A normal pressure sealed air insulated ring main unit

Abstract

The present invention provides a normal pressure sealed air insulated ring network cabinet, comprising a cabinet body, a vacuum circuit breaker unit, a disconnector, a first partition, a second partition, a box body and a circuit breaker shifting mechanism, wherein a busbar chamber, an air compartment and a cable compartment are formed inside the cabinet body, a box body is arranged in the air compartment, and the vacuum circuit breaker unit and the disconnector are both arranged in the box body; the busbar extends into the box body; the branch busbar extends into the box body and is electrically connected to the disconnector; the disconnector comprises a plurality of connecting parts, each of which is linearly arranged and spaced apart, the circuit breaker shifting mechanism is arranged at one end of the box body, and is linearly arranged along the arrangement direction of each connecting part of the disconnector, and the circuit breaker shifting mechanism is connected to the vacuum circuit breaker unit; the circuit breaker shifting mechanism drives the moving contact of the vacuum circuit breaker unit to selectively connect to the busbar, and at the same time drives the static contact of the vacuum circuit breaker unit to selectively connect to each connecting part of the disconnector.

Description

Technical Field

[0001] The invention relates to the technical field of power supply electrical equipment, and in particular to a normal pressure sealed air insulated ring network cabinet. Background Art

[0002] Ring main unit is an electrical device that uses high-voltage switchgear to form an interval-type ring network power supply unit. It is mainly used in distribution stations or box-type substations in public buildings, industrial and mining enterprises, and residential areas. The ring main unit distributes the electric energy transmitted by the power supply to the trunk line to the outside through high-voltage switches. It is an important switching device for ring network power supply and terminal power supply, and its short-circuit breaking capacity reaches the level of switchgear.

[0003] In order to extinguish arc reliably, the ring main unit usually adopts sulfur hexafluoride gas or solid insulating medium as arc extinguishing or insulating medium. However, sulfur hexafluoride is a greenhouse gas, and its greenhouse effect is 23,000 times that of carbon dioxide. It is one of the greenhouse gases that are prohibited from emission. There is a risk of leakage when using sulfur hexafluoride in the ring main unit. The solid epoxy resin material of the solid insulating ring main unit has the disadvantages of being difficult to decompose and easy to crack, and is difficult to recycle and process. Therefore, it is necessary to develop a ring main unit that can stably extinguish arcs and insulate under normal pressure. Summary of the invention

[0004] In view of this, the present invention proposes a normal pressure sealed air insulated ring main unit with a reliable arc extinguishing structure and without using greenhouse gas.

[0005] The technical solution of the present invention is implemented as follows: the present invention provides a normal pressure sealed air insulated ring network cabinet, comprising a cabinet (1), a vacuum circuit breaker unit (2), an isolating switch (3), a first partition (4), a second partition (5), a box (6) and a circuit breaker shifting mechanism (7); the cabinet (1) is hollow inside, and a first partition (4) and a second partition (5) are arranged in intervals inside the cabinet (1); the first partition (4) and the cabinet (1) together form a closed busbar chamber (10); the first partition (4), the second partition (5) and the cabinet (1) together form a closed air compartment (11); the second partition (5) and the cabinet (1) together form a closed cable chamber (12); wherein:

[0006] A box (6) is arranged in the air compartment (11), the box (6) is hollow inside, and the vacuum circuit breaker unit (2) and the disconnector (3) are both arranged in the box (6); a busbar (8) is arranged at one end of the first partition (4) close to the busbar chamber (10), and the busbar (8) passes through the first partition (4) and the box (6) in sequence and extends into the box (6); a branch busbar (9) is arranged at one end of the second partition (5) close to the cable chamber (12), and the branch busbar (9) passes through the second partition (5) and the box (6) in sequence and extends into the box (6) and is electrically connected to the disconnector (3);

[0007] The isolating switch (3) comprises a plurality of connecting parts, each of which is linearly arranged and spaced apart, one end of each connecting part being fixedly connected to one end of the box body (6) close to the second partition (5), and the other end of the connecting part extending in the direction of the first partition (4);

[0008] The circuit breaker shifting mechanism (7) is arranged at one end of the box (6) close to the first partition (4) or one end close to the second partition (5), and the circuit breaker shifting mechanism (7) is linearly arranged along the extended line direction of the arrangement of the connecting parts of the disconnector (3) and penetrates the box (6), the circuit breaker shifting mechanism (7) is sealedly connected to the box (6), and the circuit breaker shifting mechanism (7) is also connected to the vacuum circuit breaker unit (2);

[0009] The vacuum circuit breaker unit (2) comprises a stationary contact (21) and a moving contact (22), and the stationary contact (21) and the moving contact (22) are respectively arranged at two ends of the vacuum circuit breaker unit (2) close to the first partition (4) and the second partition (5); the circuit breaker shifting mechanism (7) drives the moving contact (22) of the vacuum circuit breaker unit (2) to selectively slide and connect with the busbar (8) extending into the box (6), and at the same time, the circuit breaker shifting mechanism (7) drives the stationary contact (21) of the vacuum circuit breaker unit (2) to selectively electrically connect with various connecting parts of the disconnector (3) in the box (6).

[0010] On the basis of the above technical solution, preferably, the circuit breaker displacement mechanism (7) comprises a linear motion mechanism (71), a slide groove (72), at least two swing rods (73), a limit rod (74) and a connecting plate (75); the slide groove (72) is fixedly arranged on the inner surface of the box (6); the linear motion mechanism (71) penetrates the box (6) and is sealed with the box (6); the movable end of the linear motion mechanism (71) is embedded in the slide groove (72); the movable end of the linear motion mechanism (71) can reciprocate linearly relative to the box (6); a swing rod (73) is arranged on the movable end of the linear motion mechanism (71); A rod (73) is provided, one end of the swing rod (73) is hingedly connected to the movable end of the linear motion mechanism (71), the other end of the swing rod (73) is hingedly connected to the connecting plate (75), and the connecting plate (75) is fixedly connected to the vacuum circuit breaker unit (2); a limit rod (74) is provided between the swing rod (73) and the cabinet (1), one end of the limit rod (74) is hingedly connected to the inner surface of the cabinet (1), and the other end of the limit rod (74) is hingedly connected to one end of the swing rod (73) close to the connecting plate (75); the reciprocating linear motion of the movable end of the linear motion mechanism (71) drives the vacuum circuit breaker unit to swing relative to the cabinet (6).

[0011] Further preferably, the reciprocating linear motion of the movable end of the linear motion mechanism (71) drives the vacuum circuit breaker unit (2) to swing relative to the box (6) in an arc-shaped trajectory, and the disconnector (3) comprises a connection part A, a connection part B and a connection part C, and the ends of the connection parts A, B and C away from the second partition plate (5) are all located on the arc-shaped swing trajectory;

[0012] When the vacuum circuit breaker unit (2) swings relative to the cabinet (1) to an end position of the arc, the static contact (21) of the vacuum circuit breaker unit (2) contacts the end of the connection part A away from the second partition (5), and the moving contact (22) of the vacuum circuit breaker unit (2) is slidably connected to the busbar extending into the air compartment (11); when the vacuum circuit breaker unit (2) swings relative to the cabinet (1) to an end position of the arc, the static contact (21) of the vacuum circuit breaker unit (2) contacts the end of the connection part C away from the second partition (5), and the moving contact (22) of the vacuum circuit breaker unit (2) floats; when the vacuum circuit breaker unit (2) swings relative to the cabinet (1) to the lowest point position of the arc, the static contact (21) of the vacuum circuit breaker unit (2) contacts the end of the connection part B away from the second partition (5), and the moving contact (22) of the vacuum circuit breaker unit (2) is slidably connected to the busbar extending into the air compartment (11).

[0013] More preferably, when the stationary contact (21) of the vacuum circuit breaker unit (2) is in contact with the connection part A, and the moving contact (22) is slidably connected to the busbar (8), the vacuum circuit breaker unit (2) is in a closed working state; when the stationary contact (21) of the vacuum circuit breaker unit (2) is in contact with the connection part B, and the moving contact (22) is slidably connected to the busbar (8), the vacuum circuit breaker unit (2) is in a grounded state; when the stationary contact (21) of the vacuum circuit breaker unit (2) is in contact with the connection part C, the vacuum circuit breaker unit (2) is in a separated working state.

[0014] Still more preferably, the static contact (21) and the moving contact (22) of the vacuum circuit breaker unit (2) and the ends of the connection parts A, B and C away from the second partition plate (5) are all plate-shaped.

[0015] More preferably, the longitudinal cross-section of the busbar (8) extending into the box (6) is L-shaped, and the surface of the busbar (8) extending into the box (6) matches the shape of the moving contact (22) of the vacuum circuit breaker unit (2).

[0016] Further preferably, the linear motion mechanism (71) is a screw guide mechanism or an electric push rod mechanism.

[0017] Further preferably, the circuit breaker displacement mechanism (7) is made of insulating material.

[0018] On the basis of the above technical solution, preferably, the air compartment (11) and the box body (6) are filled with dry air at normal pressure.

[0019] The atmospheric pressure sealed air insulated ring main unit provided by the present invention has the following beneficial effects compared with the prior art:

[0020] (1) The present invention arranges a busbar, a vacuum circuit breaker unit and a disconnector in the box of the air compartment, and drives the vacuum circuit breaker unit to change position through the circuit breaker shifting mechanism, selectively contacts with various connecting parts of the disconnector, and realizes smooth switching of the closed, separated or grounded state, and the switching process is smooth;

[0021] (2) The connecting parts of the disconnector are arranged at intervals and in a linear manner, and are adapted to the running trajectory of the vacuum circuit breaker unit, so that smooth switching with surface contact can be performed;

[0022] (3) The greenhouse gas sulfur hexafluoride is not used in the box and the air compartment, but ordinary dry air is used, which has no risk of leakage;

[0023] (4) The static contact of the vacuum circuit breaker unit and each connecting part, as well as the moving contact and the busbar are in surface contact, with a large contact area, which is conducive to rapid arc extinguishing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a partial half-section front view of a normal pressure sealed air insulated ring main unit of the present invention;

[0026] Figure 2 It is a left view of a normal pressure sealed air insulated ring main unit of the present invention;

[0027] Figure 3 It is a schematic diagram of a switched working state of a vacuum circuit breaker unit of a normal pressure sealed air insulated ring main unit of the present invention. DETAILED DESCRIPTION

[0028] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] like Figure 1 Combination Figure 2 and Figure 3 As shown, the technical solution of the present invention is implemented as follows: The present invention provides a normal pressure sealed air insulated ring network cabinet, comprising:

[0030] Cabinet 1, which is hollow inside, provides a foundation for the installation of other equipment and provides a certain degree of protection;

[0031] The first partition 4 and the second partition 5 partition the internal space of the cabinet 1 to facilitate the installation and fixing of other equipment;

[0032] The vacuum circuit breaker unit 2 can be switched in different working states and has a vacuum tube part that can extinguish arcs;

[0033] The isolating switch 3 is selectively connected to the vacuum circuit breaker unit 2 to conduct the secondary circuit;

[0034] The box body 6 is arranged in the cabinet body 1 between the first partition plate 4 and the second partition plate 5, and serves as an installation base for the vacuum circuit breaker unit, the disconnector 3 and the circuit breaker shifting mechanism 7;

[0035] and the circuit breaker shifting mechanism 7, driving the vacuum circuit breaker unit 2 to move relative to the box 6, so as to realize the switching of different functions;

[0036] The first partition 4 and the second partition 5 are arranged at intervals in the cabinet 1, and the first partition 4 and the cabinet 1 together form a closed busbar chamber 10; the first partition 4, the second partition 5 and the cabinet 1 together form a closed air compartment 11; the second partition 5 and the cabinet 1 together form a closed cable chamber 12; the first partition 4 and the second partition 5 divide the internal space of the cabinet 1 into independent partitions according to functions, which is convenient for expansion, troubleshooting, inspection and maintenance;

[0037] A box body 6 is arranged in the air compartment 11, and the inside of the box body 6 is hollow. The vacuum circuit breaker unit 2 and the disconnector 3 are arranged in the box body 6; a busbar 8 is arranged at one end of the first partition 4 close to the busbar chamber 10, and the busbar 8 passes through the first partition 4 and the box body 6 in sequence and extends into the box body 6; a branch busbar 9 is arranged at one end of the second partition 5 close to the cable chamber 12, and the branch busbar 9 passes through the second partition 5 and the box body 6 in sequence and extends into the box body 6 and is electrically connected to the disconnector 3;

[0038] The isolating switch 3 includes a plurality of connecting parts, each of which is linearly arranged and spaced apart, one end of each connecting part is fixedly connected to one end of the box body 6 close to the second partition 5, and the other end of the connecting part extends toward the first partition 4; the vacuum circuit breaker unit 2 and the isolating switch 3 can cooperate to form a power supply transmission channel, grounding or detection and other functions;

[0039] The circuit breaker shifting mechanism 7 is arranged at one end of the box body 6 close to the first partition 4 or one end close to the second partition 5, and the circuit breaker shifting mechanism 7 is linearly arranged along the extended line direction of the arrangement of the connection parts of the disconnector 3 and penetrates the box body 6. The circuit breaker shifting mechanism 7 is sealed and connected to the box body 6. The circuit breaker shifting mechanism 7 is also connected to the vacuum circuit breaker unit 2; the vacuum circuit breaker unit 2 includes a static contact 21 and a moving contact 22, and the static contact 21 and the moving contact 22 are respectively arranged at two ends of the vacuum circuit breaker unit 2 close to the first partition 4 and the second partition 5; the circuit breaker shifting mechanism 7 drives the moving contact 22 of the vacuum circuit breaker unit 2 to selectively slide and connect with the busbar 8 extending into the box body 6, and at the same time, the circuit breaker shifting mechanism 7 drives the static contact 21 of the vacuum circuit breaker unit 2 to selectively electrically connect with the connection parts of the disconnector 3 in the box body 6. The circuit breaker shifting mechanism 7 can drive the vacuum circuit breaker unit 2 to reciprocate in the box body, and selectively contact with the connection parts of the disconnector 3 to form different functional combinations.

[0040] by Figure 2 The circuit breaker shifting mechanism 7 is explained by taking an example. The circuit breaker shifting mechanism 7 shown in the figure is installed at one end of the box body 6 close to the first partition 4. Of course, it can also be set at one end close to the second partition 5. The circuit breaker shifting mechanism 7 includes a linear motion mechanism 71, a slide groove 72, at least two rocker arms 73, a limit rod 74 and a connecting plate 75. The slide groove 72 is fixedly set on the inner surface of the box body 6. The slide groove is a U-shaped structure. The linear motion mechanism 71 passes through the box body 6 and is sealed to the box body 6. The movable end of the linear motion mechanism 71 is embedded in the slide groove 72. The movable end of the linear motion mechanism 71 can reciprocate linearly relative to the box body 6. Restricted by the slide groove 72, the limit position of the movement of the movable end of the linear motion mechanism 71 is the inner surface of the two ends inside the box body 6. A swing rod 73 is provided on the movable end of the linear motion mechanism 71, one end of the swing rod 73 is hingedly connected to the movable end of the linear motion mechanism 71, and the other end of the swing rod 73 is hingedly connected to the connecting plate 75, and the connecting plate 75 is fixedly connected to the vacuum circuit breaker unit 2; a limit rod 74 is provided between the swing rod 73 and the cabinet 1, one end of the limit rod 74 is hingedly connected to the inner surface of the cabinet 1, and the other end of the limit rod 74 is hingedly connected to one end of the swing rod 73 close to the connecting plate 75; the reciprocating linear motion of the movable end of the linear motion mechanism 71 drives the vacuum circuit breaker unit 2 to swing relative to the box 6. The linear motion mechanism 71 drives the vacuum circuit breaker unit 2 to move, and the busbar 8 does not need to move. The limit rod 74 can limit the swing amplitude of the vacuum circuit breaker unit 2.

[0041] The reciprocating linear motion of the movable end of the linear motion mechanism 71 drives the vacuum circuit breaker unit 2 to swing relative to the box body 6 in an arc-shaped trajectory. The disconnector 3 includes a connection part A, a connection part B and a connection part C. The ends of the connection parts A, B and C away from the second partition plate 5 are all located on the arc-shaped swing trajectory.

[0042] When the vacuum circuit breaker unit 2 swings to an end position of the arc relative to the cabinet 1, at this extreme position, the static contact 21 of the vacuum circuit breaker unit 2 contacts the end of the connection part A away from the second partition 5, and the moving contact 22 of the vacuum circuit breaker unit 2 is slidably connected to the busbar extending into the air compartment 11; when the vacuum circuit breaker unit 2 swings to an end position of the arc relative to the cabinet 1, at this extreme position, the static contact 21 of the vacuum circuit breaker unit 2 contacts the end of the connection part C away from the second partition 5, and the moving contact 22 of the vacuum circuit breaker unit 2 floats; when the vacuum circuit breaker unit 2 swings to the lowest point position of the arc relative to the cabinet 1, at this position the static contact 21 of the vacuum circuit breaker unit 2 contacts the end of the connection part B away from the second partition 5, and the moving contact 22 of the vacuum circuit breaker unit 2 is slidably connected to the busbar extending into the air compartment 11.

[0043] When the stationary contact 21 of the vacuum circuit breaker unit 2 is in contact with the connection part A and the moving contact 22 is slidably connected to the busbar 8, the vacuum circuit breaker unit 2 is in a closed working state; when the stationary contact 21 of the vacuum circuit breaker unit 2 is in contact with the connection part B and the moving contact 22 is slidably connected to the busbar 8, the vacuum circuit breaker unit 2 is in a grounded state; when the stationary contact 21 of the vacuum circuit breaker unit 2 is in contact with the connection part C, the vacuum circuit breaker unit 2 is in a separated working state.

[0044] In order to improve the contact effect of the vacuum circuit breaker unit 2 and increase the contact area, the static contact 21 and the moving contact 22 of the vacuum circuit breaker unit 2 and the ends of the connecting parts A, B and C away from the second partition 5 are all plate-shaped. The longitudinal section of the busbar 8 extending into the box 6 is L-shaped, and the surface of the busbar 8 matches the shape of the moving contact 22 of the vacuum circuit breaker unit 2.

[0045] In the present invention, the linear motion mechanism 71 can be a screw guide mechanism or an electric push rod mechanism. Of course, it can also be other linear reciprocating motion devices with position locking functions, such as linear cylinders, etc., which will not be described in detail here.

[0046] The circuit breaker shifting mechanism 7 is made of insulating material. The air compartment 11 and the box 6 are filled with dry air at normal pressure. The box 6 prevents direct connection between the busbar 6, the vacuum circuit breaker unit 2 and the disconnector 3. Only at specific positions can they be contacted in pairs. The contact and arc extinguishing process is completed in the closed box 6, and the function switching can be realized quickly and reliably, without being affected by the external environment, without using greenhouse gases, and without environmental pollution factors.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A normal pressure sealed air insulated ring main unit, characterized in that: The invention comprises a cabinet (1), a vacuum circuit breaker unit (2), an isolating switch (3), a first partition (4), a second partition (5), a box (6) and a circuit breaker shifting mechanism (7); the cabinet (1) is hollow inside; a first partition (4) and a second partition (5) are arranged in a spaced relationship inside the cabinet (1); the first partition (4) and the cabinet (1) together form a closed busbar chamber (10); the first partition (4), the second partition (5) and the cabinet (1) together form a closed air compartment (11); the second partition (5) and the cabinet (1) together form a closed cable chamber (12); wherein: A box body (6) is arranged in the air compartment (11), the box body (6) is hollow inside, and the vacuum circuit breaker unit (2) and the disconnector (3) are both arranged in the box body (6); a busbar (8) is arranged at one end of the first partition (4) close to the busbar chamber (10), and the busbar (8) passes through the first partition (4) and the box body (6) in sequence and extends into the box body (6); a branch busbar (9) is arranged at one end of the second partition (5) close to the cable chamber (12), and the branch busbar (9) passes through the second partition (5) and the box body (6) in sequence and extends into the box body (6) and is electrically connected to the disconnector (3); The isolating switch (3) comprises a plurality of connecting parts, each of which is linearly arranged and spaced apart, one end of each connecting part being fixedly connected to one end of the box body (6) close to the second partition (5), and the other end of the connecting part extending in the direction of the first partition (4); The circuit breaker shifting mechanism (7) is arranged at one end of the box (6) close to the first partition (4) or one end close to the second partition (5), and the circuit breaker shifting mechanism (7) is linearly arranged along the extension line direction of the arrangement of the connecting parts of the disconnector (3) and penetrates the box (6), the circuit breaker shifting mechanism (7) is sealedly connected to the box (6), and the circuit breaker shifting mechanism (7) is also connected to the vacuum circuit breaker unit (2); The vacuum circuit breaker unit (2) comprises a stationary contact (21) and a moving contact (22), the stationary contact (21) and the moving contact (22) being respectively arranged at two ends of the vacuum circuit breaker unit (2) close to the first partition (4) and the second partition (5); the circuit breaker shifting mechanism (7) drives the moving contact (22) of the vacuum circuit breaker unit (2) to selectively slide and connect with the busbar (8) extending into the box (6), and at the same time, the circuit breaker shifting mechanism (7) drives the stationary contact (21) of the vacuum circuit breaker unit (2) to selectively electrically connect with various connecting parts of the disconnector (3) in the box (6); The circuit breaker displacement mechanism (7) comprises a linear motion mechanism (71), a slide groove (72), at least two swing rods (73), a limit rod (74) and a connecting plate (75); the slide groove (72) is fixedly arranged on the inner surface of the box (6); the linear motion mechanism (71) penetrates the box (6) and is sealedly connected to the box (6); the movable end of the linear motion mechanism (71) is embedded in the slide groove (72); the movable end of the linear motion mechanism (71) can reciprocate linearly relative to the box (6); a swing rod (73) is arranged on the movable end of the linear motion mechanism (71); the swing rod (73) is fixedly arranged on the inner surface of the box (6); the linear motion mechanism (71) penetrates the box (6) and is sealedly connected to the box (6); the movable end of the linear motion mechanism (71) is embedded in the slide groove (72); the movable end of the linear motion mechanism (71) can reciprocate linearly relative to the box (6); One end of the swing rod (73) is hingedly connected to the movable end of the linear motion mechanism (71), the other end of the swing rod (73) is hingedly connected to the connecting plate (75), and the connecting plate (75) is fixedly connected to the vacuum circuit breaker unit (2); a limit rod (74) is provided between the swing rod (73) and the cabinet (1), one end of the limit rod (74) is hingedly connected to the inner surface of the cabinet (1), and the other end of the limit rod (74) is hingedly connected to one end of the swing rod (73) close to the connecting plate (75); the reciprocating linear motion of the movable end of the linear motion mechanism (71) drives the vacuum circuit breaker unit to swing relative to the cabinet (6); The circuit breaker displacement mechanism (7) is made of insulating material; the air compartment (11) and the box body (6) are filled with dry air at normal pressure.

2. The atmospheric pressure sealed air insulated ring main unit according to claim 1, characterized in that: The reciprocating linear motion of the movable end of the linear motion mechanism (71) drives the vacuum circuit breaker unit (2) to swing relative to the box (6) in an arc-shaped trajectory, and the disconnector (3) comprises a connection part A, a connection part B and a connection part C, and the ends of the connection parts A, B and C away from the second partition plate (5) are all located on the arc-shaped swing trajectory; When the vacuum circuit breaker unit (2) swings relative to the cabinet (1) to an end position of the arc, the stationary contact (21) of the vacuum circuit breaker unit (2) contacts one end of the connection part A away from the second partition (5), and the moving contact (22) of the vacuum circuit breaker unit (2) is slidably connected to the busbar extending into the air compartment (11); when the vacuum circuit breaker unit (2) swings relative to the cabinet (1) to an end position of the arc, the stationary contact (21) of the vacuum circuit breaker unit (2) contacts one end of the connection part C away from the second partition (5), and the moving contact (22) of the vacuum circuit breaker unit (2) floats; when the vacuum circuit breaker unit (2) swings relative to the cabinet (1) to the lowest point position of the arc, the stationary contact (21) of the vacuum circuit breaker unit (2) contacts one end of the connection part B away from the second partition (5), and the moving contact (22) of the vacuum circuit breaker unit (2) is slidably connected to the busbar extending into the air compartment (11).

3. The atmospheric pressure sealed air insulated ring main unit according to claim 2, characterized in that: When the stationary contact (21) of the vacuum circuit breaker unit (2) is in contact with the connection part A, and the moving contact (22) is slidably connected to the busbar, the vacuum circuit breaker unit (2) is in a closed working state; when the stationary contact (21) of the vacuum circuit breaker unit (2) is in contact with the connection part B, and the moving contact (22) is slidably connected to the busbar, the vacuum circuit breaker unit (2) is in a grounded state; when the stationary contact (21) of the vacuum circuit breaker unit (2) is in contact with the connection part C, the vacuum circuit breaker unit (2) is in a separated working state.

4. The atmospheric pressure sealed air insulated ring main unit according to claim 3, characterized in that: The static contact (21), the moving contact (22) and the ends of the connection parts A, B and C of the vacuum circuit breaker unit (2) away from the second partition plate (5) are all plate-shaped.

5. The atmospheric pressure sealed air insulated ring main unit according to claim 2, characterized in that: The longitudinal cross-section of the busbar (8) extending into the box body (6) is L-shaped, and the surface of the busbar (8) extending into the box body (6) matches the shape of the moving contact (22) of the vacuum circuit breaker unit (2).

6. The atmospheric pressure sealed air insulated ring main unit according to claim 1, characterized in that: The linear motion mechanism (71) is a screw guide mechanism or an electric push rod mechanism.

Images