CN109490204B - Device integrating discharge simulation and discharge decomposition gas monitoring - Google Patents
Device integrating discharge simulation and discharge decomposition gas monitoring Download PDFInfo
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- CN109490204B CN109490204B CN201811534145.4A CN201811534145A CN109490204B CN 109490204 B CN109490204 B CN 109490204B CN 201811534145 A CN201811534145 A CN 201811534145A CN 109490204 B CN109490204 B CN 109490204B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1218—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using optical methods; using charged particle, e.g. electron, beams or X-rays
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
- G01N2021/1704—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids in gases
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Abstract
A device integrating discharge simulation and discharge decomposition gas monitoring comprises a light source and signal processing module, a sealed gas container, a wall-penetrating wiring flange plate, a high-voltage wall-penetrating sleeve, a low-voltage wall-penetrating sleeve, a charge and discharge valve, a supporting seat, a high-voltage polar plate, a low-voltage polar plate, a signal excitation module, a collimating optical fiber head, a microphone, an insulating support and a signal excitation module flange cover. The method is characterized in that: the light source and the signal processing module are arranged outside the sealed gas container and are connected with a wall-through wiring flange disc on the sealed gas container through optical fibers and cables, and the other side of the wall-through wiring flange disc is respectively connected with a collimating optical fiber head and a microphone. When the device works, discharge is generated at a needle electrode of a high-voltage polar plate, insulating gas is excited to be decomposed, laser beams emitted by a light source and a signal processing module are emitted into a signal excitation module through a collimated light fiber head, the light beams excite gas components with corresponding absorption frequencies, sound pressure signals are generated inside the signal excitation module, and a microphone detects the sound pressure signals to further obtain the concentration of the corresponding gas components.
Description
Technical Field
The invention relates to a gas monitoring device, in particular to a photoacoustic spectrum gas monitoring device integrating discharge simulation and discharge decomposition gas monitoring of electrical equipment.
Background
Because of its excellent insulating and arc extinguishing properties, SF6 Gas is widely used in electrical equipment such as circuit breakers, transformers, bushings, SF6 Gas Insulated Switchgear (GIS), and the like. At present, in China, ultra-high voltage power grids and extra-high voltage power grids with the voltage class of 220kV and above are all required to be made of SF6 switch equipment, and the number of the SF6 switch equipment is 3.3 ten thousand intervals, which is the first in the world. In addition, equipment such as SF6 Gas Insulated Line (GIL) is also the first choice for power transmission mode in key places such as nuclear power, hydropower and river-crossing power transmission pipe corridors.
The SF6 gas is chemically stable, but will dissociate under discharge or over-temperature conditions; in the absence of other impurities, the dissociated SF6 will rapidly recombine and reduce to SF6 gas. However, in practical use, the SF6 gas inevitably contains impurities such as a small amount of moisture and oxygen, and the dissociated SF6 reacts with these impurities to produce a large number of highly toxic and corrosive decomposition products (SO2F2, SOF2, SO2, H2S, etc.). These decomposition products are present in the equipment and can further accelerate the development of equipment failure and endanger the safety of service personnel. As a hub for transmitting and distributing electric energy in a power grid, a fault of the SF6 switchgear may cause damage to large-scale equipment, large-area power outage, and the like, resulting in huge economic and social losses.
The insulation type fault has the highest proportion and the highest harm in the SF6 electrical equipment fault, and the fault can finally cause the decomposition of SF6 gas. The detection of the decomposed gas can realize early warning of faults and analysis of fault types. At present, SF6 fault decomposition gas detection methods specified by industry standard DL/T1205-2013 are electrochemical methods and gas chromatography methods, and high-sensitivity online monitoring cannot be realized. The detection of the SF6 decomposition products in the domestic and foreign electric power industry is limited to regular sampling and offline inspection, and the fault of SF6 electrical equipment cannot be found in time. In addition, due to the fact that the SF6 gas has multiple decomposition products and active chemical properties, the offline detection result is greatly influenced by sampling time and detection time, and the fault criterion of the SF6 decomposition gas is not uniformly determined. Therefore, a high-precision real-time online decomposition product detection device for the SF6 switch equipment is urgently needed to timely capture the decomposition process of SF6, develop scientific and reasonable fault criteria, improve the detection technical level of power equipment and guarantee the safety and stability of a power grid.
In addition, similar problems exist in gas insulating media such as C-C4F8, C4F7N, CF3I and the like, and the online device integrating the discharge simulation and the gas detection can be continuously realized.
At present, some patents also detect SF6 decomposition gas, but all belong to semi-online detection, and the requirements of fault criterion research cannot be met. For example, CN2747583Y patent "detecting mechanism of sulfur hexafluoride electrical equipment fault detector" connects pressure sensor and SO through a four-way joint2Electrochemical gasSensor and H2S electrochemical gas sensor for detecting SO2And H2S content and diagnosing the internal fault of the equipment. However, this patent can only detect SO2And H2S gas, which is limited by the sensor when detecting multiple gas components. Similarly, CN101464671A "a device and method for monitoring and controlling sulfur hexafluoride gas and its decomposition products" also discloses a method and a system for monitoring and controlling sulfur hexafluoride gas and its decomposition products. CN101644670A infrared detection device and method for sulfur hexafluoride gas discharge trace components6And detecting the decomposed gas. Also, patent CN 10151496A' SF based on photoacoustic spectroscopy6A detection system, patent CN101982759A, "infrared photoacoustic spectroscopy detection apparatus and method for sulfur hexafluoride decomposition components under partial discharge", and patent CN102661918A "non-resonance photoacoustic spectroscopy detection and analysis apparatus".
Although the detection methods are called on-line detection, in actual work, sample gas needs to be extracted from a device to be detected and injected into a photoacoustic cell of a photoacoustic spectrum detection device to realize detection, and in order to ensure the sampling representativeness of detected gas components, the photoacoustic cell needs to be sampled and flushed for multiple times, so that the detection of some unstable gas components in the fault decomposition process cannot be realized. FIG. 1 shows the operation and application of a conventional apparatus. In fig. 1, 1 is a detection instrument, 2 is a device containing a gas to be detected, and 3 is a single-interface nondestructive cyclic sampling module. The detection device comprises a detection device 1, a light source module 10, a control circuit module 11, a lock-in amplifier module 12, a gas cell 13 and a signal sensor 14, wherein the detection device 1 is provided with an internal light source module, the detection device 1 is provided with an internal control circuit module, the detection device 1 is provided with an internal lock-in amplifier module 12, the detection device 1 is provided with an internal gas cell, and the detection device 1 is. 21 is the gas interface of the device 2 containing the gas to be measured. During operation, the single-interface cyclic sampling module 3 takes out gas samples from the equipment 2 containing the gas to be detected through the gas interface 21 and enters the gas pool 13 in the detection instrument 1 through the gas inlet pipe, and the gas samples are discharged back to the single-interface cyclic sampling module 3 through the exhaust pipe after detection and are refilled into the equipment 2 containing the gas to be detected. Usually, the volume of the device 2 containing the gas to be detected is very large and is far larger than the volumes of the gas pool 13 and the pipeline, in order to ensure the representativeness of the gas sample obtained from the gas interface 21, the single-interface cyclic sampling module 3 needs to be adopted for cyclic sampling and gas recharging for many times, the sample collection process consumes a large amount of time, and meanwhile, the sample changes in the cyclic process, so that the detection result is influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an integrated device for discharge fault simulation and discharge decomposition gas monitoring. The invention can realize real-time on-line monitoring of multi-component decomposition products, avoid the problem that the traditional detection method is greatly influenced by sampling time and sampling position, and realize the monitoring of the decomposition process of gas under the discharge condition, in particular the detection of the decomposition process of SF6 gas.
The invention discloses a discharge fault simulation and discharge decomposition gas monitoring integrated device, which mainly comprises: the device comprises a light source and signal processing module, a sealed gas container, a wall-through wiring flange, a high-voltage wall-through sleeve, a low-voltage wall-through sleeve, an inflation and deflation valve, a supporting seat, a high-voltage polar plate, a low-voltage polar plate, a signal excitation module, a collimating optical fiber head, a microphone, an insulating support and a signal excitation module flange cover.
The light source and the signal processing module are arranged outside the sealed gas container and are connected with a wall-through wiring flange disc on the sealed gas container through optical fibers and cables, and the other side of the wall-through wiring flange disc is respectively connected with a collimating optical fiber head and a microphone. The wall-penetrating wiring flange plate is arranged on the side wall of the sealed gas container and is mainly used for connecting the inner optical fiber and the outer optical fiber and the cable under the condition of ensuring the sealing of the sealed gas container.
The light source and signal processing module comprises a laser light source and a drive thereof, a phase-locked amplifier, a signal switching box and a control module. The laser light source and the drive thereof are connected with the phase-locked amplifier through a cable to provide a modulation frequency reference signal for the phase-locked amplifier; the laser light source and the drive thereof are connected with an external through-wall wiring flange plate through optical fibers; the signal switching box is connected with an external through-wall wiring flange disc to obtain a signal of the microphone and transmit the signal to the phase-locked amplifier through a signal cable; the phase-locked amplifier is connected with the control module to realize control and signal detection. The phase-locked amplifier is in a multi-channel mode; the laser light sources and the number of the laser light sources are the same as the types and the amounts of the components of the detection gas, and are the same as the numbers of the collimated light fiber heads and the microphones.
The signal excitation module, the collimating optical fiber head and the microphone jointly form a plurality of gas detection units, the number of the gas detection units is determined by the type of detected gas, and each detected gas component is provided with 1 gas detection unit. The plurality of gas detection units are arranged in a centrosymmetric manner around the central line of the low-voltage pole plate. Namely, the signal excitation module, the collimating optical fiber head and the microphone are all multiple, and the number of the signal excitation module, the collimating optical fiber head and the microphone is determined according to the type of the detected gas. And the signal excitation module flange cover is arranged at the upper part of the gas detection unit.
The signal excitation module flange cover can be of a flat plate type structure, is made of a conductor material, is preferably made of brass or an aluminum alloy material, and is provided with outer ring fixing holes and inner ring fixing holes, preferably 6 fixing holes respectively, and is uniformly distributed; each signal excitation module flange cover corresponds to a plurality of signal excitation modules, and after the signal excitation module flange covers and the signal excitation modules are installed and fixed, a plurality of vent holes are formed in positions corresponding to the central cavity of the signal excitation module. The corresponding high-voltage polar plate comprises a polar plate and 1 needle electrode, the central line of the needle electrode is coincident with the central line of the low-voltage polar plate, and the central line of a flange cover of the signal excitation module is coincident. The distance between the central line of the needle electrode and the central line of each signal excitation module is the same.
The signal excitation module flange cover can also be a flat plate type structure, a conductor material is preferably brass or an aluminum alloy material, fixing holes are formed, preferably 6 fixing holes are uniformly distributed. Each signal excitation module flange cover corresponds to one signal excitation module, and a plurality of vent holes are formed in the positions corresponding to the central cavity of each signal excitation module. The corresponding high-voltage polar plate comprises a polar plate and a plurality of needle electrodes, the number of the needle electrodes is the same as that of the gas detection units, the geometric sizes of the needle electrodes are the same, and the central line of each needle electrode is superposed with the central line of the corresponding signal excitation module.
The vent hole can be a straight-through hole with the central line parallel to the central line of the signal excitation module; but the preferred air vent is a through hole with a certain inclination angle between the central line of the signal excitation module and the central line of the signal excitation module, and the inclination angle ensures that the extension line of the air vent closest to the central line of the signal excitation module is intersected with the bottom surface of the buffer cavity of the signal excitation module and is not intersected with the inner surface of the signal excitation cavity of the signal excitation module. In this way, the influence of corona noise on the sound pressure signal can be reduced.
The sealed gas container is filled with insulating gas, the charging and discharging valve is arranged on the side wall of the sealed gas container and used for vacuumizing the sealed gas container and charging the insulating gas, and the high-voltage wall bushing is arranged at the top of the sealed gas container and is communicated with the high-voltage pole plate; the low-voltage wall bushing is arranged at the bottom of the sealed gas container, and the low-voltage polar plate is arranged at the lower side in the sealed gas container through the supporting seat and is communicated with the low-voltage wall bushing; the signal excitation module is installed on the low-voltage polar plate, the insulating support is installed on the signal excitation module, the high-voltage polar plate is installed on the insulating support and is insulated from the signal excitation module, the collimating optical fiber head is installed at the collimating optical fiber head installation hole of the low-voltage polar plate, and the central line of the signal excitation module, the central line of the collimating optical fiber head installation hole of the low-voltage polar plate and the central line of the collimating optical fiber head are overlapped. The microphone is arranged on the side wall of the middle part of the signal excitation module, and the center line of the microphone is vertical to the center line of the collimated light fiber head. The low-voltage polar plate, the signal excitation module and the signal excitation module are conducted through the flange cover and have the same potential.
The signal excitation module is of a cylindrical or cuboid structure, the manufacturing material is a conductor material, preferably copper, aluminum alloy or stainless steel, the inner wall can be plated with gold, a dumbbell-shaped cavity is formed in the center, the middle part of the cavity, namely the middle position of the dumbbell, is a signal excitation cavity and is designed to be of a resonance structure, the diameter phi is 3-100 mm, the length L is 20-500 mm, and the requirement that the diameter phi is smaller than the length L is met; the two sides of the cavity, namely the two ends of the dumbbell, are buffer cavities, the diameter of the buffer cavities is larger than that of the signal excitation cavity, the side walls of the lower parts of the buffer cavities on the two sides are provided with air holes to realize the circulation of gas inside the cavity of the signal excitation module and external gas, the side wall of the signal excitation cavity in the middle of the cavity is provided with a microphone mounting hole, and the microphone mounting hole (42-3) is a through hole and is communicated with the inside of the signal excitation cavity.
The frequency response range of the microphone is 0.1 Hz-30 kHz, no response is caused to sound pressure signals in the range of 50 kHz-200 kHz generated by partial discharge, and the sensitivity is more than 20 mV/Pa. The microphone may be an electrical microphone or an optical microphone.
When the monitoring device works, a high-voltage power supply supplies power to a high-voltage polar plate and a low-voltage polar plate through a high-voltage wall bushing and a low-voltage wall bushing, discharge is generated at a needle electrode, insulating gas is excited to decompose, and the decomposed gas freely diffuses into a signal excitation module through a signal excitation module flange cover; laser emitted by the light source and the signal processing module is emitted into the signal excitation module through the collimated optical fiber head, the light beam excites gas components with corresponding absorption frequencies to generate sound pressure signals inside the signal excitation module, the microphone detects the sound pressure signals and returns the sound pressure signals to the light source and the signal processing module, and the concentration of the corresponding gas components is obtained through processing the signals. The component concentration of the generated gas is obtained while the decomposed gas is generated, and the plurality of gas detection units detect and synchronously detect a plurality of component gases. The component concentration of the generated gas can be obtained by laser excitation signals at the same time of generating the decomposed gas.
Drawings
FIG. 1 is a schematic diagram of the operation and application of a conventional apparatus;
FIG. 2 is a schematic view of a first embodiment of an integrated monitoring device for discharge simulation and discharge decomposition gas according to the present invention;
FIG. 3 is a schematic view of a second embodiment of an integrated monitoring device for discharge simulation and discharge decomposition gas according to the present invention;
FIG. 4 is a schematic structural diagram of a high-voltage plate according to a first embodiment of the monitoring device of the present invention;
FIG. 5 is a schematic view of a flange cover of a signal excitation module according to a first embodiment of the monitoring device of the present invention;
FIG. 6 is a schematic structural diagram of a high-voltage plate according to a second embodiment of the monitoring device of the present invention;
FIG. 7 is a schematic view of a flange cover of a signal excitation module according to a first embodiment of the monitoring device of the present invention;
FIG. 8 is a schematic diagram of a signal excitation module according to the present invention;
FIG. 9 is a schematic view of a low voltage plate of the present invention;
FIG. 10 is a schematic diagram of a light source and signal processing module according to the present invention;
fig. 11 is a schematic view of an embodiment of an opening of a flange cover of a signal excitation module of a monitoring device according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings and the detailed description.
FIG. 1 is a schematic diagram of the operation and application of a conventional apparatus, which is described in detail in the last paragraph of the background art.
Fig. 2 is a schematic view of a first embodiment of the discharge simulation and discharge decomposition gas integrated monitoring device according to the present invention. As shown in fig. 2, the method mainly includes: the device comprises a light source and signal processing module 410, a sealed gas container 49, a wall-through wiring flange 48, a high-voltage wall-through sleeve 45, a low-voltage wall-through sleeve 44, an air charging and discharging valve 411, a supporting seat 46, a high-voltage polar plate 41, a low-voltage polar plate 43, a signal excitation module 42, a collimation optical fiber head 40, a microphone 47, an insulating support 412 and a signal excitation module flange cover 413.
The light source and signal processing module 410 is arranged outside the sealed gas container 49 and is connected with a wall-through wiring flange 48 on the sealed gas container 49 through optical fibers and cables, and the other side of the wall-through wiring flange 48 is respectively connected with the collimating optical fiber head 40 and the microphone 47. A through-wall flange 48 is mounted on the side wall of the sealed gas container 49.
The signal excitation module 42, the collimating optical fiber head 40 and the microphone 47 jointly form a plurality of gas detection units, the number of the gas detection units is determined by the type of the detected gas, 1 gas detection unit is arranged for each detected gas component, and the plurality of gas detection units are arranged in a central symmetry manner around the central line of the low-voltage pole plate 43. The signal excitation module flange cover 413 is disposed at an upper portion of the gas detection unit.
The inside of the sealed gas container 49 is filled with insulating gas, the charging and discharging valve 411 is provided on the side wall of the sealed gas container 49, for evacuating and filling insulating gas into a sealed gas container 49, a high-voltage wall bushing 45 is arranged at the top of the sealed gas container 49, a low-voltage wall bushing 44 is arranged at the bottom of the sealed gas container 49, a low-voltage pole plate 43 is arranged at the lower side of the inside of the sealed gas container 49 through a support seat 46, and is connected with the low-voltage wall bushing 44, the signal excitation unit is installed on the low-voltage pole plate 43, the insulating support 412 is installed on the signal excitation module 42, the high-voltage pole plate 41 is installed on the insulating support 412, and is insulated with the signal excitation module 42, the high-voltage polar plate 41 is connected with the high-voltage wall bushing 45, the collimating optical fiber head 40 is arranged at the opening of the low-voltage polar plate 43, and the central line of the signal excitation module 42, the central line of the collimation optical fiber head 40 and the central line of the opening of the low-voltage polar plate 43 are superposed. The microphone 47 is installed on the middle side wall of the signal excitation module 42, and the center line of the microphone 47 is perpendicular to the center line of the collimation fiber head 40. The distance between the center line of the pin electrode on the high-voltage polar plate 41 and the center line of each signal excitation module 42 is the same. The low-voltage polar plate 43, the signal excitation module 42 and the signal excitation module flange cover 413 are conducted and have the same potential.
When the monitoring device works, a high-voltage power supply supplies power to the high-voltage pole plate 41 and the low-voltage pole plate 43 through the high-voltage wall bushing 45 and the low-voltage wall bushing 44, discharge is generated at the pin electrode of the high-voltage pole plate 41, insulating gas is excited to be decomposed, and the decomposed gas enters the signal excitation module 42 through the signal excitation module flange cover 413; laser emitted by the light source and signal processing module 410 is emitted into the signal excitation module 42 through the collimating optical fiber head 40 to excite the gas component with the corresponding absorption frequency to generate a sound pressure signal, and the microphone 47 detects the sound pressure signal and returns the sound pressure signal to the light source and signal processing module 410 to obtain the concentration of the corresponding gas component through processing. The component concentration of the generated gas can be obtained through laser excitation signals while the decomposed gas is generated, and the plurality of gas detection units detect and synchronously detect a plurality of component gases.
Fig. 3 is a schematic view of a second embodiment of the discharge simulation and discharge decomposition gas integrated monitoring device according to the present invention. As shown in fig. 3, it mainly includes: the device comprises a light source and signal processing module 410, a sealed gas container 49, a wall-through wiring flange 48, a high-voltage wall-through sleeve 45, a low-voltage wall-through sleeve 44, an air charging and discharging valve 411, a supporting seat 46, a high-voltage polar plate 41, a low-voltage polar plate 43, a signal excitation module 42, a collimation optical fiber head 40, a microphone 47, an insulating support 412 and a signal excitation module flange cover 413.
The light source and signal processing module 410 is arranged outside the sealed gas container 49 and is connected with a through-wall wiring flange 48 on the sealed gas container 49 through optical fibers and cables, and the other side of the through-wall wiring flange 48 is respectively connected with the collimating optical fiber head 40 and the microphone 47. A through-wall flange 48 is mounted on the side wall of the sealed gas container 49.
The signal excitation module 42, the collimating optical fiber head 40 and the microphone 47 jointly form a plurality of gas detection units, the number of the gas detection units is determined by the type of the detected gas, 1 gas detection unit is arranged for each detected gas component, and the plurality of gas detection units are arranged in a central symmetry manner around the central line of the low-voltage pole plate 43. The signal excitation module flange cover 413 is disposed at an upper portion of the gas detection unit.
The sealed gas container 49 is filled with insulating gas, the charging and discharging valve 411 is arranged on the side wall of the sealed gas container 49 and is used for vacuumizing and charging the insulating gas into the sealed gas container 49, the high-voltage wall bushing 45 is arranged at the top of the sealed gas container 49, the low-voltage wall bushing 44 is arranged at the bottom of the sealed gas container 49, the low-voltage pole plate 43 is arranged at the lower side in the sealed gas container 49 through the supporting seat 46 and is connected with the low-voltage wall bushing 44, the signal excitation unit is arranged on the low-voltage pole plate 43, the insulating support 412 is arranged on the signal excitation module 42, the high-voltage pole plate 41 is arranged on the insulating support 412 and is insulated from the signal excitation module 42, the high-voltage pole plate 41 is connected with the high-voltage wall bushing 45, the collimating fiber head 40 is arranged at the opening of the low-voltage pole plate 43, and, The center lines of the holes of the low-voltage polar plate 43 are overlapped. The microphone 47 is installed on the middle side wall of the signal excitation module 42, and the center line of the microphone 47 is perpendicular to the center line of the collimating fiber head 40. The number of the needle electrodes on the high-voltage polar plate 41 is the same as that of the gas detection units, the geometric dimensions of the needle electrodes are the same, and the center lines of the needle electrodes are overlapped with the center lines of the corresponding signal excitation modules 42. The low-voltage polar plate 43, the signal excitation module 42 and the signal excitation module flange cover 413 are conducted and have the same potential.
When the monitoring device works, a high-voltage power supply supplies power to the high-voltage pole plate 41 and the low-voltage pole plate 43 through the high-voltage wall bushing 45 and the low-voltage wall bushing 44, discharge is generated at the pin electrode of the high-voltage pole plate 41, insulating gas is excited to be decomposed, and the decomposed gas enters the signal excitation module 42 through the signal excitation module flange cover 413; laser emitted by the light source and signal processing module 410 is emitted into the signal excitation module 42 through the collimating optical fiber head 40 to excite gas components corresponding to absorption frequencies to generate sound pressure signals, and the microphone 47 detects the sound pressure signals and returns the sound pressure signals to the light source and signal processing module 410 to obtain the concentration of the corresponding gas components through processing. The component concentration of the generated gas can be obtained through laser excitation signals while the decomposed gas is generated, and the plurality of gas detection units detect and synchronously detect a plurality of component gases.
Fig. 4 is a schematic structural diagram of a high-voltage pole plate according to a first embodiment of the monitoring device of the invention. As shown in fig. 4, the high voltage plate 41 is made of a conductive material, the pin electrode 41-2 is mounted on the plate 41-1 of the high voltage plate 41, and the positions of the pin electrodes 41-2 are the same distance from the center line of the signal excitation module 42.
Fig. 5 is a schematic view of a flange cover of a signal excitation module according to a first embodiment of the monitoring device of the present invention. As shown in fig. 5, the signal excitation module flange cover 413 is a flat plate structure, is made of a conductive material, preferably brass or an aluminum alloy material, and is provided with an outer ring fixing hole 413-1 and an inner ring fixing hole 413-2, preferably 6, respectively, which are uniformly distributed. After the signal excitation module flange cover 413 and the 8 signal excitation modules 42 are installed and fixed, a plurality of vent holes 413-3 are formed in positions corresponding to the circular cavities of the 8 signal excitation modules 42.
Fig. 6 is a schematic structural diagram of a high-voltage plate of a second embodiment of the monitoring device of the invention. As shown in fig. 6, the high voltage plate 41 is made of a conductive material, the pin electrodes 41-2 are symmetrically installed in the center of the plate 41-1 of the high voltage plate 41, the number of the pin electrodes is 8 in the figure, or other numbers, and the center line of each pin electrode 41-2 in the detection device coincides with the center line of the signal excitation module 42.
Fig. 7 is a schematic view of a signal excitation module flange cover of a second embodiment of the monitoring device of the present invention. As shown in fig. 7, the signal excitation module flange cover 413 is a flat plate structure made of a conductive material, preferably brass or aluminum alloy, and is provided with fixing holes 413-1, preferably 6, which are uniformly distributed. After the signal excitation module flange cover 413 and the signal excitation module 42 are installed and fixed, a plurality of vent holes 413-3 are formed in the positions corresponding to the circular cavity of the signal excitation module 42.
FIG. 8 is a schematic diagram of a signal excitation module according to the present invention. As shown in fig. 8, the signal excitation module 42 is a cylinder or a rectangular structure, made of a conductor material, preferably made of copper or aluminum alloy, the inner wall of which can be plated with gold, a dumbbell-shaped cavity is formed in the center, the middle part of the cavity, i.e., the middle position of the dumbbell, is a signal excitation cavity 42-2 designed to be a resonance structure, the diameter Φ is 3-100 mm, the length L is 20-500 mm, and the diameter Φ is smaller than the length L; the two sides of the cavity, namely the two ends of the dumbbell, are buffer cavities 42-1, the diameter of the buffer cavities is larger than that of the signal excitation cavities 42-2, the side walls of the lower parts of the buffer cavities 42-1 on the two sides are provided with air holes 42-4, the circulation of the air in the cavity of the signal excitation module 42 and the external air is realized, the side wall of the signal excitation cavity 42-2 in the middle of the cavity is provided with a microphone mounting hole 42-3, and the microphone mounting hole 42-3 is a through hole and is communicated with the inside of the signal excitation cavity 42-2.
Fig. 9 is a schematic view of a low voltage plate of the present invention. As shown in fig. 9, the low voltage electrode 43 is a flat plate structure, made of a conductive material, and provided with mounting holes 43-1 for collimating the fiber heads 40, the number of the mounting holes 43-1 is the same as that of the signal excitation modules 42, and the center line of the mounting hole 43-1 coincides with that of the signal excitation module 42.
FIG. 10 is a schematic diagram of a light source and a signal processing module according to the present invention. As shown in fig. 10, the light source and signal processing module 410 includes a plurality of laser light sources and their drivers 410-1, the frequency distribution of the laser light sources corresponds to the spectral absorption peak of the detected gas, a lock-in amplifier 410-2, a signal adapter 410-3, and a control module 410-4. The laser light source and the driver 410-1 thereof are connected with the phase-locked amplifier 410-2 through a cable to provide a modulation frequency reference signal for the phase-locked amplifier 410-2; the laser light source and the driver 410-1 thereof are connected with an external wall-through wiring flange 48 through optical fibers; the adapter box 410-3 is connected with an external wall-through wiring flange 48 to obtain a signal of the microphone 47, and the signal is transmitted to the phase-locked amplifier 410-2 through a signal cable; the lock-in amplifier 410-2 is connected to the control module 410-4 to implement control and signal detection. The lock-in amplifier 410-2 is multi-channel.
Fig. 11 is a schematic view of an embodiment of an opening of a flange cover of a signal excitation module of a monitoring device according to the present invention. As shown in fig. 11, the signal excitation module flange cover 413 is a flat plate structure, and is made of a conductive material, preferably a brass or aluminum alloy material, and is provided with a fixing hole 413-1, after the signal excitation module flange cover 413 and the signal excitation module 42 are mounted and fixed, a plurality of vent holes 413-3 are formed at positions corresponding to the circular cavity of the signal excitation module 42, and a center line of the vent holes 413-3 and a center line of the signal excitation module 42 have a certain inclination angle, so that an extension line of the vent hole 413-3 closest to the center line intersects with a bottom surface of the buffer cavity 42-1 of the signal excitation module 42, but does not intersect with an inner surface of the signal excitation cavity 42-2 of the signal excitation module 42.
Claims (11)
1. The utility model provides a device that simulation of discharging and discharge decomposition gas monitoring integration which characterized in that: the device comprises a light source and signal processing module (410), a sealed gas container (49), a wall-through wiring flange (48), a high-voltage wall-through sleeve (45), a low-voltage wall-through sleeve (44), an air charging and discharging valve (411), a supporting seat (46), a high-voltage polar plate (41), a low-voltage polar plate (43), a signal excitation module (42), a collimated light fiber head (40), a microphone (47), an insulating support (412) and a signal excitation module flange cover (413);
the light source and signal processing module (410) is arranged outside the sealed gas container (49) and is connected with a wall-through wiring flange (48) on the sealed gas container (49) through optical fibers, and the other side of the wall-through wiring flange (48) is respectively connected with the collimating optical fiber head (40) and the microphone (47); the wall-through wiring flange (48) is arranged on the side wall of the sealed gas container (49);
the signal excitation module (42), the collimated light fiber head (40) and the microphone (47) jointly form a plurality of gas detection units, and the number of the gas detection units is determined by the type of detected gas; each gas detection component is provided with 1 gas detection unit, and the gas detection units are arranged around the central line of the low-pressure polar plate (43) in a centrosymmetric manner; the signal excitation module flange covers (413) are arranged at the upper part of the gas detection unit, namely the signal excitation module (42), the collimated light fiber heads (40) and the microphones (47) are all multiple, and the number is determined according to the type of the detected gas;
the high-voltage polar plate (41) comprises a polar plate (41-1) and a needle electrode (41-2), and the central line of the needle electrode (41-2) is superposed with the central line of the low-voltage polar plate (43) and the central line of a signal excitation module flange cover (413); the distance between the central line of the needle electrode (41-2) and the central line of each signal excitation module (42) is equal;
the signal excitation module flange cover (413) is of a flat plate type structure, is made of a conductor material and is provided with an outer ring fixing hole (413-1) and an inner ring fixing hole (413-2); after the signal excitation module flange cover (413) and the signal excitation modules (42) are installed and fixed, a plurality of vent holes (413-3) are formed in positions corresponding to the central cavity of the signal excitation modules (42), and the central lines of the vent holes (413-3) are overlapped or parallel to the central line of the signal excitation module (42);
insulating gas is filled in the sealed gas container (49), the charging and discharging valve (411) is arranged on the side wall of the sealed gas container (49) and used for vacuumizing and charging the insulating gas into the sealed gas container (49), and the high-voltage wall bushing (45) is arranged at the top of the sealed gas container (49) and is communicated with the high-voltage pole plate (41); the low-voltage wall bushing (44) is arranged at the bottom of the sealed gas container (49), and the low-voltage polar plate (43) is arranged at the lower side in the sealed gas container (49) through the supporting seat (46) and is communicated with the low-voltage wall bushing (44); the signal excitation module (42) is arranged on the low-voltage polar plate (43), the insulating support (412) is arranged on the signal excitation module (42), the high-voltage polar plate (41) is arranged on the insulating support (412) and is insulated from the signal excitation module (42), the collimating optical fiber head (40) is arranged at a collimating optical fiber head mounting hole (43-1) of the low-voltage polar plate (43), and the central line of the signal excitation module (42), the central line of the collimating optical fiber head mounting hole (43-1) of the low-voltage polar plate (43) and the central line of the collimating optical fiber head (40) are superposed; the microphone (47) is arranged on the side wall of the middle part of the signal excitation module (42), and the center line of the microphone (47) is vertical to the center line of the collimation optical fiber head (40); the low-voltage polar plate (43), the signal excitation module (42) and the signal excitation module flange cover (413) are conducted and have the same potential.
2. The integrated discharge simulation and discharge decomposition gas monitoring device according to claim 1, wherein: the signal excitation module flange cover (413) is made of brass or aluminum alloy materials, and 6 outer ring fixing holes (413-1) and 6 inner ring fixing holes (413-2) are uniformly distributed.
3. The integrated discharge simulation and discharge decomposition gas monitoring device according to claim 1, wherein: when the device works, a high-voltage power supply supplies power to a high-voltage polar plate (41) and a low-voltage polar plate (43) through a high-voltage wall bushing (45) and a low-voltage wall bushing (44), discharge is generated at a needle electrode (41-2), insulating gas is excited to generate decomposition, and the decomposition gas freely diffuses into a signal excitation module (42) through a signal excitation module flange cover (413); laser emitted by the light source and signal processing module (410) is emitted into the signal excitation module (42) through the collimating optical fiber head (40), the light beam excites gas components corresponding to absorption frequency to generate a sound pressure signal in the signal excitation module (42), the microphone (47) detects the sound pressure signal and returns the sound pressure signal to the light source and signal processing module (410), and the concentration of the corresponding gas components is obtained through processing the signal; the component concentration of the generated gas is obtained while the decomposed gas is generated, and the plurality of gas detection units detect and simultaneously detect a plurality of component gases.
4. The utility model provides a device that simulation of discharging and discharge decomposition gas monitoring integration which characterized in that: the device comprises a light source and signal processing module (410), a sealed gas container (49), a wall-through wiring flange (48), a high-voltage wall-through sleeve (45), a low-voltage wall-through sleeve (44), an air charging and discharging valve (411), a supporting seat (46), a high-voltage polar plate (41), a low-voltage polar plate (43), a signal excitation module (42), a collimated light fiber head (40), a microphone (47), an insulating support (412) and a signal excitation module flange cover (413);
the light source and signal processing module (410) is arranged outside the sealed gas container (49) and is connected with a wall-through wiring flange (48) on the sealed gas container (49) through optical fibers, and the other side of the wall-through wiring flange (48) is respectively connected with the collimating optical fiber head (40) and the microphone (47); the wall-through wiring flange (48) is arranged on the side wall of the sealed gas container (49);
the signal excitation module (42), the collimated light fiber head (40) and the microphone (47) jointly form a plurality of gas detection units, the number of the gas detection units is determined by the type of detected gas, 1 gas detection unit is arranged for each detected gas component, and the plurality of gas detection units are arranged around the central line of the low-pressure polar plate (43) in a central symmetry manner; the signal excitation module flange covers (413) are arranged at the upper part of the gas detection unit, namely the signal excitation module (42), the collimated light fiber heads (40) and the microphones (47) are all multiple, and the number is determined according to the type of the detected gas;
the high-voltage polar plate (41) comprises a polar plate (41-1) and a plurality of needle electrodes (41-2), the number of the needle electrodes (41-2) is the same as that of the gas detection units, the geometric dimensions of the needle electrodes (41-2) are the same, and the central line of each needle electrode (41-2) is superposed with the central line of the corresponding signal excitation module (42);
the signal excitation module flange cover (413) is of a flat plate type structure, is made of a conductor material and is provided with fixing holes (413-1), and the fixing holes (413-1) are uniformly distributed; after the signal excitation module flange cover (413) and the signal excitation module (42) are installed and fixed, a plurality of vent holes (413-3) are formed in the positions corresponding to the central cavity of the signal excitation module (42), and the central lines of the vent holes (413-3) are overlapped or parallel to the central line of the signal excitation module (42);
insulating gas is filled in the sealed gas container (49), the charging and discharging valve (411) is arranged on the side wall of the sealed gas container (49) and used for vacuumizing and charging the insulating gas into the sealed gas container (49), and the high-voltage wall bushing (45) is arranged at the top of the sealed gas container (49) and is communicated with the high-voltage pole plate (41); the low-voltage wall bushing (44) is arranged at the bottom of the sealed gas container (49), and the low-voltage polar plate (43) is arranged at the lower side in the sealed gas container (49) through the supporting seat (46) and is communicated with the low-voltage wall bushing; the signal excitation module (42) is arranged on the low-voltage polar plate (43), the insulating support (412) is arranged on the signal excitation module (42), the high-voltage polar plate (41) is arranged on the insulating support (412) and is insulated from the signal excitation module (42), the collimating optical fiber head (40) is arranged at a collimating optical fiber head mounting hole (43-1) of the low-voltage polar plate (43), and the central line of the signal excitation module (42), the central line of the collimating optical fiber head mounting hole (43-1) of the low-voltage polar plate (43) and the central line of the collimating optical fiber head (40) are superposed; the microphone (47) is arranged on the side wall of the middle part of the signal excitation module (42), and the center line of the microphone (47) is vertical to the center line of the collimation optical fiber head (40); the low-voltage polar plate (43), the signal excitation module (42) and the signal excitation module flange cover (413) are conducted and have the same potential.
5. The integrated apparatus for discharge simulation and monitoring of decomposition gas by discharge according to claim 4, wherein: the signal excitation module flange cover (413) is made of brass or aluminum alloy materials, and 6 fixing holes (413-1) are uniformly distributed.
6. The integrated apparatus for discharge simulation and monitoring of decomposition gas by discharge according to claim 4, wherein: when the device works, a high-voltage power supply supplies power to a high-voltage polar plate (41) and a low-voltage polar plate (43) through a high-voltage wall bushing (45) and a low-voltage wall bushing (44), discharge is generated at a needle electrode (41-2), insulating gas is excited to generate decomposition, and the decomposition gas freely diffuses into a signal excitation module (42) through a signal excitation module flange cover (413); laser emitted by the light source and signal processing module (410) is emitted into the signal excitation module (42) through the collimating optical fiber head (40), the light beam excites gas components corresponding to absorption frequency to generate a sound pressure signal inside the signal excitation module (42), the microphone (47) detects the sound pressure signal and returns the sound pressure signal to the light source and signal processing module (410), the concentration of the corresponding gas components is obtained through processing the signal, the component concentration of generated gas is obtained while decomposed gas is generated, and the plurality of gas detection units detect and synchronously detect gases with various components.
7. The integrated apparatus for discharge simulation and monitoring of discharge decomposition gas according to claim 1 or 4, wherein: the light source and signal processing module (410) comprises a plurality of laser light sources and a drive (410-1) thereof, the frequency distribution of the laser light sources corresponds to the spectral absorption peak of the detected gas, a lock-in amplifier (410-2), a signal switching box (410-3) and a control module (410-4); the laser light source and the drive (410-1) thereof are connected with the phase-locked amplifier (410-2) through a cable, and provide a modulation frequency reference signal for the phase-locked amplifier (410-2); the laser light source and the drive (410-1) thereof are connected with an external wall-through wiring flange plate (48) through optical fibers; the signal adapter box (410-3) is connected with an external wall-through wiring flange plate (48) to obtain a signal of the microphone (47), and the signal is transmitted to the phase-locked amplifier (410-2) through a signal cable; the phase-locked amplifier (410-2) is connected with the control module (410-4) to realize control and signal detection; the phase-locked amplifier (410-2) is multi-channel; the number of the laser light sources and the number of the drivers (410-1) thereof are related to the number of the types of the gas components to be detected, and are the same as the number of the collimating fiber heads (40) and the number of the microphones (47).
8. The integrated apparatus for discharge simulation and monitoring of discharge decomposition gas according to claim 1 or 4, wherein: the signal excitation module (42) is in a cylindrical or cuboid structure and is made of a conductor material; a dumbbell-shaped cavity is formed in the center of the cylinder or the cuboid structure, a signal excitation cavity (42-2) is formed in the middle of the cavity and is of a resonance structure, and the signal excitation cavity (42-2) has the diameter phi smaller than the length L; the two sides of the cavity are provided with buffer cavities (42-1), the diameter of each buffer cavity (42-1) is larger than that of each signal excitation cavity (42-2), the side wall of the lower part of each buffer cavity (42-1) on the two sides is provided with an air hole (42-4) to realize the circulation of air inside the cavity of the signal excitation module (42) and air outside the cavity, the side wall of the signal excitation cavity (42-2) in the middle of the cavity is provided with a microphone mounting hole (42-3), and each microphone mounting hole (42-3) is a through hole and is communicated with the inside of the signal excitation cavity (42-2).
9. The integrated discharge simulation and discharge decomposition gas monitoring device according to claim 8, wherein: the signal excitation module (42) is made of copper or aluminum alloy.
10. The integrated apparatus for discharge simulation and monitoring of discharge decomposition gas according to claim 1 or 4, wherein: the microphone (47) is an electrical microphone or an optical microphone.
11. The integrated apparatus for discharge simulation and monitoring of discharge decomposition gas according to claim 1 or 4, wherein: the central line of the vent hole (413-3) and the central line of the signal excitation module (42) have a certain inclination angle, so that the extension line of the vent hole (413-3) closest to the central line of the signal excitation module (42) is intersected with the bottom surface of the buffer cavity (42-1) of the signal excitation module (42) and is not intersected with the inner surface of the signal excitation cavity (42-2) of the signal excitation module (42).
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| CN110308340B (en) * | 2019-05-08 | 2022-02-15 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Direct-current wall bushing fault simulation device and method |
| CN110196237A (en) * | 2019-06-25 | 2019-09-03 | 国网江苏省电力有限公司 | A kind of SF6Decomposition product multi-analyte immunoassay system and method |
| CN112649544A (en) * | 2020-11-09 | 2021-04-13 | 三峡大学 | Environment-friendly insulating gas electrolysis device and component in-situ detection method |
| CN114324182A (en) * | 2021-12-24 | 2022-04-12 | 中国科学院电工研究所 | High-pressure SF6Decomposed gas detection device |
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