Outdoor reactive power compensation device

Abstract

The utility model relates to an outdoor reactive power compensation device, which comprises a wire inlet cabinet with a handcart circuit breaker; a first capacitor cabinet; a second capacitor cabinet; and each end part of the integrated base is provided with a plurality of rollers used for moving the outdoor reactive power compensation device. According to the utility model, by additionally arranging the handcart circuit breaker in modular design, on one hand, the automatic switching function of a plurality of capacitor cabinets of the reactive power compensation device is realized, and on the other hand, the requirement of providing an obvious breaking point during equipment maintenance is met. Compared with the prior art, the design can eliminate an isolation switch, thereby reducing the size of the cabinet body and lowering the equipment cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of medium and high voltage reactive compensation, in particular to a cabinet type medium and high voltage reactive compensation device for outdoor use. BACKGROUND

[0002] With the rapid development of national economy, more and more high-voltage and high-capacity power equipment, the power quality of power system is getting worse and worse, and the power factor is getting lower and lower. With the increasing demand of the state for the power quality and power factor of the power system, a high-voltage reactive compensation device suitable for local compensation, high power and high voltage level emerges as the times require. So-called reactive power compensation, simply called reactive compensation, plays a role in improving the power factor of the power grid in the power supply system, reducing the loss of power transformer and transmission line, improving power supply efficiency and improving power supply environment, so the reactive power compensation device plays an indispensable and very important role in the power supply system.

[0003] At present, with the continuous development and maturity of high-voltage AC and DC power transmission, customers have higher requirements for the performance of high-voltage electrical equipment. At present, for reactive power compensation equipment, safer operation, more convenient installation and maintenance, smaller land occupation, stronger environmental adaptability and other aspects have increasingly become the mainstream elements pursued by users. In order to cater to user demand and quickly meet the delivery period, it is necessary for the manufacturer of reactive power compensation equipment to quickly respond to user demand. As an example, a parallel capacitor bank for 10kV power system is disclosed in Chinese utility model patent CN208385887U, which comprises three-phase capacitor banks and isolation grounding switches arranged in the cabinet. Each three-phase capacitor bank is connected in parallel to the bus, and the incoming line end of each phase capacitor bank is connected to the isolation grounding switch.

[0004] However, in practice, it is found that the incoming line cabinet and the capacitor cabinet need to be packaged and transported separately in this type of capacitor bank, and the user needs to perform cabinet assembly operation again on site after the goods arrive on site. At the same time, the outdoor capacitor cabinet has high requirements for rainwater prevention when assembling the cabinet, which increases the difficulty of customer installation; the primary and secondary electrical connection cables between the incoming line cabinet and the capacitor cabinet are connected, and the whole can be debugged before being powered on. Especially troublesome, the capacitor switching in the prior art uses fixed circuit breakers, which do not have obvious disconnection points. If maintenance is required, a separate isolation grounding switch needs to be configured to form a maintenance type obvious disconnection point and grounding mark.

[0005] Therefore, there is a technical need in the related technical field to improve the existing reactive compensation capacitor cabinet to overcome one of the above deficiencies. UTILITY MODEL CONTENTS

[0006] Therefore, the task of the utility model is to provide an outdoor type reactive compensation device, which overcomes the above-mentioned shortcomings of the prior art. Therefore, the task of the utility model is to provide an outdoor type reactive compensation device, which overcomes the above-mentioned shortcomings of the prior art.

[0007] According to one aspect of the utility model, an outdoor type reactive power compensation device is provided, which is used for electrically connecting to a three-phase power distribution system including phase A, phase B and phase C to perform reactive power compensation, wherein the outdoor type reactive power compensation device includes: a feeder cabinet with feeder terminals electrically connected to the three-phase power distribution system including phase A, phase B and phase C and a handcart circuit breaker electrically connected to the feeder terminals, wherein the handcart circuit breaker includes a frame capable of being pulled out of the feeder cabinet and a housing mounted on the frame, wherein the housing is internally provided with an operating mechanism and a fixed pole on the upper rear side of the housing corresponding to a phase, and the lower end of the fixed pole is movably connected to the operating mechanism; a first capacitor cabinet arranged adjacent to the feeder cabinet, wherein a bus bar passing through the feeder cabinet and the first capacitor cabinet is internally provided with a first reactor for realizing reactive power compensation and a first capacitor group connected in series with the first reactor and connected in series to the handcart circuit breaker; a second capacitor cabinet arranged adjacent to the first capacitor cabinet, wherein a bus bar passing through the first capacitor cabinet and the second capacitor cabinet is internally provided with a second reactor for realizing reactive power compensation and a second capacitor group connected in series with the second reactor and connected in series to the handcart circuit breaker; and an integrated base at the bottom of the feeder cabinet, the first capacitor cabinet and the second capacitor cabinet for preassembledly fixing them together, wherein each end of the integrated base is provided with a plurality of rollers for moving the outdoor type reactive power compensation device.

[0008] According to the outdoor type reactive power compensation device of the utility model, by means of the handcart circuit breaker with modular design, on the one hand, the automatic switching function of the multiple capacitor cabinets of the reactive power compensation device is met, and on the other hand, the requirement of providing an obvious disconnection point during equipment maintenance is met. Compared with the prior art, such design can cancel the disconnector, thereby reducing the size of the cabinet body and reducing the cost of the equipment.

[0009] Further, the utility model can be integrally transported, that is, the connection including the bus bar, the connecting cable and the rainproof cap between the feeder cabinet, the first capacitor cabinet and the second capacitor cabinet is completed in the preassembled manner in the factory and is tested and debugged. After the preassembled outdoor type reactive power compensation device is transported to the user site, after it is moved to the position, it can be put into use only by connecting to the primary power cable of the user end and connecting to the secondary control communication cable.

[0010] In some embodiments, the outdoor protection mechanism further includes: a rainproof cap arranged on the top of the feeder cabinet, the first capacitor cabinet and the second capacitor cabinet in a slope design; an air inlet part arranged at the lower part of the cabinet body of the first capacitor cabinet and the second capacitor cabinet; and an air outlet arranged at the end of the rainproof cap.

[0011] In some embodiments, the rainproof cap is designed as a double-layer structure with a heat-insulating air layer, and a first exhaust fan and a second exhaust fan are arranged for air circulation.

[0012] In some embodiments, the operating mechanism comprises a driving shaft connected to a vertically arranged connecting rod via a crank, and a main connecting rod connected between the connecting rod and the main connecting rod.

[0013] In some embodiments, each phase pole of the fixed sealing pole comprises two vacuum interrupters arranged in front and back and up and down, and connected in series as a double-break structure, the moving end of each vacuum interrupter is connected to an insulating pull rod, and the lower end of the insulating pull rod is connected to the main connecting rod.

[0014] In some embodiments, any one of the incoming line cabinet, the first capacitor cabinet and the second capacitor cabinet further comprises a grounding part below, wherein the grounding part is designed as a grounding bolt.

[0015] In some embodiments, the incoming line cabinet, the first capacitor cabinet and the second capacitor cabinet respectively comprise an incoming line cabinet door, a first capacitor cabinet door and a second capacitor cabinet door opened in the vertical direction, wherein the opening direction of the first capacitor cabinet door is designed to be opposite to the opening direction of the incoming line cabinet door of the incoming line cabinet.

[0016] In some embodiments, the first and second reactors are arranged overhead in the first and second capacitor cabinets, and the first and second capacitor groups are arranged on the ground in the first and second capacitor cabinets.

[0017] In some embodiments, the length of any one of the incoming line cabinet, the first capacitor cabinet, the second capacitor cabinet and the third cabinet of the outdoor type reactive power compensation device is configured to be between 1400-1600mm, and the width is between 2000-2400mm.

[0018] Some of the other features and advantages of the present application will be apparent to those skilled in the art upon reading the application, and others will be described in the detailed description below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0020] Figure 1 is a front view of the outdoor type reactive power compensation device according to the present application;

[0021] Figure 2 is a side view of the outdoor type reactive power compensation device according to the present application;

[0022] Figure 3 is a rear view schematic diagram of the outdoor type reactive power compensation device according to the present application;

[0023] Figure 4 is a top view schematic diagram of the outdoor type reactive power compensation device according to the present application;

[0024] Figure 5 is Figure 1 a top view schematic diagram of the outdoor type reactive power compensation device in

[0025] Figure 6 is Figure 1 a front view schematic diagram of the outdoor type reactive power compensation device in

[0026] BRIEF DESCRIPTION OF DRAWINGS

[0027] 100. outdoor type reactive power compensation device; 10. incoming line cabinet; 10A. phase A incoming line;

[0028] 10B. phase B incoming line; 10C. phase C incoming line; 11. incoming line cabinet door; 12. handcart circuit breaker;

[0029] 12A. solid-sealed pole; 13. busbar; 20. first capacitor cabinet;

[0030] 21. first capacitor cabinet door; 22. first capacitor group; 23. first reactor;

[0031] 30. second capacitor cabinet; 31. second capacitor cabinet door; 32. second capacitor group;

[0032] 33. second reactor; 40. integrated base; 41. roller; 42. grounding portion;

[0033] 43. air intake portion; 50. rain cap; 51A. first exhaust fan; 52A. second exhaust fan. DETAILED DESCRIPTION

[0034] With reference to the drawings, the schematic scheme of the outdoor type reactive power compensation device disclosed by the present application will be described in detail. Although the drawings are provided to present some embodiments of the present application, the drawings are not necessarily drawn according to the size of the specific embodiments, and some features can be enlarged, removed or partially cut to better show and explain the disclosure of the present application. Some components in the drawings can be adjusted in position according to actual needs without affecting the technical effects. The phrase "in the drawings" or similar language appearing in the specification does not necessarily refer to all drawings or examples.

[0035] Certain directional terms used in the following to describe the drawings, such as "inner", "outer", "above", "below" and other directional terms, will be understood to have their normal meaning and refer to those directions involved when normally looking at the drawings. Unless otherwise indicated, the directional terms described in this specification are in accordance with the conventional directions as understood by those skilled in the art.

[0036] The terms "first", "the first", "second", "the second", and similar terms used in the present utility model are not intended to indicate any order, number or importance in the present utility model, but are used to distinguish one component from other components.

[0037] In order to further understand the purpose, structure, features and functions of the present utility model, the following will be described in detail in the following embodiments.

[0038] In Figures 1-6 The outdoor type reactive power compensation device 100 according to the present utility model is shown in the drawings, which is used to be electrically connected to a three-phase power distribution system including phase A, phase B and phase C, which can be above 33kV, for example, to perform reactive power compensation (see Figures 5-6 In the embodiment shown here, the outdoor type reactive power compensation device 100 adopts a pre-assembled or integrated design, wherein the outdoor type reactive power compensation device 100 sequentially includes a plurality of electrical cabinets: a line-in cabinet 10, a first capacitor cabinet 20 arranged adjacent to the line-in cabinet 10, and a second capacitor cabinet 30 arranged adjacent to the first capacitor cabinet 20. In order to fix these electrical cabinets together in a pre-assembled manner, an integrated base 40, for example, configured as a recess, is provided at the bottom of them, and the internal profile of the recess of the integrated base 40 is designed to be conformal to the external profile of the cabinet body of these electrical cabinets, so that these electrical cabinets adjacent to each other are pre-assembled into an integrated body by means of the integrated base 40 at the bottom, and do not need to be assembled on site. In order to ensure the convenience of the outdoor type reactive power compensation device 100 in use, a plurality of rollers 41 are preferably added at each end of the integrated base 40 at the bottom, so as to allow the user to exert a certain force to move the outdoor type reactive power compensation device 100 as a whole. It should be pointed out that although three pre-assembled or integrated electrical cabinets are shown here, it is understandable that more electrical cabinets can be added to meet the actual on-site needs, which are also within the scope intended to be protected by the present application. Here, the plurality of electrical cabinets are connected by means of a seal.

[0039] Therefore, the outdoor type reactive power compensation device 100 according to the utility model can be moved flexibly on the user's site, for example, by means of an operator or a tractor to pull the integrated base 40 at the bottom to move to the position designated by the user, and then only need to electrically connect the outdoor type reactive power compensation device 100 to the primary power cable of the user end and signal connect the secondary control communication cable to put into use, which is very convenient and fast.

[0040] Referring to Figures 5-6 Each of the plurality of electrical cabinets can place different types of electrical devices to meet the technical requirements of the outdoor type reactive power compensation device. Since the outdoor type reactive power compensation device 100 is also used in outdoor environment, the outdoor environment makes the electrical cabinet need to face strict test in sealing. The seal between the electrical cabinets is distributed between two electrical cabinets adjacent to each other, which can seal the preassembled electrical cabinet well, thereby meeting the protection grade requirements of the outdoor type reactive power compensation device 100 to ensure the safe use of the outdoor type reactive power compensation device 100. Of course, the outdoor type reactive power compensation device 100 of the utility model can also meet the use requirements of indoor environment.

[0041] Generally, the operator can preassemble or integrate different specifications of electrical cabinets according to actual use requirements, and each electrical cabinet can accommodate electrical devices matched therewith. In this embodiment, the maximum non-detachable size of each electrical cabinet is, for example, 1400-1600mm (long) x 2000-2400mm (wide) x 3200mm (high). Of course, those skilled in the art can adaptively adjust the size of the electrical cabinet based on the teachings of the utility model, which does not depart from the scope of the utility model. When preassembling, a plurality of electrical cabinets are arranged in sequence side by side, and then the adjacent two electrical cabinet units are fixedly connected to each other. The electrical cabinet is generally a rectangular cabinet. By means of the seal between the electrical cabinets, the adjacent electrical cabinets can be sealed, so that the overall preassembled outdoor type reactive power compensation device 100 can meet the protection grade (such as outdoor IP55) and ensure the safe use of the full insulation cabinet type reactive power compensation device 10, especially when the outdoor type reactive power compensation device 100 is located outdoors.

[0042] Next, the various electrical cabinets and auxiliary mechanisms of the outdoor type reactive power compensation device 100 will be described in detail.

[0043] As Figures 1 to 3As shown, the outdoor type reactive power compensation device 100 is provided with a feeder cabinet 10 for electrically connecting to a three-phase power distribution system including A phase, B phase and C phase, for example, above 33kV, wherein the feeder cabinet 10 is provided with a feeder cabinet door 11 at the front side thereof to allow electrical devices to be moved in or out, and preferably provided with heat dissipation grilles at the upper and lower parts of the cabinet door. Here, the top cover and base of the feeder cabinet 10 can be made of one of aluminized zinc plate, composite plate or non-metal, having very strong anti-radiation, anti-blast and sunlight performance, good heat insulation capability, strong mechanical tensile and bending strength, good impact resistance, realizing factory prefabrication of the reactive power compensation device, shortening the design and manufacturing period, only a small amount of installation and debugging is required on site, shortening the construction period, short construction period, low operation cost.

[0044] As shown in Figures 5 to 6 , the base of the feeder cabinet 10 is provided with A phase feeder 10A, B phase feeder 10B and C phase feeder 10C respectively electrically connected to the three-phase power distribution system including A phase, B phase and C phase, wherein each of the A phase feeder 10A, B phase feeder 10B and C phase feeder 10C includes three contacts respectively connected to the A phase, B phase and C phase of the external power distribution system (not shown). Further, above the A phase feeder 10A, B phase feeder 10B and C phase feeder 10C in the cabinet body of the feeder cabinet 10 is further provided with a handcart circuit breaker 12 electrically connected thereto, wherein the handcart circuit breaker 12 is used as an obvious disconnection point in the entire electrical system for controlling the power-on or power-off of the outdoor type reactive power compensation device 100.

[0045] As a feasible way, as shown in Figure 1 and 5 -6, the handcart circuit breaker 12 includes a cart frame that can be pulled out from the feeder cabinet 10 when the feeder cabinet door 11 is in the open state shown in Figure 4 , and a housing made of, for example, insulating material mounted on the cart frame, wherein the housing is provided with an operating mechanism inside and a corresponding phase sealed pole 12A at the upper rear side of the housing, wherein the lower end of the sealed pole 12A is connected to the operating mechanism (not shown). Further, as shown in Figure 1As shown, the front upper part of the frame is provided with a handle for the operator to operate. Meanwhile, it is possible that the operating mechanism comprises a driving shaft, the driving shaft is connected with a longitudinally arranged connecting rod through a crank arm. Then, the longitudinally arranged connecting rod is connected with a transversely arranged large connecting rod, and the large connecting rod can be connected with the lower end of the fixed sealing pole 12A through a main connecting rod. Preferably, a screw rod is connected between the large connecting rod and the main connecting rod. Preferably, each phase pole of the fixed sealing pole 12A contains two 24kV vacuum interrupters arranged in front and back and up and down staggered and connected in series into a double-break structure, and the moving end of each vacuum interrupter is connected to an insulated pull rod, and the lower end of the insulated pull rod is connected to the main connecting rod. Preferably, each vacuum interrupter is provided with a voltage-sharing capacitor at both ends. The size of the handcart circuit breaker 12 is matched with the size of the incoming line cabinet.

[0046] When the handcart circuit breaker 12 is in the initial open state, the driving shaft is clockwise under the action of the closing spring in the operating mechanism, driving the crank arm and the connecting rod on it to move together, and the connecting rod has a downward movement tendency. The left end of the large connecting rod moves upward under the action of the fulcrum and the connecting rod, driving the rotating block and the screw rod installed thereon to move upward. The main connecting rod connects the lower end of the screw rod and the two insulated pull rods, so the two insulated pull rods also move upward synchronously, and the upper end of the two insulated pull rods is connected with the moving end of the two vacuum interrupters respectively. As a result, the moving end of the two vacuum interrupters drives the moving contact to move upward and contact with the static contact, thereby realizing the closing process of the handcart circuit breaker 12.

[0047] Then, the opening process of the handcart circuit breaker 12 is opposite to the closing process, which will not be repeated. It should be pointed out that in the above-mentioned opening and closing processes of the handcart circuit breaker 12, the main connecting rod plays a crucial role, and its two ends are connected with the lower end of the two insulated pull rods, thereby realizing the synchronous movement of the two vacuum interrupters driven by the two insulated pull rods, thereby ensuring the synchronization of the opening and closing of the break of the two vacuum interrupters, which provides a strong guarantee for the safe and reliable switching of the first capacitor bank 22 and the second capacitor bank 32 of the outdoor type reactive power compensation device 100.

[0048] Therefore, the outdoor type reactive power compensation device according to the present application meets the automatic switching function of multiple capacitor cabinets of the reactive power compensation device on the one hand, and also meets the requirement of providing a clear disconnection point during equipment maintenance on the other hand. Compared with the prior art, such design can cancel the disconnector, thereby reducing the size of the cabinet and reducing the cost of the equipment.

[0049] Optionally, a grounding switch is preferably provided on the cabinet wall of the incoming line cabinet 10 located on one side of the handcart circuit breaker 12, wherein the grounding switch is connected in series downstream of the handcart circuit breaker 12 to allow grounding of the electric circuit under preset conditions to ensure the work safety of the operator when moving the electrical device into or out of the outdoor type reactive power compensation device 100. Here, the grounding switch is electrically connected to the grounding part 42 designed as a grounding bolt located below the incoming line cabinet 10, so that a sufficiently high insulation level of the incoming line cabinet 10 is achieved in a low-cost manner, and the cabinet body of the incoming line cabinet 10 is not electrified at this time. As a result, a fence does not need to be installed at a certain distance around the cabinet body of the incoming line cabinet 10, thereby achieving the minimization of the land occupation and the minimization of the logistics size.

[0050] In order to facilitate the operator to know whether the outdoor type reactive power compensation device 100 is currently electrified, a live display is preferably also connected to the cabinet wall of the incoming line cabinet 10, wherein it is lit when the outdoor type reactive power compensation device 100 is in an electrified state, so as to improve the operation safety of the outdoor type reactive power compensation device 100.

[0051] As shown in Figure 1 , a first capacitor cabinet 20 is arranged next to the incoming line cabinet 10 and connected together with it, for example by means of a seal. As shown in Figures 5-6 , a first electric reactor 23 for realizing reactive power compensation and a first capacitor bank 22 connected in series therewith are built in the first capacitor cabinet 20. As shown in Figures 5-6 , it is better shown that each of the A phase, B phase and C phase is connected in series by means of a busbar 13 electrically connected to the handcart circuit breaker 12 located at the top of the cabinet body of the first capacitor cabinet 20. Here, a plurality of insulators are fixedly provided on the top wall of the incoming line cabinet 10 and the first capacitor cabinet 20, wherein the busbar 13 is suspended through the incoming line cabinet 10 and the first capacitor cabinet 20 and is electrically connected to the corresponding first electric reactor 23 and the first capacitor bank 22 connected in series therewith via a fuse not shown.

[0052] Optionally, the first electric reactor 23 is designed as an overhead arrangement. The first electric reactor 23 is also electrically connected to the first capacitor bank 22 which will be described in detail later, for suppressing the amplification of high-order harmonics of the power grid system and limiting the capacitor closing inrush current. Specifically, the first electric reactor 23 is used to suppress the 5th, 7th and higher harmonics with a reactance rate of 5% to 6%, and is used to suppress the 3rd and higher harmonics with a reactance rate of 12% to 13%. According to different harmonic configurations of the user's on-site system, the electric reactor with different reactance rates limits the closing inrush current and suppresses the harmonic current of the system.

[0053] Further, in the first capacitor cabinet 20, three first capacitor banks 22 for A phase, B phase and C phase respectively are also built-in and connected to the first reactor 23, specifically, the A phase capacitor bank, the B phase capacitor bank and the C phase capacitor bank are each connected in a double star type. Specifically, each of the A phase capacitor bank, the B phase capacitor bank and the C phase capacitor bank includes a plurality of capacitors connected in series with each other and each of the capacitor banks is connected to a corresponding phase among the A phase, the B phase and the C phase respectively. In this regard, the capacitor banks 22 are used to provide capacitive reactive power to compensate for inductive reactive power in the system, to improve the power factor of the power grid, to improve the distribution voltage quality, to reduce the loss, to increase the supply capacity of the power equipment, and to obtain safe, reliable and economic operation of the distribution system.

[0054] It is feasible that the capacitor banks 22 are designed to have an insulation level of 70 / 170 kV or above and are designed to be floor-mounted. In this way, on the one hand, the insulation platform composed of a steel frame and a support insulator arranged in the first capacitor cabinet 20 can be omitted, resulting in a large size of the capacitor cabinet, and on the other hand, the hoisting and fixing installation steps required for placing the capacitor banks on the insulation platform can be omitted. Moreover, even if the outdoor type reactive power compensation device 100 of the utility model is designed for outdoor use, since it already has a high enough insulation level, the shell of the first capacitor cabinet 20 will not be electrified at this time, and therefore a fence does not need to be installed within a certain distance around the cabinet body, thereby realizing the minimization of the occupied area and the minimization of the logistics size.

[0055] In this regard, in the utility model, the spacing between the capacitor banks 22 is designed to be not less than 320 mm. For this purpose, each capacitor in the capacitor bank 22 is respectively wound with a film-paper composite insulation structure composed of a polypropylene film and a cable paper, wherein the number of layers of the polypropylene film and the cable paper is more than 20 layers and the outermost layer is the cable paper. Based on such a design, the capacitors in the capacitor bank 22 are strengthened in the parts where the capacitance is too small or the field intensity is concentrated, and the deficiency of the small main insulation of the capacitors is solved by means of the composite insulation structure, so that the capacitors can meet the requirement of having an insulation level of 70 / 170 kV or above and being designed to be floor-mounted.

[0056] In order to facilitate the installation of the first reactor 23 and the first capacitor bank 22 in the first capacitor cabinet 20, as shown in FIG. 1, the first capacitor cabinet 20 is designed to have a plurality of installation holes 21 arranged on the top surface of the cabinet body. Figures 1 to 4As shown in the figure, the front of the first capacitor cabinet 20 is provided with a first capacitor cabinet door 21 which can be opened in the vertical direction, wherein the opening direction of the first capacitor cabinet door 21 is preferably designed to be opposite to the opening direction of the incoming line cabinet door 11 of the incoming line cabinet 10, which effectively saves the front space occupied by the outdoor type reactive power compensation device 100. Preferably, an observation window is provided at the upper part of the first capacitor cabinet door 21 for the operator to observe the working state of the electrical components in the capacitor cabinet. Here, the top cover and base of the first capacitor cabinet 20 can also be made of one of the following: aluminum-zinc coated plate, composite plate or non-metal, which has very strong anti-radiation, anti-baking performance, good heat insulation capacity, strong mechanical tensile and bending strength, good impact resistance, realizes factory prefabrication of the reactive power compensation device, shortens the design and manufacturing cycle, only a small amount of installation and debugging is required on site, shortens the construction period, shortens the construction period, and reduces the operation cost.

[0057] As shown in the figure, Figure 1 immediately adjacent to the first capacitor cabinet 20 is arranged a second capacitor cabinet 30 which is connected together, for example, by means of a seal, wherein as shown in the figure, Figures 5-6 a second reactor 33 for realizing reactive power compensation and a second capacitor bank 32 connected in series therewith are built-in in the second capacitor cabinet 30. As shown better, Figures 5-6 herein for each of the A-phase, B-phase and C-phase is connected in series by means of a busbar 13 located at the top of the cabinet body of the second capacitor cabinet 30 and electrically connected to the handcart circuit breaker 12. Herein, a plurality of insulators are fixedly provided on the top walls of the first capacitor cabinet 20 and the second capacitor cabinet 30, wherein the busbar 13 is suspended through the first capacitor cabinet 20 and the second capacitor cabinet 30 and is electrically connected to the corresponding second reactor 33 and the second capacitor bank 32 connected in series therewith via a fuse not shown.

[0058] feasible, herein the second reactor 33 is designed to be arranged overhead. Herein the second reactor 33 will also be electrically connected to the second capacitor bank 32 which will be described in detail later, for suppressing the amplification of high-order harmonics of the power grid system and limiting the capacitor closing inrush current. Specifically, herein the second reactor 33 is used to suppress 5, 7 and above harmonics with a reactance rate of 5% to 6%, and is used to suppress 3 and above harmonics with a reactance rate of 12 to 13%, according to the different harmonic configuration of the user site system, the reactor with different reactance rate is used to limit the closing inrush current and suppress the harmonic current of the system.

[0059] Further, in the second capacitor cabinet 30, three second capacitor banks 32 for A phase, B phase and C phase respectively are also built-in and connected to the second reactor 33, and specifically, the A phase capacitor bank, the B phase capacitor bank and the C phase capacitor bank are each connected in a double star type. Specifically, each of the A phase capacitor bank, the B phase capacitor bank and the C phase capacitor bank includes a plurality of capacitors connected in series with each other and each of the capacitor banks is connected to a corresponding phase among the A phase, the B phase and the C phase respectively. In this regard, the capacitor banks are used to provide capacitive reactive power to compensate for inductive reactive power in the system, to improve the power factor of the power grid, to improve the voltage quality of power distribution, to reduce loss, to increase the supply capacity of power equipment, and to achieve safe, reliable and economical operation of the power distribution system.

[0060] In order to facilitate the installation of the second reactor 33 and the second capacitor bank 32 in the second capacitor cabinet 30, as shown in Figures 1 to 4 , the front of the second capacitor cabinet 30 is provided with a second capacitor cabinet door 31 which can be opened in the vertical direction, and the opening direction of the second capacitor cabinet door 31 is preferably designed to be the same as the opening direction of the first capacitor cabinet door 21 of the first capacitor cabinet 20, which effectively saves the front space occupied by the outdoor type reactive power compensation device 100. Preferably, an observation window is also provided at the upper part of the second capacitor cabinet door 31 for an operator to observe the working state of the electrical components in the capacitor cabinet. Here, the top cover and the base of the second capacitor cabinet 30 can also be made of one of the following materials: aluminum-zinc coated plate, composite plate or non-metal, which has very strong anti-radiation, anti-blast and anti-solarization performance, good heat insulation capability, strong mechanical tensile and bending strength, and good impact resistance, thereby realizing factory prefabrication of the reactive power compensation device, shortening the design and manufacturing cycle, requiring only a small amount of installation and debugging on site, shortening the construction period, and reducing the operation cost.

[0061] In order to ensure that the outdoor type reactive power compensation device 100 according to the present application can work stably for a long time outdoors, the outdoor type reactive power compensation device 100 further has an outdoor protection mechanism. The outdoor protection mechanism includes a rainproof cap 50 extending through the top of the three cabinets, i.e., the incoming line cabinet 10, the first capacitor cabinet 20 and the second capacitor cabinet 30, which are pre-assembled or integrated together, and as shown in Figure 2 , the rainproof cap 50 has a slope design extending beyond the electrical cabinet bodies along the depth direction of the cabinet bodies, so that the rainwater falling on the rainproof cap 50 can be guided away from the electrical cabinet bodies along the slope.

[0062] Further, as shown in Figure 2 Figure 2 , the rainproof cap 50 is preferably designed as a double-layer structure, i.e., a heat-insulating air layer is provided in the middle of the rainproof cap 50 to form air convection, thereby effectively preventing sunlight radiation and achieving the purposes of heat insulation, air exhaust and cooling.

[0063] Preferably, in order to ensure that the first capacitor cabinet 20 and the second capacitor cabinet 30 are at a predetermined temperature and air humidity, a first exhaust fan 51A and a second exhaust fan 52A are correspondingly arranged in a rainproof cap 50 above the first capacitor cabinet 20 and the second capacitor cabinet 30. Taking the first capacitor cabinet 20 as an example, a corresponding air inlet part 43 for external air inflow is arranged at the lower part of the rear side wall of the first capacitor cabinet 20, wherein the air inlet part 43 is provided with a protective cover for air inflow only to avoid external rain, dust or small animals from entering the first capacitor cabinet 20 unrestrictedly. At the same time, an air outlet is arranged downstream of the rear side of the first exhaust fan 51A in the rainproof cap 50. As a result, with the first exhaust fan 51A being started, external air is sucked into the interior of the first capacitor cabinet 20 from the air inlet part 43 under the pumping action of the first exhaust fan 51A, thereby realizing cooling and insulation of the cabinet including the first reactor 23 and the first capacitor bank 22, and then the air flow is sucked into the rainproof cap 50 in which the first exhaust fan 51A is arranged and is circulated out of the exterior of the first capacitor cabinet 20 through the air outlet, so as to ensure air circulation in the cabinet and form a ventilated environment. The same structure also exists in the second capacitor cabinet 30, which will not be described here.

[0064] Therefore, the outdoor type reactive power compensation device 100 has a good ventilation and heat dissipation system, and through the slope design, the heat insulation air layer and the ventilation port in the rainproof cap 50, the natural ventilation and forced ventilation are combined, and good ventilation and heat dissipation effects are achieved.

[0065] In summary, the outdoor type reactive power compensation device 100 can be transported integrally, that is, the connection between the incoming line cabinet 10, the first capacitor cabinet 20 and the second capacitor cabinet 30 including the busbar, the connecting cable and the rainproof cap is tested, debugged and completed in a preassembled manner in the factory. After the preassembled outdoor type reactive power compensation device 100 is transported to the user site, it only needs to be connected to a primary power cable and a secondary control communication cable for signal connection after being moved into position, and can be put into use.

[0066] It should be understood that although the present specification is described in terms of various embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0067] The above merely illustrates the specific implementation of the present application, and is not intended to limit the scope of the present application. Any equivalent changes, modifications and combinations made by any person skilled in the art without departing from the concept and principles of the present application shall fall within the scope of the present application.

Claims

1. An outdoor reactive power compensation device, which is used to electrically connect a three-phase power distribution system including phases A, B and C for reactive power compensation, characterized in that The outdoor reactive power compensation device includes: An incoming line cabinet having an incoming line connector electrically connected to a three-phase power distribution system comprising phases A, B, and C, and a trolley circuit breaker electrically connected to the incoming line connector. The trolley circuit breaker comprises a frame that can be pulled out of the incoming line cabinet and a housing mounted on the frame. An operating mechanism is disposed within the housing, and a sealed pole corresponding to the corresponding phase is disposed at the upper rear portion of the housing. The lower end of the sealed pole is operatively connected to the operating mechanism. A first capacitor cabinet arranged adjacent to the incoming line cabinet has a built-in first reactor for reactive power compensation and a first capacitor bank connected in series to the trolley circuit breaker via a busbar passing through the incoming line cabinet and the first capacitor cabinet; a second capacitor cabinet arranged adjacent to the first capacitor cabinet, wherein a second reactor for achieving reactive power compensation and a second capacitor bank connected in series to the trolley circuit breaker via a busbar passing through the first capacitor cabinet and the second capacitor cabinet are built in; and An integrated base is located at the bottom of the incoming line cabinet, the first capacitor cabinet and the second capacitor cabinet for pre-installing and fixing them together, wherein each end of the integrated base is provided with a plurality of rollers for moving the outdoor reactive compensation device.

2. The outdoor reactive power compensation device according to claim 1, characterized in that: Also included are outdoor protection agencies, including: A sloped rain cap located on top of the incoming line cabinet, the first capacitor cabinet, and the second capacitor cabinet that are pre-assembled and fixed together; an air inlet located at the lower portion of the first capacitor cabinet and the second capacitor cabinet; and The exhaust vent is located at the end of the rain cap.

3. The outdoor reactive power compensation device according to claim 2, characterized in that: The rainproof hat is designed as a double-layer structure with a heat-insulating air layer inside, and is also provided with a first exhaust fan and a second exhaust fan for achieving air circulation.

4. The outdoor reactive power compensation device according to claim 1, wherein: Wherein the operating mechanism comprises: A drive shaft, which is designed to be connected to a longitudinally arranged connecting rod via a crank arm; and A large connecting rod is operatively connected between the connecting rod and the main connecting rod, wherein the other end of the main connecting rod is operatively connected to the lower end of the sealed pole.

5. The outdoor reactive power compensation device according to claim 4, characterized in that: Each phase pole of the sealed pole contains two vacuum interrupters that are staggered front and back and up and down and connected in series to form a double-break structure. The moving end of each vacuum interrupter is connected to an insulating pull rod and the lower end of the insulating pull rod is connected to a main connecting rod.

6. The outdoor reactive power compensation device according to claim 1, characterized in that: Any one of the incoming line cabinet, the first capacitor cabinet, and the second capacitor cabinet further includes a grounding portion located below, wherein the grounding portion is designed as a grounding bolt.

7. The outdoor reactive power compensation device according to claim 1, characterized in that: The incoming cabinet, the first capacitor cabinet and the second capacitor cabinet respectively include an incoming cabinet door, a first capacitor cabinet door and a second capacitor cabinet door that open in a vertical direction, wherein the opening direction of the first capacitor cabinet door is designed to be opposite to the opening direction of the incoming cabinet door of the incoming cabinet.

8. The outdoor reactive power compensation device according to claim 1, wherein: The first reactor and the second reactor are arranged overhead in the first capacitor cabinet and the second capacitor cabinet, and the first capacitor group and the second capacitor group are arranged on the ground in the first capacitor cabinet and the second capacitor cabinet.

9. The outdoor reactive power compensation device according to claim 1, wherein: The length of any one of the incoming cabinet, the first capacitor cabinet, and the second capacitor cabinet of the outdoor reactive power compensation device is configured to be between 1400 and 1600 mm and the width is configured to be between 2000 and 2400 mm.

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