CN118739042A - A compact structure of medium voltage switchgear - Google Patents

Abstract

The present application relates to a compact structure of a medium-voltage switchgear, wherein the cabinet body is divided into four compartments, namely, an instrument room, a busbar room, a circuit breaker room, and a cable room, by metal partitions; a horizontal busbar group is arranged in the busbar room; the busbar group is connected to the circuit breaker through an upper branch busbar group; by optimizing the horizontal busbar and the upper branch busbar group in the busbar compartment and optimizing the insulation method of the mutual inductor, the earthing switch, and the cable terminal in the cable compartment, the cabinet type is compact under air insulation conditions, a first inclined portion and a third inclined portion are arranged in the busbar compartment, and a triangular arrangement is formed between the first input terminal, the second input terminal, and the third input terminal, so that in the horizontal width direction, only three phase spacings need to be maintained, compared with the traditional horizontal parallel arrangement requiring four phase spacings, this structure shortens the phase spacing, and while meeting safety requirements, theoretically can reduce the width occupied by the safe phase spacing of the original cabinet by 25%; it can be applicable to 10‑24KV medium-voltage switchgear and used in scenarios with narrow space.

Description

A compact structure of medium voltage switchgear

Technical Field

The present application relates to the field of switch cabinets, and in particular to a compact structure of a medium-voltage switch cabinet.

Background Art

Switchgear is a common complete set of switchgear. At present, the domestic indoor removable medium-voltage complete set of switchgear adopts the product design concept introduced from abroad in the 1990s. The structural design tends to be conservative and the size is large.

According to IEC62271-200 "1kV~52kV AC metal-enclosed switches and control equipment";

Or GB/T3906 "3.6~40.5kV AC metal-enclosed switchgear and control equipment";

Or DL/T 404-1997 "Technical Conditions for Ordering Indoor AC High Voltage Switchgear" 6.4.1 stipulates:

The electrical safety distance of 12kV metal enclosed switchgear is:

-1 The clear distance between conductor and ground is 125mm;

-2 Clearance distance between conductors of different phases 125mm;

The electrical safety distance of 24KV metal enclosed switchgear is:

-1 Clearance distance from conductor to ground: 180mm;

-2 Clearance distance between conductors of different phases 180mm;

According to the above standards, the width of a general 12kV/1250A/31.5KA metal-enclosed switchgear is 800mm, and the width of a 24KV/1250A/31.5KA metal-enclosed switchgear is 1000mm. Switchgear is generally used in sets. The overall width of 10-15 devices used in sets needs to be changed urgently under the current trend of tight urban land use and compact modularization of electricity usage scenarios.

In the existing medium-voltage switchgear switchgear, the insulation strength standard requirements are met by adding interphase insulation partitions (busbar room and cable room) between each live body to reduce the interphase distance, thereby achieving the purpose of compacting the width of the switchgear. Under the actual conditions of uneven distribution room environment in my country, the insulation partitions have the risk of reduced insulation strength and even failure breakdown during long-term operation under the influence of strong electric fields, dust, water vapor, etc.

Therefore, a more compact air-insulated switchgear with an overall structural design that complies with standards and insulation strength that meets standards is required.

Summary of the invention

Based on this, it is necessary to propose a compact structure of air-insulated medium-voltage switchgear based on the traditional structure and size.

The present application provides a compact structure of a medium-voltage switch cabinet, comprising a cabinet body, wherein the cabinet body is divided into an instrument room, a busbar room, a circuit breaker room and a cable room by a metal partition, wherein the busbar room and the cable room are located at the rear side of the circuit breaker room, wherein a circuit breaker is arranged in the circuit breaker room, wherein the input end of the circuit breaker is located in the busbar room, and the output end of the circuit breaker is located in the cable room, wherein a horizontal busbar group connected to an adjacent cabinet is arranged in the busbar room; wherein the busbar group is connected to the circuit breaker through an upper branch busbar group;

The busbar layout design of the busbar room, the input end of the circuit breaker is connected with the first upper contact box, the second upper contact box and the third upper contact box in sequence, the access end of the first upper contact box is provided with a first inclined portion inclined toward the second upper contact box, the access end of the third upper contact box is provided with a third inclined portion inclined toward the second upper contact box, the angle a between the first inclined portion and the vertical direction is 10-15 degrees, the angle b between the third inclined portion and the vertical direction is 10-15 degrees, the distance between the entrance of the first inclined portion, the entrance of the third inclined portion and the entrance of the second upper contact box is greater than the safe phase spacing;

The cable room mutual inductor, grounding switch, cable connector and related connection design, the three output ends of the circuit breaker are the cable room contact box, the cable room contact box is arranged horizontally, and the contact box is provided with connecting copper bars and copper rods connected in sequence, the connecting copper bars are connected with grounding knife conductive rods, the grounding knife conductive rods are connected to the grounding switch, the cable copper rods are sleeved with current mutual inductors, and the ends of the cable copper rods are connected to external wires.

In one embodiment, the three output ends of the circuit breaker are respectively provided with a lower contact box, one end of each of the isolation frames is fixed to the side wall of the cable chamber, each of the isolation frames is provided with a copper busbar connection port, a ground wire connection port and a cable output port, and each of the isolation frames is provided with a plurality of annular protrusions.

In one embodiment, the upper end of the connecting copper bar is in the copper bar connection port, the copper bar connection port is clamped at the outlet end of the lower contact box, one end of the ground knife conductive rod is in the ground wire connection port, and the lower end of the cable copper rod is in the cable outlet and connected to the external wire. All live parts in the cable room (including connecting cables and connectors) are wrapped in an insulator made of epoxy resin and silicone rubber.

In one embodiment, the busbar chamber includes an upper partition, an outer partition, a lower partition and an inner partition.

In one embodiment, the busbar group includes a first busbar, a third busbar, and a second busbar arranged in parallel with each other, the first busbar is fixed on an inner partition, the third busbar is fixed on an outer partition, and the second busbar is fixed on an outer partition, the first busbar and the third busbar are located below the top plate of the busbar room, and the second busbar is located below the third busbar.

In one embodiment, the upper branch busbar group includes a first upper branch busbar, a second upper branch busbar and a third upper branch busbar, the first upper contact box and the first busbar are connected through the first upper branch busbar, the second upper contact box and the second busbar are connected through the second upper branch busbar, and the third upper contact box and the third busbar are connected through the third upper branch busbar.

In one embodiment, the first upper branch busbar includes a first inclined section and a first direct connection section, the upper end of the first inclined section is located at the first input end of the first inclined portion, and the two ends of the first direct connection section are respectively connected to the first input end and the first busbar;

The second upper branch busbar comprises a second vertical section and a second direct-connection section, the second vertical section is vertically arranged in the second upper contact box, one end of the second direct-connection section is located at the second input end of the second upper contact box, and the other end of the second direct-connection section is connected to the second busbar;

The third upper branch busbar includes a third inclined section and a third direct-connected section. The third inclined section is located in the third inclined portion and maintains the same inclination angle. The upper end of the third inclined section is located at the third input end of the third inclined portion. Both ends of the third direct-connected section are respectively connected to the third input end and the third busbar.

In one embodiment, the first inclined portion and the third inclined portion are symmetrically arranged on both sides of the second upper contact box.

In one embodiment, an angle a between the first inclined portion and the vertical direction is 11 degrees, and an angle b between the third inclined portion and the vertical direction is 11 degrees.

In one embodiment, the distance between the first input end and the third input end is greater than the distance between the first input end or the third input end and the edge of the cabinet.

Technical advantages of this application:

1. First, by providing the first inclined portion and the third inclined portion, the first input end, the second input end and the third input end are arranged in a triangle. Therefore, in the horizontal width direction, only three safe phase spacings need to be maintained. Compared with the traditional horizontal parallel arrangement, four safe phase spacings are required. This structure shortens the number of safe phase spacings. While meeting safety requirements, it can theoretically reduce the width of the original cabinet by 25% of the safe phase spacing.

2. At the same time, the first busbar, the third busbar and the second busbar are arranged in an L shape, the second busbar is set at the lowest point, the first busbar and the third busbar are set at the upper high point, the first direct section or the third direct section can be connected to the first busbar or the third busbar upwards respectively, and the second direct section of the second upper branch busbar can be directly connected to the second busbar horizontally, so that the second direct section and the first direct section or the third direct section extend in three different directions in three-dimensional space. On the basis of maintaining a safe phase spacing between the first input terminal, the second input terminal and the third input terminal, the interval between the second direct section and the first direct section or the third direct section is getting larger and larger to ensure safety. This structure can be applied to 10-24KV medium-voltage switchgear and used in scenarios with narrow space;

3. The three output ends of the circuit breaker are respectively connected with an isolation connection device, which integrates and seals the current transformer, the ground knife conductive rod and the cable copper rod in a closed isolation frame. Compared with the traditional form of using partitions for isolation and dispersive installation of components, this isolation connection device saves the separation space for multiple components to be separately set at the bottom, and can further reduce the volume of the cabinet;

4. Through sealed isolation, three isolation connection devices can be directly arranged in parallel. The copper busbars at each output end are isolated by two layers of isolation frame thickness, and fixed phase spacing is not required, which can further reduce the volume of the cabinet;

5. A plurality of annular protrusions are arranged on the surface of the isolation frame, so that the entire isolation frame increases the inter-phase creepage distance and improves the inter-phase insulation.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The drawings and descriptions of the exemplary embodiments of this application are used to explain this application and do not constitute an improper limitation on this application.

FIG1 is an overall layout diagram of a compact structure of a medium voltage switchgear provided in one embodiment of the present application.

FIG. 2 is a first schematic diagram of an internal three-dimensional structure provided in an embodiment of the present application.

FIG. 3 is a second schematic diagram of an internal three-dimensional structure provided in an embodiment of the present application.

FIG. 4 is an enlarged view of a portion of the structure of FIG. 3 in one embodiment of the present application.

FIG. 5 is a three-dimensional schematic diagram of an upper branch busbar group provided in an embodiment of the present application.

FIG. 6 is a schematic diagram of the three-dimensional structure of an isolation connection device provided in an embodiment of the present application.

FIG. 7 is a schematic diagram of the internal structure of an isolation connection device provided in an embodiment of the present application.

FIG8 is a schematic diagram of an upper branch busbar group of a 12KV-550mm cabinet provided in another embodiment of the present application.

FIG9 is a schematic diagram of an upper branch busbar group of a 24KV-800mm cabinet provided in another embodiment of the present application.

FIG. 10 is a schematic diagram of a conventional design layout structure of an existing switch cabinet.

Reference numerals: cabinet 1; instrument room 11; busbar room 12; upper partition 121; outer partition 122; lower partition 123; inner partition 124; trolley room 13; circuit breaker 131; lower contact box 132; cable room 14;

Busbar group 2; first busbar 21; third busbar 23; second busbar 22;

First upper contact box 31; first inclined portion 311; first input end 3110;

Second upper contact box 32; second input terminal 320;

The third upper contact box 33; the third inclined portion 331; the third input end 3310;

Upper branch busbar group 4;

The first upper branch busbar 41; the first inclined section 411; the first straight section 412;

The second upper branch busbar 42; the second vertical section 421; the second direct connection section 422;

The third upper branch busbar 43; the third inclined section 431; the third direct connection section 432;

Isolation connection device 5; isolation frame 50; copper busbar connection port 501; ground wire connection port 502; cable outlet 503; annular protrusion 504; connecting copper busbar 51; cable copper rod 52; ground knife conductive rod 53; grounding switch 6; current transformer 54; external wire 7.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

As shown in Figure 10: For the existing compact switchgear, taking 10KV as an example, if calculated according to the minimum safe spacing distance, 125mm is the safe phase spacing, 60mm is the minimum width of the upper branch busbar, and 125mm*4+60mm*3=680mm does not meet the size requirement of 550mm for miniaturized switchgear. If the spacing needs to be reduced, it is necessary to add insulating partitions in the middle of the three upper branch busbars to improve the insulation strength. However, under the actual conditions of uneven distribution room environment in my country, the insulating partitions are exposed to strong electric fields, dust, water vapor, etc. during long-term operation, and there is a risk of reduced insulation strength or even failure and breakdown.

The present application provides a compact structure of a medium voltage switch cabinet.

As shown in FIGS. 1 to 9 , in one embodiment, a compact structure of a medium-voltage switchgear includes a cabinet 1, wherein the cabinet 1 is divided into an instrument room 11, a busbar room 12, a trolley room 13, and a cable room 14 by a detachable metal partition, wherein the busbar room 12 and the cable room 14 are located on the left side of the trolley room 13, wherein a circuit breaker 131 is disposed in the trolley room 13, wherein an input end of the circuit breaker 131 is located in the busbar room 12, and an output end of the circuit breaker 131 is located in the cable room 14, wherein a busbar group 2 is disposed in the busbar room 12; the busbar group 2 is connected to the circuit breaker 131 through an upper branch busbar group 4;

The input and output ends of the circuit breaker 131 are both provided with three contact boxes. The input end in the busbar chamber 12 is respectively arranged in sequence from left to right, namely, the first upper contact box 31, the second upper contact box 32 and the third upper contact box 33. The access end of the first upper contact box 31 is provided with a first inclined portion 311 inclined toward the second upper contact box 32, and the access end of the third upper contact box 33 is provided with a third inclined portion 331 inclined toward the second upper contact box 32. The angle a between the first inclined portion 311 and the vertical direction is 10-15 degrees, and the angle b between the third inclined portion 331 and the vertical direction is 10-15 degrees; the distances between the entrances of the first inclined portion 311, the entrances of the third inclined portion 331 and the entrances of the second upper contact box 32 are greater than the safe phase spacing;

By providing the first inclined portion 311 and the third inclined portion 331, the first input end 3110, the second input end 320 and the third input end 3310 are arranged in a triangle. Therefore, in the horizontal width direction, only three safe phase spacings need to be maintained. Compared with the traditional horizontal parallel arrangement, which requires four phase spacings, this layout shortens the phase spacing. While meeting safety requirements, it can theoretically reduce the width of the original cabinet by 25% of the safe phase spacing.

As shown in Figure 1-2: the busbar chamber 12 includes an upper partition 121, an outer partition 122, a lower partition 123 and an inner partition 124, the busbar group 2 includes a first busbar 21, a third busbar 23 and a second busbar 22 arranged in parallel with each other, the first busbar 21 is fixed on the inner partition 124, the third busbar 23 is fixed on the outer partition 122, the second busbar 22 is fixed on the outer partition 122, the first busbar 21 and the third busbar 23 are below the top plate 121 of the busbar chamber 12, and the second busbar 22 is below the third busbar 23.

As shown in Figure 3-5:

The upper branch busbar group 4 includes a first upper branch busbar 41, a second upper branch busbar 42 and a third upper branch busbar 43. The first upper contact box 31 and the first busbar 21 are connected via the first upper branch busbar 41, the second upper contact box 32 and the second busbar 22 are connected via the second upper branch busbar 42, and the third upper contact box 33 and the third busbar 23 are connected via the third upper branch busbar 43.

The first upper branch busbar 41 includes a first inclined section 411 and a first straight section 412. The upper end of the first inclined section 411 is located at the first input end 3110 of the first inclined portion 311. Both ends of the first straight section 412 are respectively connected to the first input end 3110 and the first busbar 21.

The second upper branch busbar 42 includes a second vertical section 421 and a second direct section 422. The second vertical section 421 is vertically arranged in the second upper contact box 32. One end of the second direct section 422 is located at the second input end 320 of the second upper contact box 32. The other end of the second direct section 422 is connected to the second busbar 22.

The third upper busbar 43 includes a third inclined section 431 and a third direct-connection section 432. The third inclined section 431 is located in the third inclined portion 331 and maintains the same inclination angle. The upper end of the third inclined section 431 is located at the third input end 3310 of the third inclined portion 331. The two ends of the third direct-connection section 432 are respectively connected to the third input end 3310 and the third busbar 23.

The first busbar 21, the third busbar 23 and the second busbar 22 are arranged in an L shape, the second busbar 22 is set at the lowest point, the first busbar 21 and the third busbar 23 are set at the upper high point, the first direct section 412 or the third direct section 432 can be connected to the first busbar 21 or the third busbar 23 upward respectively, and the second direct section 422 of the second upper busbar 42 can be directly connected to the second busbar 22 horizontally, so that the second direct section 422 and the first direct section 412 or the third direct section 432 extend in three different directions in three-dimensional space.

On the basis of maintaining a safe phase spacing between the first input terminal 3110, the second input terminal 320 and the third input terminal 3310, the interval between the second direct section 422 and the first direct section 412 or the third direct section 432 becomes larger and larger to ensure safety. This structure can be applied to 10-24KV medium-voltage switchgear and can be used in scenarios with narrow space. The relevant angles and spacings can be specifically adjusted according to domestic and foreign requirements and different transmission voltage requirements to meet the needs of miniaturization and compactness. The phase spacing is much larger than the safety distance, and there is no need for concealed transfer partitions, and the safety meets the standards.

As shown in Figures 6-7: the three output ends of the circuit breaker 131 are respectively connected to the isolation connection devices 5, and each isolation connection device 5 is arranged horizontally. Each isolation connection device 5 includes an isolation frame 50, and the isolation frame 50 is provided with a connecting copper bus 51 and a cable copper rod 52 connected in sequence. The connecting copper bus 51 is connected to a ground knife conductive rod 53, and the ground knife conductive rod 53 is connected to the grounding switch 6. A current transformer 54 is sleeved on the cable copper rod 52, and the end of the cable copper rod 52 is connected to an external conductor 7.

The three output ends of the circuit breaker 131 are respectively provided with lower contact boxes 132. One end of each isolation frame 50 is fixed on the side wall of the cable chamber 14. Each isolation frame 50 is provided with a copper busbar connection port 501, a ground wire connection port 502 and a cable output port 503. Each isolation frame 50 is provided with a plurality of annular protrusions 504. The plurality of annular protrusions 504 provided on the surface of the isolation frame 50 increase the phase-to-phase creepage distance of the entire isolation frame and improve the phase-to-phase insulation.

The upper end of the connecting copper bar 51 is located in the copper bar connecting port 501, and the copper bar connecting port 501 is clamped on the outlet end of the lower contact box 132. One end of the ground knife conductive rod 53 is located in the ground wire connecting port 502. The lower end of the cable copper rod 52 is located in the cable output port 503 and is connected to the external wire 7.

The three output ends of the circuit breaker are respectively connected with an isolation connection device 5, which integrates and seals the current transformer 54, the ground knife conductive rod 53 and the cable copper rod 52 in a closed isolation frame 50. Compared with the traditional form of using partitions for isolation and dispersing the components, the isolation connection device 5 saves the spacing space at the bottom where multiple components are separately set, and can further reduce the volume of the cabinet.

As shown in Figures 8-9; the first inclined portion 311 and the third inclined portion 331 are symmetrically arranged on both sides of the second upper contact box 32, the angle a between the first inclined portion 311 and the vertical direction is 11 degrees, the angle b between the third inclined portion 331 and the vertical direction is 11 degrees, and the distance between the first input end 3110 and the third input end 3310 is greater than the distance between the first input end 3110 or the third input end 3310 and the edge of the cabinet 1.

As shown in FIG8 , Example 1 The existing 12KV switch cabinet is 800mm

The 12KV switch cabinet is made into a compact switch cabinet of 550mm. It does not need to use an insulating partition. The first inclined portion 311 is mounted on the first inclined section 411, and the third inclined portion 331 is mounted on the third inclined section 431. The middle parts are all insulated in each contact box. The upper busbars at the first input terminal 3110, the second input terminal 320, and the third input terminal 3310 are exposed parts, and a safety distance of more than 125mm needs to be maintained.

Phase spacing: the included angle a between the first inclined portion 311 and the vertical direction is 15 degrees, and the included angle b between the third inclined portion 331 and the vertical direction is 15 degrees.

The phase distance L10 between the first input end 3110 and the edge of the cabinet 1 is 150.8 mm>125 mm;

The phase distance L30 between the third input terminal 3310 and the edge of the cabinet 1 is 150.8 mm>125 mm;

The distance L12 between the first input end 3110 and the second input end 320 is 142.3 mm>125 mm;

The distance L23 between the second input end 320 and the third input end 3310 is 142.3 mm>125 mm;

The distance L13 between the first input end 3110 and the third input end 3310 is 125.6 mm>125 mm;

The above safety distances are all greater than the standard safety distance of 125mm. Since the phase spacing of L12, L23, L13, L10, and L30 is much greater than 125mm, there is still enough space, so the angles a and b can still be adjusted downward, or they do not have to be designed symmetrically. The width of the copper busbar is 60mm*2=120mm.

The overall cabinet width is 150.8mm+125.6mm+150.8mm+120mm=547.2mm, and the remaining part is the cabinet thickness, which fully meets the safety index requirements of each phase of the 550mm model 12kV/1250A/31.5KA metal-enclosed switchgear, and there is no need to add partition design.

As shown in FIG9 , Example 2 The existing 24KV switch cabinet is 1000mm

The 24KV switch cabinet is made into a compact switch cabinet of 800mm. There is no need to use an insulating partition. The first inclined portion 311 is mounted on the first inclined section 411, and the third inclined portion 331 is mounted on the third inclined section 431. The middle part is insulated. The upper busbars at the first input terminal 3110, the second input terminal 320, and the third input terminal 3310 are exposed parts, and a safety distance of more than 180mm needs to be maintained.

Phase spacing: the included angle a between the first inclined portion 311 and the vertical direction is 11 degrees, and the included angle b between the third inclined portion 331 and the vertical direction is 11 degrees.

The distance L10 between the first input end 3110 and the edge of the cabinet 1 is 209.5 mm>180 mm;

The phase distance L30 between the third input terminal 3310 and the edge of the cabinet 1 is 209.5 mm>180 mm;

The distance L12 between the first input end 3110 and the second input end 320 is 198.7 mm>180 mm;

The distance L23 between the second input end 320 and the third input end 3310 is 198.7 mm>180 mm;

The distance L13 between the first input end 3110 and the third input end 3310 is 214.1 mm>180 mm;

The above safety distances are all greater than the standard safety distance of 180mm. Since the phase spacing of L12, L23, L13, L10, and L30 is much greater than 180mm, there is still enough space, so the angles a and b can still be slightly adjusted. The width of the copper busbar is 80mm*2=160mm.

The overall cabinet width is 209.5mm+209.5mm+214.1mm+160mm=793.1mm, which fully meets the safety index requirements of each phase of the 800mm compact 24KV/1250A/31.5KA metal-enclosed switchgear, and there is no need to add partition design.

In summary: the three-dimensional triangular layout structure designed in the present invention performs a reasonable spatial layout in the three-dimensional direction, and on the premise of ensuring safety, the volume of the entire switch cabinet is further reduced and compacted, thereby improving the utilization rate of factory land.

The technical features of the above-described embodiments may be combined arbitrarily, and the execution order of the method steps is not limited. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims (10)

1. The utility model provides a compact structure of medium voltage switchgear, includes cabinet body (1), divide into instrument room (11), busbar room (12), handcart room (13) and cable room (14) by detachable metal baffle in cabinet body (1), characterized in that, busbar room (12) and cable room (14) are in the left side of handcart room (13), be provided with circuit breaker (131) in handcart room (13), the input of circuit breaker (131) is in busbar room (12), the output of circuit breaker (131) is in cable room (14), be provided with busbar group (2) in busbar room (12); the busbar group (2) is connected with a breaker (131) through an upper branch busbar group (4);

the input end of the circuit breaker (131) is sequentially connected with a first upper contact box (31), a second upper contact box (32) and a third upper contact box (33), a first inclined part (311) inclined towards the second upper contact box (32) is arranged at the access end of the first upper contact box (31), a third inclined part (331) inclined towards the second upper contact box (32) is arranged at the access end of the third upper contact box (33), an included angle a between the first inclined part (311) and the vertical direction is 10-15 degrees, an included angle b between the third inclined part (331) and the vertical direction is 10-15 degrees, and the distance between an inlet of the first inclined part (311), an inlet of the third inclined part (331) and an inlet of the second upper contact box (32) is larger than the safety phase distance;

Three output of circuit breaker (131) are connected with isolation connecting device (5) respectively, and each isolation connecting device (5) transverse arrangement, each isolation connecting device (5) are including isolating framework (50), be equipped with connection copper bar (51) and cable bar (52) that connect gradually in isolating framework (50), be connected with ground sword conducting rod (53) on connection copper bar (51), ground sword conducting rod (53) connect earthing switch (6), the cover is equipped with current transformer (54) on cable bar (52), the end connection external wire (7) of cable bar (52).

2. The compact structure of medium voltage switchgear according to claim 1, characterized in that the three output ends of the circuit breaker (131) are respectively sleeved with a lower contact box (132), one end of each isolation frame (50) is fixed on the side wall of the cable chamber (14), each isolation frame (50) is provided with a copper bar connection port (501), a ground wire connection port (502) and a cable output port (503), and a plurality of annular protrusions (504) are arranged on the surface of each isolation frame (50).

3. The compact structure of the medium voltage switchgear according to claim 2, characterized in that the upper end of the connection copper bar (51) is located in a copper bar connection port (501), the copper bar connection port (501) is clamped at the outlet end of the lower contact box (132), one end of the ground knife conductive rod (53) is located in a ground wire connection port (502), and the lower end of the cable copper rod (52) is located in a cable output port (503) and is linked with an external lead (7).

4. The compact structure of a medium voltage switchgear according to claim 1, characterized in that the busbar compartment (12) comprises an upper partition (121), an outer partition (122), a lower partition (123) and an inner partition (124).

5. The compact structure of medium voltage switchgear according to claim 4, characterized in that the busbar group (2) comprises a first busbar (21), a third busbar (23) and a second busbar (22) arranged parallel to each other, the first busbar (21) being fixed on the inner partition (124), the third busbar (23) being fixed on the outer partition (122), the second busbar (22) being fixed on the outer partition (122), the first busbar (21) and the third busbar (23) being under the top plate (121) of the busbar chamber (12), the second busbar (22) being under the third busbar (23).

6. The compact structure of medium voltage switchgear according to claim 5, characterized in that said upper branch busbar set (4) comprises a first upper branch busbar (41), a second upper branch busbar (42) and a third upper branch busbar (43), said first upper contact box (31) and said first busbar (21) being connected by means of the first upper branch busbar (41), said second upper contact box (32) and said second busbar (22) being connected by means of the second upper branch busbar (42), said third upper contact box (33) and said third busbar (23) being connected by means of the third upper branch busbar (43).

7. The compact structure of medium voltage switchgear according to claim 6, characterized in that said first upper branch busbar (41) comprises a first inclined section (411) and a first straight section (412), the upper end of said first inclined section (411) being at a first input end (3110) of a first inclined section (311), the two ends of said first straight section (412) being connected to a first input end (3110) and to said first busbar (21), respectively;

The second upper branch bus (42) comprises a second vertical section (421) and a second direct connection section (422), the second vertical section (421) is vertically arranged in the second upper contact box (32), one end of the second direct connection section (422) is positioned at a second input end (320) of the second upper contact box (32), and the other end of the second direct connection section (422) is connected with the second bus bar (22);

The third upper branch bus (43) comprises a third inclined section (431) and a third direct connection section (432), the third inclined section (431) is located in a third inclined portion (331) and keeps the same inclined angle, the upper end of the third inclined section (431) is located at a third input end (3310) of the third inclined portion (331), and two ends of the third direct connection section (432) are respectively connected with the third input end (3310) and the third bus bar (23).

8. The compact structure of the medium voltage switchgear according to claim 7, characterized in that the first (311) and third (331) inclined portions are symmetrically arranged on both sides of the second upper contact box (32).

9. The compact structure of medium voltage switchgear according to claim 8, characterized in that the first inclined portion (311) has an angle a of 11 degrees with the vertical direction and the third inclined portion (331) has an angle b of 11 degrees with the vertical direction.

10. The compact structure of medium voltage switchgear according to claim 9, characterized in that the distance between the first input terminal (3110) and the third input terminal (3310) is greater than the distance between the first input terminal (3110) or the third input terminal (3310) and the edge of the cabinet (1).