JP4942097B2 - 3-phase 4-wire distribution board - Google Patents

Description

  The present invention relates to a three-phase four-wire distribution board using a plug-in breaker provided with a groove into which a main bar is inserted at upper and lower three stages on one side end.

  The three-phase four-wire distribution board has a number of branch breakers connected to four main bars including one neutral phase and three voltage phases. However, there are few distribution boards of this type in Japan, and most are single-phase three-wire or three-phase three-wire distribution boards. For this reason, even when a plug-in breaker is used as a branch breaker, it is costly to produce a special plug-in breaker for a three-phase four-wire system with four grooves into which the main bar is inserted. It is preferable to be able to use a plug-in breaker provided with a groove into which a popular main bar is inserted at upper and lower three stages on one side end.

  Therefore, Patent Document 1 discloses that the upper main bar is divided into left and right parts to be voltage poles (first and second poles), the middle main bar is neutral, and the lower main bar is voltage pole (first). A three-phase four-wire distribution board with three poles) has been proposed. With such a structure, it is possible to use a general plug-in breaker having a groove into which the main bar is inserted in three upper and lower stages at one end as a branch breaker. Further, the vertical positions of the left and right ends of each main bar can be aligned, and branch breakers can be plug-in connected from both sides of the main bar as in the conventional case.

However, in the structure in which the upper main bar is divided into left and right in this way, the cross-sectional area of each of the divided upper main bars must be greater than or equal to the required minimum cross-sectional area for the current used by the distribution board, Therefore, the cross-sectional area of the middle and lower trunk bars becomes excessive, and there is a problem that the trunk bar material is wasted.
JP 2000-278821 A

  Therefore, the object of the present invention is to solve the above-mentioned conventional problems, and can use a plug-in breaker having a groove into which a main bar is inserted as upper and lower three stages on one side as a branch breaker. It is an object of the present invention to provide a three-phase four-wire distribution panel that does not waste the main bar material of a book.

The three-phase four-wire distribution board of the present invention, which has been made to solve the above problems, is provided with four plug-in breakers provided with three stages of upper and lower grooves on one side end into which a main bar is inserted. A three-phase four-wire distribution board connected to a number of main bars, with the upper and middle main bars made flat, and the lower main bar divided into left and right, each with an open end facing downward It has a substantially L shape, and the open end of the lower trunk bar is located below the lower surface of the plug-in breaker .

  It is preferable that the cross-sectional areas of the upper and middle main bars and the cross-sectional areas of the left and right main bars in the lower stage are substantially the same. Further, it is preferable that the vertical side portion of the lower trunk bar is a trunk bar mounting portion.

  According to the present invention, since the lower trunk bar is divided into left and right to form a substantially downward L shape, the sectional area of the divided lower trunk bar is increased by appropriately extending the downward vertical side portion. Can be made. For this reason, the cross-sectional areas of the upper and middle trunk bars may remain constant, and the trunk bar material is not wasted as in the prior art. Since the four main bars are arranged in three upper and lower stages, it is possible to use a general plug-in breaker having grooves into which the main bars are inserted in the upper and lower three stages on one side end.

  Also, the cabinet of the distribution board is usually determined according to the depth of the main breaker, and the branch breaker that is smaller than the main breaker is mounted at the position lifted by the mounting bracket, and the main breaker and the surface Match the height. For this reason, the lower part of the branch breaker has a sufficient space, and the open end of the lower trunk bar can be positioned below the lower surface of the plug-in breaker. Therefore, a sufficient cross-sectional area can be secured without complicating the shape of the lower trunk bar.

Preferred embodiments of the present invention are shown below.
FIG. 1 is a plan view showing an embodiment of a three-phase four-wire distribution board according to the present invention, FIG. 2 is a vertical sectional view, and FIG. 3 is a perspective view. In this specification, assuming that the distribution board is installed horizontally, the door side is described as “up”. However, when the distribution board is installed vertically, the vertical direction is horizontal. Needless to say.

  In these drawings, 1 is an upper trunk bar, 2 is a middle trunk bar, and 3 and 4 are lower trunk bars. These main bars usually use copper plates. The upper and middle trunk bars 1 and 2 have a flat plate shape, while the lower trunk bars 3 and 4 are divided into left and right, and each has a substantially L-shape. The vertical side 8 of each main bar 3, 4 extends downward toward the open end. These main bars 1, 2, 3, 4 are arranged at equal intervals. The horizontal planes of the lower main bars 3 and 4 are at the same height. Further, the left and right ends of each of the main bars 1, 2, 3, 4 are in the same position in the vertical direction, and branch breakers can be plug-in connected from both sides as in the conventional case.

  Reference numeral 5 denotes a plug-in breaker provided with grooves 6 into which the main bars 1 to 4 are inserted at upper and lower three stages on one side end. A large number of plug-in breakers 5 are arranged opposite to each other on both sides of the main bars 1 to 4 as shown. Each plug-in breaker 5 is provided with three upper and lower grooves 6 into which the main bar is inserted, but the plug-in terminals are provided so that the position of the plug-in terminals can be changed to two of them, and either of the two main stages is provided. Plugged into the bar selectively. As described above, since the cabinet of the distribution board is determined according to the depth of a large main breaker (not shown), the plug-in breaker 5 which is a branch breaker smaller than the main breaker is provided with the mounting bracket 7. Is attached to a position lifted from the base 10.

  As described above, in the three-phase four-wire distribution board of the present invention, since the lower main bars 3 and 4 are divided into left and right, the horizontal width of each horizontal plane portion becomes narrow. However, in the present invention, the lower trunk bars 3 and 4 are substantially L-shaped downward, so that by extending the vertical side 8 downward, the cross-sectional area of the upper and middle trunk bars 1 and 2 and the lower left and right The cross-sectional areas of the main bars 3 and 4 can be made substantially the same. Therefore, the main trunk bars 3 and 4 in the lower stage do not need a complicated shape, and a cross-sectional area necessary for energization can be secured.

  In this embodiment, the open end of the lower end of the vertical side 8 of the lower main trunk bars 3 and 4 extends further downward than the lower surface of the plug-in breaker 5. However, this portion is an intermediate portion between the left and right mounting brackets 7 and 7, and there is a sufficient space, so there is no problem. In this embodiment, the vertical sides 8 and 8 of the lower main trunk bars 3 and 4 are used as main bar attachment portions, and a base 10 is sandwiched by a T-shaped attachment member 9 made of an insulating resin material or the like. It is fixed to. The upper and middle main bars 1 and 2 are fixed above the base 10 by a mounting member (not shown) as in the prior art.

  Since the three-phase four-wire distribution board of the present invention configured as described above can use the plug-in breaker 5 provided with the upper and lower three stages of the groove on which one side end is inserted, the cost can be reduced. You can go down. Further, the cross-sectional areas of the four main bars 1 to 4 can be made substantially the same, so that the main main bar material is not wasted. The lower main bars 3 and 4 have the same shape if they are reversed, so the same parts can be used, and the number of parts can be reduced, and the upper and middle main bars 1 and 2 are bent. If the lower main bars 3 and 4 are processed, the factory parts inventory can be further reduced.

  As described above, the plug-in terminals 11 of these plug-in breakers 5 are provided in two stages of the three-stage grooves 6, and the main bar to be connected is selected by changing the position of the plug-in terminal 11. can do. FIG. 4 is an explanatory diagram illustrating the situation. In consideration of safety, the upper main bar 1 is an N pole, the middle main bar 2 is an L1 pole, the lower main bars 3 and 4 are an L2 and an L3 pole. This is an example. In FIG. 4, six plug-in breakers 5 are set as one set, and the connection destinations are distributed to the L1, P2, and L3 poles.

  That is, the plug breaker 5 on the left side of the upper stage in FIG. 4 is connected to the N pole and L1 pole, and the plug breaker 5 on the right side of the upper stage is also connected to the N pole and L1 pole. The plug breaker 5 on the left side of the middle stage is connected to the N pole and the L2 pole, the plug breaker 5 on the right side of the middle stage is connected to the N pole and the L3 pole, and the plug breaker 5 on the left side of the lower stage is the N pole and the L2 pole. The inbreaker 5 is connected to the N pole and the L3 pole. This arrangement is preferable because two plug-in breakers 5 are evenly connected to each voltage electrode, and a balance between the electrodes can be achieved.

It is a top view which shows embodiment of this invention. It is sectional drawing of the up-down direction which shows embodiment of this invention. It is a perspective view which shows embodiment of this invention. It is a connection relation figure of a main bar and a plug-in breaker.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper trunk bar 2 Middle trunk bar 3 Lower trunk bar 4 Lower trunk bar 5 Plug-in breaker 6 Groove 7 Mounting bracket 8 Vertical side 9 Mounting member 10 Base 11 Plug-in terminal

Claims (3)

A three-phase four-wire distribution board in which a number of plug-in breakers equipped with three upper and lower grooves for inserting a main bar are connected to four main bars. The main bar has a flat plate shape, and the lower main bar is divided into left and right parts, each of which has a substantially L shape with an open end facing downward,
A three-phase four-wire distribution board characterized in that the open end of the lower trunk bar is positioned below the lower surface of the plug-in breaker .   The three-phase four-wire distribution board according to claim 1, wherein the cross-sectional areas of the upper and middle main bars and the cross-sectional areas of the left and right main bars are substantially the same. The three-phase four-wire distribution board according to claim 1, wherein a vertical side portion of the lower main bar is a main bar mounting portion.

Images