JP2000278821A - Distribution switchboard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To compose a distribution switchboard that can cope with a three- phase four-wire system circuit by using a branch breaker for single-phase three wires. SOLUTION: Bussbars 2-5 are flatly stacked in three stages, the bussbars 2 and 3 are provided in an upper stage, the bussbars of the upper stage and the bussbars 2, 3, and 5 of a lower stage are connected to the voltage phase (R, S, and T phases) of a three-phase four-wire circuit, and a bussbar 4 of a middle stage is connected to a neutral phase (N phase). A branch breaker 8 is arranged at both the sides of the bussbars 2-5, and is inserted into the bussbars 2-5 via a terminal plug being provided at two of three recessed parts being provided above and below the power-supply-side end part for connecting. The part between the R and S-N and the N-T phases and the part between the R and S-T phases are set to a 100 V circuit and a 200 V circuit, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distribution board equipped with a circuit breaker, such as a wiring breaker or a leakage breaker, having a relatively small current capacity for the purpose of protecting end loads, as a branch breaker. In particular, it relates to the arrangement of the bus bar.

[0002]

2. Description of the Related Art The inventors of the present application disclose a small distribution board to which two rows of the above-mentioned branch circuit breakers can be plugged in and a branch circuit breaker to be used therewith, in particular, a contracted one-pole size / two-pole circuit breaker. A branch circuit breaker suitable as a circuit breaker was developed, and a patent application was previously filed (Japanese Patent Application No. 10-076655). The distribution board and the branch circuit breaker according to this application are intended for a single-phase three-wire circuit. The distribution board has bus bars connecting the main circuit breaker and the branch circuit breaker in three stages through insulating bushes. The circuit breakers are arranged in a flat stack, and the power supply side terminal is connected to any two of the three-stage busbars.

[0003]

On the other hand, as a power distribution system, there is a three-phase four-wire system having one neutral phase and three voltage phases. A branch circuit is formed by extracting two wires from this distribution line. Distribution boards are also widely used. Therefore, an object of the present invention is to configure a distribution board capable of supporting a three-phase four-wire circuit by directly using the branch circuit breaker according to the above patent application.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a distribution board in which bus bars made of a rectangular conductor for connecting a main circuit breaker and a branch circuit breaker are arranged vertically in three stages. In the above, at least one of the three stages is provided with two left and right bus bars separated from each other in parallel (claim 1). In that case, the two busbars are provided in the upper stage, any one of the voltage phases of the three-phase four-wire circuit is connected to both of them and the lower busbar, and the neutral phase is connected to the busbar in the middle stage. (Claim 2).

[0005] The terminal of the bus bar on the side opposite to the main circuit breaker is held by an insulating terminal holding block, and the terminal holding block is provided with bag-shaped recesses for inserting the terminal of the bus bar at three upper and lower positions. It is preferable that abutment fitting surfaces corresponding to a plurality of types of widths of the bus bar are formed in a symmetrical step shape in an inner deep portion of the concave portion. In this case, a convex adjustment piece can be fitted into one of the abutting fitting surfaces, and abutting fitting surfaces of the two bus bars can be formed on both sides thereof (claim 4).

[0006]

1A and 1B show an embodiment of the present invention. FIG. 1A is a front view of a main part of a distribution board, and FIG. 1B is a bottom view thereof. In FIG. 1, reference numeral 1 denotes a four-pole main circuit breaker corresponding to a three-phase four-wire type distribution line. The left three poles in FIG. 1A are connected to three-phase voltage lines (R, S, and T phases). The right one pole is connected to the neutral line (N phase). Below the main circuit breaker 1,
Busbars 2 to 5 made of rectangular conductors are arranged vertically in three layers via insulating bushes (not shown), and two busbars 2 and 3 separated from each other are provided in parallel in the upper layer. The terminals on the main circuit breaker side (upper side in FIG. 1A) of the bus bars 2 to 5 are sequentially elongated stepwise from the upper stage to the lower stage, and the bus bars 2, 3, 4 and 5
These terminals are connected to the R, S, T and N-phase terminals of the main circuit breaker 1 via the relay cables 6 by screwing. On the other hand, the terminals of the busbars 2 to 5 on the side opposite to the main circuit breaker (lower side in FIG. 1A) are held by a terminal holding block 7 having a configuration described later.

A plurality of branch circuit breakers 8 are arranged on both sides of the bus bars 2 to 5, respectively, and these branch circuit breakers 8 are connected to the bus bar 2 through plug terminals vertically arranged at the power supply side end. 5 is plugged in. The branch circuit breaker 8 has a configuration according to Japanese Patent Application No. 10-076655, in which plug terminals are mounted in any two of the upper and lower three concave portions on the power supply side end. It is divided into correspondence. That is, the one with the terminal plug mounted on the top and the bottom of the recess is configured for 200 V, and the one with the terminal plug mounted on the top and the middle or the middle and the bottom is 100 V. It is configured as a correspondence (for details of this configuration, refer to the specification of the above-mentioned application).

On the other hand, in the bus arrangement of the bus bars 2 to 5 in FIG. 1, the bus bar 2, 3 (R, S phase) -bus bar 4 (N phase)
And between bus bar 4 (N phase) and bus bar 5 (T phase)
0V, the bus bar 2, 3 (R, S phase)-bus bar 5 (T
200V between the two phases. Therefore, under the arrangement of the bus bars 2 to 5 in FIG. 1, the branch circuit breaker 8 having the above configuration is inserted and connected as shown in the drawing, so that the branch circuit breaker 8 has 100 V and 200 V depending on the terminal plug arrangement described above. A branch circuit is freely formed. In this case, the branch circuit breaker 8 used for the single-phase three-wire distribution board is used without any modification. In FIG. 1, the two busbars 2 and 3 are arranged in the upper stage, but they can be arranged in the lower stage, and it is reasonable that the middle stage is the neutral phase (N phase). However, the arrangement of the voltage phases (R, S, T phases) with respect to the upper and lower stages is, in principle, free.

FIG. 2 is a partially broken perspective view showing the terminal holding block 7. The terminal holding block 7 is a box-shaped body formed from an insulating resin as shown in the figure, and bag-shaped concave portions 9 for inserting the terminals of the bus bar are provided at three upper and lower positions corresponding to the vertical interval of the bus bar. Mounting pieces having mounting holes on the left and right side surfaces are integrally formed. Abutment fitting surfaces 9a corresponding to the widths of a plurality of types (four types in the drawing) of the bus bar are formed in a symmetrical step shape in the inner depth of the concave portion 9.

FIG. 3 shows a state in which the terminals of the bus bars 2 to 5 in FIG. 1 are held by the terminal holding block 7.
A convex adjustment piece 10 made of an insulating plate is fitted into the bushing, and two bus bars 2 and 3 are fitted and held on narrow butting fitting surfaces 9b formed on both sides thereof. The busbars 4 and 5 are inserted into the middle and lower recesses 9, and are fitted and held on the abutting fitting surfaces 9 a having the corresponding widths.

FIG. 4 shows a higher rating than in FIG.
That is, this embodiment shows an embodiment in which the bus bars 2 to 5 are wide, and only the adjustment piece 10 is replaced as shown in FIG.
Can be commonly used for a plurality of types (four types in the figure). The terminal holding block 7 is also applicable to a three-wire system, and FIG. 5 shows a usage example in that case.
In FIG. 5, bus bars 11 to 13 having the same width are used, and no adjustment piece is required.

The present invention is mainly directed to a three-phase four-wire distribution line. In this case, two bus bars are provided in any one of three upper and lower stages. In the distribution board, all three stages are respectively constituted by two bus bars, and it is effective to increase the current capacity of each stage by setting the two bus bars in phase. By the way, it is difficult to handle a wide busbar conductor for large current, but if the busbar of each phase is divided into two and two narrow conductors are arranged in each stage, a narrow conductor can be used. The current capacity can be easily increased.

[0013]

As described above, according to the present invention, the single phase 3
A three-phase four-wire distribution board can be easily configured using a plug-in branch circuit breaker for wires, and the bus bar current capacity can be easily increased even in a single-phase three-wire distribution board. Can be.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, in which (A) is a front view of a main part of a distribution board, and (B) is a bottom view thereof.

FIG. 2 is a perspective view of a terminal holding block in FIG.

FIG. 3 is a perspective view showing a state where a bus bar is inserted into the terminal holding block of FIG. 2;

4A and 4B show a state in which a busbar having a large rating is inserted into the terminal holding block of FIG. 2; FIG. 4A is a front view of a main part of a distribution board, and FIG.

FIG. 5 shows a state in which the terminal holding block of FIG. 2 is used for a single-phase three-wire bus bar, and FIG.
(B) is a bottom view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main circuit breaker 2 Bus bar 3 Bus bar 4 Bus bar 5 Bus bar 6 Relay cable 7 Terminal holding block 8 Branch circuit breaker 9 Concave 9a Butt fitting surface 10 Adjustment piece 11 Bus bar 12 Bus bar 13 Bus bar

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroaki Takenouchi 4-7-45 Kami Shokakuji, Hirano-ku, Osaka City Seiritsu Kogyo Co., Ltd. F-term (reference) 5G016 AA03 DA04 DA05 DA26 5G365 AA01 AC03 AD06

Claims (4)

[Claims] 1. A distribution board in which bus bars made of a rectangular conductor for connecting a main circuit breaker and a branch circuit breaker are vertically stacked in three stages, wherein at least one of the three stages has left and right separated from each other. A distribution board characterized in that the bus bars are provided in parallel. 2. The two bus bars are provided in an upper stage, and any one of the voltage phases of a three-phase four-wire circuit is connected to both of them and the lower bus bar, respectively, and a neutral phase is similarly applied to the middle bus bar. The distribution board according to claim 1, wherein the distribution board is connected. 3. The terminal of the bus bar on the side opposite to the main circuit breaker is held by an insulating terminal holding block, and the terminal holding block has bag-shaped recesses into which the terminal of the bus bar is inserted at three upper and lower positions. The distribution board according to claim 1 or 2, wherein abutment fitting surfaces corresponding to a plurality of types of widths of the bus bar are formed in a symmetrical stair-like shape inside the recess. . 4. A projection adjusting piece is fitted into one of said abutting fitting surfaces, and abutting fitting surfaces of said two bus bars are formed on both sides thereof.
Distribution board described.