JP2968068B2 - Busbar connection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bus connecting apparatus for butt-connecting solid-insulated buses used in switch gears and the like.

[0002]

2. Description of the Related Art Conventionally, in a switchgear or the like, a solid insulated bus in which an internal conductor is molded with an insulating material is used, and the size of the switchgear or the like can be reduced.

For example, FIG. 4 shows an overall configuration of a switchgear to which the present invention is applied. A solid-insulated three-phase bus 2 is provided on the back surface of a box body 1 in which the inside is air-insulated or gas-insulated. This is arranged in the container 3.

In FIG. 1, reference numeral 4 denotes an upper primary disconnecting portion, and reference numeral 5 denotes a lower primary disconnecting portion having a built-in current transformer. Are connected to the inner conductor of the bus 2. Reference numeral 6 denotes a cable connector of a cable 7 detachably connected to the upper primary disconnecting section 4, and 8 denotes a circuit breaker or a switch housed in the box 1 so as to be able to enter and exit. It is connected.

[0005] When the switchgear having such a configuration is installed in the side panel and the buses 2 are connected to each other,
Conventionally, a bus connecting device as shown in FIG. 5 is used.

That is, a solid round rod-shaped internal conductor 10 is attached to the mounting plate 9 constituting the rear wall of the box 1 by the epoxy resin 1.
A busbar joint 12 molded in 1 is penetrated, and the busbar joints 12 of the adjacent box bodies 1 are connected by a busbar 15 in which a solid round bar-shaped internal conductor 13 is molded with rubber 14.

[0007] Finger contacts 16 connected to the internal conductor 10 are respectively attached to both ends of the bus bar joint 12 by bolts 17, and the tips of the contacts 16 protruding from the end surface of the bus bar joint 12 are connected to the ends of the bus bar 15. Fixed contacts 1 inserted at both ends of the inner conductor 13 of the bus 15
8 is connected to the peripheral surface so as to be able to freely contact and separate.

At the time of this bus connection, first, one end of the bus 15 is brought into contact with the end of the bus bar joint 12 attached to the box body 1 and the finger contact 16 is fixed to the fixed contact 1.
In a state where the bus bar 15 is in contact with the bus bar 15, the holding bar 20 is attached to the flange 19 and the bus bar 15 is connected to the bus bar joint 12 with the bolt 21.

Next, the other box 1 is arranged in a row, and its bus bar joint 12 is abutted against the other end of the bus bar 15, and the bus bar joint 12 is brought into contact with both contacts 16 and 18.
Are connected to the other end of the bus 15 with bolts 21. Thereafter, the boxes 1 are sequentially lined up while connecting the bus 15 in the same manner.

[0010]

In the conventional bus connecting device described above, the finger contacts 16 of the bus bar joint 12 are provided.
Is protruded from the end face, and this is inserted into the end of the bus bar 15 to be brought into contact with the fixed contact 18, so that the bus bar 15 cannot be removed only by removing the bolt 21 from the connection state of FIG. It is necessary to shift the mounting plate 9, that is, the box body 1 left and right.

For this reason, when a large number of boxes 1 are arranged in a row, only the bus 15 of the middle box 1 cannot be removed. It is necessary to replace the bus 15 or replace the box 1 while sequentially shifting the box 1 from side to side from the end of the box 1, and there is a problem that the workability is very poor.
5 needs to be supported while supporting the bus bar 15, which is a heavy object, and there is a problem that work fatigue is great.

SUMMARY OF THE INVENTION The present invention has been made in consideration of such problems of the prior art, and has as its object to facilitate connection work and to replace an intermediate bus bar even after a row board is constructed. Is to provide a bus connecting device that can be easily implemented.

[0013]

In order to achieve the above object, in a bus connecting apparatus according to the present invention, two buses of a solid insulation type in which an inner conductor is molded with an insulating material, and the two buses face each other. An annular insulating rubber provided movably in the length direction on the outside of each end, a fixed contact which is connected to the internal conductor at each end of the facing bus bar and faces closely adjacent to each other; and one fixed contact A movable contact that slides on the outside of the contact and comes into contact with the outside of the other fixed contact so that it can come and go, and is provided between both buses, covers the outside of the contact, and has both ends closely attached to and detached from both insulating rubbers. And a tubular insulating spacer freely mounted.

[0014]

In the bus connecting device having the above-described configuration, when the bus is connected, the ends of the two buses face each other, and the fixed contacts connected to the respective internal conductors are closely opposed to each other. The contact sliding on one fixed contact is moved to the other fixed contact and brought into contact therewith, and at the same time, the insulating spacer is moved to cover the outside of the contact. The rubber is moved so as to be in close contact with both sides of the insulating spacer, and the outside of the busbar connection part by the contact is insulated by the rubber surface pressure.

As described above, the bus connection can be made only by moving the contact, the insulating spacer, and the insulating rubber. When the bus is removed, the bus may be moved in the reverse manner as described above.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to FIGS.

FIG. 2 is a rear view of the state of the row of switchgears configured as shown in FIG.
Shows a bus connecting portion of the bus 2 of each switchgear arranged in the left-right direction on the back surface of the box 1.

As shown in FIG. 1, the bus bar 2 is of a solid insulation type in which a pipe-shaped internal conductor 22 is molded with an epoxy resin 23. It is formed in dimensions that do not fit.

In FIG. 1, fixed contacts 24 and 25 are fitted to and connected to the internal conductors 22 at both ends of the bus 2, respectively, and a part of each of the fixed contacts extends from the end face of the bus. The fixed contact 24 at the right end of the bus bar 2) and the fixed contact 25 at the left end of the other (right) bus 2 are closely opposed to each other.

In one fixed contact 24, a centering tool 26 is provided.
Which is fixed by the spring 27 to the fixed contact 2
3, the pin 28 of the alignment tool 26 is moved from the guide hole 29 of the fixed contact 24 to the guide hole 39 of the fixed contact 25 facing the same as shown in FIG. Guide the tip of the alignment tool 26 to the fixed contact 2
By inserting the two buses 5, the centering of both buses 2 is realized.

Reference numeral 31 denotes a plurality of tulip contacts slidably contacting the outside of one of the fixed contacts 24.
2, the respective contacts 31 integrally move to the left and right, and come into contact with the outside of the opposed fixed contact 25 so as to be able to freely contact and separate.

Reference numerals 33 and 34 denote cylindrical insulating rubbers provided on the outer sides of both ends of the bus bar 2 so as to be movable in the longitudinal direction, and the outer peripheral surfaces of both ends are tapered. Numeral 35 is a movable cylindrical insulating spacer which is provided so as to bridge between the opposite ends of the busbars 2 and covers the outside of the contact 31. The tapered surfaces of the insulating rubbers 33 and 34 are formed on the inner peripheral surfaces of both ends. A tapered surface that is in close contact with is formed.

An annular shield internal electrode 36 is buried inside the insulating spacer 35.
An annular inner protrusion 37 for moving the contact 31 via the holding body 32 is integrally formed with the outer spacer 38. Further, an annular outer protrusion 38 is integrally formed on the outer peripheral surface of the center of the insulating spacer 35. By fixing the external projections 38 to the positioning support plate 39 fixed to the back surface of the body 1 with bolts and nuts, the insulating spacer 35 can be fixed at a position covering both busbars 2.

Reference numerals 40 and 41 denote cylindrical protective fittings which are detachably attached to both end surfaces of the insulating spacer 35 by bolts, respectively, and tapered insulating rubbers 33 and 34 are provided inside the protective fittings 40 and 41, respectively. Annular compression fittings 42, 43 having tapered surfaces that are in close contact with the surfaces are movably provided between the annular substrates 44, 45 and the compression fittings 42, 43 whose positions are regulated in the protection fittings 40, 41, respectively. , Each has a spring 46 interposed therebetween.
By tightening bolts 0 and 41 to the insulating spacer 35, the spring 46 is compressed, and the compression fittings 42 and 4 are compressed.
The insulating rubbers 33 and 34 are respectively pressed against the insulating spacer 35 from both sides thereof with a constant force via 3, and insulation is secured by the surface pressure on the mutual tapered surfaces.

In such a configuration, when removing the busbar from the connection state of FIG. 1, first, the protection bracket 40 on one busbar 2 side and the insulating spacer 35 are unfastened by bolts, and the protection bracket 40 is compressed by the compression bracket 42. , Together with the insulating rubber 33, to the left to the position indicated by the two-dot chain line, and similarly remove the bolting of the protective fitting 41 on the other busbar 2 side.

Next, the bolts between the support plate 39 and the insulating spacer 35 are removed, and the insulating spacer 35 is connected to both buses 2.
Move to the left until the split position of
Also moves to the left to a position where all of the fixed contacts 24 ride, and further guides the centering tool 26 from the guide hole 30 of the fixed contact 25 to the guide hole 29 of the fixed contact 24. To move it into the fixed contact 24.

In this state, the two buses 2 are completely separated from each other, and even if the box 1 is an intermediate board, it can be pulled out by moving it backward.

When connecting the buses, two buses 2
Are opposed to each other in a butt state, and the opposed fixed contacts 24 and 25 are aligned by the centering device 26, the insulating spacer 35 is moved rightward, and the contact 31 is moved to the fixed contact by the internal protrusion 37. The outer projection 38 is fastened to the support plate 39 to position the insulating spacer 35.

Further, the insulating rubbers 33 and 34 are moved to both sides of the insulating spacer 35, and the protective fitting 40 is fastened to the insulating spacer 35, a predetermined rubber surface pressure is formed, and the bus connection is completed.

[0028]

Since the present invention is configured as described above, it has the following effects.

A contact for connecting the fixed contacts of the two bus bars facing each other in an abutted state, an insulating spacer covering the outside of the contact, and an insulating member which is in close contact with both sides of the insulating spacer to secure insulation by surface pressure. The rubber can be freely moved in the length direction of the bus bar, and these can be moved to connect and disconnect the bus bar. Therefore, there is no need to perform work while supporting the heavy bus bar as in the past. In addition to the above, the intermediate bus can be replaced even after the switchgear trains are configured, so that on-site work can be shortened and simplified.

[Brief description of the drawings]

FIG. 1 is a cut-away plan view of a bus connecting portion showing an embodiment of a bus connecting device of the present invention.

FIG. 2 is a rear view of the switchgear at the time of a row board.

FIG. 3 is a rear view showing a state where two fixed contacts are aligned.

FIG. 4 is a schematic side view of a switchgear.

FIG. 5 is a cut-away plan view showing a conventional bus connecting portion.

[Explanation of symbols]

 2 bus bar 22 internal conductor 23 epoxy resin 24 fixed contact 25 fixed contact 31 tulip contact 33 insulating rubber 34 insulating rubber 35 insulating spacer

Continued on the front page (56) References Japanese Utility Model Showa 60-7611 (JP, U) Japanese Utility Model Showa 56-106015 (JP, U) Japanese Utility Model Showa 50-113827 (JP, U) (58) Fields surveyed (Int) .Cl. ⁶ , DB name) H02G 5/06-5/08 H01R 4/58 H02B 1/20 H02B 13/06

Claims (1)

(57) [Claims] 1. A bus connecting apparatus for connecting two buses of a solid insulation type in which an inner conductor is molded with an insulating material to connect two buses in abutting state, wherein the buss are moved in a length direction outside respective opposite ends of the buses. A ring-shaped insulating rubber freely provided, fixed contacts connected to the inner conductors at the both end portions and opposed to each other, respectively, and the other fixed contact which is slidably in contact with the outside of one fixed contact A movable contact that comes into contact with the outside of the
A bus connecting device comprising: a tubular insulating spacer provided between the buses and covering the outside of the contact and having both ends closely attached to and detachably attached to the insulating rubbers.