A compact metal-clad high-voltage switchgear

Abstract

The application relates to the technical field of high-voltage switch cabinets, and discloses a compact metal-clad high-voltage switch cabinet which comprises a cabinet body, a metal partition plate is fixed in the cabinet body, and the metal partition plate encloses an instrument room, a circuit breaker room, a busbar room and a cable room. A handcart guide rail and a circuit breaker handcart mounting position are arranged in the circuit breaker room, and a contact box is arranged on the plug-in side of the circuit breaker handcart mounting position; a main busbar connecting part is arranged in the busbar room, and the main busbar connecting part is electrically connected with the contact box through a branch busbar with an offset section; a current transformer, a grounding switch, a cable terminal and a cable fixing support are arranged in the cable room. A primary main circuit is formed by sequentially connecting the main busbar connecting part, the branch busbar, the contact box, the circuit breaker, the current transformer and the cable terminal. The compact arrangement of the offset section, the metal partition plate compartment structure and the cable room can reduce the width of the cabinet body while maintaining the air insulation gap of the conductive part and the maintenance wiring space.

Description

Technical Field

[0001] This invention relates to the field of high-voltage switchgear technology, and in particular to a compact metal-clad high-voltage switchgear. Background Technology

[0002] Currently, metal-clad high-voltage switchgear is widely used in 12kV power distribution systems, with the KYN28-12 type being a common cabinet model. This type of switchgear typically includes a busbar compartment, circuit breaker compartment, cable compartment, and instrument compartment within the cabinet. Primary conductive components, circuit breaker components, cable outlet components, and secondary control components are separated and arranged using metal partitions to meet operational, maintenance, and isolation requirements. In prefabricated substations, small distribution rooms, and prefabricated modular power distribution systems, where space for switchgear arrangement is limited, the cabinet width directly affects the cabinet row length, aisle layout, and the number of devices installed.

[0003] For the aforementioned power distribution scenarios, existing metal-clad high-voltage switchgear typically installs the main busbar in the busbar compartment and the circuit breaker trolley in the circuit breaker compartment, with the busbar-side conductors and circuit breaker trolley connected via contact boxes. On the outgoing side, current transformers, grounding switches, and cable terminals are generally arranged in the cable compartment, with the cable terminals then connected to external cables. Some compact switchgear designs adjust the arrangement of conductive components within the cabinet or add insulating partitions, insulating sleeves, or other insulating components to allow for installation and connection of conductive components within a smaller cabinet width.

[0004] Existing structures, when compressing the cabinet width, are easily limited by the installation space for busbars, branch busbars, contact boxes, and cable terminals. Directly reducing the distance between the main busbar and branch busbars will decrease the air insulation gap, resulting in insufficient insulation margin between conductive components in humid, condensation-prone, or high-altitude operating environments. If insulation distance is compensated by adding insulating partitions, it will occupy cabinet space and increase the maintenance risks of moisture, dust accumulation, or aging of insulating components. At the same time, if the relative positions of contact boxes, circuit breaker trolleys, and cable compartment components are not arranged accordingly, the circuit breaker insertion path, cable wiring space, and grounding switch installation space can easily encroach on each other, which is not conducive to maintaining a stable primary main circuit connection and maintenance operation space in a narrow cabinet. Summary of the Invention

[0005] The purpose of this invention is to provide a compact metal-armored high-voltage switchgear that solves the problems of crowded internal layout, insufficient air insulation gap of busbars, limited space for circuit breaker insertion, and insufficient space for cable room maintenance and wiring when the width of the existing metal-armored high-voltage switchgear is reduced.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A compact metal-armored high-voltage switchgear includes a cabinet, in which a metal partition is fixed, and the metal partition and the cabinet together form an instrument compartment, a circuit breaker compartment, a busbar compartment and a cable compartment.

[0008] The circuit breaker compartment is fixed with a handcart guide rail, which defines the circuit breaker handcart installation position. A contact box is correspondingly provided on the plug-in side of the circuit breaker handcart installation position.

[0009] The main busbar connection part is fixed in the busbar room, and the main busbar connection part is electrically connected to the contact box through the branch busbar;

[0010] The cable room is equipped with a current transformer, a grounding switch, and a cable terminal.

[0011] Preferably, the front side of the cabinet is provided with an instrument compartment door panel corresponding to the instrument compartment, a circuit breaker compartment door panel corresponding to the circuit breaker compartment, and a cable compartment door panel corresponding to the cable compartment in sequence along the height direction. The bottom wall of the instrument compartment is adjacent to the top wall of the circuit breaker compartment, the bottom wall of the circuit breaker compartment is adjacent to the top wall of the cable compartment, and the busbar compartment is located on the side of the circuit breaker compartment facing away from the front of the cabinet.

[0012] Preferably, the metal partition includes a vertical partition disposed between the busbar compartment and the circuit breaker compartment, the contact box is inserted through or fixed to the vertical partition, one end of the contact box faces the busbar compartment and is connected to the branch busbar, and the other end of the contact box faces the circuit breaker trolley mounting position.

[0013] Preferably, the contact box is provided with a stationary contact, one end of which is electrically connected to the branch busbar, and the other end of which faces the circuit breaker truck mounting position for plugging and mating with the circuit breaker installed in the circuit breaker truck mounting position.

[0014] Preferably, the branch busbar is disposed between the main busbar connection part and the contact box, and the branch busbar has an offset section. The offset section is offset away from the connection center of the main busbar connection part in a direction away from the adjacent phase conductor, so that an enlarged air insulation gap is formed between the branch busbar and the main busbar connection part.

[0015] Preferably, an insulating support is fixed inside the busbar room, the main busbar connection is installed on the insulating support, the branch busbar is led out from the main busbar connection and connected to the contact box via the offset section, and the insulating support is used to limit the relative position between the main busbar connection and the cabinet.

[0016] Preferably, the handcart guide rail is fixed in the circuit breaker compartment, the circuit breaker handcart mounting position forms a push-in path along the handcart guide rail, and the insertion interface of the contact box corresponds to the push-in path, so that the circuit breaker can be inserted into the contact box after being pushed in along the handcart guide rail.

[0017] Preferably, the cable terminal is connected to the cable chamber, the current transformer is sleeved or correspondingly arranged on the cable path of the cable terminal, and the cable fixing bracket is fixed in the cable chamber and supports the cable terminal or the cable connected to the cable terminal.

[0018] Preferably, the grounding switch is installed in the cable room and is connected to the outgoing side of the cable terminal to ground the cable terminal side circuit during maintenance.

[0019] Preferably, the main busbar connection, branch busbar, contact box, circuit breaker installed in the circuit breaker truck mounting position, current transformer and cable terminal sequentially constitute a primary main circuit, and the grounding switch is connected to the outgoing side of the primary main circuit.

[0020] In summary, the present invention has at least one of the following beneficial technical effects:

[0021] 1. This invention utilizes metal partitions within the cabinet to create separate compartments for the instrumentation, circuit breaker, busbar, and cable sections, allowing for the separate arrangement of the secondary control area, circuit breaker installation area, busbar connection area, and cable wiring area. Clear isolation boundaries exist between each functional compartment, maintaining the compartmentalized structure of the metal-clad high-voltage switchgear even with a reduced cabinet width. This facilitates separate maintenance and installation of the circuit breaker trolley, cable terminals, and secondary components.

[0022] 2. This invention includes a main busbar connection section, branch busbars, and insulating supports within the busbar compartment. The branch busbars have offset sections, which are shifted away from the connection center of the main busbar connection section, away from adjacent phase conductors. This structure allows the branch busbars to avoid the concentrated area of ​​adjacent phase conductors near the main busbar connection section when connecting to the contact box. This increases the air insulation gap between conductive components under limited cabinet width, reducing the insulation risk caused by close proximity of conductive components within the busbar compartment.

[0023] 3. This invention places the handcart guide rail in the circuit breaker compartment, aligning the circuit breaker handcart mounting position with the contact box along the guide rail. Simultaneously, a current transformer, grounding switch, cable termination, and cable fixing bracket are installed in the cable compartment. The circuit breaker handcart mounting position, contact box, current transformer, and cable termination sequentially form the primary main circuit. The grounding switch is connected to the outgoing line side, and the cable fixing bracket supports the cable termination or cable, enabling the switchgear to perform circuit breaker insertion, outgoing line current detection, cable wiring, and maintenance grounding functions even under compact layout conditions. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the front structure of the cabinet of the present invention;

[0025] Figure 2 This is a schematic diagram of the internal cross-sectional structure of the cabinet of the present invention;

[0026] Figure 3 This is the electrical schematic diagram of the primary main circuit of the present invention.

[0027] The components include: 1. Cabinet; 2. Circuit breaker trolley mounting position; 3. Contact box; 4. Main busbar connection section; 5. Branch busbar; 6. Insulation support; 7. Current transformer; 8. Grounding switch; 9. Cable terminal; 10. Cable fixing bracket; 11. Instrument room; 12. Circuit breaker room; 13. Busbar room; 14. Cable room; 15. Metal partition; 21. Trolley guide rail; 31. Stationary contact; 51. Offset section. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1 To be continued Figure 3 The present invention will be further described in detail below.

[0029] See attached document Figure 1 To be continued Figure 3 This invention provides a compact metal-armored high-voltage switchgear, comprising a cabinet 1, a circuit breaker trolley mounting position 2, a contact box 3, a main busbar connection part 4, a branch busbar 5, an insulating support 6, a current transformer 7, a grounding switch 8, a cable terminal 9, a cable fixing bracket 10, an instrument compartment 11, a circuit breaker compartment 12, a busbar compartment 13, a cable compartment 14, a metal partition 15, a trolley guide rail 21, a stationary contact 31, and an offset section 51.

[0030] See attached document Figure 1Cabinet 1 is a metal-armored cabinet structure. Cabinet 1 is assembled from metal plates, which are fixed together using fasteners. Cabinet 1 is used to support primary conductive components, secondary control components, insulating support components, and mechanical installation components. The width of Cabinet 1 is 650mm. The width of Cabinet 1 refers to its external dimensions along its left-right front direction. Cabinet 1 is assembled from aluminum-zinc coated steel sheets using bolts. The aluminum-zinc coated steel sheets constitute the frame panels, door panels, and partition panels of Cabinet 1. Bolts are used to connect adjacent panels and install support components.

[0031] See attached document Figure 1 The front side of cabinet 1, along its height, is successively equipped with instrument compartment doors corresponding to instrument compartment 11, circuit breaker compartment doors corresponding to circuit breaker compartment 12, and cable compartment doors corresponding to cable compartment 14. The instrument compartment doors are used to install the panel structures for measuring, protection, control, and display components. The circuit breaker compartment doors form the operating side for the circuit breaker trolley to enter, exit, and for maintenance. The cable compartment doors form the maintenance and operating side for cable terminals 9, current transformers 7, grounding switches 8, and cable fixing brackets 10. (Appendix) Figure 1 Cabinet 1, instrument compartment 11, circuit breaker compartment 12, and cable compartment 14 are used to define the front functional areas of the compact metal-clad high-voltage switchgear, and the front functional areas correspond to the internal functional compartments.

[0032] See attached document Figure 2 A metal partition 15 is fixed inside the cabinet 1. The metal partition 15, together with the side panels, top panel, bottom panel, and intermediate mounting plate of the cabinet 1, forms the instrument compartment 11, circuit breaker compartment 12, busbar compartment 13, and cable compartment 14. The bottom wall of the instrument compartment 11 is adjacent to the top wall of the circuit breaker compartment 12, and the bottom wall of the circuit breaker compartment 12 is adjacent to the top wall of the cable compartment 14. The busbar compartment 13 is located on the side of the circuit breaker compartment 12 facing away from the front of the cabinet 1. The above spatial relationship makes the instrument compartment 11, circuit breaker compartment 12, busbar compartment 13, and cable compartment 14 each form an independent installation space.

[0033] The metal partition 15 includes a vertical partition disposed between the busbar compartment 13 and the circuit breaker compartment 12, and a partition structure disposed between the circuit breaker compartment 12 and the cable compartment 14. The metal partition 15 separates the primary conductive connection area, the circuit breaker installation area, the cable wiring area, and the secondary component installation area. After the metal partition 15 is fixedly connected to the cabinet 1, the main busbar connection part 4 and the branch busbar 5 in the busbar compartment 13 are not directly exposed to the circuit breaker compartment 12, the cable terminal 9 in the cable compartment 14 forms an isolation boundary with the circuit breaker compartment 12, and the instrument compartment 11 forms an isolation boundary with the area where the primary conductive components are located.

[0034] Instrument compartment 11 is located inside cabinet 1. Instrument compartment 11 is used to install protective devices, measuring instruments, control switches, display elements, and secondary wiring terminals. Instrument compartment 11 is isolated from circuit breaker compartment 12 by a metal partition 15. The secondary components in instrument compartment 11 are electrically connected to the circuit breaker control circuit, the secondary circuit of current transformer 7, and the status display circuit inside the cabinet via secondary wiring harnesses. An embedded mounting panel is provided on the front side of instrument compartment 11. The embedded mounting panel is installed within or flush with the front plane of cabinet 1, so that the front structure of instrument compartment 11 is adapted to the front space of cabinet 1.

[0035] The circuit breaker compartment 12 is located inside the cabinet 1 and corresponds to the circuit breaker compartment door panel. The circuit breaker compartment 12 contains a circuit breaker trolley mounting position 2 and a trolley guide rail 21. The trolley guide rail 21 is fixed inside the circuit breaker compartment 12 and extends from the front to the rear of the cabinet 1. The trolley guide rail 21 carries the circuit breaker trolley and defines its insertion and removal paths. The circuit breaker trolley mounting position 2 is located in the area of ​​the trolley guide rail 21 and is used to accommodate the circuit breaker trolley. After the circuit breaker trolley is pushed into the circuit breaker trolley mounting position 2 along the trolley guide rail 21, the plug-in side of the circuit breaker trolley corresponds to the contact box 3. After the circuit breaker trolley is removed along the trolley guide rail 21, the circuit breaker trolley separates from the contact box 3. The relative position between the handcart guide rail 21 and the contact box 3 ensures that the insertion and movement direction of the circuit breaker handcart corresponds to the insertion interface of the contact box 3.

[0036] The contact box 3 is located between the busbar compartment 13 and the circuit breaker compartment 12. The contact box 3 is inserted through or fixed to the vertical partition of the metal partition 15, with one end of the contact box 3 facing the busbar compartment 13 and the other end facing the circuit breaker compartment 12. The end of the contact box 3 facing the busbar compartment 13 is connected to the branch busbar 5, and the end of the contact box 3 facing the circuit breaker compartment 12 is opposite to the circuit breaker truck mounting position 2. A stationary contact 31 is installed inside the contact box 3. One end of the stationary contact 31 is electrically connected to the branch busbar 5, and the other end of the stationary contact 31 faces the circuit breaker truck mounting position 2, for insertion and mating with the moving contact of the circuit breaker installed in the circuit breaker truck mounting position 2. The stationary contact 31 is fixed inside the contact box 3, and the contact box 3 provides insulating support and mounting positioning for the stationary contact 31.

[0037] The busbar compartment 13 is located within the cabinet 1 and separated from the circuit breaker compartment 12 by a metal partition 15. An insulating support 6 is fixed within the busbar compartment 13, and the insulating support 6 is fixed to the cabinet 1 or the metal partition 15. The insulating support 6 is used to install the main busbar connection part 4 and restricts the position of the main busbar connection part 4 relative to the cabinet 1. The main busbar connection part 4 is located at the insulating support 6 and is used to connect to the main busbar of the switchgear or the busbar of an adjacent cabinet 1.

[0038] A branch busbar 5 is disposed between the main busbar connection part 4 and the contact box 3. One end of the branch busbar 5 is electrically connected to the main busbar connection part 4, and the other end of the branch busbar 5 is electrically connected to the stationary contact 31 inside the contact box 3. The branch busbar 5 is used to draw electrical energy from the main busbar connection part 4 to the contact box 3. After being led out from the main busbar connection part 4, the branch busbar 5 is connected to the contact box 3 via an offset section 51. The offset section 51 is a partial connection section of the branch busbar 5, and the offset section 51 and the branch busbar 5 have a continuous conductive structure.

[0039] The offset section 51 is offset away from the connection center of the main busbar connection part 4, moving away from the adjacent phase conductors. The main busbar connection part 4 has a three-phase busbar connection position, maintaining an air insulation gap between the three phase conductors. The branch busbar 5 changes its path before entering the contact box 3 via the offset section 51, allowing the branch busbar 5 to avoid the concentrated area of ​​adjacent phase conductors near the main busbar connection part 4. An enlarged air insulation gap is formed between the offset section 51 and the main busbar connection part 4, and an air insulation interval adapted to the rated voltage level is formed between the branch busbar 5 and the adjacent phase conductors. The offset section 51 is composed of a bending section, offset section, or turning section of the branch busbar 5, and its installation does not change the electrical connection relationship between the main busbar connection part 4, the branch busbar 5, and the contact box 3.

[0040] The insulating support 6 is located within the busbar compartment 13 and connected to the main busbar connection part 4. The insulating support 6 provides insulation and fixation to the main busbar connection part 4, maintaining a fixed distance between the main busbar connection part 4 and the cabinet 1. The insulating support 6, together with the offset section 51, defines the spatial arrangement of the main busbar connection part 4 and the branch busbar 5. The branch busbar 5 forms a staggered path between the outgoing and incoming directions, ensuring that the main busbar connection part 4, the branch busbar 5, and the contact box 3 maintain their installation positions within a cabinet 1 width of 650mm.

[0041] Cable compartment 14 is located inside cabinet 1 and corresponds to the cable compartment door panel. Cable compartment 14 contains cable terminal 9, current transformer 7, grounding switch 8, and cable fixing bracket 10. Cable terminal 9 is connected to cable compartment 14 and is located on the outgoing side of the primary main circuit for connection to external cables. Cable terminal 9 extends along the cable path, which is defined by the circuit breaker, current transformer 7, and cable terminal 9 installed in the circuit breaker truck mounting position 2.

[0042] The current transformer 7 is fitted onto or correspondingly arranged on the cable path of the cable terminal 9. The current transformer 7 is used to detect the primary outgoing circuit current and provide secondary signals to the measuring or protection components in the instrument room 11. The current transformer 7 is fitted onto the outer periphery of the cable connected to the cable terminal 9, or correspondingly arranged at the conductive path position of the cable terminal 9, so that the conductive path where the cable terminal 9 is located passes through the detection area of ​​the current transformer 7.

[0043] The cable fixing bracket 10 is fixed inside the cable compartment 14. The cable fixing bracket 10 supports the cable terminal 9 or the cable connected to the cable terminal 9, and restricts the swinging and deviation of the cable within the cable compartment 14. The cable fixing bracket 10 is fixedly connected to the bottom plate of the cabinet 1 or the inner plate of the cable compartment 14. The cable fixing bracket 10 is arranged adjacent to the current transformer 7, supporting the cable path so that the cable passes through or through the detection area of ​​the current transformer 7.

[0044] Grounding switch 8 is installed inside cable compartment 14 and connected to the outgoing side of the primary main circuit. Grounding switch 8 is connected to the outgoing side of cable terminal 9 and is used to ground the circuit on the cable terminal 9 side during maintenance. Grounding switch 8 includes a grounding operating mechanism and a grounding conductive connection part, which is connected to the outgoing side of cable terminal 9. When grounding switch 8 is in the open state, the outgoing side of the primary main circuit is disconnected from the grounding circuit. When grounding switch 8 is in the closed state, the circuit on the cable terminal 9 side is connected to the grounding circuit.

[0045] See attached document Figure 3 Its electrical symbol corresponds to the appendix Figure 2 The entity structure within. (Attached) Figure 3 The main busbar side corresponds to the main busbar connection part 4, the switching element corresponds to the circuit breaker installed in the circuit breaker truck mounting position 2, the instrument transformer symbol corresponds to the current transformer 7, the grounding branch corresponds to the grounding switch 8, and the outgoing terminal corresponds to the cable terminal 9.

[0046] The physical connection relationship of the primary main circuit in this embodiment is as follows: the main busbar connection part 4 is electrically connected to one end of the branch busbar 5, and the other end of the branch busbar 5 is electrically connected to the stationary contact 31 in the contact box 3. The stationary contact 31 is used to plug into the circuit breaker installed in the circuit breaker truck mounting position 2. The outgoing side of the circuit breaker is connected to the cable path where the current transformer 7 is located. The current transformer 7 is set to the conductive path corresponding to the cable terminal 9. The cable terminal 9 is connected to the external cable, and the grounding switch 8 is connected to the outgoing side where the cable terminal 9 is located. Thus, the main busbar connection part 4, the branch busbar 5, the contact box 3, the circuit breaker installed in the circuit breaker truck mounting position 2, the current transformer 7, and the cable terminal 9 sequentially constitute the primary main circuit, and the grounding switch 8 is connected to the outgoing side of the primary main circuit.

[0047] In this embodiment, when the compact metal-clad high-voltage switchgear is in operation, electrical energy enters the busbar compartment 13 from the main busbar connection part 4. The main busbar connection part 4 is fixed in the busbar compartment 13 by the insulating support 6, and the position of the main busbar connection part 4 is defined by the insulating support 6 and the cabinet body 1. Electrical energy is transmitted from the main busbar connection part 4 to the branch busbar 5, and the branch busbar 5 is connected to the contact box 3 after passing through the offset section 51.

[0048] Because the offset section 51 is offset away from the connection center of the main busbar connection part 4, away from the adjacent phase conductors, the branch busbar 5 avoids the area where adjacent phase conductors are concentrated within the busbar compartment 13, thus creating an expanded air insulation gap between the branch busbar 5 and the main busbar connection part 4. When the width of the cabinet 1 is 650mm, the offset section 51 enables the branch busbar 5 to complete the conductive connection from the main busbar connection part 4 to the contact box 3 within the limited internal space of the cabinet 1, while maintaining an air insulation gap between the three phase conductors within the busbar compartment 13.

[0049] When the circuit breaker trolley is pushed into the circuit breaker trolley mounting position 2 along the trolley guide rail 21, the plug-in end of the circuit breaker trolley moves toward the contact box 3. After the circuit breaker trolley reaches the working position, the moving contact of the circuit breaker installed in the circuit breaker trolley mounting position 2 is plugged into the stationary contact 31 in the contact box 3. The stationary contact 31 is electrically connected to the branch busbar 5 through the contact box 3, and the primary main circuit is connected under the circuit breaker closing condition. When the circuit breaker trolley is withdrawn along the trolley guide rail 21, the moving contact of the circuit breaker separates from the stationary contact 31, and the primary main circuit is disconnected in the circuit breaker withdrawn state. The trolley guide rail 21 limits the advancing direction of the circuit breaker trolley, so that the plugging process between the circuit breaker trolley and the contact box 3 is carried out along a set path.

[0050] After the primary main circuit is connected, the current is transmitted from the main busbar connection part 4 through the branch busbar 5 and the contact box 3 to the circuit breaker installed in the circuit breaker truck mounting position 2, and then enters the cable compartment 14 through the circuit breaker outgoing side. The current transformer 7 detects the current in the conductive path where the cable terminal 9 is located, and the detected secondary current signal is transmitted to the measuring or protection components in the instrument compartment 11. The cable terminal 9 connects the primary main circuit to the external cable, and the cable fixing bracket 10 supports and limits the cable terminal 9 or the external cable. The cable fixing bracket 10 restricts the free movement of the cable terminal 9 in the width and height directions of the cabinet 1, so that the cable terminal 9 is kept in the set installation position.

[0051] In maintenance operation mode, the circuit breaker trolley is removed from the circuit breaker trolley mounting position 2 along the trolley guide rail 21, or the circuit breaker installed in the circuit breaker trolley mounting position 2 is in the open state, isolating the cable terminal 9 side from the main busbar connection part 4 side. When the grounding switch 8 is closed, the outgoing line side of the cable terminal 9 is connected to the grounding circuit, and the residual charge on the outgoing line side is released to the grounding circuit through the grounding switch 8. When the grounding switch 8 is open, the outgoing line side of the cable terminal 9 is disconnected from the grounding circuit. The connection relationship between the grounding switch 8 and the cable terminal 9 provides a maintenance grounding path for the outgoing line circuit in the cable compartment 14.

[0052] In this embodiment, the cabinet 1 is divided into an instrument compartment 11, a circuit breaker compartment 12, a busbar compartment 13, and a cable compartment 14 by metal partitions 15. The instrument compartment 11 is used for secondary control and display; the circuit breaker compartment 12 is used for the installation and connection of the circuit breaker trolley; the busbar compartment 13 is used for the installation of the main busbar connection part 4, the branch busbar 5, the insulating support 6, and the offset section 51; and the cable compartment 14 is used for the installation of the current transformer 7, the grounding switch 8, the cable terminal 9, and the cable fixing bracket 10. The metal partitions 15 isolate the functional compartments, giving each functional compartment an independent boundary for installation, maintenance, and insulation.

[0053] When the width of cabinet 1 is 650mm, the main busbar connection 4, branch busbar 5, contact box 3, circuit breaker trolley mounting position 2, current transformer 7, grounding switch 8, and cable terminal 9 are all located inside cabinet 1. The branch busbar 5 adjusts the spacing of conductive components within busbar compartment 13 via offset section 51. Contact box 3 is fixed between busbar compartment 13 and circuit breaker compartment 12 via metal partition 15. Trolley guide rail 21 aligns circuit breaker trolley mounting position 2 with contact box 3. Current transformer 7 and cable fixing bracket 10 are arranged along the cable path of cable terminal 9. This structural relationship enables this compact metal-armored high-voltage switchgear to complete primary circuit connection, circuit breaker trolley insertion, current detection, outgoing line wiring, and maintenance grounding functions within a cabinet 1 width of 650mm.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A compact metal-clad high-voltage switchgear, characterized in that, Includes a cabinet (1), in which a metal partition (15) is fixed, and the metal partition (15) and the cabinet (1) together form an instrument room (11), a circuit breaker room (12), a busbar room (13) and a cable room (14). The circuit breaker compartment (12) is fixed with a handcart guide rail (21), the handcart guide rail (21) defines the circuit breaker handcart mounting position (2), and a contact box (3) is provided on the plug-in side of the circuit breaker handcart mounting position (2). The main busbar connection part (4) is fixed inside the busbar compartment (13), and the main busbar connection part (4) is electrically connected to the contact box (3) through the branch busbar (5); The cable compartment (14) is equipped with a current transformer (7), a grounding switch (8), and a cable terminal (9).

2. A compact metal-clad high-voltage switchgear according to claim 1, characterized in that, The front side of the cabinet (1) is provided with an instrument room door panel corresponding to the instrument room (11), a circuit breaker room door panel corresponding to the circuit breaker room (12), and a cable room door panel corresponding to the cable room (14) in sequence along the height direction. The bottom wall of the instrument room (11) is adjacent to the top wall of the circuit breaker room (12), the bottom wall of the circuit breaker room (12) is adjacent to the top wall of the cable room (14), and the busbar room (13) is located on the side of the circuit breaker room (12) facing away from the front of the cabinet (1).

3. A compact metal-clad high-voltage switchgear according to claim 1, characterized in that, The metal partition (15) includes a vertical partition disposed between the busbar compartment (13) and the circuit breaker compartment (12). The contact box (3) passes through or is fixed to the vertical partition. One end of the contact box (3) faces the busbar compartment (13) and is connected to the branch busbar (5). The other end of the contact box (3) faces the circuit breaker truck mounting position (2).

4. A compact metal-clad high-voltage switchgear according to claim 3, characterized in that, The contact box (3) is provided with a stationary contact (31). One end of the stationary contact (31) is electrically connected to the branch bus (5), and the other end of the stationary contact (31) faces the circuit breaker truck mounting position (2) for plugging and cooperating with the circuit breaker installed in the circuit breaker truck mounting position (2).

5. A compact metal-clad high-voltage switchgear according to claim 1, characterized in that, The branch busbar (5) is disposed between the main busbar connection part (4) and the contact box (3). The branch busbar (5) has an offset section (51). The offset section (51) is offset away from the connection center of the main busbar connection part (4) in a direction away from the adjacent phase conductor, so that an enlarged air insulation gap is formed between the branch busbar (5) and the main busbar connection part (4).

6. A compact metal-clad high-voltage switchgear according to claim 5, characterized in that, An insulating support (6) is fixed inside the busbar compartment (13). The main busbar connection part (4) is installed on the insulating support (6). The branch busbar (5) is led out from the main busbar connection part (4) and connected to the contact box (3) through the offset section (51). The insulating support (6) is used to limit the relative position between the main busbar connection part (4) and the cabinet (1).

7. A compact metal-clad high-voltage switchgear according to claim 1, characterized in that, The handcart guide rail (21) is fixed inside the circuit breaker compartment (12). The circuit breaker handcart mounting position (2) forms a push-in path along the handcart guide rail (21). The insertion interface of the contact box (3) corresponds to the push-in path, so that the circuit breaker can be inserted into the contact box (3) after being pushed in along the handcart guide rail (21).

8. A compact metal-clad high-voltage switchgear according to claim 1, characterized in that, The cable terminal (9) is connected to the cable chamber (14), the current transformer (7) is sleeved or correspondingly arranged on the cable path of the cable terminal (9), and the cable fixing bracket (10) is fixed in the cable chamber (14) and supports the cable terminal (9) or the cable connected to the cable terminal (9).

9. A compact metal-clad high-voltage switchgear according to claim 8, characterized in that, The grounding switch (8) is installed in the cable compartment (14). The grounding switch (8) is connected to the outgoing side of the cable terminal (9) and is used to ground the circuit of the cable terminal (9) in the maintenance state.

10. A compact metal-clad high-voltage switchgear according to claim 1, characterized in that, The main busbar connection (4), branch busbar (5), contact box (3), circuit breaker, current transformer (7) and cable terminal (9) installed in the circuit breaker truck installation position (2) constitute a primary main circuit in sequence, and the grounding switch (8) is connected to the outgoing side of the primary main circuit.

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