CN103681098A - Circuit breaker with isolation stations and switchgear utilizing circuit breaker - Google Patents

Abstract

The invention discloses a circuit breaker with an isolation station and a switch cabinet using the circuit breaker. The circuit breaker with an isolation station includes an arc extinguishing chamber, the arc extinguishing chamber has two electrodes, and the arc extinguishing chamber is guided along a straight line The mobile assembly is equipped with two isolated moving contacts, and each isolated moving contact has a connecting station and an isolating station on the linear movement stroke. The two isolated moving contacts are respectively connected to the two electrodes of the arc extinguishing chamber. The isolating movable contacts are respectively provided with contact parts for contacting and conducting with the corresponding isolating static contacts at the connecting station. The circuit breaker with isolation station of the present invention has an isolation movable contact that can be moved and connected to the corresponding isolation static contact, so that the isolation station is increased, and when used in a switch cabinet, it can ensure that it is completely connected to the main circuit during maintenance. Disconnect without any safety hazard.

Description

A circuit breaker with an isolation station and a switchgear using the circuit breaker

technical field

The invention relates to a power transmission and distribution switch cabinet and a circuit breaker thereof.

Background technique

At present, switch cabinets at home and abroad are divided into fixed type and removable type according to whether the circuit breaker can be removed. The fixed type cabinet has the problem of extremely inconvenient maintenance and repair because it is difficult to disassemble; the removable type cabinet structure in the prior art Such as CN 203260933 U discloses a kind of switchgear, the wall plate that its cabinet body is made of steel plate divides and forms a plurality of compartments, generally includes the bus bar chamber of the top, the circuit breaker chamber of the middle part, the cable chamber of the bottom, the circuit breaker The handcart circuit breaker is installed in the room, and the handcart circuit breaker includes a handcart that moves forward and backward and is assembled on the guide rail in the horizontal direction and a circuit breaker fixed on the handcart. The circuit breaker includes an upright arc extinguishing chamber and a The two poles of the arc extinguishing chamber are respectively electrically conductive circuit breaker contacts. The horizontally extending circuit breaker contacts are arranged on the arc extinguishing chamber and distributed side by side along the upper and lower sides. The circuit breaker contacts can move back and forth with the handcart. When entering the circuit breaker room and moving to the working position, the two circuit breaker contacts can respectively be plugged with the static contacts in the contact boxes set on the wall panels of the bus room and the cable room to conduct electricity, and the two The static contacts are respectively connected with the primary busbar and the primary cable. Therefore, the breaking of the primary main circuit between the handcart type circuit breaker and the switch cabinet in the prior art is carried out with the movement of the handcart. Although the removable cabinet is convenient for maintenance and overhaul, the safety factor is low, especially for large current circuits. In the switch cabinet, there are hidden dangers of safety accidents and personal casualties when the handcart is shaken.

In addition, at present, most of the conductors in the circuit breaker are copper bars, but because there are both vertically arranged arc extinguishing chambers and horizontal circuit breaker contacts, the conductive circuit routing of the circuit breaker is irregular, and a lot of copper materials are consumed. And cause the lateral thickness dimension of the cabinet to be larger.

Contents of the invention

The object of the present invention is to provide a circuit breaker with an isolation station which improves safety. At the same time provide the switchgear using the circuit breaker.

The technical scheme of a circuit breaker with isolation station of the present invention is: a circuit breaker with isolation station, including an arc extinguishing chamber, the arc extinguishing chamber has two electrodes, and the arc extinguishing chamber is equipped with two electrodes for moving along a straight line. Each isolated movable contact has a connecting station and an isolated station on the linear movement stroke of each isolated movable contact. The two isolated movable contacts are respectively connected to the two electrodes of the arc extinguishing chamber. Each isolated movable contact There are also contact parts for contacting and conducting with the corresponding isolated static contacts at the connecting station.

The arc extinguishing chamber is erected and has an upper electrode and a lower electrode. The two isolated movable contacts are respectively guided and moved along the up and down directions and assembled on the top and bottom of the arc extinguishing chamber. The isolated movable contact, the upper isolated movable contact and the lower isolated movable contact are respectively connected to the upper electrode and the lower electrode of the arc extinguishing chamber; the upper isolated movable contact moves along the up and down direction and has The upper connecting station and the lower isolating station, the lower isolating movable contact moves in the up and down direction and has a lower connecting station and an upper isolating station on its up and down movement stroke.

The top of the upper isolating movable contact is above the top of the arc extinguishing chamber at the connecting station, and the bottom of the upper isolating movable contact is below the top of the arc extinguishing chamber at the isolating station.

The bottom of the lower isolating movable contact is below the bottom of the arc extinguishing chamber at the connecting station, and the top of the lower isolating movable contact is above the bottom of the arc extinguishing chamber at the isolating station.

The top and bottom of the arc extinguishing chamber are respectively fixed with an upper outlet seat connected to the upper electrode and a lower outlet seat connected with the lower electrode. The outlet seat conducts conductive contact, and the lower isolation movable contact guides up and down to move and is assembled in the lower outlet seat and is in conductive contact with the lower outlet seat.

The circuit breaker includes a fixed seat or a handcart. The arc extinguishing chamber has three phases and is arranged side by side along the front and rear directions and fixed on the fixed seat or handcart. The upper and lower isolated movable contacts are arranged in parallel on the left and right of the arc extinguishing chamber On both sides, on the bottom of the fixed seat or the handcart, there are holes for the isolated moving contact to pass downward.

The technical scheme of the switchgear of the present invention is: a switchgear, including a cabinet body, a circuit breaker room, a busbar room, and a cable room are arranged in the cabinet body, a circuit breaker is installed in the circuit breaker room, and the circuit breaker includes an arc extinguishing chamber, Each arc extinguishing chamber has two electrodes, and each arc extinguishing chamber is equipped with two isolation moving contacts along a linear guide. The linear movement of each isolation moving contact has a connection station and an isolation station. The moving contacts are respectively connected to the two electrodes of the arc extinguishing chamber, and the switchgear is also equipped with an upper isolated static contact for conducting with the busbar of the busbar room, and a lower isolating contact for conducting with the primary cable of the cable room. For the static contact, the two isolating movable contacts are respectively provided with contact parts for making contact with the upper and lower isolating static contacts at the connecting station.

The arc extinguishing chamber is erected and has an upper electrode and a lower electrode. The two isolated movable contacts are respectively guided and moved along the up and down directions and assembled on the top and bottom of the arc extinguishing chamber. The isolated movable contact, the upper isolated movable contact and the lower isolated movable contact are respectively connected to the upper electrode and the lower electrode of the arc extinguishing chamber; the upper isolated movable contact moves along the up and down direction and has The upper connecting station and the lower isolating station, the lower isolating movable contact moves in the up and down direction and has a lower connecting station and an upper isolating station on its up and down movement stroke; The upper and lower isolated static contacts are correspondingly arranged above and below the circuit breaker chamber in the switch cabinet.

The circuit breaker includes a fixed seat or a handcart that moves forward and backward and is assembled in the circuit breaker room. The arc extinguishing chamber has three phases and is arranged side by side along the front and rear direction and fixed on the fixed seat or the handcart. The upper and lower isolation movable contacts are arranged side by side. Distributed on the left and right sides of the arc extinguishing chamber, the bottom of the fixed seat or handcart is provided with a hole for the isolated moving contact to pass downward.

The circuit breaker with isolation station of the present invention has an isolation movable contact that can be moved and connected to the corresponding isolation static contact, so that the isolation station is added, and when used in a switch cabinet, it can ensure that it is completely connected to the main circuit during maintenance. Disconnect without any safety hazard.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of a circuit breaker of the present invention;

Fig. 2 is a view from another angle of view of the circuit breaker in Fig. 1;

Fig. 3 is a schematic diagram of the isolated movable contact of the circuit breaker of the present invention in the isolated station;

Fig. 4 is a schematic diagram of the isolated movable contact of the circuit breaker of the present invention in the on position;

Fig. 5 is a schematic structural view of an embodiment of the switchgear of the present invention.

Detailed ways

As shown in Figures 1 to 4, the embodiment of the circuit breaker of the present invention is a handcart type circuit breaker, including a handcart 27, and three arc extinguishing chambers that are vertically fixed on the handcart 27 and arranged side by side. 23. The arc extinguishing chamber 23 has two upper and lower electrodes that are driven by the corresponding mechanism, and the structure of the arc extinguishing chamber belongs to conventional technology and will not be repeated here. The top and bottom of each arc extinguishing chamber 23 are respectively guided and moved along a straight line and equipped with a pair of upper isolated movable contacts 21 and lower isolated movable contacts 24, and the upper isolated movable contacts 21 and the lower isolated movable contacts 24 are connected with the arc extinguishing chamber respectively. The upper electrode and the lower electrode of 23 are electrically connected. the

The upper part of the arc extinguishing chamber 23 is fixed with the upper outlet seat 22 which is connected to the upper electrode. It moves up and down and has an upper connection station and a lower isolation station on its up and down movement stroke. The top of the upper isolation movable contact 21 has a contact part, and the connection station is above the top of the arc extinguishing chamber 23. It is plugged and connected with the corresponding isolated static contact of the busbar room above the circuit breaker in the switch cabinet, and the bottom of the upper isolated movable contact 21 is located under the top of the arc extinguishing chamber 23 at the isolated station, so that the upper isolated movable contact 21 is connected to the extinguisher The arc chambers 23 can share part of the height space of the switchgear in a parallel arrangement.

The lower part of the arc extinguishing chamber 23 is fixed with the lower outlet seat 25 which is connected to the lower electrode. The lower isolated movable contact 24 is guided and moved up and down and assembled in the lower outlet seat 25 and is in conductive contact with the lower outlet seat 25. The lower isolated movable contact 24 moves along the It moves up and down and has a lower connection station and an upper isolation station on its up and down movement stroke. The bottom of the lower isolation movable contact 24 has a contact part at the bottom of the arc extinguishing chamber 23 at the connection station. It is plugged and connected with the corresponding isolated static contact in the cable room below the circuit breaker in the switch cabinet, and the top of the lower isolated movable contact 24 is above the bottom of the arc extinguishing chamber 23 at the isolated station, so that the lower isolated movable contact 24 is in contact with the extinguisher. The arc chambers 23 can share part of the height space of the switchgear in a parallel arrangement. The upper and lower wire outlet seats 22 and 25 are circular tubes equipped with spring contacts for conductive contact with the corresponding isolated moving contacts. The pouring method fixes the connection.

The upper and lower isolation moving contacts are driven by the corresponding mechanism to move up and down, and are always in contact with the upper and lower outlet seats during the whole movement process. The operation of driving the dynamic and static contacts in the arc extinguishing chamber to break (the circuit breaker has breakable contacts in the arc extinguishing chamber, which belongs to the prior art, and its structure will not be described in detail) and the direct action of the upper and lower isolating moving contacts The moving mechanism is arranged in the mechanism box 26. Fig. 3 and Fig. 4 are schematic diagrams when the circuit breaker is in the isolated state and the connected state respectively. The upper isolating movable contact 21 and the lower isolating movable contact 24 are respectively driven by respective operating mechanisms, and the driving mode is vertical direct motion. After connecting, the arrangement of the conductors is approximately linear, as shown in FIG. 5 .

The upper outlet seat 22, the arc extinguishing chamber part 23 and the lower outlet seat 25 are all solidly sealed as a whole. The solid-sealed whole and the mechanism box 26 are fixed on the handcart 27. The handcart 27 is different from the existing chassis car. Due to the longitudinal arrangement of the conductors, the conductors for isolating the moving contacts up and down will pass through the handcart during work. Hole frame structure.

As shown in Figures 1 to 5, the embodiment of the switchgear of the circuit breaker using the above-mentioned circuit breaker embodiment of the present invention includes a cabinet body 1, a circuit breaker chamber 2 and a circuit breaker chamber 2 respectively located above and below the circuit breaker chamber. Bus room 3, cable room 4.

Wherein the circuit breaker room 2 is equipped with the circuit breaker as shown in Figure 1-Figure 4 and the embodiment of the above circuit breaker, the circuit breaker is moved along the front and back direction of the cabinet body and assembled on the track at the bottom of the circuit breaker room 2, and the vertical Three arc extinguishing chambers 23 are arranged side by side along the front and rear directions of the cabinet body, and the upper and lower outlet seats 22 and 25 on each arc extinguishing chamber 23 are distributed on both sides of the arc extinguishing chamber 23 in the left and right directions of the cabinet body, and the two outlet seats move The upper and lower isolation movable contacts are also relatively distributed on the left and right sides of the arc extinguishing chamber. The front side panel of the cabinet body 1 is provided with an observation window 14 for observing the state of the isolated movable contact.

The busbar room 3 is equipped with three-phase main busbars arranged side by side along the front and rear directions of the cabinet body in the busbar room and upper isolated static contacts 32 conducting with each busbar. Each main busbar extends horizontally along the left and right directions. Each main busbar is a "double D-type busbar, bolt holes are opened on the main busbar, the upper part of the upper isolating static contact 32 is a rectangular section, clamped by two D-type busbars and fixed by bolts, the lower part of the upper isolating static contact 32 is open downward Round tube shape, the axis of the round tube is in the vertical direction, and spring contacts are installed inside. The lower isolated static contact 41 which is connected with the primary cable of the cable room is installed in the cable chamber 4, the lower end of the lower isolated static contact 41 is arranged coaxially with the corresponding lower isolated movable contact 24, and the upper and lower isolated static contacts All are round.

Each main circuit in this switchgear embodiment is mainly composed of the main busbar, the upper isolated static contact 32, the upper isolated movable contact 21, the upper outlet seat 22, the arc extinguishing chamber 23, the lower outlet seat 25, and the lower isolated movable contact 24 , The lower isolating static contact 41 and a primary cable are formed. The three-phase main circuit is arranged side by side horizontally along the front and rear direction of the cabinet (that is, the depth direction of the larger cabinet size), and is arranged side by side with the common three-phase main circuit along the left and right direction of the cabinet (that is, the width direction of the smaller cabinet size) Compared with this scheme, the width of the cabinet can be reduced.

The working process of the embodiment of the above switch cabinet is as follows. When the circuit breaker is in the on state, the upper and lower ends of the upper isolation movable contact 21 are respectively in contact with the upper isolation static contact 32 and the spring contacts in the upper outlet seat 22, and the lower isolation movable contact The upper and lower ends of the contact 24 are respectively in contact with the spring contacts in the lower isolating static contact 41 and the lower outlet seat 25, at this moment, the breaking of the main circuit can be controlled by breaking the circuit breaker. When the circuit breaker is from the connected state to the isolated state, the upper isolated movable contact 21 moves downward, and the lower isolated movable contact 24 moves upward, and separates from the upper and lower isolated static contacts 32, 41 respectively to form an isolated fracture. When in the isolation position, the ends of the upper and lower isolation moving contacts close to the isolation fracture are still in contact with the spring contacts in the upper and lower outlet sockets, and the ends far away from the isolation fracture are suspended in the air and arranged in parallel with the arc extinguishing chamber 23, thus occupying the arc extinguishing space. The space on the left and right sides of the chamber 23 makes full use of the vacant position, thereby reducing the size of the cabinet.

In other embodiments of the present invention, the main bus bar of the switchgear can also use other shape bus bars, such as rectangular, grooved or round bus bars; the circuit breaker can also be fixed; all the conductive parts on the main circuit can also use other shapes Especially when the current of the switchgear is small, the upper and lower isolating moving contacts are more suitable to be circular; the upper and lower outlet seats and the arc extinguishing chamber can also be fixed without bolts or pouring, such as welding; , The lower isolation moving contact and the upper and lower isolation static contacts can also be connected without spring contacts, such as bolt connection, watch strap contact fingers, blade contact and other connection methods; the same insulation method of the cabinet can also use gas Insulation; the isolating switch composed of the circuit breaker and the upper and lower isolating static contacts can be a two-position isolating switch, or the upper and lower isolation methods can be simply modified to become a three-position isolating and grounding switch to apply to different forms switchgear, and the circuit breaker can also be fixed in the circuit breaker room. At this time, replace the handcart with a fixed seat and fix the arc extinguishing chamber and other components on the fixed seat. The isolated moving contact of the circuit breaker The head can also be changed to a horizontally movable type according to actual needs, so that it can directly cooperate with the horizontally extending isolation static contact in the prior art to realize connection and isolation. In addition, the switch cabinet using a circuit breaker can realize both fixed and Can be removed. Under normal circumstances, the circuit breaker does not need to be removed, and functions such as connection and isolation of the circuit can be realized through the action of the circuit breaker and the isolation contact; when the circuit breaker is inspected or maintained, it does not need to be disassembled, and the circuit breaker can be removed by the frame handcart. Make overhaul or maintenance more convenient. the

Claims (9)

1. A circuit breaker with an isolation station, including an arc extinguishing chamber, the arc extinguishing chamber has two electrodes, and is characterized in that: the arc extinguishing chamber is guided along a straight line and is equipped with two isolated movable contacts, each isolated movable contact The linear movement stroke of the head has a connection station and an isolation station. The two isolation movable contacts are respectively connected to the two electrodes of the arc extinguishing chamber. The contact part that is in contact with the corresponding isolated static contact. 2. The circuit breaker according to claim 1, characterized in that: the arc extinguishing chamber is erected and has an upper electrode and a lower electrode; The upper isolated movable contact and the lower isolated movable contact on the top of the arc chamber and the bottom of the arc extinguishing chamber, the upper isolated movable contact and the lower isolated movable contact are respectively connected to the upper electrode and the lower electrode of the arc extinguish chamber; the upper isolated The movable contact moves in the up and down direction and has an upper connection station and a lower isolation station on its up and down movement stroke. The lower connection station and the upper isolation station. 3. The circuit breaker according to claim 2, characterized in that: the top of the upper isolating movable contact is above the top of the arc extinguishing chamber at the connecting station, and the bottom of the upper isolating movable contact is in the arc extinguishing chamber at the isolating station below the top. 4. The circuit breaker according to claim 2, characterized in that: the bottom of the lower isolating movable contact is below the bottom of the arc extinguishing chamber at the connecting station, and the top of the lower isolating movable contact is in the arc extinguishing chamber at the isolating station above the bottom. 5. The circuit breaker according to claim 2, characterized in that: the top and the bottom of the arc extinguishing chamber are respectively fixed with an upper outlet seat connected to the upper electrode and a lower outlet seat connected to the lower electrode, and the upper The isolation movable contact moves up and down and is assembled in the upper outlet seat and is in conductive contact with the upper outlet seat, and the lower isolation movable contact is guided and moved up and down in the lower outlet seat and is in conductive contact with the lower outlet seat. 6. The circuit breaker according to claim 2, characterized in that: the circuit breaker includes a fixed base or a handcart, the arc extinguishing chamber has three phases and is fixed on the fixed base or the handcart in parallel distribution along the front and rear directions, the The upper and lower isolated movable contacts are distributed side by side on the left and right sides of the arc extinguishing chamber, and the bottom of the fixing seat or handcart is provided with a hole for the isolated movable contacts to pass downward. 7. A switchgear, comprising a cabinet body, a circuit breaker room, a bus bar room, and a cable room are arranged in the cabinet body, a circuit breaker is installed in the circuit breaker room, and the circuit breaker includes an arc extinguishing chamber, and each arc extinguishing chamber has two electrodes , which is characterized in that: each arc extinguishing chamber is equipped with two isolated movable contacts moving along a straight line, each isolated movable contact has a connection station and an isolated station on the linear movement stroke, and the two isolated movable contacts are respectively Corresponding to the two electrodes of the arc extinguishing chamber, the switch cabinet is also equipped with an upper isolated static contact for conducting with the busbar of the busbar room, and a lower isolating static contact for conducting with the primary cable of the cable room. The two isolating movable contacts are respectively provided with contact parts for contacting and conducting with the upper and lower isolating static contacts respectively at the connecting station. 8. The switchgear according to claim 7, characterized in that: the arc extinguishing chamber is erected and has an upper electrode and a lower electrode, and the two isolated movable contacts are respectively guided and moved in the vertical direction and assembled on the extinguisher. The upper isolated movable contact and the lower isolated movable contact on the top of the arc chamber and the bottom of the arc extinguishing chamber, the upper isolated movable contact and the lower isolated movable contact are respectively connected to the upper electrode and the lower electrode of the arc extinguish chamber; the upper isolated The movable contact moves in the up and down direction and has an upper connection station and a lower isolation station on its up and down movement stroke. The lower connecting station and the upper isolating station; the upper and lower isolating static contacts are correspondingly arranged above and below the circuit breaker chamber in the switch cabinet. 9. The switchgear according to claim 7 or 8, characterized in that: the circuit breaker includes a fixed seat or a handcart that moves forward and backward and is assembled in the circuit breaker room, and the arc extinguishing chamber has three phases and is arranged and fixed in parallel along the front and rear directions On the fixed seat or handcart, the upper and lower isolated movable contacts are distributed side by side on the left and right sides of the arc extinguishing chamber, and the fixed seat or the bottom of the handcart is provided with a hole for the isolated movable contacts to pass downward.

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