A gas insulated metal enclosed switchgear bus coupler

Abstract

This invention discloses a gas-insulated metal-enclosed switchgear bus tie cabinet. The cabinet consists of circuit breaker cabinets and instrument transformer cabinets arranged side by side. Each cabinet comprises a front cabinet, a gas chamber, and a rear cabinet arranged sequentially from front to back, mounted on the switchgear's base frame. The internal space of the gas chambers in both the circuit breaker and instrument transformer cabinets is divided into double chambers by horizontal partitions. The upper chamber of the circuit breaker cabinet's gas chamber is the circuit breaker cabinet busbar chamber, and the lower chamber is the circuit breaker chamber. Similarly, the upper chamber of the instrument transformer cabinet's gas chamber is the instrument transformer cabinet busbar chamber, and the lower chamber is the instrument transformer chamber. The circuit breaker and instrument transformer chambers are interconnected, and the electrical components within are connected via copper busbars, forming the lower chamber of the bus tie cabinet. This invention meets relevant national standards, features a reasonable cabinet structure layout, occupies a small area, is easy to select and combine, and facilitates engineering design and mass production. The two switchgear units can form an organic whole with parallel-operating incoming line cabinets, outgoing line cabinets, and feeder cabinets, resulting in an aesthetically pleasing appearance.

Description

Technical Field

[0001] This invention relates to a gas-insulated, metal-enclosed switchgear bus tie cabinet. Background Technology

[0002] Currently, gas-insulated metal-enclosed switchgear is widely used in urban subways. The power system equipment setup for conventional subway power supply is as follows: a substation is set up every few kilometers in the subway system. The 35kV switchgear is medium-voltage power supply equipment, mainly composed of incoming line cabinets, outgoing line cabinets, feeder cabinets, and bus tie cabinets. When the system has two power supply incoming lines, and the two lines are backups for each other, the main busbars of the two power supplies need to be connected. The switchgear that connects the two busbar sections is called the bus tie cabinet.

[0003] like Figure 1 As shown, the primary scheme of the bus tie cabinet for the 35kV switchgear power supply in the subway consists of two three-position switches (GS1, GS2), one circuit breaker (VCB), and a three-phase current transformer (CT). The installation location of the current transformer is not strictly required according to the primary scheme design; it only needs to meet functional requirements. Specifically, the current transformer can be located below the circuit breaker (VCB) in the same cabinet, or below the three-position switch (GS2) in the same cabinet. Various structural designs are possible for the primary scheme, but regardless of the design, the functional requirements must be met first: connecting the main busbars of the two power supplies. It should be noted that the bus tie cabinet and the two incoming line cabinets are generally prohibited from being closed simultaneously. Secondly, structural requirements must be met: it must comply with the general design requirements for gas-insulated metal-enclosed switchgear, while ensuring its small size, reasonable structural layout, and organic integration with other parallel-operating incoming, outgoing, and feeder cabinets. Summary of the Invention

[0004] The purpose of this invention is to provide a gas-insulated metal-enclosed switchgear bus tie cabinet that is simple in structure, low in cost, has a reasonable structural layout, and occupies a small area.

[0005] The objective of this invention is achieved through the following technical measures: A gas-insulated metal-enclosed switchgear bus tie cabinet, comprising a switchgear with internal electrical components, characterized in that the cabinet body is composed of circuit breaker cabinets and transformer cabinets arranged side by side. The circuit breaker cabinet and transformer cabinet are respectively composed of a front cabinet, a gas box, and a rear cabinet arranged sequentially from front to back, and are mounted on the base frame of the switchgear. The internal space of the gas box of both the circuit breaker cabinet and the transformer cabinet is divided into two gas chambers by a transverse partition. The upper gas chamber of the circuit breaker cabinet gas box is an independent gas chamber, serving as one of the upper gas chambers of the bus tie cabinet, called the circuit breaker cabinet busbar chamber, and the lower gas chamber is the circuit breaker chamber. The upper gas chamber of the transformer cabinet gas box is also an independent gas chamber, serving as the other upper gas chamber of the bus tie cabinet, called the transformer cabinet busbar chamber, and the lower gas chamber is the transformer chamber. The circuit breaker chamber and the transformer chamber are connected, and the electrical components inside are connected by copper busbars, serving as the lower gas chamber of the bus tie cabinet.

[0006] Based on meeting relevant national standards, this invention features a reasonable cabinet structure layout, small footprint, easy selection and combination, and facilitates engineering design and mass production. The bus tie cabinet consists of two switch cabinets and can form an organic whole with the parallel-operating incoming line cabinet, outgoing line cabinet, and feeder cabinet, with an aesthetically pleasing appearance.

[0007] The electrical components within the circuit breaker cabinet gas box of the present invention include a busbar cone installed on the side parallel busbar in the circuit breaker cabinet busbar compartment, a three-position switch, a three-phase conductive flange installed on the bottom plate of the circuit breaker cabinet busbar compartment, a circuit breaker installed in the circuit breaker compartment, upper and lower connecting copper busbars of the circuit breaker, and supporting insulators; the electrical components within the instrument transformer cabinet gas box include a busbar cone installed on the side parallel busbar in the instrument transformer cabinet busbar compartment, a three-position switch, a three-phase conductive flange installed on the bottom plate of the instrument transformer busbar compartment, and supporting insulators. The current flows into the transformer, which is installed in the transformer compartment, along with the upper and lower connecting copper busbars and supporting insulators. The current flows in from the busbar cone in the circuit breaker busbar compartment, and then sequentially through the three-position switch, three-phase conductive flange, upper connecting copper busbar, circuit breaker, and lower connecting copper busbar. The current flows out from the lower connecting copper busbar of the circuit breaker, through the inter-chamber connecting copper busbar, the lower connecting copper busbar of the transformer, and then sequentially through the transformer, upper connecting copper busbar, three-phase conductive flange, three-position switch, and busbar cone. Alternatively, the current can flow in the opposite direction.

[0008] The busbar cone of the circuit breaker cabinet busbar compartment of the present invention is installed on the inner wall outside the circuit breaker busbar compartment, and the busbar cone of the instrument transformer cabinet busbar compartment is installed on the inner wall outside the instrument transformer busbar compartment.

[0009] The circuit breaker cabinet busbar compartment and the instrument transformer cabinet busbar compartment of the present invention each have electrical component mounting holes on their top plates for installing electrical components, and pressure relief device mounting holes sealed with pressure relief devices on their back plates; the circuit breaker compartment has electrical component mounting holes on both its front and back plates for installing electrical components, and pressure relief device mounting holes sealed with pressure relief devices on its bottom plate; the instrument transformer compartment has electrical component mounting holes on its back plate for installing electrical components, and pressure relief device mounting holes sealed with pressure relief devices on its bottom plate; the electrical component mounting holes are sealed with cover plates after the electrical components in each compartment are installed.

[0010] The inner walls of the circuit breaker compartment and the transformer compartment of the present invention are connected by connecting flanges and sealing rings to form a sealed pressure system. This sealed connection structure is safe, reliable, simple, and inexpensive, making the bus coupler cabinet of the present invention easy to assemble and transport over long distances without leakage.

[0011] The present invention provides parallel cabinet connecting blocks on the outer wall of the inner side wall of the circuit breaker cabinet gas box and the transformer cabinet gas box, so that a gap is formed between the two cabinets for installing connecting flanges and for heat dissipation. The part of the parallel cabinet connecting block extending out of the side wall has a connecting hole for inserting a fixing component so as to fix the two cabinets together.

[0012] The parallel connection block of this invention maintains a certain distance between two gas boxes, which is related to the structural design of the connecting flange. This distance is precisely the distance required by the connecting flange structure. The parallel connection block ensures that this distance prevents uneven stress on the sealing ring of the sealing flange due to transportation and vibration. Excessive stress on one side or in a localized area of ​​the sealing ring can reduce or eliminate its elasticity, leading to loss of sealing function and leakage in the gas-filled switchgear under certain pressure. For gas boxes in operating gas-filled switchgear, under the same conditions, the current conductor further away from the outer wall of the gas box has a higher local temperature. This is because the gas sealed inside the gas box is difficult to convect, relying solely on radiation and conduction to carry heat to the gas box surface. Excessive local temperature is the main cause of high gas box temperature. The distance maintained by the parallel connection block of this invention creates a channel connecting the two gas boxes to the outside air. This distance facilitates air circulation and convection between the gas boxes, promoting heat dissipation, and particularly effectively suppressing excessively high local temperatures in the current conductors within the gas boxes.

[0013] The external interfaces of the busbar cones of the circuit breaker cabinet and the instrument transformer cabinet described in this invention are the same size as the external interfaces of the incoming line cabinet, outgoing line cabinet and feeder cabinet, which facilitates cabinet connection and installation.

[0014] The instrument transformer and circuit breaker described in this invention are located on the same side of their respective gas boxes, which can ensure that the path of the primary flow section is the shortest, the gas box openings are the fewest, and the structure is more reasonable.

[0015] The front cabinet, base frame, and rear cabinet of the circuit breaker cabinet and the instrument transformer cabinet of the present invention have the same structure. The gas boxes of the circuit breaker cabinet and the instrument transformer cabinet have the same size, and the busbar cone, three-position switch, cover plate, and pressure relief device in their respective gas boxes have the same structure.

[0016] Compared with the prior art, the present invention has the following significant advantages:

[0017] (1) The circuit breaker cabinet and transformer cabinet of this invention form a bus tie cabinet, which can realize that when there are two power supply incoming lines in the system, the two lines can serve as backups for each other. When needed, the main bus of the two power supply lines can be connected to meet their functional requirements. On this basis, the structure and layout of each cabinet are reasonable, the footprint is small, and it is easy to select and combine, which is conducive to organizing engineering design and mass production. The bus tie cabinet is composed of two switch cabinets and can form an organic whole with the parallel-operating incoming line cabinet, outgoing line cabinet and feeder cabinet, with an aesthetically pleasing appearance.

[0018] (2) The gas box of this invention has a small depth, small volume and small footprint. The external interface of the busbar cone is the same as the external interface of other incoming cabinets, outgoing cabinets and feeder cabinets, which is easy to connect and install. This structural design can meet the needs of most users' solutions. It has a high degree of standardization, is easy to achieve mass production and large-scale production, has low production cost and low overall project cost.

[0019] (3) The circuit breaker compartment of the circuit breaker cabinet and the transformer compartment of the transformer cabinet of the present invention are connected by a connecting flange and a sealing ring to form a sealed pressure system. This seal is safe and reliable, simple in structure, low in cost, and the bus tie cabinet is easy to assemble and transport over long distances without leakage.

[0020] (4) The connecting block on the gas box of the present invention keeps the two gas boxes at a certain distance. It is related to the structural design of the connecting flange. The distance is the distance required by the structure of the connecting flange. The connecting block ensures that the sealing ring of the sealing flange will not be subjected to uneven force due to transportation and vibration. If the sealing ring is subjected to excessive force on one side or in a local area, its elasticity will be reduced or lost, and it will lose its sealing function, resulting in air leakage of the gas-filled switch cabinet under a certain pressure.

[0021] (5) The distance maintained by the connecting blocks on the gas box of the present invention creates a channel between the two gas boxes to connect with the outside air. The existence of this distance is conducive to the air circulation between the gas boxes, forming air convection, which is beneficial to the heat dissipation of the gas boxes, and has a positive effect on suppressing the excessive local temperature of the current conductor inside the gas box. Attached Figure Description

[0022] The present invention will be further described in detail below with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the primary circuit scheme of the bus tie cabinet of the existing 35kV switchgear for subway power supply;

[0024] Figure 2 This is the front view of the present invention;

[0025] Figure 3 This is a side sectional view of the circuit breaker cabinet of the present invention;

[0026] Figure 4 This is a side sectional view of the current transformer cabinet of the present invention;

[0027] Figure 5 This is a front sectional view of the air box of the present invention;

[0028] Figure 6 This is a side sectional view of the gas box of the circuit breaker cabinet of the present invention;

[0029] Figure 7 This is a side sectional view of the air box of the current transformer cabinet of the present invention;

[0030] Figure 8 This is a cross-sectional view of the lower air chamber of the present invention.

[0031] In the diagram: 1-Circuit breaker cabinet; 2-Instrument transformer cabinet; 11-Front cabinet of circuit breaker cabinet; 12-Gas box of circuit breaker cabinet; 13-Rear cabinet of circuit breaker cabinet; 14-Connecting flange; 15-Connecting copper busbar; 16-Parallel connection hole of circuit breaker cabinet; 17-Parallel connection block of circuit breaker cabinet; 18-Base frame of circuit breaker cabinet; 19-Busbar compartment of circuit breaker cabinet; 20-Circuit breaker compartment; 21-Front cabinet of instrument transformer cabinet; 22-Gas box of instrument transformer cabinet; 23-Rear cabinet of instrument transformer cabinet; 24-Connecting hole of instrument transformer cabinet; 26-Parallel connection hole of instrument transformer cabinet; 27-Parallel connection hole of instrument transformer cabinet. 28-Transformer cabinet base frame; 29-Transformer cabinet busbar compartment; 30-Transformer compartment; 31-Sealing ring; 32-Screw; 33-Bolt; 111-Circuit breaker lower connecting copper busbar; 112-Circuit breaker gas box rear cover plate; 113-Vacuum circuit breaker; 114-Circuit breaker upper connecting copper busbar; 115-Circuit breaker cabinet three-position switch lower contact; 116-Circuit breaker cabinet pressure relief device; 117-Circuit breaker gas box top cover plate; 118-Circuit breaker cabinet busbar cone; 119-Circuit breaker cabinet three-position switch; 120-Break 121-Circuit breaker cabinet three-phase conductive flange; 122-Circuit breaker cabinet three-position switch operating mechanism; 123-Vacuum circuit breaker operating mechanism; 124-Circuit breaker cabinet insulator mounting bracket; 125-Circuit breaker cabinet copper busbar bracket; 126-Circuit breaker cabinet three-position switch upper contact; 127-Circuit breaker cabinet connecting copper busbar; 151-A phase connecting copper busbar, 152-B phase connecting copper busbar, 153-C phase connecting copper busbar; 211-Current transformer lower end connecting copper busbar; 212-Current transformer gas box rear cover plate; 213-Electric... 214 Current transformer upper connecting copper busbar; 215 Lower contact of the three-position switch in the transformer cabinet; 216 Pressure relief device of the transformer cabinet; 217 Top cover plate of the current transformer gas box; 218 Busbar cone of the transformer cabinet; 219 Three-position switch of the transformer cabinet; 220 Three-phase conductive flange of the transformer cabinet; 221 Operating mechanism of the three-position switch of the transformer cabinet; 222 Secondary outgoing flange; 223 Insulator mounting bracket of the transformer cabinet; 224 Support insulator; 226 Upper contact of the three-position switch of the transformer cabinet; 227 Connecting copper busbar of the transformer cabinet. Detailed Implementation

[0032] like Figures 2-8 As shown, this invention provides a gas-insulated metal-enclosed switchgear bus tie cabinet, which includes a cabinet with electrical components installed inside. The cabinet consists of a circuit breaker cabinet 1 and a current transformer cabinet 2 arranged in parallel. From the outside, the gas-insulated metal-enclosed switchgear bus tie cabinet consists of two switch cabinets. When combined with other switch cabinets, it is neat, uniform, and aesthetically pleasing.

[0033] like Figures 2-4As shown, circuit breaker cabinet 1 consists of a front cabinet 11, a gas box 12, and a rear cabinet 13 arranged from front to back, and mounted on a base frame 18. Instrument transformer cabinet 2 consists of a front cabinet 21, a gas box 22, and a rear cabinet 23 arranged from front to back, and mounted on a base frame 28. The internal space of the gas boxes in both circuit breaker cabinet 1 and instrument transformer cabinet 2 is divided into two chambers by transverse partitions. The air chamber above the air box of the circuit breaker cabinet 1 is an independent air chamber, which serves as one of the upper air chambers of the bus tie cabinet and is called the circuit breaker cabinet busbar chamber 19. The lower air chamber is the circuit breaker chamber 20. The air chamber above the air box of the instrument transformer cabinet is an independent air chamber, which serves as another upper air chamber of the bus tie cabinet and is called the instrument transformer cabinet busbar chamber 29. The lower air chamber is the instrument transformer chamber 30. The circuit breaker chamber 20 and the instrument transformer chamber 30 are connected and the electrical components inside are connected through copper busbar 15, which serves as the lower air chamber of the bus tie cabinet.

[0034] To ensure the parallel connection of circuit breaker cabinet 1 and transformer cabinet 2 in the bus tie cabinet and its connection with other switch cabinets, circuit breaker cabinet front cabinet 11 and circuit breaker cabinet rear cabinet 13 are both provided with circuit breaker cabinet parallel connection holes 16; transformer cabinet front cabinet 21 and transformer cabinet rear cabinet 23 are both provided with transformer cabinet parallel connection holes 26; circuit breaker cabinet front cabinet 11 and transformer cabinet front cabinet 21, circuit breaker cabinet base frame 18 and transformer cabinet base frame 28, circuit breaker cabinet rear cabinet 13 and transformer cabinet 23 have the same external dimensions and the same design structure, and circuit breaker cabinet air box 12 and transformer cabinet air box 22 have similar design structures and the same external dimensions.

[0035] A connecting flange 14 is welded onto the circuit breaker cabinet gas box 12, and a current transformer cabinet gas box 22 has a current transformer cabinet connection hole 24 for connecting the gas boxes of the bus tie cabinet. That is, a bus tie cabinet has three gas chambers: two independent upper bus chambers and a lower gas chamber that is interconnected with the circuit breaker gas chamber and the current transformer gas chamber.

[0036] Circuit breaker cabinet gas box 12 is welded with circuit breaker cabinet parallel connection block 17, and transformer cabinet gas box 22 is welded with transformer cabinet parallel connection block 27 for fixing the gas box of the bus tie cabinet; the parallel connection block ensures that the distance will not cause uneven force on the sealing ring 31 on the sealing flange 14 due to transportation and vibration. If the sealing ring 31 is subjected to excessive force on one side or in a local area, its elasticity will be reduced or lost, and it will lose its sealing function, resulting in air leakage of the gas-filled switch cabinet under a certain pressure.

[0037] The connecting copper busbar 15 connects the primary current-carrying parts of the circuit breaker cabinet 1 and the current transformer cabinet 2 to form the primary current-carrying part of the bus tie cabinet.

[0038] The gas boxes of circuit breaker cabinet 1 and instrument transformer cabinet 2 are designed as double-chamber gas boxes with partitions. The gas box of circuit breaker cabinet 1 includes circuit breaker cabinet busbar compartment 19 and circuit breaker compartment 20, while the gas box of instrument transformer cabinet 2 includes instrument transformer cabinet busbar compartment 29 and instrument transformer compartment 30. The circuit breaker cabinet busbar compartment 19 and instrument transformer cabinet busbar compartment 29 have the same design scheme, both being independent gas boxes with mounting holes for electrical components on the top and mounting holes for pressure relief devices on the back plate. The circuit breaker compartment 20 has mounting holes for electrical components on both the front and back plates, and mounting holes for pressure relief devices on the bottom plate. The instrument transformer compartment 30 only has mounting holes for electrical components on the back plate, and mounting holes for pressure relief devices on the bottom plate.

[0039] like Figures 5-8 As shown, the electrical components in the circuit breaker cabinet busbar compartment 19 include: circuit breaker cabinet busbar cone 118, circuit breaker cabinet connecting copper busbar 127, supporting insulator 124 (the supporting insulators in each compartment are the same), circuit breaker cabinet three-position switch upper contact 126, circuit breaker cabinet three-position switch 119 (the front cabinet is equipped with a circuit breaker cabinet three-position switch operating mechanism 121), circuit breaker cabinet three-position switch lower contact 115, and circuit breaker cabinet three-phase conductive flange 120, forming the primary current-carrying part of the circuit breaker cabinet busbar compartment 19; the electrical components in the transformer cabinet busbar compartment 29 include: transformer cabinet busbar cone 218, transformer cabinet connecting copper busbar 227, supporting insulator 224 (the supporting insulators in each compartment are the same), upper contact 126 of the circuit breaker cabinet three-position switch, upper contact 126 of the circuit breaker cabinet three-position switch, lower ... The transformer cabinet consists of the following components: upper contact 126 of the three-position switch (with the same insulators), three-position switch 219 of the transformer cabinet (with operating mechanism 221 of the three-position switch 221 in the front cabinet), lower contact 215 of the three-position switch 215 of the transformer cabinet, and three-phase conductive flange 220 of the transformer cabinet. The circuit breaker gas box top cover 117 and the current transformer gas box top cover 217 are used to seal the electrical component mounting holes on the top plate of their respective busbar compartments. The circuit breaker cabinet pressure relief device 116 and the transformer cabinet pressure relief device 216 are used to seal the pressure relief device mounting holes on the back plate of each busbar compartment, thus forming the busbar compartments of circuit breaker cabinet 1 and transformer cabinet 2.

[0040] The circuit breaker cabinet busbar cone 118 and the instrument transformer cabinet busbar cone 218, the circuit breaker cabinet support insulator 124 and the instrument transformer cabinet support insulator 224, the circuit breaker cabinet three-position switch upper contact 126 and the instrument transformer cabinet connecting copper busbar 226, the circuit breaker cabinet three-position switch 119 and the instrument transformer cabinet three-position switch 219, the circuit breaker cabinet three-position switch lower contact 115 and the instrument transformer cabinet three-position switch lower contact 215, the circuit breaker cabinet three-phase conductive flange 120 and the instrument transformer cabinet three-phase conductive flange 220, the circuit breaker gas box top cover 117 and the current transformer gas box top cover 217, the circuit breaker cabinet pressure relief device 116 and the instrument transformer cabinet pressure relief device 216 have the same external dimensions and design structure. This design can meet the needs of most users, has a high degree of standardization, is easy to achieve mass production and large-scale production, has low production costs, and low overall project cost.

[0041] The lower air chamber, formed by the interconnected circuit breaker compartment 20 and current transformer compartment 30, contains electrical components including a circuit breaker upper connecting copper busbar 114, a vacuum circuit breaker 113 (with a vacuum circuit breaker operating mechanism 122 located in the front cabinet), a circuit breaker lower connecting copper busbar 111, a current transformer lower connecting copper busbar 211, a current transformer 213, and a current transformer upper connecting copper busbar 214. A connecting copper busbar 15 connects the circuit breaker lower connecting copper busbar 111 and the current transformer lower connecting copper busbar 211. Vacuum circuit breaker 113 and current transformer 213 are connected together and connected to the three-phase conductive flange to form the primary current-carrying section of the lower air chamber of the bus tie cabinet. After the primary current-carrying section is installed and commissioned, the electrical component mounting holes of the lower air chamber are sealed using the rear cover plate 112 of the circuit breaker air chamber and the rear cover plate 212 of the current transformer air chamber. The pressure relief device mounting holes at the bottom of each air chamber are sealed using the pressure relief device 116 of the circuit breaker cabinet or the pressure relief device 216 of the current transformer cabinet, thus forming the lower air chamber of the bus tie cabinet. A secondary appearance flange 222 is provided at the bottom of the back plate of the current transformer compartment.

[0042] The circuit breaker gas box rear cover plate 112, the current transformer gas box rear cover plate 212, the circuit breaker gas box top cover plate 117, and the current transformer gas box top cover plate 217 have the same external dimensions and the same design structure.

[0043] The circuit breaker cabinet 1 and the current transformer cabinet 2 can be arranged side-by-side, but the busbar cone 118 of the circuit breaker cabinet and the busbar cone 218 of the current transformer cabinet must be on the left and right outer sides of the bus tie cabinet. The connecting flange 14 is fixed and sealed in the middle of the circuit breaker cabinet 1 and the current transformer cabinet 2 using a sealing ring 31 and the connecting hole 24 of the current transformer cabinet with screws 32. The three-phase copper busbars connecting the circuit breaker and the current transformer have different designs, such as copper busbar 151 for phase A, copper busbar 152 for phase B, and copper busbar 153 for phase C. The support designs of the circuit breaker cabinet supporting insulator 124 and the current transformer cabinet 224 are also different. Viewed from the front of the cabinet, the current transformer 213 and the vacuum circuit breaker 113 are on the same side, which can ensure the shortest path for the primary current-carrying part. The gas box has the fewest openings, resulting in a more reasonable structure.

[0044] like Figure 8 As shown, the circuit breaker cabinet parallel connection block 17 and the transformer parallel connection block 27 are connected and fixed to the gas box of the bus tie cabinet by bolts 33. The parallel connection blocks on the gas boxes maintain a certain distance between the two gas boxes, which is related to the structural design of the connecting flange. The distance maintained is the distance required by the structure of the connecting flange. The distance maintained by the connection blocks on the gas boxes forms a channel between the two gas boxes and the outside air. The existence of this distance is conducive to the air circulation between the gas boxes, forming air convection, which is beneficial to the heat dissipation of the gas boxes. In particular, it has a positive effect on suppressing the excessively high local temperature of the current conductors inside the gas box. For the gas boxes of gas-filled switchgear in operation, under the same conditions, the current conductors farther away from the outer wall of the gas box have a higher local temperature. The reason is that the gas sealed inside the gas box is difficult to form convection, and heat is carried to the surface of the gas box only by radiation and conduction. Excessively high local temperature is the main reason for the excessively high temperature of the gas box.

[0045] Based on the above typical structural design, the current flows from the side busbar cone 118 of the circuit breaker cabinet 1 gas box busbar compartment, through the three-position switch 119 of the circuit breaker cabinet, through the three-phase conductive flange 120 of the circuit breaker cabinet and the upper connecting copper busbar 114 of the circuit breaker, into the circuit breaker 113 in the circuit breaker cabinet compartment, through the circuit breaker 113, through the lower connecting copper busbar 111 of the circuit breaker, and into the current transformer cabinet connected to the connecting flange 14. The current flows through the current transformer compartment 2, through the copper busbar 211 at the lower end of the current transformer, through the current transformer 213, and then through the copper busbar 214 at the upper end of the current transformer into the three-phase conductive flange 220 of the current transformer cabinet. After passing through the three-position switch 219 of the current transformer cabinet, it flows out from the busbar cone 218 of the current transformer cabinet busbar in the side parallel busbar compartment of the current transformer cabinet. It runs in parallel with other incoming cabinets, outgoing cabinets, and feeder cabinets, forming an organic whole. The current can also flow in the opposite direction.

Claims

1. A gas-insulated, metal-enclosed switchgear bus coupler cabinet, comprising a cabinet with internally installed electrical components, characterized in that: The cabinet consists of circuit breaker cabinets and instrument transformer cabinets arranged side by side. Each circuit breaker cabinet and instrument transformer cabinet is composed of a front cabinet, an air box, and a rear cabinet arranged sequentially from front to back and mounted on a base frame. The internal space of the air box of both the circuit breaker cabinet and the instrument transformer cabinet is divided into two air chambers by a horizontal partition. The upper air chamber of the circuit breaker cabinet air box is an independent air chamber, which serves as one of the upper air chambers of the bus tie cabinet and is called the circuit breaker cabinet busbar chamber. The lower air chamber is the circuit breaker chamber. The upper air chamber of the instrument transformer cabinet air box is an independent air chamber, which serves as the other upper air chamber of the bus tie cabinet and is called the instrument transformer cabinet busbar chamber. The lower air chamber is the instrument transformer chamber. The circuit breaker chamber and the instrument transformer chamber are connected, and the electrical components inside are connected by copper busbars, forming the lower air chamber of the bus tie cabinet.

2. The gas-insulated metal-enclosed switchgear bus coupler cabinet according to claim 1, characterized in that: The electrical components within the circuit breaker cabinet gas box include a busbar cone installed on the side parallel busbar in the circuit breaker cabinet busbar compartment, a three-position switch, a three-phase conductive flange installed on the bottom plate of the circuit breaker cabinet busbar compartment, a circuit breaker installed in the circuit breaker compartment, upper and lower connecting copper busbars of the circuit breaker, and supporting insulators; the electrical components within the instrument transformer cabinet gas box include a busbar cone installed on the side parallel busbar in the instrument transformer cabinet busbar compartment, a three-position switch, a three-phase conductive flange installed on the bottom plate of the instrument transformer cabinet busbar compartment, and an instrument transformer installed in the instrument transformer compartment. The current flows into the circuit breaker cabinet from the busbar cone in the busbar compartment, and then flows sequentially through the three-position switch, three-phase conductive flange, upper connecting copper busbar, circuit breaker, and lower connecting copper busbar in the gas box of the circuit breaker cabinet. The current flows out from the lower connecting copper busbar of the circuit breaker, through the connecting copper busbar between the gas chambers, the lower connecting copper busbar of the current transformer, and then sequentially through the current transformer in the gas box of the current transformer cabinet, the upper connecting copper busbar, three-phase conductive flange, three-position switch, and busbar cone. Alternatively, the current can flow in the opposite direction.

3. The gas-insulated metal-enclosed switchgear bus tie cabinet according to claim 2, characterized in that: The busbar cone of the circuit breaker cabinet busbar compartment is installed on the inner wall outside the circuit breaker cabinet busbar compartment, and the busbar cone of the instrument transformer cabinet busbar compartment is installed on the inner wall outside the instrument transformer cabinet busbar compartment.

4. The gas-insulated metal-enclosed switchgear bus tie cabinet according to claim 3, characterized in that: The circuit breaker cabinet busbar compartment and the instrument transformer cabinet busbar compartment each have electrical component mounting holes on their top plates for installing electrical components, and pressure relief device mounting holes sealed with pressure relief devices on their back plates; the circuit breaker compartment has electrical component mounting holes on both its front and back plates, and pressure relief device mounting holes sealed with pressure relief devices on its bottom plate; the instrument transformer compartment has electrical component mounting holes on its back plate, and pressure relief device mounting holes sealed with pressure relief devices on its bottom plate; the electrical component mounting holes are sealed with cover plates after the electrical components in each compartment are installed.

5. The gas-insulated metal-enclosed switchgear bus tie cabinet according to claim 4, characterized in that: The side walls of the circuit breaker compartment and the instrument transformer compartment are connected by connecting flanges and sealing rings to form a sealed pressure system.

6. The gas-insulated metal-enclosed switchgear bus tie cabinet according to claim 5, characterized in that: Parallel connection blocks are provided on the outer wall of the inner side wall of the circuit breaker cabinet gas box and the transformer cabinet gas box to form a gap between the two cabinets for installing connection flanges and for heat dissipation. The part of the parallel connection block that extends out of the side wall has a connection hole for inserting a fixing component to fix the two cabinets together.

7. The gas-insulated metal-enclosed switchgear bus coupler cabinet according to claim 6, characterized in that: The external interfaces of the busbar cones of the circuit breaker cabinet and the instrument transformer cabinet are the same as the external interfaces of the incoming line cabinet, outgoing line cabinet and feeder cabinet.

8. The gas-insulated metal-enclosed switchgear bus coupler cabinet according to claim 7, characterized in that: The current transformer and the circuit breaker are located on the same side of their respective gas boxes.

9. The gas-insulated metal-enclosed switchgear bus tie cabinet according to claim 8, characterized in that: The front cabinet, base frame, and rear cabinet of the circuit breaker cabinet and the instrument transformer cabinet have the same structure. The gas boxes of the circuit breaker cabinet and the instrument transformer cabinet have the same size, and the busbar cone, three-position switch, cover plate, and pressure relief device inside their respective gas boxes have the same structure.

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