CN210200333U

CN210200333U - Branch bus and ring main unit comprising same

Info

Publication number: CN210200333U
Application number: CN201920617122.3U
Authority: CN
Inventors: Guigao Chen; 陈桂高
Original assignee: Schneider Electric Industries SAS
Current assignee: Schneider Electric Industries SAS
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2020-03-27
Anticipated expiration: 2029-04-30

Abstract

The utility model discloses a branch generating line reaches looped netowrk cabinet including it. The branch bus is used for connecting the main bus and the flexible connection of the vacuum circuit breaker, and comprises: the main body is a hollow cylindrical tube made of a conductive material and comprises a main bus connecting end and a flexible connecting flat cable connecting end, wherein the main bus connecting end is provided with two parallel plane parts which are separated by a certain distance and integrally formed with the main body, and the main bus connecting end is used for being connected with a surface of the main bus in close contact. According to the utility model discloses a branch generating line simple structure, material saving, reduce cost have the function of electricity connection, heat dissipation and even electric field, can realize main bus-bar to vacuum circuit breaker's reliable electricity with simple mode, less part and connect, realize that all electricity connection points are along the center axis symmetry of main bus-bar. The ring main unit using the ring main unit is also improved in performance.

Description

Branch bus and ring main unit comprising same

Technical Field

The utility model relates to a branch generating line, more specifically relate to the branch generating line that is used for being connected to the flexible coupling of vacuum circuit breaker with main generating line, the utility model discloses still relate to the looped netowrk cabinet that includes branch generating line.

Background

The branch bus is generally used for connecting the flexible connection and the main bus of the vacuum circuit breaker, the vacuum circuit breaker is generally compact in structure, small in insulation distance and poor in heat dissipation condition, and for interchangeability, the three-phase centers of the vacuum circuit breaker and the main bus or other switches are overlapped.

In order to realize the connection between the main bus and the flexible connection of the vacuum circuit breaker, the branch bus is usually connected by a rectangular copper bar. However, the rectangular copper bar has poor electric field distribution, and on the premise of compact design, in order to improve the insulating property of the vacuum circuit breaker, an additional part for improving the electric field must be introduced, and under the condition of the same sectional area, the heat dissipation performance of the rectangular copper bar is worse, and when the distance between the main bus fixing point and the flexible connection fixing point is very short (such as less than 60mm), the waste rate in the vertical bending process of the rectangular copper bar is high (more than 20%). In addition, because of the requirement of interchangeability, the three-phase centers of the vacuum circuit breaker and the main bus or other switches are overlapped, in order to be overlapped with the main bus, a section difference is required to be formed on the rectangular copper bar, so that the overlapping surface deviates from the original axis by a certain distance (the thickness of the main bus), and the processing cost is increased.

There is therefore a need for an improved branch bar and a ring main unit comprising such a branch bar that can solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving or at least alleviating the problems by providing the branch bus with simple structure, low cost and excellent performance.

According to an aspect of the present invention, there is provided a branch bus for connecting a main bus and a flexible connection cable of a vacuum circuit breaker, comprising:

the main body is a hollow cylindrical tube made of conductive material and comprises a main bus connecting end and a soft connecting end,

the main bus connecting end comprises two parallel plane parts which are separated from each other by a certain distance and are integrally formed with the main body, and the two parallel plane parts are used for being in surface connection with the main bus in tight contact.

Preferably, the two parallel flat portions are formed by cutting a groove to a depth along a cutting plane passing through a diameter of the longitudinal axis of the body and the end plane, and then flattening the two half-hollow cylindrical tubes cut apart along two planes parallel to the cutting plane and spaced apart by the distance, respectively.

Preferably, the two parallel flat portions of the main bus bar connecting end are respectively provided with a hole for connecting the main bus bar connecting end to the main bus bar by passing a screw through the hole and the main bus bar.

Preferably, the distance is substantially the same as the thickness of the main bar, and the two parallel planar portions are symmetrically arranged with respect to the cutting plane.

Preferably, the flexible connection end is an annular plane with an end surface perpendicular to the axis of the main body, and the branch bus is tightly connected with the flexible connection of the vacuum circuit breaker through the annular plane.

Preferably, the flexible connection end comprises opposite openings which are arranged on the wall of the hollow cylindrical pipe along the diameter, and a movable nut of which the end is clamped in the openings, and a through hole is arranged in the position of the flexible connection of the vacuum circuit breaker corresponding to the threaded hole of the movable nut, so that the flexible connection of the vacuum circuit breaker is connected with the flexible connection end of the branch bus by passing a screw through the through hole and screwing the screw into the threaded hole.

Preferably, the branch bus bar may be bent in a letter L shape in the cutting plane, the main bus bar connection end is located at a short side portion of the letter L, the flexible flat cable connection end is located at a long side portion of the letter L, and the short side portion and the long side portion are connected by a transition portion having a rounded corner.

Preferably, the long side portion of the letter L of the branch bus bar is adapted to be vertically mounted to a bracket fixed to the mounting plate.

Preferably, the outer diameter of the branch bus is larger than the width of the support, and is close to or slightly smaller than the width of the flexible connection, so that the electric field of the support and the flexible connection can be shielded by the branch bus.

According to another aspect of the utility model, a looped netowrk cabinet is provided, including vacuum circuit breaker, vacuum circuit breaker's flexible coupling is connected to the main bus through the branch generating line according to preceding.

According to the utility model discloses a branch generating line simple structure, material saving, reduce cost have the function of electricity connection, heat dissipation and even electric field, can realize the reliable electricity of main bus to the load circuit with simple mode, less part and connect, can realize that all electricity connection points and fixed point are located the axial bisector in or about the axial plane facet symmetry. According to the utility model discloses an use the looped netowrk cabinet of branch generating line also performance is improved consequently.

Drawings

FIG. 1 is a perspective view of a branch busbar shown in an orientation in use according to one embodiment of the present invention;

FIG. 2 is a perspective view of the branch bus bar shown in FIG. 1, shown from another perspective;

fig. 3 is a partial schematic view of a branch busbar in place according to the present invention.

Detailed Description

Embodiments according to the present invention will be described with reference to the accompanying drawings, wherein directional terminology used in the description is for the purpose of description only and is not intended to be limiting.

Fig. 1 is a perspective view of a branch busbar shown in an orientation in use according to one embodiment of the present invention; FIG. 2 is a perspective view of the branch bus bar shown in FIG. 1, shown from another perspective; fig. 3 is a partially exploded schematic view of a branch bus bar according to the present invention as installed in place.

Referring to fig. 1 and 2, a branch busbar according to the present invention is generally denoted by reference numeral 1, and the branch busbar 1 includes a generally L-shaped hollow cylindrical tube body, a long side portion denoted by L2, a short side portion denoted by L1, and a long side portion L2 and a short side portion L1 connected by a rounded transition 13 which is bent. The end of the short side portion L1 is a main bus bar connection terminal 11, and the end of the long side portion L2 is a soft connection terminal 12 of the vacuum circuit breaker.

The main bus bar connection end 11 includes a cut groove 113 extending in the axial direction to a certain depth toward the main body through the end surface diameter, and flat plane portions 111 located on both sides of the cut groove 113. Said flat planar portions 111 are obtained by cutting to a certain depth along a cutting plane passing through the longitudinal axis of the body and then flattening the two half-hollow cylindrical tubes cut apart, respectively, along a plane parallel to the cutting plane, thereby distancing the flat planar portions 111 at said distance. The two flat planar portions 111 are used to sandwich and connect the rectangular row of main bus bars so that the distance is approximately the thickness of the rectangular row of main bus bars. The cutting grooves 113 may have a certain width according to a machining method, for example, different types of milling cutters may be used. Each of the flat planar portions 111 is provided with a hole 112 for connection with the main bus bar by a screw through the hole 112. Since the flat plane parts 111 are connected with the main bus bar by a large surface contact, a large contact resistance between the contact surfaces is avoided, and the two parallel plane parts 111 are symmetrically arranged with respect to the plane passing through the longitudinal axis of the main body, whereby the branch bus bar 1 is connected with the main bus bar while maintaining the performance that the entire electrical connection point is symmetrical with respect to the central axis of the main bus bar (i.e., the central axis of each phase), thereby ensuring the interchangeability of the product arrangement.

The 1 main part of branch generating line is formed by the great hollow circular cylinder form metal pipe that has certain thickness of diameter, can adopt diameter 30mm thickness to be 3 mm's hollow circular cylinder form copper pipe for example, and its cylindrical shape self can play the effect of even electric field, consequently need not other even electric field part, and even electric field can improve the insulating properties under the same insulating distance, consequently according to the utility model discloses a branch generating line can be applicable to in the environment-friendly electrical equipment of compact design, for example in the looped netowrk cabinet. Further, compared with the branch bus bar having a rectangular cross-sectional shape or other cross-sectional shapes, the cylindrical tube having a circular cross-section has the best heat dissipation effect with respect to the branch bus bar having other cross-sectional shapes at the same cross-sectional area, so that the branch bus bar 1 can achieve both the uniform electric field and the heat dissipation function while achieving the connection of the main bus bar to the vacuum circuit breaker. Compared with the solid rectangular flat cable in the prior art, the hollow cylindrical tubular structure also has the advantages of saving materials and reducing cost.

Fig. 3 is a perspective view of a branch bus bar fixed in position according to the illustrated embodiment of the present invention, and as can be seen from fig. 3, the branch bus bar 1 is fastened in position by holding the long side portion L2 in a vertical direction, the short side portion L1 above L2, while the long side portion L2 is fixed by screws to a holder 7 on a fixed plate 3 in an electrical apparatus, two parallel plane portions 111 are symmetrically disposed with respect to a cutting plane, that is, with respect to a central axis of the main bus bar, and one or more pairs of through holes 14 (see fig. 1 and 2) opposed to the diameter of the cylindrical tube are provided on a cylindrical tube wall of the long side portion L2 of the letter L of the branch bus bar 1 in confronting the holder 7, and screw holes are provided on the holder in correspondence with the through holes for fixing to the holder 7 by screws 15 passing through the pair of through holes.

The flexible connection end 12 of the branch bus bar 1 is a circular plane with an end surface perpendicular to the axis of the main body, which is generally required to be connected to the flexible connection 4 of the vacuum circuit breaker shaped as a flat plate. When in connection, the flexible connection 4 is arranged below the annular end face of the flexible connection end 12, the opposite opening 121 is arranged on the outer wall of the hollow pipe of the flexible connection end 12 along a diameter, the movable nut 6 is inserted into the opening 121, the end part of the movable nut 6 is clamped in the opening 121 on the outer wall of the hollow pipe, so that the movable nut 6 is movably held in the hollow pipe, the movable nut 6 is provided with a threaded hole, the flexible connection 4 is provided with an opening (not shown) corresponding to the threaded hole on the movable nut 6, a screw is used for penetrating the opening on the flexible connection 4 along the axial direction of the branch bus 1 from the lower part of the flexible connection 4 and screwing the opening in the threaded hole of the movable nut 6, and the flexible connection 4 and the flexible connection end 12 of the branch bus 1 are fastened together. It can be seen that the flexible connection end 12 of the branch bus 1 according to the present invention can be reliably connected to the flexible connection in a simple manner with fewer parts.

The movable nut 6 can be realized in various forms, for example, the movable nut 6 can include a rod portion, the rod portion is in a long strip shape, the middle portion of the rod is provided with a screw hole perpendicular to the axial direction of the rod, the rod can penetrate into the pipe from an opening on the pipe wall on one side of the branch bus 1 to reach an opening on the pipe wall on the other side, the two ends of the rod are respectively clamped and kept in the opening, or the movable nut 6 can be a metal piece in a shape like a Chinese character 'ji' formed by bending a metal sheet, a threaded hole is arranged in a middle convex part, two support legs symmetrically and straightly extend in relation to the middle convex part, the movable nut can extend into the hollow pipe of the branch bus 1 from the lower end of the branch bus 1 and is respectively clamped and kept in the opening arranged on the pipe wall along the diameter through the two support legs, and any form.

As can be seen from fig. 3, the outer diameter of the hollow tube of the branch bus bar 1 is larger than the fixed support 7 and is similar to or slightly smaller than the width of the flexible connection 4, so as to shield the electric field of the fixed support 7 and the flexible connection 4 by the cylindrical branch bus bar 1, thereby avoiding the uneven distribution of the electric field caused by the non-smooth shape or sharp corner of the fixed support 7 and the flexible connection flat cable 4. In this embodiment, the outer diameter of the branch bus bar 1 may be set according to actual use conditions, as long as it can shield the electric field of other non-smooth-shaped electric elements around the branch bus bar to make the electric field uniform.

The utility model provides a branch generating line 1 is not necessarily L form shape, can take required shape, for example the orthoscopic shape according to the tie point position.

To sum up, according to the utility model discloses a branch generating line simple structure, material saving, reduce cost have the function of electricity connection, heat dissipation and even electric field, can realize main generating line to vacuum circuit breaker's reliable electricity with simple mode, less part and connect, can realize all electrical connection points about the center axis symmetry of main generating line.

The various features mentioned in the present disclosure may be combined in different embodiments without departing from the scope of the present disclosure.

While the best modes for carrying out the invention have been described in detail, those familiar with the art to which this invention relates will recognize various alternative designs and embodiments for practicing the invention within the scope of the appended claims.

Claims

1. A branch bus for connecting a main bus and a flexible connection of a vacuum circuit breaker, comprising:

2. The branch busbar according to claim 1, wherein the two parallel planar portions are formed by cutting a cut to a depth along a cutting plane passing through a diameter of the longitudinal axis of the body and the end plane, and then flattening the cut two semi-hollow cylindrical tubes along two planes parallel to the cutting plane and spaced apart by the distance, respectively.

3. The branch busbar according to claim 1 or 2, wherein the two parallel planar portions of the main busbar connection end are provided with holes, respectively, for connecting the main busbar connection end to the main busbar by passing screws through the holes and the main busbar.

4. Branch busbar according to claim 1 or 2, wherein the distance is substantially the same as the thickness of the main busbar and the two parallel planar portions are symmetrically arranged with respect to a cutting plane.

5. The branch bus-bar according to claim 1 or 2, wherein the flexible connection end is a ring plane with an end surface perpendicular to the axis of the main body, and the branch bus-bar forms a tight connection with the flexible connection of the vacuum circuit breaker through the ring plane.

6. The branch bus bar according to claim 5, wherein the flexible connection end comprises opposite openings diametrically arranged on the wall of the hollow cylindrical tube, and a movable nut with an end portion clamped in the opening, and the flexible connection of the vacuum circuit breaker is provided with a through hole corresponding to the position of the threaded hole of the movable nut, so that the flexible connection of the vacuum circuit breaker is connected with the flexible connection end of the branch bus bar by a screw passing through the through hole and being screwed into the threaded hole.

7. The branch busbar according to claim 2, wherein the branch busbar is bent in the shape of letter L in the cutting plane, the main busbar connection end is located at a short side portion of the letter L, the flexible flat cable connection end is located at a long side portion of the letter L, and the short side portion and the long side portion are connected by a transition portion having a rounded corner.

8. The branch busbar according to claim 7, wherein a long side portion of the letter L of the branch busbar is adapted to be vertically mounted to a mount fixed to a mounting plate.

9. The branch bus bar of claim 8, wherein the outer diameter of the branch bus bar is larger than the width of the support, and is similar to or slightly smaller than the width of the flexible connection, so that the electric field of the support and the flexible connection can be shielded by the branch bus bar.

10. Ring main unit comprising a vacuum interrupter, the flexible connection of which is connected to the main bus by a branch bus according to any of the preceding claims 1-9.