Device and method for detecting SF6 decomposed gas by spectrum absorption optical fiber sensor

A fiber optic sensor and spectral absorption technology, which is applied in the direction of color/spectral characteristic measurement, etc., can solve the problem of affecting the detection accuracy and precision, cannot ensure that the chopper reference signal sampling signal frequency tends to be consistent, and the detection signal is susceptible to noise interference And other issues

Active Publication Date: 2012-06-20
CHONGQING UNIV
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Problems solved by technology

[0005] (1) The light source used in this device is a broad-spectrum infrared light source. Since the range of the spectrum is relatively large, a filter is used to filter out the specific light required to excite the photoacoustic signal. Wavelength, the operation is more cumbersome, in addition, a specific laser sheet needs to be customized, and the filtering effect and stability are poor
[0006] (2) The lock-in amplifier needs a reference signal in the process of detecting the photoacoustic signal, so the chopper is installed in the patent to output a reference signal, which cannot ensure the chopper The frequency of the reference signal output by the oscilloscope tends to be consistent with the frequency of the sampling signal, that is, the resonance cannot be guaranteed to produce a photoacoustic signal for detection, which affects the accuracy and precision of detection
[0007] (3) The signal detected by this method is a photoacoustic signal. Since the signal is relatively weak, although the patent is equ

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  • Device and method for detecting SF6 decomposed gas by spectrum absorption optical fiber sensor
  • Device and method for detecting SF6 decomposed gas by spectrum absorption optical fiber sensor
  • Device and method for detecting SF6 decomposed gas by spectrum absorption optical fiber sensor

Examples

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Embodiment 1

[0058] like figure 1 , 2 、 As shown in 3, a spectral absorption optical fiber sensor detects SF 6 The device for decomposing gas mainly includes induction voltage regulator 1, non-halo experimental transformer 2, non-partial discharge protection resistor 3, standard capacitor voltage divider 4, GIS analog component 5, non-inductive resistor 6, oscilloscope 10, and spectral absorption optical fiber sensor. The primary side of the induction voltage regulator 1 is connected to the 220V / 50Hz mains through a wire, the secondary side of the induction voltage regulator 1 is connected to the primary side of the non-halo experimental transformer 2 through a wire, and the non-partial discharge protection resistor 3 is separated from the standard capacitor through a wire. After the voltage transformer 4 is connected in series, it is connected in parallel with the secondary side of the non-halo experimental transformer 2. After the GIS analog element 5 is connected in series with the no...

Embodiment 2

[0071] A Spectral Absorption Optical Fiber Sensor to Detect SF 6 The device for decomposing gas is the same as in Example 1, wherein: the length of the shell 19 is 200mm, the width is 110mm, the height is 50mm, and the wall thickness is 4mm; one end on the side of the shell 19 is provided with a diameter of 6mm through hole ; A through hole with a diameter of 6mm is set at the other end on the corresponding other side of the housing 19; on the bottom surface in the housing 19, an insulating plate with a thickness of 5 mm is affixed.

Embodiment 3

[0073] A Spectral Absorption Optical Fiber Sensor to Detect SF 6 The device for decomposing gas is the same as in Example 1, wherein: the length of the shell 19 is 250mm, the width is 130mm, the height is 70mm, and the wall thickness is 5mm; one end on the side of the shell 19 is provided with a diameter of 8mm through hole ; A through hole with a diameter of 8mm is set at the other end on the corresponding other side of the housing 19; on the bottom surface in the housing 19, an insulating plate with a thickness of 8mm is affixed.

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Abstract

A device and a method for detecting SF6 decomposed gas by a spectrum absorption optical fiber sensor belong to the technical field of SF6 gas insulated electrical equipment partial discharge on-line monitoring. The device of the invention mainly comprises an induction voltage regulator, a non-corona experimental transformer, a non-partial discharge protective resistor, a standard capacitive voltage divider, a GIS simulation element, a non-inductance resistor, an oscilloscope, a spectrum absorption optical fiber sensor, and the like; The method of the invention performs experiment of standard gases with different concentrations of SF6 decomposed gas and absorption properties of absorbance under partial discharge in the GIS simulation element at a constant wavelength by using the device of the invention. The device of the invention has the characteristics of small size, simple structure, less coupling loss, convenient operation, rapid response time, high detection accuracy, high precision, etc. The invention is widely applicable to SF6 gas insulated electrical equipment, and especially to the detection of SF6 partial discharge decomposed gas in GIS equipment.

Description

technical field [0001] The invention belongs to SF 6 The field of on-line monitoring of partial discharge decomposition gas in gas-insulated electrical equipment, specifically relates to the detection of SF of partial discharge in GIS by spectral absorption optical fiber sensor 6 Device and method for decomposing gas. Background technique [0002] SF 6 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, and has been more and more widely used in the construction and renovation of large and medium-sized cities. However, from the point of view of actual operation, there are many problems in the use of GIS, among which insulation fault is the main one. The most common feature of insulation fault is: partial discharge occurs before the complete breakdown of the insulating medium in GIS. Under the action of partial discharge, SF 6 The gas decompo...

Claims

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Application Information

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IPC IPC(8): G01N21/39
Inventor 张晓星唐炬冯波周倩谢彦斌陈伟根李剑
Owner CHONGQING UNIV
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