CN112086897B - Switch cabinet and switch equipment - Google Patents

Abstract

The invention provides a switch cabinet and switch equipment, comprising: a front cabinet, a front air box, a rear cabinet and a cable chamber; the front air box is an L-shaped air box, the rear air box is a rectangular air box, and the rear air box is arranged at the corner of the front air box and is fixed into a whole through an upper connecting plate, a lower connecting plate and a connecting assembly; the front gas box comprises a first bus chamber and a breaker chamber, the rear gas box comprises a second bus chamber and a connecting gas chamber, and the first bus chamber and the second bus chamber both comprise bus cones which are arranged in a double-layer mode. The invention can reduce the volume and the occupied area of the switch cabinet and effectively improve the temperature rise problem of the switch cabinet.

Description

Switch cabinet and switch equipment

Technical Field

The invention relates to the technical field of power, in particular to a switch cabinet and switch equipment.

Background

The gas-insulated metal-enclosed switchgear (Cubicle type Gas Insulated Switchgear, C-GIS) belongs to power distribution equipment in the field of medium voltage, is suitable for being used in 7.2-40.5 kV power transmission and distribution systems to receive and distribute electric energy, and achieves functions of real-time control, protection, measurement, monitoring, communication and the like of the power system under normal operation and fault conditions; the method is suitable for controlling and protecting places such as electric power, metallurgy, ports, buildings, chemical industry, electrified railways and the like, and is particularly suitable for being used under severe environmental conditions such as underground, plateau, frozen soil, coastal, moisture and the like.

With the acceptance of more users on series gas-insulated metal-enclosed switchgear, the series products are used in a large number and in various places and single bus systems, and in recent years, the use of the gas-insulated metal-enclosed switchgear in a double bus wiring mode is also increasing, whether single bus sectionalized wiring and double bus wiring are adopted, the establishment of main wiring is related to the selection of equipment, the arrangement of distribution devices, relay protection and the determination of automatic devices, and particularly relates to the structural design of the double bus wiring, but the double bus wiring has the following defects: (1) The product has large volume and large occupied area, so the cost is higher; (2) The gas tank is formed by welding stainless steel plates, heat generated in the gas tank can exchange heat with the outside only through the outer surface of the stainless steel plates, the heat conductivity of the stainless steel plates is low, and heat conducted out through the stainless steel plates is less, so that the problem of temperature rise of gas-insulated switchgear, particularly high-current equipment, is particularly solved.

Disclosure of Invention

Accordingly, the present invention is directed to a switchgear and a switchgear, which can effectively improve the temperature rise of the switchgear while reducing the volume and the occupied area of the switchgear.

In a first aspect, an embodiment of the present invention provides a switchgear, including: a front cabinet, a front air box, a rear cabinet and a cable chamber; the front air box is an L-shaped air box, the rear air box is a rectangular air box, and the rear air box is arranged at the corner of the front air box and is fixed into a whole through an upper connecting plate, a lower connecting plate and a connecting assembly; the front gas box comprises a first bus chamber and a breaker chamber, the rear gas box comprises a second bus chamber and a connecting gas chamber, and the first bus chamber and the second bus chamber both comprise bus cones which are arranged in a double-layer mode.

In one embodiment, a front cabinet includes: a housing, an instrument room, and a low pressure room; the housing includes a front door and a front side panel; the instrument room is arranged at the upper part of the front cabinet and is used for installing a control instrument and a control wire; the low-voltage chamber is arranged at the lower part of the front cabinet, and one or more of a three-station switch operating mechanism, a breaker operating mechanism and secondary components are arranged in the low-voltage chamber.

In one embodiment, the first bus bar compartment is disposed at a rear portion of the meter compartment, and the second bus bar compartment is disposed at a rear portion of the first bus bar compartment; the first bus bar chamber and the second bus bar chamber each include: one or more of a pressure release device, a connecting copper bar, a three-station switch and a conductive connecting flange; the first bus chamber is connected with a breaker in the breaker chamber through a conductive connecting flange; the second bus chamber is connected with the connecting copper bars in the connecting air chamber through the conductive connecting flange.

In one embodiment, a circuit breaker chamber is disposed below a first bus bar chamber, comprising: one or more of a current transformer, a secondary wiring flange, an inner cone socket, a connecting copper bar, a pressure release device and a circuit breaker.

In one embodiment, the connection air chamber is disposed directly below the second bus bar chamber, comprising: one or more of a supporting insulator, a connecting copper bar, a sealing flange, a sealing ring, a connecting plate and a connecting bolt; the connecting air chamber is connected with the breaker chamber through a sealing flange and a sealing ring.

In one embodiment, the rear cabinet includes: the device comprises a top cover, a rear side plate, a rear small door and a rear sealing plate; a three-station switch operating mechanism is arranged in the rear cabinet; the rear side plate, the rear small door and the rear sealing plate form a pressure relief channel for releasing fault electric arcs from the top of the switch cabinet to the outside of the cabinet.

In one embodiment, the cable compartment is disposed in a lower-middle portion of the switchgear cabinet, comprising: the cable, the underframe, the side plate and the front sealing plate of the cable chamber penetrate through the cable chamber; the cable chamber is connected with the breaker chamber through an inner cone socket.

In one embodiment, the first bus bar chamber, the second bus bar chamber, the circuit breaker chamber and the cable chamber each comprise a pressure relief channel, and the pressure relief channels are independent of each other.

In one embodiment, the front cabinet is a low voltage chamber and the first bus bar chamber, the second bus bar chamber, the circuit breaker chamber, the connection plenum, the rear cabinet and the cable chamber are all high voltage chambers.

In a second aspect, an embodiment of the present invention provides a switchgear, including a switchgear cabinet provided in any one of the first aspects, and further including a bus-bar plug-in voltage transformer and/or a bus-bar plug-in lightning arrester disposed above the first bus-bar and the second bus-bar chamber, for protecting and metering the bus-bar.

The embodiment of the invention has the following beneficial effects:

the switch cabinet and the switch equipment provided by the embodiment of the invention comprise: a front cabinet, a front air box, a rear cabinet and a cable chamber; the front air box is an L-shaped air box, the rear air box is a rectangular air box, and the rear air box is arranged at the corner of the front air box and is fixed into a whole through an upper connecting plate, a lower connecting plate and a connecting assembly; the front gas box comprises a first bus chamber and a breaker chamber, the rear gas box comprises a second bus chamber and a connecting gas chamber, and the first bus chamber and the second bus chamber both comprise bus cones which are arranged in a double-layer mode. The sealed switch cabinet adopts the design of a double-air-box structure, the front air box is an L-shaped air box, the rear air box is a rectangular air box, and the rear air box is arranged at the corner of the front air box, so that the space in the switch cabinet can be fully utilized, the volume and the occupied area of the sealed switch cabinet are reduced, and the cost is reduced; simultaneously, first bus-bar room and second bus-bar room all include the bus-bar awl of bilayer arrangement, and the bus-bar awl volume of bilayer arrangement is less, the temperature rise is lower to can further reduce the volume of sealed cubical switchboard, and effectively improve the temperature rise problem of sealed cubical switchboard.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a switch cabinet according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of another switch cabinet according to an embodiment of the present invention;

fig. 3 is a schematic front view of a switchgear provided in an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a circuit breaker contact according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of a sealing flange according to an embodiment of the present invention;

fig. 6 is a schematic diagram of releasing an internal fault arc of a switchgear according to an embodiment of the present invention;

fig. 7 is a schematic diagram of a split structure of a switch cabinet according to an embodiment of the present invention;

FIG. 8 is a schematic structural view of a front air box according to an embodiment of the present invention;

FIG. 9 is a schematic structural view of a rear air box according to an embodiment of the present invention;

fig. 10 is a schematic diagram of a connection structure of an air chamber of an in-out line cabinet according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of a partial connection of an air chamber of an in-out line cabinet according to an embodiment of the present invention;

FIG. 12 is a schematic view of a partial connection of an air chamber of another line inlet and outlet cabinet according to an embodiment of the present invention;

FIG. 13 is a schematic diagram of a connection structure of an air chamber of a bus-tie cabinet according to an embodiment of the present invention;

FIG. 14 is a schematic view of partial connection of an air chamber of a bus-tie cabinet according to an embodiment of the present invention;

FIG. 15 is a schematic view of a partial connection of an air chamber of another bus-tie cabinet according to an embodiment of the present invention;

fig. 16 is a schematic structural diagram of a multi-transformer switch cabinet according to an embodiment of the present invention;

fig. 17 is a schematic structural diagram of a single bus switch cabinet according to an embodiment of the present invention;

fig. 18 is a schematic structural diagram of a switchgear according to an embodiment of the present invention;

fig. 19 is a schematic structural diagram of another switching device according to an embodiment of the present invention.

Icon:

1-a front cabinet; 2-a first busbar chamber; 3-a second bus bar compartment; 4-a breaker chamber; 5-connecting the air chamber; 6-a rear cabinet; 7-a cable chamber; 8-a front air box; 9-a rear gas box; 11-an instrument room; 12-a low pressure chamber; 13-a first three-station switch operating mechanism; 14-a breaker operating mechanism; 15-front door; 16-front side plate; 21-a first pressure relief device; 22-a busbar cone of a first double layer arrangement; 23-a first connection copper bar; 24-a first three-station isolating switch; 25-a first conductive connection flange; 26-a first voltage transformer; 31-a second pressure relief device; 32-a bus bar cone of a second double layer arrangement; 33-second connection copper bars; 34-a second three-station disconnecting switch; 35-a second conductive connection flange; 36-a second voltage transformer; 37-bus plug-in type lightning arrester; 41-a current transformer; 42-secondary wiring flange; 43-female taper socket; 44-third connecting copper bars; 45-pressure release means; a 46-circuit breaker; 47-electroscope; 461-upper terminal of the circuit breaker; 462-a breaker lower terminal; 463-duckbill contacts; 51-supporting insulators; 52-fourth connecting copper bars; 53-sealing flange; 54-sealing rings; 55-connecting plates; 56-connecting bolts; 61-top cap; 62-a rear side plate; 63-rear small door; 64-a second three-position switch operating mechanism; 65-rear sealing plates; 71-a cable; 72-underframe; 73-side plates; 74-cable chamber front closure plate; 75-lightning arresters; 91-closing the flange.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The electric main wiring is a circuit which is formed by connecting high-voltage electric appliances through connecting wires and receives and distributes electric energy according to the functional requirements of the high-voltage electric appliances, and becomes a network for transmitting strong current and high voltage, and is also called as a primary wiring or an electric main system. The electrical main wiring is the main body of the electrical part of the power plant, substation. The main wiring is drawn up and closely related to the selection of equipment, the arrangement of a power distribution device, the determination of relay protection and automatic devices, the operation reliability, the economy, the stability and the scheduling flexibility of a power system and the like; the basic wiring form of the electric main wiring is divided into a bus wiring and a bus-free wiring, and the bus wiring comprises: single bus segment wiring, double bus wiring, etc.

The single bus sectionalized wiring is to divide a section of bus into two sections by using the circuit breaker, and has the advantages of simple and clear wiring, less equipment, small investment, convenient operation, easy extension and the like, and has the defects of partial loop power failure, poor reliability and flexibility caused by bus fault or overhaul; when a bus bar or bus bar disconnector fails or overhauls, all power to the bus bar must be disconnected. The disadvantage is even more pronounced when the power supply capacity is large and the number of outgoing lines is large, especially when the number of subscribers for single-loop power supply is large.

The double-bus wiring is to connect the working line, the power line and the outgoing line to the two groups of buses through one breaker and two groups of isolating switches, wherein the two groups of buses are working lines, and each loop can be operated in parallel through the bus connecting breakers. Compared with a single bus, the double buses have the advantages that the power supply reliability is high, the buses can be overhauled in turn without interrupting the power supply, when one group of buses fails, the power supply can be quickly recovered by switching a loop on the failed bus to the other group of buses, and in addition, the double buses have the advantages of convenience in scheduling, extension and overhauling; the disadvantage is that each loop is added with a group of isolating switches, so that the framework and the occupied area of the power distribution device and the investment cost are correspondingly increased; meanwhile, due to the complexity of the power distribution device, misoperation is easy to occur when the operation mode is changed for switching operation, and manual operation is time-consuming and labor-consuming. Particularly when the bus fails, more power supplies and circuits must be cut off for a short time, which is not allowed for large power plants and substations of particular importance. The double bus connection is proposed according to the defect of single bus connection, one group of the double bus connection is a working bus, and the other group is a standby bus, and the double bus connection runs in parallel through a bus-bar circuit breaker.

The existing gas-insulated metal-enclosed switchgear belongs to power distribution equipment in the field of medium voltage, the voltage level is generally 7.2-40.5 kV, the current level is generally 630A, 1250A, 2000A and 2500A, a gas tank is formed by welding stainless steel plates, a primary ventilation part is encapsulated in a closed gas chamber, the gas chamber is filled with relative air pressure of 0.02-0.05 megapascal, the gas is generally pure SF6 gas, compressed air, compressed N2, compressed CO2, CF4, C-C4F8, C3F8, C2F6 and CF3I, and the mixed gas of SF6 and the gas, and the series of gas-insulated metal-enclosed switchgear is suitable for being used in 7.2-40.5 kV power transmission and distribution systems to receive and distribute electric energy, so that functions of real-time control, protection, measurement, monitoring, communication and the like of a power system under normal operation and fault conditions are realized; the method is suitable for controlling and protecting places such as electric power, metallurgy, ports, buildings, chemical industry, electrified railways and the like, and is particularly suitable for being used under severe environmental conditions such as underground, plateau, frozen soil, coastal, moisture and the like. With the acceptance of more users on the miniaturization and maintenance-free requirements of a series of gas-insulated metal-enclosed switchgear, the series of products are widely used in various places and single bus systems, and more projects of using the gas-insulated metal-enclosed switchgear in a double bus wiring mode in recent years are also provided, whether single bus sectionalized wiring and double bus wiring are adopted, the main wiring is formulated in relation to the selection of equipment, the arrangement of distribution devices, relay protection and the determination of automatic devices, and particularly in relation to the double bus wiring structure design of the distribution devices, but the double bus wiring has the following defects:

(1) The product is bulky, and current double bus switch cabinet, overall dimension is: 2855 The length is multiplied by 600/800 width is multiplied by 2870 height, the occupied area is large, the investment cost is high, the gas tank is welded into a whole, the gas tank is large in size and difficult to carry, the side surface of the breaker chamber is provided with an opening for facilitating the installation of components, and the maintenance is inconvenient after the product is combined with a cabinet to run.

(2) Electric operation is not realized, and the operation is unsafe; the isolation/grounding switch of the existing switch cabinet does not realize electric operation; the pressure release channels of the circuit breaker and the cable chamber do not meet relevant standards and user requirements, and high-temperature and high-pressure gas cannot be released from the cabinet top, so that the safe operation between adjacent switch cabinets is particularly affected.

(3) The operation is time-consuming and labor-consuming; taking the double-bus power supply system comprising 8 outgoing line cabinets, 2 incoming line cabinets and 1 bus connecting cabinet as an example, when any section of bus breaks down, the power supply and the circuit involved must be cut off in a short time, if manual operation is used, the time and the labor are wasted, the efficiency is low, misoperation is easy to occur, and the rapid fault removal and timely power transmission cannot be realized in a short time.

(4) Temperature rise problems; the switch cabinet seals components such as a bus, a three-station switch, a circuit breaker, a current transformer and the like in an air chamber, and in order to prevent gas leakage, a primary conductive part and insulating gas are completely sealed in the sealed air chamber, the protection level of the air chamber is generally IP 65-IP 67, and heat of heating components is hardly taken away by means of gas convection between the air chambers and to the outside of the air chamber; in order to meet the requirements of corrosion resistance and high strength, the gas tank is formed by welding stainless steel plates, heat generated in the gas tank can exchange heat with the outside only through the stainless steel plates, the heat conductivity of the stainless steel plates is low, and heat conducted out through the stainless steel plates is less, so that the problem of temperature rise of gas-insulated switchgear, particularly high-current equipment, is particularly solved.

(5) The pressure release channels of the circuit breaker and the cable chamber do not meet relevant standards and user requirements, and high-temperature and high-pressure gas cannot be released from the top of the switch cabinet, so that the operation safety of the switch cabinet and the personal safety of operation maintainers are affected.

Based on the above, the switch cabinet and the switch equipment provided by the embodiment of the invention can effectively improve the temperature rise problem of the switch cabinet while reducing the volume and the occupied area of the switch cabinet, and simultaneously ensure that the pressure release channel meets the relevant standard and the user requirement, and ensure the safe operation of the switch equipment and the personal safety of an operation maintainer.

For the sake of understanding the present embodiment, first, a detailed description will be given of a switch cabinet disclosed in the present embodiment, referring to a schematic structural diagram of a switch cabinet shown in fig. 1, the switch cabinet is shown to include: a front cabinet 1, a front air box 8, a rear air box 9, a rear cabinet 6 and a cable chamber 7; the front air box 8 is an L-shaped air box, the rear air box 9 is a rectangular air box, and the rear air box 9 is arranged at the corner of the front air box 8 and is fixed into a whole through an upper connecting plate, a lower connecting plate and a connecting assembly; the front air box 8 comprises a first bus bar chamber 2 and a breaker chamber 4, the rear air box 9 comprises a second bus bar chamber 3 and a connecting air chamber 5, and the first bus bar chamber 2 and the second bus bar chamber 3 both comprise bus bar cones which are arranged in a double layer.

In one embodiment, the front cabinet 1, the first bus bar chamber 2, the second bus bar chamber 3, the circuit breaker chamber 4, the connection air chamber 5, the rear cabinet 6 and the cable chamber 7 may be connected as one body by bolts; the front air box 8 and the rear air box 9 are all formed by welding stainless steel plates; the front air box 8 is welded into an L-shaped air box and comprises a first bus chamber 2 and a breaker chamber 4, wherein the first bus chamber 2 and the breaker chamber 4 can be separated by a stainless steel plate and a conductive connecting flange arranged on the stainless steel plate to form two independent compartments; the rear air box 9 is welded into a rectangular air box and comprises a second bus chamber 3 and a connecting air chamber 5, wherein the second bus chamber 3 and the connecting air chamber 5 can be separated by a stainless steel plate and a conductive connecting flange arranged on the stainless steel plate to form two independent compartments; the rear air box 9 is placed at the L-shaped corner of the front air box 8 and is fixed into a whole through an upper connecting plate, a lower connecting plate and a connecting component (such as a connecting bolt), and the front air box 8 and the rear air box 9 are combined to form a first bus bar chamber 2, a second bus bar chamber 3, a breaker chamber 4 and a connecting air chamber 5.

The switch cabinet provided by the embodiment of the invention adopts the design of a double-air-box structure, the front air box is an L-shaped air box, the rear air box is a rectangular air box, and the rear air box is arranged at the corner of the front air box, so that the space in the switch cabinet can be fully utilized, the volume and the occupied area of the switch cabinet are reduced, and the cost is reduced; simultaneously, first bus-bar room and second bus-bar room all include the bus-bar awl of bilayer arrangement, and the bus-bar awl volume of bilayer arrangement is less, the temperature rise is lower to can further reduce the volume of cubical switchboard, and effectively improve the temperature rise problem of cubical switchboard.

For ease of understanding, embodiments of the present invention further provide a specific switchgear, referring to a schematic structural diagram of another switchgear shown in fig. 2, the switchgear includes: a front cabinet 1, a first bus bar chamber 2, a second bus bar chamber 3, a breaker chamber 4, a connecting air chamber 5, a rear cabinet 6 and a cable chamber 7. The front cabinet 1 is a low-voltage chamber, and the first bus bar chamber 2, the second bus bar chamber 3, the breaker chamber 4, the connecting air chamber 5, the rear cabinet 6 and the cable chamber 7 are all high-voltage chambers.

Referring to fig. 2, the front cabinet 1 includes: a housing, an instrument room 11, and a low pressure room 12; the housing comprises a front door 15 and a front side panel 16; the instrument room 11 is arranged at the upper part of the front cabinet 1 and is used for installing control instruments and control wires; the low-voltage chamber 12 is arranged at the lower part of the front cabinet 1, and one or more of a first three-station switch operating mechanism 13, a breaker operating mechanism 14 and secondary components are arranged inside the low-voltage chamber.

The front cabinet 1 belongs to a low-pressure secondary chamber and is an independent compartment. Further, the embodiment of the invention also provides a schematic front view of the switch cabinet, and referring to fig. 3, a front door 15 is schematically shown.

The first bus bar chamber 2 is arranged at the rear part of the instrument chamber 11, and the second bus bar chamber 3 is arranged at the rear part of the first bus bar chamber 2; the first busbar chamber 2 includes: one or more of a first pressure release device 21, a first bilayer arranged busbar cone 22, a first connection copper bar 23, a first three-position disconnecting switch 24 and a first conductive connection flange 25; the second busbar chamber 3 includes: one or more of a second pressure relief device 31, a second double layer arranged bus cone 32, a second connection copper bar 33, a second three-position disconnector 34 and a second conductive connection flange 35; wherein the first busbar compartment 2 is connected to a circuit breaker 46 in the circuit breaker compartment 4 by means of a first electrically conductive connection flange 25; the second busbar chamber 3 is connected to a fourth connection copper bar 52 (i.e. a conductive copper bar) in the connection air chamber 5 by means of a second conductive connection flange 35. The first bus bar chamber 2 forms a single bus bar of the switch cabinet, and the first bus bar chamber 2 and the second bus bar chamber 3 are arranged in parallel to form a double bus bar of the switch cabinet.

The breaker chamber 4 is provided below the first busbar chamber 2, and includes: one or more of a current transformer 41, a secondary connection flange 42, an inner cone socket 43, a third connection copper bar 44, a pressure relief device 45, and a circuit breaker 46. For ease of understanding, embodiments of the present invention also provide a schematic structural view of a circuit breaker contact, as shown in fig. 4, illustrating a circuit breaker 46 including a circuit breaker upper terminal 461, a circuit breaker lower terminal 462, and a duckbill contact 463.

The connection air chamber 5 is provided directly below the second bus bar chamber 3, and includes: one or more of a supporting insulator 51, a fourth connecting copper bar 52, a sealing flange 53, a sealing ring 54, a connecting plate 55 and a connecting bolt 56; depending on the design, the breaker chamber 4, the connecting air chamber 5 can be connected to a separate compartment by means of a sealing flange 53 and a sealing ring 54. Specifically, the embodiment of the invention also provides a structural schematic diagram of the sealing flange, and the structural schematic diagram is shown in fig. 5.

The rear cabinet 6 includes: a top cover 61, a rear side plate 62, a rear small door 63, and a rear seal plate 65; a second three-station switch operating mechanism 64 is arranged in the rear cabinet 6; in order to facilitate the operation of the second three-position switch operating mechanism 64, a rear small door 63 is provided on the rear seal plate 65; the rear side plate 62, rear small door 63 and rear closure plate 65 form a pressure relief channel for releasing the fault arc from the top of the switchgear to the outside of the cabinet.

The cable chamber 7 is provided in the middle lower part of the switch cabinet, and includes: a cable 71 passing through the cable compartment, a chassis 72, a side plate 73 and a cable compartment front closure plate 74; the cable chamber 7 is connected to the breaker chamber 4 by means of an inner cone socket 43.

Referring to a schematic diagram of releasing an internal fault arc of a switchgear shown in fig. 6, the front cabinet 1 is an independent compartment under the protection of the first bus chamber 2, the breaker chamber 4 and the cable chamber sealing plate, the internal fault arc generated by each high-voltage chamber cannot reach the front cabinet 1, and the front cabinet 1 and the front door 15 cannot be impacted by the internal fault arc, so that the requirements of preventing the internal fault arc can be met, and the operation safety and personal safety of equipment are ensured.

The rear side plate 62, the rear small door 63 and the rear sealing plate 65 of the rear cabinet 6 are components of a pressure release channel, the top cover 61 can be automatically opened under the impact of arc generated by internal faults, the rear sealing plate 65 can increase the capacity of the switch cabinet for resisting the internal fault arc, equipment and personal safety are ensured, the rear small door 63 is arranged on the rear sealing plate 65, the capacity of the switch cabinet for resisting the internal fault arc can be increased, and the personal safety of an operator is ensured.

The electric arc that the inside trouble of cable chamber 7 produced can't reach preceding cabinet 1, and cable chamber 7 is linked together with back cabinet 6, and the electric arc that the inside trouble produced passes through back cabinet 6, and the top cap 61 of back cabinet 6 can be opened automatically under the impact of the electric arc that the inside trouble produced, and consequently the electric arc that the inside trouble produced can be released from the top of back cabinet 6 to guarantee equipment and personal safety.

In addition, each curb plate, shrouding of the cabinet body all can adopt the aluminium zinc coated steel sheet to bend the back and use the bolt to tie the grafting to form, and the front and back door of cubical switchboard, back shrouding can adopt ordinary steel sheet to bend the welding spraying to form, and each curb plate, shrouding constitute the shell of cubical switchboard, have extremely strong anti internal failure electric arc's ability, can guarantee equipment and personal safety.

The pressure release devices of the first bus bar chamber 2, the second bus bar chamber 3 and the breaker chamber 4 are safety guarantees of the pressure of each air chamber, and the functions of the pressure release devices are similar to those of safety valves. The explosion-proof membrane of the pressure release device can be exploded under the actual pressure lower than a certain value of the air chamber, so that each air chamber is protected from being damaged by the pressure; when the first bus bar chamber 2 and the second bus bar chamber 3 generate internal electric arcs, high-temperature and high-pressure gas can be safely released at the top of each of the first pressure release device 21 and the second pressure release device 31 directly; when the breaker chamber 4 generates internal electric arcs, high-temperature and high-pressure gas can be safely released through the pressure release device 45, and the high-temperature and high-pressure gas can be safely released from the top of the switch cabinet under the flow guidance of the pressure release channel of the rear cabinet 6, so that the pressure release channels of the first bus chamber 2, the second bus chamber 3, the breaker chamber 4 and the cable chamber 7 are mutually independent, the operation among mutually independent compartments of the switch cabinet is not influenced, and the safety and the reliability are improved.

The switch cabinet provided by the embodiment of the invention adopts the design of a double-air-box structure, the front air box is an L-shaped air box, the rear air box is a rectangular air box, and the rear air box is arranged at the corner of the front air box, so that the space in the switch cabinet can be fully utilized, the volume and the occupied area of the switch cabinet are reduced, and the cost is reduced; meanwhile, the first bus room and the second bus room both comprise bus cones which are arranged in a double-layer mode, the size of the bus cones which are arranged in the double-layer mode is small, and temperature rise is low, so that the size of the switch cabinet can be further reduced, and the temperature rise problem of the switch cabinet is effectively improved; in addition, each compartment is reasonably designed and communicated, so that when the switch equipment generates an internal electric arc, high-temperature and high-pressure gas is completely released from the top of the cabinet under the flow guide of the pressure release channel, and the life safety can be ensured; meanwhile, the first bus bar chamber 2, the second bus bar chamber 3, the breaker chamber 4, the rear cabinet 6 and the cable chamber 7 are provided with mutually independent pressure release channels, and safe operation between mutually independent compartments of the switch cabinets and between adjacent switch cabinets is not affected.

Further, an embodiment of the present invention further provides a disassembly structure of a switch cabinet, referring to a schematic diagram of a disassembly structure of a switch cabinet shown in fig. 7, which illustrates that the switch cabinet includes: a front cabinet 1, a first bus bar chamber 2, a second bus bar chamber 3, a breaker chamber 4, a connecting air chamber 5, a rear cabinet 6, a cable chamber 7, a front air box 8 and a rear air box 9.

The front air box 8 is welded into an L-shaped air box and comprises a first bus chamber 2 and a breaker chamber 4, wherein the first bus chamber 2 and the breaker chamber 4 can be separated by a stainless steel plate and a conductive connecting flange arranged on the stainless steel plate to form two independent compartments; the rear air box 9 is welded into a rectangular air box and comprises a second bus chamber 3 and a connecting air chamber 5, wherein the second bus chamber 3 and the connecting air chamber 5 can be separated by a stainless steel plate and a conductive connecting flange arranged on the stainless steel plate to form two independent compartments; the rear air box 9 is placed at the L-shaped corner of the front air box 8 and is fixed as a whole by an upper and lower connecting plate 55 and a connecting bolt 56.

For ease of understanding, the embodiment of the present invention further provides a schematic structure diagram of a front air box and a schematic structure diagram of a rear air box, referring to the schematic structure diagram of a front air box shown in fig. 8, the left side of fig. 8 is a side view of the front air box 8, and the right side of fig. 8 is a front view of the front air box 8, which illustrates that the front air box 8 is welded to an L-shaped air box, and is connected to the rear cabinet 6 through the sealing flange 53.

Referring to the schematic structure of a rear air box shown in fig. 9, the left side of fig. 9 is a side view of the rear air box 9, and the right side of fig. 9 is a front view of the rear air box 9, which illustrates that the rear air box 9 is welded into a rectangular air box, and is connected with the front air box through a sealing flange 91.

The switch cabinet provided by the embodiment of the invention has the same structure and connection manner of all parts as the previous embodiment, and for the sake of brevity, reference is made to the corresponding content in the previous embodiment where the part of this embodiment is not mentioned.

Considering that different design requirements need to be met in practical application, based on this, the switch cabinet provided by the embodiment of the invention can meet different performance requirements through flexible combination and installation of different devices, referring to a schematic connection structure of an in-out line cabinet air chamber shown in fig. 10, it is shown that the upper wiring terminal 461 of the circuit breaker 46 is connected with the lower ends of the first third-station disconnecting switch 24 of the first bus bar chamber 2 and the second third-station disconnecting switch 34 of the second bus bar chamber 3 through the first conductive connecting flange 25 and the second conductive connecting flange 35 respectively, and the fourth connecting copper bar 52 (i.e. conductive copper bar) passes through the vertically arranged sealing flange 53; the lower breaker terminal 462 of the breaker 46 is connected to the current transformer 41 and extends to the inner cone socket 43, and the cable 71 receives current through the inner cone socket 43 to the double bus bar or transmits current to other devices, thereby constituting a design of the in/out line cabinet.

Specifically, the embodiment of the invention further provides a schematic partial connection diagram of the air chamber of the line inlet and outlet cabinet, referring to the schematic partial connection diagram of the air chamber of the line inlet and outlet cabinet shown in fig. 11, the schematic partial connection diagram of the air chamber of the line inlet and outlet cabinet shows that the fourth connection copper bar 52 is connected with the connection air chamber 5 through the sealing ring 54 and the second conductive connection flange 35 by the vertically arranged sealing flange 53.

Further, the embodiment of the invention also provides another schematic partial connection diagram of the air chamber of the line-in and line-out cabinet, referring to fig. 12, which further illustrates that the fourth connection copper bar 52 passes through the vertically arranged sealing flange 53.

In addition, the embodiment of the invention also provides a connection structure of the air chamber of the bus-tie cabinet, referring to a schematic diagram of the connection structure of the air chamber of the bus-tie cabinet shown in fig. 13, which is shown in the schematic diagram: the upper circuit breaker terminal 461 of the circuit breaker 46 is connected to the first three-position disconnector 24 of the first busbar compartment 2 via a first electrically conductive connecting flange 25, the lower circuit breaker terminal 462 of the circuit breaker 46 is connected to the current transformer 41 and extends to the fourth connecting copper bar 52, and the fourth connecting copper bar 52 is connected to the second electrically conductive connecting flange 35 of the second busbar compartment 3 via a transverse sealing flange 53 and extends to the second three-position disconnector 34, so that a design of the busbar cabinet is formed.

Specifically, the embodiment of the invention further provides a schematic partial connection diagram of the air chamber of the bus-bar, referring to the schematic partial connection diagram of the air chamber of the bus-bar shown in fig. 14, which shows that the fourth connection copper bar 52 is connected with the second conductive connection flange 35 of the second bus-bar chamber 3 through the transverse sealing flange 53 and extends to the second three-station isolating switch 34.

Further, the embodiment of the invention also provides a schematic diagram of partial connection of another air chamber of the bus-tie cabinet, referring to the schematic diagram of partial connection of another air chamber of the bus-tie cabinet shown in fig. 15, further illustrating that the fourth connection copper bar 52 passes through the vertically arranged sealing flange 53.

In order to meet the requirements of various design schemes of the electric main system and meet the requirements of related standards and user requirements, a plurality of current transformers 41 can be installed according to the current size and the function requirements of the switch cabinet to form a multi-transformer structure, and the structural schematic diagram of the multi-transformer switch cabinet shown in fig. 16 can be specifically referred to, so that the switch cabinet comprises: a front cabinet 1, a first bus bar room 2, a second bus bar room 3, a breaker room 4, a connection air chamber 5, a rear cabinet 6 and a cable room 7, wherein the breaker room 4 comprises a plurality of current transformers 41.

In addition, for the switch cabinet, the rear air box 9 can be removed according to the design scheme of the electric main system, and the requirement of a single bus system is met under the condition that a plurality of components are unchanged, so that the single bus series switch cabinet is formed. Referring specifically to a schematic structural diagram of a single busbar switchgear shown in fig. 17, the switchgear is shown to include a front cabinet 1, a first busbar compartment 2, a breaker compartment 4, a rear cabinet 6, and a cable compartment 7.

It will be appreciated that the structure of the switch cabinet in the above embodiments is merely exemplary and is not limited thereto.

The switch cabinet provided by the embodiment of the invention can reduce the occupied area of the gas-insulated metal switch cabinet and the investment cost, and the isolation/grounding switch realizes electric operation and automatic control, so that the rapid fault removal and timely power transmission can be realized in a short time. Specifically, the switch cabinet provided by the embodiment solves the problem of temperature rise of the gas-insulated metal-enclosed switch cabinet by using the bus cones arranged in double layers, so that any bus of the double buses has low temperature rise and small volume, the bus cones arranged in double layers can be designed into single-layer bus cones according to the current, and the bus cones adopt standardized parts (2 # cones), so that the switch cabinet has stronger universality and more convenient expansion; secondly, two air chambers are arranged in each air chamber, so that the processing of parts of each air chamber and the integral welding of the air chambers are easy, and the four air chambers of the combined double air chambers are combined and connected, so that the structural design scheme is flexible and changeable, the requirements of various design schemes of double-bus gas-insulated metal-enclosed switchgear are met, the requirements of various design schemes of single-bus gas-insulated metal-enclosed switchgear are also met, and the air chambers are universal and have high standardization degree; meanwhile, the problem of connection of air chambers among the air chambers of the gas-insulated metal-enclosed switchgear is solved by utilizing the sealing flange, so that the connection among the air chambers of the switchgear is safe and reliable, the reliable connection of copper bars of each phase is ensured, the electric gap of the three-phase copper bars is ensured, the structure is simple, the cost is low, the switchgear is easy to assemble and transport for a long distance, and the sealing flange is not only suitable for connection of the air chambers of double buses, but also suitable for connection of buses among cabinets of the switchgear in a special scheme; in addition, the double-bus breaker adopts a modularized structure and duckbill contact plug-in flexible connection, so that the assembly and replacement of the breaker are simpler, the assembly cost is effectively reduced, and the external dimension of the switch cabinet is reduced; finally, through effective combination and installation of components, the components of each compartment are ensured to be convenient to install, the requirements of respective performances are met, meanwhile, the requirements of various design schemes of the switch cabinet are met, and when the switch cabinet generates an internal arc, all high-temperature and high-pressure gas is released from the top of the cabinet under the flow guide of a pressure release channel through reasonable design layout and communication, so that personnel are not injured; meanwhile, the pressure release channels of the breaker chamber, the bus chamber and the cable chamber are mutually independent, and safe operation between mutually independent compartments of the switch cabinets and between adjacent switch cabinets is not affected.

For the switch cabinet, the embodiment of the invention provides switch equipment, which comprises the switch cabinet, and further comprises a bus plug-in type voltage transformer and/or a bus plug-in type lightning arrester which are arranged above the first bus chamber and the second bus chamber and are used for protecting and metering buses.

Referring to a schematic structural diagram of a switching device shown in fig. 18, it is shown that the switching device includes: the front cabinet 1, the first bus bar chamber 2, the first voltage transformer 26, the second bus bar chamber 3, the breaker chamber 4, the electricity testing cone 47, the connecting air chamber 5, the rear cabinet 6, the cable chamber 7 and the lightning arrester 75, wherein the first voltage transformer 26 can be a bus bar plug-in type voltage transformer, is arranged above the first bus bar chamber 2, and the lightning arrester 75 can be arranged in the cable chamber.

Referring to a schematic structural view of another switching device shown in fig. 19, it is shown that the switching device includes: the front cabinet 1, the first bus bar chamber 2, the second bus bar chamber 3, the second voltage transformer 36, the bus bar plug-in type lightning arrester 37, the breaker chamber 4, the electricity testing cone 47, the connecting air chamber 5, the rear cabinet 6, the cable chamber 7 and the lightning arrester 75. Wherein the second voltage transformer 36 and the bus bar plug-in type lightning arrester 37 may be installed above the second bus bar compartment 3, and the lightning arrester 75 may be disposed in the cable compartment.

It will be appreciated that the switchgear in the switchgear shown in fig. 18 and 19 is identical in construction to the previously described switchgear embodiments, to which reference is made for the purposes of this embodiment.

The switch device provided by the embodiment of the invention has the following beneficial effects:

(1) The space of the switch equipment can be effectively utilized, the overall dimension of the switch equipment is reduced on the basis of completing the design function, and the problems of large framework and occupied area of the switch equipment power distribution device and increased investment cost are effectively solved;

(2) The design of the combined double-gas tank structure is flexible and changeable under the condition that the overall dimension of the switch equipment and the size of the gas tank are basically unchanged, and meets the requirements of various design schemes of the single-bus/double-bus gas-insulated metal-enclosed switch equipment;

(3) Through effective combination and installation of components, the components of each compartment are ensured to be convenient to install, the requirements of respective performances are met, meanwhile, the requirements of various design schemes of the switch equipment are met, a series, standardized and modularized product is formed, and the processing, manufacturing and assembling costs are effectively reduced;

(4) The three-station switch and the circuit breaker are electrically operated by adopting an electric operating mechanism, remote control is adopted for electric operation when the operation mode is changed for switching operation, automatic control is realized, and when a bus fails, more power supplies and circuits are cut off in a short time by utilizing an automatic control program; the three-station switch is of a side-mounted rotary structure, is simple to operate, reliable in operation and small in size, and can effectively reduce the width of the switch equipment and serialize the width of the switch equipment (generally 600/800 mm);

(5) The bus cone arranged in the double layers is a universal standardized component (2 # cone), so that the temperature rise of any bus of the double buses is low, the size is small, the bus cone arranged in the double layers can be changed into a single-layer bus cone according to the current, and the bus cone adopts the standardized component (2 # cone), so that the universality of the switch equipment is stronger, and the expansion is more convenient;

(6) The double-bus breaker adopts a modularized structure and flexible connection of contact plug-in type, so that the assembly and replacement of the breaker are simpler, the assembly cost is effectively reduced, and the external dimension of the switch equipment is reduced;

(7) Through reasonable design layout and communication of all the compartments, when the switch equipment generates an internal arc, high-temperature and high-pressure gas is released from the top of the equipment under the flow guide of the pressure release channel, so that people are not injured; meanwhile, the pressure release channels of the breaker chamber, the bus chamber and the cable chamber are mutually independent, and safe operation between mutually independent compartments of the switch equipment and between adjacent switch equipment is not influenced;

(8) The design scheme of the sealing flange and the design scheme of the connecting copper bars ensure reliable connection of the copper bars and ensure electric gaps of the three-phase conductive copper bars, the connection and sealing are reliable, the structure is simple, the cost is low, the switch equipment is easy to assemble and transport for a long distance, and the bus connecting device is not only suitable for connection of each gas tank of double buses, but also suitable for bus connection between cabinets;

(9) In practical engineering application, the scheme is flexible and changeable, easy to select and combine, and the serial scheme has high universality and standardization after combination, and is favorable for tissue engineering design, mass production and assembly.

In addition, in the description of embodiments of the present invention, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (9)

1. A switchgear comprising: a front cabinet, a front air box, a rear cabinet and a cable chamber; the front air box is an L-shaped air box, the rear air box is a rectangular air box, the rear air box is arranged at the corner of the front air box and is fixed into a whole through an upper connecting plate, a lower connecting plate and a connecting assembly, and the front air box is connected with the rear air box through a sealing flange;

the front gas box comprises a first bus chamber and a breaker chamber, the rear gas box comprises a second bus chamber and a connecting gas chamber, the first bus chamber and the second bus chamber both comprise bus cones which are arranged in a double-layer manner, and the first bus chamber and the second bus chamber are arranged in parallel to form double buses of the switch cabinet;

the circuit breaker chamber is arranged below the first bus chamber, and the first bus chamber is connected with a circuit breaker in the circuit breaker chamber through a first conductive connecting flange;

the connecting air chamber is arranged right below the second bus chamber, and the second bus chamber is connected with a fourth connecting copper bar in the connecting air chamber through a second conductive connecting flange; the breaker chamber and the connecting air chamber are communicated into an independent compartment through a sealing flange and a sealing ring;

the first bus chamber, the second bus chamber, the breaker chamber and the cable chamber all comprise pressure release channels, and the pressure release channels are mutually independent; the rear cabinet includes: the device comprises a top cover, a rear side plate, a rear small door and a rear sealing plate; the rear side plate, the rear small door and the rear sealing plate form a pressure relief channel for releasing fault electric arcs from the top of the switch cabinet to the outside of the cabinet.

2. The switchgear cabinet according to claim 1, characterized in that the front cabinet comprises: a housing, an instrument room, and a low pressure room;

the housing includes a front door and a front side panel;

the instrument room is arranged at the upper part of the front cabinet and is used for installing a control instrument and a control wire;

the low-voltage chamber is arranged at the lower part of the front cabinet, and one or more of a three-station switch operating mechanism, a breaker operating mechanism and secondary components are arranged in the low-voltage chamber.

3. The switchgear according to claim 2, characterized in that the first busbar compartment is arranged at the rear of the instrument compartment and the second busbar compartment is arranged at the rear of the first busbar compartment;

the first bus bar compartment and the second bus bar compartment each include: one or more of a pressure release device, a connecting copper bar, a three-station switch and a conductive connecting flange; wherein the first bus-bar chamber is connected with a circuit breaker in the circuit breaker chamber through the conductive connecting flange; the second bus chamber is connected with the connecting copper bars in the connecting air chamber through the conductive connecting flange.

4. The switchgear according to claim 1, characterized in that the circuit breaker chamber comprises: one or more of a current transformer, a secondary wiring flange, an inner cone socket, a connecting copper bar, a pressure release device and a circuit breaker.

5. The switchgear according to claim 1, characterized in that the connection air chamber comprises: one or more of a supporting insulator, a connecting copper bar, a sealing flange, a sealing ring, a connecting plate and a connecting bolt; the connecting air chamber is connected with the breaker chamber through the sealing flange and the sealing ring.

6. The switchgear cabinet according to claim 1, characterized in that the rear cabinet is internally provided with a three-position switch operating mechanism.

7. The switchgear according to claim 4, characterized in that the cable chamber is provided in the middle lower part of the switchgear, comprising: the cable, the underframe, the side plates and the front sealing plate of the cable chamber penetrate through the cable chamber; the cable chamber is connected with the breaker chamber through the inner cone socket.

8. The switchgear cabinet according to claim 1, characterized in that the front cabinet is a low voltage compartment, the first busbar compartment, the second busbar compartment, the circuit breaker compartment, the connection air compartment, the rear cabinet and the cable compartment are all high voltage compartments.

9. A switchgear comprising a switchgear cabinet according to any of claims 1 to 8, further comprising a busbar plug-in voltage transformer and/or a busbar plug-in lightning arrester arranged above the first busbar and the second busbar chamber for protection and metering of the busbars.