24kV high-altitude high-capacity high-voltage switchgear and operation method

Abstract

The invention relates to the technical field of high-altitude high-capacity high-voltage switches, in particular to 24kV high-altitude high-capacity high-voltage switchgear and an operation method, and the 24kV high-altitude high-capacity high-voltage switchgear comprises an armored cabinet body, a high-altitude circuit breaker, a handcart interlocking unit, a high-altitude contact box, a busbar input unit and a busbar output unit. The handcart interlocking unit is connected with the mounting plate in an insulating manner, so that the creepage distance is increased, the insulating property is improved, the insulating property requirement of high-voltage switch equipment in a high-altitude environment is met, and the high-altitude use requirement can be met; and meanwhile, an armored cabinet body is matched, so that the overall structure is more compact, and installation and operation are simpler and more convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of high altitude large capacity high voltage switches, and particularly relates to a 24 kV high altitude large capacity high voltage switchgear and an operation method thereof. Background Art

[0002] High voltage switchgear is a key control and protection device in the power system, and its operating state directly affects the stability and safety of the power grid.

[0003] With the continuous increase of the distribution capacity, the market demand for 24 kV plateau products in regions such as Qinghai, Tibet, Yunnan, and Aba in Sichuan has been increasing year by year; since 24 kV high voltage switchgear can usually only be used below an altitude of 1000 meters, the insulation margin of the product is relatively low; with the continuous changes in the market and the continuous progress of technology, although the improved 24 kV high voltage switchgear can be used in areas with an altitude of about 2000 meters, in the actual test at an altitude of 3000 meters, its performance still has certain instability and cannot meet the demand for high insulation margin of 24 kV high voltage switchgear in areas with an altitude of 3000 meters. Summary of the Invention

[0004] The purpose of the present invention is to provide a 24 kV high altitude large capacity high voltage switchgear and an operation method thereof, so as to solve the technical problem that the current 24 kV high voltage switchgear cannot meet the use at high altitude.

[0005] The solution of the present invention to the above technical problem is as follows: A 24 kV high altitude large capacity high voltage switchgear includes an armored cabinet body, a high altitude circuit breaker, a handcart interlock 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 interlock unit, and both the high altitude circuit breaker and the handcart interlock unit are arranged in the handcart chamber of the armored cabinet body. One ends of the busbar input unit and the busbar output unit are both located outside the armored cabinet body, and the other ends of the busbar input unit and the busbar output unit are located in the busbar chamber of the armored cabinet body; An installation plate is arranged in the armored cabinet body, and the installation plate is located between the handcart chamber and the busbar chamber. The handcart interlock unit is insulated and connected to the installation plate, the high altitude contact box is connected to the installation plate, the insertion end of the high altitude contact box extends to the handcart chamber and faces the high altitude circuit breaker, the wiring end of the high altitude contact box extends to the busbar chamber, and the wiring end of the high altitude contact box is respectively connected to the other ends of the busbar input unit and the busbar output unit.

[0006] Further defined, the high altitude circuit breaker includes a high altitude handcart, a high altitude solidly enclosed pole, a contact arm, and a spring mechanism; the contact arm includes an upper contact arm and a lower contact arm; The high-altitude sealed pole is vertically arranged in the horizontal moving section of the high-altitude trolley, the spring mechanism is arranged in the vertical panel section of the high-altitude trolley, the spring mechanism is transmission-connected with the high-altitude sealed pole, the upper contact arm and the lower contact arm are both connected with the high-altitude sealed pole in the horizontal direction, and the upper contact arm and the lower contact arm are both opposite to the plug-in end of the high-altitude contact box.

[0007] It is further defined that the high-altitude sealed pole is provided with sheds and reinforcing ribs, and the bottom of the high-altitude sealed pole is connected to the horizontal moving section of the high-altitude trolley through a connecting bottom plate; the number of sheds is 16, and 8 sheds are provided between the upper contact arm and the lower contact arm and between the lower contact arm and the connecting bottom plate, and the reinforcing ribs are provided on the back of the high-altitude sealed pole; the outer circle diameter of the shed is 200mm, and the inner circle diameter of the shed is 160mm; the spacing between the upper contact arm and the lower contact arm is 360mm, and the spacing between the lower contact arm and the bottom of the connecting bottom plate is 290mm; The depth of the trolley chamber is 995 mm, and the stroke of the trolley chamber is 310 mm.

[0008] It is further defined that an insulating pull rod is arranged inside the high-altitude solid-sealed pole, and an asymmetric shed group is arranged between the insulating pull rod and the high-altitude solid-sealed pole; the high-altitude solid-sealed pole is made of high thermal conductivity epoxy resin material.

[0009] It is further defined that the trolley interlocking unit includes an X-shaped valve, a valve interlocking mechanism, a valve slide slot and a limit column; The "X"-shaped valve sleeve is arranged on the outside of the plug-in end of the high-altitude contact box, the number of the valve slide grooves is two, the two valve slide grooves are arranged on opposite sides of the mounting plate, the two ends of the "X"-shaped valve are respectively insulated and connected with the corresponding valve slide grooves, and the limit column is arranged on the mounting plate to limit the movable distance of the "X"-shaped valve; There are two valve interlocking mechanisms, which are respectively arranged on opposite sides of the trolley chamber, the movable ends of the valve interlocking mechanisms are connected to the trolley chamber, and the connecting ends of the valve interlocking mechanisms are connected to the "X"-shaped valve.

[0010] It is further defined that the X-shaped valve comprises 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 insulated and connected to the valve slide groove through a Z-shaped connecting plate and an insulating connecting plate, the Z-shaped connecting plate is slidably connected to the valve slide groove through the insulating connecting plate, the insulating connecting plate is connected to the connecting end of the valve interlocking mechanism, and the upper valve and the lower valve are both located outside the plug-in end of the high-altitude contact box; The limiting column is arranged between the upper valve and the lower valve.

[0011] Further defined, the high altitude contact box includes an upper contact box, an upper static contact, a lower contact box and a lower static contact; The upper static contact is arranged inside the upper contact box, and the lower static contact is arranged inside the lower contact box; the other end of the busbar output unit passes through the wiring terminal of the upper contact box and extends into the upper contact box to be connected with the upper static contact; the other end of the busbar input unit passes through the wiring terminal of the lower contact box and extends into the lower contact box to be connected with the lower static contact; The wiring terminals of the upper contact box and the lower contact box are both located in the busbar chamber, and the plug-in ends of the upper contact box and the lower contact box both pass through the mounting plate and extend into the handcart chamber; The plug-in end of the upper contact box faces the upper contact arm, and the plug-in end of the lower contact box faces the lower contact arm. The distances between the plug-in ends of the upper contact box and the lower contact box and the mounting plate are both 130 mm, and the distances between the plug-in end of the upper contact box and the upper shutter and between the plug-in end of the lower contact box and the lower shutter are both 5 mm.

[0012] Further defined, the busbar input unit includes an overhead busbar, a sensor, a lower branch busbar and a through-type current transformer; The upper end of the overhead busbar extends to the outside of the armored cabinet, a heat shrinkable tube is sleeved on the upper end of the overhead busbar, the upper end of the overhead busbar is connected to the armored cabinet through a bushing, the overhead busbar is connected to the busbar chamber through a sensor, the lower end of the overhead busbar passes through the through-type current transformer and is connected to one end of the lower branch busbar, the lower branch busbar sensor is connected to the mounting plate, and the other end of the lower branch busbar passes through the wiring terminal of the lower contact box and is connected to the lower static contact; The busbar output unit includes a main busbar and an upper branch busbar. The bottom end of the upper branch busbar passes through the wiring terminal of the upper contact box and extends into the upper contact box to be connected with the upper static contact. The upper branch busbar is connected to the busbar chamber through an insulator. The upper end of the upper branch busbar is respectively connected to the corresponding main busbar. The main busbar extends to the outside of the armored cabinet, the main busbar is connected to the armored cabinet through a bushing, and a heat shrinkable tube is sleeved on the outside of the main busbar.

[0013] Further defined, the 24 kV high altitude large-capacity high-voltage switchgear further includes a high altitude heat exchange unit. The high altitude heat exchange unit includes a cross-flow fan, a first heat exchange fan and a second heat exchange fan. The cross-flow fan is arranged in the front lower chamber of the armored cabinet. The front lower chamber is located below the handcart chamber and is respectively communicated with the handcart chamber and the busbar chamber. The first heat exchange fan and the second heat exchange fan are both located at the top of the armored cabinet. The first heat exchange fan is communicated with the handcart chamber, and the second heat exchange fan is communicated with the busbar chamber.

[0014] An operation method for a 24 kV high altitude large-capacity high-voltage switchgear, based on the above-mentioned 24 kV high altitude large-capacity high-voltage switchgear, includes the following steps: Start the cross-flow fan. After the cold air outside the armored cabinet enters the front lower chamber from the bottom of the armored cabinet, the handcart chamber and the busbar chamber are respectively cooled by the first heat exchange fan and the second heat exchange fan. The high-altitude circuit breaker is inserted into the handcart chamber. The handcart interlock unit is used to cooperate to open the high-altitude contact box, so that the high-altitude circuit breaker is connected to the high-altitude contact box. The high-altitude circuit breaker is withdrawn from the handcart chamber. The handcart interlock unit is used to cooperate to close the high-altitude contact box, so that the high-altitude circuit breaker is disconnected from the high-altitude contact box.

[0015] The beneficial effects of the present invention are as follows: 1. By improving the high-altitude circuit breaker and the handcart interlock unit, and insulatingly connecting the handcart interlock unit to the mounting plate, the creepage distance is increased, the insulation performance is improved, and the creepage distance is increased to meet the insulation performance requirements of high-voltage switchgear in high-altitude environments, and the high-altitude use requirements can be met. At the same time, in cooperation with the armored cabinet, the overall structure is more compact, and installation and operation are simpler and more convenient.

[0016] 2. By increasing the distance between the upper contact arm and the lower contact arm on the high-altitude cast resin pole, the creepage distance is increased, the insulation performance is improved, and the high-altitude creepage distance requirements are met; umbrella skirts are added to increase the creepage distance along the surface and improve the insulation; at the same time, an asymmetric umbrella skirt group is arranged inside it to optimize the electric field distribution through the asymmetric umbrella skirt group, increase the effective creepage distance without changing the overall size; and the spring mechanism and the high-altitude cast resin pole are arranged front and back, making the structure more compact, the action transmission response faster, and the efficiency higher.

[0017] 3. The present invention increases the distance that the upper contact box insertion end and the lower contact box insertion end extend out of the mounting plate, effectively increasing the creepage distance between the live parts inside the high-altitude contact box and the mounting plate; at the same time, the z-shaped connecting plate is used to realize the sliding connection between the upper valve and the lower valve and the upper valve chute on the mounting plate, ensuring that the upper / lower valve can be located at the front end of the upper / lower contact box insertion end, ensuring the reliable and stable movement of the upper and lower valves, and at the same time ensuring the insulation of the connection of the j-shaped valve, increasing the creepage ratio and further meeting the use requirements in high-altitude environments.

[0018] 4. By arranging a cross-flow fan on the armored cabinet, the cold air outside the armored cabinet is actively sucked from the bottom into the front lower chamber of the armored cabinet and then blown into the handcart chamber and the busbar chamber respectively, and then in cooperation with the first heat exchange fan and the second heat exchange fan, the heat generated during the operation inside the armored cabinet is blown out from the top, realizing air circulation cooling, improving the heat dissipation efficiency inside the armored cabinet, ensuring reliable heat dissipation in high-altitude and low-pressure environments, and further meeting the use requirements in high-altitude environments. Description of the Drawings

[0019] Figure 1Internal structure diagram of the 24 kV high altitude large capacity high voltage switchgear of the present invention; Figure 2 Side view of the 24 kV high altitude large capacity high voltage switchgear of the present invention; Figure 3 Schematic diagram of the high altitude circuit breaker structure of the present invention; Figure 4 Schematic diagram of the high altitude solidly enclosed pole structure of the present invention; Figure 5 Schematic diagram of the handcart interlock unit structure of the present invention; Figure 6 Top view of the handcart interlock unit of the present invention; Figure 7 is Figure 6 Enlarged schematic diagram of part A in; Figure 8 Schematic diagram of the upper contact box structure of the present invention; Figure 9 Schematic diagram of the bushing structure of the present invention; Figure 10 Schematic diagram of the insulator structure of the present invention.

[0020] In the figure, 100 - armored cabinet; 101 - handcart chamber; 102 - bus chamber; 103 - front lower chamber; 110 - mounting plate; 120 - bushing; 130 - insulator; 200 - high altitude circuit breaker; 210 - high altitude handcart; 220 - high altitude solidly enclosed pole; 221 - insulating pull rod; 222 - asymmetric umbrella skirt group; 230 - contact arm; 231 - upper contact arm; 232 - lower contact arm; 240 - spring mechanism; 250 - umbrella skirt; 260 - connecting bottom plate; 270 - stiffener; 300 - handcart interlock unit; 310 - U-shaped shutter; 311 - upper shutter; 312 - lower shutter; 313 - Z-shaped connecting plate; 314 - insulating connecting plate; 320 - shutter interlock mechanism; 330 - shutter chute; 340 - limit post; 400 - high altitude contact box; 410 - upper contact box; 420 - upper static contact; 430 - lower contact box; 440 - lower static contact; 500 - bus input unit; 510 - overhead bus; 520 - sensor; 530 - lower branch bus; 540 - through-type current transformer; 600 - bus output unit; 610 - main bus; 620 - upper branch bus; 700 - cross-flow fan; 710 - first heat exchange fan; 720 - second heat exchange fan. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] Embodiment 1 Reference Figures 1 - 10 , this embodiment provides a 24 kV high-altitude large-capacity high-voltage switchgear, including an armored cabinet 100, a high-altitude circuit breaker 200, a trolley interlock 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 trolley interlock unit 300, and the high-altitude contact box 400, optimizing the insulation of the busbar input unit 500 and the busbar output unit 600, and improving the overall insulation margin of the product, so as to meet the use requirements of high-voltage switchgear at an altitude of 3000 km.

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

[0024] Reference Figure 1 and Figure 2 , an installation plate 110, a trolley compartment 101, a busbar compartment 102, and a front lower compartment 103 are arranged inside the armored cabinet 100. The front lower compartment 103 is respectively communicated with the trolley compartment 101 and the busbar compartment 102. The high-altitude circuit breaker 200 and the trolley interlock unit 300 are both located in the trolley compartment 101. The high-altitude contact box 400 is installed on the installation plate 110. The insertion end of the high-altitude contact box 400 passes through the installation plate 110 and extends into the trolley compartment 101, and is used to complete connection and disconnection with the high-altitude circuit breaker 200 under the cooperation of the trolley interlock unit 300; the wiring end of the high-altitude contact box 400 passes through the installation plate 110 and extends into the busbar compartment 102, and 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 both extend to the outside of the armored cabinet 100, and the other end of the busbar input unit 500 and the other end of the busbar output unit 600 are located in the busbar compartment 102 and are connected to the wiring of the high-altitude contact box 400.

[0026] Reference Figure 1 andFigure 2 The high-altitude heat exchange unit includes a cross-flow 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 at the top outside the armored cabinet 100. The first heat exchange fan 710 communicates with the handcart chamber 101, and the second heat exchange fan 720 communicates with the busbar chamber 102.

[0027] During actual use, after the cross-flow fan 700 starts, it sucks the low-pressure cold air outside the armored cabinet 100 from the bottom of the armored cabinet 100 into the front lower chamber 103, and then blows it into the handcart chamber 101 and the busbar chamber 102 respectively, for heat exchange and cooling of the high-altitude circuit breaker 200, the handcart interlock unit 300, the high-altitude contact box 400, the busbar input unit 500, and the busbar output unit 600 respectively. The heat-exchanged air is discharged outside the armored cabinet 100 through the first heat exchange fan 710 and the second heat exchange fan 720 respectively to achieve heat exchange; by establishing a heat exchange cycle, the flow rate of the heat exchange air 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, refer to Figures 1 - 5 The high-altitude circuit breaker 200 includes a high-altitude handcart 210, a high-altitude solid-sealed pole column 220, a contact arm 230, and a spring mechanism 240; the high-altitude handcart 210 is of an L-shaped structure. The high-altitude handcart 210 is movably connected to the handcart chamber 101 through a lead screw, and the high-altitude handcart 210 is rocked in or out by turning the lead screw with a handle; the width of the horizontal moving section of the high-altitude handcart 210 is increased to 1100 mm, the height of the high-altitude handcart 210 is 310 mm, and the depth of the handcart chamber 101 is 995 mm, ensuring the reliability of the high-altitude handcart 210 being rocked in and out.

[0029] Left / right sealing plates are preferably arranged on both the left and right sides of the high-altitude handcart 210, and the protection level of the high-altitude handcart 210 at the test position is IP2X by setting the left / right sealing plates.

[0030] The high-altitude sealed pole 220 is installed in the horizontal moving section of the high-altitude trolley 210 in the vertical direction. The high-altitude sealed pole 220 is located between the mounting plate 110 and the vertical panel section of the high-altitude trolley 210. The contact arm 230 is vertically connected to the high-altitude 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 trolley interlocking unit 300 is insulated and connected to the mounting plate 110. The trolley interlocking unit 300 is sleeved on the outside of the plug-in end of the high-altitude contact box 400. The high-altitude trolley 210 is interlocked with the trolley interlocking unit 300; the spring mechanism 240 is arranged in the vertical panel section of the high-altitude trolley 210, and the spring mechanism 240 is transmission-connected to the high-altitude sealed pole 220, so as to realize the reliable breaking of the 4000A high-altitude circuit breaker 200, meeting the requirements of rated current 4000A and rated short-circuit breaking 40kA.

[0031] The spring mechanism has a 240 modular design, the switch opening and closing operations are stable and reliable, the output characteristics meet the 4800N contact pressure of the circuit breaker arc extinguishing chamber, the structure is compact, and the operation is stable and reliable.

[0032] Specifically, refer to Figure 3 and Figure 4 The high-altitude sealed pole 220 is provided with an umbrella 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, and the upper contact arm 231 and the lower contact arm 232 are both connected to the high-altitude sealed pole 220, and a connecting bottom plate 260 is provided at the bottom of the high-altitude sealed pole 220, and the high-altitude sealed pole 220 is connected to the horizontal moving section of the high-altitude trolley 210 through the connecting bottom plate 260.

[0033] Among them, the sheds 250 are respectively arranged 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 sheds 250 between the upper contact arm 231 and the lower contact arm 232 is the same as the number of sheds 250 between the lower contact arm 232 and the connecting base plate 260, and preferably both are 8; the high diameter of each shed 250 is 200 mm and the lowest diameter is 160 mm, which increases the creepage distance along the surface and improves insulation.

[0034] The reinforcing rib 270 is arranged on the back of the high-altitude sealed pole 220, and the reinforcing rib 270 is close to the vertical panel section of the high-altitude trolley 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 bottom plate 260, so as to improve the overall structural strength and reliability of the high-altitude sealed pole 220.

[0035] Both the upper contact arm 231 and the lower contact arm 232 are vertically arranged with respect to the high-altitude encapsulated pole 220. The distance between the upper contact arm 231 and the lower contact arm 232 is increased to 360 mm, and the distance between the lower contact arm 232 and the bottom of the connecting base plate 260 is 290 mm, meeting the creepage distance requirements for high altitude.

[0036] Reference Figure 4 , The high-altitude encapsulated pole 220 is preferably made of a high thermal conductivity epoxy resin material, ensuring the heat dissipation performance of the circuit breaker and meeting the 1.1X4000A temperature rise performance requirements; an insulating pull rod 221 is provided inside the high-altitude encapsulated pole 220, and an asymmetric umbrella skirt group 222 is provided between the insulating pull rod 221 and the high-altitude encapsulated pole 220. The asymmetric umbrella skirt group 222 includes large and small umbrella skirts arranged at intervals. By setting the asymmetric umbrella skirt group 222, the electric field distribution is optimized, and the effective creepage distance is increased without changing the overall dimensions.

[0037] Further preferably, the vacuum arc extinguishing chamber inside the high-altitude encapsulated pole 220 is encapsulated with a silicone rubber buffer layer. The silicone layer can absorb mechanical vibration and thermal expansion and contraction stress, protect the arc extinguishing chamber from damage during the encapsulation process, and improve the structural stability.

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

[0039] Further explanation, reference Figures 5 - 8 , The handcart interlock unit 300 includes a U-shaped shutter 310, a shutter interlock mechanism 320, a shutter chute 330, and a limit post 340; the shutter chute 330 is installed on the mounting plate 110, and the number of shutter chutes 330 is two. The two shutter chutes 330 are arranged vertically on the left and right sides of the mounting plate 110. The left and right sides of the U-shaped shutter 310 are respectively slidably connected to the mounting plate 110 through the corresponding shutter chutes 330, and at the same time, the U-shaped shutter 310 is insulated from the mounting plate 110; the U-shaped shutter 310 is located outside the insertion end of the high-altitude contact box 400, so there is a gap reserved between the U-shaped shutter 310 and the mounting plate 110.

[0040] The limit post 340 is arranged on the mounting plate 110 to limit the moving distance of the U-shaped shutter 310 to ensure safe and reliable movement; the number of shutter interlock mechanisms 320 is also preferably two. The two shutter interlock mechanisms 320 are arranged in one-to-one correspondence with the two shutter chutes 330. The movable end of the shutter interlock mechanism 320 is movably connected to the handcart chamber 101, and the connecting end of the shutter interlock mechanism 320 is connected to the U-shaped shutter 310.

[0041] During the actual operation process, when the high-altitude trolley 210 is inserted or withdrawn, it cooperates with the movable end of the valve interlock mechanism 320, driving the valve interlock mechanism 320 to open or close the insertion end of the high-altitude contact box 400, thereby realizing the interlock switch of the high-altitude circuit breaker 220.

[0042] Reference Figure 5 、 Figure 6 and Figure 7 For further illustration, the U-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 chutes 330 are parallel and oppositely arranged to the mounting plate 110. The insulating connecting plate 314 is of a T-shaped structure. One side of the parallel section of the insulating connecting plate 314 extends into the opening of the corresponding valve chute 330, and the other side of the parallel section of the insulating connecting plate 314 is located outside the corresponding valve chute 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 a countersunk screw, 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 a nylon screw; this increases the creepage distance requirement and meets the insulation requirement at an altitude of 3000 meters.

[0043] Both 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 chute 330 through the Z-shaped connecting plate 313 and the insulating connecting plate 314. One end of the Z-shaped connecting plate 313 is slidably connected to the valve chute 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 by screws. The Z-shaped connecting plate 313 is arranged in the same direction as the insertion end of the high-altitude contact box 400, and the connecting end of the insulating connecting plate 314 is connected to the connecting end of the valve interlock mechanism 320. The connecting end of the valve interlock mechanism 320 synchronously drives the upper valve 311 and the lower valve 312 to approach or move away from each other through the insulating connecting plate 314, realizing the opening and closing of the insertion end of the high-altitude contact box 400; both the upper valve 311 and the lower valve 312 are located outside the insertion end of the high-altitude contact box 400.

[0044] The limit posts 340 are arranged between the upper valve 311 and the lower valve 312. The number of the limit posts 340 is two. The two limit posts 340 respectively limit the downward movement of the upper valve 311 and the upward movement of the lower valve 312, so that when the upper valve 311 and the lower valve 312 are closed, the insertion end of the high-altitude contact box 400 can be accurately and reliably blocked and closed.

[0045] The distances between the upper valve 311 and the lower valve 312 and the mounting plate 110 are both 135 mm. The insertion end of the high-altitude contact box 400 passes through the mounting plate 110, and the distance between the insertion end of the high-altitude contact box 400 and the mounting plate 110 is preferably 130 mm. Thus, a U-shaped structure is formed after the left and right sides of the upper valve 311 or the lower valve 312 are connected to the Z-shaped connecting plate 313. The Z-shaped connecting plate 313 can be made of epoxy resin, meeting the insulation performance requirements of the trolley interlock unit 300 to the ground.

[0046] Further explanation: The high-altitude contact box 400 includes an upper contact box 410, an upper static contact 420, a lower contact box 430, and a lower static contact 440. The upper static contact 420 is arranged inside the upper contact box 410, and the lower static contact 440 is arranged inside the lower contact box 430. The other end of the busbar output unit 600 passes through the wiring terminal of the upper contact box 410 and extends into the upper contact box 410 to be connected to the upper static contact 420. The other end of the busbar input unit 500 passes through the wiring terminal of the lower contact box 430 and extends into the lower contact box 430 to be connected to the lower static contact 440.

[0047] The wiring terminals of the upper contact box 410 and the lower contact box 430 are both located in the busbar chamber 102. The insertion ends of the upper contact box 410 and the lower contact box 430 both pass through the mounting plate 110 and extend into the trolley chamber 101. The insertion end of the upper contact box 410 faces the upper contact arm 231, and the insertion end of the lower contact box 430 faces the lower contact arm 232. Plum blossom contacts are arranged at the ends of the upper contact arm 231 and the lower contact arm 232. Through the corresponding engagement of the plum blossom contacts with the upper static contact 420 in the upper contact box 410 and the lower static contact 440 in the lower contact box 430, the primary conductive loop is connected, and the control of the loop is realized through the opening and closing of the high-altitude circuit breaker 200.

[0048] Driven by the valve interlock mechanism 320, the upper valve 311 moves to the front of the insertion end of the upper contact box 410 to close the insertion end of the upper contact box 410, or moves above the insertion end of the upper contact box 410 to open the insertion end of the upper contact box 410. Similarly, the lower valve 312 realizes the opening and closing of the lower contact box 430 through the valve interlock mechanism 320.

[0049] The distances between the insertion ends of the upper contact box 410 and the lower contact box 430 and the mounting plate 110 are both 130 mm, solving the insulation problem between the static contacts and the mounting plate, meeting the power frequency withstand voltage of 83 kV / min. After on-site correction and testing: power frequency withstand voltage: 83 kV / 1 min without flashover; lightning impulse: 160 kV 1.2 / 50 μs passed; partial discharge amount: ≤3 pC at 1.2Ur; insulation resistance retention rate > 98% after 100 temperature cycle tests from -40°C to +80°C.

[0050] For further illustration, refer to Figure 1 and Figure 2 , the main bus input unit 500 includes an overhead main bus 510, a sensor 520, a lower branch bus 530, and a through-type current transformer 540; the upper end of the overhead main bus 510 extends to the outside of the armored cabinet 100, a heat shrink tube is sleeved on the upper end of the overhead main bus 510, the upper end of the overhead main bus 510 is connected to the armored cabinet 100 through a bushing 120, the overhead main bus 510 is connected to the bus chamber 102 through the sensor 520, the lower end of the overhead main bus 510 passes through the through-type current transformer 540 and is connected to one end of the lower branch bus 530, the lower branch bus 530 is connected to the mounting plate 110 through the sensor 520, and the other end of the lower branch bus 530 passes through the wiring terminal of the lower contact box 430 and is connected to the lower static contact 440.

[0051] Refer to Figure 9 , the height of the bushing 120 is designed to be 350 mm, the length of the bushing 120 extending into the bus chamber 102 is 165 mm, the thickness of the mounting surface is 30 mm, the inner cavity diameter of the bushing 120 is 145 mm, the outer umbrella skirt diameter is 224 mm, the tube meets the power frequency withstand voltage of 83 kV and the lightning impulse of 160 kV, and the partial discharge is not more than 3 pC.

[0052] The bus output unit 600 includes a main bus 610 and an upper branch bus 620. The bottom end of the upper branch bus 620 passes through the wiring terminal of the upper contact box 410 and extends into the upper contact box 410 to be connected to the upper static contact 420. The upper branch bus 620 is connected to the bus chamber 102 through an insulator 130. The upper end of the upper branch bus 620 is respectively 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 bushing 120. A heat shrink tube is sleeved on the outside of the main bus 610.

[0053] Refer to Figure 10 , the height of the insulator 130 is designed to be 300 mm, the upper flange diameter is 85 mm, the lower flange diameter is 100 mm, the end face single pitch is M16, the hole umbrella skirt diameter is 130 mm, the bending strength is ≥12 kN, and the insulator 130 meets the power frequency withstand voltage of 83 kV and the lightning impulse of 160 kV, and the partial discharge is not more than 3 pC.

[0054] Embodiment 2 Based on Embodiment 1, this embodiment provides a method for operating a 24 kV high altitude large capacity high voltage switchgear, including the following steps: Start the cross-flow fan 700. After 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 are used to dissipate heat from the handcart chamber 101 and the bus chamber 102 respectively; The high-altitude circuit breaker 200 is rocked into the handcart chamber 101, and the high-altitude contact box 400 is opened through the cooperation of the handcart interlock 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 rocked out of the handcart chamber 101, and the high-altitude contact box 400 is closed through the cooperation of the handcart interlock unit 300, so that the high-altitude circuit breaker 200 is disconnected from the high-altitude contact box 400.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the present invention; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present invention.

Claims

1. A 24 kV high altitude large capacity high voltage switchgear, characterized in that, It comprises an armored cabinet (100), a high altitude circuit breaker (200), a trolley 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 a trolley interlocking unit (300); the high-altitude circuit breaker (200) and the trolley interlocking unit (300) are both arranged in a trolley chamber (101) of the armored cabinet (100); one end of the busbar input unit (500) and the busbar output unit (600) are both located outside the armored cabinet (100); and the other ends of the busbar input unit (500) and the busbar output unit (600) are located in the busbar chamber (102) of the armored cabinet (100); A mounting plate (110) is provided in the armored cabinet (100), the mounting plate (110) being located between the trolley chamber (101) and the busbar chamber (102), the trolley interlocking unit (300) being insulated and connected to the mounting plate (110), the high-altitude contact box (400) being connected to the mounting plate (110), the plug-in end of the high-altitude contact box (400) extending to the trolley chamber (101) and facing the high-altitude circuit breaker (200), the wiring end of the high-altitude contact box (400) extending to the busbar chamber (102), and the wiring end of the high-altitude contact box (400) being respectively connected to the other end of the busbar input unit (500) and the other end of the busbar output unit (600).

2. The 24 kV high altitude large capacity high voltage switchgear according to claim 1, characterized in that, The high altitude circuit breaker (200) comprises a high altitude trolley (210), a high altitude sealed pole (220), a contact arm (230) and a spring mechanism (240); the contact arm (230) comprises an upper contact arm (231) and a lower contact arm (232); The high-altitude sealed pole (220) is vertically arranged on a horizontal moving section of the high-altitude trolley (210); the spring mechanism (240) is arranged on a vertical panel section of the high-altitude trolley (210); the spring mechanism (240) is transmission-connected to the high-altitude sealed pole (220); the upper contact arm (231) and the lower contact arm (232) are both connected to the high-altitude sealed pole (220) in a horizontal direction; and the upper contact arm (231) and the lower contact arm (232) are both directly opposite to a plug-in end of a high-altitude contact box (400).

3. The 24 kV high altitude large capacity high voltage switchgear according to claim 2, characterized in that, The high-altitude cast resin bushing (220) is provided with umbrella skirts (250) and stiffening ribs (270). The bottom of the high-altitude cast resin bushing (220) is horizontally movably connected to the high-altitude trolley (210) through a connecting base plate (260). The number of the umbrella skirts (250) is 16. There are 8 umbrella skirts (250) both 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 stiffening ribs (270) are arranged on the back of the high-altitude cast resin bushing (220). The outer diameter of the umbrella skirt (250) is 200 mm, and the inner diameter of the umbrella skirt (250) is 160 mm. The distance between the upper contact arm (231) and the lower contact arm (232) is 360 mm, and the distance between the bottom of the lower contact arm (232) and the bottom of the connecting base plate (260) is 290 mm. The depth of the trolley compartment (101) is 995 mm, and the stroke of the trolley compartment (101) is 310 mm.

4. The 24 kV high altitude large capacity high voltage switchgear according to claim 2, characterized in that, An insulating pull rod (221) is arranged inside the high-altitude cast resin bushing (220), and an asymmetric umbrella skirt group (222) is arranged between the insulating pull rod (221) and the high-altitude cast resin bushing (220). The high-altitude cast resin bushing (220) is made of a high thermal conductivity epoxy resin material.

5. The 24 kV high altitude large capacity high voltage switchgear according to claim 4, characterized in that, The trolley interlock unit (300) includes a U-shaped shutter (310), a shutter interlock mechanism (320), a shutter chute (330), and a limit post (340). The U-shaped shutter (310) is sleeved outside the insertion end of the high-altitude contact box (400). The number of the shutter chutes (330) is two. The two shutter chutes (330) are arranged on the opposite sides of the mounting plate (110). The two ends of the U-shaped shutter (310) are respectively insulatedly connected to the corresponding shutter chutes (330). The limit post (340) is arranged on the mounting plate (110) to limit the moving distance of the U-shaped shutter (310). The number of the shutter interlock mechanisms (320) is two. The two shutter interlock mechanisms (320) are respectively arranged on the opposite sides of the trolley compartment (101). The movable ends of the shutter interlock mechanisms (320) are connected to the trolley compartment (101), and the connecting ends of the shutter interlock mechanisms (320) are connected to the U-shaped shutter (310).

6. The 24 kV high altitude large capacity high voltage switchgear according to claim 5, characterized in that, The U-shaped shutter (310) includes an upper shutter (311), a lower shutter (312), a Z-shaped connecting plate (313), and an insulating connecting plate (314). The left and right sides of the upper shutter (311) and the left and right sides of the lower shutter (312) are respectively insulatedly connected to the shutter chutes (330) through the Z-shaped connecting plate (313) and the insulating connecting plate (314). The Z-shaped connecting plate (313) is slidably connected to the shutter chutes (330) through the insulating connecting plate (314). The insulating connecting plate (314) is connected to the connecting end of the shutter interlock mechanism (320). Both the upper shutter (311) and the lower shutter (312) are located outside the insertion end of the high-altitude contact box (400). The limit post (340) is arranged between the upper shutter (311) and the lower shutter (312).

7. The 24 kV high altitude large capacity high voltage switchgear according to claim 6, characterized in that, The high-altitude contact box (400) includes an upper contact box (410), an upper static contact (420), a lower contact box (430), and a lower static contact (440); The upper static contact (420) is arranged inside the upper contact box (410), and the lower static contact (440) is arranged inside the lower contact box (430); the other end of the busbar output unit (600) passes through the wiring terminal of the upper contact box (410) and extends into the upper contact box (410) to be connected to the upper static contact (420); the other end of the busbar input unit (500) passes through the wiring terminal of the lower contact box (430) and extends into the lower contact box (430) to be connected to the lower static contact (440); The wiring terminals of the upper contact box (410) and the lower contact box (430) are both located in the busbar chamber (102), and the plug-in ends of the upper contact box (410) and the lower contact box (430) both pass through the mounting plate (110) and extend into the handcart chamber (101); The plug-in end of the upper contact box (410) faces the upper contact arm (231), the plug-in end of the lower contact box (430) faces the lower contact arm (232), the distances between the plug-in ends of the upper contact box (410) and the lower contact box (430) and the mounting plate (110) are both 130 mm, and the distances between the plug-in end of the upper contact box (410) and the upper shutter (311) and between the plug-in end of the lower contact box (430) and the lower shutter (312) are both 5 mm.

8. The 24 kV high altitude large capacity high voltage switchgear according to claim 7, characterized in that, The busbar input unit (500) includes an overhead busbar (510), a sensor (520), a lower branch busbar (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 shrinkable tube is sleeved on 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 chamber (102) through a 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 busbar (530), the lower branch busbar (530) is connected to the sensor (520) and the mounting plate (110), and the other end of the lower branch busbar (530) passes through the wiring terminal of the lower contact box (430) and is connected to the lower static contact (440); The busbar output unit (600) includes a main busbar (610) and an upper branch busbar (620). The bottom end of the upper branch busbar (620) passes through the wiring terminal of the upper contact box (410) and extends into the upper contact box (410) to be connected to the upper static contact (420). The upper branch busbar (620) is connected to the busbar chamber (102) through an insulator (130). The upper end of the upper branch busbar (620) is respectively 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 bushing (120), and a heat shrinkable tube is sleeved on the outside of the main busbar (610).

9. The 24 kV high altitude large capacity high voltage switchgear according to any one of claims 1 to 8, characterized in that, The 24 kV high altitude large capacity high voltage switchgear further includes a high altitude heat exchange unit, which includes a cross-flow fan (700), a first heat exchange fan (710) and a second heat exchange fan (720). The cross-flow fan (700) is arranged in the front lower chamber (103) of the armored cabinet (100). The front lower chamber (103) is located below the handcart chamber (101), and the front lower chamber (103) is communicated with the handcart chamber (101) and the busbar chamber (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 communicated with the handcart chamber (101), and the second heat exchange fan (720) is communicated with the busbar chamber (102).

10. A method for operating a 24 kV high altitude and large capacity high voltage switchgear, characterized in that, The 24 kV high altitude large capacity high voltage switchgear according to claim 9 includes the following steps: Start the cross-flow fan (700). After the cold air outside the armored cabinet (100) enters the front lower chamber (103) from the bottom of the armored cabinet (100), dissipate heat from the handcart chamber (101) and the 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 inserted into the handcart chamber (101). The high altitude contact box (400) is opened through the cooperation of the handcart interlock 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 withdrawn from the handcart chamber (101). The high altitude contact box (400) is closed through the cooperation of the handcart interlock unit (300), so that the high altitude circuit breaker (200) is disconnected from the high altitude contact box (400).

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