才新
Owner CHONGQING UNIV
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