JPS5838752Y2 - Connection device for busbar and branch conductor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a main bus bar that is insulated and supported within a distribution board housing a large number of circuit breakers, and to which branch conductors leading to the circuit breakers are connected.

Typically, this type of main bus bar is arranged horizontally over almost the entire width of the box, and each branch conductor is connected by bolts.

Conventionally, the main bus bar used 91 conductors per wire, and bolt through holes were provided at locations where the branch conductors were connected by bolts.

However, the connection positions of the branch conductors differ depending on each phase, and the dimensions between the terminal poles of the circuit breaker also differ depending on the frame size, so machining the bolt through holes in the main bus bar is extremely complicated.

The present invention attempts to eliminate the above-mentioned drawbacks of the conventional method by configuring each main bus bar with at least two conductors and using the gap between the two conductors as a bolt penetration groove. be.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

Figure 1 is a single-line diagram showing the connection configuration between busbars and branch conductors of a switchboard. 1 is a circuit breaker made of various frame sizes, 2 is a main busbar arranged in upper and lower stages, and 3 is a main busbar. A joint conductor connects the busbars, and 4 is a branch conductor.

100 represents one side of the switchboards arranged side by side.

Further details will be explained with reference to FIGS. 2 to 5.

In the figure, reference numeral 2 denotes main busbars arranged with a gap S in the horizontal direction, and a set of two main busbars forms one phase.

The main bus 2 is divided into each switchboard 100, and the boards are connected by a joint conductor 3.

4 is a branch conductor leading to a wiring breaker, into which a press nut 9 having a knurled portion 9A is press-fitted on the back side, and a disc spring 11
．． It is tightened by a bolt member 10 passing through the gap S via a U-shaped washer 12.

The gap S is configured to be approximately the same as the diameter of the bolt member 10, and the diameters of the press nut 9 and disc spring 11 are made large enough to sufficiently contact the two main busbars 2 to apply sufficient contact pressure to the branch conductor 4.

Furthermore, the U-shaped washer 12 is long arranged on the two main busbars 2, and is tightened together with the branch conductor 4 while sandwiching the two main busbars 2.

The main bus bar 2 is insulated and supported at both ends by a switchboard frame member 8 by an insulator 5 and a mounting bracket 7.

And they are fixed by bolt members 6.

When increasing the current capacity of the main bus, the main bus 13 and joint conductor 14 are made to have a larger width as shown in FIG.

Even in this case, the gap S is eccentrically fixed on the insulator so that it is the same as shown in FIG.

In addition, if the press nut 9 with a large diameter and the disc spring 11 are used, sufficient contact pressure can be applied to the branch conductor 4J, and the branch conductor 4J can be applied to a large current.

Further, when the rated current of the branch conductor is small and the short circuit current is also small, a normal spring washer and a plain washer may be used without using the disc spring 11 or the washer 12 having a U-shaped cross section.

Furthermore, although the tightening workability is inferior, instead of the press nut 9, an ordinary nut or a nut whose opposite side is particularly large may be used.

As described above, according to the configuration of this invention, the same main bus bar can be used for each phase for any branch conductor, and the only machining required is the fixing holes at both ends and the holes for connection between panels. As a result, productivity is greatly improved.

The U-shaped washer 12 has a high strength in the tightening direction, and since it sandwiches the upper and lower main bus bars 2 together with the branch conductor 4, it can also prevent the main bus bar 2 from being twisted by electromagnetic force in the event of a short circuit accident.

Furthermore, even if the width of the main bus bar changes, the gap S remains the same, so there is no need to change the branch conductor depending on the current capacity of the main bus bar, and the mounting fittings 7 and the like can be standardized.

[Brief explanation of drawings]

FIG. 1 is a diagram showing, by a single line, the configuration of a busbar connection of a switchboard according to an embodiment of the present invention. Figure 2 is a front view of the main parts of Figure 1, Figure 3 is a plan view of the same, and Figure 4 is a front view of the main parts of Figure 1.
The figure is a cross-sectional view of IV-IV in Fig. 2, and Fig. 5 is a cross-sectional view of V-IV in Fig. 2.
(2) Cross-sectional view FIG. 6 is a cross-sectional view of another embodiment corresponding to FIG. 4. In the figure, 2 is the main busbar, 4 is the branch conductor, S is the gap, and 9
1 is a press nut, 10 is a bolt member, and 12 is a U-shaped washer.

Claims (2)

[Scope of utility model registration request] (1) - A connecting device for connecting a bus bar configured by arranging at least two conductors parallel to each other with a predetermined gap and a branch conductor connected to this bus bar, A bolt member that passes through the gap between the busbars and the branch conductor, a washer that is combined with the bolt member and extends over the two conductors, and is screwed into the bolt member to tighten the busbar and the branch conductor. A connecting device for connecting a bus bar and a branch conductor, comprising a nut member for attaching and fixing the bus bar to a branch conductor. (2) The bus bar and branch conductor according to claim (1) of the utility model registration, characterized in that a washer with a U-shaped cross section is used as the washer, and the length is approximately the same as the contact portion between the branch conductor and the bus bar. connection device.