Solid-sealed polar pole, high-voltage pole switch and solid-sealed polar pole pouring method

Abstract

The invention relates to the technical field of switches, in particular to a solid-sealed polar pole, a high-voltage pole-mounted switch and a solid-sealed polar pole pouring method. The solid-sealed polar pole provided by the invention comprises an insulating shell and a vacuum arc-extinguishing chamber arranged in the insulating shell, and a fluorescent optical fiber temperature sensor is integrally poured in the solid-sealed polar pole. According to the high-voltage column switch, the fluorescent optical fiber temperature sensor is used for detecting the temperature in the high-voltage column switch in a high-voltage environment, the fluorescent optical fiber temperature sensor is poured in the insulating shell, the optical fiber has good insulativity, temperature signals are transmitted through optical signals, and electric signal transmission is not needed; the influence of electromagnetic interference and a high electric field can be avoided, so that the temperature condition in the switch on the high-voltage column can be effectively monitored.

Description

Technical Field

[0001] This invention relates to the technical field of switches, and in particular to a solid-sealed pole, a high-voltage pole-mounted switch, and a method for casting the solid-sealed pole. Background Technology

[0002] High-voltage pole-mounted switches are high-voltage electrical devices installed on outdoor utility poles, primarily used for controlling the connection and disconnection of circuits. They include pole-mounted disconnect switches, pole-mounted load switches, pole-mounted vacuum load switches, and pole-mounted SF6 load switches. These switches are compact, easy to operate, safe, and reliable, and are widely used in power systems. Pole-mounted disconnect switches isolate power sources, ensuring safe equipment maintenance, while pole-mounted load switches can connect and disconnect circuits under load, but must be used in conjunction with fuses to interrupt short-circuit current. Pole-mounted vacuum load switches and SF6 load switches utilize the high insulation and rapid arc-extinguishing capabilities of vacuum and SF6 gas, making them suitable for medium-voltage distribution systems. Pole-mounted circuit breakers possess even stronger arc-extinguishing capabilities and protective functions, quickly interrupting abnormal currents during faults. These switches are selected based on grid requirements, environmental conditions, and economic budgets, and are an important component of the power system.

[0003] The internal temperature of a high-voltage pole-mounted switch is a crucial indicator of the equipment's healthy operating status and is of great significance. In particular, the temperature near the high-voltage contact point is often accompanied by an increase in temperature in the early stages of a fault. By monitoring the temperature, we can not only monitor the operating status of the high-voltage pole-mounted switch but also predict equipment failures in advance and prevent accidents from occurring.

[0004] However, due to the excessively high voltage of the high-voltage pole-mounted switch, traditional temperature measurement methods cannot meet the requirements. For example, the thermocouple method cannot meet the insulation performance requirements under high-voltage conditions. Summary of the Invention

[0005] The purpose of this invention is to provide a solid-sealed pole, a high-voltage pole-mounted switch, and a method for casting the solid-sealed pole, which can provide timely feedback on the internal temperature of the high-voltage pole-mounted switch.

[0006] To solve the above-mentioned technical problems, the present invention provides a solid-sealed pole and a high-voltage pole-mounted switch.

[0007] The solid-sealed electrode of the present invention includes an insulating shell and a vacuum interrupter disposed within the insulating shell; a fluorescent fiber optic temperature sensor is integrally cast inside the solid-sealed electrode.

[0008] Furthermore, the vacuum interrupter includes a contact system, the fluorescent fiber optic temperature sensor is located near the contact system, and the insulating housing includes a main body and an outgoing wire section integrally formed with the main body. The insulating housing has a central cavity, and the distance between the fluorescent fiber optic temperature sensor and the central axis of the central cavity is a radius r.s The radius r s The scope is: Where, r y r is the outer radius of the insulating shell; i T is the inner radius of the insulating shell; i The temperature of the inner wall of the central cavity is given by T; L is the length of the solid-sealed electrode, and k is the thermal conductivity of the solid-sealed electrode; max This represents the upper limit of the fluorescent fiber optic temperature sensor's temperature range; ΔT max The maximum temperature difference allowed by the fluorescent fiber optic temperature sensor within the set accuracy range; Φ is the total heat passing through the cylinder wall of the solidified electrode per unit time; The empirical value is set to prevent partial discharge problems caused by the fluorescent fiber temperature sensor being too close to a heat source.

[0009] Furthermore, the insulating housing includes a main body and an outgoing cable section integrally formed with the main body. The insulating housing has a central cavity, and the outgoing cable section and the fluorescent fiber optic temperature sensor are respectively located on both sides of the central cavity so that the fluorescent fiber optic temperature sensor is away from the outgoing cable section.

[0010] Furthermore, the distance between the fluorescent fiber optic temperature sensor and the central axis of the central cavity is 60-80 mm, and the distance between the fluorescent fiber optic temperature sensor and the inner wall of the central cavity is 20-40 mm.

[0011] Furthermore, the fluorescent fiber optic temperature sensor includes an end temperature sensing probe, an optical fiber cable, and an optical fiber connector. Both ends of the optical fiber cable are connected to the end temperature sensing probe and the optical fiber connector, respectively. The end temperature sensing probe and the portion of the optical fiber cable connected to it are encapsulated within the insulating housing. The other portion of the optical fiber cable connected to the optical fiber connector extends outside the insulating housing. The optical fiber connector is used to connect to an external photoelectric conversion module. The portion of the optical fiber cable connected to the end temperature sensing probe is doped with fluorescent material.

[0012] Furthermore, the optical fiber cable includes an optical fiber body, a cladding, and a coating layer arranged sequentially from the inside out. The refractive index of the cladding is lower than that of the optical fiber body, and the coating layer is used to protect the optical fiber body.

[0013] Furthermore, the length of the end temperature sensor is 0.5-2 cm and the diameter is 1-3 mm.

[0014] Furthermore, the insulating outer shell is umbrella-shaped and is cast from epoxy resin.

[0015] The present invention also provides a high-voltage pole-mounted switch, including an operating mechanism and a solid-sealed pole as described in any of the above technical solutions.

[0016] The present invention also provides a method for casting a solidified electrode column, used for casting a solidified electrode column as described in any of the above technical solutions, comprising: Preheat the mold, conductive components, vacuum interrupter, and fiber optic temperature sensor, and keep them at a constant temperature. The conductive component, the vacuum interrupter, and the fiber optic temperature sensor are fixed inside the mold. The insulating material is injected into the mold at a first set pressure; The insulating material is cured at a set temperature and a second set pressure to form a solidified electrode post; The mold is removed and the solidified electrode is repaired and inspected for quality.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: In this invention, the fluorescent fiber optic temperature sensor is used to detect the temperature inside the high-voltage pole-mounted switch under high-voltage conditions. Since the fluorescent fiber optic temperature sensor is cast in an insulating shell and the fiber has good insulation properties, it uses optical signals to transmit temperature signals and does not require electrical signal transmission, thus avoiding electromagnetic interference and the influence of high electric fields. Therefore, it can effectively monitor the temperature inside the high-voltage pole-mounted switch. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a structure of an embodiment of the high-voltage pole-mounted switch of the present invention; Figure 2 for Figure 1 A schematic diagram of a fluorescent fiber optic temperature sensor with an opening on a high-pressure column. Figure 3 This is a schematic flowchart of the solid-sealing pole casting method of the present invention.

[0019] 1. Insulating housing; 11. Main body; 12. Outgoing cable section; 13. Central cavity; 2. Vacuum interrupter; 3. Fluorescent fiber optic temperature sensor; 31. End-effector temperature sensor; 32. Optical fiber cable; 33. Coating layer; 34. Optical fiber connector; 4. Current sensor; 5. Ceramic capacitive voltage divider sensor; 6. Incoming conductor rod; 7. Outgoing conductor rod. Detailed Implementation

[0020] The solid-sealed pole and high-voltage pole-mounted switch of the present invention will now be described with reference to schematic diagrams, which illustrate preferred embodiments of the invention. It should be understood that those skilled in the art can modify the invention described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the invention.

[0021] The serial numbers assigned to components in this document, such as "first," "second," etc., are merely used to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0023] The invention is described more specifically by way of example in the following paragraphs with reference to the accompanying drawings. The advantages and features of the invention will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the invention.

[0024] The following is in conjunction with the instruction manual appendix. Figure 1 and attached Figure 2 The solid-sealed pole and high-voltage pole-mounted switch of the present invention will be described.

[0025] In one embodiment, the high-voltage pole-mounted switch of this embodiment includes an operating mechanism and a solid-sealed pole.

[0026] The operating mechanism is used to control the closing and opening operations of the switch, thereby controlling the on / off state of the circuit to meet the system's power supply, power outage, and fault handling requirements.

[0027] like Figure 1 As shown, the solid-sealed pole includes an insulating shell 1 and a vacuum interrupter 2 disposed within the insulating shell 1; a fluorescent fiber optic temperature sensor 3 is integrally cast inside the solid-sealed pole. The fluorescent fiber optic temperature sensor 3 is used to detect the temperature inside the high-voltage pole-mounted switch under high-voltage conditions. Because the fluorescent fiber optic temperature sensor 3 is cast inside the insulating shell 1, and the optical fiber has good insulation properties, it uses optical signals to transmit temperature signals, eliminating the need for electrical signal transmission and avoiding electromagnetic interference and the influence of high electric fields. This allows for effective monitoring of the temperature inside the high-voltage pole-mounted switch. To improve the accuracy of temperature monitoring, in one embodiment, the vacuum interrupter 2 includes a contact system, and the fluorescent fiber optic temperature sensor 3 is located near the contact system. For example, it is positioned near the junction of the moving and stationary contacts of the contact system.

[0028] like Figure 1 As shown, the high-voltage pole-mounted switch also includes a current sensor 4, a ceramic capacitive voltage divider sensor 5, an inlet conductive rod 6, and an outlet conductive rod 7.

[0029] In one embodiment, the insulating housing 1 includes a main body 11 and an outgoing cable section 12 integrally formed with the main body. The insulating housing 1 has a central cavity 13. The outgoing cable section 12 and the fluorescent fiber optic temperature sensor 3 are respectively located on both sides of the central cavity 13 so that the fluorescent fiber optic temperature sensor 3 is away from the outgoing cable section 12.

[0030] The lead-out section 12 is used to lead out the lead-out conductive rod 7, which carries high current or high voltage and generates electromagnetic fields or heat. Placing the fluorescent fiber optic temperature sensor 3 on the other side of the central cavity 13 physically isolates it from the lead-out conductive rod 7, reducing electromagnetic interference and thermal cross-contamination. This makes it easier for the fluorescent fiber optic temperature sensor 3 to detect the true contact system temperature, rather than being distorted by stray heat dissipation or electric field distortion from the lead-out section, thus improving temperature sensitivity and enabling the fluorescent fiber optic temperature sensor to respond more quickly to temperature changes.

[0031] Furthermore, the integrated casting process ensures the fixation and insulation of the fluorescent fiber temperature sensor 3, allowing it to be more stably embedded in the insulating housing 1. Placing the fluorescent fiber temperature sensor 3 and the lead-out section 12 on opposite sides facilitates the uniformity of the casting process, reduces air bubbles or stress concentration, thereby improving the working reliability of the fluorescent fiber temperature sensor 3 and further enhancing the temperature measurement accuracy.

[0032] Furthermore, in some embodiments, the distance between the fluorescent fiber temperature sensor 3 and the central axis of the central cavity 13 is 60-80 mm, and the distance between the fluorescent fiber temperature sensor 3 and the inner wall surface of the central cavity 13 is 20-40 mm.

[0033] Preferably, the distance between the fluorescent fiber optic temperature sensor 3 and the central axis of the central cavity 13 is 70 mm. In other embodiments, it can be 60 mm, 65 mm, 75 mm, or 80 mm. The 30 mm distance between the fluorescent fiber optic temperature sensor 3 and the inner wall of the central cavity 13 can be 20 mm, 25 mm, 35 mm, or 40 mm in other embodiments.

[0034] The contact system is the main heat-generating area and is arranged in the central cavity 13. The distance (60-80 mm) between the fluorescent fiber temperature sensor 3 and the central axis enables the fluorescent fiber temperature sensor 3 to be within the effective thermal radiation range of the contact system, thereby enabling it to respond quickly to temperature changes and improve temperature measurement sensitivity and accuracy.

[0035] The distance (20-40 mm) between the fluorescent fiber optic temperature sensor 3 and the inner wall of the central cavity 13 prevents the sensor from being too close to the outer wall of the insulating housing 1. If the fluorescent fiber optic temperature sensor 3 is too close to the inner wall, it may be affected by the external ambient temperature or the temperature difference of the housing, leading to measurement deviation. This distance ensures that the sensor mainly monitors the temperature of the internal heat source, rather than external interference, thereby improving accuracy.

[0036] The optimal location for the fluorescent fiber optic temperature sensor 3 can be calculated using the heat conduction formula. Specifically: The core integral expression for heat conduction is based on Fourier's law, describing the relationship between the heat flow through a given area and the temperature gradient. Its vector form is: (1); The integral form is used to calculate the total heat flow Φ through a specific area A, and its expression is: (2); Where Φ is the total heat flow (unit: W), representing the heat passing through area A per unit time; q is the heat flux density vector (unit: W / m³). 2 ( ), describes the intensity and direction of heat transfer at a point; k is the thermal conductivity of the material (unit: W / (m·K)), a physical quantity that measures the thermal conductivity of a material. The larger the value, the stronger the thermal conductivity. ∇T: Temperature gradient vector (unit: K / m), representing the rate of change of temperature in space, pointing in the direction of the fastest temperature increase; dA: Infinite element area vector (unit: m) 2 ), and its direction is consistent with the normal direction of the area element.

[0037] For steady-state heat conduction in a single-layer cylindrical wall (such as an insulating shell), neglecting axial and circumferential heat conduction (only radial heat transfer), the integral result of its total heat flow Φ is: (3) Where Φ is the total heat flow (unit: W), which is the heat passing through the cylinder wall per unit time; L is the length of the cylindrical wall (unit: m), which is the dimension along the axial direction; k is the thermal conductivity of the cylindrical wall material (unit: W / (m·K)); ΔT is the temperature difference between the inner and outer surfaces of the cylindrical wall (unit: K). ( The inner wall temperature The outer wall temperature, ); The inner radius of the cylindrical wall (unit: m) corresponds to the inner wall surface; Let be the outer radius of the cylindrical wall (unit: m), corresponding to the outer wall surface, and .

[0038] When applying the above formula to the solid-sealed terminal block of this application, it is assumed that the inner radius of the insulating shell of the solid-sealed terminal block is r. i The outer radius is r y The temperature of the inner wall of the central cavity is T. i The outer wall temperature of the insulating shell is T. y The length of the solid-sealed electrode is L, the thermal conductivity of the solid-sealed electrode is k, and the fluorescent fiber optic temperature sensor is located at a radius r. s At this point, according to the above formula (3), the total heat passing through the cylinder wall of the solidified electrode per unit time is: .

[0039] From the heat conduction formula of a single-layer cylindrical wall, the radial temperature distribution can be seen. for: (4) Fluorescent fiber optic temperature sensor at radius r s Temperature T s for: (5) Define the temperature difference of the fluorescent fiber optic temperature sensor To improve the accuracy of the fluorescent fiber optic temperature sensor, the maximum allowable temperature difference is set to ΔT. max ,but: (6) Solving for: (7) Because the fluorescent fiber optic temperature sensor is cast inside a solid-sealed electrode, it cannot extend beyond the outer radius r of the central cavity. y , This gives r s The upper limit of the fluorescence fiber optic temperature sensor ensures high accuracy while preventing it from moving too far from the heat source or exceeding the outer radius r of the central cavity. y .

[0040] Since the fluorescent fiber optic temperature sensor has a maximum temperature limit, let it be T. max Therefore, T needs to be made s ≤T max : (8) Solving for: (9) This gives r s The lower limit is set to ensure that the fluorescent fiber optic temperature sensor does not get too close to the heat source, thus protecting the fluorescent fiber optic temperature sensor.

[0041] Furthermore, since placing the fluorescent fiber optic temperature sensor too close to a heat source can cause partial discharge problems, it is necessary to set empirical values ​​based on experience. , make r s Not less than Combining formula (9), we can see that r s The lower limit should be and One of the larger ones.

[0042] In summary, the radius r of the fluorescent fiber optic temperature sensor is... s The scope should be: (10) In one embodiment, such as Figure 1 and Figure 2As shown, the fluorescent fiber optic temperature sensor 3 includes an end temperature sensing probe 31, an optical fiber cable 32, and an optical fiber connector 34. Both ends of the optical fiber cable 32 are connected to the end temperature sensing probe 31 and the optical fiber connector 34, respectively. The end temperature sensing probe 31 and the portion of the optical fiber cable 32 connected to it are encapsulated inside the insulating housing 1. The other portion of the optical fiber cable 32 connected to the optical fiber connector 34 extends outside the insulating housing 1. The optical fiber connector 34 is used to connect to an external photoelectric conversion module. The portion of the optical fiber cable 32 connected to the end temperature sensing probe 31 is doped with fluorescent material.

[0043] The fluorescent material is typically a substance that can generate a fluorescent signal under the irradiation of excitation light, such as dysprosium ions (Dy3+) or holmium ions (Ho3+). These fluorescent materials have specific luminescence and absorption characteristics. When the end temperature sensing probe 31 of the fluorescent fiber temperature sensor 3 is exposed to the environment of the measured temperature, the fluorescent material absorbs the heat energy in the environment, and the energy level inside the molecule changes. This change in energy level will cause the emission wavelength and intensity of the fluorescent material to change.

[0044] When fluorescent materials absorb excitation light of a specific wavelength, they emit fluorescence signals of a specific wavelength within the spectral range. As the temperature of the optical fiber changes, the emission wavelength and intensity of the fluorescence signal also change. By analyzing the emission wavelength and intensity of the fluorescence signal and their changes using a spectrometer, the temperature information of the optical fiber can be deduced.

[0045] The end temperature sensing probe 31 located inside the insulating housing 1 and the optical fiber cable 32 with fluorescent material can sense the temperature change inside the insulating housing 1. The emission wavelength and intensity of the fluorescent material change. When external excitation light shines on the position of the fluorescent material, the generated fluorescence signal corresponding to the current temperature will be transmitted to the photoelectric conversion module along the optical fiber cable. The photoelectric conversion module receives and analyzes the fluorescence signal containing the temperature signal.

[0046] In one embodiment, the optical fiber cable 32 includes an optical fiber body, a cladding, and a coating layer 33 arranged sequentially from the inside out. The refractive index of the cladding is lower than that of the optical fiber body, and the coating layer 33 is used to protect the optical fiber body so that it is not easily damaged.

[0047] Preferably, the cladding is a layer of glass or other transparent material covering the optical fiber body, with a refractive index lower than that of the optical fiber body, thereby confining the optical signal to propagate within the optical fiber body. The coating layer 33 is a silicone fluororubber protective sleeve, used to protect the surface of the optical fiber body from the effects of moisture and external abrasion, while improving the micro-bending resistance of the optical fiber body and reducing the micro-bending-related losses. In other embodiments, the coating layer 33 may also be made of acrylate and nylon materials.

[0048] In one embodiment, the fiber optic connector 34 is an ST (Straight Tip) connector. ST connectors provide a tight connection, are not easily detached, and are relatively simple and convenient to operate, offering high reliability. In other embodiments, the fiber optic connector 34 can also be an FC (Ferrule Connector) or an SC (Subscriber Connector).

[0049] The diameter of the optical fiber cable 32 is 2-4 mm. In this embodiment, the diameter of the optical fiber cable 32 is preferably 3 mm. In other embodiments, the diameter of the optical fiber cable 32 can also be 2 mm or 4 mm.

[0050] The end-effector temperature probe 31 has a length of 0.5-2 cm and a diameter of 1-3 mm. In this embodiment, the length of the end-effector temperature probe 31 is preferably 1 cm and the diameter is preferably 1.7 mm.

[0051] In one embodiment, the insulating shell is umbrella-shaped and is cast from epoxy resin. The umbrella-shaped design increases the creepage distance and improves insulation capability. Combined with the insulating properties of epoxy resin, it can significantly improve the insulation capability of high-voltage pole-mounted switches.

[0052] The present invention also provides a solid-sealed terminal block, the structure of which is the same as that of the solid-sealed terminal block of the high-voltage pole-mounted switch in the above embodiments, and will not be described again here.

[0053] This invention also provides a method for casting a solidified electrode column, used for casting a solidified electrode column as described in any of the above technical solutions, such as... Figure 3 As shown, it includes: S100: Preheats and insulates the mold, conductive components, vacuum interrupter, and fiber optic temperature sensor; S200: Fix the conductive component, the vacuum interrupter, and the fiber optic temperature sensor inside the mold; S300: Inject the insulating material into the mold at a first set pressure; S400: The insulating material is cured at a set temperature and a second set pressure to form a solid-sealed pole; S500: Remove the mold and repair and inspect the quality of the solidified pole.

[0054] In the preparation stage before pouring, clean the mold of the column switch to ensure that there are no foreign objects inside; check the quality and performance of the raw materials, and mix the epoxy resin pouring material in proportion.

[0055] In step S100, the mold, conductive components, vacuum interrupter, and fiber optic temperature sensor are preheated and kept at a constant temperature to ensure that the interior of the mold, the conductive components, the vacuum interrupter, and the surface of the fiber optic temperature sensor are dry, so that their temperature is close to that of the insulating material, thereby avoiding defects such as cracks and pores inside the solidified pole after casting.

[0056] In step S200, the conductive components, the vacuum interrupter, and the fiber optic temperature sensor are accurately and firmly fixed inside the mold according to the design requirements, using the support and connection structure.

[0057] In step S300, the prepared insulating casting material is slowly injected into the mold at the first set pressure and speed required by the process to avoid air bubbles and uneven casting; the mold's vent holes and channels are kept clear to remove air bubbles. The insulating material can be epoxy resin or other suitable insulating materials. The first set pressure is the injection pressure, which can be 0.1-0.5 MPa, preferably 0.3-0.4 MPa. For example, it can be 0.3 MPa or 0.4 MPa. Too low a pressure will result in incomplete filling, while too high a pressure may damage the sensor positioning or generate internal stress. The casting speed is a filling time of 3-15 minutes, preferably 5-8 minutes. For example, it can be 5 minutes, 6 minutes, or 8 minutes. Too fast a speed will easily trap air bubbles, while too slow a speed will cause local pre-curing of the material.

[0058] In step S400, the insulating material is cured under a set temperature and a second set pressure. The curing process needs to be monitored to avoid external interference. The second set pressure can be 0.3-0.5 MPa, preferably 0.35-0.45 MPa, for example, 0.35 MPa or 0.45 MPa. This second set pressure is the holding pressure; a suitable holding pressure can compensate for curing shrinkage and prevent porosity. The holding pressure needs to be higher than the injection pressure to maintain density. The set temperature is the curing temperature, which can be 130-160℃, preferably 140-150℃, for example, 140℃, 145℃, or 150℃. Too low a curing temperature will prolong the curing cycle, while too high a temperature will accelerate the reaction and cause cracking; therefore, the epoxy resin needs to be within its optimal curing activity range.

[0059] In step S500, after curing is completed, the mold is removed, and the surface of the sealed electrode post is trimmed, polished, and subjected to quality inspection, such as visual inspection and insulation performance testing. Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A solid-sealed electrode post, characterized in that, It includes an insulating housing and a vacuum interrupter chamber disposed within the insulating housing; a fluorescent fiber optic temperature sensor is integrally cast inside the solid-sealed pole.

2. The solid-sealed electrode post according to claim 1, characterized in that, The vacuum interrupter includes a contact system, and the fluorescent fiber optic temperature sensor is located near the contact system. The insulating housing includes a main body and an outgoing wire section integrally formed with the main body. The insulating housing has a central cavity, and the distance between the fluorescent fiber optic temperature sensor and the central axis of the central cavity is a radius r. s The radius r s The scope is: ； Where, r y r is the outer radius of the insulating shell; i T is the inner radius of the insulating shell; i The temperature of the inner wall of the central cavity is given by T; L is the length of the solid-sealed electrode, and k is the thermal conductivity of the solid-sealed electrode; max This represents the upper limit of the fluorescent fiber optic temperature sensor's temperature range; ΔT max The maximum temperature difference allowed by the fluorescent fiber optic temperature sensor within the set accuracy range; Φ is the total heat passing through the cylinder wall of the solidified electrode per unit time; The empirical value is set to prevent partial discharge problems caused by the fluorescent fiber temperature sensor being too close to a heat source.

3. The solid-sealed electrode post according to claim 1, characterized in that, The insulating housing includes a main body and an outgoing cable section integrally formed with the main body. The insulating housing has a central cavity, and the outgoing cable section and the fluorescent fiber optic temperature sensor are respectively located on both sides of the central cavity so that the fluorescent fiber optic temperature sensor is away from the outgoing cable section.

4. The solid-sealed electrode post according to claim 3, characterized in that, The distance between the fluorescent fiber optic temperature sensor and the central axis of the central cavity is 60-80 mm, and the distance between the fluorescent fiber optic temperature sensor and the inner wall of the central cavity is 20-40 mm.

5. The solid-sealed electrode post according to claim 1, characterized in that, The fluorescent fiber optic temperature sensor includes an end-sensing probe, an optical fiber cable, and an optical fiber connector. Both ends of the optical fiber cable are connected to the end-sensing probe and the optical fiber connector, respectively. The end-sensing probe and the portion of the optical fiber cable connected to it are encapsulated within the insulating housing. The other portion of the optical fiber cable connected to the optical fiber connector extends outside the insulating housing. The optical fiber connector is used to connect to an external photoelectric conversion module. The portion of the optical fiber cable connected to the end-sensing probe is doped with fluorescent material.

6. The solid-sealed electrode post according to claim 3, characterized in that, The optical fiber cable includes an optical fiber body, a cladding, and a coating layer arranged sequentially from the inside out. The refractive index of the cladding is lower than that of the optical fiber body, and the coating layer is used to protect the optical fiber body.

7. The solid-sealed electrode post according to claim 5, characterized in that, The end temperature sensor has a length of 0.5-2 cm and a diameter of 1-3 mm.

8. The solid-sealed electrode post according to claim 1, characterized in that, The insulating outer shell is umbrella-shaped and is made of epoxy resin.

9. A high-voltage pole-mounted switch, characterized in that, It includes an operating mechanism and a solid-sealed pole as described in any one of claims 1-8.

10. A method for casting a solid-sealing pole, characterized in that, For casting the solidified pole as described in any one of claims 1 to 8, comprising: Preheat the mold, conductive components, vacuum interrupter, and fiber optic temperature sensor, and keep them at a constant temperature. The conductive component, the vacuum interrupter, and the fiber optic temperature sensor are fixed inside the mold. The insulating material is injected into the mold at a first set pressure; The insulating material is cured at a set temperature and a second set pressure to form a solidified electrode post; The mold is removed and the solidified electrode post is repaired and inspected for quality.

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