A device and method for detecting decomposition components of sulfur hexafluoride

Abstract

The present application discloses a device and method for detecting decomposition components of sulfur hexafluoride, and relates to the technical field of gas detection for electrical equipment. The device of the present application includes an ultraviolet light source and a fluorescent light source, the light beams emitted by the ultraviolet light source and the fluorescent light source are coupled through a fiber optic coupler, the output end of the fiber optic coupler is connected to a multimode optical fiber, and the coupled light beams are transmitted to a gas detection cell through the multimode optical fiber; a detector, a photoelectric conversion unit, a fiber optic amplifier, and a beam splitter are arranged in the gas detection cell. The device of the present application can filter out a narrow-band spectrum through the filtering effect of a gas buffer cell and an optical filter to avoid interference from absorption by other components in the gas to be detected; at the same time, the detector and the fiber optic amplifier are integrated in the detection cell, further reducing the size of the device, facilitating integration and carrying, and can be used for online detection applications.

Description

Technical Field

[0001] The present application relates to gas detection technology for electrical equipment, and more specifically, to a device and method for detecting decomposition components of sulfur hexafluoride. Background Art

[0002] There are inevitably some hidden defects lurking inside SF6 gas-insulated electrical equipment, such as burrs and impurities. Under long-term operation, latent defects will gradually develop into partial discharge or local overheating faults, seriously affecting the safe operation of gas-insulated electrical equipment. Existing studies have shown that gas-insulated electrical equipment will cause SF6 gas to decompose under partial discharge or local overheating faults, producing multiple decomposition components such as H2S, SO2, CS2, SOF2 and SO2F2. If such decomposition components can be accurately detected, the type of internal fault and its severity can be judged and evaluated. Summary of the invention

[0003] In view of this, in order to solve or improve the above-mentioned problems in the prior art, the present application proposes a device and method for detecting decomposition components of sulfur hexafluoride.

[0004] In order to achieve the above-mentioned purpose, the present application provides a sulfur hexafluoride decomposition component detection device, comprising an ultraviolet light source and a fluorescent light source, the light beams emitted by the ultraviolet light source and the fluorescent light source are coupled through an optical fiber coupler, the output end of the optical fiber coupler is connected to a multimode optical fiber, and the coupled light beams are transmitted to a gas detection cell through the multimode optical fiber; a detector, a photoelectric conversion unit, an optical fiber amplifier and a beam splitter are arranged in the gas detection cell, the beam splitter is used to split the ultraviolet light and the fluorescence and change the optical path, the optical fiber amplifier is connected to the beam splitter, the optical fiber amplifier is used to enhance the light energy of the ultraviolet light by using the fluorescence, the detector and the photoelectric conversion unit are respectively connected to the optical fiber amplifier, and the detector and the photoelectric conversion unit are both used to detect the optical information of the ultraviolet light.

[0005] Furthermore, a gas buffer pool is provided at the light beam incident end of the gas detection pool, and a gas inlet and a gas outlet are respectively provided on the side walls of the gas buffer pool, so that the coupled light beam can enter the gas detection pool through the gas buffer pool.

[0006] In other embodiments, a filter is provided between the gas buffer cell and the gas detection cell.

[0007] In other embodiments, an optical window is provided at the light beam incident end of the gas buffer cell.

[0008] Furthermore, the optical window is a calcium fluoride window.

[0009] In other solutions, a host computer is also included, and the host computer is electrically connected to the detector.

[0010] In other embodiments, an oscilloscope is also included, and the oscilloscope is electrically connected to the photoelectric conversion unit.

[0011] The present application also provides a method for detecting decomposition components of sulfur hexafluoride, including the device for detecting decomposition components of sulfur hexafluoride in any of the above schemes, and the method steps include:

[0012] S1. Pass the gas to be tested into the gas buffer tank through the air inlet for one minute. After the gas is uniform, close the air outlet first and then the air inlet;

[0013] S2, powering on the device, starting the ultraviolet light source and the fluorescent light source, so that the ultraviolet light beam and the fluorescent light beam are coupled through the optical fiber coupler and then transmitted to the gas detection pool through the multimode optical fiber and the gas buffer pool;

[0014] S3. After the data of the host computer and the oscilloscope are stable, the waveform of the amplified detection signal displayed by the oscilloscope is made to correspond to the data of the gas concentration detection module of the host computer.

[0015] Beneficial Effects

[0016] Compared with the prior art, the advantages of this technical solution are:

[0017] (1) This technical solution couples fluorescence and ultraviolet light through an optical fiber coupler based on the different wavelength ranges of fluorescence and ultraviolet light, which can not only avoid the interference of fluorescence on ultraviolet light, but also play the role of fluorescence amplification;

[0018] (2) This technical solution divides the gas pool into two parts, the left half is the gas buffer pool, and the right half is the gas detection pool. This can avoid the interference of gas flow rate on detection;

[0019] (3) This technical solution integrates the detector and the fiber amplifier in the detection cell, and uses a beam splitter to split the ultraviolet light and fluorescence and change the optical path, further reducing the size of the device, making it easier to integrate and carry;

[0020] (4) The oscilloscope of the present technical solution can display the waveform of the amplified detection signal, which corresponds to the data of the gas concentration detection module of the host computer, thereby avoiding detection errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the sulfur hexafluoride decomposition component detection device of the present application.

[0022] The main reference numerals in the figure are: 1. ultraviolet light source; 2. fluorescent light source; 3. optical fiber coupler; 4. multimode optical fiber; 5. calcium fluoride window; 6. air inlet; 7. air outlet; 8. filter; 9. beam splitter; 10. detector; 11. optical fiber amplifier; 12. photoelectric conversion unit; 13. oscilloscope; 14. host computer; 15. gas detection cell; 16. gas buffer cell. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0025] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0026] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0027] like Figure 1As shown, in order to accurately detect the decomposition components of sulfur hexafluoride, the present application provides a sulfur hexafluoride decomposition component detection device according to the wide wavelength of the ultraviolet light source 1, covering the molecular absorption spectrum of the decomposition components of sulfur hexafluoride, combined with the signal amplification function of the fluorescent light source 2, including an ultraviolet light source 1 and a fluorescent light source 2, the light beams emitted by the ultraviolet light source 1 and the fluorescent light source 2 are coupled through an optical fiber coupler 3, the output end of the optical fiber coupler 3 is connected to a multimode optical fiber 4, and the coupled light beams are transmitted to a gas detection cell 15 through the multimode optical fiber 4; a detector 10, a photoelectric conversion unit 12, an optical fiber amplifier 11 and a beam splitter 9 are arranged in the gas detection cell 15, the beam splitter 9 is used to split the ultraviolet light and the fluorescence and change the optical path, the optical fiber amplifier 11 is connected to the beam splitter 9, the optical fiber amplifier 11 is used to enhance the light energy of the ultraviolet light by using the fluorescence, the detector 10 and the photoelectric conversion unit 12 are respectively connected to the optical fiber amplifier 11, and the detector 10 and the photoelectric conversion unit 12 are both used to detect the optical information of the ultraviolet light. Since the photoluminescent material in the fluorescent optical fiber has a high energy conversion efficiency, the fluorescent optical fiber can be used to form an optical fiber amplifier 11, and the high conversion efficiency of fluorescence is used to amplify the signal light input into the optical fiber. In addition, the fluorescent optical fiber amplifier 11 is relatively low in price and small in size, and can be integrated inside the detection equipment. The embodiment of the present application uses an optical fiber coupling method to couple the fluorescent light beam and the ultraviolet light beam, and transmits them to the gas pool through the multimode optical fiber 4 for application in the detection of decomposition components of sulfur hexafluoride.

[0028] The present application divides the traditional gas pool into a gas detection pool 15 and a gas buffer pool 16, which can avoid the interference of gas flow rate on detection. The gas buffer pool 16 is arranged at the left end of the gas detection pool 15, that is, at the light beam incident end of the gas detection pool 15. The gas detection pool 15 integrates detection elements such as a detector 10, a photoelectric conversion unit 12, an optical fiber amplifier 11 and a beam splitter 9, further reducing the size of the device, facilitating integration and carrying; the detector 10 is equivalent to a spectrometer. According to the Beer-Lambert law, the intensity of the absorbed light is normal to the concentration of the measured gas. The detector 10 detects the main information such as the light intensity, and then converts it into an electrical signal of the gas concentration to be measured, and transmits the electrical signal to the host computer 14 to convert it into a digital signal; the optical fiber amplifier 11 mainly amplifies the detected signal. The optical fiber amplifier 11 amplifies the signal by increasing the light energy and transmits it to the photoelectric conversion unit 12. The photoelectric conversion unit 12 transmits the amplified signal to the oscilloscope 13 for display; the oscilloscope 13 can display the waveform of the amplified detection signal, which corresponds to the gas concentration detection module of the host computer 14. A filter 8 is provided between the gas buffer cell 16 and the gas detection cell 15. The light beam is filtered by the filter 8 to obtain ultraviolet light with a wavelength at the absorption peak of the gas to be measured, and enters the gas detection cell 15. A calcium fluoride window 5 is also provided at the front end of the gas buffer cell 16. The calcium fluoride window 5 has a high light transmittance for light of different wavelengths.

[0029] How it works

[0030] The faulty gas is introduced into the gas pool through the gas inlet 6, and the gas inlet 6 and the gas outlet 7 are closed after the gas is uniform.

[0031] After the device is powered on, the ultraviolet light beam and the fluorescent light beam are coupled through the optical fiber coupler 3 and transmitted to the buffer pool of the gas pool through the multimode optical fiber 4.

[0032] The light beam is filtered by the filter 8 to obtain ultraviolet light of the wavelength at the absorption peak of the gas to be measured, and enters the detection cell. The gas to be measured absorbs the ultraviolet light, and at the same time, the optical fiber amplifier 11 amplifies the signal by increasing the light energy and transmits it to the photoelectric conversion unit 12; the photoelectric conversion unit 12 transmits the amplified signal to the oscilloscope 13 for display.

[0033] The detector 10 receives the ultraviolet absorption spectrum signal and converts it into a photoelectric signal related to the gas concentration. The photoelectric signal is transmitted to the host computer 14, and the host computer 14 displays the information of the gas concentration.

[0034] According to the above-mentioned sulfur hexafluoride decomposition component detection device, the embodiment of the present application also provides a sulfur hexafluoride decomposition component detection method, the method steps include:

[0035] S1. Pass the gas to be tested into the gas buffer tank through the air inlet for one minute. After the gas is uniform, close the air outlet first and then the air inlet;

[0036] S2, powering on the device, starting the ultraviolet light source and the fluorescent light source, so that the ultraviolet light beam and the fluorescent light beam are coupled through the optical fiber coupler and then transmitted to the gas detection pool through the multimode optical fiber and the gas buffer pool;

[0037] S3. After the data of the host computer and the oscilloscope are stable, the waveform of the amplified detection signal displayed by the oscilloscope is made to correspond to the data of the gas concentration detection module of the host computer.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A sulfur hexafluoride decomposition component detection device, characterized in that: It includes an ultraviolet light source and a fluorescent light source, wherein the light beams emitted by the ultraviolet light source and the fluorescent light source are coupled through an optical fiber coupler, the output end of the optical fiber coupler is connected to a multimode optical fiber, and the coupled light beams are transmitted to a gas detection cell through the multimode optical fiber; The gas detection cell is provided with a detector, a photoelectric conversion unit, a fiber optic amplifier and a beam splitter. The beam splitter is used to split the ultraviolet light and fluorescence and change the optical path. The fiber optic amplifier is connected to the beam splitter. The fiber optic amplifier is used to enhance the light energy of the ultraviolet light by using fluorescence. The detector and the photoelectric conversion unit are respectively connected to the fiber optic amplifier. The detector and the photoelectric conversion unit are both used to detect the optical information of the ultraviolet light.

2. The sulfur hexafluoride decomposition component detection device according to claim 1, characterized in that: A gas buffer pool is provided at the light beam incident end of the gas detection pool, and a gas inlet and a gas outlet are respectively provided on the side walls of the gas buffer pool, so that the coupled light beam can enter the gas detection pool through the gas buffer pool.

3. The sulfur hexafluoride decomposition component detection device according to claim 2, characterized in that: A filter is arranged between the gas buffer pool and the gas detection pool.

4. The sulfur hexafluoride decomposition component detection device according to claim 2, characterized in that: An optical window is provided at the light beam incident end of the gas buffer pool.

5. The sulfur hexafluoride decomposition component detection device according to claim 4, characterized in that: The optical window piece is a calcium fluoride window piece.

6. The sulfur hexafluoride decomposition component detection device according to claim 1, characterized in that: It also includes a host computer, which is electrically connected to the detector.

7. The sulfur hexafluoride decomposition component detection device according to claim 1, characterized in that: An oscilloscope is also included, and the oscilloscope is electrically connected to the photoelectric conversion unit.

8. A method for detecting decomposition components of sulfur hexafluoride, characterized in that: The method comprises the device for detecting decomposition components of sulfur hexafluoride according to any one of claims 1 to 7, wherein the method comprises: S1. Pass the gas to be tested into the gas buffer tank through the air inlet for one minute. After the gas is uniform, close the air outlet first and then the air inlet; S2, powering on the device, starting the ultraviolet light source and the fluorescent light source, so that the ultraviolet light beam and the fluorescent light beam are coupled through the optical fiber coupler and then transmitted to the gas detection pool through the multimode optical fiber and the gas buffer pool; S3. After the data of the host computer and the oscilloscope are stable, the waveform of the amplified detection signal displayed by the oscilloscope is made to correspond to the data of the gas concentration detection module of the host computer.

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