Intelligent temperature measuring device for gas insulated switchgear

Abstract

The invention relates to the technical field of optical fiber temperature measuring devices, in particular to an intelligent temperature measuring device for a gas insulated switchgear. The sensing part comprises a temperature sensing probe, a conduction optical fiber and a conduction interface; the temperature sensing probe is used for acquiring the internal temperature of the to-be-measured gas-insulated switchgear; the conduction optical fiber is used for transmitting internal temperature in an optical signal form; the sensing part is used for acquiring the internal temperature of the to-be-measured gas-insulated switchgear and transmitting the internal temperature to the conduction interface through the conduction optical fiber in the form of an optical signal; the transmission part is connected with the induction part and comprises an ST coupler and a receiving interface; the transmission part is used for receiving and conducting a single output signal; through the temperature sensing probe and the conduction optical fiber which are connected in an integrated mode and an efficient optical signal transmission mode, the device can accurately obtain and transmit the internal temperature of the gas-insulated switchgear in real time. The arrangement of the phase change material layer further protects the temperature sensing probe, prevents the temperature sensing probe from being damaged due to high temperature, and ensures the accuracy and reliability of temperature measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber temperature measuring devices, and in particular to an intelligent temperature measuring device for an inflatable cabinet. Background Art

[0002] The gas cabinet is an important part of the power system. Its key components such as contacts, busbars, cable connectors, etc. may generate heat under high current and long-term operation. If the heat dissipation is not timely or the contact resistance is too large, the temperature will rise, causing overheating failure. Overheating will not only reduce the service life of the equipment, but also cause aging of the insulation material, and even cause serious accidents such as short circuits and fires. Therefore, real-time monitoring of the internal temperature of the gas cabinet can timely detect and deal with overheating problems, avoid accidents, and ensure the safe operation of the power system.

[0003] Therefore, how to accurately obtain the internal temperature of the gas cabinet is of utmost importance to ensure the normal operation of the gas cabinet. For example, the prior art discloses an optical fiber temperature sensor applied to the gas cabinet, including an outer protective shell, a connector fixedly connected to the left surface of the outer protective shell, a first groove provided on the side surface of the outer protective shell, a fixing ring fixedly connected to the outer surface of the connector, a threaded structure fixedly connected to the left end of the connector, a sleeve threadedly connected to the outer surface of the threaded structure, and an optical fiber body fixedly connected to the inside of the sleeve. The optical fiber temperature sensor applied to the gas cabinet is composed of an optical fiber temperature sensor, a metal conduit and an ST coupler through a built-in optical fiber. The built-in optical fiber temperature sensor is composed of an integrated temperature sensor composed of a sensing part and an optical fiber at one end and an integral structure composed of an ST coupler at the other end. It can be directly cast in a cable socket, which can increase the withstand voltage value and avoid electromagnetic interference, and the length of the internal optical fiber can be customized.

[0004] However, in the above-mentioned technical solution of the fiber optic temperature sensor applied to the gas cabinet, when the fiber optic temperature sensor is placed in a high temperature environment for a long time, especially when the internal temperature of the gas cabinet frequently exceeds the maximum operating temperature threshold of the fiber optic temperature sensor, it will cause the fiber optic temperature sensor to suffer irreversible damage, resulting in distortion of the internal temperature of the gas cabinet obtained by the fiber optic temperature sensor, thereby causing unreliability in monitoring the internal temperature of the gas cabinet. Summary of the invention

[0005] The purpose of the present invention is to provide an intelligent temperature measuring device for an inflatable cabinet to solve the problem in the related art that when the optical fiber temperature sensor is placed in a high temperature environment for a long time, especially when the internal temperature of the inflatable cabinet frequently exceeds the maximum operating temperature threshold of the optical fiber temperature sensor, the optical fiber temperature sensor will suffer irreversible damage, resulting in distortion of the internal temperature of the inflatable cabinet obtained by the optical fiber temperature sensor, thereby causing unreliability in monitoring the internal temperature of the inflatable cabinet.

[0006] To this end, the present invention provides an intelligent temperature measuring device for an inflatable cabinet, comprising: The sensing part includes a temperature sensing probe, a transmission optical fiber and a transmission interface; Wherein, the temperature sensing probe is used to obtain the internal temperature of the inflatable cabinet to be tested; The transmission optical fiber is used to transmit the internal temperature in the form of an optical signal; The sensing part is used to obtain the internal temperature of the inflatable cabinet to be tested, and transmit the internal temperature to the conductive interface by means of an optical signal through the conductive optical fiber; The transmission part is connected to the induction part and includes an ST coupler and a receiving interface; The transmission unit is used to receive one or more optical signals in the transmission optical fiber and combine them to form a single output signal; The transmission interface is connected to the receiving interface via threads.

[0007] The transmission interface is connected to the receiving interface by threaded engagement, specifically: The inner surface of the conductive interface is provided with a threaded opening; The outer surface of the receiving interface is provided with a threaded opening; The diameter of the transmission interface is larger than the diameter of the receiving interface.

[0008] One end of the sensing part is the temperature sensing probe, and the other end is the conduction interface, specifically: The temperature sensing probe is integratedly connected to the conductive optical fiber, and the conductive optical fiber is integratedly connected to the conductive interface to form the sensing part.

[0009] The conduction interface is a hollow structure, and a protruding conduction socket is arranged at the inner center of the conduction interface.

[0010] The conducting interface, the receiving interface and the raised conducting socket are all made of copper.

[0011] The transmission optical fiber is composed of a transmission fiber core and a protective layer, specifically: The protective layer is coated on the outer surface of the conductive fiber core. The material of the protective layer is polytetrafluoroethylene and the thickness is 2 mm.

[0012] The ST coupler is symmetrically provided with a groove having the same depth.

[0013] Two casting points are symmetrically arranged at the same level on the outer surface of the ST coupler; Wherein, the two castings are symmetrically arranged, and any casting point is equidistant from the groove horizontally.

[0014] The temperature sensing probe is also coated with a phase change material layer, specifically: When the internal temperature is greater than a threshold temperature, the phase change material in the phase change material layer absorbs heat and melts from a solid state to a liquid state, so that the sensing temperature of the temperature sensing probe is not greater than the threshold temperature.

[0015] When the internal temperature decreases from greater than the threshold temperature to less than the threshold temperature, the phase change material in the phase change material layer gradually cools and solidifies from a liquid state to a solid state; The physical state of the phase change material in the phase change material layer is only determined by the internal temperature, and the phase change material can be transformed from liquid to solid and from solid to liquid any number of times.

[0016] The beneficial effects of the present invention are: The present invention provides an intelligent temperature measuring device for an inflatable cabinet, which can monitor the internal temperature of the inflatable cabinet in real time and accurately by integrating a high-precision temperature measuring device. Through an integrated temperature sensing probe and a conductive optical fiber, and an efficient optical signal transmission method, the device can accurately and real-time obtain and transmit the internal temperature of the inflatable cabinet. The provision of a phase change material layer further protects the temperature sensing probe from being damaged by high temperature, thereby ensuring the accuracy and reliability of temperature measurement.

[0017] Furthermore, when the internal temperature of the phase change material layer exceeds the threshold temperature, it can absorb heat and melt, thereby reducing the temperature of the temperature sensor and preventing it from being damaged by high temperature. When the temperature drops below the threshold, the phase change material can solidify again and continue to provide protection for the temperature sensor. This mechanism enables the device to operate stably for a long time in a high temperature environment, improves its high temperature resistance, and thus ensures the accuracy and reliability of temperature measurement.

[0018] Furthermore, by protecting the temperature sensing probe from high temperature damage, the phase change material layer helps to extend the service life of the entire temperature measuring device, which reduces the cost of replacement and maintenance and improves the economy and practicality of the equipment.

[0019] Furthermore, the transmission interface and the receiving interface are connected by threaded engagement, making the installation and removal process easier. This connection method also provides good sealing performance, preventing external factors such as dust and moisture from affecting the device, and further improving the reliability and stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural block diagram of an intelligent temperature measuring device for an inflatable cabinet in an embodiment of the present invention; Figure 2 Schematic diagram of the structure of an intelligent temperature measuring device for an inflatable cabinet in an embodiment of the present invention; Figure 3is a schematic diagram of a partially enlarged structure of a conductive interface in an embodiment of the present invention; Figure 4 It is a schematic diagram of a partially enlarged structure of an ST coupler in an embodiment of the present invention; Figure 5 It is a schematic diagram of a partially enlarged structure of a temperature sensing probe in an embodiment of the present invention; Among them, 1 is a temperature sensor, 2 is a conducting optical fiber, 3 is a conducting interface, 4 is a receiving interface, 5 is an ST coupler, 6 is a raised conducting socket, 7 is a casting point, and 8 is a phase change material layer. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] In order to better understand the present invention, the terms in the present invention are explained below: Combining: Combining two or more fiber optic signals into a single fiber optic signal.

[0025] Integrated connection: a fixed connection that cannot be removed or separated.

[0026] See also Figure 1 as well as Figure 2 As shown, the intelligent temperature measuring device for an inflatable cabinet provided by the present invention comprises: The sensing part includes a temperature sensing probe 1, a transmission optical fiber 2 and a transmission interface 3; Wherein, the temperature sensing probe 1 is used to obtain the internal temperature of the inflatable cabinet to be tested; The transmission optical fiber 2 is used to transmit the internal temperature in the form of an optical signal; The sensing part is used to obtain the internal temperature of the inflatable cabinet to be tested, and transmit the internal temperature to the transmission interface 3 via the transmission optical fiber 2 as an optical signal; The transmission part is connected to the induction part and includes an ST coupler 5 and a receiving interface 4; The transmission part is used to receive one or more optical signals in the transmission optical fiber and combine them to form a single output signal; In a specific embodiment, the transmission optical fiber 2 has a length of 3 m to 50 m, a bending radius of not less than 4.4 cm, and a diameter of 2 mm.

[0027] It is understandable that the length of the transmission optical fiber 2 can be set accordingly according to the size of the actual application site.

[0028] In detail, the temperature sensor is a fluorescent material doped with rare earth ions. When excited by light of a specific wavelength, it will transition from the ground state to the excited state, and then return to the ground state by radiation transition, emitting characteristic fluorescence. As the temperature rises, the distribution of the number of ground and excited state particles of rare earth ions changes, resulting in changes in parameters such as fluorescence spectrum intensity, fluorescence peak position, and fluorescence lifetime. By establishing a calibration relationship between fluorescence parameters and temperature, accurate temperature measurement can be achieved. It can be used to obtain the accurate temperature of the cone socket in the gas cabinet to be tested.

[0029] Furthermore, the above-mentioned ST coupler is widely used in local area networks, wide area networks, optical fiber communication systems and data centers, is suitable for multi-mode optical fiber and single-mode optical fiber connection, and supports high-speed data transmission.

[0030] Furthermore, the transmission optical fiber adopts multimode optical fiber and utilizes a larger core diameter to allow optical signals to be incident at various angles and simultaneously transmit optical signals of various propagation modes (ie, various different paths or phases), thereby realizing the transmission of optical signals.

[0031] In the above steps, the intelligent temperature measuring device for the inflatable cabinet provided in this embodiment can monitor the internal temperature of the inflatable cabinet in real time and accurately by integrating a high-precision temperature measuring device. Through the integrated temperature sensing probe and transmission optical fiber, and the efficient optical signal transmission method, the device can accurately and real-time obtain and transmit the internal temperature of the inflatable cabinet. The setting of the phase change material layer further protects the temperature sensing probe from being damaged by high temperature, thereby ensuring the accuracy and reliability of temperature measurement.

[0032] Furthermore, when the internal temperature of the phase change material layer exceeds the threshold temperature, it can absorb heat and melt, thereby reducing the temperature of the temperature sensor and preventing it from being damaged by high temperature. When the temperature drops below the threshold, the phase change material can solidify again and continue to provide protection for the temperature sensor. This mechanism enables the device to operate stably for a long time in a high temperature environment, improves its high temperature resistance, and thus ensures the accuracy and reliability of temperature measurement.

[0033] Furthermore, by protecting the temperature sensing probe from high temperature damage, the phase change material layer helps to extend the service life of the entire temperature measuring device, which reduces the cost of replacement and maintenance and improves the economy and practicality of the equipment.

[0034] Furthermore, the transmission interface and the receiving interface are connected by threaded engagement, making the installation and removal process easier. This connection method also provides good sealing performance, preventing external factors such as dust and moisture from affecting the device, and further improving the reliability and stability of the device.

[0035] The transmission interface and the receiving interface are connected by threads.

[0036] Specifically, the transmission interface and the receiving interface are connected by threaded engagement, specifically: The inner surface of the conduction interface is provided with threaded teeth; The outer surface of the receiving interface is provided with a threaded opening; The diameter of the conducting interface is larger than the diameter of the receiving interface.

[0037] In a specific embodiment, the inner surface of the transmission interface is designed with threaded teeth, which are distributed in a spiral shape to provide a firm mechanical connection; at the same time, the outer surface of the receiving interface is also provided with matching threaded teeth accordingly. During the connection process, since the diameter of the transmission interface is slightly larger than the diameter of the receiving interface, the receiving interface can be easily screwed into the transmission interface until the threaded teeth of the two are tightly engaged to form a stable and reliable connection. This threaded connection method not only ensures a tight connection between the transmission interface and the receiving interface, but also provides good sealing performance to prevent external factors from affecting the inside of the device.

[0038] Furthermore, one end of the sensing part is a temperature sensing probe, and the other end is a conduction interface, specifically: The temperature sensing probe is integratedly connected to the transmission optical fiber, and the transmission optical fiber is integratedly connected to the transmission interface to form a sensing part.

[0039] In implementation, all components of the above-mentioned sensing part adopt integrated connection to reduce the risk of failure caused by poor connection or loose interface, which helps to maintain the stability and consistency of the optical signal, thereby improving the accuracy of temperature measurement. At the same time, the integrated connection simplifies the installation process of the system, reduces the installation steps and the time required, and also facilitates maintenance and inspection, reducing the maintenance cost and difficulty.

[0040] See also Figure 3 As shown, the conduction interface 3 is a hollow structure, and a protruding conduction socket 6 is provided at the inner center of the conduction interface 3 .

[0041] In a specific embodiment, the conducting interface 3 of the optical fiber temperature sensor is firmly connected to the receiving interface by threaded engagement. The raised conducting socket 6 designed inside the conducting interface is automatically aligned and inserted into the corresponding slot of the receiving interface after connection, thereby ensuring that the internal temperature information of the gas cabinet, that is, the optical signal efficiently and stably transmitted in the conducting optical fiber, can be accurately transmitted to the receiving interface, thereby realizing the collection and processing of the internal temperature data of the gas cabinet.

[0042] As the preferred technical solution for the intelligent temperature measuring device for the inflatable cabinet, the conducting interface, the receiving interface and the raised conducting socket are all made of copper.

[0043] As the preferred technical solution for the intelligent temperature measuring device for the inflatable cabinet, copper material is selected to form the conduction interface, the receiving interface and the raised conduction socket, mainly due to the excellent conductivity, corrosion resistance, thermal stability, high strength and wear resistance of copper. These characteristics ensure the low loss and stability of the signal during transmission, and improve the accuracy and reliability of the temperature measuring device. At the same time, copper material is easy to process and connect, and is convenient for customization and installation according to actual needs, thereby ensuring the efficient, stable and reliable operation of the temperature measuring device in the complex environment inside the inflatable cabinet.

[0044] Furthermore, the transmission optical fiber is composed of a transmission fiber core and a protective layer, specifically: The protective layer is coated on the outer surface of the conductive fiber core. The material of the protective layer is polytetrafluoroethylene and the thickness is 2 mm.

[0045] In a specific embodiment, the optical fiber protective cover is made of polytetrafluoroethylene material, which can be used for a long time at -180 to 260°C. This material has the characteristics of acid and alkali resistance, resistance to various organic solvents, and high temperature resistance. The optical fiber protective cover is made of 2mm polytetrafluoroethylene material, which is more suitable for cable joint casting.

[0046] The ST coupler has two grooves with the same depth symmetrically arranged.

[0047] The groove design allows the ST coupler to provide more precise positioning when connecting to other devices or fiber connectors, ensuring that the coupler can be accurately aligned and inserted into the corresponding slot or interface, thus avoiding signal transmission problems caused by misalignment.

[0048] See also Figure 4 As shown, two casting points are symmetrically arranged at the same level on the outer surface of the ST coupler; The two pourings are symmetrically arranged, and any pouring point is equidistant from the groove horizontally.

[0049] In a specific embodiment, the intelligent temperature measuring device for the inflatable cabinet of the present invention is embedded in the product when the plug is poured, and is completely embedded with the plug, without changing the original form of the plug and the cable head, and without reducing the performance of the cable head and the entire cabinet; the plug and the entire machine pre-installed with the intelligent temperature measuring device for the inflatable cabinet can normally pass the partial discharge test and the pressure resistance test. Preferably, the tensile strength of the pouring point should be 40 to 100N.

[0050] See also Figure 5 As shown, the temperature sensing probe 1 is also coated with a phase change material layer 8, specifically: When the internal temperature is greater than the threshold temperature, the phase change material in the phase change material layer 8 absorbs heat and melts from a solid state to a liquid state, so that the sensing temperature of the temperature sensing probe 1 is not greater than the threshold temperature.

[0051] When the internal temperature decreases from a temperature greater than a threshold temperature to a temperature less than a threshold temperature, the phase change material in the phase change material layer 9 gradually cools and solidifies from a liquid state to a solid state; The physical state of the phase change material in the phase change material layer 8 is only determined by the internal temperature, and the phase change material can be transformed from liquid to solid and from solid to liquid any number of times.

[0052] It is understandable that the threshold temperature can be arbitrarily set according to the applicable temperature measurement range of the temperature sensing probe 1. For example, the temperature measurement range of the temperature sensing probe 1 is -40°C to 260°C, and the corresponding threshold temperature is set to 300°C.

[0053] In detail, phase change materials can absorb or release a large amount of heat at a specific temperature, releasing the stored energy through the phase change process to maintain temperature stability or transfer thermal energy.

[0054] In practice, the phase change material in the phase change material layer 8 may be a metal alloy, such as a ferrite and austenite phase change material, which will transform from ferrite to austenite when heated to about 300 degrees, or vice versa when cooled. It may also be a molten salt such as sodium nitrate (NaNO 3 ), the melting point of sodium nitrate is about 307℃, at this temperature, it changes from solid to liquid and absorbs a lot of heat.

[0055] During implementation, the present invention outputs the internal temperature of the inflatable cabinet as a digital signal through the sensing part and the transmission part, which can be used for personalized applications in the background, such as alarm, early warning notification, remote monitoring, etc., and the internal temperature information of the inflatable cabinet can also be connected to other systems.

[0056] The components involved in the embodiments described in the present application can be implemented by hardware or software. The components described can also be set in a system. For example, it can be described as: a temperature measurement system includes a temperature measurement unit and a transmission unit, wherein the names of these units do not constitute a limitation on the components themselves in some cases.

[0057] The flowchart and block diagram in the accompanying drawings illustrate the system architecture, functions and operations that may be implemented according to the system and method of various embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based device that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0058] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An intelligent temperature measuring device for an inflatable cabinet, characterized in that: include: The sensing part includes a temperature sensing probe, a transmission optical fiber and a transmission interface; Wherein, the temperature sensing probe is used to obtain the internal temperature of the inflatable cabinet to be tested; The transmission optical fiber is used to transmit the internal temperature in the form of an optical signal; The sensing part is used to obtain the internal temperature of the inflatable cabinet to be tested, and transmit the internal temperature to the conductive interface by means of an optical signal through the conductive optical fiber; The transmission part is connected to the induction part and includes an ST coupler and a receiving interface; The transmission unit is used to receive one or more optical signals in the transmission optical fiber and combine them to form a single output signal; The transmission interface is connected to the receiving interface via threads.

2. The intelligent temperature measuring device for an inflatable cabinet according to claim 1, characterized in that: The transmission interface is connected to the receiving interface by threaded engagement, specifically: The inner surface of the conductive interface is provided with a threaded opening; The outer surface of the receiving interface is provided with a threaded opening; The diameter of the transmission interface is larger than the diameter of the receiving interface.

3. The intelligent temperature measuring device for an inflatable cabinet according to claim 2, characterized in that: One end of the sensing part is the temperature sensing probe, and the other end is the conduction interface, specifically: The temperature sensing probe is integratedly connected to the conductive optical fiber, and the conductive optical fiber is integratedly connected to the conductive interface to form the sensing part.

4. The intelligent temperature measuring device for an inflatable cabinet according to claim 3, characterized in that: The conduction interface is a hollow structure, and a protruding conduction socket is arranged at the inner center of the conduction interface.

5. The intelligent temperature measuring device for an inflatable cabinet according to claim 4, characterized in that: The conducting interface, the receiving interface and the raised conducting socket are all made of copper.

6. The intelligent temperature measuring device for an inflatable cabinet according to claim 5, characterized in that: The transmission optical fiber is composed of a transmission fiber core and a protective layer, specifically: The protective layer is coated on the outer surface of the conductive fiber core. The material of the protective layer is polytetrafluoroethylene and the thickness is 2 mm.

7. The intelligent temperature measuring device for an inflatable cabinet according to claim 6, characterized in that: The ST coupler is symmetrically provided with a groove having the same depth.

8. The intelligent temperature measuring device for an inflatable cabinet according to claim 7, characterized in that: Two casting points are symmetrically arranged at the same level on the outer surface of the ST coupler; Wherein, the two castings are symmetrically arranged, and any casting point is equidistant from the groove horizontally.

9. The intelligent temperature measuring device for an inflatable cabinet according to claim 8, characterized in that: The temperature sensing probe is also coated with a phase change material layer, specifically: When the internal temperature is greater than a threshold temperature, the phase change material in the phase change material layer absorbs heat and melts from a solid state to a liquid state, so that the sensing temperature of the temperature sensing probe is not greater than the threshold temperature.

10. The intelligent temperature measuring device for an inflatable cabinet according to claim 9, characterized in that: When the internal temperature decreases from greater than the threshold temperature to less than the threshold temperature, the phase change material in the phase change material layer gradually cools and solidifies from a liquid state to a solid state; The physical state of the phase change material in the phase change material layer is only determined by the internal temperature, and the phase change material can be transformed from liquid to solid and from solid to liquid any number of times.

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