A kind of gas insulation equipment internal temperature rise detection device and GIS test system

Abstract

The application provides a kind of gas insulation equipment internal temperature rise detection device, relate to high voltage transmission line and insulation equipment technical field. Wherein, gas insulation equipment internal temperature rise detection device, including closed cavity and the guide rod in closed cavity, closed cavity is provided with the first through hole for being convenient to operate in closed cavity, first through hole is connected with cover plate. The shielding layer is arranged in the closed cavity near the first through hole. The infrared thermal imager is arranged on the outside of the cover plate, the infrared thermal imager is connected with signal transmission optical fiber, part of signal transmission optical fiber is inserted into the cover plate, and the infrared thermal imager is controlled by terminal equipment. The internal heating condition of the closed cavity is detected, the actual temperature of each position in the GIL / GIS during actual operation is detected, the insulation structure analysis of the insulator under the temperature gradient condition is realized, and accurate experimental basis is provided for the in-depth study of the temperature field of GIL / GIS pipeline.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-voltage transmission lines and insulation equipment, and particularly relates to a gas insulation equipment internal temperature rise detection device and a GIS test system. BACKGROUND

[0002] A gas insulated transmission line (GIL) is a coaxial closed metal shell and conductor based on the development of gas insulated combined electric device (GIS) and uses SF6 and other gases for insulation. The GIL occupies less space, provides greater power, and can be transmitted over a long distance. The GIL is widely used in urban substations, offshore wind power, underground power transmission, extra-high voltage power transmission, and offshore converter stations. As a replacement for traditional overhead lines and power cables, the GIL has higher reliability, smaller footprint, is suitable for long-distance and large-capacity transmission, and has good sealing properties. The basin-type insulator is a coaxial cylindrical insulation structure, that is, the center conductive rod bears the voltage and current load, the outermost part is the grounding part, and the middle part is a solid insulation medium or a solid-gas combined insulation medium. Under the combined action of voltage and current load, there is Joule heat in the center conductive rod and the surrounding insulation medium. After long-term operation, the temperature near the high-voltage electrode is relatively high, and the temperature near the low-voltage electrode (ground flange or low-voltage shielding cylinder) is relatively low. Since the GIL device is operated under load all year round, the heat generated by the Joule heat in the center conductive rod increases the temperature of the conductive rod. If the temperature rise is too high, it will reduce the insulation level of the device and even cause insulation failure. When the GIL is running, the heat generated by the current-carrying conductive rod will affect the uniformity of the internal temperature distribution. The temperature distribution of the insulator, which plays a role in isolation and support in the busbar, will also be affected, and the temperature will be non-uniformly distributed. The electrical conductivity of the insulator changes, and the distribution of the electric field strength changes. Therefore, according to the specific operating conditions of the DC insulation equipment, it is particularly necessary to accurately analyze the insulation structure of the insulator under the consideration of temperature gradient. At present, when detecting the actual temperature of each position inside the GIL / GIS in actual operation, it is impossible to accurately analyze the insulation structure of the insulator under the condition of temperature gradient, so as to provide accurate experimental basis for the in-depth study of the temperature field of the GIL / GIS pipeline.

[0003] Therefore, the above technical problems need to be further solved. SUMMARY

[0004] The purpose of the embodiment of the present application is to provide a gas insulation equipment internal temperature rise detection device and a GIS test system to detect the actual temperature of each position inside the GIL / GIS in actual operation, and to accurately analyze the insulation structure of the insulator under the condition of temperature gradient.

[0005] To solve the above technical problems, embodiments of the present application provide the following technical solutions:

[0006] The present application provides a kind of gas insulation equipment internal temperature rise detection device, including closed cavity and the guide rod in the closed cavity, first through hole is provided on the closed cavity, and the first through hole is connected with cover plate, to facilitate the operation in the closed cavity;

[0007] Shielding layer is arranged in the closed cavity near the first through hole;

[0008] The outside of the cover plate is provided with an infrared thermal imager, the infrared thermal imager is connected with signal transmission optical fiber, part of the signal transmission optical fiber penetrates into the cover plate, and the infrared thermal imager is controlled by terminal equipment.

[0009] Further, the signal transmission optical fiber inside the closed cavity generates image data from the collected optical signals and transmits the acquired image data to the infrared thermal imager, and the infrared thermal imager transmits the acquired image data to the terminal equipment.

[0010] Further, the signal transmission optical fiber inside the closed cavity includes an objective lens, an infrared fiber bundle and a relay lens, the objective lens is arranged at the front end of the infrared fiber bundle, and the relay lens is located at the rear end of the infrared fiber bundle.

[0011] Further, the infrared fiber bundle includes a fiber bundle body, a cladding layer and a coating layer, the cladding layer is arranged outside the infrared fiber bundle body, and the coating layer is arranged outside the cladding layer.

[0012] Further, the signal transmission optical fiber is adhered to the inner wall of the closed cavity.

[0013] Further, the first protruding portion is arranged on the closed cavity at the first through hole, and a first space is formed between the shielding layer, the side wall of the first protruding portion and the cover plate.

[0014] Further, the cover plate is arranged at the end of the first protruding portion near the infrared thermal imager.

[0015] The shielding layer is arranged at the end of the first protruding portion away from the infrared thermal imager.

[0016] Further,

[0017] Further, the cover plate is provided with a second through hole for the signal transmission optical fiber to pass through, and the surface of the second through hole is provided with a first connector connecting the signal transmission optical fiber inside the closed cavity and the signal transmission optical fiber outside the closed cavity.

[0018] Furthermore, an interface cabinet is provided on the outside of the enclosed cavity;

[0019] The infrared thermal imager, the terminal equipment, and the signal transmission optical fiber located outside the enclosed cavity are all located inside the interface cabinet.

[0020] A GIS testing system includes an internal temperature rise detection device for gas-insulated equipment as described above.

[0021] Compared to existing technologies, the gas insulation equipment internal temperature rise detection device provided by the first aspect of this invention has a signal transmission optical fiber located outside the closed cavity and connected to an infrared thermal imager. The other end of the signal transmission optical fiber passes through the shielding layer and enters the interior of the closed cavity to collect image data inside the closed cavity and transmit the image data to the infrared thermal imager. The terminal device simultaneously receives the image data and processes and analyzes it, thereby detecting the internal heating of the closed cavity and detecting the actual temperature at various locations inside the GIL / GIS during actual operation. This enables accurate insulation structure analysis of the insulator under temperature gradient conditions, providing an accurate experimental basis for in-depth research on the temperature field of GIL / GIS pipelines. Attached Figure Description

[0022] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, with the same or corresponding reference numerals denoteing the same or corresponding parts, wherein:

[0023] Figure 1 A schematic side view of the internal temperature rise detection device of a gas-insulated device is shown.

[0024] Figure 2 A schematic diagram of the main structure of the internal temperature rise detection device of the gas-insulated equipment is shown.

[0025] Figure 3 A schematic top view of the internal temperature rise detection device of a gas-insulated device is shown.

[0026] Figure 4 A schematic diagram of a signal transmission optical fiber is shown.

[0027] Explanation of icon numbers:

[0028] 1. Enclosed cavity; 11. Guide rod; 12. First protrusion; 13. First space; 14. First through hole;

[0029] 2. Shielding layer;

[0030] 3. Cover plate; 31. First connector;

[0031] 4. Signal transmission optical fiber; 41. Relay lens; 42. Objective lens; 43. Coating layer; 44. Cladding layer; 45. Infrared fiber bundle;

[0032] 5. Infrared thermal imager;

[0033] 6. Terminal equipment. Detailed Implementation

[0034] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Unless otherwise specified, the techniques used in the embodiments are conventional means well known to those skilled in the art.

[0035] It should be noted that, unless otherwise stated, the technical or scientific terms used in this invention should be understood in their ordinary sense by those skilled in the art. In this document, relational terms such as “first” and “second” are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms “connected,” “linked,” etc., should be interpreted broadly, for example, referring to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection via an intermediate medium. The terms “comprising,” “including,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase “comprising…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] This invention provides an internal temperature rise detection device for gas-insulated equipment, combined with... Figure 1 and Figure 2The internal temperature rise detection device of the gas-insulated equipment includes a closed cavity 1 and a guide rod 11 located inside the closed cavity 1. The closed cavity 1 is provided with a first through hole 14 to facilitate operation inside the closed cavity 1, and a cover plate 3 is connected to the first through hole 14. A shielding layer 2 is provided inside the closed cavity 1 near the first through hole 14. An infrared thermal imager 5 is provided outside the cover plate 3. The infrared thermal imager 5 is connected to a signal transmission optical fiber 4. Part of the signal transmission optical fiber 4 passes through the cover plate 3 and is located inside the closed cavity 1. The infrared thermal imager 5 is controlled by a terminal device 6.

[0037] Specifically, one end of the signal transmission optical fiber 4 is located outside the enclosed cavity 1 and connected to the infrared thermal imager 5. The other end of the signal transmission optical fiber 4 passes through the cover plate 3 and the shielding layer 2 to enter the interior of the enclosed cavity 1, where it collects image data from inside the enclosed cavity 1 and transmits the image data to the infrared thermal imager 5. The terminal device 6 simultaneously receives the image data and processes and analyzes it, thereby detecting the internal heating of the enclosed cavity 1 and the actual temperature at various locations inside the GIL / GIS during actual operation. This enables accurate insulation structure analysis of the insulator under temperature gradient conditions, providing an accurate experimental basis for in-depth research on the temperature field of GIL / GIS pipelines.

[0038] The first through hole 14 is located on the closed cavity 1 and is laterally open. The first through hole 14 can be any of the following shapes: circular, rectangular, or triangular.

[0039] The guide rod is a component of the GIL / GIS equipment, used to transmit electrical energy and maintain the normal operation of the entire equipment.

[0040] To further illustrate the image data generation and transmission process, in a specific embodiment, such as... Figure 1 As shown, the signal transmission optical fiber 4 located inside the closed cavity 1 generates image data from the collected optical signals and transmits the acquired image data to the infrared thermal imager 5. The infrared thermal imager 5 then transmits the acquired image data to the terminal device 6.

[0041] In a specific embodiment, such as Figure 4 As shown, the signal transmission optical fiber 4 located in the closed cavity 1 includes an objective lens 42, an infrared optical fiber bundle 45, and a relay lens 41. The objective lens 42 is located at the front end of the infrared optical fiber bundle 45, and the relay lens is located at the rear end of the infrared optical fiber bundle 45.

[0042] Specifically, both the objective lens 42 and the relay lens 41 are located inside the enclosed cavity 1. At the same time, the signal transmission optical fiber 4 is used as the carrier for information transmission to import and export optical signals, reducing the impact on the enclosed cavity 1. The small size does not occupy the space inside the enclosed cavity 1, and the image data transmission quality is high, improving the image clarity.

[0043] The optical fiber 4, which transmits signals, has low optical attenuation, making it easier to image. Therefore, it is effective for thermal imaging inside the enclosed cavity 1.

[0044] In a specific embodiment, such as Figure 4 As shown, the infrared fiber bundle 45 is provided with a cladding 44 on the outside. The cladding 44 is provided with a coating layer 43 on the outside.

[0045] Specifically, the objective lens 42 and the relay lens 41 are both located inside the cladding 44, while the coating layer 43 is located outside the cladding 44. The cladding 44 and the coating layer 43 protect the objective lens 42, the infrared fiber bundle 45, and the relay lens 41.

[0046] In a specific embodiment, combined with Figure 1 and Figure 2 The signal transmission optical fiber 4 is adhered to the inner wall at the bottom of the closed cavity 1.

[0047] Specifically, attaching the signal transmission optical fiber 4 located inside the enclosed cavity 1 to the inner wall of the enclosed cavity 1 can prevent the formation of obvious protrusions inside the enclosed cavity 1.

[0048] The signal transmission optical fiber 4 is bonded to the inner wall of the enclosed cavity 1 by an adhesive, which can prevent the signal transmission optical fiber 4 from shaking inside the enclosed cavity 1.

[0049] In a specific embodiment, combined with Figure 1 and Figure 2 A first protrusion 12 is provided on the closed cavity 1 at the first through hole 14.

[0050] Specifically, by partially setting the first protrusion 12, the space inside the overall enclosed cavity 1 is further increased, while the impact of the equipment located outside the first protrusion 12 on the enclosed cavity 1 is reduced.

[0051] In a specific embodiment, such as Figure 1 As shown, the cover plate 3 is disposed at the end of the first protrusion 12 near the infrared thermal imager 5. The shielding layer 2 is disposed at the end of the first protrusion 12 away from the infrared thermal imager 5.

[0052] Specifically, the cover plate 3 is located at the end of the first protrusion 12 near the infrared thermal imager 5, which can further increase the space inside the overall enclosed cavity 1 and reduce the impact of the equipment located outside the first protrusion 12 on the enclosed cavity 1.

[0053] A third through hole is provided on the shielding layer 2 near the ground for the signal transmission optical fiber 4 to pass through.

[0054] The shielding layer 2 is made of metal and is coated with insulating varnish on its outer surface to shield the sharp edges and corners at the connection between the signal transmission optical fiber 4 and the cover plate 3 from discharge.

[0055] In a specific embodiment, combined with Figure 1 and Figure 3 A first space 13 is formed between the shielding layer 2, the sidewall of the first protrusion 12, and the cover plate 3.

[0056] Specifically, the first space 13 further prevents external devices from interfering with the enclosed cavity 1.

[0057] The shielding layer 2, as one side wall of the first space 13, further shields interference information from external devices.

[0058] In a specific embodiment, combined with Figure 1 and Figure 3 The cover plate 3 is provided with a second through hole through which the signal transmission optical fiber 4 passes, and the surface of the second through hole is provided with a first connector 31 that connects the signal transmission optical fiber 4 inside the closed cavity 1 and the signal transmission optical fiber 4 outside the closed cavity 1.

[0059] Specifically, the signal transmission optical fiber 4 located in the first space 13 is connected to the signal transmission optical fiber 4 outside the cover plate 3 through the first connector 31.

[0060] The second through hole and the first connector 31 are bonded together with an adhesive.

[0061] The signal transmission fiber 4 can acquire image data within a sealed and dark enclosed cavity 1. The acquired image data is transmitted to the infrared thermal imager 5 outside the enclosed cavity 1 via the optical signal of the signal transmission fiber 4 itself. This reduces image data loss during transmission and improves imaging quality.

[0062] The shielding layer 2 can also prevent discharge at the first connector 31.

[0063] According to actual needs, the signal transmission fiber 4 located outside the closed cavity 1 can also be without signal transmission, and the signal transmission fiber 4 located inside the closed cavity 1 can be connected to the first connector 31 and simultaneously connected to the transmission line in the prior art, so that the image data can be transmitted to the infrared thermal imager 5.

[0064] Depending on actual needs, there can be multiple sets of signal transmission optical fibers 4. The cover plate 3 is provided with fourth and fifth through holes for each set of signal transmission optical fibers 4 to pass through. A second connector is installed on the fourth through hole, and a third connector is installed on the fifth through hole. In other words, the number of through holes and connectors is determined by actual requirements.

[0065] To facilitate maintenance in densely populated areas and save space, an interface cabinet is installed on the outside of the enclosed cavity 1. The infrared thermal imager 5, the terminal equipment 6, and the signal transmission optical fiber 4 located outside the enclosed cavity 1 are all located inside the interface cabinet.

[0066] In this invention, a sealing groove for installing a sealing ring is provided between the first through hole 14 and the cover plate 3 to prevent air leakage at the connection between the first through hole 14 and the cover plate 3. The sealing groove can be located at the edge of the first through hole 14 or on the cover plate 3 that contacts the first through hole 14.

[0067] In this invention, the process of visualizing the sealed cavity 1 can be performed without opening the cavity 1. The image data obtained by the signal transmission fiber 4 can be observed on the terminal device 6, which reduces the number of times the sealed cavity 1 is disassembled, shortens the image data acquisition time, and greatly reduces the amount of SF6 gas required, thus saving time and cost.

[0068] In this invention, the cover plate 3 can be replaced with a viewing window with a flange.

[0069] In this invention, the terminal device 6 is equipped with a wireless transceiver module and an image recognition module, which have wireless transceiver function and image recognition function, and can remotely control the start and stop of the infrared thermal imager 5 and save image or video data.

[0070] Terminal device 6 can be any one of a desktop computer, laptop computer, tablet computer, or mobile phone.

[0071] The control system used by the terminal device 6 to simultaneously control the infrared thermal imager 5 and the signal transmission fiber optic cable 4 is a mature technology in the prior art, so it will not be described in detail.

[0072] A method for detecting internal temperature rise in gas-insulated equipment based on infrared fiber optic imaging, comprising:

[0073] The connection steps involve placing a shielding layer and a signal transmission optical fiber inside the sealed cavity, connecting the signal transmission optical fiber inside the sealed cavity with the signal transmission optical fiber outside the sealed cavity through a first connector, connecting the cover plate to the first through hole, and connecting the end of the signal transmission optical fiber outside the sealed cavity to the infrared thermal imager.

[0074] The vacuuming step involves evacuating the sealed cavity and then filling it with SF6 gas. After filling, the filling valve located on the sealed cavity is closed.

[0075] The image acquisition process involves connecting the high-voltage power supply and maintaining its stability while raising the voltage to normal operating conditions. The image data synchronously transmitted from the infrared thermal imager to the terminal device is then observed. The acquired image data is compared and analyzed with samples obtained through pre-simulation to detect overheated areas inside the sealed cavity.

[0076] Furthermore, the connection step also includes checking the airtightness of the sealed cavity after placing metal particles inside the sealed cavity.

[0077] Furthermore, during the image acquisition step, the terminal device also saves the acquired image data and the information after comparison and analysis.

[0078] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A temperature rise detection device inside a gas-insulated transmission line (GIL), the device being installed within the GIL, comprising a closed cavity and a guide rod located within the closed cavity, characterized in that, The enclosed cavity is provided with a first through hole to facilitate operation inside the enclosed cavity, and a cover plate is connected to the first through hole; A shielding layer is provided in the enclosed cavity near the first through hole; An infrared thermal imager is installed on the outside of the cover plate. The infrared thermal imager is connected to a signal transmission optical fiber. Part of the signal transmission optical fiber passes through the cover plate. The infrared thermal imager is controlled by a terminal device. The signal transmission optical fiber located within the enclosed cavity includes an objective lens, an infrared fiber bundle, and a relay lens. The objective lens is positioned at the front end of the infrared fiber bundle, and the relay lens is positioned at the rear end of the infrared fiber bundle. The cover plate is provided with a second through hole for the signal transmission optical fiber to pass through, and the surface of the second through hole is provided with a first connector that connects the signal transmission optical fiber inside the closed cavity and the signal transmission optical fiber outside the closed cavity. The optical fiber for signal transmission located inside the enclosed cavity is attached to the inner wall of the enclosed cavity.

2. The internal temperature rise detection device for gas-insulated equipment according to claim 1, characterized in that, The signal transmission optical fiber located inside the enclosed cavity collects the optical signal and generates image data, then transmits the acquired image data to the infrared thermal imager, which in turn transmits the acquired image data to the terminal device.

3. The internal temperature rise detection device for gas-insulated equipment according to claim 1, characterized in that, The infrared fiber bundle includes a fiber bundle body, a cladding, and a coating layer. The cladding is disposed outside the fiber bundle body, and the coating layer is disposed outside the cladding.

4. The internal temperature rise detection device for gas-insulated equipment according to claim 1, characterized in that, The signal transmission optical fiber is adhered to the inner wall of the enclosed cavity.

5. The internal temperature rise detection device for gas-insulated equipment according to claim 1, characterized in that, A first protrusion is provided on the closed cavity at the first through hole, and a first space is formed between the shielding layer, the side wall of the first protrusion, and the cover plate.

6. The internal temperature rise detection device for gas-insulated equipment according to claim 5, characterized in that, The cover plate is disposed at the end of the first protrusion near the side of the infrared thermal imager; The shielding layer is disposed at the end of the first protrusion on the side away from the infrared thermal imager.

7. The internal temperature rise detection device for gas-insulated equipment according to claim 1, characterized in that, An interface cabinet is provided on the outside of the enclosed cavity; The infrared thermal imager, the terminal equipment, and the signal transmission optical fiber located outside the enclosed cavity are all located inside the interface cabinet.

8. A GIS testing system, characterized in that, The device comprises an internal temperature rise detection device for gas-insulated equipment as described in any one of claims 1 to 7.

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