JPS58119710A - Bus connecting device for enclosed switchboard - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bus connection device for a closed power distribution board, and more particularly to a connection device for an insulated busbar used in a closed power distribution board or large current power distribution board.

The outline of a conventional closed switchboard for large power and large current is shown in the attached drawings, Figures 1 and 2. In the figures, the symbol / indicates the casing of the closed switchboard, and ko indicates the above-mentioned casing. This is a circuit breaker installed inside a body 1, and bushings A and B that can be connected to busbars or cables are provided on the top and bottom 1 of the circuit breaker. In addition, 3 is a current transformer attached concentrically to the bushings UL and B, and DA and J are connection conductors attached to the tips of the bushings A and B, respectively, and their outer surfaces are not insulated by integral casting. A cover is formed thereon, and the mounting is fixed to the casing l by means of a mounting section. Further, 7 is an insulated bus bar used for preventing arc accidents and reducing the size of the housing, and this insulated bus bar is connected to the above-mentioned connecting conductor DA by a bus bar connecting device S. By the way, the code? A bolt is used to tighten the connecting conductor DA and S to the mounting base 6 fixed to the casing l.

The busbar connection device for the insulated busbars in such a closed distribution board is constructed as shown in FIG. 3 of the attached drawings, and the insulated busbars 7. The connecting conductor member 20 that connects the circuit breaker is integrally formed with the connecting conductor bow which is connected to the bushings Ja and B of the circuit breaker C as shown in Fig. An outer covering 0a is formed, and further,
Inside thereof, a through hole Ob is formed along the longitudinal direction into which one of the busbars to be connected is inserted. Furthermore, an insertion conductor is inserted at the tip of the conductor portion 7a of the insulated bus bar 7!
/ are integrally connected by screwing, and the outer diameter of the inserted conductor 2 is slightly smaller than the inner diameter of the through hole (7b) of the connecting conductor member -0, and the outer periphery of the inserted conductor Two fin-shaped contacts 2 are installed in the small gap between the insertion conductor 2/ and the through hole Qb, and the outer periphery thereof is in contact with the inner surface of the through hole Qb. There is.

Furthermore, a retaining ring 3 and a screw are fitted on the outer periphery of the screwed connection side of the insertion conductor 1, and a ring is fitted on the outer periphery of the screwed connection between the insertion conductor 1 and the conductor portion 7a of the insulated bus bar 7. Holes 2S and -6 are formed for the hook for the spanner, and the insertion conductor J/
The bus bar connecting device g and the insulating bus bar 7 are protected by an insulating core. Further, in the case of such a large power and large current, a plurality of contacts 22 are usually attached depending on the current capacity.

In the conventional busbar connection device having the above configuration, in order to connect the insulated busbar 7, first, the connecting conductor is tightened to the mounting base. and insert the conductor.
The connection is made by inserting the insulated bus bar 7 into the connecting conductor member -0 and screwing the insulated bus bar 7 into the inserted conductor member -1.

However, because there are manufacturing errors in the housing, mounting base, connecting conductor members, insertion conductors, etc. of the closed switchboard, when the long busbar connecting the closed switchboard is received by the busbar connecting device S, the adjacent If the center line with the board is off,
When screwing the inserted conductor and the conductor portion 9a of the insulated bus bar 7, the screw portion may seize or the two contacts cannot be expected to make reliable contact with the inner surface of the through hole 20b of the connecting conductor member 20. Therefore, in such a state, the insulated busbar 7 is temporarily attached to the busbar connection device S, and then, after adjusting the mounting position of the connecting conductor DA with respect to the mounting base 6, tightening is performed using the bolt f. The connecting conductor must be fixed. Moreover, such adjustment is extremely difficult to perform due to the large number of busbar connection devices g.
If center deviation occurs, not only will reliable contact not be obtained, but unreasonable loads such as expansion and contraction of the insulated bus due to temperature will be applied between the insulated bus and the connecting conductor, resulting in damage. In some cases, this may result in

The present invention eliminates the drawbacks of the conventional busbar connection device for closed switchboards as described above, can sufficiently absorb assembly errors and expansion and contraction of the busbar, ensures reliable contact, and improves the workability of busbar connection. The object of the present invention is to provide a high-power, high-current closed switchboard busbar connection device that is of good quality.

In order to achieve this object, the present invention provides an insertion conductor that is screwed to the tip of a conductor portion of a single insulated bus bar to be connected, and has a large diameter on the threaded side and a small diameter on the tip side; A connecting conductor member having a through hole formed with an inner diameter slightly larger than the large diameter of the inserted conductor so that the conductor is inserted with a slight gap, and having an insulating jacket on the outer surface, and each of the above insertions. one fin-shaped contact formed from a thin plate installed in the large diameter part of the conductor and whose outer peripheral end is in pressure contact with the inner surface of the through hole; and a spring contact formed to press against the inner surface of the through hole of the connecting conductor member, and the insulated bus bar is supported by the fin-shaped contact portion and the inserted conductor portion. It is something.

Hereinafter, the present invention will be explained based on FIG. 3 of the accompanying drawings showing one embodiment thereof.

The connecting conductor member 〇 for connecting the insulated busbar is constructed integrally with the connecting conductor bow which is connected to the bushings a and b of the circuit breaker, as shown in Fig. 2, and the outer peripheral surface thereof has a The fact that the insulating outer sheath 20eL is formed from the integrally cast I, and that a through hole 20b is formed therein along the longitudinal direction into which the insertion conductor to be coupled to the insulated bus bar 7 is inserted is formed. This is similar to that in the conventional device.

However, in the present invention, an insertion conductor 30 is integrally connected to each tip of the conductor portion 7a of both insulated busbars 7 by a screw I, and this insertion conductor 3
The outer diameter of 0 is a little smaller than the inner diameter of the through hole ○b of the connection conductor member ○, which is the large diameter portion 3 formed on the screw side.
0a, and a small diameter portion 30b formed on the tip side smaller than the inner diameter, and the outer periphery of each large diameter portion 30a is provided with a small diameter portion 30b interposed in a minute gap between it and the inner surface of the through hole 20b. Seven fin-shaped contacts 31 are provided whose outer peripheral ends press against the inner surface of the through hole θb, and on the outer periphery of the small diameter portion 30b are located approximately in the middle of the through hole θb. The central portions of the three highly springy spring contacts mounted in the hole press against the inner surface of the through hole -0b. Therefore, both end portions of the three spring contacts are pressed into contact with the small diameter portion Job of the insertion conductor 30 coupled to each insulated bus bar 7.

In addition, the retaining ring λ3. The hooks for rods, spanners, etc. are hole-shaped S, the structure of the rollers and their uses are the third type in conventional equipment.
It is exactly the same as shown in the figure.

Since the device of the present invention is configured as described above, the insertion conductor 3θ is supported at one point in the fin-shaped contact 31 portion, and the tip portion is a highly springy spring contact 3.
Therefore, the tip of the insertion conductor 30 can move freely to some extent using the fin-shaped contact 31 as a fulcrum, and the insertion conductor 30 and the through hole 20b of the connecting conductor member J47 are prevented from being misaligned. Even if it happens, the contact 31 and spring tact 12 will prevent
Good contact is obtained, and as a result, welding of the contact portion does not occur during short circuits caused by high power.

In addition, since the insertion conductor 30 is supported at one point with respect to the connecting conductor member 0, there is no need to adjust the connecting conductor when assembling the conventional insulated busbar into the busbar connection device, which improves work efficiency. Not only does this improve the contact 31 and the three spring contacts, it also prevents excessive stress from being applied to the busbars due to expansion and contraction of the busbars due to temperature changes. Conductor portion 7a and insertion conductor 3
There is also no seizure of the threaded part that connects 0.

As described above, according to the present invention, the insertion conductor is supported at one point and electrically and mechanically coupled by a combination of one contact and a spring contact. Expansion and contraction of the insulated bus bar can be completely absorbed, and it is also easier to assemble the conductor part of the insulated bus bar and the inserted conductor.As a result, it is no longer necessary to adjust the position of each part for connecting the bus bar as in the conventional method. This has the effect of not only improving the workability of the connection, but also ensuring reliable contact.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view of a closed switchboard for high power and large current equipped with a conventional busbar connection device, Fig. 2 is a sectional view taken along the seal-drawing line, and Fig. 3 is a line 1-1 in Fig. 1. Enlarged cross-sectional view by
FIG. 4 is a sectional view of an embodiment of the busbar connection device according to the present invention. L...Housing, Koken/Connector, Da, S...Connecting conductor, Ri...
・Insulated bus bar, 7a...Conductor part, 71)...Insulated jacket, t
・・Bus bar connection device, −〇・・Connection conductor member, 20b・−
Through hole, 1, 30...insertion conductor, 22, J/...contact, 23,211...retaining ring, 30a...large diameter part, 30b...small diameter part, 3...spring contact. Agent Shin Kuzuno −

Claims (1)

[Claims] The insertion conductor is screwed to the tip of the conductor of one insulated bus bar to be connected, and the screw is connected to an insertion conductor formed with a large diameter and a small diameter on the tip side, and the insertion conductor is inserted with a slight gap. A connecting conductor member having a through hole formed with an inner diameter slightly larger than the outside diameter of the large diameter portion of the insertion conductor and having an insulating jacket on the outer surface, and a connecting conductor member installed in the large diameter portion of each of the insertion conductors mentioned above. one fin-shaped contact formed by a thin plate whose outer peripheral end is in pressure contact with the inner surface of the through hole; both ends are in pressure contact with the small diameter portion of each insertion conductor, and the center portion is in pressure contact with the inner surface of the connection conductor member. A busbar connection device for a closed switchboard, comprising a spring contact formed to press against the inner surface of the through hole, and configured so that the insulated busbar is supported by the fin-shaped contact portion and the insertion conductor portion.