A detection device for leakage of electric high-voltage equipment and its application

Abstract

The present invention provides a detection device for leakage of electric high-voltage equipment and its application. The detection device includes: a sampling unit, a carrier gas unit, a GC column and a detection unit. The sampling unit includes a first sampling pipeline, a quantitative loop, a control valve, a second sampling pipeline and a vacuum pump which are sequentially connected. The carrier gas unit includes a carrier gas pipeline, a pressure storage tank and a booster pump. The input end of the GC column is connected to the quantitative loop through a control valve. The detection unit includes an IMS detection system and an MS detection system, which are respectively connected to the output end of the GC column through a first injection pipeline and a second injection pipeline, and an injection solenoid valve is arranged on the second injection pipeline. The detection device in the present invention conveniently and quickly realizes single-mode and dual-mode switching of GC-IMS and MS through the interface of the sampling solenoid valve, thereby enhancing the environmental detection adaptability of the detection device and being able to realize SF detection of leakage of high-voltage equipment. 6 and SF 6 Decomposition products are tested in one stop.

Description

Technical Field

[0001] The invention belongs to the technical field of safety detection, and in particular relates to a device for leakage of electric high-voltage equipment and an application thereof. Background Art

[0002] SF6 (sulfur hexafluoride) has extremely strong negative charge, insulation and efficient arc extinguishing ability. It is one of the most important insulating media in the current power industry and has been widely used in high-voltage equipment such as high-voltage circuit breakers, gas-insulated substations (GIS), high-voltage transformers, high-voltage mutual inductors, and gas-insulated pipeline transmission lines. With the rapid development of the national economy and the continuous improvement of people's living standards, my country's power industry has developed by leaps and bounds, the number and scale of high-voltage power equipment has continued to increase, and the proportion of SF6 electrical equipment in new power equipment has become increasingly larger. As a result, the power sector has increasingly higher requirements for the reliability of SF6 equipment.

[0003] Pure SF6 has stable chemical properties and is a colorless, odorless, non-toxic and non-flammable inert gas at room temperature. SF6 leakage can lead to insufficient insulation of high-voltage systems, resulting in equipment damage and environmental pollution. The products of SF6 decomposition during the discharge process (CF4, CO, CO2, C2F6, C3F8, SO2F2, SOF2, SO2, H2S, COS, CS2, NF3, N2O, etc.) are often chemically active and toxic and corrosive, which not only endangers the safe and stable operation of power equipment but also threatens the lives of on-site workers.

[0004] With the in-depth understanding of the SF6 gas discharge decomposition mechanism, it has become possible to use gas composition analysis technology to provide data support for diagnosing potential faults of SF6 electrical equipment such as spark discharge, arc discharge, gap breakdown, corona, surface discharge, overheating faults, etc., to ensure the safe operation of the power grid.

[0005] Traditional SF6 gas leakage detection technologies mainly include negative corona, nonlinear infrared, laser imaging and other technologies; decomposition product detection technologies mainly include electrochemistry, gas chromatography, infrared absorption spectroscopy and other technologies. Gas chromatography technology is currently mainly used for laboratory analysis and is not suitable for on-site detection. At the same time, the detection time is relatively long during the actual operation process, and the separated substances may react during the subsequent analysis process, which greatly reduces the detection results. Electrochemistry and infrared absorption spectroscopy technologies are not suitable for mixed gas detection, and there are no infrared absorption sensors specifically for SO2 and H2S.

[0006] The detection technologies in the above-mentioned prior art can only detect SF6 leakage, or can only detect one or several specific components in SF6 decomposition products, and it is difficult to achieve one-stop detection of SF6 leakage and its decomposition products.

[0007] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0008] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a detection device for leakage of electric high-voltage equipment and its application, so as to solve the problem in the prior art that it is difficult to achieve one-stop detection of SF6 and SF6 decomposition products leaked from high-voltage equipment.

[0009] In order to achieve the above-mentioned object and other related objects, the present invention provides a detection device for leakage of electric high-voltage equipment, the detection device comprising:

[0010] A sampling unit, the sampling unit comprising a first sampling pipeline, a quantitative loop, a control valve, a second sampling pipeline and an air pump which are sequentially connected, the input end of the first sampling pipeline is connected to the interface of the high-pressure equipment pipeline, both ends of the quantitative loop are connected to the control valve, one end of the control valve is connected to the output end of the first sampling pipeline, and the other end is connected to the air pump through the second sampling pipeline, the air pump collects the sample in the high-pressure equipment pipeline into the quantitative loop, and the sample includes SF6 and / or SF6 decomposition products;

[0011] A carrier gas unit, wherein the carrier gas unit is connected to the quantitative loop through the control valve, and the carrier gas enters the quantitative loop and mixes with the sample to form a mixed sample;

[0012] A GC column, the input end of which is connected to the quantitative loop via the control valve, for pre-separating the mixed sample;

[0013] The detection unit comprises an IMS detection system and an MS detection system, the input ends of the IMS detection system and the MS detection system are respectively connected to the output end of the GC column through a first injection pipeline and a second injection pipeline, and an injection solenoid valve is arranged on the second injection pipeline, and the injection solenoid valve is used to control the on and off of the MS detection system.

[0014] Preferably, the detection equipment also includes a cleaning unit, which includes a cleaning gas circuit and a first filter device, the first filter device is connected to the second sampling pipeline, and a first solenoid valve is arranged between the first filter device and the second sampling pipeline; one end of the cleaning gas circuit is connected to the output end of the vacuum pump, and the other end is connected to the second sampling pipeline, and a second solenoid valve is arranged on the cleaning gas circuit; the first solenoid valve and the second solenoid valve are both two-position three-way valves.

[0015] Preferably, the control valve is a six-way valve.

[0016] Preferably, the GC column is one of an LTM-GC column, a Fast GC column, a multi-capillary chromatographic column or a capillary chromatographic column.

[0017] Preferably, the IMS detection system comprises an ion transfer tube, a Faraday cup and a circulating gas circuit unit;

[0018] The injection end of the ion transfer tube is connected to the output end of the GC column, the rear end of the ion transfer tube is connected to the Faraday cup, and the tube wall of the ion transfer tube is respectively provided with a first air inlet, a second air inlet and an exhaust port, the first air inlet and the second air inlet are respectively located at the front and rear ends of the ion transfer tube, and the exhaust port is located between the first air inlet and the second air inlet;

[0019] The circulating gas circuit unit includes a shock absorbing chamber, a circulation pump, and a second filtering device which are connected in sequence. The input end of the shock absorbing chamber is connected to the exhaust port. The gas discharged from the exhaust port passes through the shock absorbing chamber and the circulation pump in sequence and enters the second filtering device for filtration to form clean gas. The output end of the second filtering device is connected to the first air inlet and the second air inlet through pipelines through a multi-way interface.

[0020] Preferably, the carrier gas unit comprises a carrier gas pipeline, a pressure storage tank and a booster pump, one end of the pressure storage tank is connected to the booster pump, and the other end is connected to the input end of the carrier gas pipeline, the output end of the carrier gas pipeline is connected to the quantitative loop through a control valve, and the input end of the booster pump is connected to the second filtering device through the multi-pass interface. Preferably, the MS detection system comprises a quadrupole mass spectrometer, the quadrupole mass spectrometer comprises a vacuum chamber, an ion source assembly, a quadrupole assembly and a detection assembly, the vacuum chamber is connected to a vacuum pump group, the vacuum pump group comprises at least one diaphragm pump and at least one molecular pump, and the detection assembly comprises a Faraday cup and / or an electron multiplier.

[0021] According to any of the above-described detection devices for leakage of electric high-voltage equipment, the input end of the first sampling pipeline is connected to a sampling solenoid valve, and the other end of the sampling solenoid valve is connected to the interface of the high-voltage equipment pipeline.

[0022] According to any of the above detection devices for leakage of electric high-voltage equipment, the input end of the first sampling pipeline is connected to a sampling structure, and the sampling structure is a sampling cone or a sampling head;

[0023] The sampling cone has a conical structure, including a first port and a second port, a sampling cavity is connected between the first port and the second port, the first port and the high-pressure equipment pipeline are closely connected to each other, the second port is connected to the first sampling pipeline, and the inner diameter of the first port is larger than the inner diameter of the second port;

[0024] The sampling head is a pen-shaped sampling head, which includes a sampling end and a connecting end. The sampling end is tapered and the connecting end is tubular. One end of the sampling end in the tapered shape contacts the high-pressure equipment pipeline for collecting samples.

[0025] The present invention also provides an application of a detection device for leakage of electric high-voltage equipment, wherein the detection device is applied to SF6 leakage inspection of electric high-voltage equipment and / or online detection of SF6 decomposition products.

[0026] As described above, the detection device and method for leakage of electric high-voltage equipment of the present invention have the following beneficial effects:

[0027] The detection device of the present invention comprises a sampling unit, a carrier gas unit, a GC column and a detection unit, wherein the detection unit comprises an IMS detection system and an MS detection system, wherein the GC column and the IMS detection system form a GC-IMS mode, and the GC column and the MS detection system form a GC-MS mode, wherein the two modes are isolated by an injection solenoid valve, and the single-mode and dual-mode detection of GC-IMS and MS is conveniently and quickly realized through the interface of the sampling solenoid valve, thereby enhancing the environmental detection adaptability of the detection device, and realizing one-stop detection of SF6 and SF6 decomposition products leaked from high-voltage equipment; in addition, the detection sensitivity of the IMS detection system and the MS detection system are both higher than that of the SF6 decomposition product detection standards IEC 60480-2004 and GB / T The TCD gas chromatography method recommended by 18867-2002 is 3 to 4 orders of magnitude higher, and the IMS detection system and MS detection system have a strong response to SF6 and all decomposition products involved in SF6. The use of GC columns can pre-separate SF6 decomposition products and improve the cross-sensitivity of mixed sample detection. The use of IMS and MS detection systems as GC detectors can better meet the early warning of trace decomposition products of SF6 high-voltage equipment failures.

[0028] When full fault early warning monitoring is required, the detection equipment in the present invention can quickly integrate the MS detection system with the IMS detection system by opening the sampling solenoid valve, thereby realizing dual-mode detection of GC-IMS and GC-MS, and synchronously comparing the dual-mode detection results to improve the accuracy of the system monitoring results; when conducting SF6 leakage inspection of high-voltage equipment, the GC-IMS single mode can be used alone to realize the investigation of leakage points and the confirmation of on-site SF6 leakage concentration, and sampling structures with different structures can be used for intermittent sampling, injection, and detection to realize accurate positioning of the leakage range; the GC-IMS single mode can also be used to realize rapid detection of other faults except for the decomposition products CO and CO2 of SF6 due to overheating of high-voltage equipment.

[0029] The detection equipment in the present invention is also provided with a cleaning unit. After the last detection is completed, there will be residual samples in the quantitative ring and the control valve. During the next detection, in order to reduce interference during the detection process, the quantitative ring and the control valve need to be cleaned, thereby further improving the detection accuracy of the detection equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It shows a schematic diagram of the structure of a detection device used for SF6 leakage inspection of electric high-voltage equipment and online detection of SF6 decomposition products in a specific embodiment of the present invention.

[0031] Figure 2 It shows a schematic diagram of the inspection principle of SF6 and SF6 decomposition products leaked from electric high-voltage equipment using a detection device based on a GC column and an IMS detection system in single mode in specific embodiment 2 of the present invention.

[0032] Figure 3 It shows a schematic diagram of the principle of the detection equipment in the specific embodiment 3 of the present invention being used for detecting leakage and leakage point of SF6 high-pressure equipment pipeline.

[0033] Figure 4 It is a schematic diagram of the structure of the sampling cone in the specific embodiment 3 of the present invention.

[0034] Figure 5 It shows a schematic diagram of the structure of the sampling head in specific embodiment 3 of the present invention.

[0035] Component number description

[0036] 100 High-pressure equipment pipeline

[0037] 201 Sampling solenoid valve

[0038] 202 First sampling line

[0039] 203 Quantitative ring

[0040] 204 Control valve

[0041] 205 Second sampling line

[0042] 206 Vacuum Pump

[0043] 301 Carrier gas pipeline

[0044] 302 Pressure Storage Tank

[0045] 303 Booster Pump

[0046] 400 GC Column

[0047] 501 Ion Transfer Tube

[0048] 5011 First air inlet

[0049] 5012 Second air inlet

[0050] 5013 Exhaust port

[0051] 502 shock absorption chamber

[0052] 503 Circulation Pump

[0053] 504 Second Filter Device

[0054] 505 Multi-channel interface

[0055] 601 Injection Solenoid Valve

[0056] 602 Vacuum Chamber

[0057] 6021 Diaphragm Pump

[0058] 6022 Molecular Pump

[0059] 701 Clean gas line

[0060] 703 First Filter Device

[0061] 703 First solenoid valve

[0062] 704 Second solenoid valve

[0063] 801 Sampling Cone

[0064] 8011 First Port

[0065] 8012 Second port

[0066] 802 Sampling Head

[0067] 8021 Sampling Terminal

[0068] 8022 Connector DETAILED DESCRIPTION

[0069] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0070] See also Figures 1 to 5. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0071] The detection device of the present invention comprises a sampling unit, a carrier gas unit, a GC column and a detection unit, wherein the detection unit comprises an IMS detection system and an MS detection system, wherein the GC column and the IMS detection system form a GC-IMS mode, and the GC column and the MS detection system form a GC-MS mode, wherein the two modes are isolated by an injection solenoid valve, and the single-mode and dual-mode detection of GC-IMS and MS is conveniently and quickly realized through the interface of the sampling solenoid valve, thereby enhancing the environmental detection adaptability of the detection device, and realizing one-stop detection of SF6 and SF6 decomposition products leaked from high-voltage equipment; in addition, the detection sensitivity of the IMS detection system and the MS detection system are both higher than that of the SF6 decomposition product detection standards IEC 60480-2004 and GB / T 18867-2002, and the IMS detection system and the MS detection system have a strong response to SF6 and all the decomposition products involved in SF6. The use of a GC column can pre-separate the decomposition products of SF6, thereby improving the cross sensitivity of mixed sample detection. The use of IMS and MS detection systems as GC detectors can better meet the early warning of trace decomposition products of SF6 high-voltage equipment failures. The detection device of the present invention can quickly integrate the MS detection system with the IMS detection system by opening the sampling solenoid valve when full fault warning monitoring is required, thereby realizing dual-mode detection of GC-IMS and GC-MS, and synchronously comparing the dual-mode detection results, thereby improving the system The accuracy of the system monitoring results is improved; when conducting SF6 leakage inspection of high-voltage equipment, the GC-IMS single mode can be used alone to realize the investigation of leakage points and the confirmation of SF6 leakage concentration on site, and sampling structures with different structures can be used for intermittent sampling, injection and detection to realize the accurate positioning of the leakage range; the GC-IMS single mode can also be used to realize the rapid detection of other faults except the decomposition products CO and CO2 produced by the overheating of SF6 due to high-voltage equipment; the detection equipment in the present invention is also provided with a cleaning unit. After the last detection is completed, the sample will remain in the quantitative ring and the control valve. In the next detection, in order to reduce the interference in the detection process, the quantitative ring and the control valve need to be cleaned, which further improves the detection accuracy of the detection equipment.

[0072] Example 1

[0073] See also Figure 1 to Figure 3As shown, this embodiment provides a detection device for leakage of electric high-voltage equipment, the detection device comprising: a sampling unit, a carrier gas unit, a GC column 400 and a detection unit; wherein the sampling unit comprises a first sampling pipeline 200, a quantitative ring 203, a control valve 204, a second sampling pipeline 205 and an air pump 206 which are sequentially connected, the input end of the first sampling pipeline 200 is connected to the interface of the high-voltage equipment pipeline 100, both ends of the quantitative ring 203 are connected to the control valve 204, one end of the control valve 204 is connected to the output end of the first sampling pipeline 200, and the other end is connected to the air pump 206 through the second sampling pipeline 205, and the air pump 206 collects the sample in the high-voltage equipment pipeline 100 into the quantitative ring 203, the sample includes SF6 and / or SF6 decomposition products; the carrier gas unit is connected to the quantitative ring 203 through the control valve 204, and the carrier gas enters the quantitative ring 203 from the carrier gas pipeline 301 and mixes with the sample to form a mixed sample; the input end of the GC column 400 is connected to the quantitative ring 203 through the control valve 204, which is used for pre-separation of the mixed sample; the detection unit includes an IMS detection system and an MS detection system, the input ends of the IMS detection system and the MS detection system are respectively connected to the output end of the GC column 400 through the first injection pipeline and the second injection pipeline, and the second injection pipeline is provided with an injection solenoid valve 601, and the injection solenoid valve 601 is used to control the on and off of the MS detection system.

[0074] Specifically, high-voltage equipment refers to high-voltage circuit breakers, gas-insulated substations (GIS), high-voltage transformers, high-voltage mutual inductors, gas-insulated pipeline transmission lines and other high-voltage equipment. No excessive restrictions are made on the voltage range of the high-voltage equipment; and the high-voltage equipment pipelines 100 where SF6 is located in the electric power high-voltage equipment are all high-voltage pipelines with MPa level.

[0075] Specifically, the air pump 206 in this embodiment is a diaphragm pump.

[0076] The diaphragm pump uses a thin film to separate the pumped liquid from the piston and the pump cylinder, thereby protecting the piston and the pump cylinder. The part of the left side of the diaphragm that contacts the liquid is made of corrosion-resistant material or coated with a layer of corrosion-resistant material, and the right side of the diaphragm is filled with water or oil; the diaphragm pump, also known as the control pump, is the main type of actuator. It changes the fluid flow rate by receiving the control signal output by the regulating control unit and using power operation; the role of the diaphragm pump in the control process is to receive the control signal of the regulator or computer, change the flow rate of the regulated medium, and maintain the regulated parameters within the required range, thereby achieving automation of the production process; but the specific model and power size of the diaphragm pump used in this embodiment are not overly restricted here.

[0077] As an example, the detection equipment also includes a cleaning unit, which includes a cleaning gas circuit 701 and a first filter device 703, the first filter device 703 is connected to the second sampling pipeline 205, and a first solenoid valve 703 is arranged between the first filter device 703 and the second sampling pipeline 205; one end of the cleaning gas circuit 701 is connected to the output end of the vacuum pump 206, and the other end is connected to the second sampling pipeline 205, and a second solenoid valve 704 is arranged on the cleaning gas circuit 701.

[0078] Preferably, the first solenoid valve 703 and the second solenoid valve 704 are both two-position three-way valves.

[0079] Preferably, the first filter device 703 is filled with molecular sieve or activated carbon. Figure 1 As shown, a three-way interface is set on the second sampling pipeline 205, which are the first interface, the second interface and the third interface respectively. The first interface and the second interface connect the control valve 204 and the air pump 206. One end of the clean air circuit 701 is connected to the air pump 206, and the other end is connected to the third interface; and the first solenoid valve 703 is set between the second interface and the air pump 206, and the second solenoid valve 704 is set between the third interface and the air pump 206.

[0080] In this embodiment, after the last detection, the sample will remain in the quantitative ring 203 and the control valve 204. In order to reduce interference during the next detection, the quantitative ring 203 and the control valve 204 need to be cleaned. Figure 1 As shown in the figure, the first solenoid valve 703 and the second solenoid valve 704 are both connected to the 1st position, and the vacuum pump 206 is started. The ambient gas in the high-pressure equipment pipeline 100 is filtered by the first filter device 703 to form a clean gas. The clean gas passes through the vacuum pump 206 and the clean gas path 701, and then flows through the quantitative ring 203 and the control valve 204 through the three-way interface, thereby achieving the cleaning of the entire sampling unit.

[0081] As an example, the control valve 204 is a six-way valve.

[0082] Specifically, the six-way valve has 6 interfaces, see Figure 1 As shown, the interface from the upper left corner is interface 1, and in clockwise direction, interfaces 2, 3, 4, 5, and 6 are provided in sequence; in this embodiment, refer to Figure 1As shown, the output end of the first sampling pipeline 200 is connected to the interface No. 2, the input end of the second sampling pipeline 205 is connected to the interface No. 1, the input end of the quantitative ring 203 is connected to the interface No. 3, and the output end is connected to the interface No. 6, the GC column 400 is connected to the interface No. 5 of the six-way valve, and the output end of the carrier gas pipeline 301 is connected to the interface No. 4. When quantitative sample collection is required, the interface No. 2 of the six-way valve is connected to the interface No. 3, the interface No. 1 is connected to the interface No. 6, and the interface No. 4 is connected to the interface No. 5; when injection is required, the interface No. 1 of the six-way valve is connected to the interface No. 2, the interface No. 3 is connected to the interface No. 4, and the interface No. 5 is connected to the interface No. 6.

[0083] In addition, the control valve may also be other valves with sample quantification and sampling and injection switching functions. The specific structure of the valve is not excessively restricted here.

[0084] As an example, the GC (Gas Chromatography) column is one of an LTM-GC (Low Thermal Mass Gas Chromatography) column, a Fast GC (Fast Gas Chromatography) column, a multi-capillary chromatography column or a capillary chromatography column.

[0085] Specifically, the GC (Gas Chromatography) column is a gas chromatography column, which is used to analyze and detect the components in a mixed sample. The mixed sample is brought in by a carrier gas, and the mixed sample is pre-separated based on the difference in retention time of different components in the mixed sample. The separated components are sequentially introduced into the detection unit to obtain the detection signal of each component, and then the components can be distinguished by comparison according to the order in which the components in the mixed sample are introduced into the detection unit, and then the content of each component is calculated according to the peak height and peak area. In this embodiment, the GC column 400 pre-separates the decomposition products of SF6, and the pre-separated samples are respectively introduced into the IMS detection system and the MS detection system for detection, thereby improving the cross sensitivity of the mixed sample detection.

[0086] In this embodiment, in order to improve the detection speed and portability of the entire detection equipment, preferably, the GC column 400 is a Fast GC column 400 or a multi-capillary chromatographic column, but there is no excessive restriction on the specific use conditions, model size, etc. of the GC column 400, as long as it can meet the actual application.

[0087] As an example, the IMS detection system includes an ion transfer tube 501, a Faraday cup and a circulating gas circuit unit; the injection end of the ion transfer tube 501 is connected to the output end of the GC column 400, the rear end of the ion transfer tube 501 is connected to the Faraday cup, and the tube wall of the ion transfer tube 501 is respectively provided with a first air inlet 5011, a second air inlet 5012 and an exhaust port 5013, the first air inlet 5011 and the second air inlet 5012 are respectively located at the front and rear ends of the ion transfer tube 501, and the exhaust port 5013 is located between the first air inlet 5011 and the second air inlet 5012; the circulating gas circuit unit includes a shock absorbing chamber 502, a circulating pump 503, and a second filter device 504 which are arranged in sequence. The input end of the shock absorbing chamber 502 is connected with the exhaust port 5013. The gas discharged from the exhaust port 5013 passes through the shock absorbing chamber 502 and the circulating pump 503 in sequence and enters the second filter device 504 for filtration to form clean gas. The clean gas is discharged from the output end of the second filter device 504. The output end of the second filter device 504 is connected with the first air inlet 5011 and the second air inlet 5012 through pipelines through a multi-way interface.

[0088] Specifically, the mixed sample after pre-separation enters the ion migration tube 501 and first enters the ionization zone. The ion source in the ionization zone ionizes it into molecular ions. The mixed ions are introduced into the reaction zone through the electric field and the molecular ions are fully reacted. Then, the ions migrate in the migration zone and are received by the Faraday cup. After IV conversion, amplification, and AD conversion by the amplifier circuit, the test sample composition and concentration information are presented on the terminal after data processing and comparison.

[0089] At the same time, the circulation pump 503 is turned on, and the gas in the ion migration tube is discharged from the exhaust port 5013. The gas discharged from the exhaust port 5013 passes through the shock absorption chamber 502 and the circulation pump 503 in turn and enters the second filter device 504 for filtration to form clean gas. A part of the formed clean gas enters the ion migration tube from the first air inlet 5011 as ion migration injection gas, and a part of the formed clean gas enters the ion migration tube from the second air inlet 5012 as migration gas. The ion migration injection gas mainly serves to accelerate the ion migration speed and improve the sensitivity of the ion migration tube. The migration gas can effectively prevent the charged ions in the ion migration tube from agglomerating with the uncharged neutral gas, thereby further improving the detection accuracy.

[0090] Specifically, the circulation pump 503 is preferably a diaphragm pump.

[0091] As an example, the carrier gas unit includes a carrier gas pipeline 301, a pressure storage tank 302 and a boost pump 303, one end of the pressure storage tank 302 is connected to the boost pump 303, and the other end is connected to the input end of the carrier gas pipeline 301, the output end of the carrier gas pipeline 301 is connected to the quantitative ring 203 through a control valve, and the input end of the boost pump 303 is connected to the second filtering device 504 through a multi-channel interface 505.

[0092] Specifically, in the present embodiment, preferably, the multi-way interface 505 is a five-way interface, one interface is connected to the second filtering device 504, two interfaces are respectively connected to the first air inlet 5011 and the second air inlet 5012 through pipelines, one interface is connected to the boosting pump 303, and the remaining interface is directly connected to the air; in other embodiments, the multi-way interface can also be a six-way interface, a seven-way interface, etc., and the specific number of interfaces is not excessively restricted here.

[0093] Specifically, the booster pump is preferably a diaphragm pump.

[0094] As an example, the MS detection system includes a quadrupole mass spectrometer, which includes a vacuum chamber 602, an ion source assembly, a quadrupole assembly and a detection assembly. The vacuum chamber is connected to a vacuum pump group, which includes at least one diaphragm pump 6021 and at least one molecular pump 6022. The detection assembly includes a Faraday cup and / or an electron multiplier.

[0095] Specifically, the vacuum pump group uses a diaphragm pump 6021 as a front pump, and a molecular pump 6022 as a high vacuum pump for the entire MS detection system, which can quickly achieve cold start, effectively reduce the cost and volume of the MS detection system, and effectively detect trace amounts of small molecules such as H2, N2, O2 in SF6 decomposition products; wherein, the molecular pump 6022 is a small molecular pump 6022, and no excessive restrictions are made here on the specific models of the diaphragm pump 6021 and the molecular pump 6022.

[0096] As an example, the input end of the first sampling pipeline 200 is connected to a sampling solenoid valve 201 , and the other end of the sampling solenoid valve 201 is connected to the interface of the high-pressure equipment pipeline 100 . The sampling solenoid valve 201 is used to control the on-off of the first sampling pipeline 200 .

[0097] Preferably, the sampling solenoid valve 201 is a high-pressure solenoid valve; preferably, the sampling solenoid valve 201 is a two-way valve.

[0098] Specifically, the sampling solenoid valve 201 is disposed at the front end of the first sampling pipeline 200 and is used for connecting to the interface of the high-pressure equipment pipeline 100 .

[0099] In order to better understand the detection device for leakage of electric high-voltage equipment in this embodiment, this embodiment also provides a detection method for leakage of electric high-voltage equipment, which uses the above detection device for detection. In this embodiment, when SF6 high-voltage equipment inspection or online detection is required, the above detection device is applied to SF6 leakage inspection of electric high-voltage equipment and / or online detection of SF6 decomposition products.

[0100] The specific detection method includes the following steps:

[0101] S1. Open the interface switch of the SF6 high-pressure equipment pipeline 100, the sample enters the pipeline at the front end of the sampling solenoid valve 201, open the sampling solenoid valve 201 and the air pump 206, and the internal environmental gas of the SF6 high-pressure equipment flows through the first sampling pipeline, the six-way valve, the quantitative ring 203, the 0 position of the first solenoid valve 703, the air pump 206, and is discharged to the 0 position interface of the second solenoid valve 704; wherein, at this time, the No. 2 interface of the six-way valve is connected with the No. 3 interface, the No. 1 interface is connected with the No. 6 interface, and the No. 4 interface is connected with the No. 5 interface;

[0102] S2, after the gas atmospheres in the first sampling pipeline 200 and the second sampling pipeline 205 in the entire sampling unit are consistent (usually, the internal ambient gas of the SF6 high-pressure equipment is exhausted from the 0 position of the second solenoid valve 704 for 5 seconds), close the sampling solenoid valve 201;

[0103] S3, the six-way valve is quickly switched to the injection state, and quantitative sample collection is completed in the quantitative ring 203, the carrier gas enters the quantitative ring 203 and mixes with the sample to form a mixed sample, the mixed sample enters the GC column 400, and the mixed sample is pre-separated by the GC column 400; wherein, at this time, the No. 1 interface of the six-way valve is connected with the No. 2 interface, the No. 3 interface is connected with the No. 4 interface, and the No. 5 interface is connected with the No. 6 interface;

[0104] S4. Open the injection solenoid valve 601, and the pre-separated samples enter the IMS detection system and the MS detection system respectively. After separation, the gas molecules form molecular ions under the action of the ion sources of the IMS detection system and the MS detection system respectively, pass through the migration zone or the quadrupole assembly, and are finally received by the Faraday cup and / or the electron multiplier. After IV conversion, amplification, and AD conversion by the amplifier circuit, and after data processing and comparison, the test sample composition and concentration information are presented on the terminal.

[0105] Example 2

[0106] This embodiment provides a detection device for leakage of electric high-voltage equipment. The detection device is the same as the detection device in Example 1 and will not be described in detail here.

[0107] In this embodiment, when it is necessary to use the IMS detection system alone to inspect or detect SF6 and SF6 decomposition products leaking from electric high-voltage equipment, the detection equipment in this embodiment is used to detect them. The specific detection method is compared with the detection method for inspecting or online detecting SF6 high-voltage equipment in Example 1. In step S4, the injection solenoid valve 601 is always in a closed state, and all pre-separated samples enter the IMS detection system for detection. Steps S1, S2, and S3 are exactly the same and will not be repeated here.

[0108] Example 3

[0109] This embodiment provides a detection device for leakage of electric high-voltage equipment. Compared with the detection device in Example 1, the difference between the detection device and the detection device is that the sampling solenoid valve 201 connected to the input end of the first sampling pipeline 200 is replaced with a sampling structure, and the other structures are the same as those in Example 1 and will not be repeated here.

[0110] As an example, the sampling structure is a sampling cone 801 or a sampling head 802; see Figure 4 , Figure 5 The sampling cone 801 has a conical structure, including a first port 8011 and a second port 8012. A sampling cavity is connected between the first port 8011 and the second port 8012. The first port 8011 and the high-pressure equipment pipeline 100 are closely connected to each other, and the second port 8012 is connected to the first sampling pipeline 200. The inner diameter of the first port 8011 is greater than the inner diameter of the second port 8012. The sampling head 802 is a pen-shaped sampling head 802, and the pen-shaped sampling head 802 includes a sampling end 8021 and a connecting end 8022. The sampling end 8021 is in a conical conical shape, and the connecting end 8022 is in a tubular shape. One end of the sampling end 8021 in a conical shape contacts the high-pressure equipment pipeline 100 for collecting samples.

[0111] Specifically, when it is necessary to detect leakage and leakage points of the SF6 high-pressure equipment pipeline 100, sampling can be carried out using the sampling cone 801 first. The first port 8011 of the sampling cone 801 is in contact with the high-pressure equipment pipeline 100, and a preliminary judgment of the leakage area is made through sampling, injection and detection; then the sampling cone 801 is replaced with a pen-shaped sampling head 802, and through intermittent sampling and injection operations, when the detection equipment indicates that the SF6 sampling detection concentration has increased significantly, the leakage point range can be determined.

[0112] See also Figure 3 As shown, in this embodiment, when it is necessary to detect the leakage and leakage point of the SF6 high-voltage equipment pipeline 100, the detection device provided in this embodiment is used to detect the leakage and leakage point of the SF6 high-voltage equipment pipeline 100. The specific detection method includes the following steps:

[0113] S1. Detect the background concentration of SF6 in the environment where the high-pressure equipment pipeline 100 is located. Specifically, connect the sampling cone 801 to the front end of the first sampling pipeline, turn on the vacuum pump 206, and the sample gas leaked from the high-pressure equipment pipeline 100 flows through the six-way valve into the quantitative ring 203 through the first sampling structure under the driving action of the vacuum pump 206. By controlling the switching of the six-way valve, sampling, injection and detection are achieved; wherein, the background concentration of SF6 in the environment is detected, on the one hand, used to judge the safety of the detection environment, and on the other hand, used for equipment calibration;

[0114] S2. Replace the sampling cone 801 with a pen-shaped sampling head 802. Figure 3As shown, the sampling end 8021 of the pen-shaped sampling head 802 is placed close to the SF6 high-pressure equipment pipeline 100 for intermittent sampling, injection and detection operations. When the detection equipment indicates that the SF6 sampling detection concentration is significantly increased, the leakage point range can be determined;

[0115] Specifically, the methods of sampling, injection and detection in the above steps S1 and S2 are the same as those in Example 1 and will not be repeated here.

[0116] In summary, the detection device in the present invention includes a sampling unit, a carrier gas unit, a GC column and a detection unit. The detection unit includes an IMS detection system and an MS detection system. The GC column and the IMS detection system form a GC-IMS mode, and the GC column and the MS detection system form a GC-MS mode. The two modes are isolated by an injection solenoid valve. The single-mode and dual-mode detection of GC-IMS and MS are conveniently and quickly realized through the interface of the sampling solenoid valve, thereby enhancing the environmental detection adaptability of the detection device and being able to realize one-stop detection of SF6 and SF6 decomposition products leaked from high-voltage equipment. In addition, the detection sensitivity of the IMS detection system and the MS detection system are both higher than that of the SF6 decomposition product detection standards IEC 60480-2004 and GB / T 18867-2002, and the IMS detection system and the MS detection system have a strong response to SF6 and all the decomposition products involved in SF6. The use of a GC column can pre-separate the decomposition products of SF6, thereby improving the cross sensitivity of mixed sample detection. The use of IMS and MS detection systems as GC detectors can better meet the early warning of trace decomposition products of SF6 high-voltage equipment failures. The detection device of the present invention can quickly integrate the MS detection system with the IMS detection system by opening the sampling solenoid valve when full fault warning monitoring is required, thereby realizing dual-mode detection of GC-IMS and GC-MS, and synchronously comparing the dual-mode detection results, thereby improving the system The accuracy of the system monitoring results; when conducting SF6 leakage inspection of high-voltage equipment, the GC-IMS single mode can be used alone to realize the investigation of leakage points and the confirmation of SF6 leakage concentration on site, and at the same time, sampling structures with different structures can be used for intermittent sampling, injection, and detection to realize the accurate positioning of the leakage range; the GC-IMS single mode can also be used to realize the rapid detection of other faults except the decomposition products CO and CO2 produced by the overheating of SF6 due to high-voltage equipment; the detection equipment in the present invention is also provided with a cleaning unit. After the last detection is completed, the sample will remain in the quantitative ring and the control valve. In the next detection, in order to reduce the interference in the detection process, the quantitative ring and the control valve need to be cleaned, which further improves the detection accuracy of the detection equipment. Therefore, the present invention effectively overcomes the various shortcomings in the prior art and has a high industrial utilization value.

[0117] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A detection device for leakage of electric high-voltage equipment, characterized in that: The detection equipment comprises: A sampling unit, the sampling unit comprising a first sampling pipeline, a quantitative loop, a control valve, a second sampling pipeline and an air pump which are sequentially connected, the input end of the first sampling pipeline is connected to the interface of the high-pressure equipment pipeline, both ends of the quantitative loop are connected to the control valve, one end of the control valve is connected to the output end of the first sampling pipeline, and the other end is connected to the air pump through the second sampling pipeline, the air pump collects the sample in the high-pressure equipment pipeline into the quantitative loop, and the sample includes SF6 and / or SF6 decomposition products; A carrier gas unit, wherein the carrier gas unit is connected to the quantitative loop through the control valve, and the carrier gas enters the quantitative loop and mixes with the sample to form a mixed sample; A GC column, the input end of which is connected to the quantitative loop via the control valve, for pre-separating the mixed sample; A detection unit, wherein the detection unit comprises an IMS detection system and an MS detection system, wherein the input ends of the IMS detection system and the MS detection system are respectively connected to the output end of the GC column through a first injection pipeline and a second injection pipeline, and an injection solenoid valve is provided on the second injection pipeline, and the injection solenoid valve is used to control the on and off of the MS detection system; The IMS detection system includes an ion migration tube, a Faraday cup and a circulation gas circuit unit; The injection end of the ion transfer tube is connected to the output end of the GC column, the rear end of the ion transfer tube is connected to the Faraday cup, and the tube wall of the ion transfer tube is respectively provided with a first air inlet, a second air inlet and an exhaust port, the first air inlet and the second air inlet are respectively located at the front and rear ends of the ion transfer tube, and the exhaust port is located between the first air inlet and the second air inlet; The circulating gas circuit unit comprises a vibration absorbing chamber, a circulation pump, and a second filter device which are sequentially connected. The input end of the vibration absorbing chamber is connected to the exhaust port. The gas discharged from the exhaust port sequentially passes through the vibration absorbing chamber and the circulation pump and enters the second filter device for filtration to form clean gas. The output end of the second filter device is connected to the first air inlet and the second air inlet through a multi-pass interface through pipelines. The MS detection system includes a quadrupole mass spectrometer, which includes a vacuum chamber, an ion source assembly, a quadrupole assembly and a detection assembly. The vacuum chamber is connected to a vacuum pump group, which includes at least one diaphragm pump and at least one molecular pump. The detection assembly includes a Faraday cup and / or an electron multiplier.

2. The detection device for leakage of electric high-voltage equipment according to claim 1, characterized in that: The detection device further includes a cleaning unit, the cleaning unit includes a cleaning gas circuit and a first filter device, the first filter device is connected to the second sampling pipeline, and a first solenoid valve is provided between the first filter device and the second sampling pipeline; one end of the cleaning gas circuit is connected to the output end of the vacuum pump, and the other end is connected to the second sampling pipeline, and a second solenoid valve is provided on the cleaning gas circuit; The first solenoid valve and the second solenoid valve are both two-position three-way valves.

3. The detection device for leakage of electric high-voltage equipment according to claim 1, characterized in that: The control valve is a six-way valve.

4. The detection device for leakage of electric high-voltage equipment according to claim 1, characterized in that: The GC column is one of an LTM-GC column, a Fast GC column, a multi-capillary chromatographic column or a capillary chromatographic column.

5. The detection device for leakage of electric high-voltage equipment according to claim 1, characterized in that: The carrier gas unit includes a carrier gas pipeline, a pressure storage tank and a booster pump. One end of the pressure storage tank is connected to the booster pump, and the other end is connected to the input end of the carrier gas pipeline. The output end of the carrier gas pipeline is connected to the quantitative loop through a control valve, and the input end of the booster pump is connected to the second filtering device through the multi-pass interface.

6. The detection device for leakage of electric high-voltage equipment according to any one of claims 1 to 5, characterized in that: The input end of the first sampling pipeline is connected to a sampling solenoid valve, and the other end of the sampling solenoid valve is connected to the interface of the high-pressure equipment pipeline.

7. The detection device for leakage of electric high-voltage equipment according to any one of claims 1 to 5, characterized in that: The input end of the first sampling pipeline is connected to a sampling structure, and the sampling structure is a sampling cone or a sampling head; The sampling cone has a conical structure, including a first port and a second port, a sampling cavity is connected between the first port and the second port, the first port and the high-pressure equipment pipeline are closely connected to each other, the second port is connected to the first sampling pipeline, and the inner diameter of the first port is larger than the inner diameter of the second port; The sampling head is a pen-shaped sampling head, which includes a sampling end and a connecting end. The sampling end is tapered and the connecting end is tubular. One end of the sampling end in the tapered shape contacts the high-pressure equipment pipeline for collecting samples.

8. An application of a detection device for leakage of electric high-voltage equipment, characterized in that: The detection device described in claim 6 or 7 is applied to SF6 leakage inspection of electric high-voltage equipment and / or online detection of SF6 decomposition products.

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