High-voltage wall bushing device

Abstract

The invention discloses a high-voltage wall bushing device, and relates to the technical field of high-voltage lines, and the device comprises a wall plate, and one side of the wall plate is fixedly provided with a housing; a thermal insulation material is arranged on the outer side of the shell, and a thermal insulation cavity is formed between the shell and the wallboard; the wallboard is provided with an air inlet and an air outlet which are communicated with the heat preservation cavity, and the air outlet is internally provided with air exchange equipment used for driving out hot air in the heat preservation cavity; the casing pipe penetrates through the wall plate, the two ends of the casing pipe are located inside and outside the heat preservation cavity respectively, and the end, located inside the heat preservation cavity, of the casing pipe is connected with a terminal stud installed in the shell and the heat preservation material; the sleeve comprises a conducting rod and a multi-layer composite insulating material arranged outside the conducting rod, and the thermal expansion coefficients of the multi-layer composite insulating material are sequentially increased from inside to outside; heat preservation protection is carried out through the heat preservation cavity formed by the wall plate made of the aluminum oxide ceramic material and the shell, the sleeve is prevented from being affected by high temperature, and meanwhile the multiple layers of composite insulating materials with the thermal expansion coefficient gradually increased from inside to outside play a better protection role on the conducting rod.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-voltage lines, in particular to a high-voltage bushing device. BACKGROUND

[0002] In the operating environment of a 110KV electric heat storage boiler, the temperature can reach up to 800℃. This high-temperature environment has a great impact on power transmission facilities such as high-voltage lines. On the one hand, high temperature will increase the resistance of high-voltage lines, leading to increased energy transmission loss and reduced energy utilization efficiency. On the other hand, high temperature will cause thermal expansion of high-voltage lines, affecting their mechanical and safety performance, and even causing power accidents, which will have a serious impact on equipment operation.

[0003] In addition, the continuous high temperature generated by the electric heat storage boiler during operation can also accelerate the aging of the insulation material of the high-voltage line, reduce its insulation performance, and increase the risk of electric leakage and short circuit. Moreover, in a high-temperature environment, the air around the high-voltage line expands due to heating, which may affect the electric field distribution and have an adverse effect on the stability of power transmission. At the same time, since electric heat storage boilers are usually used in important fields such as industrial production and central heating, once the high-voltage line fails due to the influence of high temperature, it will bring huge economic losses to the relevant industries, and even may affect the normal operation of society. SUMMARY

[0004] The purpose of the present application is to provide a high-voltage bushing device to solve the following technical problems: How to improve the safety and efficiency of high-voltage lines in power transmission under high temperature and high pressure.

[0005] The purpose of the present application can be achieved by the following technical solutions: A high-voltage bushing device, comprising a wallboard, one side of which is fixedly installed with a shell; the outer side of the shell is provided with thermal insulation material, and a thermal insulation cavity is formed between the thermal insulation material and the wallboard; The wallboard is provided with an air inlet and an air outlet communicating with the thermal insulation cavity, and a ventilation device is arranged in the air outlet to drive out the hot air in the thermal insulation cavity; Further comprising a bushing, which is arranged in the wallboard and has two ends located inside and outside the thermal insulation cavity, respectively, wherein one end located inside the thermal insulation cavity is connected with a terminal installed in the shell and the thermal insulation material; The bushing comprises a conductive rod and a plurality of layers of composite insulation material arranged outside the conductive rod, and the thermal expansion coefficients of the plurality of layers of composite insulation material increase successively from inside to outside.

[0006] In a further embodiment of the present application, the material of the wallboard is alumina ceramic.

[0007] In a further embodiment of the present application, the plurality of layers of composite insulation material successively comprise a high-aluminum tube, a mica tube and a rainproof porcelain sleeve from inside to outside.

[0008] In a further aspect of the present application, a sieve plate is installed in the air inlet, and the sieve plate is provided with a plurality of sieve holes, the sieve holes have a decreasing diameter, and the side with a larger diameter is located outside the wall plate.

[0009] In a further aspect of the present application, the ventilation device is a fan.

[0010] In a further aspect of the present application, the conductive rod is composed of a plurality of square 316 stainless steel thin strips with a side length of 1 mm.

[0011] In a further aspect of the present application, the conductive rod includes 13 layers of square 316 stainless steel thin strips, and each layer has 14 thin strips.

[0012] In a further aspect of the present application, the lower side of the shell is provided with a magnesite brick for supporting the shell.

[0013] In a further aspect of the present application, the wall plate is externally provided with a supporting mechanism for supporting the bushing.

[0014] In a further aspect of the present application, the supporting mechanism includes an insulating porcelain bottle and a supporting frame, the insulating porcelain bottle is installed on the supporting frame, and the end of the bushing away from the terminal head is fixed on the insulating porcelain bottle.

[0015] Advantages of the present application: (1) The high-voltage bushing device of the present application forms a heat preservation cavity with the wall plate and the shell made of alumina ceramic material, thereby protecting the bushing from high temperature, especially the combination of alumina ceramic and external heat preservation material can effectively block the high-temperature air around the storage furnace, providing a relatively low-temperature environment for the bushing, which can slow down the aging speed of the insulating material and improve the service life of the bushing; the alumina ceramic as the shell of the heat preservation cavity also has excellent insulation performance, which can provide additional insulation protection for the bushing; the external heat preservation material can also reduce the influence of impurities such as dust and water vapor on the insulation performance; the heat preservation chamber can reduce the interference of external electric field and magnetic field, improve the transmission efficiency and stability of high-voltage line, and effectively increase the insulation and explosion-proof performance through structure and material.

[0016] (2) In the high-voltage through-wall bushing device of the present invention, the outer side of the conductive rod is provided with a multi-layer composite insulating material with a gradually increasing coefficient of thermal expansion from the inside to the outside, which provides better protection for the conductive rod; the bushing also achieves sufficient heat exchange through the air inlet with a sieve plate and the air outlet with a fan, keeping the air in the insulation cavity dry and clean, preventing water vapor condensation and the accumulation of conductive dust, thereby maintaining the stable insulation performance of the bushing; it provides a relatively stable temperature and humidity environment for the bushing in the insulation cavity, reduces the thermal expansion and contraction and other adverse effects caused by environmental changes, and ensures the stable operation of the power system.

[0017] (3) The air inlet of the high-pressure through-wall bushing device of the present invention is provided with a sieve plate, wherein the sieve hole diameter design further improves the heat exchange effect, thereby improving the high temperature resistance of the bushing as a whole, which is conducive to the normal and safe operation of the bushing under high temperature and high pressure. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the high-pressure through-wall bushing device in one embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of the bushing structure in a high-pressure through-wall bushing device; Figure 3 yes Figure 2 A schematic diagram of the conductive rod in the sleeve; Figure 4 yes Figure 1 Left view of the high-pressure through-wall bushing device; Figure 5 yes Figure 4 A schematic diagram of the structure of the screen plate in the air outlet of the high-pressure through-wall bushing device.

[0020] In the diagram: 1. Wall panel; 2. PLC control system; 3. Temperature sensor; 4. Air outlet; 5. Sleeve; 51. Conductive rod; 52. High-alumina tube; 53. Mica tube; 54. Rainproof porcelain sleeve; 6. Insulating porcelain bottle; 7. Support frame; 8. Air inlet; 9. Shell; 10. Insulation material; 11. Wiring terminal; 12. Magnesia brick; 13. Sieve plate; 1301. Sieve hole. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Embodiment 1

[0023] Referring to Figure 1 The embodiment discloses a high-voltage bushing device, which comprises a wallboard 1 fixedly established on a mounting base (ground), and the wallboard 1 is made of alumina ceramic which has a very high resistivity and can effectively prevent current from passing through the wallboard, thereby avoiding the risk of electric leakage and short circuit.

[0024] A shell 9 is mounted on the right side of the wallboard 1, and the shell 9 is also made of alumina ceramic; a screw hole is formed in the wallboard 1, and the edge of the shell 9 is mounted in the screw hole of the wallboard 1 through a bolt and a nut, so as to realize fixed connection with the wallboard 1, so that the space between the wallboard 1 and the shell 9 forms a heat preservation cavity. The joint between the wallboard 1 and the shell 9 is fixed through high-temperature epoxy glue, so as to ensure the sealing performance of the heat preservation cavity and improve the heat preservation performance.

[0025] The shell 9 is externally provided with a heat preservation material 10, and the type of the heat preservation material 10 is not limited in particular, and only needs to have a heat preservation effect in an environment of ≥700 DEG C, for example, in the embodiment, the heat preservation material 10 is made of aluminum silicate fiber material.

[0026] The bottom of the shell 9 is provided with a magnesite brick 12 established from the mounting base to support, so as to improve the stability of the shell 9.

[0027] A bushing 5 is provided on the wallboard 1, the right end of the bushing 5 extends into the heat preservation cavity, and the left end extends to the outside of the left side of the wallboard 1; the bushing 1 is composed of a conductive rod 51 and a plurality of layers of composite insulation materials arranged outside the conductive rod 51, and the thermal expansion coefficients of the plurality of layers of composite insulation materials increase in turn from inside to outside.

[0028] Referring to Figure 2 The plurality of layers of composite insulation materials are in turn a high-aluminum tube 52, a mica tube 53 and a rainproof porcelain sleeve 54, that is, the high-aluminum tube 52 is sleeved outside the conductive rod 51, the mica tube 53 is sleeved outside the high-aluminum tube 52, and the rainproof porcelain sleeve 54 is sleeved outside the mica tube 53.

[0029] Specifically, the high-aluminum tube 52 with the smallest thermal expansion coefficient is arranged at the innermost side, and the reasons are as follows: Firstly, when the temperature of the bushing 5 changes in work, the size change of the high-aluminum tube 52 is relatively weak, which can provide a stable support and insulation environment for the conductive rod 51 inside; on the contrary, if the material with a large thermal expansion coefficient is arranged in the inner layer, the violent expansion or contraction when the temperature changes is easy to extrude the conductive rod 51, which will affect the normal work of the conductive rod 51 after a long time, and even may cause partial discharge or short circuit and other faults, based on this, it can be determined that arranging the high-aluminum tube 52 at the innermost layer can effectively reduce the adverse effects of thermal expansion and contraction on the conductive rod 51.

[0030] Secondly, the high-aluminum tube 52 has excellent electrical insulation performance and can withstand high electric field intensity. When placed in the innermost layer, it can provide reliable insulation protection for the conductive rod 51, prevent electric field concentration and partial discharge, ensure stable current flow in the specified path, and ensure the safe operation of the sleeve 5.

[0031] Finally, the high-aluminum tube 52 has high mechanical strength and can provide solid inner support for the overall structure of the sleeve 5. During installation and use, the sleeve 5 may be subjected to various mechanical pressures and external force impacts. The high-aluminum tube 52 can effectively protect the internal conductive part from damage, maintain the structural stability of the sleeve 5, and its high hardness can also ensure the accuracy of the inner diameter size of the sleeve 5, facilitating the smooth passage of the conductive rod 51 and maintaining the appropriate gap.

[0032] Please refer to Figure 3 The specific type of the conductive rod 51 is not limited, and in this embodiment, the conductive rod 51 is composed of multiple square 316 stainless steel strips with a side length of 1 mm. Specifically, it includes 13 layers of square 316 stainless steel strips, with 14 strips in each layer.

[0033] The right side wall of the shell 9 is provided with a terminal 11, which extends through the thermal insulation material 10 to the right side of the shell 9. The right end of the terminal 11 is connected with the resistance wire in the heat storage boiler, and the left end is connected with the conductive rod 51 in the sleeve 5. The left end of the conductive rod 51 in the sleeve 5 is connected with the power supply, thereby forming a power supply path. The circuit transmission direction is power supply, conductive rod, resistance wire, and heat storage boiler in turn. A support frame 7 is provided on the mounting base on the left side of the wallboard 1, and an insulating porcelain bottle 6 is mounted on the support frame 7. The support frame 7 and the insulating porcelain bottle 6 form a support mechanism, which can be used to support the left end of the sleeve 5. Specifically, the conductive rod 51 at the left end of the sleeve 5 is fixedly installed on the insulating porcelain bottle 6 by punching and installing screws.

[0034] As can be seen, after the sleeve 5 penetrates the wall, it enters the thermal insulation cavity and is connected with the terminal 11 inside the thermal insulation cavity, thereby realizing power supply for the heat storage boiler. The materials of the wallboard 1 and the shell 9 are both alumina ceramic, i.e., the outer walls of the thermal insulation cavity are all alumina ceramic. As mentioned earlier, alumina ceramic has extremely high resistivity, which can effectively prevent current from passing through the wallboard, avoiding the risk of electric shock and short circuit. This can ensure the safe operation of the power system of the sleeve 5. In a high-voltage environment, alumina ceramic can maintain its insulation performance and prevent current leakage into the surrounding environment. Alumina ceramic has extremely high insulation strength and can withstand high voltage without breakdown, providing a reliable insulation barrier for the sleeve 5. Therefore, the sleeve 5 can adopt a larger creepage distance to improve insulation performance and safety.

[0035] In addition, the dielectric constant of alumina ceramic is low, which means that its polarization degree in the electric field is small; a low dielectric constant can reduce the concentration of the electric field in the wallboard 1, thereby reducing the risk of surface discharge and helping to increase the effectiveness of the creepage distance, improving the insulation performance of the bushing 5; in the event of an accidental impact, the alumina ceramic can maintain the integrity of the wallboard 1, thereby protecting the internal bushing 5 from damage; for example, in the case of natural disasters such as earthquakes or human collisions, the wallboard 1 can effectively resist impact and ensure the normal operation of the power system; moreover, the alumina ceramic has excellent high-temperature resistance and will not deform, soften or melt in high-temperature environments; during the operation of the electric heat storage boiler, some heat will be generated, and the wallboard 1 can withstand this heat to maintain its insulation performance and mechanical strength; finally, the alumina ceramic can be manufactured through precision machining, and the dimensional accuracy can reach a very high level; this enables the wallboard 1 to closely match the bushing 5, ensuring the accuracy and sealing of the installation.

[0036] Referring to Figure 4 The wallboard 1 is provided with an air inlet 8 and an air outlet 4 that communicate with the heat preservation cavity, wherein the air inlet 8 is located below the bushing 5, and the air outlet is located above the bushing 5; a ventilation device is arranged in the air outlet 4 to drive the hot gas in the heat preservation cavity out, and the specific type of the ventilation device is not limited; for example, in this embodiment, the ventilation device is a fan that sucks air outside the wallboard 1 into the heat preservation cavity through the air inlet 8, exchanges heat with the bushing 5 in the heat preservation cavity, and then discharges the hot gas through the air outlet 4, thereby maintaining a low-temperature environment in the heat preservation cavity and preventing the bushing 5 from being affected by high temperatures.

[0037] Referring to Figure 5 A sieve plate 13 is installed in the air inlet 8, and a plurality of sieve holes 1301 are arranged on the sieve plate 13; the sieve holes 1301 have a decreasing diameter from the outside to the inside, and the side with the larger diameter is located on the outside of the wallboard 1; the sieve holes 1301 can filter impurities in the external environment to prevent the impurities from adhering to the bushing 5 in the heat preservation cavity and affecting heat dissipation of the bushing 5; at the same time, since the sieve holes 1301 have a decreasing diameter, their cross sections are in the shape of a circular truncated cone with a slope from the inside to the outside; therefore, when rain splashes into the sieve holes 1301, the rain flows outward along the slope under the action of gravity, thereby preventing the rain from entering the heat preservation cavity and avoiding water accumulation in the heat preservation cavity; at the same time, the rain carries the impurities adhering to the sieve holes 1301 out during the flow process, thereby achieving a self-cleaning effect; more importantly, since the sieve holes 1301 have a gradually decreasing diameter from the outside to the inside, the flow rate of the gas entering the heat preservation cavity gradually increases, and the temperature of the gas decreases; therefore, the heat exchange effect between the low-temperature air entering the heat preservation cavity and the bushing 5 is better, thereby further preventing the bushing 5 from being affected by high temperatures.

[0038] Further, the wallboard 1 is provided with a PLC control system 2 outside, and a temperature sensor 3 is arranged inside the wallboard 1 and is in communication connection with the PLC control system 2, and the PLC control system 2 is also in communication connection with the fan; the temperature sensor 3 detects the temperature inside the heat preservation cavity and transmits the temperature to the PLC control system 2 in real time, and the PLC control system 2 automatically controls the wind speed of the fan according to the received temperature signal, so that the temperature inside the heat preservation cavity is always kept in a set range.

[0039] The working principle of the embodiment is as follows: the high-voltage bushing device of the application is protected by the heat preservation cavity formed by the wallboard 1 and the shell 9 during work, so that the bushing 5 is prevented from being affected by high temperature, meanwhile, the multi-layer composite insulation material with gradually increasing thermal expansion coefficients from inside to outside of the bushing 5 plays a better protective role on the conductive rod 51, finally, the bushing 5 is fully heat-exchanged through the air inlet provided with the sieve plate 13 and the air outlet provided with the fan, and the hole diameter of the sieve hole 1301 in the sieve plate 13 is designed to further improve the heat exchange effect, so that the high-temperature resistance of the bushing 5 is improved as a whole, which is beneficial to the normal and safe operation of the bushing 5 under high temperature and high pressure.

[0040] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation and a particular orientation structure and operation, therefore, it cannot be understood as a limitation on the present application. In addition, "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0041] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between the two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] The above describes one embodiment of the present application in detail, but the content described is only the preferred embodiment of the present application, and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made within the scope of the present application shall still belong to the patent scope of the present application.

Claims

1. A high voltage bushing arrangement, characterized by The wallboard (1) is fixedly installed with a shell (9) on one side, and the outer side of the shell (9) is provided with a heat preservation material (10) to form a heat preservation cavity with the wallboard (1); The wallboard (1) is provided with an air inlet (8) and an air outlet (4) which are communicated with the heat preservation cavity, and the air outlet (4) is provided with an air exchange device for driving out the hot air in the heat preservation cavity; The sleeve (5) is provided in the wallboard (1) and has two ends located inside and outside the heat preservation cavity, respectively, wherein the end located inside the heat preservation cavity is connected with a terminal (11) installed in the shell (9) and the heat preservation material (10); The sleeve (5) comprises a conductive rod (51) and a plurality of layers of composite insulation materials provided outside the conductive rod (51), and the thermal expansion coefficients of the composite insulation materials increase from inside to outside.

2. The high voltage bushing arrangement of claim 1, wherein, The wallboard (1) is made of alumina ceramic.

3. The high voltage bushing apparatus of claim 1, wherein, The composite insulation materials from inside to outside are a high-aluminum tube (52), a mica tube (53) and a rainproof porcelain sleeve (54).

4. The high voltage bushing apparatus of claim 1, wherein, The air inlet (8) is provided with a sieve plate (13) having a plurality of sieve holes (1301) with diameters decreasing from one side to the other side, and the side with larger diameters is located outside the wallboard (1).

5. The high voltage bushing apparatus of claim 1, wherein, The air exchange device is a fan.

6. The high voltage bushing apparatus of claim 1, wherein, The conductive rod (51) is made of a plurality of square 316 stainless steel strips with a cross-sectional side length of 1mm.

7. The high-voltage bushing arrangement according to claim 6, characterized in that The conductive rod (51) comprises 13 layers of square 316 stainless steel strips, and each layer has 14 strips.

8. The high voltage bushing apparatus of claim 1, wherein, The lower side of the shell (9) is provided with a magnesium brick for supporting the shell (9).

9. The high voltage bushing apparatus of claim 1, wherein, The outer side of the wallboard (1) is provided with a supporting mechanism for supporting the sleeve (5).

10. The high-voltage bushing arrangement of claim 9, characterized in that The supporting mechanism comprises an insulating porcelain bottle (6) and a supporting frame (7), the insulating porcelain bottle (6) is installed on the supporting frame (7), and the end of the sleeve (5) away from the terminal (11) is fixedly provided on the insulating porcelain bottle (6).

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