JP2014027709A - Distribution board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plug-in distribution board provided with current detection means in which replacement and installation can be performed easily when incorporation of a branch breaker having a different voltage and capacity or incorporation into an existing distribution board is performed, and a current value that flows through each load can be detected accurately.SOLUTION: In a distribution board in which a plurality of arranged bus bars is connected to a secondary side terminal of a main breaker, and a number of branch breakers is connected to the bus bars, at least one of the bus bars includes a branch bar that extends toward a primary side terminal of each of the branch breaker, and a notch is formed on each of the branch bars to prepare a current sensor insertion portion, and in the current sensor insertion portion, a pair of arm parts projects from one end of a substrate, and the end portion is opened inside the arm parts to prepare a wire insertion portion, and a current sensor in which a magnetic sensing element is mounted on each of the arm parts is fitted freely from the front.

Description

  The present invention relates to a distribution board provided with means for detecting a current value flowing to a load connected to each branch breaker.

  The distribution board as shown in Patent Document 1 has a large number of branch breakers connected to three bus bars connected to the secondary side of the main breaker, and the secondary side of each branch breaker is a load circuit. It is connected to the. When it is desired to monitor the load current, a current transformer (CT) is generally attached to each branch breaker to detect the current value flowing to the load, and a current transformer is provided on the secondary side of each branch breaker. Had been placed.

  However, in order to place each CT on the secondary side of the branch breaker, it is necessary for the customer to pass the wiring inside the CT, and there is a problem that the work of connecting to the load through the wiring one by one is troublesome. there were. Further, when the capacity of the branch breaker is increased, the electric wire connected to the secondary side becomes thicker. In this case, there is a problem that it is necessary to form a gap for the allowable bending of the electric wire.

  On the other hand, there is known a unit in which a unitized CT is incorporated on the primary side of a branch breaker, such as the distribution board described in Patent Document 2, but the branch breakers for 100V and 200V are the same. If the branch breakers with different capacities are placed in the same distribution board, it is difficult to replace the current transformer, so there is a problem that cannot be handled . In addition, in order to incorporate a unitized CT on the primary side of the branch breaker, it is necessary to install the branch breaker before connecting it to the bus bar, and when installing CT after installing the distribution board, There is a problem that it is necessary to remove the wiring of all the branch breakers and to insert the board after removing all the branch breakers, which takes time for assembling work.

JP-A-6-165320 JP 2008-136279 A

  Therefore, the object of the present invention is to solve the above-mentioned conventional problems, and can be easily replaced or installed when a branch breaker having a different voltage or capacity is incorporated or when it is incorporated into an existing distribution board. It is an object of the present invention to provide a distribution board provided with current detection means capable of accurately detecting the value of a current flowing through a load.

  The distribution board of the present invention made to solve the above problems is a distribution board in which a plurality of bus bars arranged side by side are connected to secondary terminals of the main breaker, and a number of branch breakers are connected to these bus bars. In the electrical panel, at least one of the bus bars has a branch bar extending toward the primary terminal of each branch breaker, and a notch is formed in each of the branch bars to form a current sensor insertion portion. A pair of arms are projected from one end of the board into the part, and the inside is used as a wire insertion part with an open end, and a current sensor equipped with a magnetic detection element is fitted into each of the pair of arms from the front It is characterized by being free.

  According to a second aspect of the present invention, in the distribution board according to the first aspect, a current sensor is inserted into a plurality of branch bars, and the current sensors are arranged in one row in the upper and lower directions.

  In the distribution board of the present invention, at least one of the bus bars has a branch bar extending toward the primary terminal of each branch breaker, and each of the branch bars is formed with a notch portion to insert the current sensor. A pair of arm portions projecting from one end of the substrate into the current sensor insertion portion to form a wiring insertion portion with the end portions open, and a magnetic detection element is mounted on each of the pair of arm portions Since the current sensor can be fitted from the front, it can be easily replaced and installed when installing a branch breaker with different voltage and capacity, or when installing it in an existing distribution board. It is possible to accurately detect the value of the current flowing through the.

  Moreover, since the notch part is formed and it is set as the current sensor insertion part, the space | interval of an adjacent current sensor can be narrowed and it can also achieve size reduction of a distribution board.

  Further, since a gap is formed between the bus bar and the branch breaker, the heat radiation area of the bus bar is increased, which is advantageous in terms of heat countermeasures.

  As in the second aspect of the present invention, the current sensor is inserted into a plurality of branch bars, and the current sensors are arranged in one row in the upper and lower directions, whereby the length of the branch bar in the left-right direction can be shortened. Therefore, the distribution board can be miniaturized.

It is a front view which shows the 1st Embodiment of this invention (state with which the current sensor was mounted | worn). It is a front view which shows the 1st Embodiment of this invention (state which is not mounting | wearing with the current sensor). It is a whole perspective view of a current sensor. It is a principal part front view which shows the modification of 1st Embodiment. (With current sensor attached) It is a principal part perspective view which shows 2nd Embodiment (state just before mounting | wearing of a current sensor). It is a bottom view which shows 2nd Embodiment (state which attached the current sensor).

Hereinafter, preferred embodiments of the present invention will be described.
1 and 2 are views showing a first embodiment of the present invention, in which 1 is a main breaker, 2 is a three bus bar connected to the secondary side via a lead bar 3, and 4 is a bus bar. A number of branch breakers arranged on both sides of the bar 2. These are housed in an electrical equipment storage box (not shown) to form a plug-in distribution board. In the present specification, the direction in which the main breaker 1 is located is referred to as “up”, both side directions of the bus bar 2 are referred to as “left and right”, and the stacking direction of the three bus bars 2 is referred to as “front-back direction”. In the present embodiment, the branch breaker 4 is described as a plug-in distribution board that can be plug-in connected to the bus bar 2. However, the bus bar 2 and the branch breaker 4 are screwed to form a circuit. A distribution board may be used.

  The bus bar 2 is stacked in the front-rear direction at a predetermined interval. In the present embodiment, the N pole, the L1 pole, and the L2 pole are sequentially arranged from the front direction. However, it is possible to freely combine the poles such as the N pole and the L2 pole, and the L1 pole and the L2 pole. In the present embodiment, each bus bar 2 has a shape in which a large number of branch bars 5 protrude in the left-right direction.

  As shown in FIG. 5, each branch bar 5 extends in the direction of the branch breaker 4, and the connecting portion at the tip of the branch bar 5 ensures the plug-in connection of the plug terminal portion 9 serving as the primary side terminal of the branch breaker 4. It is desirable to form a wide shape having the same width as the plug terminal portion 9 of the branch breaker 4.

  As shown in FIG. 2, the branch bar 5 is formed with a pair of notches 6. As shown in FIG. 1, a board-type current sensor 7 is disposed so as to straddle between the pair of cutout portions 6.

  In this way, by using the notch portion 6 formed in the branch bar 5 as a current sensor insertion portion, the current sensor 7 is arranged in a necessary place in a compact space without extending the distance between the branch bars 5. be able to. In addition, by forming the branch bar 5 in this way, a gap corresponding to the length of the branch bar 5 is formed between the bus bar 2 and the branch breaker 4. The heat radiation area of the bus bar 2 is increased by the air gap, which is advantageous for heat countermeasures.

  Here, when a current sensor such as a conventional CT is inserted into each branch breaker 4 in the branch bar 5, it is necessary to arrange them in a staggered manner depending on the size of the CT. Therefore, when arranging CT on the I straight line, it is necessary to reduce CT, but it is difficult to reduce the size in order to secure the winding inside CT. In general, CT is circular, and the inner diameter of CT needs to be larger than the end of the branch bar 5 to be inserted. Since the distance between the branch bars 5 is determined by the size of the branch breaker 4 to be used, it cannot be arranged in a line in the vertical direction in consideration of the number of windings of the CT. By using the current sensor 7 having a substantially U-shaped structure as in the present embodiment, it can be directly inserted into the cutout portion 6 of the branch bar 5 and a space is formed in the vertical direction. Regardless, it can be arranged in one line in the vertical direction. By arranging the current sensors 7 in a line, the length of the branch bar 5 in the left-right direction can be shortened, so that the distribution board itself can be reduced in size.

  As shown in FIG. 3, the current sensor 7 has a substantially U-shaped structure in which one end of a substrate 10 is opened to form a pair of arms 11, and a magnetic detection element 13 is mounted on the pair of arms 11. Yes. Further, a portion formed by opening one end of the substrate 10 is a wiring insertion portion 11a through which the wiring is inserted. The magnetic detection element 13 detects a magnetic field generated by the current flowing through the branch bar 5, and the substrate 10 is integrated to calculate the value of the current flowing through the connection terminal by processing the detection output of these magnetic detection elements 13. A circuit 12 is also mounted. In the present embodiment, one magnetic detection element 13 is mounted on each arm portion 11, but a plurality of magnetic detection elements 13 may be mounted. By mounting a plurality, it is possible to more accurately investigate the current flowing through the connection terminal.

  Since the current sensor 7 having the above structure can be freely attached / detached from the bus bar 2 side laminated at the foremost part, it can be replaced even when the branch breaker 4 having a different voltage or capacity is incorporated or when it is incorporated in an existing distribution board And can be installed easily.

  The width of the wire insertion portion 11a of the current sensor 7 is smaller than the width of the branch bar 5 and is substantially the same as or larger than the width of the notch 6 portion of the branch bar 5, and the current sensor 7 drops off from the branch bar 5. There is no. Further, if the positional relationship between the branch bar 5 and the magnetic detection element 13 is deviated, the current detection error is affected. Therefore, it is preferable that the current sensor 13 is arranged so as not to cause backlash. In the present embodiment, the width of the notch 6 formed in the branch bar 5 is substantially the same as the width of the current sensor 7 fitted in the notch 6 so that the current sensor 13 is rattled. It is possible to hold without generating. When a gap is generated between the current sensor 7 and the notch 6 when the current sensor 7 is fitted into the notch 6, a cover member 14 for covering the current sensor 7 is formed as shown in FIG. In addition, it is desirable to prevent rattling. Furthermore, the cover member 14 is formed with a clamping portion (not shown) that clamps the branch bar 5, so that it can be more firmly held.

  In the present embodiment, as shown in FIG. 1, the notch 6 is formed so that the vertical width of the current sensor fitted in the notch 6 is wider than the vertical width of the branch bar 5. As shown in FIG. 4, the vertical width of the current sensor fitted in the notch 6 can be formed to be substantially the same as the vertical width of the branch bar 5.

5 and 6 are views showing a second embodiment of the present invention.
In the second embodiment, all three bus bars 2 are provided with branch bars, but the branch bar 5 includes at least one of the three bus bars 2 stacked in the front-rear direction at a predetermined interval. What is necessary is just to provide in one bus-bar 2.

  This embodiment can be used, for example, when the 100V branch breaker and the 200V branch breaker are adjacent to each other. For example, the current can be detected by measuring the N pole for the 100V branch breaker and the L1 pole for the 200V branch breaker. In this case, it is necessary to provide branch bars in at least two of the bus bars 2 formed above and below.

  In the present embodiment, as shown in FIG. 6, since the notch portion 6 serving as the current sensor insertion portion is arranged at a position shifted to the left and right for each bus bar 2, the current sensor 7 is bulky in the front-rear direction. Even in the case of the type, the current sensor 7 can be incorporated in a plurality of stages before and after the distribution board is not enlarged.

1 Main breaker 2 Bus bar 3 Lead bar 4 Branch breaker 5 Branch bar
6 notch portion 7 current sensor 10 substrate 11 arm portion 11a wiring insertion portion 12 integrated circuit 13 magnetic detection element 14 cover member

Claims (2)

Connect multiple busbars formed side by side to the secondary terminal of the main breaker,
In a distribution board where many branch breakers are connected to these bus bars,
At least one of the bus bars has a branch bar extending toward the primary side terminal of each branch breaker, and in these branch bars, a notch portion is formed as a current sensor insertion portion,
A current sensor having a pair of arm portions projecting from one end of the substrate and having a wire insertion portion with the end portions open to the current sensor insertion portion, and a magnetic detection element mounted on each of the pair of arm portions. A distribution board characterized by being freely fitted from the front.   2. The distribution board according to claim 1, wherein current sensors are inserted into a plurality of branch bars, and the current sensors are arranged in one row in the upper and lower directions.