JP2000188805A - Connection conductor device of distribution board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase insulation of a connection conductor device connecting a main breaker with bus bars in a distribution board, and reduce the man-hour for connection. SOLUTION: Connection conductors 12, 13, 14 of the respective phases are set so as not to overlap with each other when viewed from above. Main terminal parts 12a, 13a, 14a of the conductors are conformed to a load side terminal 4 of a main breaker 3 and are arranged in a lateral row on the same plane. Connections 12b, 13b, 14b with bus bars 5, 6, 7 are conformed to the bus bars 5, 6, 7 and are arranged stepwise, while the positions are shifted descending toward connection terminals. These connection conductors 12, 13, 14 are accommodated in and fixed to an insulating case 15, whose upper surface is opened from above. The bus bars 5, 6, 7 inserted form the side surface are stacked on the connections 12b, 13b, 14b and are fastened with screws.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distribution board mainly used as a light distribution board, and more particularly to a connection conductor device for connecting a main circuit breaker and a bus bar.

[0002]

2. Description of the Related Art Light distribution boards are mainly single-phase three-wire systems.
In this case, in order to connect the main circuit breaker and the branch circuit breaker, the main circuit breaker is connected to three main conductors (bus bars) made of rectangular conductors arranged parallel to each other in the width direction along the bottom of the distribution board. Generally, a configuration is adopted in which branch circuit breakers arranged in two rows on both sides of the bus bar are connected to both ends of a branch conductor which is connected and screw-connected perpendicularly to the bus bar (see Japanese Utility Model Application Laid-open No.
No. 13006, etc.).

However, in the above configuration, since the bus bars are arranged in a plane, a required space in the lateral direction is large, and the screw connection between the bus bar and the branch conductor and the screw connection between the branch conductor and the branch breaker are troublesome. There is such a problem. Thus, as a solution, there is a configuration according to Japanese Utility Model Application Laid-Open No. 59-44106. This should be 3 orthogonal to the bottom of the board.
While arranging the busbars, a connection blade is attached to the mounting surface (bottom surface) of the branch circuit breaker, and the branch circuit breaker is inserted into the busbar via the connection blade from above and connected.

In the construction according to Japanese Utility Model Application Laid-Open No. 59-44106, the busbars are arranged so as to be orthogonal to the bottom surface of the board, so that the required space in the horizontal direction is reduced, and the branch circuit breaker is mounted on the busbar from above. It is advantageous in that the branch conductor and the screw connection are not required because the connection is made by direct insertion. However, since only one row of branch breakers can be connected to three single row bus bars, two rows of bus bars are required to arrange and connect two rows of branch breakers on both sides of the main breaker. There is a problem.

[0005] On the other hand, the inventors of the present application first set the width to 25.
Developed a 1-pole, 2-pole type circuit breaker (wiring breaker and earth leakage breaker) that accommodates a 2-pole switch within the JIS agreement size of mm. (Japanese Patent Application No. 9-147345). This circuit breaker can be wired by a single circuit breaker with a common width (25 mm) for both the 100 V circuit and the 200 V circuit in a single-phase three-wire circuit. It is intended to reduce the installation space and the number of wiring steps.

Further, the inventors of the present application have disclosed a distribution board in which a small two-row branch circuit breaker can be plugged in and connected, and a branch circuit breaker used therefor, and in particular, the above-mentioned collective one-pole size / two-pole circuit breaker. A branch circuit breaker suitable as a circuit breaker has been developed, and a patent application has been previously filed by the applicant of this application (Japanese Patent Application No. 10-076655). The distribution board according to this application has a structure in which three bus bars made of a rectangular conductor for connecting a main circuit breaker and a branch circuit breaker are arranged in a stacked manner via an insulating bush, whereby the three bus bars are connected to the bus bar 1. The required space is reduced by keeping it within the width of the main body, and the branch conductor is not required by inserting and connecting a branch breaker to both sides of the bus bar.

[0007] The present invention relates to the above-mentioned distribution board in which bus bars of a plurality of phases are arranged in a plane, and its object is to devise a connecting conductor device for connecting the main circuit breaker and the bus bar to enhance insulation between conductors. While further reducing the required space,
Another object of the present invention is to reduce the number of conductor connection steps.

[0008]

In order to solve the above-mentioned problems, the present invention is used to connect between a load terminal of a main circuit breaker and a bus bar in a distribution board, and one end of the load side is provided at one end. Connection of a distribution board having a main terminal portion to be screw-connected to a terminal and a connection conductor comprising a flat plate conductor having the same number of phases as the bus bar and having a connection portion to be screw-connected orthogonally to the bus bar at the other end. In the conductor device, while the main terminal portions of each phase are arranged in a horizontal line in the same plane in accordance with the load-side terminals of the main circuit breaker, the connection portions are aligned with the bus bars, and the phases are not overlapped with each other. The connecting conductors arranged in a stepwise manner descending toward the connection terminal side of the bus bar have partition walls that insulate between the phases and between the bus bars, and are stored and fixed from above in an insulating case having an open upper surface. And the insulation Overlapping the bus bar inserted from through holes in the side of over scan the connecting portion of the connecting conductor, and is to tighten the screws from the upper opening of the insulation case (claim 1).

According to the first aspect of the present invention, since the connection conductor is housed in the insulating case, the interphase insulation is strengthened and the interphase distance of the connection portion of the connection conductor can be shortened accordingly. Space requirements are also reduced.
The connection conductors arranged in a stepwise manner so as to descend toward the connection terminal side of the bus bar so that the connection portions do not overlap each other between the phases are accommodated from above in the insulating case and fixed, thereby connecting the connection conductors of each phase. Are integrated as a unit with an insulating case, which makes handling easier and
The bus bar inserted into the through hole in the insulating case is overlapped on the connection part of the connection conductor, and tightened with a screw from the top opening of the insulation case. Since the screws do not overlap, the screw tightening operation is facilitated, and as a result, the number of connection steps is reduced.

[0010] In the first aspect, each of the connection conductors includes:
It is preferable that distribution terminals for connecting the main circuit breaker to another circuit other than the bus bar are formed integrally with each other, and these distribution terminals are arranged in a horizontal line parallel to the side surface of the bus bar in the same plane. (Claim 2). When the main terminal portion and the connection portion of the connection conductor are provided in directions orthogonal to each other, the distribution terminal portion can be formed on an extension of the connection portion (Claim 3).
It is preferable that the height positions of the main terminal portion and the distribution terminal portion of the connection conductor are aligned (claim 4).

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, Fig. 1 shows the connection between the bus bar in the distribution board and the circuit breaker.
(A) is a front view, (B) is its bottom view. In FIG. 1, a mounting base 1 made of a steel plate is formed by bending mounting flanges 1 a on both right and left sides, and is fixed to a bottom surface of a distribution board body (not shown) by screws passing through mounting holes 2. A three-pole main circuit breaker 3 is fixed to the upper center of the mounting base 1 by screws, and three bus bars 5, 6, and 7 constituting R, N, and T phases are connected to the load-side terminal 4, respectively. It is connected via a conductor device 8.

The bus bars 5, 6, and 7 are made of rectangular conductors of the same size, and are arranged in a flat stack via insulating bushes 9 (FIG. 1 (B)) inserted at several locations in the longitudinal direction, that is, the bottom surface of the distribution board. Are arranged in parallel at equal intervals in the vertical direction, and are fastened to the mounting base 1 by screws 10 penetrating the insulating bush 9. The busbars 5, 6, and 7, which are R, N, and T phases, respectively, constitute a single-phase three-wire circuit, with 100 V AC between the R phase and T phase and between the T phase and N phase, and 200 V AC between the R phase and T phase. ing. On the left and right sides of the bus bars 5, 6, and 7, a large number of two-pole branch circuit breakers 11 are arranged in a horizontal row, and the power supply side thereof is connected to the bus bars 5, 6, via a terminal plug (not shown).
7, and its detailed configuration will be described later.

2 to 5 show the main circuit breaker 3 and the bus bar 5,
FIG. 2 is a plan view, FIG. 3 is a cross-sectional view taken along the line III-III, FIG. 4 is a perspective view of a connection conductor, and FIG. 5 is a perspective view of an insulating case. FIG. In these figures, R, N and T phase connection conductors 12,
13 and 14 are cut out and bent into the illustrated shape by pressing a copper plate, and formed in an L-shape when viewed from above. Here, the connection conductors 12, 13, 14 are connected to the main terminals 12a, 13a, 14a connected to the load-side terminals 4 (FIG. 1) of the main circuit breaker 3 and the bus bars 5, 6, 7, respectively. It has distribution terminals 12c, 13c, 14c for connecting the parts 12b, 13b, 14b and the main circuit breaker 3 to circuits other than the bus bars 5, 6, 7, respectively.

The main terminals 12a, 13a and 14a are arranged in a horizontal line in the same plane in accordance with the load terminals 4 (FIG. 1) of the main circuit breaker 3, and the connecting portions 12b, 13b and 14b are connected to busbars 5 and 6 respectively. , 7, the main terminal portions 12a, 13a, 1
The bus bars 5, 6, 7 are arranged in a stepwise manner descending toward the connection terminal side (the left side in FIG. 2) so as not to overlap each other between the phases. The distribution terminals 12c, 13c, and 14c are arranged in a horizontal line in parallel with the side surfaces of the bus bars 5, 6, and 7 in the same plane at the same height as the main terminals 12a, 13a, and 14a. Main terminal 13a and connection 13b of connection conductor 13
Is a relay portion 13 that bypasses the connection portion 14b of the connection conductor 14.
d, the main terminal 12a of the connection conductor 12 and the connection 1
2b is a connection portion 13b and a relay portion 13d of the connection conductor 13.
Are connected by a relay section 12d that bypasses the. Connection conductor 14
Are connected to the connection conductors 12,
13 and are directly connected in an L-shape in the opposite direction.

In FIG. 5, an insulating case 15 made of a molding resin is a box with a bottom having an open upper surface and two orthogonal side surfaces, and a partition 15a for insulating the phases of the connection conductors 12, 13, 14 from each other. Accommodation space 15b, 15
c, 15d are formed so as to extend between the side surfaces of the opening, and the main terminal portions 12a, 13 of the connection conductors 5, 6, 7 are formed at both ends thereof.
Terminal blocks 15e and 15f on which the terminals a, 14a and the distribution terminal portions 12c, 13c, 14c are arranged are formed on the same plane. Further, the connection conductor accommodating space 15b,
15c and 15d are partitioned into three upper and lower stages by partition walls 15g (FIG. 3) for insulating the phases of the bus bars 5, 6, and 7, and through holes 15h and 15h of the bus bars 5, 6, and 7 are provided on the side surface of the insulating case 15.
15i, 15j are connection conductor accommodating spaces 15b, 15 of each stage.
c, 15d. Each through hole 1
5h, 15i, and 15j are connection conductors 1 corresponding to lower surfaces thereof.
2, 13 and 14 are formed to be the same as the upper surfaces of the connection portions 12b, 13b and 14b, and have cross-sectional dimensions of bus bars 5, 6, 7
There is room in the thickness direction, but the busbars 5, 6, and 7 are set so as to fit through a slight gap in the width direction.

Therefore, the connection conductors 12, 13, and 14 are connected to the connection conductor housing space 15b,
15c and 15d, respectively, and the main terminal portions 12a,
The insulating case 15 is inserted into the screw holes 16 of FIG.
Is fixed by 17 (FIG. 3) screwed from the back side through the through hole 15k. 2 and 3 show the connecting conductor device 8 thus configured. The connecting conductor device 8 is fastened to the load terminal 4 of the main circuit breaker 3 by screws 19 (FIG. 3) in which the main terminal portions 12a, 13a, 14a pass through the through holes 18 (FIG. 2).

On the other hand, bus bars 5, 6, which are arranged in a flat stack
The connecting terminals of No. 7 are sequentially elongated from the upper stage to the lower stage. The connecting terminals are guided into the through holes 15h, 15i, 15j and inserted into the insulating case 15 until their respective ends abut against the partition wall 15a. The connection portions 12b, 13b, and 14b of 12, 13, and 14 are overlaid. As a result, the connection positions of the bus bars 5, 6, and 7 with respect to the connection portions 12b, 13b, and 14b are automatically determined in the front-back and left-right directions, and then through the through holes of the bus bars 5, 6, and 7 and the connection portions 12b, 13b. , 14b are tightened with two screws 20 screwed into the screw holes of the connection conductor 1.
Connections between 2, 13, 14 and the bus bars 5, 6, 7 are made.

The insulating case 15 is fixed by mounting screws 22 (FIG. 1) screwed into the screw holes of the base 1 through a pair of right and left mounting holes 21 provided in the partition wall 15a. When it is desired to connect the main circuit of the main circuit breaker 3 to a circuit other than the bus bars 5, 6, 7, as shown in FIG.
c, 13c, and 14c, and the screw holes 23 (FIG. 4)
A connection conductor 25 of another circuit is connected by a screw 24 screwed into the connector. FIG. 1 shows a switchboard in which the main circuit breaker 3 and the bus bars 5, 6, 7 are thus connected by the connecting conductor device 8.

FIG. 8 is a left side view showing the inside of the branch circuit breaker 11 with the cover removed. Briefly describing this, the illustrated branch circuit breaker 11 is a ground fault circuit breaker in which two-pole switching units are accommodated within a common width of 25 mm, and these switching units sandwich a main body case 30 constituting a central partition wall. In the left pole in the figure, the current is fixed contact 31 → fixed contact 31a → movable contact 32a → movable contact 32 → lead wire 33 → bimetal 34a of overcurrent trip device 34 → zero phase current It flows along the path from the primary conductor 37 of the vessel 36 to the load-side terminal 38. The same applies to the right pole side not shown,
These conduction paths are covered by a pair of left and right covers (not shown) mounted on both sides of the main body case 30.

Here, the branch circuit breaker 11 has an Ω-shaped terminal plug 39 at the end on the power supply side. Terminal plug 39
Are attached to any two of the three upper and lower recesses of the main body case 30 (the uppermost part and the lowermost part in FIG. 8), and the terminal plug 39 on the upper side is fixed via a lead plate 40 on the left-hand side in the figure. The lower terminal plug 39 is also connected to a fixed contact on the right side (not shown). In addition,
In the middle recess where the terminal plug 39 is not mounted,
The insulating cap 41 is attached. As will be described later, the branch circuit breaker 11 shown in FIG. 8 is of a 200V type that is inserted between the R and T phases of the bus bars 5, 6, and 7, and is connected between the R and N phases or between the N and T phases. 10 plugged in
In the case of the 0V specification, the terminal plug 39 is mounted in the uppermost and middle concave portions or the middle and lowermost concave portions.
For the detailed configuration and operation of the branch circuit breaker 11, refer to the specifications of Japanese Patent Application Nos. 9-147345 and 10-076655.

The branch circuit breaker 11 is obliquely inserted into bus bars 5, 6, and 7 from the side as shown in FIG. 9, and the R-phase bus bar 5 and the T-phase bus bar 7 are respectively connected by terminal plugs 39 (FIG. 8). It is electrically connected to the other. At this time, the concave portion 30a of the main body case 30 is fitted to the fixing claw 42 made of a steel plate fixed to the mounting base 1, and then the mounting base 1
The movable breaker 43 made of a leaf spring fixed to the elastic member is elastically engaged with the concave portion 30b to fix the branch breaker 11 to the mounting base 1. As a result, the branch breaker 11 is inserted and connected between the R and T phases, that is, a 200 V circuit. Similarly, the branch circuit breaker 11 of 100V specification having the terminal plug 39 in the middle concave portion is inserted and connected between the R phase and the N phase or between the N phase and the T phase.

In the above embodiment, the connection conductor 1
2, 13 and 14 are housed and fixed in an insulating case 15, and a partition 15a is provided between the connecting portions 12b, 13b and 14b.
, The connection parts 12b, 13b, 1
4b can be brought close to the thickness dimension of the partition wall 15a. Therefore, the vertical dimension of the connecting conductor device 8 in FIG. 1 can be reduced, and the required space can be reduced accordingly. Further, since the phases of the connection conductors 12, 13, 14 and the bus bars 5, 6, 7 are completely separated by the partition walls 15a and 15g in the insulating case 15, a large insulation strength is obtained as a whole of the connection conductor device.

Further, the connecting conductor device 8 in which the connecting conductors 12, 13, and 14 are housed and fixed in the insulating case 15 is one in total.
Since the unit is integrated as one unit, handling during the connection operation is simple, while the bus bar 5
By simply inserting the connection terminals 6 and 7, the through holes 15h, 1
The positioning of the bus bars 5, 6, 7 with respect to the connection conductors 12, 13, 14 in the front-rear direction and the width direction is automatically performed by the connection portions 12b, 13b, and 5j.
14b is a bus bar 5 so that the phases do not overlap each other.
The connection terminals of the bus bars 5, 6, and 7 are arranged in a stepwise manner descending toward the connection terminals of the connection portions 6 and 7.
Since the screws 20 to be fastened to 2b, 13b, 14b are not hidden behind the connection conductors 12, 13, 14 and the bus bars 5, 6, 7, of the other phases, the workability of the conductor connection work is extremely good.

On the other hand, in general, in a distribution board, wiring may be connected from the secondary side of the main circuit breaker 3 to another circuit in addition to the bus bars 5, 6, and 7 for supplying power to the branch circuit breaker 11. In such a case, the distribution terminals 12c, 13c, 1
4c can be used to easily form the crossover wiring 25 (FIG. 1), and the distribution terminals 12c, 13c, 14c have the same height position as the main terminals 12a, 13a, 14a. The height can be adjusted to the same level as the load side terminal 4 of the main circuit breaker 3.

FIG. 6 shows an example in which the advantages of the connecting conductor device 8 integrated as a unit are utilized, and this is also connected to the bus bars 5, 6, 7 on the side opposite to the main circuit breaker. As in this example, the connection conductor device 8 is mounted upside down on the board surface, and the bus bars 5, 6 and 7 stacked in three stages are parallel in the width direction with the bus bars 5 ', 6' and 7 'in the same plane. By returning to the arrangement configuration, the circuit breaker 44 whose power supply side is not plugged in can be mixedly mounted in the same distribution board using the conventional general branch conductor 45.

FIG. 7 is a front view of a main portion of a distribution board showing a different embodiment of the present invention. In this embodiment, the center of the main circuit breaker 3 is shifted to the left side in FIG. 7 from the centers of the bus bars 5, 6, and 7, and the connection conductors 12, 13, and 14 of the connection conductor device 8 are connected.
Are all L-shaped in the same direction, and the other configurations are substantially the same as those in FIG. FIG.
In the above, the main circuit breaker 3 may be installed in a horizontal direction orthogonal to the bus bars 5, 6, and 7, and the connection conductors 12 and 13 may be linear.

[0027]

As described above, according to the present invention, the following effects can be obtained. (1) Since the connection conductor is housed in the insulating case, the interphase insulation is strengthened, and the phase distance between the connection conductor and the bus bar can be shortened, so that the required space is reduced and the distribution board can be downsized. I can do it. (2) Since the connecting conductors are housed and fixed in the insulating case from above, the connecting conductors of each phase are integrated as a single unit by the insulating case, and the handling is simplified. (3) The bus bar inserted from the through hole of the insulating case is overlapped with the connecting portion of the connecting conductor on the connecting conductor arranged stepwise while shifting the position so as to descend toward the connecting terminal of the bus bar, and the insulating case is formed. By tightening with screws from the upper surface opening, positioning between the connection conductor and the bus bar is easily performed, and since the connecting portions do not overlap with each other, the screw tightening work is facilitated. The man-hour can be significantly reduced. (4) Since the distribution terminal portion is formed integrally with the connection conductor, it is possible to easily carry out wiring from the secondary side of the main circuit breaker to a circuit different from the bus bar.

[Brief description of the drawings]

FIG. 1 is a front view of a main part inside a distribution board showing an embodiment of the present invention.

FIG. 2 is a plan view of the connection conductor device in FIG. 1;

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a perspective view of a connection conductor in FIG. 1;

FIG. 5 is a perspective view of an insulating case in FIG. 1;

FIG. 6 is a front view showing an example in which a connection conductor device is also connected to the busbar in FIG. 1 on the side opposite to the main circuit breaker.

FIG. 7 is a front view of a main part inside a distribution board showing a different embodiment of the present invention.

FIG. 8 is a side view of the branch circuit breaker in FIG. 1 with a cover removed.

FIG. 9 is a side view for explaining a method of attaching the branch circuit breaker of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mounting base 3 Main circuit breaker 4 Load side terminal 5 R-phase bus bar 6 N-phase bus bar 7 T-phase bus bar 8 Connection conductor device 9 Insulating bush 11 Branch circuit breaker 12 R-phase connection conductor 13 N-phase connection conductor 14 T-phase connection conductor 15 Insulation case 25 Connection conductor

Claims (4)

[Claims] A bus bar comprising a plurality of rectangular conductors is used to connect between a load-side terminal of a main circuit breaker and the bus bar in a distribution board which is arranged vertically one above the other with an interval therebetween. A connection conductor formed of a plate conductor having the same number of phases as the bus bar and having a main terminal portion screw-connected to the load-side terminal at one end and a connection portion screw-connected orthogonally to the bus bar at the other end. In the connection conductor device of the distribution board, the main terminal portions of each phase are arranged in a horizontal line in the same plane in accordance with the load side terminals of the main circuit breaker, while the connection portions are aligned with the bus bars, and The connecting conductors arranged in a stepwise manner descending toward the connection terminal side of the bus bar so as not to overlap with each other between the phases have partition walls that insulate between the phases and the phases of the bus bars, and in an insulating case having an open upper surface. Stowed from above Wherein the bus bar inserted from the through hole on the side surface of the insulating case is overlapped on the connection portion of the connection conductor, and is screwed from the upper surface opening of the insulating case with a screw. Connection conductor device. 2. A distribution terminal portion for connecting the main circuit breaker to another circuit other than the bus bar is formed integrally with each of the connection conductors, and these distribution terminal portions are formed on a side surface of the bus bar in the same plane. The connection conductor device for a distribution board according to claim 1, wherein the connection conductor device is arranged in a horizontal row in parallel with the power supply. 3. The power distribution device according to claim 2, wherein a main terminal portion and a connection portion of the connection conductor are provided in directions orthogonal to each other, and the distribution terminal portion is formed on an extension of the connection portion. Connection conductor device for the panel. 4. The connection conductor device for a distribution board according to claim 3, wherein the height position of the main terminal portion and the distribution terminal portion of the connection conductor is the same.