A 24kV high-altitude high-capacity high-voltage switchgear and operating method

Abstract

This invention relates to the field of high-altitude, high-capacity high-voltage switchgear technology, specifically to a 24kV high-altitude, high-capacity high-voltage switchgear and its operating method. The switchgear includes an armored cabinet, a high-altitude circuit breaker, a handcart interlocking unit, a high-altitude contact box, a busbar input unit, and a busbar output unit. By improving the high-altitude circuit breaker and the handcart interlocking unit, and by making the handcart interlocking unit insulated from the mounting plate, the creepage distance is increased, improving insulation performance and meeting the insulation performance requirements of high-voltage switchgear in high-altitude environments. This satisfies the needs of high-altitude use. Simultaneously, the armored cabinet makes the overall structure more compact, and installation and operation simpler and more convenient.

Description

Technical Field

[0001] This invention relates to the field of high-altitude, high-capacity high-voltage switch technology, specifically to a 24kV high-altitude, high-capacity high-voltage switchgear and its operating method. Background Technology

[0002] High-voltage switchgear is a critical control and protection device in the power system, and its operating status directly affects the stability and security of the power grid.

[0003] With the continuous increase in the capacity of power distribution, the market demand for 24kV high-voltage switchgear products is increasing year by year. However, since 24kV high-voltage switchgear can usually only be used at altitudes below 1000 meters, the insulation margin of the products is relatively low. With the continuous changes in the market and the continuous progress of technology, although the improved 24kV high-voltage switchgear can be used in areas with an altitude of about 2000 meters, its performance still has certain instability in actual tests at an altitude of 3000 meters, and it cannot meet the high insulation margin requirements of 24kV high-voltage switchgear in areas with an altitude of 3000 meters. Summary of the Invention

[0004] The purpose of this invention is to provide a 24kV high-altitude, high-capacity high-voltage switchgear and its operation method, thereby solving the technical problem that current 24kV high-voltage switchgear cannot meet the requirements for high-altitude use.

[0005] The solution of the present invention to the above-mentioned technical problems is as follows: A 24kV high-altitude, high-capacity high-voltage switchgear includes an armored cabinet, a high-altitude circuit breaker, a handcart interlocking unit, a high-altitude contact box, a busbar input unit, and a busbar output unit. The high-altitude circuit breaker is matched with the handcart interlocking unit. Both the high-altitude circuit breaker and the handcart interlocking unit are located in the handcart compartment of the armored cabinet. One end of the busbar input unit and the busbar output unit are located on the outside of the armored cabinet, and the other end of the busbar input unit and the busbar output unit are located in the busbar compartment of the armored cabinet. The armored cabinet is equipped with an installation plate located between the handcart compartment and the busbar compartment. The handcart interlocking unit is insulated from the installation plate. The high-altitude contact box is connected to the installation plate. The plug-in terminal of the high-altitude contact box extends into the handcart compartment and is opposite to the high-altitude circuit breaker. The wiring terminal of the high-altitude contact box extends into the busbar compartment. The wiring terminal of the high-altitude contact box is connected to the other end of the busbar input unit and the other end of the busbar output unit, respectively.

[0006] Further specifying, the high-altitude circuit breaker includes a high-altitude handcart, a high-altitude solid-sealed pole, a contact arm, and a spring mechanism; the contact arm includes an upper contact arm and a lower contact arm; The high-altitude solid-sealed pole is vertically installed in the horizontal movement section of the high-altitude handcart, and the spring mechanism is installed in the vertical panel section of the high-altitude handcart. The spring mechanism is connected to the high-altitude solid-sealed pole in a driving connection. The upper contact arm and the lower contact arm are both connected to the high-altitude solid-sealed pole in the horizontal direction, and the upper contact arm and the lower contact arm are both directly opposite the plug-in end of the high-altitude contact box.

[0007] Further specified, the high-altitude solid-sealing pole is provided with umbrella skirts and reinforcing ribs, and the bottom of the high-altitude solid-sealing pole is connected to the horizontal moving section of the high-altitude handcart via a connecting base plate; the number of umbrella skirts is 16, with 8 umbrella skirts between the upper and lower contact arms and between the lower contact arm and the connecting base plate; the reinforcing ribs are located on the back of the high-altitude solid-sealing pole; the outer diameter of the umbrella skirts is 200mm, and the inner diameter of the umbrella skirts is 160mm; the distance between the upper and lower contact arms is 360mm, and the distance between the lower contact arm and the bottom of the connecting base plate is 290mm; The depth of the handcart compartment is 995mm, and the travel of the handcart compartment is 310mm.

[0008] Further specified, the high-altitude solid-sealing pole is provided with an insulating tie rod inside, and an asymmetrical umbrella skirt assembly is provided between the insulating tie rod and the high-altitude solid-sealing pole; the high-altitude solid-sealing pole is made of high thermal conductivity epoxy resin material.

[0009] Further specified, the handcart interlocking unit includes a U-shaped valve, a valve interlocking mechanism, a valve slide groove, and a limiting post; The U-shaped valve is sleeved on the outside of the plug-in end of the high-altitude contact box. There are two valve slides, which are arranged on opposite sides of the mounting plate. The two ends of the U-shaped valve are respectively insulated and connected to the corresponding valve slides. The limiting post is arranged on the mounting plate to limit the movement distance of the U-shaped valve. The number of valve interlocking mechanisms is two, and the two valve interlocking mechanisms are respectively set on opposite sides of the handcart compartment. The movable end of the valve interlocking mechanism is connected to the handcart compartment, and the connecting end of the valve interlocking mechanism is connected to the U-shaped valve.

[0010] Further defined, the Z-shaped valve includes an upper valve, a lower valve, a Z-shaped connecting plate, and an insulating connecting plate; The left and right sides of the upper valve and the left and right sides of the lower valve are insulatedly connected to the valve slide groove through Z-shaped connecting plates and insulating connecting plates. The Z-shaped connecting plates are slidably connected to the valve slide groove through the insulating connecting plates. The insulating connecting plates are connected to the connecting end of the valve interlocking mechanism. The upper valve and the lower valve are both located outside the plug-in end of the high-altitude contact box. The limiting post is positioned between the upper and lower valves.

[0011] Further defined, the high-altitude contact box includes an upper contact box, an upper stationary contact, a lower contact box, and a lower stationary contact; The upper stationary contact is located inside the upper contact box, and the lower stationary contact is located inside the lower contact box; the other end of the busbar output unit extends through the wiring terminal of the upper contact box to the inside of the upper contact box and connects with the upper stationary contact; the other end of the busbar input unit extends through the wiring terminal of the lower contact box to the inside of the lower contact box and connects with the lower stationary contact. The wiring terminals of the upper contact box and the lower contact box are both located in the busbar compartment, and the plug-in terminals of the upper contact box and the lower contact box both extend through the mounting plate to the handcart compartment. The plug-in end of the upper contact box is opposite to the upper contact arm, and the plug-in end of the lower contact box is opposite to the lower contact arm. The distance between the plug-in ends of the upper and lower contact boxes and the mounting plate is 130mm. The distance between the plug-in end of the upper contact box and the upper valve and the distance between the plug-in end of the lower contact box and the lower valve are both 5mm.

[0012] Further defined, the busbar input unit includes an overhead busbar, a sensor, a lower branch, and a through-type current transformer; The upper end of the overhead busbar extends to the outside of the armored cabinet. The upper end of the overhead busbar is fitted with a heat shrink tubing. The upper end of the overhead busbar is connected to the armored cabinet through a busbar bushing. The overhead busbar is connected to the busbar compartment through a sensor. The lower end of the overhead busbar passes through a through-type current transformer and connects to one end of the lower branch. The sensor of the lower branch is connected to the mounting plate. The other end of the lower branch passes through the wiring terminal of the lower contact box and connects to the lower stationary contact. The busbar output unit includes a main busbar and an upper branch. The bottom end of the upper branch extends through the terminal block of the upper contact box and into the interior of the upper contact box to connect with the upper stationary contact. The upper branch is connected to the busbar chamber through an insulator. The upper end of the upper branch is connected to the corresponding main busbar. The main busbar extends to the outside of the armored cabinet and is connected to the armored cabinet through a busbar sleeve. A heat shrink tubing is fitted on the outside of the main busbar.

[0013] Further specifying, the 24kV high-altitude large-capacity high-voltage switchgear also includes a high-altitude heat exchange unit. The high-altitude heat exchange unit includes a crossflow fan, a first heat exchange fan, and a second heat exchange fan. The crossflow fan is installed in the lower front chamber of the armored cabinet. The lower front chamber is located below the handcart compartment and is connected to both the handcart compartment and the busbar compartment. The first and second heat exchange fans are both located at the top of the armored cabinet. The first heat exchange fan is connected to the handcart compartment, and the second heat exchange fan is connected to the busbar compartment.

[0014] An operation method for a 24kV high-altitude, high-capacity high-voltage switchgear, based on the aforementioned 24kV high-altitude, high-capacity high-voltage switchgear, includes the following steps: Start the crossflow fan to draw the cold air from outside the armored cabinet into the front lower chamber from the bottom of the armored cabinet. Then, the first heat exchange fan and the second heat exchange fan will dissipate heat to the handcart compartment and the busbar compartment, respectively. The high-altitude circuit breaker is jacked in from the truck compartment, and the high-altitude contact box is opened in cooperation with the truck interlocking unit, so that the high-altitude circuit breaker is connected to the high-altitude contact box. The high-altitude circuit breaker is spun out of the truck compartment and, with the cooperation of the truck interlocking unit, closes the high-altitude contact box, thus disconnecting the high-altitude circuit breaker from the high-altitude contact box.

[0015] The beneficial effects of this invention are as follows: 1. This invention improves the high-altitude circuit breaker and the handcart interlocking unit, and makes the handcart interlocking unit insulated from the mounting plate, thereby increasing the creepage distance and improving the insulation performance. This increases the creepage distance and meets the insulation performance requirements of high-voltage switching equipment in high-altitude environments, thus meeting the needs of high-altitude use. At the same time, in conjunction with the armored cabinet, the overall structure is more compact, and the installation and operation are simpler and more convenient.

[0016] 2. This invention increases the creepage distance and insulation performance by increasing the spacing between the upper and lower contact arms on the high-altitude solid-sealed pole, thus meeting the high-altitude creepage distance requirements; it also adds umbrella skirts to increase the creepage distance along the surface and improve insulation; at the same time, by setting an asymmetrical umbrella skirt group inside, the electric field distribution is optimized through the asymmetrical umbrella skirt group, increasing the effective creepage distance without changing the overall size; and the spring mechanism is set in front and behind the high-altitude solid-sealed pole, making the structure more compact, the action transmission response faster, and improving efficiency.

[0017] 3. This invention increases the distance between the upper and lower contact box plug-in ends and the mounting plate, effectively increasing the creepage distance of the live parts inside the high-altitude contact box to the mounting plate; at the same time, the Z-shaped connecting plate is used to realize the sliding connection between the upper and lower valves and the valve grooves on the mounting plate. The connection ensures that the upper / lower valves can be located at the front end of the upper / lower contact box plug-in ends, ensuring the reliable and stable operation of the upper and lower valves, while ensuring the insulation of the Z-shaped valve connection, increasing the creepage distance ratio, and further meeting the needs of use in high-altitude environments.

[0018] 4. This invention, by installing a crossflow fan on the armored cabinet, actively draws cold air from outside the armored cabinet into the lower front chamber of the armored cabinet from the bottom and blows it into the handcart chamber and busbar chamber respectively. Then, in conjunction with the first and second heat exchange fans, the heat generated during the operation of the armored cabinet is blown out from the top, realizing air circulation heat dissipation, improving the heat dissipation efficiency inside the armored cabinet, ensuring reliable heat dissipation in high-altitude and low-pressure environments, and further meeting the needs of use in high-altitude environments. Attached Figure Description

[0019] Figure 1This is a diagram of the internal structure of the 24kV high-altitude, high-capacity high-voltage switchgear of the present invention. Figure 2 This is a side view of the 24kV high-altitude, high-capacity high-voltage switchgear of the present invention. Figure 3 This is a schematic diagram of the high-altitude circuit breaker structure of the present invention; Figure 4 This is a schematic diagram of the high-altitude solid-sealed pole structure of the present invention; Figure 5 This is a schematic diagram of the handcart interlocking unit structure of the present invention; Figure 6 This is a top view of the handcart interlocking unit of the present invention; Figure 7 for Figure 6 Enlarged diagram of part A in the middle; Figure 8 This is a schematic diagram of the upper contact box structure of the present invention; Figure 9 This is a schematic diagram of the busbar bushing structure of the present invention; Figure 10 This is a schematic diagram of the insulator structure of the present invention.

[0020] In the diagram, 100-armored cabinet; 101-handcart compartment; 102-busbar compartment; 103-front lower compartment; 110-mounting plate; 120-busbar bushing; 130-insulator; 200-high-altitude circuit breaker; 210-high-altitude handcart; 220-high-altitude solid-sealed pole; 221-insulating tie rod; 222-asymmetric umbrella skirt assembly; 230-contact arm; 231-upper contact arm; 232-lower contact arm; 240-spring mechanism; 250-umbrella skirt; 260-connecting base plate; 270-reinforcing rib; 300-handcart interlocking unit; 310-U-shaped valve; 311-upper valve; 312- Lower valve; 313-Z-type connecting plate; 314-Insulating connecting plate; 320-Valve interlocking mechanism; 330-Valve slide rail; 340-Limiting post; 400-High altitude contact box; 410-Upper contact box; 420-Upper stationary contact; 430-Lower contact box; 440-Lower stationary contact; 500-Busbar input unit; 510-Overhead busbar; 520-Sensor; 530-Lower branch; 540-Through-type current transformer; 600-Busbar output unit; 610-Main busbar; 620-Upper branch; 700-Crossflow fan; 710-First heat exchanger fan; 720-Second heat exchanger fan. 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, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] Example 1 refer to Figures 1-10 This embodiment provides a 24kV high-altitude, high-capacity high-voltage switchgear, including an armored cabinet 100, a high-altitude circuit breaker 200, a handcart interlocking unit 300, a high-altitude contact box 400, a busbar input unit 500, and a busbar output unit 600. By improving the high-altitude circuit breaker 200, the handcart interlocking unit 300, and the high-altitude contact box 400, and optimizing the insulation of the busbar input unit 500 and the busbar output unit 600, the overall insulation margin of the product is improved, enabling it to meet the usage requirements of high-voltage switchgear at altitudes of 3000km.

[0023] To further explain, the 24kV high-altitude large-capacity high-voltage switchgear provided in this embodiment also includes a high-altitude heat exchange unit, which is used to actively exchange the heat generated by the 24kV high-altitude large-capacity high-voltage switchgear during operation with the low-temperature air outside, so as to realize the active heat dissipation of the high-voltage switchgear in the high-altitude low-pressure environment, improve heat dissipation efficiency, improve service life and reliability, and further meet the needs of use in high-altitude areas.

[0024] refer to Figure 1 and Figure 2 The armored cabinet 100 contains an installation plate 110, a truck compartment 101, a busbar compartment 102, and a front lower compartment 103. The front lower compartment 103 is connected to both the truck compartment 101 and the busbar compartment 102. The high-altitude circuit breaker 200 and the truck interlocking unit 300 are both located in the truck compartment 101. The high-altitude contact box 400 is mounted on the installation plate 110. The plug-in terminal of the high-altitude contact box 400 extends through the installation plate 110 into the truck compartment 101, and is used to connect and disconnect with the high-altitude circuit breaker 200 in cooperation with the truck interlocking unit 300. The wiring terminal of the high-altitude contact box 400 extends through the installation plate 110 into the busbar compartment 102. The busbar input unit 500 and the busbar output unit 600 are both connected to the high-altitude contact box 400.

[0025] At this time, one end of the busbar input unit 500 and one end of the busbar output unit 600 extend to the outside of the armored cabinet 100, while the other end of the busbar input unit 500 and the other end of the busbar output unit 600 are located inside the busbar compartment 102 and connected to the wiring of the high-altitude contact box 400.

[0026] refer to Figure 1 and Figure 2 The high-altitude heat exchange unit includes a crossflow fan 700, a first heat exchange fan 710, and a second heat exchange fan 720. Both the first heat exchange fan 710 and the second heat exchange fan 720 are installed on the top of the outer side of the armored cabinet 100. The first heat exchange fan 710 is connected to the handcart compartment 101, and the second heat exchange fan 720 is connected to the busbar compartment 102.

[0027] In actual use, after the crossflow fan 700 starts, it draws low-pressure cold air from outside the armored cabinet 100 into the front lower chamber 103 from the bottom of the armored cabinet 100, and then blows it into the handcart chamber 101 and busbar chamber 102 respectively, for heat exchange and cooling of the high-altitude circuit breaker 200, handcart interlocking unit 300, high-altitude contact box 400, busbar input unit 500 and busbar output unit 600 respectively. The air after heat exchange is discharged to the outside of the armored cabinet 100 through the first heat exchange fan 710 and the second heat exchange fan 720 respectively, thus achieving heat exchange. By establishing a heat exchange cycle, the air flow speed is increased, the heat dissipation efficiency is improved, and the heat dissipation requirements of the high-altitude low-pressure air environment are met.

[0028] For further explanation, please refer to Figures 1-5 The high-altitude circuit breaker 200 includes a high-altitude trolley 210, a high-altitude solid-sealed pole 220, a contact arm 230, and a spring mechanism 240. The high-altitude trolley 210 has an L-shaped structure and is connected to the trolley compartment 101 via a lead screw. The high-altitude trolley 210 can be rocked in or out by rotating the lead screw with a handle. The width of the horizontal moving section of the high-altitude trolley 210 is increased to 1100mm, the shape of the high-altitude trolley 210 is 310mm, and the depth of the trolley compartment 101 is 995mm, ensuring the reliability of the high-altitude trolley 210 rocking in and out.

[0029] Left / right sealing plates are preferably installed on both sides of the high-altitude handcart 210. By installing left / right sealing plates, the high-altitude handcart 210 can achieve an IP2X protection level at the test position.

[0030] The high-altitude solid-sealed pole 220 is installed vertically on the horizontal moving section of the high-altitude handcart 210. The high-altitude solid-sealed pole 220 is located between the mounting plate 110 and the vertical panel section of the high-altitude handcart 210. The contact arm 230 is vertically connected to the high-altitude solid-sealed pole 220 in the horizontal direction. The contact arm 230 faces the plug-in end of the high-altitude contact box 400 on the mounting plate 110. The handcart interlocking unit 300 is insulated from the mounting plate 110 and is sleeved on the outside of the plug-in end of the high-altitude contact box 400. The high-altitude handcart 210 is interlocked with the handcart interlocking unit 300. The spring mechanism 240 is set on the vertical panel section of the high-altitude handcart 210 and is drivenly connected to the high-altitude solid-sealed pole 220. It is used to realize the reliable breaking of the 4000A high-altitude circuit breaker 200 and meet the requirements of rated current of 4000A and rated short-circuit breaking of 40kA.

[0031] The spring mechanism features a 240 modular design, ensuring stable and reliable switching operation. Its output characteristics meet the 4800N contact pressure of the circuit breaker's arc-extinguishing chamber. The structure is compact, and the operation is stable and reliable.

[0032] For details, please refer to Figure 3 and Figure 4 The high-altitude solid-sealing pole 220 is provided with a skirt 250 and a reinforcing rib 270. The contact arm 230 includes an upper contact arm 231 and a lower contact arm 232. The upper contact arm 231 is located above the lower contact arm 232. Both the upper contact arm 231 and the lower contact arm 232 are connected to the high-altitude solid-sealing pole 220. The bottom of the high-altitude solid-sealing pole 220 is provided with a connecting base plate 260. The high-altitude solid-sealing pole 220 is connected to the horizontal moving section of the high-altitude handcart 210 through the connecting base plate 260.

[0033] Among them, the umbrella skirts 250 are respectively disposed between the upper contact arm 231 and the lower contact arm 232 and between the lower contact arm 232 and the connecting base plate 260, and the number of umbrella skirts 250 between the upper contact arm 231 and the lower contact arm 232 and the number of umbrella skirts 250 between the lower contact arm 232 and the connecting base plate 260 are the same, preferably 8 in each case; the height diameter of each umbrella skirt 250 is 200mm and the minimum diameter is 160mm, which increases the creepage distance along the surface and improves insulation.

[0034] The reinforcing rib 270 is located on the back of the high-altitude solid-sealing pole 220. The reinforcing rib 270 is close to the vertical panel section of the high-altitude handcart 210. The reinforcing rib 270 extends from the height of the upper contact arm 231 through the corresponding umbrella skirt 250 to the top of the umbrella skirt 250 between the lower contact arm 232 and the connecting base plate 260, in order to improve the overall structural strength and reliability of the high-altitude solid-sealing pole 220.

[0035] Both the upper contact arm 231 and the lower contact arm 232 are vertically arranged with the high-altitude solid-sealing pole 220. The distance between the upper contact arm 231 and the lower contact arm 232 is increased to 360mm, and the distance between the lower contact arm 232 and the bottom of the connecting base plate 260 is 290mm, which meets the high-altitude climbing distance requirements.

[0036] refer to Figure 4 The high-altitude solid-sealed pole 220 is preferably made of high thermal conductivity epoxy resin material, which ensures the heat dissipation performance of the circuit breaker and the 1.1X4000A temperature rise performance requirement. The high-altitude solid-sealed pole 220 is equipped with an insulating pull rod 221 inside. An asymmetric umbrella skirt assembly 222 is set between the insulating pull rod 221 and the high-altitude solid-sealed pole 220. The asymmetric umbrella skirt assembly 222 includes umbrella skirts of different sizes set at intervals. By setting the asymmetric umbrella skirt assembly 222, the electric field distribution is optimized and the effective creepage distance is increased without changing the overall size.

[0037] Further optimization involves encapsulating the vacuum arc-extinguishing chamber inside the high-altitude solidified pole 220 with a silicone rubber buffer layer. The silicone layer can absorb mechanical vibration and thermal expansion and contraction stress, protecting the arc-extinguishing chamber from damage during the solidification process and improving structural stability.

[0038] The high-altitude solid-sealed pole 220 has an overall height of 744.5mm, a rust-red color, a smooth surface without dark lines, uniform casting without shrinkage cavities, air holes, or stress concentration, and a partial discharge value of less than 5pC; it meets the creepage distance requirements at an altitude of 3000 meters, and has an external insulation withstand voltage of 83kV and a lightning impulse withstand voltage of 160kV.

[0039] For further explanation, please refer to Figures 5-8 The handcart interlocking unit 300 includes a U-shaped valve 310, a valve interlocking mechanism 320, a valve slide 330, and a limiting post 340. The valve slide 330 is installed on the mounting plate 110. There are two valve slides 330, which are arranged vertically on the left and right sides of the mounting plate 110. The left and right sides of the U-shaped valve 310 are slidably connected to the mounting plate 110 through the corresponding valve slide 330. At the same time, the U-shaped valve 310 is insulated from the mounting plate 110. The U-shaped valve 310 is located outside the plug-in end of the high-altitude contact box 400. Therefore, a gap is reserved between the U-shaped valve 310 and the mounting plate 110.

[0040] The limiting post 340 is set on the mounting plate 110 to limit the movement distance of the U-shaped valve 310 and ensure safe and reliable movement. The number of valve interlocking mechanisms 320 is also preferably two. The two valve interlocking mechanisms 320 are set one-to-one with the two valve slides 330. The movable end of the valve interlocking mechanism 320 is movably connected to the handcart compartment 101, and the connecting end of the valve interlocking mechanism 320 is connected to the U-shaped valve 310.

[0041] In actual operation, when the high-altitude handcart 210 is swung in or out, it cooperates with the movable end of the valve interlocking mechanism 320 to drive the valve interlocking mechanism 320 to open or close the plug-in end of the high-altitude contact box 400, thereby realizing the interlocking switch of the high-altitude circuit breaker 220.

[0042] refer to Figure 5 , Figure 6 and Figure 7 To further explain, the Z-shaped valve 310 includes an upper valve 311, a lower valve 312, a Z-shaped connecting plate 313, and an insulating connecting plate 314. The opening directions of the two valve slides 330 are parallel to and opposite to the mounting plate 110. The insulating connecting plate 314 has a T-shaped structure. One side of the parallel section of the insulating connecting plate 314 extends into the opening of the corresponding valve slide 330, and the other side of the parallel section of the insulating connecting plate 314 is located outside the corresponding valve slide 330. The bottom end of the Z-shaped connecting plate 313 is connected to the other side of the parallel section of the insulating connecting plate 314 by countersunk screws, and the top end of the Z-shaped connecting plate 313 is connected to the horizontal end face of the corresponding upper valve 311 or the horizontal end face of the lower valve 312 by nylon screws. This increases the creepage distance requirement and meets the insulation requirements at an altitude of 3000 meters.

[0043] The left and right sides of the upper valve 311 and the left and right sides of the lower valve 312 are insulatedly connected to the valve slide groove 330 through Z-shaped connecting plates 313 and insulating connecting plates 314. One end of the Z-shaped connecting plate 313 is slidably connected to the valve slide groove 330 through the insulating connecting plate 314, and the other end of the Z-shaped connecting plate 313 is connected to the upper valve 311 and the lower valve 312 through screws. The Z-shaped connecting plate 313 is arranged in the same direction as the plug-in end of the high-altitude contact box 400. The insulating connecting plate 314 is connected to the connecting end of the valve interlocking mechanism 320. The connecting end of the valve interlocking mechanism 320 synchronously drives the upper valve 311 and the lower valve 312 to move closer or further apart through the insulating connecting plate 314, thereby realizing the opening and closing of the plug-in end of the high-altitude contact box 400. The upper valve 311 and the lower valve 312 are both located outside the plug-in end of the high-altitude contact box 400.

[0044] The limiting post 340 is set between the upper valve 311 and the lower valve 312. There are two limiting posts 340. The two limiting posts 340 limit the downward movement of the upper valve 311 and limit the upward movement of the lower valve 312, so that when the upper valve 311 and the lower valve 312 are closed, the shielding closure of the plug end of the high-altitude contact box 400 can be achieved accurately and reliably.

[0045] The distance between the upper valve 311 and the lower valve 312 and the mounting plate 110 is 135mm. The plug-in end of the high-altitude contact box 400 passes through the mounting plate 110. The preferred distance between the plug-in end of the high-altitude contact box 400 and the mounting plate 110 is 130mm. This allows the left and right sides of the upper valve 311 or the lower valve 312 to form a Z-shaped structure after being connected to the Z-shaped connecting plate 313. The Z-shaped connecting plate 313 can be made of epoxy resin, which meets the insulation performance requirements of the handcart interlocking unit 300 to ground.

[0046] To further explain, the high-altitude contact box 400 includes an upper contact box 410, an upper stationary contact 420, a lower contact box 430, and a lower stationary contact 440; the upper stationary contact 420 is located inside the upper contact box 410, and the lower stationary contact 440 is located inside the lower contact box 430; the other end of the bus output unit 600 extends through the terminal of the upper contact box 410 into the interior of the upper contact box 410 and connects with the upper stationary contact 420; the other end of the bus input unit 500 extends through the terminal of the lower contact box 430 into the interior of the lower contact box 430 and connects with the lower stationary contact 440.

[0047] The terminals of the upper contact box 410 and the lower contact box 430 are both located in the busbar compartment 102. The plug-in terminals of the upper contact box 410 and the lower contact box 430 extend through the mounting plate 110 to the handcart compartment 101. The plug-in terminal of the upper contact box 410 is opposite to the upper contact arm 231, and the plug-in terminal of the lower contact box 430 is opposite to the lower contact arm 232. Both the ends of the upper contact arm 231 and the lower contact arm 232 are provided with staggered contacts. The staggered contacts engage with the upper stationary contact 420 in the upper contact box 410 and the lower stationary contact 440 in the lower contact box 430 to achieve the connection of the primary conductive circuit. The circuit is controlled by the opening and closing of the high-altitude circuit breaker 200.

[0048] Driven by the valve interlocking mechanism 320, the upper valve 311 moves to the front of the upper contact box 410 insertion end to close the upper contact box 410 insertion end, or moves above the upper contact box 410 insertion end to open the upper contact box 410 insertion end; similarly, the lower valve 312 opens and closes the lower contact box 430 through the valve interlocking mechanism 320.

[0049] The distance between the plug-in terminals of the upper contact box 410 and the lower contact box 430 and the mounting plate 110 is 130mm, which solves the insulation problem between the stationary contact and the mounting plate, and meets the power frequency withstand voltage of 83kV / min. After on-site correction and testing: power frequency withstand voltage: 83kV / 1min without flashover; lightning impulse: 160kV 1.2 / 50μs pass; partial discharge: ≤3pC 1.2Ur; insulation resistance retention rate >98% after 100 cycles of temperature cycling test from -40℃ to +80℃.

[0050] For further explanation, please refer to Figure 1 and Figure 2 The busbar input unit 500 includes an overhead busbar 510, a sensor 520, a lower branch 530, and a through-type current transformer 540. The upper end of the overhead busbar 510 extends to the outside of the armored cabinet 100. A heat shrink tubing is fitted over the upper end of the overhead busbar 510. The upper end of the overhead busbar 510 is connected to the armored cabinet 100 through a busbar bushing 120. The overhead busbar 510 is connected to the busbar compartment 102 through the sensor 520. The lower end of the overhead busbar 510 passes through the through-type current transformer 540 and is connected to one end of the lower branch 530. The sensor 520 of the lower branch 530 is connected to the mounting plate 110. The other end of the lower branch 530 passes through the wiring terminal of the lower contact box 430 and is connected to the lower stationary contact 440.

[0051] refer to Figure 9 The busbar bushing 120 is designed with a height of 350mm, a length of 165mm extending from the busbar bushing 120 to the busbar chamber 102, a mounting surface thickness of 30mm, an inner diameter of 145mm, an outer awning diameter of 224mm, and the bushing meets the requirements of 83kV power frequency withstand voltage and 160kV lightning impulse, with a partial discharge of no more than 3pC.

[0052] The bus output unit 600 includes a main busbar 610 and an upper branch 620. The bottom end of the upper branch 620 extends through the wiring terminal of the upper contact box 410 and into the interior of the upper contact box 410 to connect with the upper stationary contact 420. The upper branch 620 is connected to the busbar chamber 102 through an insulator 130. The upper end of the upper branch 620 is connected to the corresponding main busbar 610. The main busbar 610 extends to the outside of the armored cabinet 100. The main busbar 610 is connected to the armored cabinet 100 through a busbar sleeve 120. A heat shrink tubing is fitted on the outside of the main busbar 610.

[0053] refer to Figure 10 The insulator 130 is designed with a height of 300mm, an upper flange diameter of 85mm, a lower flange diameter of 100mm, an end face single distance of M16, a perforated skirt diameter of 130mm, and a bending strength ≥12kN. This insulator 130 meets the requirements of power frequency withstand voltage of 83kV and lightning impulse of 160kV, and partial discharge of no more than 3pC.

[0054] Example 2 Based on Example 1, this example provides an operation method for a 24kV high-altitude, high-capacity high-voltage switchgear, including the following steps: The crossflow fan 700 is started, and the cold air outside the armored cabinet 100 enters the front lower chamber 103 from the bottom of the armored cabinet 100. The first heat exchange fan 710 and the second heat exchange fan 720 respectively dissipate heat from the handcart chamber 101 and the busbar chamber 102. The high-altitude circuit breaker 200 is jacked into the truck compartment 101 and, with the cooperation of the truck interlocking unit 300, opens the high-altitude contact box 400, so that the high-altitude circuit breaker 200 is connected to the high-altitude contact box 400. The high-altitude circuit breaker 200 is jacked out from the truck compartment 101 and, in coordination with the truck interlocking unit 300, closes the high-altitude contact box 400, thus disconnecting the high-altitude circuit breaker 200 from the high-altitude contact box 400.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

Claims

1. A 24kV high-altitude, high-capacity high-voltage switchgear, characterized in that, It includes an armored cabinet (100), a high-altitude circuit breaker (200), a handcart interlocking unit (300), a high-altitude contact box (400), a busbar input unit (500), and a busbar output unit (600). The high-altitude circuit breaker (200) is matched with the handcart interlocking unit (300). Both the high-altitude circuit breaker (200) and the handcart interlocking unit (300) are located in the handcart compartment (101) of the armored cabinet (100). One end of the busbar input unit (500) and the busbar output unit (600) are located on the outside of the armored cabinet (100), and the other end of the busbar input unit (500) and the busbar output unit (600) are located in the busbar compartment (102) of the armored cabinet (100). An installation plate (110) is provided inside the armored cabinet (100). The installation plate (110) is located between the handcart compartment (101) and the busbar compartment (102). The handcart interlocking unit (300) is insulated from the installation plate (110). The high-altitude contact box (400) is connected to the installation plate (110). The plug-in end of the high-altitude contact box (400) extends to the handcart compartment (101) and is opposite to the high-altitude circuit breaker (200). The wiring end of the high-altitude contact box (400) extends to the busbar compartment (102). The wiring end of the high-altitude contact box (400) is connected to the other end of the busbar input unit (500) and the other end of the busbar output unit (600), respectively. The high-altitude circuit breaker (200) includes a high-altitude handcart (210), a high-altitude solid-sealed pole (220), a contact arm (230), and a spring mechanism (240); the contact arm (230) includes an upper contact arm (231) and a lower contact arm (232). The high-altitude solid-sealed pole (220) is vertically installed on the horizontal moving section of the high-altitude handcart (210), and the spring mechanism (240) is installed on the vertical panel section of the high-altitude handcart (210). The spring mechanism (240) is connected to the high-altitude solid-sealed pole (220) in a driving connection. The upper contact arm (231) and the lower contact arm (232) are both connected to the high-altitude solid-sealed pole (220) in the horizontal direction. The upper contact arm (231) and the lower contact arm (232) are both directly opposite the plug-in end of the high-altitude contact box (400). The 24kV high-altitude high-capacity high-voltage switchgear also includes a high-altitude heat exchange unit, which includes a crossflow fan (700), a first heat exchange fan (710), and a second heat exchange fan (720). The crossflow fan (700) is installed in the lower front chamber (103) of the armored cabinet (100). The lower front chamber (103) is located below the handcart compartment (101) and is connected to the handcart compartment (101) and the busbar compartment (102) respectively. The first heat exchange fan (710) and the second heat exchange fan (720) are both located at the top of the armored cabinet (100). The first heat exchange fan (710) is connected to the handcart compartment (101), and the second heat exchange fan (720) is connected to the busbar compartment (102).

2. The 24kV high-altitude, high-capacity high-voltage switchgear according to claim 1, characterized in that, The high-altitude solid-sealing pole (220) is provided with umbrella skirts (250) and reinforcing ribs (270). The bottom of the high-altitude solid-sealing pole (220) is connected to the horizontal moving section of the high-altitude handcart (210) through a connecting base plate (260). There are 16 umbrella skirts (250), with 8 umbrella skirts (250) provided between the upper contact arm (231) and the lower contact arm (232) and between the lower contact arm (232) and the connecting base plate (260). The reinforcing ribs (270) are provided on the back of the high-altitude solid-sealing pole (220). The outer diameter of the umbrella skirt (250) is 200mm, and the inner diameter of the umbrella skirt (250) is 160mm. The distance between the upper contact arm (231) and the lower contact arm (232) is 360mm, and the distance between the lower contact arm (232) and the bottom of the connecting base plate (260) is 290mm. The depth of the handcart compartment (101) is 995mm, and the stroke of the handcart compartment (101) is 310mm.

3. The 24kV high-altitude, high-capacity high-voltage switchgear according to claim 1, characterized in that, The high-altitude solid-sealing pole (220) is equipped with an insulating pull rod (221), and an asymmetrical umbrella skirt assembly (222) is provided between the insulating pull rod (221) and the high-altitude solid-sealing pole (220); the high-altitude solid-sealing pole (220) is made of high thermal conductivity epoxy resin material.

4. The 24kV high-altitude, high-capacity high-voltage switchgear according to claim 3, characterized in that, The handcart interlocking unit (300) includes a U-shaped valve (310), a valve interlocking mechanism (320), a valve slide (330), and a limiting post (340). The U-shaped valve (310) is sleeved on the outside of the plug-in end of the high-altitude contact box (400). There are two valve slides (330), which are arranged on opposite sides of the mounting plate (110). The two ends of the U-shaped valve (310) are respectively insulatedly connected to the corresponding valve slides (330). The limiting post (340) is arranged on the mounting plate (110) to limit the movement distance of the U-shaped valve (310). There are two valve interlocking mechanisms (320). The two valve interlocking mechanisms (320) are respectively located on opposite sides of the handcart compartment (101). The movable end of the valve interlocking mechanism (320) is connected to the handcart compartment (101), and the connecting end of the valve interlocking mechanism (320) is connected to the U-shaped valve (310).

5. The 24kV high-altitude, high-capacity high-voltage switchgear according to claim 4, characterized in that, The Z-shaped valve (310) includes an upper valve (311), a lower valve (312), a Z-shaped connecting plate (313), and an insulating connecting plate (314). The left and right sides of the upper valve (311) and the left and right sides of the lower valve (312) are insulatedly connected to the valve slide (330) through a Z-shaped connecting plate (313) and an insulating connecting plate (314). The Z-shaped connecting plate (313) is slidably connected to the valve slide (330) through the insulating connecting plate (314). The insulating connecting plate (314) is connected to the connecting end of the valve interlocking mechanism (320). The upper valve (311) and the lower valve (312) are both located outside the plug-in end of the high-altitude contact box (400). The limiting post (340) is located between the upper valve (311) and the lower valve (312).

6. The 24kV high-altitude, high-capacity high-voltage switchgear according to claim 5, characterized in that, The high-altitude contact box (400) includes an upper contact box (410), an upper stationary contact (420), a lower contact box (430), and a lower stationary contact (440). The upper stationary contact (420) is disposed inside the upper contact box (410), and the lower stationary contact (440) is disposed inside the lower contact box (430); the other end of the bus output unit (600) extends through the terminal of the upper contact box (410) into the interior of the upper contact box (410) and connects with the upper stationary contact (420); the other end of the bus input unit (500) extends through the terminal of the lower contact box (430) into the interior of the lower contact box (430) and connects with the lower stationary contact (440); The terminals of the upper contact box (410) and the lower contact box (430) are both located in the busbar compartment (102). The plug-in terminals of the upper contact box (410) and the lower contact box (430) extend through the mounting plate (110) to the handcart compartment (101). The insertion end of the upper contact box (410) is opposite to the upper contact arm (231), and the insertion end of the lower contact box (430) is opposite to the lower contact arm (232). The distance between the insertion end of the upper contact box (410) and the insertion end of the lower contact box (430) and the mounting plate (110) is 130mm. The distance between the insertion end of the upper contact box (410) and the upper valve (311) and the distance between the insertion end of the lower contact box (430) and the lower valve (312) are both 5mm.

7. The 24kV high-altitude, high-capacity high-voltage switchgear according to claim 6, characterized in that, The busbar input unit (500) includes an overhead busbar (510), a sensor (520), a lower branch (530), and a through-type current transformer (540). The upper end of the overhead busbar (510) extends to the outside of the armored cabinet (100). The upper end of the overhead busbar (510) is fitted with a heat shrink tubing. The upper end of the overhead busbar (510) is connected to the armored cabinet (100) through the busbar bushing (120). The overhead busbar (510) is connected to the busbar compartment (102) through the sensor (520). The lower end of the overhead busbar (510) passes through the through-type current transformer (540) and is connected to one end of the lower branch (530). The lower branch (530) is connected to the mounting plate (110) through the sensor (520). The other end of the lower branch (530) passes through the wiring terminal of the lower contact box (430) and is connected to the lower stationary contact (440). The bus output unit (600) includes a main bus (610) and an upper branch (620). The bottom end of the upper branch (620) extends through the wiring terminal of the upper contact box (410) to the inside of the upper contact box (410) and connects with the upper stationary contact (420). The upper branch (620) is connected to the bus chamber (102) through an insulator (130). The upper end of the upper branch (620) is connected to the corresponding main bus (610). The main bus (610) extends to the outside of the armored cabinet (100). The main bus (610) is connected to the armored cabinet (100) through a bus bushing (120). The outside of the main bus (610) is fitted with a heat shrink tubing.

8. An operation method for a 24kV high-altitude, high-capacity high-voltage switchgear, characterized in that, The 24kV high-altitude, high-capacity high-voltage switchgear according to claim 1 includes the following steps: Start the crossflow fan (700) to draw the cold air outside the armored cabinet (100) into the front lower chamber (103) from the bottom of the armored cabinet (100), and then dissipate heat in the handcart chamber (101) and busbar chamber (102) through the first heat exchange fan (710) and the second heat exchange fan (720) respectively. The high-altitude circuit breaker (200) is spun in from the truck compartment (101), and the high-altitude contact box (400) is opened in cooperation with the truck interlocking unit (300), so that the high-altitude circuit breaker (200) is connected to the high-altitude contact box (400); The high-altitude circuit breaker (200) is swung out from the truck compartment (101) and, in cooperation with the truck interlocking unit (300), closes the high-altitude contact box (400), thus disconnecting the high-altitude circuit breaker (200) from the high-altitude contact box (400).

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