A modular fully enclosed insulating switchgear

Abstract

The modular fully enclosed insulated switchgear provided in this application relates to the field of electrical switchgear. The modular fully enclosed insulated switchgear comprises: a main air chamber module, an operating mechanism module, a plug-in solid insulated busbar module, a three-position disconnector, a metal box, a transmission device and a solid insulated inner cone plug interface; wherein, the plug-in solid insulated busbar module comprises a plurality of fully solid insulated U-shaped conductors, both ends of the U-shaped conductor are provided with solid insulated outer cone plug connectors, the solid insulated outer cone plug connector at one end of the U-shaped conductor is used to connect to the solid insulated inner cone plug interface of the modular fully enclosed insulated switchgear, and the solid insulated outer cone plug connector at the other end is used to connect to the solid insulated inner cone plug interface of the adjacent modular fully enclosed insulated switchgear. It is used to solve the technical problems in the prior art that the switchgear is difficult to install and disassemble independently, is not conducive to transportation and installation in a small space, and is particularly difficult to maintain due to faults.

Description

Technical Field

[0001] The present application relates to the field of electrical switchgear, and in particular to a modular fully enclosed insulating switchgear. Background Art

[0002] Switchgear is a key electrical equipment in the power supply industry. The complex environment and harsh climatic conditions in plateaus or mountainous areas have a great impact on the installation, operation and maintenance of electrical equipment such as switchgear in railway projects.

[0003] Currently, the commonly used switchgear is the gas-insulated switchgear. The gas-insulated switchgear seals the switches, current transformers and related conductors in multiple inseparable insulating gas tanks, making the single device heavy. The busbar connection between the cabinets adopts a through-plug method, which is not easy to install and disassemble independently. This is not conducive to the transportation and installation of the switchgear in a small space, and fault maintenance is particularly difficult. Summary of the Invention

[0004] In order to solve the technical problem in the related technology of switch cabinets that the cabinet connection method is relatively cumbersome, not only requiring a large number of additional parts, but also difficult to disassemble and not conducive to the maintenance of the switch cabinet, the present application provides a modular fully enclosed insulated switch cabinet.

[0005] The modular fully enclosed insulated switchgear provided in this application includes: a main air chamber module, an operating mechanism module, a plug-in solid insulated busbar module, a three-position disconnector, a metal box, a transmission device and a solid insulated inner cone plug interface;

[0006] The circuit breaker, current transformer and connecting copper bar in the main gas chamber module are arranged in the metal box through a solid insulated inner cone plug interface;

[0007] The operating mechanism module is connected to the circuit breaker through the transmission device, and the operating mechanism module is used to control the circuit breaker;

[0008] The plug-in solid insulated busbar module includes a plurality of fully solid-insulated U-shaped conductors, each of which is provided with a solid-insulated outer-cone plug connector at both ends. The solid-insulated outer-cone plug connector at one end of the U-shaped conductor is used to connect to the solid-insulated inner-cone plug connector, and the solid-insulated outer-cone plug connector at the other end is used to connect to the solid-insulated inner-cone plug connector of an adjacent modular fully enclosed insulated switchgear.

[0009] The first end contact of the three-position disconnector is connected to the solid-insulated inner cone plug interface, the second end contact is connected to the connector of the circuit breaker, and the third end contact is connected to the grounding terminal; when the moving contact in the three-position disconnector is connected to the first end contact and the second end contact, the main electrical circuit of the modular fully enclosed insulating switch cabinet is in a conducting state; when the moving contact in the three-position disconnector is connected to the second end contact and the third end contact, the modular fully enclosed insulating switch cabinet is in a grounding state; when the moving contact in the three-position disconnector is only connected to the second end contact, the main electrical circuit is in a disconnected state.

[0010] As an optional implementation of the embodiment of the present application, the modular fully enclosed insulating switchgear is a single-pole switchgear, and the modular fully enclosed insulating switchgear is connected to adjacent modular fully enclosed insulating switchgear in a staggered step-by-step manner through the plug-in solid insulated busbar module, wherein a gap of a preset distance is left between adjacent modular fully enclosed insulating switchgear;

[0011] Alternatively, the modular fully enclosed insulated switchgear is a multi-pole switchgear, and the modular fully enclosed insulated switchgear is connected to adjacent modular fully enclosed insulated switchgear in an oblique parallel manner through the plug-in solid insulated busbar module, wherein a gap of a preset distance is left between adjacent modular fully enclosed insulated switchgear.

[0012] As an optional implementation of the embodiment of the present application, the three-position disconnect switch is integrated with the circuit breaker, the circuit breaker and the current transformer are connected in series through the connecting copper bus, and the circuit breaker is electrically connected in series with the solid insulation inner cone plug interface.

[0013] As an optional implementation of the embodiment of the present application, the three-position isolating switch is a plug-in isolating switch, which is externally placed on the top of the metal box. The plug-in isolating switch includes: an outer cone plug-in connector, two inner cone plug-in connectors and a vacuum air chamber; the plug-in isolating switch is connected to the main air chamber module through the outer cone plug-in connector, and the inner cone plug-in connector is used to connect the knife switch of the three-position isolating switch.

[0014] As an optional implementation of the embodiment of the present application, the plug-in disconnector is rotated using a T-type electrode or an anchor-type electrode.

[0015] As an optional implementation of the embodiment of the present application, the modular fully enclosed insulated switchgear further includes: a gas pressure stabilization module;

[0016] The gas pressure stabilization module is externally disposed at the bottom or top of the metal box and is in communication with the metal box for regulating the gas pressure in the metal box.

[0017] As an optional implementation of the embodiment of the present application, the modular fully enclosed insulated switchgear further includes: a secondary circuit interface module;

[0018] The secondary circuit interface module is located on the top of the modular fully enclosed insulating switch cabinet and is configured as a matrix plug interface for connecting and communicating with secondary equipment.

[0019] As an optional implementation of the embodiment of the present application, the modular fully enclosed insulated switchgear further includes: a plug-in lightning arrester module;

[0020] The plug-in arrester module includes a plug-in arrester and a plug-in voltage transformer.

[0021] The plug-in arrester is vertically installed on one side of the plug-in arrester module, or horizontally installed on the top of the plug-in arrester module.

[0022] As an optional implementation of the embodiment of the present application, the modular fully enclosed insulated switchgear further includes: a connection module;

[0023] The connection module includes a first connection unit and a second connection unit, the first connection unit includes a plurality of clips and hinges, and the connection plate is connected to the first connection unit by welding the clips to the first connection unit; the first connection unit and the second connection unit are provided on the front cabinet surface, the top cabinet surface and the back cabinet surface of the modular fully enclosed insulating switchgear, wherein the first connection unit and the second connection unit on the same cabinet surface are arranged in relative positions, and the first connection unit of the modular fully enclosed insulating switchgear is used to be connected to the second connection unit of the adjacent modular fully enclosed insulating switchgear, or the second connection unit of the modular fully enclosed insulating switchgear is connected to the first connection unit of the adjacent modular fully enclosed insulating switchgear.

[0024] As an optional implementation of the embodiment of the present application, the modular fully enclosed insulated switchgear adopts a bottom incoming and outgoing line mode, and the solid insulated inner cone plug interface is arranged at the bottom of the metal box;

[0025] Alternatively, the modular fully enclosed insulated switchgear adopts a top-input and top-output mode, and the solid-insulated inner cone plug interface is arranged on the top of the metal box;

[0026] Alternatively, the modular fully enclosed insulated switchgear adopts a side-input and side-output method, and the solid-insulated inner cone plug interface is arranged on the side of the metal box.

[0027] Compared with the prior art, this application has the following beneficial effects:

[0028] The modular fully enclosed insulated switchgear provided in the present application includes a main gas chamber module, an operating mechanism module, a plug-in solid insulated busbar module, a three-position disconnector, a metal box, a transmission device and a solid insulated inner cone plug interface; wherein, the circuit breaker, current transformer and connecting copper bus in the main gas chamber module are arranged in the metal box through the solid insulated inner cone plug interface; the operating mechanism module is connected to the circuit breaker through the transmission device, and the operating mechanism module is used to control the circuit breaker; the plug-in solid insulated busbar module includes a plurality of fully solid-insulated U-shaped conductors, and the two ends of the U-shaped conductor are set as solid-insulated outer cone plug connectors, and the solid insulated outer cone plug connector at one end of the U-shaped conductor is used to connect to the solid insulated inner cone plug connector. The first static contact of the three-position disconnector is connected to the solid-insulated inner-cone plug-in interface, the second static contact is connected to the connector of the circuit breaker, and the third static contact is connected to the grounding terminal. When the movable contact of the three-position disconnector is connected to the first static contact and the second static contact, the main electrical circuit of the modular fully enclosed insulated switchgear is in a conducting state. When the movable contact is connected to the second static contact and the third static contact, the modular fully enclosed insulated switchgear is in a grounding state. When the movable contact is connected to the second static contact and the third static contact, the modular fully enclosed insulated switchgear is in a disconnected state. In an embodiment of the present application, the equipment and conductors constituting the modular fully enclosed insulated switchgear are optimized into multiple modules according to their functions. The modules can be easily assembled and disassembled. The modules and switchgear are connected by using solid-insulated outer-cone plug-in interfaces and solid-insulated inner-cone plug-in interfaces, thereby achieving the effect of easy and quick replacement and maintenance. And because the two ends of the U-shaped conductor provided in the embodiment of the present application are set as solid-insulated outer cone plug connectors, and the modular fully enclosed insulated switch cabinet is provided with a solid-insulated inner cone plug interface, the modular fully enclosed insulated switch cabinet can be combined with the adjacent modular fully enclosed insulated switch cabinet through the U-shaped conductor, which simplifies the cabinet combination operation. In addition, on the one hand, the U-shaped conductor and the modular fully enclosed insulated switch cabinet are connected through the solid-insulated outer cone plug connector and the solid-insulated inner cone plug interface, which is easy to disassemble, reducing the difficulty of repairing and inspecting the modular fully enclosed insulated switch cabinet. On the other hand, the modular fully enclosed insulated switch cabinet provided in the embodiment of the present application realizes modularization, and each module can be disassembled, which also reduces the difficulty of repairing the modular fully enclosed insulated switch cabinet and improves maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1A A schematic structural diagram of a modular fully enclosed insulated switchgear cabinet provided in one embodiment of the present application;

[0032] Figure 1B A side view of a modular fully enclosed insulating switchgear provided in one embodiment of the present application;

[0033] Figures 2A1-2B3 A schematic structural diagram of a modular fully enclosed insulated switchgear provided for one or more embodiments of the present application;

[0034] Figure 3A A rear view of a single-stage modular fully enclosed insulating switchgear provided in one embodiment of the present application;

[0035] Figure 3B A top view of a single-pole switchgear provided in one embodiment of the present application;

[0036] Figure 4 A top view of a single-pole switchgear cabinet structure provided in one embodiment of the present application;

[0037] Figure 5A A rear view of a two-stage modular fully enclosed insulating switchgear provided in one embodiment of the present application;

[0038] Figure 5B A top view of a bipolar modular fully enclosed insulating switchgear provided in one embodiment of the present application;

[0039] Figure 6 A top view of a double-pole switch cabinet provided in one embodiment of the present application;

[0040] Figure 7 A top view of a three-pole switchgear cabinet provided in one embodiment of the present application;

[0041] Figure 8A A front view of a cabinet combining structure provided in one embodiment of the present application;

[0042] Figure 8B A top view of a cabinet combining structure provided in one embodiment of the present application. DETAILED DESCRIPTION

[0043] In order to more clearly understand the above-mentioned objectives, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0044] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present application may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present application, rather than all of the embodiments.

[0045] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0046] First, the application scenarios of the embodiments of the present application are described illustratively. The following scenarios are shown only as examples and do not limit the application scenarios of the embodiments of the present application. The complex environment and harsh climatic conditions in plateau or mountainous areas have a significant impact on the installation, operation, and maintenance of electrical equipment in railway projects. In particular, in the difficult and mountainous areas of the plateau, the proportion of tunnels is high, and the traction power supply facilities along the line need to be arranged near the tunnel entrance or in the tunnel cavern. However, the environmental conditions near the tunnel entrance are poor, transportation is difficult, and the space in the tunnel cavern is limited, which poses great challenges to equipment stability, equipment layout, transportation, replacement and maintenance. The currently commonly used gas-insulated switchgear seals the switches, current transformers, and related conductors in multiple inseparable insulating gas tanks. The weight of each single device is large, and the busbar connection between the cabinets adopts a through-plug method, which is not easy to disassemble and assemble independently, is not conducive to transportation and installation in a small space, and fault maintenance is particularly difficult. In addition, the switchgear generally uses the bottom of the cabinet for cable entry and exit, which requires a high space for equipment installation and entry and exit, and the civil engineering interface engineering is complex. It is difficult to apply in scenarios such as complex environmental conditions and small space.

[0047] In many application scenarios, multiple switchgear cabinets need to be combined. In related technologies, the structure of the switchgear itself requires busbars to be installed on the side of the cabinet for connection. Alternatively, this can be achieved by installing combination bars, combination bars, and combination holes on the combination bars on the combination surfaces of the switchgear cabinets. Alternatively, connection plates, connection slots, and connection columns can be installed on the combination surfaces of the switchgear cabinets to achieve combination.

[0048] The cabinet combination method in the related art is relatively cumbersome, not only requiring a large number of additional parts, but also difficult to disassemble, not conducive to the maintenance of the switch cabinet, and it is difficult to ensure the flatness of the cabinet when multiple cabinets are combined.

[0049] Based on this, this application proposes a modular, fully enclosed, insulated switchgear. This modular, fully enclosed, insulated switchgear optimizes the equipment and conductors that make up the switchgear into multiple modules according to their functions. The modules can be easily assembled and disassembled, and the modules and switchgear are connected using solid-insulated outer-cone plug connectors and solid-insulated inner-cone plug connectors, thereby achieving easy and rapid replacement and maintenance. A method for combining cabinets is also proposed, with gaps set between adjacent switchgear to facilitate replacement of the entire switchgear.

[0050] The modular fully enclosed insulating switchgear provided in this application is exemplified below through several specific embodiments.

[0051] Reference Figure 1A As shown, Figure 1A This is a schematic diagram of the structure of a modular fully enclosed insulated switchgear provided in one embodiment of the present application. Figure 1B The modular fully enclosed insulated switchgear includes: main air chamber module, operating mechanism module ( Figure 1A Not shown, Figure 1B 12), plug-in solid insulated busbar module (13, Figure 1A ), as well as a three-position disconnect switch 14, a metal box 15, a transmission device 16 and a solid insulation inner cone plug interface 17.

[0052] The main air chamber module includes a circuit breaker 111, a current transformer 112, a connecting copper busbar 113, and a solid-insulated inner-conical plug-in interface 17. Multiple solid-insulated inner-conical plug-in interfaces are provided, but are not individually identified in the accompanying drawings. The circuit breaker 111, current transformer 112, and connecting copper busbar 113 are mounted within the metal housing 15 via the solid-insulated inner-conical plug-in interfaces 17.

[0053] Optionally, the metal box 15 is further provided with a gas charging and discharging port 151 for charging or discharging the metal box. The metal box 15 is filled with an insulating gas, which may be an insulating gas such as SF6, nitrogen, dry air, or a mixed insulating gas composed of multiple insulating gases such as SF6, nitrogen, and dry air in a predetermined ratio.

[0054] The operating mechanism module is connected to the circuit breaker 111 via a transmission device 16 , and the operating mechanism module is used to control the opening or closing of the circuit breaker 111 .

[0055] The three-position disconnect switch can be integrated with the circuit breaker or can be separated from the circuit breaker 111 .

[0056] Reference Figure 1AAs shown, the three-position disconnect switch 14 is integrally connected to the circuit breaker 111. The circuit breaker 111 and the current transformer 112 are connected in series via the connecting copper busbar. The circuit breaker is electrically connected in series with the solid-insulated inner cone plug-in interface. The operating mechanism module 12 is used to control the conduction and closing of the circuit breaker 111.

[0057] The three-position disconnector includes three static contacts (a first static contact, a second static contact, and a third static contact) and one moving contact. The first static contact is used to connect to the solid-insulated inner cone-shaped plug socket, the second static contact is used to connect to the connector of the circuit breaker, and the third static contact is used to connect to the grounding terminal. When the moving contact of the three-position disconnector connects to the first and second static contacts, the main electrical circuit of the modular fully enclosed insulated switchgear is in the on state. When the moving contact connects to the second and third static contacts, the modular fully enclosed insulated switchgear is in the grounding state. When the moving contact connects only to the second static contact, the main electrical circuit is in the off state.

[0058] Optional, see Figures 2A1-2A3 As shown, the three-position disconnector 14 is built into a modular fully enclosed insulating switch cabinet and is separated from the circuit breaker 111. Figure 2A1 The three-position isolating switch is a connection diagram of three static contacts when the main electrical circuit of the modular fully enclosed insulating switchgear is in a conducting state; Figure 2A2 The three-position disconnector is a connection diagram of three static contacts when the modular fully enclosed insulating switch cabinet is in a grounded state; Figure 2A3 The three-position disconnector is a schematic diagram of the connection of three static contacts when the main electrical circuit of the modular fully enclosed insulating switchgear is in a disconnected state; Figures 2A1-2A3 The contacts of the three-position disconnector are shown in anchor shape. Figure 2A1 141 is a first static contact, 142 is a second static contact, and 143 is a ground terminal.

[0059] Optionally, the modular fully enclosed insulated switchgear further includes: a gas pressure stabilizing module 18; the gas pressure stabilizing module 18 is externally located at the bottom or top of the metal box, communicated with the metal box 15, and used to regulate the gas pressure in the metal box. Figure 1A As shown, the gas pressure stabilization module 18 is externally placed at the bottom of the metal box as an example.

[0060] Specifically, the gas pressure stabilization module 18 is connected to the metal housing 15 to form a completely enclosed air chamber. The gas pressure within the metal housing 15 is consistent with the internal pressure of the gas pressure stabilization module 18. The gas pressure stabilization module can contract or expand based on the air pressure, thereby regulating the gas pressure within the metal housing. When the modular fully enclosed insulated switchgear is exposed to different ambient atmospheric pressures, the gas pressure stabilization module dynamically adjusts the gas pressure within the metal housing by contracting and expanding the bellows material surrounding the air cavity, maintaining a constant pressure difference between the internal and external air pressures of the metal housing, thereby improving the durability of the modular fully enclosed insulated switchgear.

[0061] Optionally, the modular fully enclosed insulated switch cabinet further includes: a plug-in arrester module 19, the plug-in arrester module including a plug-in arrester 191 and a plug-in voltage transformer 192, Figure 1A As shown, the plug-in arrester 191 is vertically installed on one side of the plug-in arrester module and is directly plugged into the solid-insulated inner-cone plug-in interface on the bottom of the main air chamber module through a solid-insulated outer-cone plug-in connector. Figures 2A1-2A3 As shown, the plug-in arrester 191 is horizontally installed on the top of the plug-in arrester module and is directly plugged into the solid-insulated inner-cone plug interface on the side of the main air chamber module through a solid-insulated outer-cone plug connector.

[0062] Optionally, the three-position isolating switch can be a plug-in isolating switch, which is externally placed on the top of the metal box. The plug-in isolating switch includes: an outer cone plug-in connector, two inner cone plug-in connectors and a vacuum air chamber; the plug-in isolating switch is connected to the main air chamber module through the outer cone plug-in connector, and the inner cone plug-in connector is used to connect the knife switch of the three-position isolating switch.

[0063] Wherein, the plug-in disconnector adopts T-type electrode for rotation, or adopts anchor type electrode for rotation, referring to Figures 2B1-2B3 As shown, Figures 2B1-2B3 Taking the plug-in disconnector with T-type electrode for rotation as an example, the three-position disconnector can be used as a separate separate switch to achieve easy installation, disassembly and maintenance of the three-position disconnector. Figure 2B1 The three-position isolating switch is a connection diagram of three static contacts when the main electrical circuit of the modular fully enclosed insulating switchgear is in a conducting state; Figure 2B2 The three-position disconnector is a connection diagram of three static contacts when the modular fully enclosed insulating switch cabinet is in a grounded state; Figure 2B3 The three-position disconnector is a schematic diagram of the connection of three static contacts when the main electrical circuit of the modular fully enclosed insulated switch cabinet is in the disconnected state. Figures 2B1-2B3141 is a first static contact, 142 is a second static contact, and 143 is a ground terminal.

[0064] Compared to related art, the installation position of the plug-in arrester 191 in the embodiment of the present application fully utilizes the vacant space of the plug-in arrester module 19, eliminating the need to set up additional installation space for the plug-in arrester. This reduces the volume of the modular fully enclosed insulated switchgear, facilitating transportation and installation. The modules are connected by insulating waterproof strips 10.

[0065] Optionally, the modular fully enclosed insulated switch cabinet further includes: a secondary circuit interface module 20; the secondary circuit interface module 20 is located at the top of the modular fully enclosed insulated switch cabinet and is configured as a matrix plug interface for connecting and communicating with secondary devices, such as the secondary circuit interface module and Figure 1B The secondary devices in the secondary display cabinet 21 shown transmit signals through wires or connect with other devices to achieve unified, convenient and reliable connection of secondary circuits inside and outside the cabinet.

[0066] It should be noted that the incoming and outgoing wiring methods of the modular fully enclosed insulated switchgear provided in the embodiment of the present application can be determined according to the specific application environment of the modular fully enclosed insulated switchgear. For example, the modular fully enclosed insulated switchgear can adopt a bottom incoming and outgoing wiring method, and the solid insulated inner cone type plug interface is arranged at the bottom of the metal box; or, the modular fully enclosed insulated switchgear adopts an upper incoming and outgoing wiring method, and the solid insulated inner cone type plug interface is arranged at the top of the metal box; or, the modular fully enclosed insulated switchgear adopts a side incoming and outgoing wiring method, and the solid insulated inner cone type plug interface is arranged on the side of the metal box.

[0067] Preferably, the embodiment of the present application adopts the upper incoming and outgoing line method, which reduces the construction difficulty and facilitates the installation and maintenance of the modular fully enclosed insulating switchgear.

[0068] Optionally, the modular fully enclosed insulated switchgear is a single-pole switchgear, refer to Figure 3A As shown, Figure 3A The figure shows a rear view of a modular fully enclosed insulated switchgear (single-pole switchgear) with a single-pole structure. The single-pole switchgear is connected to adjacent single-pole switchgears in a staggered and step-by-step manner via the plug-in solid insulated busbar modules.

[0069] Reference Figure 3B As shown, Figure 3B Based on any of the above illustrated embodiments, a top view of a single-pole modular fully enclosed insulating switchgear is provided, in which the secondary circuit interface module is arranged in a matrix plug-in interface manner, so that the appearance of the modular fully enclosed insulating switchgear is neat and beautiful.

[0070] The plug-in solid insulated busbar module 13 includes a plurality of fully solid insulated U-shaped conductors 131. Figure 4 As shown, both ends of the U-shaped conductor are provided with solid insulated outer cone plug connectors. The solid insulated outer cone plug connector at one end of the U-shaped conductor is used to connect to the solid insulated inner cone plug connector, and the solid insulated outer cone plug connector at the other end is used to connect to the solid insulated inner cone plug connector of the adjacent modular fully enclosed insulated switchgear.

[0071] The U-shaped conductors, cables or other conductive bodies have equal lengths, uniform spatial shapes, and consistent module sizes to ensure their interchangeability. The specific sizes should be calculated and determined based on the cabinet width, the position of the solid-insulated inner-cone plug-in interface on the cabinet, the distance between the solid-insulated inner-cone plug-in interfaces, the design and installation method, cabinet manufacturing errors, and construction errors.

[0072] Among them, both ends of the U-shaped conductor are set as solid insulated outer cone plug connectors, and the modular fully enclosed insulated switchgear is provided with a solid insulated inner cone plug interface, so that the modular fully enclosed insulated switchgear can be connected to the adjacent modular fully enclosed insulated switchgear through the U-shaped conductor, thereby realizing the parallel connection of two modular fully enclosed insulated switchgear, simplifying the parallel connection operation, and facilitating installation and maintenance.

[0073] The modular fully enclosed insulated switchgear provided in the present application includes a main gas chamber module, an operating mechanism module, a plug-in solid insulated busbar module, a three-position disconnector, a metal box, a transmission device and a solid insulated inner cone plug interface; wherein, the circuit breaker, current transformer and connecting copper bus in the main gas chamber module are arranged in the metal box through the solid insulated inner cone plug interface; the operating mechanism module is connected to the circuit breaker through the transmission device, and the operating mechanism module is used to control the circuit breaker; the plug-in solid insulated busbar module includes a plurality of fully solid-insulated U-shaped conductors, and the two ends of the U-shaped conductor are set as solid-insulated outer cone plug connectors, and the solid insulated outer cone plug connector at one end of the U-shaped conductor is used to connect to the solid insulated inner cone plug connector. The first static contact of the three-position disconnector is connected to the solid-insulated inner-cone plug-in interface, the second static contact is connected to the connector of the circuit breaker, and the third static contact is connected to the grounding terminal. When the movable contact of the three-position disconnector is connected to the first static contact and the second static contact, the main electrical circuit of the modular fully enclosed insulated switchgear is in a conducting state. When the movable contact is connected to the second static contact and the third static contact, the modular fully enclosed insulated switchgear is in a grounding state. When the movable contact is connected to the second static contact and the third static contact, the modular fully enclosed insulated switchgear is in a disconnected state. In an embodiment of the present application, the equipment and conductors constituting the modular fully enclosed insulated switchgear are optimized into multiple modules according to their functions. The modules can be easily assembled and disassembled. The modules and switchgear are connected by using solid-insulated outer-cone plug-in interfaces and solid-insulated inner-cone plug-in interfaces, thereby achieving the effect of easy and quick replacement and maintenance. And because the two ends of the U-shaped conductor provided in the embodiment of the present application are set as solid-insulated outer cone plug connectors, and the modular fully enclosed insulated switch cabinet is provided with a solid-insulated inner cone plug interface, the modular fully enclosed insulated switch cabinet can be connected to the solid-insulated inner cone plug interface of the adjacent modular fully enclosed insulated switch cabinet through the U-shaped conductor, thereby realizing the merging of two modular fully enclosed insulated switch cabinets, simplifying the merging operation. In addition, on the one hand, the U-shaped conductor and the modular fully enclosed insulated switch cabinet are connected through the solid-insulated outer cone plug connector and the solid-insulated inner cone plug interface, which is easy to disassemble, reducing the difficulty of repairing and inspecting the modular fully enclosed insulated switch cabinet. On the other hand, the modular fully enclosed insulated switch cabinet provided in the embodiment of the present application realizes modularization, and each module can be disassembled, which also reduces the difficulty of repairing the modular fully enclosed insulated switch cabinet and improves maintenance efficiency.

[0074] When the modular fully enclosed insulated switchgear is a single-pole switchgear, multiple groups of plug-in solid insulated busbar modules such as Figure 4 Set up as shown, Figure 4This is a top view of the use of U-shaped conductors to connect single-pole switchgear. The connection method of the U-shaped conductor is: the plug-in solid insulated busbar modules are numbered at the position of the top panel of the modular fully enclosed insulated switchgear. When connected through the U-shaped conductor, the two solid insulated outer cone plug connectors of the same U-shaped conductor are respectively inserted into the plug-in solid insulated busbar modules with the same number of the two adjacent modular fully enclosed insulated switchgears, forming a U-shaped conductor. Figure 4 The staggered step-by-step installation method shown is parallel to the cabinet surface. The dimensions of each set of U-shaped conductors are consistent, and the dimensions of each set of plug-in solid insulated busbar modules are consistent.

[0075] Alternatively, the modular fully enclosed insulated switchgear is a multi-pole switchgear such as a bipolar switchgear or a tripolar switchgear. For the multi-pole switchgear, the parallel operation is performed by using an oblique step method. For example, referring to Figure 5A As shown, Figure 5A This is the back view of the modular fully enclosed insulated switchgear (double-pole switchgear) with a double-pole structure. Figure 5B The top view of the bipolar switch cabinet. The modular fully enclosed insulated switch cabinet is connected to the adjacent modular fully enclosed insulated switch cabinet in an oblique parallel manner through the plug-in solid insulated busbar module. Figure 6 As shown, multiple groups of plug-in solid insulated bus modules are as follows Figure 6 Set up as shown, Figure 6 This is a top view of the modular fully enclosed insulated switchgear with a bipolar structure using U-shaped conductors for cabinet connection.

[0076] That is, the first-pole plug-in solid insulated busbar module of the modular fully enclosed insulated switchgear is connected to the first-pole plug-in solid insulated busbar module of the adjacent modular fully enclosed insulated switchgear, and the second-pole plug-in solid insulated busbar module of the modular fully enclosed insulated switchgear is connected to the second-pole plug-in solid insulated busbar module of the adjacent modular fully enclosed insulated switchgear.

[0077] Alternatively, the modular fully enclosed insulated switchgear is a three-pole switchgear. For example, when the three-pole switchgear is connected in parallel using a U-shaped conductor, the connection method is as follows: Figure 7 As shown, multiple groups of plug-in solid insulated bus modules are as follows Figure 7 Set up as shown, Figure 7 This is a top view of the modular fully enclosed insulated switchgear with a three-pole structure using U-shaped conductors for cabinet connection.

[0078] That is, when three-pole switchgear is connected in parallel, the third-pole plug-in solid-insulated busbar module of the modular fully enclosed insulated switchgear is connected to the third-pole plug-in solid-insulated busbar module of the adjacent modular fully enclosed insulated switchgear. When viewed from above, the U-shaped conductors are arranged in a staggered, parallel pattern, not parallel to the direction of paralleling of the modular fully enclosed insulated switchgear. The angle is determined by the distance between the solid-insulated inner cone-shaped plug-in interfaces on the top panel.

[0079] Optionally, the connection module includes a first connection unit and a second connection unit, the first connection unit includes a plurality of clips and hinges, and the connection plate is connected to the first connection unit by welding the clips to the first connection unit; the first connection unit and the second connection unit are provided on the front cabinet surface, top cabinet surface and back cabinet surface of the modular fully enclosed insulating switch cabinet, wherein the first connection unit and the second connection unit on the same cabinet surface are arranged in relative positions, and the first connection unit of the modular fully enclosed insulating switch cabinet is used to connect with the second connection unit of an adjacent modular fully enclosed insulating switch cabinet, or the second connection unit of the modular fully enclosed insulating switch cabinet is connected with the first connection unit of an adjacent modular fully enclosed insulating switch cabinet.

[0080] For example, the following situations may be involved when the first connection unit and the second connection unit are provided on the front panel of the modular fully enclosed insulated switchgear:

[0081] 1. A first connecting unit is provided at the upper left and lower left corners of the front counter, and a second connecting unit is provided at the upper right and lower right corners of the front counter. In this case, the first connecting unit provided at the upper left corner of the front counter and the second connecting unit provided at the upper right corner of the front counter are on the same horizontal line; the first connecting unit provided at the lower left corner of the front counter and the second connecting unit provided at the lower right corner of the front counter are on the same horizontal line; and the connecting plate of the front counter is on the left side of the front counter.

[0082] Therefore, the connecting plate on the left side of the main cabinet surface of the modular fully enclosed insulated switchgear can be connected to the second connecting unit on the right side of the main cabinet surface of the adjacent modular fully enclosed insulated switchgear, so that the first modular fully enclosed insulated switchgear and the second modular fully enclosed insulated switchgear after the cabinets are connected are seamless from a frontal perspective.

[0083] Second, second connecting units are provided at the upper left and lower left corners of the front counter, and correspondingly, first connecting units are provided at the upper right and lower right corners of the front counter. In this case, the second connecting unit provided at the upper left corner of the front counter is on the same horizontal line as the first connecting unit provided at the upper right corner of the front counter; the second connecting unit provided at the lower left corner of the front counter is on the same horizontal line as the first connecting unit provided at the lower right corner of the front counter; and the connecting plate of the front counter is on the right side of the front counter.

[0084] Thus, the connection plate on the right side of the front panel of the modular fully enclosed insulated switchgear can be connected to the second connection unit on the left side of the front panel of the adjacent modular fully enclosed insulated switchgear, so that the modular fully enclosed insulated switchgear after the cabinets are connected and the adjacent modular fully enclosed insulated switchgear are seamless from a frontal perspective. Figure 8A As shown, Figure 8A This is a schematic diagram of connecting the connecting plate 81 on the right side of the front panel of a modular fully enclosed insulated switch cabinet with the second connecting unit 82 on the left side of the front panel of an adjacent modular fully enclosed insulated switch cabinet, wherein: Figure 8A The cabinet surface on the left side is the main cabinet surface of the modular fully enclosed insulating switch cabinet, the cabinet surface on the right side is the main cabinet surface of the adjacent modular fully enclosed insulating switch cabinet, and 83 is the first connection unit.

[0085] Referring to the arrangement of the first and second connection units on the front panel, the arrangement of the first and second connection units on the rear panel is similar, with two different arrangement methods, each of which will not be described in detail here. It should be noted that the first and second connection units are both arranged at the corner positions of the rear panel of the modular fully enclosed insulated switchgear.

[0086] The following examples illustrate the connection of the top panel of a modular fully enclosed insulated switchgear using several scenarios:

[0087] 1. Install a first connection unit 83 at the left rear corner and the left front corner of the top cabinet surface, and correspondingly, install a second connection unit 82 at the right rear corner and the right front corner of the top cabinet surface. In this case, the connection plate of the top cabinet surface is on the left side of the top cabinet surface.

[0088] Therefore, the connecting plate on the left side of the top cabinet surface of the modular fully enclosed insulated switchgear can be connected to the second connecting unit on the right side of the top cabinet surface of the adjacent modular fully enclosed insulated switchgear, so that the first modular fully enclosed insulated switchgear and the second modular fully enclosed insulated switchgear after the cabinets are connected are seamless from a top-down perspective.

[0089] Second, a second connection unit 82 is provided at the left rear corner and the left front corner of the top cabinet surface, and correspondingly, a first connection unit 83 is provided at the right rear corner and the right front corner of the top cabinet surface. In this case, the connection plate of the top cabinet surface is on the right side of the top cabinet surface.

[0090] Thus, when the modular fully enclosed insulated switchgear is connected to the top cabinet surface of the adjacent modular fully enclosed insulated switchgear through the first connecting unit and the second connecting unit, the connecting plate on the right side of the top cabinet surface of the modular fully enclosed insulated switchgear can be connected to the second connecting unit on the left side of the top cabinet surface of the adjacent modular fully enclosed insulated switchgear, so that the first modular fully enclosed insulated switchgear and the second modular fully enclosed insulated switchgear after the cabinets are connected are seamless from a top-down perspective. Figure 8B As shown, Figure 8B This is a schematic diagram of connecting the connecting plate on the right side of the top panel of a modular fully enclosed insulated switchgear cabinet with the second connecting unit on the left side of the top panel of an adjacent modular fully enclosed insulated switchgear cabinet, wherein: Figure 8B The cabinet surface on the left side is the top cabinet surface of the modular fully enclosed insulating switchgear, and the cabinet surface on the right side is the top cabinet surface of the adjacent modular fully enclosed insulating switchgear.

[0091] Among them, the first connecting unit and the second connecting unit arranged on the top cabinet surface of the modular fully enclosed insulating switch cabinet can also be used as hanging buckles for hanging the modular insulating switch, which is very practical.

[0092] When combining modular fully enclosed insulated switchgear with adjacent modular fully enclosed insulated switchgear, to improve heat dissipation, a gap of a predetermined distance is reserved between the two adjacent modular fully enclosed insulated switchgear (e.g., the first modular fully enclosed insulated switchgear and the second modular fully enclosed insulated switchgear). For example, the width of the predetermined gap can be 20 mm, 25 mm, or so on, and the specific width can be determined based on the actual application scenario. The width of the connecting plate should be greater than the width of the predetermined gap. For example, when the width of the predetermined gap is 20 mm, the width of the connecting plate can be 40 mm; when the width of the predetermined gap is 25 mm, the width of the connecting plate can be 50 mm. However, the relationship between the width of the connecting plate and the width of the predetermined gap is not limited to a factor of 2. This is merely an example and can be determined based on the actual application scenario. Traditionally combined switchgear forms a single unit. When repairing a single switchgear in the combined switchgear, each switchgear in the combined switchgear must be disassembled, which is difficult and labor-intensive. In the embodiment of the present application, a gap of a predetermined distance is reserved between two adjacent modular fully enclosed insulated switchgear cabinets after merging. When one modular fully enclosed insulated switchgear cabinet needs to be disassembled for maintenance, the other modular fully enclosed insulated switchgear cabinets do not need to be moved or disassembled, thus reducing maintenance difficulty and enabling independent installation and removal of the modular fully enclosed insulated switchgear cabinets. Furthermore, the predetermined gap is shielded by the connecting plate, achieving a seamless connection and providing dustproof and stable operation.

[0093] Because the first and second connecting units are relatively small, they can be embedded within the front, rear, and top panels of the modular fully enclosed insulated switchgear. This allows the combined modular fully enclosed insulated switchgear to have a smooth, integrated, and aesthetically pleasing overall surface. By connecting the front, top, and rear panels of the first and second modular fully enclosed insulated switchgear via the connecting plate, the gaps between adjacent modular fully enclosed insulated switchgear are more tightly sealed, not only preventing dust but also stabilizing the modular fully enclosed insulated switchgear, improving the combined modular fully enclosed insulated switchgear's resistance to natural disasters such as earthquakes.

[0094] It should be noted that, if there is a leaning object (such as a wall) on the back of the modular fully enclosed insulating switchgear during actual installation, the first connecting unit and the second connecting unit may not be provided on the back of the modular fully enclosed insulating switchgear.

[0095] In the modular fully enclosed insulated switchgear provided in the embodiment of the present application, after adjacent modules are connected through the plug interface, the surrounding rubber strips are tightly attached to achieve the purpose of waterproofing and dustproofing.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A modular fully enclosed insulated switchgear, characterized in that: include: Main air chamber module, operating mechanism module, plug-in solid insulated busbar module, three-position disconnector, metal box, transmission device and solid insulated inner cone plug interface; The circuit breaker, current transformer and connecting copper bar in the main gas chamber module are arranged in the metal box through a solid insulated inner cone plug interface; The operating mechanism module is connected to the circuit breaker through the transmission device, and the operating mechanism module is used to control the circuit breaker; The plug-in solid insulated busbar module includes a plurality of fully solid-insulated U-shaped conductors, each of which is provided with a solid-insulated outer-cone plug connector at both ends. The solid-insulated outer-cone plug connector at one end of the U-shaped conductor is used to connect to the solid-insulated inner-cone plug connector, and the solid-insulated outer-cone plug connector at the other end is used to connect to the solid-insulated inner-cone plug connector of an adjacent modular fully enclosed insulated switchgear. The first static contact of the three-position disconnector is used to connect to the solid-insulated inner cone plug interface, the second static contact is used to connect to the connector of the circuit breaker, and the third static contact is used to connect to the grounding terminal; when the moving contact in the three-position disconnector is connected to the first static contact and the second static contact, the main electrical circuit of the modular fully enclosed insulating switch cabinet is in a conducting state, when the moving contact is connected to the second static contact and the third static contact, the modular fully enclosed insulating switch cabinet is in a grounding state, and when the moving contact is only connected to the second static contact, the main electrical circuit is in a disconnected state; the three-position disconnector is a plug-in disconnector, which is externally placed on the top of the metal box, and the plug-in disconnector includes: an outer cone plug interface, two inner cone plug interfaces and a vacuum air chamber; the plug-in disconnector is connected to the main air chamber module through the outer cone plug interface, and the inner cone plug interface is used to connect the knife switch of the three-position disconnector; The modular fully enclosed insulated switchgear further comprises: a connection module; The connection module includes a first connection unit and a second connection unit, the first connection unit includes a plurality of clips and hinges, and the connection plate is connected to the first connection unit by welding the clips to the first connection unit; the first connection unit and the second connection unit are provided on the front cabinet surface, the top cabinet surface and the back cabinet surface of the modular fully enclosed insulating switchgear, wherein the first connection unit and the second connection unit on the same cabinet surface are arranged in relative positions, and the first connection unit of the modular fully enclosed insulating switchgear is used to be connected to the second connection unit of the adjacent modular fully enclosed insulating switchgear, or the second connection unit of the modular fully enclosed insulating switchgear is connected to the first connection unit of the adjacent modular fully enclosed insulating switchgear.

2. The modular fully enclosed insulated switchgear according to claim 1, characterized in that: The modular fully enclosed insulated switchgear is a single-pole switchgear, and the modular fully enclosed insulated switchgear is connected to adjacent modular fully enclosed insulated switchgear in a staggered and stepped manner through the plug-in solid insulated busbar module, wherein a gap of a preset distance is left between adjacent modular fully enclosed insulated switchgear; Alternatively, the modular fully enclosed insulated switchgear is a multi-pole switchgear, and the modular fully enclosed insulated switchgear is connected to adjacent modular fully enclosed insulated switchgear in an oblique parallel manner through the plug-in solid insulated busbar module, wherein a gap of a preset distance is left between adjacent modular fully enclosed insulated switchgear.

3. The modular fully enclosed insulated switchgear according to claim 1, characterized in that: The three-position disconnect switch is integrated with the circuit breaker, the circuit breaker and the current transformer are connected in series via the connecting copper busbar, and the circuit breaker is electrically connected in series with the solid-insulated inner cone plug interface.

4. The modular fully enclosed insulated switchgear according to claim 1, characterized in that: The plug-in disconnector is rotated by using a T-type electrode or an anchor-type electrode.

5. The modular fully enclosed insulated switchgear according to claim 1, characterized in that: The modular fully enclosed insulated switchgear further comprises: a gas pressure stabilization module; The gas pressure stabilization module is externally disposed at the bottom or top of the metal box and is in communication with the metal box for regulating the gas pressure in the metal box.

6. The modular fully enclosed insulated switchgear according to claim 1, characterized in that: The modular fully enclosed insulated switchgear further comprises: a secondary circuit interface module; The secondary circuit interface module is located on the top of the modular fully enclosed insulating switch cabinet and is configured as a matrix plug interface for connecting and communicating with secondary equipment.

7. The modular fully enclosed insulated switchgear according to claim 1, characterized in that: The modular fully enclosed insulated switch cabinet further includes: a plug-in lightning arrester module; The plug-in arrester module includes a plug-in arrester and a plug-in voltage transformer. The plug-in arrester is vertically installed on one side of the plug-in arrester module, or horizontally installed on the top of the plug-in arrester module.

8. The modular fully enclosed insulated switchgear according to any one of claims 1 to 7, characterized in that: The modular fully enclosed insulated switchgear adopts a bottom-input and bottom-out method, and the solid-insulated inner cone plug interface is arranged at the bottom of the metal box; Alternatively, the modular fully enclosed insulated switchgear adopts a top-input and top-output mode, and the solid-insulated inner cone plug interface is arranged on the top of the metal box; Alternatively, the modular fully enclosed insulated switchgear adopts a side-input and side-output method, and the solid-insulated inner cone plug interface is arranged on the side of the metal box.

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