A visual monitoring system and diagnostic method for internal state of gas-insulated metal enclosure equipment

Abstract

The present invention relates to the field of substation monitoring technology, and more specifically, to a visual monitoring system for the internal state of a gas-insulated metal enclosure, including a high-speed imaging acquisition device, the high-speed imaging acquisition device including a high-voltage shielding cover, the high-voltage shielding cover is sealed and connected in a GIS cavity hand hole, and a high-speed camera module is installed in the high-voltage shielding cover to capture images of tiny particles of foreign matter in the GIS cavity under operating conditions through a transparent cover in the high-voltage shielding cover, and transmit the image acquisition information to a back-end processing device. The present invention can effectively solve the problem that the internal state of the GIS cavity cannot be accurately perceived, and provides a monitoring device that can be implanted in the GIS cavity, which realizes the observable, measurable, and controllable internal operating state of the GIS cavity, and promotes the development of power transmission and transformation equipment status assessment technology towards holographic, broad-spectrum, and intelligent development.

Description

Technical Field

[0001] The present invention relates to the technical field of substation monitoring, and more specifically to a visual monitoring system and a diagnostic method for the internal state of a gas-insulated metal enclosure. Background Art

[0002] In the power system, Gas Insulated Metal Enclosed Switchgear (GIS) is one of the key substation equipment, which is more and more widely used and plays a vital role in the power transmission process. GIS equipment is a closed combination of various components, which is generally not affected by the external environment, has low noise, weak electromagnetic wave interference, and less subsequent maintenance work; at the same time, the highly integrated equipment layout greatly reduces the inherent installation distance between equipment and greatly reduces the energized distance of the equipment. Due to the above advantages and characteristics, although GIS equipment is expensive, it is becoming more and more a trend for large open substations to be replaced by small-footprint, highly integrated GIS equipment in densely populated areas or large and medium-sized cities. With the continuous expansion of the scale of the power grid and the continuous improvement of power supply requirements, the growth rate of GIS equipment in the power industry has been rapid in recent years.

[0003] As the number of GIS installations increases, the voltage level and system capacity also continue to increase. At the same time, the defects and faults inside GIS equipment also increase. According to statistics on substation equipment failures in recent years, GIS equipment failures and tripping at 330 kV and above account for nearly 41%, which is the main equipment causing failure tripping. The failure rate is 0.18 times / 100 intervals / year. The causes of failures include foreign body discharge, poor assembly and installation process, component defects, etc. The operating stability of GIS equipment needs to be improved urgently.

[0004] Since GIS is a fully enclosed metal device, its internal conductive rods, insulators and other components are in a closed shell with high pressure and high field strength. The conditions of the internal components and the overall operating status of the equipment cannot be directly observed from the outside. At present, the detection methods for the status of GIS equipment are all to evaluate the operating status of the equipment through indirect means, mainly including SF6 gas detection, gas pressure observation, partial discharge detection, X-ray detection, infrared temperature measurement and other technical means. Among them, gas detection mainly indirectly evaluates the internal insulation status by measuring the changes in gas and moisture inside GIS; partial discharge detection evaluates whether there is partial discharge inside the equipment by detecting electromagnetic waves and ultrasonic signals inside GIS. Although these methods can reflect the internal status of GIS equipment to a certain extent, they all indirectly evaluate the internal status through changes in certain signal characteristics. They are indirect detection methods and can often only give a rough judgment, and cannot accurately determine the internal defect location and defect type of GIS. The formulation of maintenance strategies for such signals often depends on the technical level and experience of the detection personnel, and lacks objective and accurate equipment status information. In recent years, the application of X-ray detection technology has made it possible to observe specific parts inside GIS, but the X-ray detection process is cumbersome and the test scene is difficult to set up. It can only detect mechanical defects in specific parts, such as inadequate closing of the switch and broken parts. It cannot detect tiny defects inside GIS, partial discharge signals, poor contact and other defects. Therefore, X-ray detection can only be used as an auxiliary diagnostic method for abnormal defects inside GIS equipment, and cannot be used as a routine detection method for equipment status monitoring and live detection. Summary of the invention

[0005] The purpose of the present invention is to provide a visual monitoring system for the internal state of a gas-insulated metal enclosure, which can effectively solve the problems in the prior art.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A visual monitoring system for the internal state of a gas-insulated metal enclosure comprises an optical fiber image transmission observation device and / or a high-speed imaging acquisition device; wherein:

[0008] The optical fiber image transmission observation device is used to collect infrared, ultraviolet and visible light images inside the GIS cavity under the running state;

[0009] The high-speed imaging acquisition device is used to collect images of tiny foreign particles inside the GIS cavity during operation.

[0010] Optionally, the fiber optic image transmission observation device includes a passive optical signal acquisition array implanted inside the GIS cavity and an optical imaging device located outside the GIS cavity; the passive optical signal acquisition array is used to collect infrared light, ultraviolet light and visible light signals inside the GIS, and transmit the signals to the optical imaging device.

[0011] Optionally, the passive optical signal acquisition array is installed in a cylindrical organic glass shell, the surface of the cylindrical organic glass shell is coated with a conductive coating film, and the passive optical signal acquisition array is connected to the inside of the GIS cavity through a through hole pre-opened at the hand hole of the GIS cavity; a guide rod is provided in the center of the cylindrical organic glass shell.

[0012] Optionally, the passive optical signal acquisition array includes a light guide beam for introducing a light source from outside the GIS cavity to inside the GIS cavity and an imaging beam for collecting light source optical signals and transmitting them to an optical imaging device outside the GIS cavity.

[0013] Optionally, the image transmission bundle is an optical fiber bundle prepared based on an acid dissolution process, and is used to transmit the collected infrared light, ultraviolet light and visible light in a common optical path.

[0014] Optionally, the optical imaging device includes a beam splitter, an imaging eyepiece set, a photosensitive imaging unit and a computing unit;

[0015] The beam splitter is used to split the optical signal of the passive optical signal collection array. After each beam of light enters the dedicated eyepiece in the imaging eyepiece group, it is photoelectrically converted by the photosensitive imaging unit, and the optical signal is converted into a digital signal and transmitted to the computing unit;

[0016] The computing unit stores and transmits digital signals, fuses the coaxial simultaneous data images of infrared, ultraviolet and visible light images inside the GIS cavity, and uploads them to the peripheral device through the transmission interface.

[0017] Optionally, the spectroscope divides the optical signal of the passive optical signal acquisition array into an infrared light beam, an ultraviolet light beam and a visible light beam; the imaging eyepiece group includes an infrared imaging eyepiece for imaging the infrared light beam, an ultraviolet imaging eyepiece for imaging the ultraviolet light beam and a visible light imaging eyepiece for imaging the visible light beam.

[0018] Optionally, the high-speed imaging acquisition device includes a high-voltage shielding cover, which is sealed and connected to the hand hole of the GIS cavity. A high-speed camera module is installed in the high-voltage shielding cover to capture images of tiny particles of foreign matter inside the GIS cavity in the operating state through a transparent cover in the high-voltage shielding cover, and transmit the image capture information to the back-end processing equipment.

[0019] Optionally, the high-speed imaging acquisition device further includes a fill light unit installed in the high-voltage shielding cover to provide fill light for irradiating the interior of the GIS cavity.

[0020] Optionally, the fill light unit includes a ring-shaped LED light mounted outside the high-speed camera module.

[0021] Optionally, the high-voltage shielding cover is made of metal.

[0022] Optionally, the high-voltage shielding cover is flange-connected to the GIS cavity hand hole, and a sealing ring is provided between the high-voltage shielding cover and the GIS cavity hand hole.

[0023] Optionally, the high-speed camera module is a high-speed camera.

[0024] Optionally, the transparent cover is made of organic glass.

[0025] A method for diagnosing the internal state of a gas-insulated metal enclosure device, based on the collected images of any of the above systems, comprises the following steps:

[0026] The infrared, ultraviolet and visible light images obtained by the optical fiber image transmission observation device and / or the tiny particle foreign body images obtained by the high-speed imaging acquisition device are diagnosed through the diagnosis and recognition algorithm.

[0027] The step of diagnosing the infrared image obtained by the optical fiber image transmission observation device by using a diagnostic recognition algorithm comprises:

[0028] The normal operating temperature of the equipment inside the GIS cavity is monitored at a fixed position. When the temperature of the equipment area exceeds the temperature threshold, the equipment is judged to be defective.

[0029] The step of diagnosing the ultraviolet image obtained by the optical fiber image transmission observation device by using a diagnostic recognition algorithm includes:

[0030] When A / (w*h)>C, it is judged that there is corona discharge inside the GIS cavity;

[0031] In the formula, the area of ​​the spot is A, w and h are the width and height of the ultraviolet image respectively, and C is the threshold.

[0032] The step of diagnosing the tiny particle foreign body image obtained by the high-speed imaging acquisition device by using a diagnostic recognition algorithm includes:

[0033] The size and shape of tiny foreign particles inside the GIS cavity are calculated, and the characteristics of tiny foreign particles are calculated using image denoising and geometric feature extraction.

[0034] Beneficial effects of the present invention:

[0035] A visual monitoring system for the internal state of a gas-insulated metal enclosure of the present invention can effectively solve the problem that the internal state of a GIS cavity cannot be accurately perceived, and provides a monitoring device that can be implanted inside the GIS cavity, thereby making the internal operating state of the GIS cavity observable, measurable, and controllable, and promoting the development of power transmission and transformation equipment state assessment technology towards holographic, broad-spectrum, and intelligent development.

[0036] The advantages of the present invention are:

[0037] 1. Realize intuitive observation of the interior of GIS equipment cavity;

[0038] 2. Does not affect the internal insulation margin of GIS equipment;

[0039] 3. Realize accurate diagnosis and analysis of GIS equipment status;

[0040] 4. Promote the intelligent and digital upgrading of GIS equipment;

[0041] 5. The present invention can work in environmentally friendly gas environments such as SF6, CF4, and N2, and can also be extended to the state detection of other closed equipment, providing technical guidance for the internal state observation of high-pressure and high-electric-field equipment;

[0042] 6. As a visual alternative device for partial discharge monitoring inside GIS, the present invention can change the problem that the current GIS operation status monitoring strongly relies on partial discharge and is difficult to judge intuitively. It retains the strong insulation of gas-insulated metal enclosure equipment and can use the more mature defect monitoring and judgment methods of open equipment for long-term monitoring, which helps to completely change the operation and maintenance mode of existing GIS equipment.

[0043] The above-mentioned objects, features and advantages of the invention can be more clearly understood. The preferred embodiments are specifically described below in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 A schematic diagram of a high-speed imaging acquisition device provided by an embodiment of the present invention;

[0046] Figure 2 A schematic diagram of a fiber optic image transmission observation device provided by an embodiment of the present invention;

[0047] Figure 3 A schematic diagram of an optical imaging device provided by an embodiment of the present invention;

[0048] Figure 4 Schematic diagram of a high voltage shielding cover provided by an embodiment of the present invention Figure 1 ;

[0049] Figure 5 Schematic diagram of a high voltage shielding cover provided by an embodiment of the present invention Figure 2 ;

[0050] Figure 6 A schematic diagram of the partial structure of a high-voltage shielding cover provided in an embodiment of the present invention.

[0051] Icons: high-voltage shielding cover 1; cylindrical cover body 101; mounting flange 102; retaining ring 103; limiting ring 104; linked outer gear ring 105; rotating gear 106; rotating shaft 107; arc baffle 108; locking push rod 109; compression spring 110; high-speed camera module 2; fill light unit 3; monitoring image diagnosis module 4; transparent cover 5; passive optical signal acquisition array 7; through hole 8; cylindrical plexiglass shell 9; guide rod 10. DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0053] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0054] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0055] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0056] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that can be implemented in this application, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in this application without affecting the effects that can be produced by this application and the purposes that can be achieved. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of narration, and are not used to limit the scope of the implementation of this application. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of this application without substantial change in the technical content.

[0057] The following is combined with Figure 1-6 The present invention is described in further detail.

[0058] Embodiment 1

[0059] like Figure 1-6 As shown, a visual monitoring system for the internal state of a gas-insulated metal enclosure includes a fiber optic image transmission observation device and / or a high-speed imaging acquisition device; wherein the fiber optic image transmission observation device is used to collect infrared light, ultraviolet light and visible light images inside the GIS cavity under the operating state; the high-speed imaging acquisition device is used to collect images of tiny particle foreign matter inside the GIS cavity under the operating state.

[0060] A visual monitoring system for the internal state of a gas-insulated metal enclosure device of the present invention is used for holographic observation of the internal state of the gas-insulated metal enclosure device. A high-speed imaging acquisition device that can be implanted inside a GIS cavity is provided inside, and images of tiny particle foreign matter inside the GIS cavity under operating conditions are acquired. An optical fiber image transmission observation device is provided inside, and infrared, ultraviolet and visible light images of the inside of the GIS cavity under operating conditions are acquired. Thus, visual monitoring of the internal state of the GIS cavity is achieved.

[0061] The high-speed imaging acquisition device includes a high-voltage shielding cover 1, which is sealed and connected to the hand hole of the GIS cavity. A high-speed camera module 2 is installed in the high-voltage shielding cover 1 to capture images of tiny particles of foreign matter inside the GIS cavity under operating conditions through a transparent cover plate 5 in the high-voltage shielding cover 1, and transmit the image acquisition information to the monitoring image diagnosis module 4.

[0062] The monitoring image diagnosis module 4 involves a quick diagnosis and identification algorithm for tiny foreign matter images, which needs to be calculated based on the size and shape of the foreign matter in the GIS, and uses a specific image noise reduction and geometric feature extraction method to calculate the characteristics of tiny foreign matter. The monitoring image diagnosis module 4 can realize accurate analysis and calculation of the size, quantity, location, etc. of foreign matter inside the GIS.

[0063] A visual monitoring system for the internal state of a gas-insulated metal enclosure device of the present invention is used for holographic observation of the internal state of the gas-insulated metal enclosure device. A high-speed imaging acquisition device that can be implanted in a GIS cavity is provided inside the device. A high-speed camera module 2 is implanted in the GIS cavity to realize image acquisition of tiny particle foreign matter inside the device in a running state. The transparent cover plate 5 in the high-voltage shielding cover 1 is made of organic glass so that the high-speed camera module 2 can detect tiny foreign matter inside the GIS cavity. The high-voltage shielding cover 1 is made of metal, and the connection part between the high-voltage shielding cover 1 and the GIS cavity shell is designed to be flange-connected. A sealing ring is placed between the high-voltage shielding cover 1 and the GIS cavity shell. The entire high-voltage shielding cover 1 is fixed by bolts and fits tightly to the surface of the GIS cavity hand hole, which can simulate the conductive properties of the GIL and GIS busbar metal shell, while ensuring high air pressure in the cavity; after the image information collected by the high-speed camera module 2 is transmitted to the monitoring image diagnosis module 4, the monitoring image diagnosis module 4 can realize accurate analysis and calculation of the size, quantity, position, etc. of foreign matter inside the GIS, thereby realizing the observable, measurable and controllable operation status of the GIS, and promoting the development of power transmission and transformation equipment status assessment technology towards holographic, broad-spectrum and intelligent development.

[0064] The high-speed imaging acquisition device also includes a fill light unit 3 installed in the high-voltage shielding cover 1 to illuminate the inside of the GIS cavity. The high-speed camera module 2 is located at the bottom of the entire GIS cavity. In order to ensure the clarity of the image captured by the high-speed camera module 2 inside the GIS cavity, the fill light unit 3 is installed in the high-voltage shielding cover 1 to ensure the shooting range of the high-speed camera module 2. After the high-speed camera module 2 captures the particle motion image, it is transmitted to the monitoring image diagnosis module 4 to process the image and then detect it.

[0065] The fill light unit 3 includes a ring-shaped LED light which is sleeved on the outer side of the high-speed camera module 2 .

[0066] The high voltage shielding cover 1 is made of metal.

[0067] The high-voltage shielding cover 1 is flange-connected to the hand hole of the GIS cavity, and a sealing ring is provided between the high-voltage shielding cover 1 and the hand hole of the GIS cavity.

[0068] The high-speed camera module 2 is a high-speed camera.

[0069] The transparent cover plate 5 is made of organic glass.

[0070] The high-speed camera module 2 is arranged in the high-voltage shielding cover 1, and is connected to the power supply outside the high-voltage shielding cover 1 through a communication data line, and the data is transmitted to the signal processing unit; the high-speed camera module 2 implantation technology requires designing a closed high-voltage shielding cover 1 according to the hand hole size of the GIS cavity, and connecting the high-speed camera module 2 and the power supply from the outside to the high-voltage shielding cover 1 will not affect the original electric field distribution and high pressure environment of the GIS cavity.

[0071] The high-voltage shielding cover 1 is provided with a central guide rod, which runs through the entire closed high-voltage shielding cover 1 and is connected to a high-voltage power supply as a high-voltage electrode, and the outer shell serves as a ground electrode.

[0072] The gas-insulated metal enclosure internal state visual monitoring system further comprises an optical fiber image transmission observation device that can be implanted inside the GIS cavity to collect the internal optical signal of the GIS device in the operating state and convert it into an image.

[0073] The fiber optic image transmission observation device includes a passive optical signal acquisition array 7 implanted inside the GIS cavity and an optical imaging device located outside the GIS cavity; the passive optical signal acquisition array 7 is used to collect infrared light, ultraviolet light and visible light signals inside the GIS and transmit the signals to the optical imaging device.

[0074] The passive optical signal acquisition array 7 is installed in a cylindrical organic glass shell 9, and the surface of the cylindrical organic glass shell 9 is plated with a conductive coating film. The passive optical signal acquisition array 7 is connected to the inside of the GIS cavity through a through hole 8 pre-opened at the hand hole of the GIS cavity; a guide rod 10 is provided in the center of the cylindrical organic glass shell 9. The passive optical signal acquisition array 7 implanted in the GIS cavity needs to be protected by a cylindrical organic glass shell 9, and a thin conductive coating film is plated on the surface of the cylindrical organic glass shell 9; a metal adapter plate is designed on the cylindrical organic glass shell 9, and the image transmission beam passes through the center of the metal adapter plate. The metal adapter plate is connected to the GIS shell through a flange to ensure the overall air tightness of the GIS cavity.

[0075] The passive optical signal acquisition array 7 includes a light guide beam for introducing a light source from outside the GIS cavity to inside the GIS cavity and an image transmission beam for collecting the light source light signal and transmitting it to the optical imaging device outside the GIS cavity. The passive optical signal acquisition array 7 is designed to be made of non-metallic materials to avoid affecting the electric field distribution inside the GIS cavity; the passive optical signal acquisition array 7 can withstand high field strength and high pressure working environment and can be used stably inside the GIS equipment for more than 10 years; the image transmission beam transmits the signal to the external optical imaging device through a customized conversion flange, and the conversion flange should be able to meet the sealing of the GIS equipment housing (gas leakage is less than 0.5% / year at a relative pressure of 0.7MPa).

[0076] The image transmission bundle is an optical fiber bundle prepared based on the acid dissolution process, which transmits the collected ultraviolet light, visible light and infrared light in a common optical path.

[0077] The optical imaging device is used to digitally image the optical signal and perform visual observation and diagnostic analysis, and realize the coaxial simultaneous data image fusion of the ultraviolet, infrared and visible light images inside the GIS equipment through the light splitting and re-fusion technology; the optical imaging device includes a spectroscope, an imaging eyepiece group, a photosensitive imaging unit and a computing unit; the spectroscope is used to split the optical signal of the passive optical signal acquisition array 7, and after each beam of light enters the dedicated eyepiece in the imaging eyepiece group, it is photoelectrically converted by the optical imaging unit, and the optical signal is converted into an electrical signal and then converted into a digital signal and transmitted to the computing unit, so that the digital signal is stored and transmitted by the computing unit, and the three-light image fusion is performed, and it is uploaded to the peripheral device through the transmission interface. After passing through the spectroscope, the outgoing optical signal is divided into three beams, namely ultraviolet light, visible light and infrared light. After the three beams of light enter the dedicated eyepiece respectively, the optical signal is converted into an electrical signal and then converted into a digital signal by the CMOS through photoelectric conversion. The computing unit stores and transmits these signals, and performs three-light image fusion, and finally can be uploaded to the peripheral device through the transmission interface.

[0078] The spectroscope divides the optical signal of the passive optical signal acquisition array 7 into an ultraviolet light beam, a visible light beam and an infrared light beam; the imaging eyepiece group includes an ultraviolet imaging eyepiece for imaging the ultraviolet light beam, a visible light imaging eyepiece for imaging the visible light beam and an infrared imaging eyepiece for imaging the infrared light beam.

[0079] A thin conductive coating film 6 is plated on the inner side of the transparent cover plate 5 .

[0080] The GIS cavity internal monitoring image diagnosis module 4 involves the problem of rapid defect diagnosis for three types of typical optical images.

[0081] Infrared images are not limited by the light inside the GIS cavity and can quickly detect overheating of the equipment. Therefore, for the visual monitoring device of the present invention, the normal operating temperature of the equipment in the air chamber is monitored at a fixed position. When the temperature in the equipment area is abnormal and exceeds the temperature threshold t, the equipment defect can be quickly discovered. According to the diagnostic rules of DLT664-2016 and the difference in the type of air chamber where the device is located, different values ​​of t can be obtained.

[0082] The ultraviolet image mainly focuses on the external insulation defects of the equipment. When corona discharge occurs, it can be preliminarily determined that there is a problem with the external insulation of the equipment inside the cavity. The defect can be directly determined based on the area of ​​the spot area. Let the area of ​​the spot area be A, and the width and height of the ultraviolet image be w and h respectively.

[0083] When A / (w*h)>1 / 100, it can be considered that corona discharge exists inside the GIS cavity.

[0084] According to the monitoring image diagnosis module 4 in the high-speed imaging acquisition device described above, the size, shape and other characteristic quantities of foreign matter in the GIS cavity can be automatically obtained; by summarizing the characteristics of common suspended foreign matter in the GIS cavity, it can be quickly determined whether the foreign matter is an abnormal event that affects the operation of the equipment.

[0085] The high-voltage shielding cover 1 includes a cylindrical cover body 101, and a mounting flange 102 is fixed at one end of the cylindrical cover body 101 to be sealed and connected to the flange connection of the hand hole of the GIS cavity through the mounting flange 102 and bolts; a retaining ring 103 is fixed on the inner side of the cylindrical cover body 101 to limit the inner side surface of the transparent cover plate 5, and a limiting ring 104 is fixed on the outer side surface of the retaining ring 103 to retain and limit the outer ring surface of the transparent cover plate 5, and a block assembly is fixed on the outer side surface of the retaining ring 103, and the block assembly can be retained on the outer side surface of the transparent cover plate 5 for limiting. A mounting flange 102 is provided at one end of the high-voltage shielding cover 1 to facilitate its connection and installation with the GIS cavity. An annular groove is provided on the outer side of the mounting flange 102 to install a sealing rubber ring to improve the flange connection sealing between the mounting flange 102 and the hand hole of the GIS cavity. A retaining ring 103 is fixed on the inner side of the cylindrical cover body 101. One side of the transparent cover plate 5 is sealed on the retaining ring 103. The outer ring surface of the transparent cover plate 5 is sealed on the inner side of the limiting ring 104. A plurality of guide edges are evenly fixed on the inner side of the limiting ring 104. The plurality of guide edges are slidably fitted in a plurality of guide grooves on the outer ring surface of the transparent cover plate 5 to prevent the transparent cover plate 5 from rotating and improve the stability of the fixing of the transparent cover plate 5. A clamping block assembly is fixed on the outer side of the retaining ring 103, which can be clamped on the outer side of the transparent cover plate 5 for limiting, and the installation and removal of the transparent cover plate 5 does not require the removal of bolts, so the loading and unloading is very convenient.

[0086] The block assembly includes a linkage outer gear ring 105 rotatably engaged with the outer side of the limit ring 104 and a plurality of block units; the block unit includes a rotating gear 106 meshing with the linkage outer gear ring 105, the rotating gear 106 is fixed on a rotating shaft 107, the inner end of the rotating shaft 107 rotates on the outer side of the blocking ring 103, one end of an arc-shaped baffle 108 is fixed to the outer end of the rotating shaft 107 so as to be blocked on the outer side of the transparent cover 5 through the arc-shaped baffle 108, and the other end of the arc-shaped baffle 108 is threadedly engaged with a locking push rod 109 so as to be pressed on the outer side of the transparent cover 5 through the locking push rod 109; a compression spring 110 is fixed between the arc-shaped baffle 108 and the inner side of the cylindrical cover body 101. When the block assembly is in use, under normal conditions, the arc baffle 108 is kept blocked on the outer side of the transparent cover 5 under the elastic force of the compression spring 110. When the transparent cover 5 needs to be removed, the arc baffle 108 is pushed outward to drive it to separate from the transparent cover 5. When a arc baffle 108 is controlled to rotate, the arc baffle 108 can drive the rotating shaft 107 connected to it to rotate, and the rotation of the rotating shaft 107 drives the rotating gear 106 connected to it to rotate, thereby driving the linkage outer cover 5 through the rotating gear 106. The gear ring 105 rotates, and drives the rotating gears 106 of other block units to rotate by linking the outer gear ring 105, and finally drives the arc baffles 108 of multiple block units to release the limit on the transparent cover 5, and the operation is very convenient; when the arc baffle 108 limits the transparent cover 5, it can also be tightened on the transparent cover 5 by rotating the locking push rod 109, thereby improving the stability of the transparent cover 5, and can compress the rubber sealing pad between the transparent cover 5 and the blocking ring 103, so as to improve the sealing effect.

[0087] The present invention also discloses a method for back-end data processing using the above system, comprising the following steps:

[0088] Step 1: Turn on the fill light unit 3, the high-speed camera and the monitoring image diagnosis module 4 to collect images;

[0089] Step 2: After obtaining the image, the back-end processing application software of the monitoring image diagnosis module 4 performs correction processing on the captured image according to the preset image gamma value, which is used to correct a nonlinear correction of the image data due to the nonlinear response of the display, etc., so as to greatly improve the image quality;

[0090] Step 3: The back-end application software realizes automatic focusing through the output port of the drivable automatic zoom lens on the high-speed camera, and then the system converts the collected image information into coordinate points in the X and Y directions, with the horizontal direction being the X direction and the vertical direction being the Y direction, to determine the key points (the starting point, end point and tangent points of some arcs of metal foreign matter, etc.), and accurately obtain the number and attachment position of the particles in the cavity, as well as the specific attachment conditions, such as the concave surface, convex surface of the basin insulator or the high-voltage side and low-voltage side of the center guide rod; finally, the image denoising and geometric feature extraction methods are used to calculate the characteristics of tiny foreign matter.

[0091] Embodiment 2

[0092] like Figure 1-6 As shown, a method for diagnosing the internal state of a gas-insulated metal enclosure is performed based on the collected images of the system described in Example 1, and includes the following steps:

[0093] The infrared, ultraviolet and visible light images obtained by the optical fiber image transmission observation device and / or the tiny particle foreign body images obtained by the high-speed imaging acquisition device are diagnosed through the diagnosis and recognition algorithm.

[0094] The step of diagnosing the infrared image obtained by the optical fiber image transmission observation device by using a diagnostic recognition algorithm comprises:

[0095] The normal operating temperature of the equipment inside the GIS cavity is monitored at a fixed position. When the temperature of the equipment area exceeds the temperature threshold, the equipment is judged to be defective.

[0096] The step of diagnosing the ultraviolet image obtained by the optical fiber image transmission observation device by using a diagnostic recognition algorithm includes:

[0097] When A / (w*h)>C, it is judged that there is corona discharge inside the GIS cavity;

[0098] In the formula, the area of ​​the spot is A, w and h are the width and height of the ultraviolet image respectively, and C is the threshold.

[0099] The step of diagnosing the tiny particle foreign body image obtained by the high-speed imaging acquisition device by using a diagnostic recognition algorithm includes:

[0100] The size and shape of tiny foreign particles inside the GIS cavity are calculated, and the characteristics of tiny foreign particles are calculated using image denoising and geometric feature extraction.

[0101] A method for diagnosing the internal state of a gas-insulated metal enclosure device of the present invention can diagnose infrared light, ultraviolet light and visible light images obtained by a fiber optic image transmission observation device and / or tiny particle foreign matter images obtained by a high-speed imaging acquisition device through a diagnostic recognition algorithm. The diagnosis has good accuracy and can achieve accurate diagnostic analysis of the GIS equipment status.

[0102] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of this application, several improvements and modifications can be made to this application, and these improvements and modifications also fall within the scope of protection of the claims of this application.

[0103] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. A visual monitoring system for the internal state of a gas-insulated metal enclosure, characterized in that: It includes an optical fiber image transmission observation device and / or a high-speed imaging acquisition device; wherein, The optical fiber image transmission observation device is used to collect infrared, ultraviolet and visible light images inside the GIS cavity under the running state; The high-speed imaging acquisition device is used to collect images of tiny foreign particles inside the GIS cavity in the running state; The high-speed imaging acquisition device comprises a high-voltage shielding cover (1), which is sealed and connected to a hand hole of a GIS cavity. A high-speed camera module (2) is installed in the high-voltage shielding cover (1) to acquire images of tiny foreign particles in the GIS cavity in an operating state through a transparent cover plate (5) in the high-voltage shielding cover (1); The high-speed imaging acquisition device further comprises a fill light unit (3) installed in the high-voltage shielding cover (1) to illuminate the interior of the GIS cavity; the fill light unit (3) comprises a ring-shaped LED lamp mounted on the outside of the high-speed camera module (2); The high-voltage shielding cover (1) comprises a cylindrical cover body (101), one end of which is fixedly connected to a flange (102); a retaining ring (103) is fixed on the inner side of the cylindrical cover body (101), a limiting ring (104) is fixed on the outer side of the retaining ring (103), and a clamping block assembly is fixed on the outer side of the retaining ring (103); the clamping block assembly comprises a linkage outer gear ring (105) rotatably engaged with the outer side of the limiting ring (104) and a plurality of clamping block units; the clamping block units The element comprises a rotating gear (106) meshing with a linked outer gear ring (105); the rotating gear (106) is fixed on a rotating shaft (107); the inner end of the rotating shaft (107) rotates on the outer side of a retaining ring (103); one end of an arc-shaped baffle (108) is fixed to the outer end of the rotating shaft (107); the other end of the arc-shaped baffle (108) is threadedly matched with a locking push rod (109); a compression spring (110) is fixed between the arc-shaped baffle (108) and the inner side of the cylindrical cover body (101).

2. A visual monitoring system for internal status of a gas-insulated metal enclosure according to claim 1, characterized in that: The optical fiber image transmission observation device comprises a passive optical signal acquisition array (7) implanted in the GIS cavity and an optical imaging device located outside the GIS cavity; The passive optical signal collection array (7) is used to collect infrared light, ultraviolet light and visible light signals inside the GIS, and transmit the signals to the optical imaging device.

3. A visual monitoring system for internal status of a gas-insulated metal enclosure according to claim 2, characterized in that: The passive optical signal acquisition array (7) is installed in a cylindrical organic glass shell (9), the surface of the cylindrical organic glass shell (9) is plated with a conductive coating film, and the passive optical signal acquisition array (7) is connected to the inside of the GIS cavity through a through hole (8) pre-opened at the hand hole of the GIS cavity; a guide rod (10) is provided at the center of the cylindrical organic glass shell (9).

4. A visual monitoring system for internal status of a gas-insulated metal enclosure according to claim 3, characterized in that: The passive optical signal acquisition array (7) comprises a light guide beam for introducing a light source from outside the GIS cavity into the GIS cavity and an imaging beam for collecting light source optical signals and transmitting them to an optical imaging device outside the GIS cavity.

5. A visual monitoring system for internal status of a gas-insulated metal enclosure according to claim 4, characterized in that: The image transmission bundle is an optical fiber bundle prepared based on an acid dissolution process and is used to transmit the collected infrared light, ultraviolet light and visible light in a common optical path.

6. A visual monitoring system for internal status of a gas-insulated metal enclosure according to claim 2, characterized in that: The optical imaging device includes a beam splitter, an imaging eyepiece set, a photosensitive imaging unit and a computing unit; The beam splitter is used to split the light signal of the passive light signal collection array (7), and after each light beam enters the dedicated eyepiece in the imaging eyepiece group, it is photoelectrically converted by the photosensitive imaging unit, and the light signal is converted into a digital signal and transmitted to the calculation unit; The computing unit stores and transmits digital signals, fuses the coaxial simultaneous data images of infrared, ultraviolet and visible light images inside the GIS cavity, and uploads them to the peripheral device through the transmission interface.

7. A visual monitoring system for internal status of a gas-insulated metal enclosure according to claim 6, characterized in that: The spectroscope separates the optical signal of the passive optical signal collection array (7) into an infrared light beam, an ultraviolet light beam and a visible light beam; the imaging eyepiece group comprises an infrared imaging eyepiece for imaging the infrared light beam, an ultraviolet imaging eyepiece for imaging the ultraviolet light beam and a visible light imaging eyepiece for imaging the visible light beam.

8. A method for diagnosing the internal state of a gas-insulated metal enclosure, characterized in that: Diagnosis based on collected images of a visual monitoring system for the internal state of a gas-insulated metal enclosure device includes the following steps: Diagnose the infrared, ultraviolet and visible light images obtained by the optical fiber image transmission observation device and / or the tiny particle foreign body images obtained by the high-speed imaging acquisition device through the diagnosis and recognition algorithm; The visual monitoring system for the internal state of the gas-insulated metal enclosure comprises an optical fiber image transmission observation device and / or a high-speed imaging acquisition device; wherein: The optical fiber image transmission observation device is used to collect infrared, ultraviolet and visible light images inside the GIS cavity under the running state; The high-speed imaging acquisition device is used to collect images of tiny foreign particles inside the GIS cavity in the running state; The high-speed imaging acquisition device comprises a high-voltage shielding cover (1), which is sealed and connected to a hand hole of a GIS cavity. A high-speed camera module (2) is installed in the high-voltage shielding cover (1) to acquire images of tiny foreign particles in the GIS cavity in an operating state through a transparent cover plate (5) in the high-voltage shielding cover (1); The high-speed imaging acquisition device further comprises a fill light unit (3) installed in the high-voltage shielding cover (1) to illuminate the interior of the GIS cavity; the fill light unit (3) comprises a ring-shaped LED lamp mounted on the outside of the high-speed camera module (2); The high-voltage shielding cover (1) comprises a cylindrical cover body (101), one end of which is fixedly connected to a flange (102); a retaining ring (103) is fixed on the inner side of the cylindrical cover body (101), a limiting ring (104) is fixed on the outer side of the retaining ring (103), and a clamping block assembly is fixed on the outer side of the retaining ring (103); the clamping block assembly comprises a linkage outer gear ring (105) rotatably engaged with the outer side of the limiting ring (104) and a plurality of clamping block units; the clamping block units The element comprises a rotating gear (106) meshing with a linked outer gear ring (105); the rotating gear (106) is fixed on a rotating shaft (107); the inner end of the rotating shaft (107) rotates on the outer side of a retaining ring (103); one end of an arc-shaped baffle (108) is fixed to the outer end of the rotating shaft (107); the other end of the arc-shaped baffle (108) is threadedly matched with a locking push rod (109); a compression spring (110) is fixed between the arc-shaped baffle (108) and the inner side of the cylindrical cover body (101).

9. A method for diagnosing internal status of a gas-insulated metal enclosure according to claim 8, characterized in that: The optical fiber image transmission observation device comprises a passive optical signal acquisition array (7) implanted in the GIS cavity and an optical imaging device located outside the GIS cavity; The passive optical signal collection array (7) is used to collect infrared light, ultraviolet light and visible light signals inside the GIS, and transmit the signals to the optical imaging device.

10. A method for diagnosing internal status of a gas-insulated metal enclosure according to claim 9, characterized in that: The passive optical signal acquisition array (7) is installed in a cylindrical organic glass shell (9), the surface of the cylindrical organic glass shell (9) is plated with a conductive coating film, and the passive optical signal acquisition array (7) is connected to the inside of the GIS cavity through a through hole (8) pre-opened at the hand hole of the GIS cavity; a guide rod (10) is provided at the center of the cylindrical organic glass shell (9).

11. A method for diagnosing internal status of a gas-insulated metal enclosure according to claim 10, characterized in that: The passive optical signal acquisition array (7) comprises a light guide beam for introducing a light source from outside the GIS cavity into the GIS cavity and an imaging beam for collecting light source optical signals and transmitting them to an optical imaging device outside the GIS cavity.

12. A method for diagnosing internal status of a gas-insulated metal enclosure according to claim 11, characterized in that: The image transmission bundle is an optical fiber bundle prepared based on an acid dissolution process and is used to transmit the collected infrared light, ultraviolet light and visible light in a common optical path.

13. A method for diagnosing internal status of a gas-insulated metal enclosure according to claim 9, characterized in that: The optical imaging device includes a beam splitter, an imaging eyepiece set, a photosensitive imaging unit and a computing unit; The beam splitter is used to split the light signal of the passive light signal collection array (7), and after each light beam enters the dedicated eyepiece in the imaging eyepiece group, it is photoelectrically converted by the photosensitive imaging unit, and the light signal is converted into a digital signal and transmitted to the calculation unit; The computing unit stores and transmits digital signals, fuses the coaxial simultaneous data images of infrared, ultraviolet and visible light images inside the GIS cavity, and uploads them to the peripheral device through the transmission interface.

14. A method for diagnosing internal status of a gas-insulated metal enclosure according to any one of claims 8 to 13, characterized in that: The step of diagnosing the infrared image obtained by the optical fiber image transmission observation device by using a diagnostic recognition algorithm comprises: The normal operating temperature of the equipment inside the GIS cavity is monitored at a fixed position. When the temperature of the equipment area exceeds the temperature threshold, the equipment is judged to be defective.

15. A method for diagnosing internal status of a gas-insulated metal enclosure according to any one of claims 8 to 13, characterized in that: The step of diagnosing the ultraviolet image obtained by the optical fiber image transmission observation device by using a diagnostic recognition algorithm includes: When A / (w*h)>C, it is judged that there is corona discharge inside the GIS cavity; In the formula, the area of ​​the spot is A, w and h are the width and height of the ultraviolet image respectively, and C is the threshold.

16. A method for diagnosing internal status of a gas-insulated metal enclosure according to any one of claims 8 to 13, characterized in that: The step of diagnosing the tiny particle foreign body image obtained by the high-speed imaging acquisition device by using a diagnostic recognition algorithm includes: The size and shape of tiny foreign particles inside the GIS cavity are calculated, and the characteristics of tiny foreign particles are calculated using image denoising and geometric feature extraction.

Images