10KV sulfur hexafluoride switch cabinet

Abstract

The invention discloses a 10KV sulfur hexafluoride switch cabinet which comprises a cabinet body, a gas box is arranged in the cabinet body, a mechanism chamber is arranged on the gas box, an electric control chamber is arranged on the mechanism chamber, an operating mechanism is arranged in the mechanism chamber, a three-phase high-voltage switch assembly is arranged in the gas box, and the three-phase high-voltage switch assembly is connected with the operating mechanism. A wire inlet sleeve and a wire outlet sleeve which are matched with each phase of high-voltage switch assembly are arranged on the gas box, the wire inlet sleeve is arranged on the gas box in an inverted mode, a first cylindrical contact is fixedly arranged in the wire inlet sleeve in a sleeved mode, copper-tungsten alloy of a spiral structure is embedded in the inner circumferential wall of the first cylindrical contact, a copper wire inlet rod is vertically inserted in the first cylindrical contact, and a wire outlet rod is arranged on the wire inlet sleeve. A heat dissipation box is arranged at the upper end of the gas box, a pressure relief device is arranged at the upper end of the heat dissipation box, the heat dissipation box and the gas box are internally communicated to form a closed cavity, the closed cavity is filled with sulfur hexafluoride gas, an inflation and measurement integrated pressure gauge is mounted on the gas box, and heat dissipation fins are paved on the outer surfaces of the gas box and the heat dissipation box. The heating value can be reduced, efficient heat dissipation is achieved, and the reliability of the switch cabinet is improved.

Description

Technical Field

[0001] The present invention relates to the field of electrical equipment, and more specifically, to a 10KV sulfur hexafluoride switch cabinet. Background Art

[0002] In today's 10kV power systems, switchgear plays a vital role, controlling, protecting, and isolating circuits. Common types of switchgear include air-insulated switchgear, vacuum switchgear, and sulfur hexafluoride switchgear.

[0003] While existing SF6 switchgear utilizes the excellent insulation and arc-extinguishing properties of SF6 gas to reduce its size to a certain extent, it still presents the following issues when operating at a high current of 3150A at a 10kV voltage level: The high current generates a significant amount of heat, which traditional heat dissipation methods struggle to dissipate efficiently, easily causing excessive temperatures inside the switchgear, impacting the performance and lifespan of electrical components and potentially posing safety hazards, such as performance degradation caused by SF6 gas at high temperatures. During high-current switching, factors such as contact resistance and electrokinetic repulsion can affect contact stability and service life. Existing contact structures can suffer from poor contact and prolonged arcing times, hindering the reliable operation of the switchgear. SF6 gas may leak minute amounts over long-term use, but existing monitoring devices are often insufficiently sensitive and cannot detect leaks promptly and accurately. Furthermore, there is a lack of convenient and effective gas replenishment devices, impacting the long-term stability of the switchgear's insulation and arc-extinguishing performance. Summary of the Invention

[0004] In order to solve the technical problems existing in the existing sulfur hexafluoride switchgear in the background technology, the present invention innovatively provides a 10KV sulfur hexafluoride switchgear, which can reduce heat generation, achieve efficient heat dissipation, and improve the reliability of the switchgear.

[0005] In order to achieve the above technical objectives, the embodiment of the present invention discloses a 10KV sulfur hexafluoride switchgear, including a cabinet body, a gas box is provided in the cabinet body, a mechanism room is provided on the front side of the gas box, an electric control room is provided on the upper side of the mechanism room, an operating mechanism is provided in the mechanism room, a three-phase high-voltage switch assembly is provided in the gas box, the three-phase high-voltage switch assembly is connected to the operating structure, and an inlet bushing and an outlet bushing that match each phase high-voltage switch assembly are provided on the gas box, the inlet bushing is inverted and arranged in the middle of the rear end of the gas box, and the inlet bushing is provided at the bottom of the gas box. A first tubular contact is provided in the inner fixed sleeve, and a copper-tungsten alloy with a spiral structure is embedded on the inner circumferential wall of the first tubular contact. A copper wire rod is vertically inserted into the first tubular contact. A heat sink is provided at the upper end of the air box, and a pressure relief device is provided at the upper end of the heat sink. The heat sink and the air box are connected to form a closed cavity, and the closed cavity is filled with sulfur hexafluoride gas. A charging and measuring integrated pressure gauge is installed on the air box, and the charging and measuring integrated pressure gauge is used to detect the pressure in the air box and replenish air into the air box. The outer surfaces of the air box and the heat sink are covered with heat sinks.

[0006] Furthermore, the present invention provides a 10KV sulfur hexafluoride switchgear, wherein thermal conductive silicone grease is applied between the heat sink and the gas box and the heat sink, and a black radiation heat absorption coating is applied on the heat sink, and the emissivity of the radiation heat absorption coating is higher than 0.9.

[0007] Furthermore, the present invention provides a 10KV sulfur hexafluoride switchgear, wherein the gas box includes a gas box upper plate, a gas box lower plate, a gas box left plate, a gas box right plate, a gas box front plate and a gas box rear plate, the gas box upper plate, the gas box lower plate, the gas box left plate, the gas box right plate, the gas box front plate and the gas box rear plate are interconnected to form a box structure, the upper half of the gas box rear plate is forwardly approached to the gas box front plate through a horizontal plate, the outlet bushing is installed on the gas box left plate, the incoming bushing is invertedly installed on the horizontal plate, the gas box upper plate is provided with heat dissipation holes, and the heat dissipation box is installed on the gas box upper plate and covers the heat dissipation holes.

[0008] Furthermore, the present invention provides a 10KV sulfur hexafluoride switchgear, wherein each phase high-voltage switch assembly includes an upper busbar, a branch busbar, a static contact seat, an isolating knife, a knife seat, a circuit breaker pole and a lower busbar, the upper busbar is connected to the outlet bushing, one end of the branch busbar is connected to the upper busbar, and the other end of the branch busbar is connected to the static contact seat, the static contact seat and the knife seat are coaxially arranged, the isolating knife is rod-shaped, the isolating knife and the knife seat are slidingly arranged, the isolating knife and the knife seat are plugged into each other, a second cylindrical contact is provided in the knife seat, and a copper-tungsten alloy with a spiral structure is embedded on the inner circumferential wall of the second cylindrical contact, the knife seat is fixed to the outlet end of the circuit breaker pole, one end of the lower busbar is connected to the incoming end of the circuit breaker pole, and the other end of the lower busbar is connected to the incoming bushing.

[0009] Furthermore, the present invention provides a 10KV sulfur hexafluoride switchgear, wherein a paralleling bushing corresponding one-to-one to the outlet bushing on the left plate of the gas box is provided on the right plate of the gas box, and the upper busbar includes three upper busbar bars, which are fixed between the outlet bushing and the paralleling bushing at intervals along the front-to-back direction, a third tubular contact is provided in the outlet bushing, and a fourth tubular contact is provided in the paralleling bushing, and a copper-tungsten alloy with a spiral structure is embedded on the inner circumferential walls of the third tubular contact and the fourth tubular contact.

[0010] Furthermore, the present invention provides a 10KV sulfur hexafluoride switchgear, wherein the branch busbar includes three branch busbar bars arranged in the up and down directions, the three branch busbar bars are arranged with a front-to-back interval between each other, the upper ends of the three branch busbar bars are fixedly connected to the three upper busbar bars in a one-to-one correspondence, and the upper ends of the three branch busbar bars are all fixedly connected to the static contact seat.

[0011] Furthermore, the present invention provides a 10KV sulfur hexafluoride switchgear, wherein the knife seat and the circuit breaker pole are both horizontally fixed on the front plate of the gas box in the front-to-back direction, the knife seat is located above the circuit breaker pole, and a fixing frame is fixed on the rear plate of the gas box behind the knife seat. The static contact seat is fixed on the fixing frame through an insulator, and a plurality of heat dissipation plates are provided between the insulator and the static contact seat, and the plurality of heat dissipation plates are coaxially arranged at intervals in the front-to-back direction.

[0012] Furthermore, the present invention provides a 10KV sulfur hexafluoride switchgear, wherein the lower busbar includes three lower busbar bars arranged along the front-to-back direction, the three lower busbar bars are spaced apart in the left-to-right direction, the incoming end of the circuit breaker pole faces the rear plate of the gas box, a conductive block is fixed on the incoming end of the circuit breaker pole, the front ends of the three lower busbar bars are fixedly connected to the conductive blocks, and the rear ends of the three lower busbar bars are fixedly connected to the incoming bushings.

[0013] Furthermore, the present invention provides a 10KV sulfur hexafluoride switch cabinet, wherein the knife seat, static contact seat and lower busbar are all provided with heat sinks, and thermal grease is applied between the heat sink and the knife seat, static contact seat and lower busbar, and the thermal conductivity coefficient of the thermal grease is not less than 3.

[0014] Furthermore, the present invention provides a 10KV sulfur hexafluoride switch cabinet, wherein the pressure relief device includes a flange, a metal diaphragm, a rupture ring and a pressure ring, a pressure relief hole is provided on the heat sink, the flange is fixed to the heat sink by nailing, the flange is coaxial with the pressure relief hole, a sealing ring is provided between the flange and the heat sink, the metal diaphragm and the rupture ring are pressed against the flange by the pressure ring, the metal diaphragm is recessed toward the interior of the heat sink, the rupture ring is located above the metal diaphragm, and the inner ring of the rupture ring is provided with a circle of barbs inclined toward the metal diaphragm.

[0015] The difference between the present invention and the prior art is that the present invention embeds a copper-tungsten alloy with a spiral structure on the inner wall of the first tubular contact in the outlet bushing, thereby improving the arc erosion resistance and mechanical strength of the contact, being able to withstand the high temperature and arc shock generated when large currents are switched on and off, and ensuring the stability and reliability of the contact under long-term high-current working conditions. The use of copper-made inlet rods can effectively reduce the resistance loss when large currents pass through, reduce heat generation, and thus adapt to large current transmission. The outer surfaces of the air box and the heat dissipation box are covered with heat sinks, which increases the heat dissipation area. Heat is generated when a large current passes through, and the heat sinks can quickly dissipate the heat in the air box and the heat dissipation box to the surrounding environment, reducing the temperature of the equipment, preventing overheating from affecting the performance and safety of the equipment, and ensuring that the equipment can remain within the normal operating temperature range when operating at high currents. Sulfur hexafluoride gas has good insulation and arc extinguishing properties, and its density is high, so it can carry a larger current under the same volume. At the same time, it also has excellent heat dissipation performance. When high current generates heat, it can transfer heat to the walls of the gas box and heat sink through gas convection and heat conduction. The heat is then dissipated by the heat sink, helping to maintain the temperature of the equipment stable and adapt to high-current operation. By installing a pressure relief device on the top of the heat sink, when the pressure in the closed cavity increases due to temperature changes or other reasons, the pressure relief device can promptly release the pressure, preventing damage to the cavity due to excessive pressure. It also protects the three-phase high-voltage switch components in the gas box and avoids safety accidents caused by abnormal pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of a 10KV sulfur hexafluoride switchgear according to the present invention;

[0017] Figure 2 Schematic diagram of the three-dimensional structure of the gas box in a 10KV sulfur hexafluoride switch cabinet of the present invention

[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of a gas box in a 10KV sulfur hexafluoride switchgear according to the present invention from another angle;

[0019] Figure 4 For Figure 2 On the basis of the above, the schematic diagram of the three-dimensional structure of the air box in the left plate of the air box is hidden;

[0020] Figure 5 This is a left-side structural schematic diagram of a gas box in a 10KV sulfur hexafluoride switchgear according to the present invention (the left plate of the gas box is omitted);

[0021] Figure 6 This is a schematic cross-sectional structural diagram of an incoming bushing in a 10KV sulfur hexafluoride switchgear according to the present invention;

[0022] Figure 7This is a schematic cross-sectional view of a static contact seat in a 10KV sulfur hexafluoride switchgear according to the present invention;

[0023] Figure 8 This is a schematic cross-sectional view of an outlet bushing in a 10KV sulfur hexafluoride switchgear according to the present invention;

[0024] Figure 9 This is a schematic diagram of the three-dimensional structure of a 10KV sulfur hexafluoride switchgear in the present invention, with the three-phase high-voltage switch assembly, the heat sink and the left plate of the gas box hidden;

[0025] Figure 10 The figure is a schematic cross-sectional view of a pressure relief device in a 10KV sulfur hexafluoride switchgear according to the present invention. DETAILED DESCRIPTION

[0026] The following is a detailed explanation and description of a 10KV sulfur hexafluoride switchgear of the present invention in conjunction with the accompanying drawings.

[0027] like Figure 1As shown, an embodiment of the present invention discloses a 10KV sulfur hexafluoride switchgear, comprising a cabinet body 10, within which is housed a gas box 1. A mechanism chamber 20 is located on the front side of the gas box 1, and an electrical control chamber 30 is located above the mechanism chamber 20. An operating mechanism is located within the mechanism chamber 20. A three-phase high-voltage switch assembly 2 is located within the gas box 1, and the three-phase high-voltage switch assembly 2 is connected to the operating mechanism, which operates the high-voltage switch assembly. The gas box 1 is provided with an incoming line bushing 3 and an outgoing line bushing 4, each matching each phase of the high-voltage switch assembly. The incoming line bushing 3 is inverted and positioned in the middle of the rear end of the gas box 1. A first cylindrical contact 31 is fixedly sleeved within the incoming line bushing 3. A copper-tungsten alloy with a spiral structure is embedded in the inner circumferential wall of the first cylindrical contact 31. The copper-tungsten alloy improves the contact's arc erosion resistance and mechanical strength, enabling it to withstand the high temperatures and arc shocks generated during high current switching, thereby ensuring the stability and reliability of the first cylindrical contact 31 under long-term high-current operating conditions. The spiral structure increases the contact area of the first tubular contact 31. During the opening and closing process, the spiral structure produces a self-cleaning effect, reducing poor contact caused by oxide films and impurities on the surface of the first tubular contact 31, thereby improving the stability and service life of the first tubular contact 31. A copper inlet rod 40 is vertically inserted into the first tubular contact 31. This copper inlet rod 40 effectively reduces resistance loss and heat generation when high currents pass through it, thereby accommodating high current transmission. A heat sink 5 is provided at the upper end of the air box 1, which efficiently dissipates heat from the bottom to the top of the air box 1. A pressure relief device 6 is also provided at the upper end of the box. By providing this device, when the pressure in the sealed cavity increases due to temperature changes or other factors, the device can promptly release the pressure, preventing damage to the cavity due to excessive pressure. This protects the three-phase high-voltage switch assembly 2 within the air box 1 and prevents safety accidents caused by abnormal pressure. The heat dissipation box 5 and the gas box 1 are internally connected to form a closed cavity, which is filled with sulfur hexafluoride gas. Sulfur hexafluoride gas has good insulation and arc extinguishing properties, and its density is high, so it can carry a larger current under the same volume. At the same time, it also has good heat dissipation performance. When a large current generates heat, it can transfer the heat to the wall of the gas box 1 and the heat dissipation box 5 through gas convection and heat conduction, and then dissipate it through the heat sink 7, which helps to maintain the temperature stability of the equipment and adapt to high current operation. The outer surfaces of the gas box 1 and the heat dissipation box 5 are covered with heat sinks 7. The heat sink 7 can increase the heat dissipation area. When a large current passes through, heat is generated. The heat sink 7 can quickly dissipate the heat in the gas box 1 and the heat dissipation box 5 to the surrounding environment, reducing the temperature inside the switch cabinet, preventing overheating from affecting the performance and safety of the equipment, and ensuring that the equipment can remain within the normal operating temperature range when operating at high current.

[0028] In one embodiment of the present invention, thermal grease is applied between the heat sink 7, the air box 1, and the heat sink 5, effectively improving heat conduction efficiency and allowing heat to be transferred more quickly to the surface of the heat sink 7. The heat sink 7 is coated with a black radiation-absorbing heat-absorbing coating with an emissivity greater than 0.9. According to the Stefan-Boltzmann law, the air box, as a heat source, can be enhanced by the high-emissivity coating due to the heat radiation effect, allowing the air box to dissipate more heat per unit time, thereby effectively reducing the temperature of the equipment, ensuring the stable operation of the three-phase high-voltage switch assembly 2 in a suitable temperature environment, and improving the reliability and service life of the air box and the equipment inside the air box.

[0029] In one embodiment of the present invention, an air box 1 includes an upper plate 11, a lower plate 12, a left plate 13, a right plate 14, a front plate 15, and a rear plate 16. These plates are interconnected to form a box structure. These plates are constructed of 3.0 mm thick stainless steel. Reinforcing ribs 9 are fixed to the inner surfaces of these plates, increasing the strength of the air box 1 and enabling its use even at high altitudes. The upper half of the airbox rear plate 16 is brought forward to the airbox front plate 15 via a horizontal plate 17, thereby reducing the volume of the airbox. The outlet bushing 4 is mounted on the airbox left plate 13, and the inlet bushing 3 is mounted in an inverted position on the horizontal plate 17. When installing the high-voltage busbar, the high-voltage busbar only needs to be vertically inserted into the inverted outlet bushing 4, making rational use of space. The airbox upper plate 11 is provided with heat dissipation holes 111. The heat dissipation box 5 is mounted on the airbox upper plate 11 and covers the heat dissipation holes 111. The heat dissipation holes 111 should be as large as possible when set, so that the heat generated in the airbox 1 can be quickly dissipated into the heat dissipation box 5, thereby meeting the heat dissipation requirements in high-current usage scenarios.

[0030] In one embodiment of the present invention, each phase high-voltage switch assembly includes an upper busbar 21, a branch busbar 22, a static contact seat 23, an isolating knife 24, a knife seat 25, a circuit breaker pole 26, and a lower busbar 27. The upper busbar 21 is connected to the outlet bushing 4, one end of the branch busbar 22 is connected to the upper busbar 21, and the other end of the branch busbar 22 is connected to the static contact seat 23. The static contact seat 23 and the knife seat 25 are coaxially arranged. The isolating knife 24 is rod-shaped and slides with the knife seat 25. The isolating knife 24 and the knife seat 25 are plugged into each other. A second cylindrical contact 231 is provided in the static contact seat 23. The inner circumferential wall of the second cylindrical contact 231 is embedded with a copper-tungsten alloy with a spiral structure. The copper-tungsten alloy has high conductivity, a high melting point, and excellent oxidation resistance, which can reduce contact resistance and reduce heat generation when large currents pass through. The spiral structure increases the contact area of the second tubular contact 231. During the opening and closing process, the spiral structure can produce a self-cleaning effect, reducing poor contact caused by oxide films and impurities on the surface of the second tubular contact 231. This improves the stability and service life of the second tubular contact 231, reduces the number of switchgear repairs and replacements due to failures of the second tubular contact 231, and reduces operation and maintenance costs. The knife block 25 and the circuit breaker pole 26 are both horizontally fixed to the gas box front plate 15 in the front-to-back direction. The knife block 25 is located above the circuit breaker pole 26. A fixing bracket 18 is fixed to the gas box rear plate 16 behind the knife block 25. The static contact seat 23 is fixed to the fixing bracket 18 via an insulator 28. A plurality of heat sinks 29 are provided between the insulator 28 and the static contact seat 23. The plurality of heat sinks 29 are coaxially arranged in a front-to-back spacing. The heat sinks 29 can effectively dissipate the heat generated by the static contact seat 23. The isolating knife 24 is driven by the isolating operating mechanism on the outside of the gas box 1 to move linearly in the forward and backward directions, thereby realizing the three-position operation of the isolating knife 24. The knife holder 25 is fixed to the outgoing end of the circuit breaker pole 26, one end of the lower busbar 27 is connected to the incoming end of the circuit breaker pole 26, and the other end of the lower busbar 27 is connected to the incoming bushing 3. The isolating knife 24 is installed in a direct-acting manner, and there will be no problems such as poor surface contact of the isolating knife 24, insufficient contact pressure, and small effective contact area. Therefore, the problem of increased heat generation due to increased contact resistance can be effectively avoided. The circuit breaker pole 26 is driven by the circuit breaker operating mechanism on the outside of the gas box 1 to open and close the internal vacuum interrupter, thereby completing the connection and disconnection between the circuit breaker pole 26 and the high-voltage incoming line.

[0031] The operating mechanism includes an isolating operating mechanism and a circuit breaker operating mechanism. The isolating operating mechanism is connected to the isolating knife, which drives the isolating knife 24 to move forward and backward within the knife holder 25, achieving a three-position operation of the isolating knife. The circuit breaker operating mechanism is connected to the circuit breaker pole 26. The circuit breaker operating mechanism pushes and pulls the movable conductive rod of the vacuum interrupter inside the circuit breaker pole 26, causing it to open and close.

[0032] In one embodiment of the present invention, a paralleling bushing 8 is provided on the right plate 14 of the gas box, corresponding one-to-one with the outlet bushing 4 on the left plate 13 of the gas box. The upper busbar 21 includes three upper busbar bars, which are fixed between the outlet bushing 4 and the paralleling bushing 8 at intervals along the front-to-back direction. The outlet bushing 4 and the paralleling bushing 8 can support the upper busbar bar. By providing the outlet bushing 4 and the paralleling bushing 8, connection interfaces for external power transmission can be provided on the left and right sides of the gas box 1, making cabinet merging or power distribution more convenient. The upper busbar 21 is composed of three upper busbar bars, which can increase the heat dissipation area of the upper busbar 21 and improve the heat dissipation effect. A third tubular contact 41 is installed within the outlet bushing 4, and a fourth tubular contact is installed within the paralleling bushing 8. Both the third and fourth tubular contacts are embedded with a copper-tungsten alloy with a spiral structure on their inner circumferences. Copper-tungsten alloy has high conductivity, a high melting point, and excellent oxidation resistance, which reduces contact resistance and reduces heat generation when high currents flow through it. The spiral structure increases the contact area and, during the opening and closing process, creates a self-cleaning effect, reducing contact defects caused by oxide films and impurities on the contact surface. This improves contact stability and service life, reduces the number of switchgear repairs and replacements due to contact failures, and reduces operational costs.

[0033] The branch busbar 22 includes three branch busbars arranged in the up-down direction. The three branch busbars are spaced apart from each other in front and back. Compared with closely arranging the three branch busbars, the contact area between the branch busbars and the surrounding air is increased. The larger contact area is conducive to the heat being dissipated into the surrounding air through heat conduction and heat convection, thereby improving the heat dissipation efficiency. The branch busbars arranged at intervals allow air to form channels between the branch busbars, which is conducive to air circulation. When hot air is generated around the branch busbars, it can be replaced by cold air in time through these channels, forming a good convection heat dissipation environment. This air flow can continuously take away the heat dissipated by the branch busbars, avoid local accumulation of heat, and further improve the heat dissipation effect. The upper ends of the three branch busbars are fixedly connected to the three upper busbars in a one-to-one correspondence, and the upper ends of the three branch busbars are fixedly connected to the static contact seat 23, so that the heat can be distributed more evenly in the vertical direction. The fixed connection with the static contact seat 23 also helps to transfer the heat generated by the branch busbar to the static contact seat 23, and then further dissipate the heat through the static contact seat 23, or transfer the heat generated by the static contact seat 23 to the branch busbar, and then further dissipate the heat through the branch busbar, thereby achieving balanced heat dissipation and preventing local overheating.

[0034] Similarly, the lower busbar 27 includes three lower busbars arranged in the front-to-back direction. The three lower busbars are spaced apart in the left-to-right direction. The spacing between two adjacent lower busbars can be controlled by the thickness of the small busbars sandwiched between the two adjacent lower busbars. Compared with closely arranging the three lower busbars, the contact area between the lower busbars and the surrounding air is increased. The larger contact area is conducive to the dissipation of heat to the surrounding air through heat conduction and heat convection, thereby improving the heat dissipation efficiency. The spaced lower busbars allow air to form channels between the lower busbars, which is conducive to air circulation. When hot air is generated around the lower busbars, it can be replaced by cold air in a timely manner through these channels, forming a good convection heat dissipation environment. This air flow can continuously carry away the heat dissipated by the lower busbars, preventing heat from accumulating locally, and further improving the heat dissipation effect. The incoming end of the circuit breaker pole 26 faces the gas box rear plate 16. A conductive block 261 is fixed to the incoming end of the circuit breaker pole 26. The front ends of the three lower busbars are fixedly connected to the conductive block 261, and the rear ends of the three lower busbars are fixedly connected to the incoming bushing 3, so that the heat can be distributed more evenly in the horizontal direction. The fixed connection with the conductive block 261 and the incoming bushing 3 also helps to conduct the heat generated by the lower busbar to the conductive block 261 or the incoming bushing 3, and then further dissipate the heat through the conductive block 261 or the incoming bushing 3, or conduct the heat generated by the conductive block 261 or the incoming bushing 3 to the lower busbar, and then further dissipate the heat through the lower busbar, thereby achieving balanced heat dissipation and preventing local overheating.

[0035] To further enhance heat dissipation, in one embodiment of the present invention, heat sinks 7 are provided on the blade holder 25, the stationary contact holder 23, and the lower busbar 27. Thermally conductive silicone grease is applied between the heat sink 7 and the blade holder 25, the stationary contact holder 23, and the lower busbar 27, ensuring that the thermal conductivity of the thermal grease is no less than 3. Thermally conductive silicone grease has a high thermal conductivity and can effectively fill the tiny gaps between the heat sink 7 and the blade holder 25, the stationary contact holder 23, and the lower busbar 27, reducing thermal resistance. This allows the heat generated by these components to be transferred to the heat sink 7 more quickly and efficiently, creating favorable conditions for subsequent heat dissipation. The heat sink 7 itself has a large surface area, which increases the contact area with the air. Combined with the excellent thermal conductivity of the thermally conductive silicone grease, heat from the blade holder 25, the stationary contact holder 23, and the lower busbar 27 can be quickly transferred to the surface of the heat sink 7. This heat is then dissipated into the surrounding air through convection and radiation, thereby improving overall heat dissipation efficiency and reducing component temperatures. Through the synergistic effect of the heat sink 7 and the thermal grease, the temperature of these components can be effectively controlled, which helps to maintain the normal operation of the equipment, extend the service life of the equipment, and improve the reliability and stability of the equipment.

[0036] In one embodiment of the present invention, the pressure relief device 6 includes a flange 61, a metal diaphragm 62, a rupture ring 63, and a pressure ring 64. A pressure relief hole 51 is provided on the heat sink 5. The flange 61 is fixed to the heat sink 5 by screws, so that the flange 61 and the pressure relief hole 51 are coaxially arranged. A sealing ring 65 is provided between the flange 61 and the heat sink 5. The metal diaphragm 62 and the rupture ring 63 are pressed against the flange 61 by the pressure ring 64. The metal diaphragm 62 is recessed toward the interior of the heat sink 5. The rupture ring 63 is located above the metal diaphragm 62. The inner ring of the rupture ring 63 is provided with a circle of barbs 631 that are inclined toward the metal diaphragm 62. When the pressure in the air box 1 is normal, the metal diaphragm 62 remains recessed toward the inside of the heat sink 5. When the pressure in the air box 1 exceeds a certain limit, the metal diaphragm 62 will bulge upward. At this time, the barbs 631 on the rupture ring 63 will puncture the metal diaphragm 62, ensuring that the pressure is released only when the pressure reaches a dangerous threshold, avoiding unnecessary pressure relief operations that interfere with the operation of the high-voltage switch assembly in the air box. By releasing excessive pressure in time, the air box 1 can be prevented from rupturing, exploding, and other serious hazards due to excessive pressure, thereby ensuring the safety of equipment and personnel.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0038] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and simple improvements made to the essential contents of the present invention should be included in the scope of protection of the present invention.

Claims

1. A 10KV sulfur hexafluoride switchgear, characterized by: The control cabinet of claim 1, wherein the control cabinet is provided with a gas box, the front side of the gas box is provided with a mechanism room, the upper side of the mechanism room is provided with an electric control room, the mechanism room is provided with an operating mechanism, the gas box is provided with a three-phase high-voltage switch assembly, the three-phase high-voltage switch assembly is connected to the operating structure, the gas box is provided with an inlet bushing and an outlet bushing that match each phase high-voltage switch assembly one by one, the inlet bushing is inverted and arranged in the middle of the rear end of the gas box, a first tubular contact is fixedly sleeved in the inlet bushing, a copper-tungsten alloy with a spiral structure is embedded on the inner circumferential wall of the first tubular contact, a copper inlet rod is vertically inserted in the first tubular contact, a heat sink is provided at the upper end of the gas box, a pressure relief device is provided at the upper end of the heat sink, the heat sink and the gas box are connected to form a closed cavity, the closed cavity is filled with sulfur hexafluoride gas, and a charging and measuring integrated pressure gauge is installed on the gas box, the charging and measuring integrated pressure gauge is used to detect the pressure in the gas box and replenish gas in the gas box, and the outer surfaces of the gas box and the heat sink are covered with heat sinks.

2. The 10KV sulfur hexafluoride switchgear according to claim 1, characterized in that: Thermal conductive silicone grease is applied between the heat sink and the air box and the heat sink, and a black radiation heat absorption coating is applied on the heat sink, wherein the emissivity of the radiation heat absorption coating is higher than 0.

9.

3. The 10KV sulfur hexafluoride switchgear according to claim 1, characterized in that: The air box includes an upper plate, a lower plate, a left plate, a right plate, a front plate and a rear plate. The upper plate, the lower plate, the left plate, the right plate, the front plate and the rear plate are connected to each other to form a box structure. The upper half of the rear plate is moved forward close to the front plate through a horizontal plate. The outlet bushing is installed on the left plate of the air box. The inlet bushing is installed in an inverted manner on the horizontal plate. The upper plate of the air box is provided with heat dissipation holes. The heat dissipation box is installed on the upper plate of the air box and covers the heat dissipation holes.

4. The 10KV sulfur hexafluoride switchgear according to claim 3, characterized in that: Each phase high-voltage switch assembly includes an upper busbar, a branch busbar, a static contact seat, an isolating knife, a knife seat, a circuit breaker pole and a lower busbar. The upper busbar is connected to the outlet bushing, one end of the branch busbar is connected to the upper busbar, and the other end of the branch busbar is connected to the static contact seat. The static contact seat and the knife seat are coaxially arranged. The isolating knife is rod-shaped, and the isolating knife and the knife seat are slidingly arranged. The isolating knife and the knife seat are plugged into each other. A second cylindrical contact is provided in the knife seat, and a copper-tungsten alloy with a spiral structure is embedded on the inner circumferential wall of the second cylindrical contact. The knife seat is fixed to the outlet end of the circuit breaker pole, one end of the lower busbar is connected to the incoming end of the circuit breaker pole, and the other end of the lower busbar is connected to the incoming bushing.

5. The 10KV sulfur hexafluoride switchgear according to claim 4, characterized in that: The right plate of the air box is provided with a parallel line sleeve corresponding to the outlet sleeve on the left plate of the air box. The upper busbar includes three upper busbar rows. The three upper busbar rows are fixed between the outlet sleeve and the parallel line sleeve at intervals along the front-to-back direction. A third tubular contact is provided in the outlet sleeve, and a fourth tubular contact is provided in the parallel line sleeve. The inner circumferential walls of the third tubular contact and the fourth tubular contact are both embedded with a copper-tungsten alloy with a spiral structure.

6. The 10KV sulfur hexafluoride switchgear according to claim 5, characterized in that: The branch busbar includes three branch busbars arranged in the up and down directions. The three branch busbars are arranged in a front-to-back spacing between each other. The upper ends of the three branch busbars are fixedly connected to the three upper busbars in a one-to-one correspondence. The upper ends of the three branch busbars are all fixedly connected to the static contact seat.

7. The 10KV sulfur hexafluoride switchgear according to claim 6, characterized in that: The knife seat and the circuit breaker pole are both horizontally fixed on the front plate of the gas box in the front-to-back direction. The knife seat is located above the circuit breaker pole. A fixing frame is fixed on the rear plate of the gas box behind the knife seat. The static contact seat is fixed on the fixing frame through an insulator. A plurality of heat dissipation plates are provided between the insulator and the static contact seat. The plurality of heat dissipation plates are coaxially arranged at intervals in the front-to-back direction.

8. The 10KV sulfur hexafluoride switchgear according to claim 7, characterized in that: The lower busbar includes three lower busbar bars arranged along the front-to-back direction, and the three lower busbar bars are arranged at intervals in the left-to-right direction. The incoming end of the circuit breaker pole faces the rear plate of the gas box, and a conductive block is fixed on the incoming end of the circuit breaker pole. The front ends of the three lower busbar bars are fixedly connected to the conductive blocks, and the rear ends of the three lower busbar bars are fixedly connected to the incoming bushings.

9. The 10KV sulfur hexafluoride switchgear according to claim 8, characterized in that: The knife seat, the static contact seat and the lower busbar are all provided with heat sinks, and thermal grease is applied between the heat sink and the knife seat, the static contact seat and the lower busbar. The thermal conductivity coefficient of the thermal grease is not less than 3.

10. The 10KV sulfur hexafluoride switchgear according to claim 9, characterized in that: The pressure relief device includes a flange, a metal diaphragm, a rupture ring and a pressure ring. A pressure relief hole is provided on the heat sink. The flange is fixed to the heat sink by nailing. The flange is coaxial with the pressure relief hole. A sealing ring is provided between the flange and the heat sink. The metal diaphragm and the rupture ring are pressed against the flange by the pressure ring. The metal diaphragm is recessed toward the interior of the heat sink. The rupture ring is located above the metal diaphragm. The inner ring of the rupture ring is provided with a circle of barbs inclined toward the metal diaphragm.

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