CN113109675B - Image diagnosis device and method for insulating stack vacuum surface flashover - Google Patents
Image diagnosis device and method for insulating stack vacuum surface flashover Download PDFInfo
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 66
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- 239000013307 optical fiber Substances 0.000 claims description 63
- 238000009413 insulation Methods 0.000 claims description 33
- 238000007789 sealing Methods 0.000 claims description 29
- 230000005540 biological transmission Effects 0.000 claims description 20
- 239000005304 optical glass Substances 0.000 claims description 13
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
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- 238000012634 optical imaging Methods 0.000 abstract description 4
- 238000003384 imaging method Methods 0.000 description 14
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- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002059 diagnostic imaging Methods 0.000 description 1
- 238000002405 diagnostic procedure Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides an image diagnosis device and method for insulating stack vacuum surface flashover, which solve the problem that the conventional optical imaging technology is difficult to apply to pulse discharge image diagnosis in an insulating stack annular target space. The device comprises an optical bracket, a flange cylinder, an optical probe, a camera, a control display unit, a photoelectric detector and an oscilloscope; n image diagnosis holes and Q light pulse measurement holes adjacent to the image diagnosis holes are uniformly distributed on the optical bracket along the radial direction, wherein N is more than or equal to 2 and less than or equal to 48,2 and Q is more than or equal to 4; the flange cylinder is coaxially and fixedly connected with the optical bracket, and an annular supporting frame is arranged on the outer circular surface of the flange cylinder; the number of the optical probes is M, M=N+Q, and the M optical probes are respectively arranged in the N image diagnosis holes and the Q light pulse light measurement holes in a penetrating way; n optical probes on the N image diagnosis holes are connected with a camera, and the camera is connected with a control display unit; q optical probes on the Q optical pulse measuring holes are connected with a photoelectric detector, and the photoelectric detector is connected with an oscilloscope.
Description
Technical Field
The invention belongs to the technical field of pulse power, and particularly relates to an image diagnosis device and method for insulating stack vacuum surface flashover.
Background
The vacuum insulation surface flashover phenomenon of the high-voltage insulating material restricts the voltage-resistant capability of the high-voltage pulse power device, is a technical problem to be faced by the optimal design of a system, and is a key link for realizing the miniaturization of the device.
As shown in fig. 1, an insulation stack formed by a plurality of insulation rings 01 and a grading ring 02 is a key component commonly used for large pulse power devices. Because the randomness of the vacuum insulation surface flashover phenomenon cannot accurately predict the occurrence position of the vacuum surface flashover of the insulation ring, the conventional image diagnosis technology is adopted, or the complete vacuum surface flashover image is difficult to accurately capture, or the resolution of the captured integral vacuum surface flashover image cannot meet the research requirement. In addition, the insulating stack is a closed ring structure. Light generated by vacuum surface flashover cannot directly reach an external space, and if devices such as an optical lens are adopted for transmission, the technical problems of complex system, complex installation, low light transmission efficiency and the like are faced.
Currently, existing optical imaging systems and experimental methods include the following documents [1] - [6]:
beta-ray fiber optic imaging system [ J ], nuclear technology 1997,20 (10): 583-586;
chinese patent with publication number CN1588433a, patent name fiber imaging touch screen;
Chinese patent publication No. CN103223244a, entitled endoscope apparatus for imaging using single optical fiber;
Alignment and positioning methods of multi-core structure optical fibers and experimental research [ C ], harbin engineering university, 2007;
the publication number is CN103149512A, and the patent name is Chinese patent of an insulator insulation state evaluation method based on ultraviolet imaging characteristics;
the surface flashover of the insulating medium gas under the pulse condition has the luminous characteristics of strong laser and particle beam,
2018,30(10)：105002；
Documents [1-4] all describe systems developed using fiber optic transmission imaging techniques. Document [1] uses 148 optical fibers to form a scintillation optical fiber block to obtain higher spatial resolution for optical measurement of a single target. Document [2] is to form an image by condensing a target light source onto an imaging element using an optical fiber bundle, and to perform positioning detection of touch by a controller using image change. The literature [3] utilizes the small, soft and imaging characteristics of the optical fiber, combines the intelligent control technology signal processing technology, adopts a single optical fiber as a pipeline of an endoscope device, realizes the function of a microscopic endoscope, and obtains a high-resolution image. In the document [4], three-core optical fibers are taken as an example, and special optical fibers are aligned and positioned for research, so that the influence of noise on the centering can be reduced by the image processing technology, and the positioning precision of the optical cores can be improved. Documents [5-6] describe experimental methods for acquiring an image of an insulation material flashover along a surface using other diagnostic imaging techniques. The diagnostic targets of the documents [5-6] are all single, and the ultraviolet imaging technique adopted in the document [5] evaluates the flashover image, while the image diagnosis is carried out in the document [6] by adopting the framing camera technique.
Documents [1] and [2] use the purpose of a plurality of optical fibers to obtain higher resolution and more light for a single target. In the document [3], image information in a narrow and curved space is obtained by utilizing physical properties such as light softness. Document [4] uses the principle of multi-fiber imaging for positioning the fiber core with high accuracy, but has little relation with imaging. Document [5] emphasizes a method of evaluating an image result. Document [6] focuses on a method for diagnosing a single target by a split camera map diagnosis technique.
In summary, the existing optical imaging techniques focus on image signal acquisition and application of a single target or a target within a limited direction angle, but are difficult to apply to pulse discharge image diagnosis (vacuum rim flashover imaging diagnosis) within an annular target space of an insulation stack.
Disclosure of Invention
In order to solve the technical problems that the existing optical imaging technology focuses on image signal acquisition and application of a single target or a target in a limited direction angle and is difficult to apply to pulse discharge image diagnosis in an insulation stack annular target space, the invention provides an image diagnosis device and an image diagnosis method for insulation stack vacuum surface flashover.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
An image diagnosis device for insulating stack vacuum surface flashover, which is characterized in that: the device comprises an optical bracket, a flange cylinder, an optical probe, a camera, a control display unit, a photoelectric detector and an oscilloscope;
The optical bracket is of a cylindrical structure with one end open, N image diagnosis holes uniformly distributed on the circumference and Q light pulse measurement holes uniformly distributed on the circumference are formed in the outer side wall of the optical bracket along the radial direction, and the image diagnosis holes and the light pulse measurement holes are adjacently arranged along the axial direction of the optical bracket, wherein N is more than or equal to 2 and less than or equal to 48,2 and Q is more than or equal to 4;
The flange cylinder is coaxially and fixedly connected with one end of the opening of the optical bracket, and an annular supporting frame is arranged on the outer circular surface of the flange cylinder;
The number of the optical probes is M, M=N+Q, the M optical probes are respectively arranged in the N image diagnosis holes and the Q light pulse light measurement holes in a penetrating way, and the outer surface of each optical probe is an optical glass window;
the cameras are arranged in the flange cylinder, N optical probes on N image diagnosis holes are connected with the cameras, and the cameras are connected with the control display unit positioned outside the flange cylinder; q optical probes on the Q optical pulse measuring holes are connected with a photoelectric detector positioned outside the flange cylinder, and the photoelectric detector is connected with an oscilloscope.
Further, N is 48 and Q is 4.
Further, the 48 image diagnosis holes are 2 circles distributed along the axial direction of the optical bracket, and the two circles are arranged in a staggered manner along the circumferential direction.
Further, the optical probe comprises a sealing component, an optical fiber fixing component, an optical lens, an image transmission optical fiber and the optical glass window;
The image diagnosis hole and the light pulse measurement hole are stepped, and comprise a first mounting hole and a second mounting hole which are radially arranged on the optical bracket from inside to outside and sequentially increased in diameter;
the sealing component is arranged in the second mounting hole and is of a sleeve structure;
The optical glass window is arranged at the outer end part of the inner cavity of the sealing component;
One end of the optical fiber fixing assembly is installed in the first installation hole, the other end of the optical fiber fixing assembly is positioned in the cavity of the sealing assembly, and a groove is formed in the end part of the other end along the radial direction of the optical bracket;
The optical lens is arranged in the groove, and a distance exists between the bottom surface of the optical lens and the bottom of the groove;
The image transmission optical fiber is arranged in the optical fiber fixing assembly in a penetrating way, one end of the image transmission optical fiber extends into the groove, a distance exists between the image transmission optical fiber and the optical lens, and the other end of the image transmission optical fiber is connected with the camera or the photoelectric detector.
Further, the optical probe also comprises a sealing ring and a pressing ring;
the sealing ring is arranged between the step surface of the second mounting hole and the sealing component;
The inner wall of one end of the first mounting hole, which is close to the center of the optical bracket, is provided with a first annular bulge, and one end of the first mounting hole, which is far away from the center of the optical bracket, is provided with an annular groove;
the middle part of the optical fiber fixing component positioned in the first mounting hole is provided with a second annular bulge, and the second annular bulge is propped against the first annular bulge;
The pressing ring is sleeved on the optical fiber fixing assembly and is positioned in the annular groove for fastening and limiting the optical fiber fixing assembly.
Further, a third annular protrusion is arranged on the inner surface of the outer end part of the sealing assembly and used for limiting the optical glass window.
Further, the camera is connected with the control display unit through an electro-optical converter and a photoelectric converter which are sequentially arranged, and the electro-optical converter is positioned in the flange cylinder.
Further, the optical bracket and the flange cylinder are connected through the adapter cylinder.
Further, the output port of the photoelectric converter is a USB port;
the camera is a CCD camera;
The annular supporting frame is made of aluminum alloy.
Further, the optical lens of the optical probe on the optical pulse measuring hole is a wide-angle optical lens;
An annular cover plate is arranged on the outer side face of one end, far away from the optical bracket, of the flange cylinder.
Meanwhile, the invention provides an image diagnosis method for insulating stack vacuum surface flashover, which is characterized by comprising the following steps of:
1) The optical bracket and the flange cylinder extend into the to-be-measured piece, the annular support frame is matched with the inner wall of the to-be-measured piece to realize positioning, the annular surface formed by the optical probes on all the image diagnosis holes is coaxially opposite to the annular insulating stack of the to-be-measured piece, the flange cylinder is fixedly connected with the to-be-measured piece, and the tightness of the inner cavity of the to-be-measured piece is ensured;
2) Starting a camera, controlling a display unit, a photoelectric detector and an oscilloscope;
3) The control display unit and the oscilloscope are observed, and if the control display unit observes an flashover integral image and the oscilloscope detects an electric pulse signal of flashover luminescence, the insulation stack has a flashover phenomenon;
4) And obtaining the position and the relative moment of the occurrence of the flashover of the insulation stack surface according to the flashover integral image obtained in the step 3) and the corresponding electric pulse signals.
Compared with the prior art, the invention has the advantages that:
1. the image diagnosis device and the method utilize the characteristic of compact structure of the optical probes, uniformly arrange a plurality of optical probes on the optical support at 360 degrees, uniformly arrange a plurality of optical fibers at 360 degrees, collect images at the same time, collect 360-degree torus random images at the same time, realize the purpose of insulating stack vacuum along-surface 360-degree torus random image diagnosis, and obtain the moment of insulating stack along-surface flashover according to the obtained flashover integral image and corresponding electric pulse signals.
2. The image diagnosis device and the method can be applied to annular insulating materials or other random discharge experiments, and the problem of surface flashover caused by the randomness and the inconsistency of pulse discharge is avoided.
3. The plurality of evenly-distributed optical probes on the image diagnosis hole in the image diagnosis device can monitor the flashover luminous image of the whole discharge surface in one experiment, thereby being beneficial to obtaining more complete experimental data and realizing accurate monitoring.
4. The CCD camera is adopted by the camera, a plurality of images are recorded in different areas of the same CCD, and the performance of the CCD is fully exerted, so that the cost performance is high.
5. According to the invention, 48 image diagnosis holes are arranged to be 2 circles distributed along the axial direction of the optical bracket, so that the installation space of the optical probe is increased, and the installation efficiency of the optical probe is further improved.
Drawings
FIG. 1 is a schematic diagram of an insulation stack;
FIG. 2 is a schematic diagram of an image diagnosis apparatus for insulation stack vacuum surface flashover according to the present invention;
FIG. 3 is an enlarged schematic view of a portion of the optical probe of FIG. 2;
FIG. 4 is a schematic diagram of a diagnostic test setup of an image diagnostic device for insulation stack vacuum rim flashover in accordance with the present invention;
wherein, the reference numerals are as follows:
01-insulating ring, 02-equalizing ring;
The device comprises a 1-optical bracket, a 2-light pulse measuring hole, a 3-switching cylinder, a 4-annular supporting frame, a 5-flange cylinder, a 6-sealing component, a 7-optical glass window, an 8-optical lens, a 9-image transmission optical fiber, a 10-sealing ring, an 11-pressing ring, a 12-optical fiber fixing component, a 13-image diagnosis hole, a 14-screw, a 15-first mounting hole, a 16-second mounting hole, a 17-groove, a 18-first annular bulge, a 19-annular groove, a 20-second annular bulge, a 21-annular cover plate, a 22-to-be-measured piece, a 23-high voltage electrode, a 24-ground electrode, a 25-annular insulation stack, a 26-optical probe and a 27-third annular bulge.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The invention relates to an image diagnosis device for insulating stack vacuum surface flashover, which can diagnose an insulating ring vacuum surface flashover image at 360 degrees simultaneously, and as shown in figure 2, the diagnosis device comprises an optical bracket 1, a transfer tube 3, a flange tube 5, an optical probe 26, a camera, a control display unit, a photoelectric detector and an oscilloscope.
The optical bracket 1, the adapter tube 3 and the flange tube 5 are coaxially and sequentially fixedly connected, the two ends of the adapter tube 3 are of flange structures, correspondingly, the end face of the optical bracket 1 connected with one end of the adapter tube 3 and the end face of the flange tube 5 connected with the other end of the adapter tube 3 are respectively provided with a threaded hole and a sealing ring, the adapter tube 3 is fixed and sealed with the optical bracket 1 and the flange tube 5 through screws, and further the coaxial fixation of the optical bracket 1 and the flange tube 5 is realized; the outer circular surface of the flange cylinder 5 is provided with an annular supporting frame 4, and the annular supporting frame 4 is made of aluminum alloy materials in the embodiment.
The optical bracket 1 adopts a hollow nylon cylindrical structure with holes on the wall, an opening is arranged at one end connected with the adapter tube 3, the holes of the optical bracket 1 are used as mounting holes of the optical probe 26, and the optical bracket comprises N image diagnosis holes 13 uniformly distributed along the radial direction and the circumference of the optical bracket 1 and Q light pulse measuring holes 2 uniformly distributed along the radial direction and the circumference of the optical bracket 1, wherein N is more than or equal to 2 and less than or equal to 48,2 and Q is more than or equal to 4. 48 image diagnosis holes 13 uniformly distributed in the circumference and 4 light pulse measurement holes 2 uniformly distributed in the circumference are formed in the outer side wall of the optical bracket 1 in the radial direction, and the image diagnosis holes 13 and the light pulse measurement holes 2 are adjacently arranged along the axial direction of the optical bracket 1; correspondingly, the number of the optical probes 26 is 52, wherein 48 optical probes 26 are respectively penetrated in 48 image diagnosis holes 13, and the rest 4 optical probes 26 are respectively penetrated in 4 light pulse measuring holes 2; in order to facilitate the installation of the optical probe 26 on the image diagnosis hole 13, the present embodiment sets 48 image diagnosis holes 13 to 2 circles distributed along the axial direction of the optical bracket 1, and the 48 image diagnosis holes 13 of 2 circles are uniformly arranged along the same circumferential direction, that is, the image diagnosis holes 13 of 2 circles are arranged in a staggered manner along the circumferential direction of the optical bracket 1, so that the installation space of the optical probe 26 is increased, and the installation efficiency of the optical probe 26 is further improved.
The image diagnosis hole 13 and the light pulse measuring hole 2 are stepped, and comprise a first mounting hole 15 and a second mounting hole 16 which are formed in the radial direction of the optical bracket 1 from inside to outside and sequentially increase in diameter.
As shown in fig. 3, the optical probe 26 comprises a sealing component 6, an optical glass window 7, an optical lens 8, an image transmission optical fiber 9, a sealing ring 10, a pressing ring 11 and an optical fiber fixing component 12; the sealing component 6 is arranged in the second mounting hole 16, and the sealing component 6 is of a sleeve structure; the optical glass window 7 is arranged at the outer end of the inner cavity of the sealing component 6, and a third annular bulge 27 is arranged on the inner surface of the outer end part of the sealing component 6 and used for limiting the optical glass window 7; one end of the optical fiber fixing component 12 is arranged in the first mounting hole 15, the other end is positioned in the cavity of the sealing component 6, and the other end is provided with a groove 17 along the radial direction of the optical bracket 1; the optical lens 8 is arranged in the groove 17, and distances exist between the bottom surface of the optical lens 8 and the bottom of the groove 17, and between the top surface of the optical lens 8 and the optical glass window 7; the image transmission optical fiber 9 is arranged in the optical fiber fixing component 12 in a penetrating way, one end of the image transmission optical fiber extends into the groove 17, and a distance exists between the image transmission optical fiber and the optical lens 8. The seal ring 10 is mounted between the second mounting hole 16 and the seal assembly 6; the inner wall of one end of the first mounting hole 15, which is close to the center of the optical bracket 1, is provided with a first annular bulge 18, and one end of the first mounting hole, which is far away from the center of the optical bracket 1, is provided with an annular groove 19; the middle part of the optical fiber fixing assembly 12 positioned in the first mounting hole 15 is provided with a second annular bulge 20, and the second annular bulge 20 is abutted against the first annular bulge 18; the pressing ring 11 is sleeved on the optical fiber fixing assembly 12 and is positioned in the annular groove 19 for fastening and limiting the optical fiber fixing assembly 12.
The embodiment can ensure the fixation of 48 optical probes 26 on 48 image diagnosis holes 13 and the vacuum sealing, the 48 optical probes 26 on 48 image diagnosis holes 13 are uniformly distributed along the circumferential direction, the optical lens 8 of each optical probe 26 can detect images within 7.5 degrees, and the 48 optical probes 26 on 48 image diagnosis holes 13 are connected with a camera through optical fibers, namely one end of each optical fiber is connected with an image transmission optical fiber 9, and the other end of each optical fiber is connected with the camera; and the camera is arranged inside the flange cylinder 5 and is connected with the control display unit. In the embodiment, the camera adopts the CCD camera, the optical probe 26 arranged on the image diagnosis hole 13 is defined as the first optical probe, in order to improve the imaging efficiency of the imaging system, the functions of the CCD camera are fully developed, 48 optical fibers respectively connected with the 48 first optical probes are imaged on the CCD camera in sequence according to the circumferential arrangement sequence of the first optical probes, the performance of the CCD camera is fully exerted, the position where the surface flashover occurs can be clearly defined, and the cost is low. The CCD camera converts the acquired optical signals into electric signals, and in order to ensure transmission efficiency and quality, signal transmission between the CCD camera and the control display unit adopts a secondary conversion transmission mode of an electric-optical converter and a photoelectric converter, and the electric-optical converter is positioned in the flange barrel 5.
The optical probe 26 on the optical pulse measuring hole 2 is defined as a second optical probe, the optical lens 8 of the second optical probe adopts wide-angle optical lenses, 4 wide-angle optical lenses are connected with photoelectric detectors positioned outside the flange barrel 5, the photoelectric detectors are connected with an oscilloscope, the wide-angle optical lenses are connected with the photoelectric detectors through optical fibers, and the optical fibers are arranged in the inner cavities of the adapter barrel 3 and the flange barrel 5 in a penetrating manner. The 4 wide-angle optical lenses uniformly distributed on the circumference collect 4-direction surface flashover luminous signals, and the signals are changed into electric pulse signals which can be collected by an oscilloscope through a photoelectric converter, as shown in fig. 2, and the design can be used for monitoring the relative time between the surface discharge moment and the main voltage.
The invention utilizes the compact structure of the optical probe 26 to uniformly arrange a plurality of optical probes 360 degrees on the optical bracket 1, adopts the thought that a plurality of optical fibers are uniformly arranged 360 degrees and simultaneously collect images, and realizes the purpose of random image diagnosis of the 360-degree torus of the vacuum edge surface of the insulation stack. The device can collect 360-degree torus random images at the same time, and can be applied to diagnosis of pulse discharge images in 360-degree space of the annular target.
The assembly process of the image diagnosis device of the present embodiment:
1) The 52 optical probes 26 with optical fibers are respectively arranged in 48 image diagnosis holes 13 and 4 light pulse measuring holes 2 on the optical bracket 1;
2) After the 48 optical probes 26 (first optical probes) on the 48 image diagnosis holes 13 are mounted, the optical fibers are straightened and bundled by a bundling belt, and the optical fibers are passed through the adapter cylinder 3 and connected with the optical bracket 1 and the adapter cylinder 3 by screws. Adopting the same method, fixing a flange cylinder 5 and an adapter cylinder 3, and arranging an annular supporting frame 4 on the outer circular surface of the flange cylinder 5;
3) The CCD camera is arranged in the flange cylinder 5 and is connected with the optical fiber in sequence, the electric-optical converter is arranged in the flange cylinder 5 and is connected with the CCD camera, the signal after passing through the electric-optical converter is connected to the photoelectric converter between the measurement chambers through the optical fiber, and the output port of the photoelectric converter is a USB port, so that the CCD camera is convenient to directly connect with the control display unit, and the electric signal is transmitted to the control display unit. The control display unit can be a notebook computer.
Meanwhile, 4 optical probes 26 (second optical probes) on the 4 optical pulse diagnosis holes 2 are connected with the photoelectric detectors outside the flange cylinder 5 through optical fibers, the optical fibers penetrate through the optical bracket 1, the switching cylinder 3 and the flange cylinder 5, optical pulse signals are transmitted to the photoelectric detectors through the optical fibers, and finally, electric signals are transmitted to the oscilloscope through the coaxial cable.
The working procedure of the image diagnosis device of the embodiment is as follows:
1) As shown in fig. 4, the optical bracket 1 and the flange cylinder 5 are horizontally placed in the vacuum diode from the ground electrode 24 of the workpiece (vacuum diode), the optical bracket 1 extends to the high-voltage electrode 23 of the vacuum diode, the optical probe 26 on the light pulse measuring hole is ensured to aim at the insulating stack, the annular supporting frame 4 is in contact with the annular surface wall of the ground electrode 24 of the vacuum diode, the positioning is realized, the optical bracket 1 is coaxial with the vacuum diode, the flange cylinder 5 is fixed with the annular cover plate 21 by virtue of the fixing screw 14, and the annular cover plate 21 is abutted against the round end surface of the ground electrode 24 of the vacuum diode. The sealing performance of the vacuum diode cavity in the installation process. The impedance of the coaxial cable is 50 omega, and the tail end of the coaxial cable is required to be matched with a 50 omega resistor;
2) Starting a camera, a control display unit, a photoelectric detector, an oscilloscope and a control system, and checking a detection system;
3) In normal operation, the operator will provide a "before zero" 5 second report. When a signal of 1 second before zero is heard, starting a start working button of the control system;
4) After the experiment is finished, if the insulation stack has a flashover phenomenon, the control display unit can acquire a flashover integral image of the insulation stack; meanwhile, the oscilloscope can acquire an electric pulse signal of the flashover luminescence and the output voltage of the pulse device;
5) And finally, according to the data obtained in the step 4), obtaining an insulation stack surface flashover integral image and a flashover position, and outputting a voltage signal relative to a pulse device, wherein the flashover position and the relative moment of the insulation stack surface flashover occur.
The image diagnosis method can be used for an optical fiber imaging system for simultaneously acquiring 360-degree torus random images, and can be applied to engineering practice.
The above description is only of the preferred embodiments of the present invention, and the technical solution of the present invention is not limited thereto, and any modifications made by those skilled in the art based on the main technical concept of the present invention are included in the technical scope of the present invention.
Claims (10)
1. An image diagnostic device for insulating stack vacuum rim flashover, characterized in that: the device comprises an optical bracket (1), a flange cylinder (5), an optical probe (26), a camera, a control display unit, a photoelectric detector and an oscilloscope;
the optical bracket (1) is of a cylindrical structure with one end open, N image diagnosis holes (13) uniformly distributed along the circumference and Q light pulse measuring holes (2) uniformly distributed along the circumference are formed in the outer side wall of the optical bracket (1), and the image diagnosis holes (13) and the light pulse measuring holes (2) are adjacently arranged along the axial direction of the optical bracket (1), wherein N is more than or equal to 2 and less than or equal to 48,2 and Q is more than or equal to 4;
the flange cylinder (5) is coaxially and fixedly connected with one end of the opening of the optical bracket (1), and an annular supporting frame (4) is arranged on the outer circular surface of the flange cylinder (5);
The optical probe (26) comprises a sealing assembly (6), an optical fiber fixing assembly (12), an optical lens (8), an image transmission optical fiber (9) and an optical glass window (7); an optical lens (8) of an optical probe (26) on the optical pulse measuring hole (2) is a wide-angle optical lens and is used for collecting a surface flashover luminous signal so as to monitor the relative time between the surface discharge moment and the main voltage;
The number of the optical probes (26) is M, M=N+Q, the M optical probes (26) are respectively arranged in the N image diagnosis holes (13) and the Q light pulse measuring holes (2) in a penetrating mode, and the outer surface of each optical probe (26) is an optical glass window (7);
the camera is arranged in the flange cylinder (5), N optical probes (26) on N image diagnosis holes (13) are connected with the camera, and the camera is connected with a control display unit positioned outside the flange cylinder (5); q optical probes (26) on the Q optical pulse measuring holes (2) are connected with photoelectric detectors positioned outside the flange cylinder (5), and the photoelectric detectors are connected with an oscilloscope.
2. The image diagnostic device for insulation stack vacuum rim flashover of claim 1, wherein: the N is 48, and Q is 4.
3. The image diagnostic device for insulation stack vacuum rim flashover of claim 2, wherein: the 48 image diagnosis holes (13) are 2 circles distributed along the axial direction of the optical bracket (1).
4. An image diagnostic device for insulation stack vacuum rim flashover according to claim 1 or 2 or 3, characterized in that:
The image diagnosis hole (13) and the light pulse measuring hole (2) are stepped, and comprise a first mounting hole (15) and a second mounting hole (16) which are radially arranged on the optical bracket (1) from inside to outside and sequentially increase in diameter;
The sealing component (6) is arranged in the second mounting hole (16), and the sealing component (6) is of a sleeve structure;
the optical glass window (7) is arranged at the outer end part of the inner cavity of the sealing component (6);
One end of the optical fiber fixing assembly (12) is arranged in the first mounting hole (15), the other end of the optical fiber fixing assembly is positioned in the cavity of the sealing assembly (6), and a groove (17) is formed in the end part of the other end along the radial direction of the optical bracket (1);
the optical lens (8) is arranged in the groove (17), and a distance exists between the bottom surface of the optical lens (8) and the bottom of the groove (17);
the image transmission optical fiber (9) is arranged in the optical fiber fixing component (12) in a penetrating way, one end of the image transmission optical fiber extends into the groove (17) and is separated from the optical lens (8), and the other end of the image transmission optical fiber is connected with the camera or the photoelectric detector.
5. The image diagnostic device for insulation stack vacuum rim flashover of claim 4, wherein: the optical probe (26) further comprises a sealing ring (10) and a pressing ring (11);
The sealing ring (10) is arranged between the step surface of the second mounting hole (16) and the sealing assembly (6);
The inner wall of one end of the first mounting hole (15) close to the center of the optical bracket (1) is provided with a first annular bulge (18), and one end far away from the center of the optical bracket (1) is provided with an annular groove (19);
The middle part of the optical fiber fixing assembly (12) positioned in the first mounting hole (15) is provided with a second annular bulge (20), and the second annular bulge (20) is abutted against the first annular bulge (18);
The pressing ring (11) is sleeved on the optical fiber fixing assembly (12) and is positioned in the annular groove (19) and used for fastening and limiting the optical fiber fixing assembly (12).
6. The image diagnostic device for insulation stack vacuum rim flashover of claim 5, wherein: the inner surface of the upper end of the sealing component (6) is provided with a third annular bulge (27) for limiting the optical glass window (7).
7. The image diagnostic device for insulation stack vacuum rim flashover of claim 6, wherein: the camera is connected with the control display unit through an electro-optical converter and a photoelectric converter which are sequentially arranged, and the electro-optical converter is positioned in the flange cylinder (5);
the optical bracket (1) and the flange cylinder (5) are connected through the adapter cylinder (3).
8. The image diagnostic device for insulation stack vacuum rim flashover of claim 7, wherein: the output port of the photoelectric converter is a USB port;
the camera is a CCD camera;
the annular supporting frame (4) is made of aluminum alloy.
9. The image diagnostic device for insulation stack vacuum rim flashover of claim 8, wherein:
An annular cover plate (21) is arranged on the outer side surface of one end, far away from the optical bracket (1), of the flange cylinder (5).
10. An image diagnosis method for insulation stack vacuum rim flashover, characterized in that the image diagnosis apparatus for insulation stack vacuum rim flashover according to any one of claims 1 to 9 is employed, comprising the steps of:
1) the optical bracket (1) and the flange cylinder (5) extend into a piece to be detected (22), the annular supporting frame (4) is matched with the inner wall of the piece to be detected (22) to realize positioning, the annular surface formed by the optical probes (26) on all the image diagnosis holes (13) is coaxially opposite to an annular insulation stack (25) of the piece to be detected (22), the flange cylinder (5) is fixedly connected with the piece to be detected (22), and the tightness of the inner cavity of the piece to be detected (22) is ensured;
2) Starting a camera, controlling a display unit, a photoelectric detector and an oscilloscope;
3) The control display unit and the oscilloscope are observed, and if the control display unit observes an flashover integral image and the oscilloscope detects an electric pulse signal of flashover luminescence, the insulation stack has a flashover phenomenon;
4) And obtaining the flashover occurrence position and the relative moment of the insulation stack along surface according to the flashover integral image obtained in the step 3) and the corresponding electric pulse signals.
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| CN114609429B (en) * | 2022-02-25 | 2024-06-07 | 西北核技术研究所 | Stack type MV-level voltage peak measurement vacuum probe and installation method thereof |
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