A dry self-healing high voltage power capacitor

Abstract

The invention relates to the technical field of capacitors, and specifically to a dry self-healing high-voltage power capacitor, comprising a circular aluminum can of a capacitor, wherein a top cover is arranged at the upper end of the circular aluminum can of the capacitor, and a sealed bottom cover is arranged at the bottom of the circular aluminum can of the capacitor, and the beneficial effects are as follows: a triple-enclosed cylindrical can is formed by the top cover, an inner sealing sleeve and an electrical connection end, and three self-healing capacitor winding elements are sealed and sealed, and the gap is filled with environmentally friendly insulating gas nitrogen, which can reduce the dielectric loss of the capacitor, improve the reliability of operation, meet the requirements of miniaturization of the capacitor volume and facilitate installation, and explosion-proof partitions are arranged between the three groups of self-healing capacitor winding elements as explosion-proof partitions. When one of the self-healing capacitor winding elements fails or short-circuits, resulting in local overheating or even explosion, the deformable partition sheet can deform to pull the connecting wire to disconnect, limit energy, prevent diffusion to other windings, and reduce the risk of chain reaction.

Description

Technical Field

[0001] The invention belongs to the technical field of capacitors, and in particular relates to a dry self-healing high-voltage power capacitor. Background Art

[0002] High-voltage power capacitors are one of the key devices used in high-voltage power systems. They are mainly used to improve the power factor of the power grid, filter harmonics, and improve system stability. High-voltage power capacitors can store charge and work in a high-voltage environment. Their working principle is to provide capacitive reactive power in the high-voltage power system to offset the inductive reactive power generated by the load, thereby improving the power factor of the entire system. There are mainly three types: oil-immersed capacitors, dry capacitors, and metallized film capacitors. Oil-immersed capacitors are filled with mineral oil as an insulating medium and are suitable for higher voltage levels. Dry capacitors use solid materials as insulating media, are smaller in size, and are suitable for lower voltage levels. Metallized film capacitors use metallized film as a dielectric layer, have self-healing capabilities, and are suitable for high-voltage occasions. At present, self-healing capacitors use a single layer of polypropylene film as a medium, and a thin layer of metal is evaporated on the surface as a conductive electrode. When too high a voltage is applied, the electrical weak point of the polypropylene film is broken down, the impedance of the breakdown point is significantly reduced, and the current density flowing through it increases sharply, causing the metallized coating to generate high heat. The metal conductor around the breakdown point quickly evaporates and dissipates, forming a blank area of ​​the metal coating. The breakdown point automatically restores insulation, but the high-voltage breakdown process will generate very high heat, so it is very important to dissipate the heat of the capacitor in a timely manner.

[0003] The existing Chinese patent document with publication number CN109903991B proposes a dry self-healing high-voltage power capacitor, which adopts an installation box added to the outside of the capacitor, and a heat dissipation unit is arranged in the installation box. The heat dissipation unit includes a refrigerant heat dissipation group and a wind heat dissipation group. The wind heat dissipation group includes a rotating ring, a gear ring and an impeller. The refrigerant heat dissipation group includes a copper tube and a water tank to solve the heat dissipation problem of the capacitor. However, too many external heat dissipation components are not convenient for the installation of the capacitor, and the overvoltage and increasing self-healing damage of the capacitor will lead to an increase in the internal pressure of the capacitor, which is prone to sudden rupture.

[0004] Therefore, the present invention proposes a dry self-healing high-voltage power capacitor to solve the problem that the existing technology has too many peripheral heat dissipation components that are inconvenient to install the capacitor, and the overvoltage and increasing self-healing damage of the capacitor will lead to an increase in the internal pressure of the capacitor, which is prone to sudden rupture. A pressure release structure is added to the cylindrical aluminum can of the capacitor and designed as a triangular connection point connected inside the capacitor. The top of the capacitor is pushed up by pulling open the pleated part, thereby achieving the purpose of releasing pressure. At the same time, the metal wire connected to the top is also broken due to the rise of the top, which effectively blocks the flow of current and prevents the capacitor from exploding due to overload and overheating. Summary of the invention

[0005] In view of the shortcomings of the prior art, the object of the present invention is to provide a dry self-healing high-voltage power capacitor to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a dry self-healing high-voltage power capacitor, comprising a circular aluminum can of a capacitor, a top cover is arranged at the upper end of the circular aluminum can of the capacitor, a sealed bottom cover is arranged at the bottom of the circular aluminum can of the capacitor, an inner sealing sleeve is arranged on the inner side of the circular aluminum can of the capacitor, an insulating fixing plate is arranged above the inner side wall of the inner sealing sleeve, the interior of the inner sealing sleeve is filled with nitrogen, and a self-healing capacitor winding element is arranged in the middle of the inner sealing sleeve.

[0007] Preferably, the upper and lower ends of the self-healing capacitor winding element are respectively provided with electrode lead-out points, and the self-healing capacitor winding element is provided in three groups. The three groups of self-healing capacitor winding elements are vertically stacked and placed inside the inner sealing sleeve, and the outsides of the three groups of self-healing capacitor winding elements are all covered with high-temperature ceramic protective sleeves.

[0008] Preferably, an explosion-proof partition is provided between the self-healing capacitor winding elements, the explosion-proof partition is fixedly mounted on the side wall of the inner sealing sleeve, the interior of the explosion-proof partition is evenly distributed with deformable partition sheets, and an insulating safety sleeve is fixedly mounted inside the deformable partition sheet.

[0009] Preferably, a triangular connecting key is fixedly installed in the middle of the insulating fixing plate, one side of the triangular connecting key is electrically connected to a discharge resistor, a connecting wire is fixedly installed at the connection input end of the triangular connecting key, the connecting wire is electrically connected to the electrode lead-out point, a fuse break point is arranged near the middle of the insulating fuse sleeve, and the insulating fuse sleeve is sleeved on the outer surface of one side of the fuse break point.

[0010] Preferably, the connection output end of the triangular connecting key is provided with an electric connection ring, a connecting pin 2 is symmetrically and movably installed on the inner side of the electric connection ring, a conductive gasket is fixedly installed below one end of the connecting pin 2, and an insulating gasket is fixedly installed above one end of the connecting pin 2.

[0011] Preferably, an electrical connection end is fixedly mounted in the upper middle portion of the top cover, a connection pin 1 is fixedly mounted at the lower end of the electrical connection end, and the lower end of the connection pin 1 overlaps the upper end of the connection pin 2.

[0012] Preferably, heat dissipation holes are evenly distributed on the surface of the top cover, an inner folding plate is fixedly mounted on the lower surface of the top cover, and a sealing column is arranged on the inner side of the inner folding plate.

[0013] Preferably, an insulating sealing ball is fixedly mounted on the upper end of the sealing column, the upper end of the insulating sealing ball is in contact with the bottom of the heat dissipation hole, and an extruded C-shaped sheet is fixedly mounted on the lower surface of the insulating sealing ball.

[0014] Preferably, the inner folding plate is an inner folding circular ring, an inner wall of one side of the inner folding plate is clamped with the side wall of the sealing column, a sliding groove is provided on the side wall of the sealing column, and the lower end of the extruded C-shaped sheet is fixedly connected to the upper inner surface of the sealing column.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] A triple-enclosed cylindrical tank is formed by a top cover, an inner sealing sleeve and an electrical connection end to seal the three self-healing capacitor winding elements. The gap is filled with environmentally friendly insulating gas nitrogen, which can reduce the dielectric loss of the capacitor and improve the reliability of operation. It meets the requirement of miniaturization of the capacitor and is easy to install. An explosion-proof partition is set between the three groups of self-healing capacitor winding elements as an explosion-proof partition. When one of the self-healing capacitor winding elements fails or short-circuits, causing local overheating or even explosion, the deformable partition sheet can deform to pull the connecting wire to disconnect, limit energy, prevent diffusion to other windings, and reduce the risk of chain reaction. The triangular connection key installed on the insulating fixing plate is designed as a triangular connection key point between the electrical connection end and the self-healing capacitor winding element. If overvoltage occurs or the capacitor is close to the end of its life, resulting in an increase in the internal pressure of the capacitor, the top cover solves the problem that the existing technology has too many heat dissipation components in the peripherals that are inconvenient for the installation of the capacitor, and the overvoltage and increasing self-healing damage of the capacitor will increase the internal pressure of the capacitor, which is prone to sudden rupture. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the top view structure of the capacitor of the present invention;

[0018] Figure 2It is a schematic diagram of the structure of the capacitor of the present invention when viewed from above;

[0019] Figure 3 This is a schematic diagram of the internal structure of the circular aluminum can of a capacitor of the present invention;

[0020] Figure 4 This is a schematic diagram of the cross-sectional structure of a circular aluminum can of a capacitor according to the present invention;

[0021] Figure 5 This is a schematic diagram of the triangular connection key structure of the capacitor of the present invention under normal use;

[0022] Figure 6 For the present invention Figure 5 A schematic diagram of the enlarged structure at point A;

[0023] Figure 7 For the present invention Figure 5 A schematic diagram of the enlarged structure at B;

[0024] Figure 8 It is a schematic diagram of the triangular connection key structure of the capacitor of the present invention in an overloaded use state;

[0025] Fig. 9 For the present invention Figure 8 A schematic diagram of the enlarged structure at C;

[0026] Fig.10 It is a schematic diagram of the structure of the top cover of the present invention in an expanded and lifted state;

[0027] Fig.11 For the present invention Fig.10 A schematic diagram of the structure at D of FIG.

[0028] Fig.12 This is a schematic structural diagram of the explosion-proof partition of the present invention in a normal state;

[0029] Fig.13 For the present invention Fig.12 A schematic diagram of the structure at E of FIG.

[0030] Fig.14 It is a schematic diagram of the structure of the explosion-proof partition of the present invention in a deformed state;

[0031] Fig.15 It is a schematic diagram of the cross-sectional structure of the explosion-proof partition of the present invention in a deformed state;

[0032] Fig.16 It is a schematic diagram of the structure of the self-healing capacitor winding element of the present invention.

[0033] In the figure: 1. Round aluminum can of capacitor; 2. Top cover; 21. Heat dissipation hole; 22. Inner folding plate; 23. Sealing column; 231. Insulating sealing ball; 232. Extruded C-shaped piece; 3. Electrical connection end; 31. Connecting pin one; 4. Sealed bottom cover; 5. Inner sealing sleeve; 6. Insulating fixing plate; 61. Triangular connecting key; 611. Connecting ring; 612. Connecting pin two; 613. Conductive gasket; 614. Insulating gasket; 62. Discharge resistor; 63. Connecting wire; 631. Fuse breakpoint; 7. High-temperature ceramic protective cover; 8. Self-healing capacitor winding component; 81. Electrode lead-out point; 9. Explosion-proof partition; 91. Deformable partition piece; 911. Insulating fuse. DETAILED DESCRIPTION

[0034] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Embodiment 1

[0036] See also Figures 1 to 16 The present invention provides a technical solution: comprising a circular aluminum can 1 for capacitors, a top cover 2 is arranged at the upper end of the circular aluminum can 1, a sealed bottom cover 4 is arranged at the bottom of the circular aluminum can 1, an inner sealing sleeve 5 is arranged on the inner side of the circular aluminum can 1, an insulating fixing plate 6 is arranged above the inner side wall of the inner sealing sleeve 5, the interior of the inner sealing sleeve 5 is filled with nitrogen, a self-healing capacitor winding element 8 is arranged in the middle of the inner sealing sleeve 5, the upper and lower ends of the self-healing capacitor winding element 8 are respectively provided with electrode lead-out points 81, the self-healing capacitor winding element 8 is provided with three groups, the three groups of self-healing capacitor winding elements 8 are vertically stacked and placed inside the inner sealing sleeve 5, and the outsides of the three groups of self-healing capacitor winding elements 8 are all covered with high-temperature ceramic An explosion-proof partition plate 9 is arranged between the protective sleeve 7 and the self-healing capacitor winding element 8. The explosion-proof partition plate 9 is fixedly installed on the side wall of the inner sealing sleeve 5. Deformed partition plates 91 are evenly distributed inside the explosion-proof partition plate 9. An insulating fuse sleeve 911 is fixedly installed inside the deformed partition plates 91. A triangular connecting key 61 is fixedly installed in the middle of the insulating fixing plate 6. A discharge resistor 62 is electrically connected to one side of the triangular connecting key 61. A connecting wire 63 is fixedly installed at the connection input end of the triangular connecting key 61. The connecting wire 63 is electrically connected to the electrode lead-out point 81. A fuse break point 631 is arranged near the middle of the insulating fuse sleeve 911 of the connecting wire 63. The insulating fuse sleeve 911 is sleeved on the outer surface of one side of the fuse break point 631.

[0037] In this embodiment, the self-healing capacitor winding element 8 is composed of a current-carrying metal layer electrode and a dielectric film with self-healing properties that are wound up layer by layer. After the current-carrying metal layer is broken down, it is vaporized and precipitated on one side of the film, but the dielectric film can be self-healed so that the capacitor does not affect the use. The current-carrying metal layer is connected by the upper and lower metal layers of the self-healing capacitor winding element 8. Electrode lead points 81 are respectively arranged on the outer sides of the metal layers for connecting the connecting wires 63. The current-carrying metal layer electrode is a metal coating under high vacuum, and the main components are zinc and aluminum. The edge at the connection with the metal layer is reinforced and designed as a thick edge, which plays an important role in suppressing large currents and ensuring capacitor stability. It has very superior self-healing properties, thick edges and special film cutting technology, and the optimized combination of corrugation and smooth cutting can produce the largest effective surface for metal spraying or bonding processing, so that the capacitor has a high surge current suppression capability. In addition, due to the alternating design of the film edge and the metal layer thick edge, the edge contact problem caused by the shrinkage effect is also fully solved;

[0038] In this embodiment, the top cover 2, the inner sealing sleeve 5 and the electrical connection end 3 form a triple-enclosed cylindrical tank, the sealed bottom cover 4 at the bottom also increases the sealing performance, the high-temperature ceramic protective sleeve 7 makes the contact layer more stable and isolates the high temperature, and the three groups of self-healing capacitor winding elements 8 are sealed and sealed. The gap is filled with environmentally friendly insulating gas nitrogen, which can reduce the dielectric loss of the capacitor, improve the reliability of operation, and meet the requirements of miniaturization of the capacitor. The nitrogen seal avoids oxidation and partial discharge of the electrode, ensures that the capacitor has excellent capacitance stability and long life, meets the higher requirements of miniaturization, and makes the capacitor assembly more convenient;

[0039] In this embodiment, the explosion-proof partition 9 arranged between the three groups of self-healing capacitor winding elements 8 serves as an explosion-proof partition. When one of the self-healing capacitor winding elements 8 fails or short-circuits, causing local overheating or even explosion, the deformable partition sheet 91 can expand and deform to cause the insulating fuse sleeve 911 to pull the fuse breaking point 631 to disconnect the single self-healing capacitor winding element 8, limit the energy, prevent it from spreading to other windings, reduce the risk of chain reaction, and make the capacitor safer.

[0040] Embodiment 2

[0041] See also Figures 1 to 16On the basis of the first embodiment, in order to make the capacitor produce double explosion-proof protection when the current is overloaded and the pressure is too large, the present embodiment further proposes that the connection output end of the triangular connection key 61 is provided with an electric connection ring 611, and the inner side of the electric connection ring 611 is symmetrically and movably installed with a second connection pin 612, and a conductive gasket 613 is fixedly installed below one end of the second connection pin 612, and an insulating gasket 614 is fixedly installed above one end of the second connection pin 612, and an electrical connection end 3 is fixedly installed in the middle of the upper part of the top cover 2, and a connection pin 1 31 is fixedly installed at the lower end of the electrical connection end 3, and the lower end of the connection pin 1 31 is overlapped with the upper end of the second connection pin 612;

[0042] In this embodiment, the triangular connection key 61 installed on the insulating fixing plate 6 is designed to be movably connected with the power ring 611, serving as a triangular connection key point between the electrical connection terminal 3 and the self-healing capacitor winding element 8. The triangular connection key 61 is provided with a discharge resistor 62 to ensure that the voltage at the capacitor terminal drops after the capacitor is powered off. The connecting wire 63 serves to connect the three groups of self-healing capacitor winding elements 8.

[0043] In this embodiment, the structure of the conductive gasket 613 and the second connecting pin 612 is a stacked N-type. When the current is overloaded, the current passing through the triangular connecting key 61 and the power ring 611 is overloaded. At this time, the conductive gasket 613 generates a certain expansion deformation due to heat, so that the bottom end of the second connecting pin 612 is tilted and separated from the connection with the first connecting pin 31, so that the capacitor is powered off. After the conductive gasket 613 cools down, the insulating gasket 614 is elastically deformed and reset, so that the bottom end of the conductive gasket 613 is reconnected with the first connecting pin 31, so that the capacitor is restored to the circuit. When the current is overloaded, the circuit is disconnected through physical deformation, thereby protecting the capacitor and other circuit components from damage, and the elastic recovery mechanism of the insulating gasket 614 and the conductive gasket 613 is used to make the capacitor self-recovering;

[0044] In this embodiment, when the self-healing capacitor winding element 8 breaks down multiple times above the triangular connecting key 61 to generate high temperature and high pressure, the top cover 2 is pushed up by the pressure to release the top of the capacitor, thereby achieving the purpose of pressure release and preventing bursting. The heat dissipation hole 21 can release pressure and dissipate heat. At the same time, the connection between the connecting pin 31 and the connecting ring 611 is also broken due to the rise of the top cover 2, which effectively blocks the flow of current and prevents the capacitor from exploding due to overload and overheating.

[0045] Embodiment 3

[0046] See also Figures 1 to 16On the basis of the second embodiment, in order to allow the top cover 2 to be reset after being lifted, the present embodiment further proposes that the surface of the top cover 2 is evenly distributed with heat dissipation holes 21, the lower surface of the top cover 2 is fixedly installed with an inner folding plate 22, the inner side of the inner folding plate 22 is provided with a sealing column 23, the upper end of the sealing column 23 is fixedly installed with an insulating sealing ball 231, the upper end of the insulating sealing ball 231 is in contact with the bottom of the heat dissipation hole 21, the lower surface of the insulating sealing ball 231 is fixedly installed with an extruded C-shaped piece 232, the inner folding plate 22 is an inner folded circular circle, the inner wall of one side of the inner folding plate 22 is clamped with the side wall of the sealing column 23, the side wall of the sealing column 23 is provided with a sliding groove, and the lower end of the extruded C-shaped piece 232 is fixedly connected with the upper part of the inner surface of the sealing column 23;

[0047] In this embodiment, the heat dissipation hole 21 is blocked by the insulating sealing ball 231 when the top cover 2 is in a normal state, so as to maintain the sealed state inside the top cover 2. The inner folding plate 22 not only forms a double-layer corrugated pressure relief and explosion-proof structure with the top cover 2, but also slides inside the sealing column 23 to squeeze the C-shaped sheet 232 to press the inner side of the inner folding plate 22. After the top cover 2 is lifted up to relieve the pressure, the C-shaped sheet 232 is squeezed to reset and can squeeze the inner folding plate 22 downward to reset the inner folding plate 22, thereby resetting the top cover 2, so that the connecting pin 1 31 is restored to overlap with the connecting pin 2 612, and the capacitor is restored to the usable state.

[0048] Embodiment 4

[0049] See also Figures 1 to 16 Based on the fifth embodiment, this embodiment further proposes a method for using a dry self-healing high-voltage power capacitor, comprising the following steps:

[0050] Step 1: In normal use, the electrical connection terminal 3 is connected to the external circuit, the triangular connection key 61 and the electrical connection ring 611 form a connection unit, and the self-healing capacitor winding element 8 is connected to the electrical connection terminal 3 through the connecting wire 63, providing capacitive reactive power in the high-voltage power system to offset the inductive reactive power generated by the load.

[0051] Step 2: When the overvoltage safety state is reached, the self-healing capacitor winding element 8 above the triangular connection key 61 is repeatedly broken down to generate high temperature and high pressure, and the top cover 2 is pushed upward by the pressure to release the pressure, and the connection between the connecting pin 1 31 and the connecting ring 611 is also broken due to the rise of the top cover 2, thereby preventing the capacitor from exploding due to overvoltage and overheating;

[0052] Step three, in the overload safety state, when one of the self-healing capacitor winding elements 8 fails or short-circuits, causing local overheating or even explosion, the deformable partition plate 91 can expand and deform to cause the insulating fuse sleeve 911 to pull the fuse break point 631 to disconnect the single self-healing capacitor winding element 8. At the same time, when the current is overloaded, the current passing through the triangular connecting key 61 and the power ring 611 is overloaded. At this time, the conductive gasket 613 expands and deforms to a certain extent due to heat, causing the bottom end of the connecting pin 2 612 to be lifted up and separated from the overlap with the connecting pin 1 31, so that the capacitor is powered off, thereby protecting the capacitor and other circuit components from damage. After the conductive gasket 613 cools down, the insulating gasket 614 is elastically deformed and reset, so that the bottom end of the conductive gasket 613 is re-connected with the connecting pin 1 31, so that the capacitor resumes the circuit.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dry self-healing high-voltage power capacitor, comprising a capacitor circular aluminum can (1), characterized in that: The upper end of the circular aluminum can (1) of the capacitor is provided with a top cover (2), the bottom of the circular aluminum can (1) of the capacitor is provided with a sealed bottom cover (4), the inner side of the circular aluminum can (1) of the capacitor is provided with an inner sealing sleeve (5), an insulating fixing plate (6) is provided above the inner side wall of the inner sealing sleeve (5), the interior of the inner sealing sleeve (5) is filled with nitrogen, a self-healing capacitor winding element (8) is provided in the middle of the inner sealing sleeve (5), the upper and lower ends of the self-healing capacitor winding element (8) are provided with electrode lead-out points (81), an explosion-proof partition (9) is provided between the self-healing capacitor winding elements (8), the interior of the explosion-proof partition (9) is evenly distributed with deformable partition sheets (91), the interior of the deformable partition sheet (91) is fixedly installed with an insulating sleeve (911), and the middle of the insulating fixing plate (6) is fixedly installed with three An angle connection key (61), one side of the triangle connection key (61) is electrically connected to a discharge resistor (62), a connection wire (63) is fixedly installed at the connection input end of the triangle connection key (61), the connection wire (63) is electrically connected to the electrode lead-out point (81), a fuse break point (631) is arranged near the middle of the insulating fuse sleeve (911) of the connection wire (63), the insulating fuse sleeve (911) is sleeved on the outer surface of one side of the fuse break point (631), a connection output end of the triangle connection key (61) is provided with an electric connection ring (611), a connection pin 2 (612) is symmetrically and movably installed on the inner side of the electric connection ring (611), a conductive gasket (613) is fixedly installed below one end of the connection pin 2 (612), and an insulating gasket (614) is fixedly installed above one end of the connection pin 2 (612).

2. A dry self-healing high-voltage power capacitor according to claim 1, characterized in that: The self-healing capacitor winding elements (8) are provided in three groups, the three groups of the self-healing capacitor winding elements (8) are vertically stacked and placed inside the inner sealing sleeve (5), and the outsides of the three groups of the self-healing capacitor winding elements (8) are all covered with high-temperature ceramic protective sleeves (7).

3. A dry self-healing high-voltage power capacitor according to claim 1, characterized in that: The explosion-proof partition (9) is fixedly mounted on the side wall of the inner sealing sleeve (5).

4. A dry self-healing high-voltage power capacitor according to claim 1, characterized in that: An electrical connection end (3) is fixedly mounted in the middle of the upper portion of the top cover (2), a connection pin 1 (31) is fixedly mounted at the lower end of the electrical connection end (3), and the lower end of the connection pin 1 (31) overlaps the upper end of the connection pin 2 (612).

5. A dry self-healing high-voltage power capacitor according to claim 4, characterized in that: The surface of the top cover (2) is evenly distributed with heat dissipation holes (21); an inner folding plate (22) is fixedly mounted on the lower surface of the top cover (2); and a sealing column (23) is arranged on the inner side of the inner folding plate (22).

6. A dry self-healing high-voltage power capacitor according to claim 5, characterized in that: An insulating sealing ball (231) is fixedly mounted on the upper end of the sealing column (23), the upper end of the insulating sealing ball (231) is in contact with the bottom of the heat dissipation hole (21), and an extruded C-shaped sheet (232) is fixedly mounted on the lower surface of the insulating sealing ball (231).

7. A dry self-healing high-voltage power capacitor according to claim 6, characterized in that: The inner folding plate (22) is an inner folding circular ring, an inner wall of one side of the inner folding plate (22) is clamped with a side wall of the sealing column (23), a sliding groove is provided on the side wall of the sealing column (23), and the lower end of the extruded C-shaped sheet (232) is fixedly connected to the upper inner surface of the sealing column (23).

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