JP2007288963A - Plug-in power distribution board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plug-in power distribution board that is capable of performing three-phase four-wire wiring by using an inexpensively mass-produced plug-in three-pole breaker, in a three-phase four-wire plug-in power distribution board. <P>SOLUTION: The plug-in power distribution board performs the three-phase four-wire wiring composed of three bus bars 2 of a voltage pole and a bus bar 2 of a north pole by arranging an N-phase module 6 which is provided with a plug terminal metal fitting 61 connected to the bus bar 2 of the north pole adjacently to the three-pole breaker 5 provided with plug terminal metal fittings 51 connected to each of the three bus bars 2 of the voltage pole from a width direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a plug-in distribution board capable of performing three-phase four-wire wiring using a three-pole breaker in a three-phase four-wire plug-in distribution board.

  The three-phase four-wire distribution board is a two-pole or three-pole branch for any two or three of the four bus bars R, S, T, N connected to the main 4-pole breaker By connecting to the power supply side terminal of the breaker, it can be supplied to a load as a single-phase two-wire, single-phase three-wire, or three-phase three-wire power source (see Patent Document 1). However, when branching from the four bus bars of R, S, T, and N to another three-phase four-wire distribution board, it is common to use a four-pole breaker. In this case, when the distribution board on the sending side is a plug-in type, it is necessary to adopt a plug-in type 4-pole breaker for branching.

However, the 4-pole breakers are less expensive and more expensive than the 3-pole breakers, which are popular in Japan and have been mass-produced due to low demand. When such a four-pole breaker is a branch breaker, there is a problem that the distribution board is very expensive.
Japanese Laid-Open Patent Publication No. 4-58797 (refer to FIG. 1 in particular)

  The present invention solves the conventional problems as described above and uses a three-phase breaker with a three-pole breaker equipped with a plug-in terminal fitting that is mass-produced inexpensively in a three-phase four-wire distribution board. It is to provide a plug-in distribution board capable of wiring.

  The plug-in distribution board of the present invention has a plug terminal fitting connected to an N pole bus bar adjacent to a three pole breaker provided with a plug terminal fitting connected to the three bus bars of the voltage pole from the width direction. The basic invention is characterized by arranging the provided N-phase module and performing three-phase four-wire wiring composed of three bus bars of voltage poles and N-bar bus bars.

  In the present invention, each plug terminal fitting of the three-pole breaker and the plug terminal fitting of the N-phase module are provided on the respective bottom surfaces, and the N-pole bus bar is disposed outside the three bus bars of the voltage pole. It is preferable to correspond to the plug terminal fitting of the N-phase module. Also, the N-phase module is provided with a disconnect device operated by a handle, or the N-phase module is fixed to the inner rail of the plug-in distribution board, and the plug terminal fitting of the N-phase module is connected to the N pole bus bar. You may provide the elastic piece hold | maintained in the state which cancelled | released the connection.

  The plug-in distribution board of the present invention described above is a plug terminal connected to an N-pole bus bar adjacent to a 3-pole breaker provided with a plug terminal fitting connected to the three bus bars of the voltage pole from the width direction. Since an N-phase module with metal fittings is arranged, a 3-pole breaker with a blocking function that connects to the voltage pole and an N-phase module that does not particularly require a blocking function are combined as a 4-pole breaker. Therefore, branch wiring can be provided to other three-phase four-wire distribution boards so that the circuit can be cut off, and a three-pole breaker and N-phase module are used as a set. Can be used as a 4-pole main circuit breaker. Thus, the plug-in distribution board which can reduce a manufacturing cost can be provided by employ | adopting the breaker for 3 poles and N-phase module which can be mass-produced cheaply.

  In addition, each of the plug terminal fittings for the three-pole breaker and the plug terminal fitting for the N-phase module are provided on the bottom surface, and the N-pole bus bar is arranged outside the three bus bars of the voltage pole. If the plug terminal fittings of the module are made to correspond to each other, the connection work between the plug terminal fittings and the bus bar is easy, and the discrimination between the voltage pole bus bar and the N pole bus bar is easy.

  Further, a disconnecting device operated by a handle is provided on the N-phase module, or the plug terminal fitting of the N-phase module is connected to the N-phase module fixed to the internal rail of the plug-in distribution board from the N-pole bus bar. By providing an elastic piece that is held in a disconnected state, the circuit of the N-phase module can be cut off and the work can be performed safely during maintenance and inspection.

Next, a preferred first embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a cabinet of a plug-in distribution board. Four bus bars 2 of R, S, T, and N are arranged on a back plate 11 of the cabinet 1 so that the width direction thereof faces the opening of the cabinet 1. Are arranged parallel to each other. Among the bus bars 2, three bus bars 2 of voltage electrodes R, S, and T are first bar holders 12 a made of an insulating material attached to the front surface of a mounting bar 12 arranged at a distance from the back plate 11. It is supported by.

  A pair of internal rails 3 and 3 are disposed on both sides of the three bus bars 2 of R, S, and T. A second bar holder 12b attached to the attachment bar 12 is positioned outside one of the inner rails, and the N pole bus bar 2 which is a neutral pole is supported by the second bar holder 12b. It is assumed that they are arranged outside the three bus bars 2 of the voltage electrode. The arrangement of the bus bar 2 makes it easy to distinguish between the voltage pole bus bar 2 and the N pole bus bar 2. A second inner rail 3 a is provided outside the N-pole bus bar 2.

  Reference numeral 4 denotes a main four-pole breaker for supplying power to the four bus bars 2 of R, S, T, and N. The four-pole breaker 4 is installed on the upper portion of the back plate 11 and is connected to the load side. Four pole terminals are connected to each bus bar 2 via a connection bar 41. If the main 4-pole breaker is not necessary, there is no need to provide it, and an external lead-in wire may be directly connected to the bus bar 2.

  In FIG. 13, reference numeral 5 denotes a three-pole breaker, and the three-pole breaker 5 includes plug terminal fittings 51 that are connected to three bus bars of the voltage pole from the width direction. As shown in FIGS. 14 and 15, the three-pole breaker 5 has a screw-type three-pole breaker mounted on a plug-in adapter 50 having a clip-like plug terminal fitting 51 made of a spring plate on the bottom surface. The primary terminal of the screw-type three-pole breaker is electrically connected to the plug terminal fitting 51 by a connection bar, a covered electric wire or the like.

  Further, the bottom surface of the plug-in adapter 50 is provided with a sub-base 52 provided with a protective wall 52b for enclosing the plug terminal fitting 51 having a notch 52a in which the bus bar 2 can intervene as shown in FIGS. It is attached, and the operator does not touch the ring-shaped spring metal fitting 51a that strengthens the clamping force provided in the plug terminal metal fitting 51 to remove the spring metal fitting 51a. Of course, the three-pole breaker 5 may be of a plug-in type in which the plug terminal fitting 51 is directly provided on the bottom surface.

  The three-pole breaker 5 is connected to the plug terminal fitting 51 so that the three bus bars 2 of the voltage pole are sandwiched from the width direction, and the load-side terminal 5a is positioned on the side opposite to the N-pole bus bar 2. It is made to attach to the upper end of said pair of inner rails 3 and 3 by screwing.

  Reference numeral 6 denotes an N-phase module provided with a plug terminal fitting 61 which is arranged adjacent to the three-pole breaker 5 and to which the N-pole bus bar 2 is connected. The N-phase module 6 is provided with a plug terminal fitting 61 on the bottom surface corresponding to the N-pole bus bar 2 arranged outside the three bus bars 2 of the voltage pole. Then, the plug terminal fitting 61 provided on the bottom surface and the load side terminal 6a provided at a position corresponding to the load side terminal 5a of the three-pole breaker 5 are connected by a line in the case 60 of the N-phase module 6. Yes. Further, the case 60 may have a structure in which the bottom surface is opened and a hole for heat dissipation is provided on the top plate surface to release the heat generated by the bus bar 2.

  As described above, the plug terminal fitting 61 connected to the N pole bus bar 2 is provided adjacent to the three pole breaker 5 provided with the plug terminal fitting 51 connected to the three bus bars 2 of the voltage pole from the width direction. Since the N-phase module 6 is arranged, the three-pole breaker 5 having a blocking function for connecting to the voltage pole and the N-phase module 6 not particularly requiring a blocking function as a set are similar to the four-pole breaker. Therefore, as shown in FIG. 12, the maintenance and inspection can be performed by shutting off the circuit with the other three-phase four-wire plug-in distribution board (A) branched from now on. Is. Moreover, the plug-in distribution board which can reduce a manufacturing cost can be provided by employ | adopting the 3 pole breaker 5 and the N phase module 6 which can be mass-produced cheaply. Since the plug terminal fittings 51 of the three-pole breaker 5 and the plug terminal fittings 61 of the N-phase module 6 are provided on the respective bottom surfaces, the three-pole breaker 5 or the N-phase module 6 is connected to the inner rail 3, Since the plug terminal fitting 51 or the plug terminal fitting 61 is simultaneously connected to the bus bar 2 when being attached to 3 and 3a, the connection work is easy.

  Further, as a means for disconnecting the N-phase module 6 from the N-pole bus bar 2, a disconnecting device operated by the handle 7 may be provided in the N-phase module 6 as shown in FIG. It is good also as what can be opened and closed in conjunction with a link mechanism by the handle operation of the 3 pole breaker 5 used as a pair adjacent to the N-phase module 6. Further, in the N-phase module shown in FIGS. 2 to 10 in which no disconnecting device is provided between the plug terminal fitting 61 and the load side terminal 6b, the plug terminal fitting 61 of the N-phase module 6 is connected to the N pole bus. The connection with the bar 2 is released and disconnection from the bus bar is performed. In this case, as shown in FIGS. 7 to 10, the front end of the inner rails 3, 3 a is assumed to maintain the state in which the connection with the bus bar 2 is released without completely removing the N-phase module 6 from the inner rail 3. Are provided at both ends of the N-phase module 6 in the longitudinal direction. As a result, the circuit of the N-phase module 6 can be disconnected and can be safely operated during maintenance and inspection.

  As shown in FIG. 17, the N-pole bus bar 2 may be disposed at a position where the 3-pole breaker 5 and the load-side terminals 5a and 6a of the N-phase module 6 face. In this case, the N-phase module 6 Is provided with a plug-in terminal 61 on the bottom surface of the load side terminal 6a.

  Further, as shown in FIGS. 18 and 19, the N-pole bus bar 2 may be disposed between the voltage-pole bus bars 2, for example, between the R pole and the S pole. In this case, in order to ensure insulation between the voltage electrode and the N electrode, an insulation process such as providing an insulating wall is performed. Further, assuming that two N pole bus bars 2 are arranged between each of the three voltage poles, the load side terminals can be selected and arranged on the right side and the left side of the distribution board. Thereby, there exists an advantage that the width direction of a distribution board can be formed small.

The plug-in distribution board shown in FIG. 20 shows the second embodiment of the present invention, and the same parts as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.
In this embodiment, the 3-pole breaker 80 having a blocking function and the N-phase module 90 not having a blocking function function as a 4-pole main breaker as a set, and the branch wiring is connected 3 Arranged at the top of bus bar 2 in the same row as pole breaker 5 and N-phase module 6.

  The load side terminal 80a of the uppermost three-pole breaker 80 is connected to the bus bar 2 of the distribution board via the plug-in adapter 50, and a lead-in wiring from the outside of the distribution board is connected to the power supply side terminal 80b. It is connected. That is, the three-pole breaker 80 is attached to the plug-in adapter 50 in the opposite direction to the three-pole breaker 5 that performs branch wiring. The N-phase module 90 is exactly the same as the N-phase module 6 to which the branch wiring is connected, but the terminal portion 90b is connected to the lead-in wiring from the outside of the distribution board.

  In such a plug-in distribution board, a 4-pole breaker 80 as a main breaker is not provided, but a combination of a 3-pole breaker 80 having a blocking function and an N-phase module 90 having no blocking function is used. It functions as a pole main breaker, and further has the advantage that the manufacturing cost of the plug-in distribution board can be reduced.

  In any of the above-described embodiments, not only the three-phase four-wire wiring is performed on other distribution boards, but also a three-phase three-wire power supply can be supplied by a three-pole breaker as in the conventional case. In addition, as a matter of course, the two-pole breaker and the N-phase module can be used as a plug-in distribution board capable of supplying a single-phase three-wire power supply as a set.

It is a front view which shows the 1st Embodiment of this invention. The perspective view which shows the principal part of the 1st Embodiment of this invention. The perspective view shown from the reverse direction to FIG. The side view which shows the principal part of the 1st Embodiment of this invention. The side view shown from the reverse direction to FIG. The front view which shows the principal part of the 1st Embodiment of this invention. The side view which shows the state which cancelled | released the connection of the plug terminal metal fitting of an N phase module with the bus bar of N pole. The side view shown from the reverse direction to FIG. The perspective view which shows the state which cancelled | released the connection of the plug terminal metal fitting of an N phase module with the bus bar of N pole. The perspective view shown from the reverse direction to FIG. The perspective view using the N phase module which provided the disconnection device operated with a handle. A front view showing a state branched to another three-phase four-wire distribution board. The perspective view which shows the breaker for 3 poles used for embodiment of this invention. The perspective view shown from the bottom face side which shows the breaker for 3 poles used for embodiment of this invention. The perspective view which shows the breaker for 3 poles used for embodiment of this invention, and a sub base. The perspective view shown from the bottom face side which incorporated the sub base in the breaker for 3 poles. The perspective view which shows the state which has arrange | positioned the N pole bus-bar in the position which the breaker for 3 poles and the load side terminal of an N phase module face. The front view which shows embodiment which has arrange | positioned the N pole bus-bar between the bus | baths of a voltage pole. The perspective view which shows embodiment which has arrange | positioned the N pole bus-bar between the bus | baths of a voltage pole. It is a front view which shows the 2nd Embodiment of this invention.

Explanation of symbols

2 Busbar 3 Inner rail
3a Internal rail 5 3-pole breaker
51 Plug terminal bracket 6 N-phase module
61 Plug terminal bracket 7 Handle

Claims (4)

  An N-phase module provided with a plug terminal fitting connected to the N pole bus bar is arranged adjacent to a three pole breaker provided with a plug terminal fitting connected to the three bus bars of the voltage pole from the width direction, A plug-in distribution board comprising a three-phase four-wire system comprising three bus bars for voltage poles and a bus bar for N poles.   The plug terminal fittings of the three-pole breaker and the plug terminal fittings of the N-phase module are provided on the bottom surface, and the N-pole bus bar is arranged outside the three bus bars of the voltage pole. The plug-in distribution board according to claim 1, wherein the plug terminal fitting is made to correspond.   The plug-in distribution board according to claim 1 or 2, wherein a disconnecting device operated by a handle is provided in the N-phase module. The elastic piece which hold | maintains the plug terminal metal fitting of this N phase module in the state from which the connection from the N pole bus bar was cancelled | released in the N phase module fixed to the internal rail of a plug-in distribution board is provided. 2. Plug-in distribution board according to 2.

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