Circulating cooling high-voltage wall bushing for solid electric heat storage

Abstract

The invention relates to the technical field of heat storage electric boilers for oil and gas field development, in particular to a circulating cooling high-pressure wall bushing for solid electric heat storage. A 110KV incoming line is arranged in the wall bushing, the wall bushing penetrates through a heat storage wall and is connected with the heat storage wall, a cooling cover is mounted on the heat storage wall, the wall bushing is inserted into the cooling cover, the cooling cover is communicated with a pipeline, heat exchange tubes are arranged in the cooling cover, a heat insulation layer is mounted on the outer side of the cooling cover, and an insulating baffle is mounted on the cooling cover. A conductor is installed at the tail end of the wall bushing, the conductor is connected with a wiring board, the wiring board penetrates out of the insulating baffle and is connected with a heat accumulator through a heating wire, the pipeline is communicated with cooling equipment, a circulating pump and a cooling fan are arranged in the cooling equipment, the cooling fan is communicated with the circulating pump, and the cooling fan and the circulating pump are both communicated with the pipeline. According to the high-voltage wall bushing provided by the invention, a heat source is effectively isolated, and the wall bushing stably runs within a reasonable temperature through a circulating cooling mode.

Description

Technical Field

[0001] The present invention relates to the technical field of electric storage thermal boilers for oil and gas field development, and particularly to a circulating cooling high-voltage through-wall bushing for solid electric heat storage. Background Art

[0002] In recent years, petrochemical enterprises have developed rapidly in using solid electric heat storage devices for various heating processes in the exploitation and refining. The solid electric heat storage device can save the high-voltage transformation part in the construction of the station by adopting the high-voltage direct input method, with simple switching and cost savings at the same time. High-voltage direct input requires a high-voltage through-wall bushing to introduce the power supply through the wall of the heat storage device into the heat storage body. During operation, the heat of the heat storage body will be transmitted to the through-wall bushing, affecting its performance.

[0003] Currently, the direct input technology below 35 kV is relatively mature, and the performance of the high-voltage through-wall bushing at high temperatures can meet the requirements. Most of the 110 kV through-wall bushings are of composite insulation form and cannot maintain insulation and sealing performance in an environment above 100 °C. For this reason, a circulating cooling high-voltage through-wall bushing for solid electric heat storage is proposed. Summary of the Invention

[0004] (I) Technical Problems to be Solved The present invention provides a circulating cooling high-voltage through-wall bushing for solid electric heat storage, mainly solving the problem that the 110 kV through-wall bushing in the prior art cannot maintain insulation and sealing performance in an environment above 100 °C.

[0005] (II) Technical Solutions To solve the above problems, the present invention provides a circulating cooling high-voltage through-wall bushing for solid electric heat storage, including: A through-wall bushing, the inside of the through-wall bushing is a 110 kV incoming line, the through-wall bushing passes through the heat storage wall, the through-wall bushing is connected to the heat storage wall, a cooling cover is installed on the other side of the heat storage wall, the rear half section of the through-wall bushing is inserted into the cooling cover, one end of the cooling cover is connected to a pipeline, heat exchange tubes are arranged inside the cooling cover, a heat insulation and thermal insulation layer is installed on the outside of the cooling cover, an insulating baffle is installed at the other end of the cooling cover, a conductor is installed at the tail end of the through-wall bushing, the conductor is connected to a wiring board, the tail end of the wiring board passes through the insulating baffle, the tail end of the wiring board is connected to a heating wire, the other end of the heating wire is connected to a heat storage body, the other end of the pipeline is connected to a cooling device, a circulating pump and a cooling fan are provided inside the cooling device, the cooling fan is connected to the circulating pump, and both the cooling fan and the circulating pump are connected to the pipeline; The wall bushing is a silicone rubber bushing with a rated voltage of 126 kV. The interior of the wall bushing is filled with SF6 gas, and the wall bushing isolates the external environment through the SF6 gas. The cooling cover reduces the heat dissipation to the external environment through the heat insulation layer. A coolant circulation channel is provided inside the cooling cover, and coolant flows through the coolant channel. The cooling cover maintains electrical safety through an insulating baffle. The circulation pump drives the coolant to circulate between the cooling cover and the cooling equipment. The cooling fan dissipates heat to the surrounding environment through forced convection. The pipeline is a flow channel for the coolant between the cooling equipment and the cooling cover. A temperature sensor is provided inside the cooling cover, and the cooling cover monitors the internal temperature of the cooling cover in real time through the temperature sensor.

[0006] Preferably, the temperature tolerance range of the silicone rubber of the wall bushing is -50°C - 160°C, and the annual leakage rate of the SF6 gas does not exceed 0.5%.

[0007] Preferably, a plurality of bushing fixing flanges are installed on the outer side of the wall bushing, and a plurality of heat storage wall fixing flanges are embedded on the inner side of the heat storage wall. The number of the bushing fixing flanges is adapted to the number of the heat storage wall fixing flanges, and the bushing fixing flanges are connected to the heat storage wall fixing flanges.

[0008] Preferably, a plurality of cooling cover fixing flanges are embedded inside the other side of the heat storage wall. The heat storage wall fixes the cooling cover through the cooling cover fixing flanges and seals it through a gasket.

[0009] Preferably, the length of the wall bushing on the inner and outer sides of the heat storage wall is at least 1.4 meters, the length of the cooling cover is at least 1.5 meters, the distance from the end of the cooling cover to the heat storage body is at least 1.5 meters, the diameter of the cooling cover is at least 3 meters, and the distance from the cooling cover to the conductor is at least 1.5 meters.

[0010] Preferably, the cooling cover and the insulating baffle are sealed through a gasket. The material of the insulating baffle is epoxy resin or polytetrafluoroethylene. The insulation resistance of the insulating baffle is ≥ 100 megohms, and the mechanical strength of the insulating baffle is ≥ 10 kN impact force.

[0011] Preferably, the cooling equipment controls the internal temperature of the cooling cover to be maintained at 40 - 60°C. The temperature sensor presets a warning value. If the temperature sensor identifies that the internal temperature of the cooling cover exceeds the warning value, the temperature sensor will automatically send an alarm signal.

[0012] Preferably, the accuracy of the temperature sensor is at least ±0.5°C, and the range of the warning value is 70 - 80°C.

[0013] Preferably, the flow rate of the coolant is 0.5 - 2 m / s, the coolant is deionized water or a special coolant, the flow rate of the circulation pump is 5 - 20 m³ / h, and the air volume of the cooling fan is 1000 - 5000 m³ / h.

[0014] Preferably, the heat insulation layer is aluminosilicate fiber or aerogel, and the thermal conductivity of the heat insulation layer is 0.03 - 0.1 W / (m·K).

[0015] (III) Beneficial effects For the circulating cooling high-voltage wall bushing for solid electric heat storage provided by the present invention, the inside of the wall bushing is a 110 kV incoming line. The wall bushing adopts a silicone rubber bushing with a rated voltage of 126 kV to ensure safe operation in a high-voltage environment. The wall bushing is completely isolated from the external environment by filling SF6 gas, effectively preventing the influence of external factors such as moisture and dust on the inside of the bushing, thereby ensuring the insulation performance and stability of the bushing. A temperature sensor is set inside the cooling cover as a temperature measurement point, which can monitor the temperature inside the cooling cover in real time. The end face of the cooling cover adopts an insulating baffle to effectively prevent accidents such as electric leakage and short circuit. Through the circulating flow of the coolant, the heat generated by the wall bushing can be quickly removed, effectively solving the overheating problem faced by traditional wall bushings in the solid electric heat storage system. Description of the drawings

[0016] Figure 1 It is a schematic structural diagram of the circulating cooling high-voltage wall bushing for solid electric heat storage in the embodiment of the present invention.

[0017] 1. Wall bushing; 2. Cooling cover; 3. Cooling equipment; 4. Bushing fixing flange; 5. Heat storage wall fixing flange; 6. Heat insulation layer; 7. Heat exchange tube; 8. Pipeline; 9. Heat storage wall; 10. Insulating baffle; 11. Wiring board; 12. Circulation pump; 13. Cooling fan; 14. Conductor; 15. Heating wire; 16. Heat storage body. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Figure 1 It is a schematic structural diagram of the circulating cooling high-voltage wall bushing for solid electric heat storage in the embodiment of the present invention. As Figure 1 shown, the present invention provides a circulating cooling high-voltage wall bushing for solid electric heat storage, including: Wall-piercing bushing 1, the inside of the wall-piercing bushing 1 is a 110KV incoming line, the wall-piercing bushing 1 passes through the heat storage wall 9, the wall-piercing bushing 1 is connected to the heat storage wall 9, a cooling cover 2 is installed on the other side of the heat storage wall 9, the rear half of the wall-piercing bushing 1 is inserted into the cooling cover 2, one end of the cooling cover 2 is connected to a pipe 8, heat exchange tubes 7 are arranged inside the cooling cover 2, a heat insulation and thermal insulation layer 6 is installed outside the cooling cover 2, an insulating baffle 10 is installed at the other end of the cooling cover 2, a conductor 14 is installed at the tail end of the wall-piercing bushing 1, the conductor 14 is connected to a wiring board 11, the tail end of the wiring board 11 passes through the insulating baffle 10, the tail end of the wiring board 11 is connected to a heating wire 15, the other end of the heating wire 15 is connected to a heat storage body 16, the other end of the pipe 8 is connected to a cooling device 3, a circulation pump 12 and a cooling fan 13 are arranged inside the cooling device 3, the cooling fan 13 is connected to the circulation pump 12, and both the cooling fan 13 and the circulation pump 12 are connected to the pipe 8; The wall-piercing bushing 1 is a silicone rubber bushing with a rated voltage of 126kV. The inside of the wall-piercing bushing 1 is filled with SF6 gas. The wall-piercing bushing 1 isolates the external environment through SF6 gas. The cooling cover 2 reduces the heat dissipation to the external environment through the heat insulation and thermal insulation layer 6. A coolant circulation channel is arranged inside the cooling cover 2, and coolant flows in the coolant channel. The cooling cover 2 maintains electrical safety through the insulating baffle 10. The circulation pump 12 drives the coolant to circulate between the cooling cover 2 and the cooling device 3. The cooling fan 13 dissipates heat to the surrounding environment through forced convection. The pipe 8 is a flow channel for the coolant between the cooling device 3 and the cooling cover 2. A temperature sensor is arranged inside the cooling cover 2, and the cooling cover 2 monitors the internal temperature of the cooling cover in real time through the temperature sensor.

[0020] In practical applications, the wall-piercing bushing 1 uses a silicone rubber bushing with a rated voltage of 126kV to ensure safe operation in a high-voltage environment. Silicone rubber has good insulation performance and flexibility and can withstand the impact of high voltage. The inside of the wall-piercing bushing 1 is airtight and filled with SF6 gas, which is completely isolated from the external environment, effectively preventing the influence of external factors such as moisture and dust on the inside of the bushing, thus ensuring the insulation performance and stability of the bushing.

[0021] In this wall-piercing bushing, the silicone rubber umbrella skirt of the bushing uses high-temperature silicone rubber that is resistant to high and low temperatures and aging. This material has good hydrophobicity and can effectively prevent water from accumulating on the surface of the umbrella skirt, thereby improving the pollution flashover and rain flashover resistance of the bushing. Under different environmental conditions, such as high temperature, low temperature, and humidity, this material can maintain stable performance and improve the reliability of the bushing.

[0022] It should be noted that the temperature tolerance range of the silicone rubber of the wall-piercing bushing 1 is -50°C - 160°C, and the annual leakage rate of SF6 gas does not exceed 0.5%.

[0023] In practical applications, the cylinder of the wall bushing 1 is welded by aluminum alloy plates. Aluminum alloy has relatively high strength and good thermal conductivity, can withstand certain mechanical stresses, and also helps to conduct the heat generated inside the wall bushing 1 out. Installation holes for wall fixing are reserved on the cylinder, which facilitates installation and fixation, and ensures the stability of the bushing during use.

[0024] In this wall bushing, a plurality of bushing fixing flanges 4 are installed on the outer side of the wall bushing 1, and a plurality of heat storage wall fixing flanges 5 are embedded on the inner side of the heat storage wall 9. The number of the bushing fixing flanges 4 is adapted to the number of the heat storage wall fixing flanges 5, and the bushing fixing flanges 4 and the heat storage wall fixing flanges 5 are connected.

[0025] In practical applications, a plurality of cooling cover fixing flanges are embedded inside the other side of the heat storage wall 9. The heat storage wall 9 fixes the cooling cover 2 through the cooling cover fixing flanges and is sealed with a gasket.

[0026] In this wall bushing, the cooling cover 2 is made of a metal housing and has good thermal conductivity. A coolant circulation for temperature reduction is arranged inside the cooling cover 2. Through the circulating flow of the coolant, the heat generated by the wall bushing 1 can be quickly taken away. The coolant continuously absorbs heat during the circulation process and then transfers the heat to the cooling equipment for cooling.

[0027] In this wall bushing, the lengths of the wall bushing 1 on the inner and outer sides of the heat storage wall 9 are at least 1.4 meters, the length of the cooling cover 2 is at least 1.5 meters, the end of the cooling cover 2 is at least 1.5 meters away from the heat storage body 16, the diameter of the cooling cover 2 is at least 3 meters, and the distance between the cooling cover 2 and the conductor 14 is at least 1.5 meters.

[0028] In practical applications, the outer side of the cooling cover 2 is wrapped and protected with a heat insulation and thermal insulation layer 6. The heat insulation and thermal insulation layer 6 can effectively reduce the heat dissipation to the external environment and improve the cooling efficiency. At the same time, the heat insulation and thermal insulation layer 6 can also prevent the influence of the external high-temperature environment on the inside of the cooling cover 2, ensuring that the coolant can continuously and effectively carry out cooling.

[0029] It should be noted that the heat insulation and thermal insulation layer 6 is aluminosilicate fiber or aerogel, and the thermal conductivity of the heat insulation and thermal insulation layer 6 is 0.03 - 0.1 W / (m·K).

[0030] In this wall bushing, the end face of the cooling cover 2 is closed with an insulating baffle 10. The insulating baffle 10 can ensure electrical safety and prevent accidents such as electric leakage and short circuit. The material of the insulating baffle 10 should have good insulation performance and mechanical strength and can withstand a certain amount of pressure and impact force.

[0031] In practical applications, the cooling cover 2 and the insulating baffle 10 are sealed by a gasket. The material of the insulating baffle 10 is epoxy resin or polytetrafluoroethylene. The insulation resistance of the insulating baffle 10 is ≥ 100 megaohms, and the mechanical strength of the insulating baffle 10 is ≥ 10 kN impact force.

[0032] In this wall bushing, a cooling device 3 is provided outside the heat storage wall 9. The cooling device 3 is used to cool the circulating liquid. The cooling device 3 includes components such as a cooling fan 13 and a circulation pump 12. The cooling fan 13 dissipates heat to the surrounding environment by forced convection, and the circulation pump 12 is responsible for driving the coolant to circulate between the cooling cover 2 and the cooling device 3.

[0033] In practical applications, the cooling device 3 is connected to the cooling cover 2 through a pipeline 8. The pipeline 8 should have good heat conduction performance and sealing performance to ensure that the coolant can flow smoothly and there is no leakage. The cooling device 3 can reduce the temperature inside the cooling cover to the normal operating range, ensuring that the wall bushing 1 works at a safe temperature.

[0034] In this wall bushing, the cooling device 3 controls the temperature inside the cooling cover to be maintained at 40 - 60 °C. The temperature sensor preset the warning value. If the temperature sensor identifies that the temperature inside the cooling cover exceeds the warning value, the temperature sensor will automatically send an alarm signal. It should be noted that the accuracy of the temperature sensor is at least ±0.5 °C, and the range of the warning value is 70 - 80 °C.

[0035] It should be noted that the flow rate of the coolant is 0.5 - 2 m / s. The coolant is deionized water or a special coolant. The flow rate of the circulation pump 12 is 5 - 20 m³ / h, and the air volume of the cooling fan 13 is 1000 - 5000 m³ / h.

[0036] The present invention provides a circulating cooling high-voltage wall bushing for solid electric heat storage. The inside of the wall bushing is a 110 kV incoming line. The wall bushing uses a silicone rubber bushing with a rated voltage of 126 kV to ensure safe operation in a high-voltage environment. The wall bushing is completely isolated from the external environment by filling SF6 gas, effectively preventing the influence of external factors such as moisture and dust on the inside of the bushing, thereby ensuring the insulation performance and stability of the bushing. A temperature sensor is set inside the cooling cover as a temperature measurement point to be able to monitor the temperature inside the cooling cover in real time. The end face of the cooling cover uses an insulating baffle to effectively prevent accidents such as electric leakage and short circuit. Through the circulating flow of the coolant, the heat generated by the wall bushing can be quickly taken away, effectively solving the overheating problem faced by traditional wall bushings in solid electric heat storage systems. The working principle of this circulating cooling high-voltage wall bushing for solid electric heat storage is described in detail below: In this embodiment, the wall-penetrating bushing 1 is a silicone rubber bushing with a rated voltage of 126 kV. The bushing fixing flange 4 is connected to the heat storage wall fixing flange 5 embedded in the heat storage wall 9, and sealed with a rubber sealing ring. The cooling hood 2 is a stainless steel cylinder with a diameter greater than or equal to 3000 mm. The outer side of the cooling hood 2 is an insulating and heat-preserving layer 6. The heat exchange tubes 7 are arranged on the inner side of the cooling hood 2 and fixed by the pipe clamps embedded in the cooling hood 2. The heat storage wall 9 is fixed to the cooling hood 2 through the embedded cooling hood fixing flange and sealed with a high-temperature resistant gasket. An insulating baffle 10 is installed at the end face of the cooling hood 2, and the insulating baffle 10, the wiring board 11 and the outer cylinder of the cooling hood 2 are all sealed with high-temperature resistant sealing rings. The cooling device 3 is connected to the cooling hood 2 through a pipeline 8. The heat exchange medium is circulated by the circulating pump 12 in the cooling device 3 and cooled by the cooling fan 13 for circulation. The length of the wall-penetrating bushing 1 inside and outside the heat storage wall 9 is about 1.4 m, the length of the cooling hood is about 1.5 m, the distance from the end of the cooling hood to the heat storage body is about 1.5 m, the diameter of the cooling hood is about 3 m, and the closest distance to the conductor is about 1.5 m, meeting the minimum insulation distance requirements for the 126 kV voltage class. When the circulating cooling high-voltage wall-penetrating bushing operates, the internal temperature of the cooling hood can be effectively controlled within 80°C.

[0037] In practical applications, the wall-penetrating bushing 1 uses a silicone rubber bushing with a rated voltage of 126 kV. Silicone rubber has good insulation performance, and its insulation resistance can usually reach several thousand megohms or even higher, ensuring safe operation in a high-voltage environment. At the same time, the flexibility of silicone rubber enables the bushing to withstand a certain degree of mechanical stress without damage.

[0038] In this embodiment, the inside of the wall-penetrating bushing 1 is airtight and filled with SF6 gas. SF6 gas has excellent insulation performance and arc extinguishing ability, effectively preventing the influence of external factors such as moisture and dust on the inside of the wall-penetrating bushing 1. Through strict sealing processes, the airtightness of the wall-penetrating bushing 1 is ensured, and the leakage rate of SF6 gas is controlled at an extremely low level, for example, the annual leakage rate does not exceed 0.5%.

[0039] In practical applications, the umbrella skirt of the silicone rubber bushing uses high-temperature silicone rubber that is resistant to high and low temperatures and aging. This material can still maintain good performance at high temperatures, such as 150°C and above, and will not embrittle at low temperatures, such as -40°C and below. Its aging resistance is verified through accelerated aging tests. Under the conditions of simulating the actual use environment, after thousands of hours of aging tests, the performance of the material decreases by no more than 10%.

[0040] In this embodiment, the cylinder body of the wall-piercing bushing 1 is welded by aluminum alloy plates. Aluminum alloy has relatively high strength, and its yield strength can reach more than 200 MPa, capable of withstanding a certain amount of mechanical stress. At the same time, aluminum alloy has good thermal conductivity, with a thermal conductivity coefficient of about 160 W / (m・K), which helps to conduct the heat generated inside the bushing out. Installation holes for wall fixation are reserved on the cylinder body. The size and position of the installation holes are precisely designed to facilitate installation and fixation, ensuring the stability of the bushing during use.

[0041] In practical applications, the cooling cover 2 uses a metal cover body. Common metal materials such as stainless steel or aluminum alloy have good thermal conductivity. The thermal conductivity coefficient is usually between dozens and hundreds of W / (m・K), and can quickly transfer the heat generated by the wall-piercing bushing 1 to the internal coolant.

[0042] In this embodiment, a coolant circulation channel is provided inside the cooling cover 2. The coolant usually uses a liquid with good thermal conductivity and stability, such as deionized water or a special coolant. The flow rate of the coolant can be adjusted according to the actual situation, generally between 0.5 - 2 m / s. Through the circulating flow of the coolant, the heat generated by the wall-piercing bushing 1 can be quickly taken away. During the circulation process, the coolant continuously absorbs heat and the temperature rises, and then transfers the heat to the cooling device 3 for cooling.

[0043] In practical applications, the outer side of the cooling cover 2 is wrapped and protected by a heat-insulating and heat-preserving layer 6. The heat-insulating and heat-preserving layer 6 can be selected from aluminosilicate fiber, aerogel, etc. Its thermal conductivity coefficient is usually between 0.03 - 0.1 W / (m・K), which can effectively reduce the heat dissipation to the external environment and improve the cooling efficiency. For example, after using aluminosilicate fiber to wrap the cooling cover 2, the surface temperature of the cooling cover 2 can be reduced by 20 - 30 °C.

[0044] In this embodiment, the end face of the cooling cover 2 is closed with an insulating board. The material of the insulating baffle 10 can be selected from epoxy resin, polytetrafluoroethylene, etc., which has good insulation performance, and the insulation resistance can reach hundreds of megohms or more. At the same time, it has relatively high mechanical strength and can withstand a certain amount of pressure and impact force. For example, it can withstand an impact force of more than 10 kN without damage.

[0045] In practical applications, a cooling device 3 is arranged outside the heat storage wall 9. The cooling device 3 is used to cool the circulating liquid. The cooling device 3 includes components such as a cooling fan 13 and a circulation pump 12. The cooling fan 13 dissipates heat to the surrounding environment through forced convection. The air volume of the cooling fan 13 is usually between 1000 - 5000 m³ / h, which can quickly take away the heat in the cooling device 3. The circulation pump 12 is responsible for driving the coolant to circulate between the cooling cover 2 and the cooling device 3. The flow rate of the circulation pump 12 can be selected according to the actual demand, generally between 5 - 20 m³ / h.

[0046] In this embodiment, the cooling device 3 is connected to the cooling cover 2 through the pipe 8. The pipe 8 is made of materials such as stainless steel or copper, and has good thermal conductivity and sealing. The thermal conductivity is usually between tens and hundreds of W / (m・K), ensuring that the coolant can flow smoothly and will not leak. Through the sealing connection process, the leakage rate of the pipe 8 is controlled at an extremely low level, for example, the leakage per hour does not exceed 10ml.

[0047] In practical applications, the cooling device 3 can reduce the temperature inside the cooling cover to a normal operating range, generally controlling the temperature between 40-60° C., to ensure that the wall bushing 1 operates at a safe temperature.

[0048] In this embodiment, a temperature measuring point is set inside the cooling cover 2, and a high-precision temperature sensor, such as a platinum resistance temperature sensor or a thermocouple, is used in the temperature measuring point. The accuracy of the temperature sensor can reach ±0.5°C or even higher, and the temperature inside the cooling cover can be monitored in real time. When the temperature is abnormal, the temperature sensor will send an alarm signal, and the alarm temperature can be set according to the actual situation, generally set at 70-80°C. So that timely measures can be taken to ensure the safe operation of the system.

[0049] In practical applications, this embodiment adopts a circulating cooling system, which can quickly remove the heat generated by the wall bushing 1 through the circulation of the coolant, effectively solving the overheating problem faced by the traditional wall bushing 1 in the solid electric thermal storage system. The circulating cooling system can automatically adjust the flow rate and flow velocity of the coolant according to the actual temperature conditions, ensuring that the wall bushing 1 always works at an appropriate temperature.

[0050] In this embodiment, the material selection is optimized. The umbrella skirt of the wall bushing 1 is made of high-temperature silicone rubber that is resistant to high and low temperatures and aging. The cylinder is welded with aluminum alloy plates. The cooling cover 2 is made of a metal cover and thermal insulation materials. The selection of these materials takes into account both electrical performance and heat dissipation performance and mechanical strength, and can meet the special requirements of the solid electric thermal storage system.

[0051] In practical applications, this embodiment introduces intelligent temperature monitoring and alarm. A temperature measuring point is set inside the cooling cover 2 to monitor the internal temperature of the cooling cover in real time. When the temperature is abnormal, the system will automatically send out an alarm signal to remind the staff to take timely measures. This intelligent temperature monitoring and alarm function improves the safety and reliability of the system.

[0052] The above implementation modes are only used to illustrate the present invention, but not to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention should be defined by the claims.

Claims

1. A circulating cooling high-voltage through-wall bushing for solid electric heat storage, characterized in that Including: A wall bushing (1), the inside of the wall bushing (1) is a 110KV incoming line, the wall bushing (1) passes through the heat storage wall (9), the wall bushing (1) is connected to the heat storage wall (9), a cooling cover (2) is installed on the other side of the heat storage wall (9), the rear half of the wall bushing (1) is inserted into the cooling cover (2), one end of the cooling cover (2) is connected to a pipe (8), heat exchange tubes (7) are arranged inside the cooling cover (2), a heat insulation and thermal insulation layer (6) is installed outside the cooling cover (2), an insulating baffle (10) is installed at the other end of the cooling cover (2), a conductor (14) is installed at the tail end of the wall bushing (1), the conductor (14) is connected to a wiring board (11), the tail end of the wiring board (11) passes through the insulating baffle (10), the tail end of the wiring board (11) is connected to a heating wire (15), the other end of the heating wire (15) is connected to a heat storage body (16), the other end of the pipe (8) is connected to a cooling device (3), a circulation pump (12) and a cooling fan (13) are arranged inside the cooling device (3), the cooling fan (13) is connected to the circulation pump (12), and both the cooling fan (13) and the circulation pump (12) are connected to the pipe (8); The wall bushing (1) is a silicone rubber bushing with a rated voltage of 126kV, the inside of the wall bushing (1) is filled with SF6 gas, the wall bushing (1) isolates the external environment through the SF6 gas, the cooling cover (2) reduces the heat dissipation to the external environment through the heat insulation and thermal insulation layer (6), a coolant circulation channel is arranged inside the cooling cover (2), coolant flows in the coolant channel, the cooling cover (2) maintains electrical safety through the insulating baffle (10), the circulation pump (12) drives the coolant to circulate between the cooling cover (2) and the cooling device (3), the cooling fan (13) dissipates heat to the surrounding environment through forced convection, the pipe (8) is a flow channel for the coolant between the cooling device (3) and the cooling cover (2), a temperature sensor is arranged inside the cooling cover (2), and the cooling cover (2) monitors the internal temperature of the cooling cover in real time through the temperature sensor.

2. The circulating cooling high-voltage through-wall bushing for solid electric heat storage according to claim 1, wherein The temperature tolerance range of the silicone rubber of the wall bushing (1) is -50°C - 160°C, and the annual leakage rate of the SF6 gas does not exceed 0.5%.

3. The circulating cooling high-voltage through-wall bushing for solid electric heat storage according to claim 1, wherein A plurality of bushing fixing flanges (4) are installed outside the wall bushing (1), a plurality of heat storage wall fixing flanges (5) are embedded inside the heat storage wall (9), the number of the bushing fixing flanges (4) is adapted to the number of the heat storage wall fixing flanges (5), and the bushing fixing flanges (4) are connected to the heat storage wall fixing flanges (5).

4. The circulating cooling high-voltage through-wall bushing for solid electric heat storage according to claim 1, characterized in that, A plurality of cooling cover fixing flanges are embedded inside the other side of the heat storage wall (9), and the heat storage wall (9) fixes the cooling cover (2) through the cooling cover fixing flanges and seals it with a gasket.

5. The circulating cooling high-voltage through-wall bushing for solid electric heat storage according to claim 1, characterized in that The length of the wall bushing (1) on the inner and outer sides of the heat storage wall (9) is at least 1.4 meters, the length of the cooling hood (2) is at least 1.5 meters, the end of the cooling hood (2) is at least 1.5 meters away from the heat storage body (16), the diameter of the cooling hood (2) is at least 3 meters, and the distance between the cooling hood (2) and the conductor (14) is at least 1.5 meters.

6. The circulating cooling high-voltage through-wall bushing for solid electric heat storage according to claim 1, characterized in that, The cooling hood (2) and the insulating baffle (10) are sealed by a gasket. The material of the insulating baffle (10) is epoxy resin or polytetrafluoroethylene. The insulation resistance of the insulating baffle (10) is ≥100 MΩ, and the mechanical strength of the insulating baffle (10) is ≥10 kN impact force.

7. The circulating cooling high-voltage through-wall bushing for solid electric heat storage according to claim 1, characterized in that, The cooling device (3) controls the internal temperature of the cooling hood to be maintained at 40 - 60 °C. The temperature sensor presets a warning value. If the temperature sensor identifies that the internal temperature of the cooling hood exceeds the warning value, the temperature sensor will automatically send an alarm signal.

8. The circulating cooling high-voltage through-wall bushing for solid electric heat storage according to claim 7, characterized in that, The accuracy of the temperature sensor is at least ±0.5 °C, and the range of the warning value is 70 - 80 °C.

9. The circulating cooling high-voltage wall-through bushing for solid electric heat storage according to claim 1, characterized in that The flow rate of the coolant is 0.5 - 2 m / s. The coolant is deionized water or a special coolant. The flow rate of the circulation pump (12) is 5 - 20 m³ / h, and the air volume of the cooling fan (13) is 1000 - 5000 m³ / h.

10. The circulating cooling high-voltage through-wall bushing for solid electric heat storage according to claim 1, characterized in that, The heat insulation layer (6) is aluminosilicate fiber or aerogel, and the thermal conductivity of the heat insulation layer (6) is 0.03 - 0.1 W / (m·K).

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