JP6256838B2 - Cabinet for distribution board with measuring instrument and distribution board - Google Patents

Description

  The present invention generally relates to a cabinet for a distribution board with a measuring instrument and a distribution board, and more particularly to a cabinet for a distribution board with a measuring instrument including a conductive bar, and a distribution board using the same.

  Conventionally, a distribution board including a main breaker and a plurality of branch breakers is widely known (see, for example, Patent Document 1). The distribution board described in Patent Document 1 includes a current measuring device (current sensor unit) that detects a branch current flowing in a branch circuit, and a measurement control unit that outputs a signal based on data detected by the current measuring device. ing.

  This distribution board includes three conductive bars (main bars) that are electrically connected to the main breaker. These conductive bars are held on the base table, and the branch breaker is electrically connected to the conductive bars. Here, among the three conductive bars, the conductive bars of the voltage phase (L1, L2) are a flat plate (flat plate portion) and a plurality of connection terminals that are bent at a right angle from the flat plate and further bent at their tips at a right angle. (Branch bar). The plurality of connection terminals are arranged in the longitudinal direction of the conductive bar, and a branch breaker is connected to each of the plurality of connection terminals.

  The current measuring instrument has a detector (current sensor) that detects a current flowing through the connection terminal. The detection unit is a Rogowski type air core current transformer formed around the insertion hole of the printed circuit board through which the connection terminal passes. Thereby, the current measuring device can detect the current flowing through each branch breaker.

JP 2008-136283 A

  However, in the conventional distribution board as described above, since the total current flowing through the plurality of branch breakers passes through the flat plate of the conductive bar, the current flowing through the flat plate increases as the number of branch circuits increases, and the current flows around the flat plate. The strength of the generated magnetic field increases and this magnetic field may act on the current measuring instrument. In this case, the current measuring instrument may be affected by the magnetic field in detection by the detection unit.

  The present invention has been made in view of the above reasons, and a distribution board cabinet with a measuring instrument in which a magnetic field generated when a current flows through a conductive bar hardly acts on a current measuring instrument, and a distribution board using the same. The purpose is to provide.

  A distribution board cabinet with a measuring instrument of the present invention includes a cabinet main body, a conductive bar fixed to the cabinet main body and forming a power path from the main breaker to a plurality of branch breakers, and a current measuring instrument for measuring current. And the conductive bar has a flat plate arranged along the front surface of the cabinet body, and a plurality of connection terminals provided at one end portion in the short direction of the flat plate and arranged in the longitudinal direction of the flat plate. The main breaker can be electrically connected to one end of the flat plate in the longitudinal direction, and each of the plurality of branch breakers can be electrically connected to each of the plurality of connection terminals. The current measuring device is configured to measure a current flowing through each of the plurality of connection terminals based on magnetic flux, and between the flat plate and the current measuring device, from the flat plate to the current measuring device. Wherein the magnetic shield to reduce the magnetic flux directed to the flow meter is provided.

  According to the present invention, the magnetic shield for reducing the magnetic flux from the flat plate to the current measuring device is provided between the flat plate of the conductive bar and the current measuring device. Therefore, even when the current flowing through the flat plate increases and the strength of the magnetic field generated around the flat plate increases, the magnetic field is shielded by the magnetic shield, and the influence of the magnetic field on the current measuring instrument can be suppressed. As a result, there is an advantage that a magnetic field generated when a current flows through the conductive bar hardly acts on the current measuring instrument.

It is a perspective view which shows the principal part of the cabinet for distribution boards with a measuring device which concerns on Embodiment 1. FIG. It is a front view which shows the electricity distribution panel which concerns on Embodiment 1. FIG. It is a perspective view which shows the principal part of the cabinet for distribution boards with a measuring device which concerns on Embodiment 1. FIG. FIG. 3 is an exploded perspective view illustrating a main part of the distribution board according to the first embodiment. It is sectional drawing which shows the principal part of the electricity distribution panel which concerns on Embodiment 1. FIG.

(Embodiment 1)
As shown in FIGS. 2 and 3, the distribution board cabinet 10 with a measuring instrument according to the present embodiment includes a cabinet body 11, conductive bars 41, 42, and 43, and a current measuring instrument 5 that measures current. I have. The conductive bars 41, 42, 43 are fixed to the cabinet body 11, and form a power path from the main breaker 2 to the plurality of branch breakers 3, 3,. Hereinafter, “distribution panel cabinet with measuring instrument” is simply referred to as “distribution panel cabinet”.

  Here, since a single-phase three-wire system is assumed as the power distribution method, the conductive bars 41, 42, and 43 include the conductive bar 41 of the first voltage pole (L1 phase) and the second voltage pole (L2 phase). ) Conductive bar 42 and neutral electrode (N-phase) conductive bar 43 in total. Hereinafter, among the three conductive bars 41, 42, 43, the conductive bars 41, 42 of the first and second voltage electrodes of interest are particularly referred to as “conductive bars”, and the neutral conductive bar 43 is referred to as “neutral pole”. Sometimes referred to as “bar”.

  As shown in FIG. 1, the conductive bar 41 of the first voltage electrode is provided on a flat plate 412 arranged along the front surface of the cabinet body 11 and one end of the flat plate 412 in the short direction, and the longitudinal direction of the flat plate 412. And a plurality of connection terminals 411, 411,. The main breaker 2 can be electrically connected to one end of the flat plate 412 in the longitudinal direction, and each of the plurality of branch breakers 3, 3... Is electrically connected to each of the plurality of connection terminals 411, 411. Is possible.

  Similarly to the first voltage electrode conductive bar 41, the second voltage electrode conductive bar 42 is also provided on the flat plate 422 disposed along the front surface of the cabinet body 11 and one end of the flat plate 422 in the short direction. And a plurality of connection terminals 421, 421,... Arranged in the longitudinal direction of the flat plate 422. The main breaker 2 can be electrically connected to one end of the flat plate 422 in the longitudinal direction, and each of the plurality of branch breakers 3, 3... Is electrically connected to each of the plurality of connection terminals 421, 421. Is possible.

  The current measuring device 5 is configured to measure the current flowing through each of the plurality of connection terminals 411, 411,... (421, 421,...) Based on the magnetic flux. Here, a magnetic shield 9 is provided between the flat plate 412 (422) and the current measuring device 5 to reduce the magnetic flux from the flat plate 412 (422) toward the current measuring device 5.

  In other words, the distribution board cabinet 10 according to the present embodiment has a current from the flat plate 412 (422) by the magnetic shield 9 provided between the flat plate 412 (422) of the conductive bar 41 (42) and the current measuring instrument 5. It is comprised so that the magnetic flux which goes to the measuring device 5 may be reduced. Therefore, even when the current flowing through the flat plate 412 (422) increases and the strength of the magnetic field generated around the flat plate 412 (422) increases, the distribution board cabinet 10 shields the magnetic field by the magnetic shield 9. The influence of the magnetic field on the current measuring instrument 5 can be suppressed. Therefore, according to the distribution board cabinet 10, there is an advantage that a magnetic field generated when a current flows through the conductive bar 41 (42) hardly acts on the current measuring instrument 5.

  Hereinafter, the distribution board cabinet 10 according to the present embodiment and the distribution board 1 using the same will be described in detail. However, the configuration described below is only an example of the present invention, and the present invention is not limited to the following embodiment, and the technical idea according to the present invention is not deviated from this embodiment. Various changes can be made in accordance with the design or the like as long as they are not.

  In the present embodiment, the case where the power customer (customer's facility) on which the distribution board 1 is installed is a detached house, but the present invention is not limited to this example. Each dwelling unit, office, store, factory, etc. may be used. In the following, the top, bottom, left and right (up, down, left, and right in FIG. 2) when the distribution board 1 is attached to the wall are defined as top, bottom, left and right, and the direction perpendicular to the wall (the direction perpendicular to the sheet of FIG. However, it is not intended to limit the direction in which the distribution board 1 is attached.

<Basic configuration>
As shown in FIG. 2, the distribution board 1 according to the present embodiment includes a distribution board cabinet 10 and a distribution board inner unit (hereinafter simply referred to as “inner unit”) attached to the distribution board cabinet 10. ). The internal unit includes at least a main breaker 2 and a plurality of branch breakers 3, 3..., And in this embodiment, a current measuring device 5 (see FIG. 3), a measuring unit 6, a first communication adapter 71, a second communication. An adapter 72, a third communication adapter 73, and a secondary interconnection breaker 8 are included. In addition to the internal unit shown in FIG. 2, distribution cabinet 10 has a space for mounting an internal unit such as a primary interconnection breaker (not shown).

  First, the basic configuration of the distribution board cabinet 10 will be described.

  As shown in FIG. 2, the distribution board cabinet 10 is formed in a box shape in which the front view is a horizontally long rectangular shape and the front surface is open, and includes a cabinet body 11 that is used by being attached to a wall of a house. ing. Here, the cabinet body 11 is attached with an outer lid (not shown) that can be opened and closed between a position where the front opening is closed and a position where the opening is opened.

  Further, an inner lid (not shown) is attached to the inside of the outer lid of the cabinet body 11 so as to close the opening on the front surface of the cabinet body 11. The inner lid is formed with a window hole (not shown) for exposing at least a part of the main breaker 2 and the plurality of branch breakers 3, 3. FIG. 2 shows the distribution board 1 with the outer lid and the inner lid removed. Each of the outer lid and the inner lid may be included in the distribution board cabinet 10 or may not be included in the distribution board cabinet 10.

  The cabinet body 11 includes a frame 110 made of a synthetic resin and formed in a rectangular frame shape, and crosspieces 111 to 114 that are spanned between both sides of the opening of the frame 110 in the vertical direction. Yes. These four crosspieces 111 to 114 are arranged in the order of crosspieces 111, 112, 113, and 114 in order from the right side, and the crosspiece 112 and the crosspiece 113 are integrally formed. In this configuration, the cabinet body 11 is formed with a hole penetrating in the front-rear direction by an opening of the frame 110 in the rear wall, and wiring can be drawn into the interior from the back through this hole.

  Further, the cabinet body 11 includes a support plate 12 and a base 13 (see FIG. 3) that are attached across a pair of crosspieces 111 and 112. The support plate 12 is made of a magnetic material such as tin (tin-plated iron). The support plate 12 is fixed by screwing both ends in the left-right direction to the pair of crosspieces 111 and 112. The base table 13 is made of, for example, a nonmagnetic material such as synthetic resin, and is attached to the front surface that is one surface in the thickness direction of the support plate 12. Note that the support plate 12 is not limited to tinplate, and may be configured using, for example, a galvanized steel plate (SGCC).

  The cabinet body 11 has a space for mounting various internal devices such as a breaker. In the present embodiment, the cabinet body 11 includes a first space between the pair of crosspieces 112 and 113 in which the main breaker 2 is disposed. Further, the cabinet body 11 includes a second space in which the plurality of branch breakers 3, 3... Are arranged and a third space in which the current measuring device 5 is arranged in the base table 13.

  Here, the first space is provided at a position closer to the left and lower than the center of the front surface of the cabinet body 11. The cabinet body 11 secures sufficient space above, below, to the left, and to the right of the first space. The second space and the third space are provided on the right side of the first space. As will be described in detail later, the plurality of branch breakers 3, 3... Are divided into an upper side and a lower side of the neutral pole bar 43, and a plurality (11 in the example of FIG. 2) are arranged in the horizontal direction. Is done. Therefore, the second space for attaching the plurality of branch breakers 3, 3... Is provided on the right side of the first space in the cabinet body 11 and on the upper side and the lower side of the neutral electrode bar 43, respectively. . A third space for mounting the current measuring instrument 5 is provided behind the neutral electrode bar 43.

  The cabinet body 11 includes a fourth space between a pair of crosspieces 113 and 114 in which a primary interconnection breaker (not shown) described later is disposed. Moreover, the cabinet main body 11 is provided with the 5th space where the measurement unit 6 mentioned later is arrange | positioned under the 1st space. Furthermore, the cabinet body 11 includes a sixth space on the left side of the crosspiece 114 in which a first communication adapter 71, a second communication adapter 72, and a third communication adapter 73, which will be described later, are arranged.

  As described above, the distribution board cabinet 10 of the present embodiment is provided with the third to sixth spaces in the cabinet body 11, so that various internal devices other than the main breaker 2 and the plurality of branch breakers 3, 3. Additional attachment (retrofit) is possible. However, the cabinet body 11 only needs to have a first space to which the main breaker 2 is attached and a second space to which the plurality of branch breakers 3, 3. May be.

  By the way, as shown in FIG. 3, the distribution board cabinet 10 includes a first voltage electrode conductive bar 41, a second voltage electrode conductive bar 42, and a neutral electrode conductive bar (neutral electrode bar) 43. Is further provided. These three conductive bars 41, 42, and 43 are fixed to the cabinet body 11 by being attached to the base table 13, respectively.

  More specifically, the base 13 includes a back plate 131 attached to the support plate 12, and a pair of support columns 132 and 132 (the right support column is protruded forward from both left and right ends of the front surface of the back plate 131). 4). The pair of struts 132 and 132 are disposed at the center in the vertical direction on the front surface of the back plate 131.

  Furthermore, as shown in FIG. 4, the base table 13 has a partition wall 133 protruding forward from a center line along the left-right direction of the front surface of the back plate 131 and a space between the pair of columns 132, 132 in the left-right direction. A plurality of partitions 134, 134... Partitioning at equal intervals. In the present embodiment, the base table 13 is configured to be divided into a plurality (four in this case) in the left-right direction. However, the configuration is not limited to this configuration, and the base table 13 may be integrally formed.

  The neutral pole bar 43 is an electrically conductive metal plate and is formed in a long plate shape that is long in the left-right direction, and is arranged at each end in the left-right direction so as to be bridged between the pair of columns 132, 132. Are fixed to the front end portion (front end portion) of the support column 132. Here, the protruding height of the partition wall 133 from the front surface of the back plate 131 is lower than that of the support columns 132 and 132 and the partitions 134, 134..., And a gap is formed between the neutral electrode bar 43 and the partition wall 133. The

  The conductive bar 41 of the first voltage electrode is formed of a conductive metal plate, and is attached to a region above the partition wall 133 on the front surface of the back plate 131. The conductive bar 41 is in the shape of a long plate that is long in the left-right direction and is disposed along the front surface of the back plate 131 (first) flat plate 412 and protrudes forward from the lower end edge of the flat plate 412 (first And a protruding piece 413.

  Here, the protruding piece 413 is formed so as to rise forward from the flat plate 412 along the partition wall 133 between the pair of support columns 132 and 132, and is divided into a plurality of parts by a plurality of partitions 134, 134. Has been. In other words, the projecting pieces 413, 413... Divided into a plurality are arranged between adjacent struts 132 and partitions 134 or between a pair of adjacent partitions 134 and 134.

  The tip of each protruding piece 413 is divided into two forks, one being a first connecting terminal 411 protruding upward and the other being a second connecting terminal 411 protruding downward. The connection terminal 411 that protrudes downward is located in front of the connection terminal 411 that protrudes upward, and protrudes to the lower side of the partition wall 133 through the gap between the partition wall 133 and the neutral electrode bar 43.

  The conductive bar 42 of the second voltage electrode adopts a shape that is substantially symmetrical to the conductive bar 41 of the first voltage electrode with respect to the partition wall 133, and the basic configuration is the conductive bar of the first voltage electrode. 41. That is, the conductive bar 42 of the second voltage electrode is formed of a conductive metal plate, and is attached to a region below the partition wall 133 on the front surface of the back plate 131. The conductive bar 42 has a long plate shape that is long in the left-right direction and is disposed along the front surface of the back plate 131 (second) flat plate 422, and projects forward from the upper end edge of the flat plate 422 (second second). And a protruding piece 423.

  The protruding piece 423 is divided into a plurality of pieces by a plurality of partitions 134, 134. The tip of each protruding piece 423 is divided into two forks. One is a (third) connecting terminal 421 protruding downward, and the other is a (fourth) connecting terminal 421 protruding upward. The connection terminal 421 protruding upward is located in front of the connection terminal 421 protruding downward, and protrudes above the partition wall 133 through the gap between the partition wall 133 and the neutral electrode bar 43.

  The flat plate 422 is formed with an attachment hole 424 for fixing the conductive bar 42 to the base table 13 (see FIG. 1). Similarly, attachment holes are formed in the flat plate 412 in the conductive bar 41, but the illustration of the attachment holes of the conductive bar 41 is omitted. A plurality of mounting holes 424 are formed side by side along the longitudinal direction of the flat plate 412 (422). The conductive bar 41 (42) is fixed to the base table 13 when the mounting claws 135 are caught in the state in which the mounting claws 135 of the base table 13 are inserted into the respective mounting holes 424.

  With the above-described configuration, as shown in FIG. 5, on the upper side of the partition wall 133, the three conductive bars 41, 42, 43 are electrically connected to the neutral bar 43, conductive from the front side (opposite to the wall) in the front-rear direction. The bars (connection terminals 421) 42 and the conductive bars (connection terminals 411) 41 are arranged in this order. On the lower side of the partition wall 133, the three conductive bars 41, 42, 43 are arranged in the front-rear direction from the front side (the side opposite to the wall) to the neutral electrode bar 43, the conductive bar (connection terminal 411) 41, the conductive bar. (Connection terminal 421) 42 are arranged in this order.

  The conductive bar 41 only needs to have a plurality of connection terminals 411, 411,... Arranged in the longitudinal direction of the conductive bar 41 at one end portion in the short direction of the conductive bar 41. 411 ... need not be separated (divided) from each other. That is, it is not essential that one end portion in the short direction of the conductive bar 41 is branched into a plurality of connection terminals 411, 411,... Arranged in the longitudinal direction of the conductive bar 41, and the connection to which the branch breaker 3 is connected. There may be a plurality of terminals 411. The same applies to the plurality of connection terminals 421, 421,.

  In the present embodiment, the conductive bar 41 (42) has a protruding piece 413 (423) protruding forward from one edge of the flat plate 412 (422) in the short direction, and a plurality of connection terminals 411, 411,. (421, 421...) Are extended from the tip of the protruding piece 413 (423). In other words, the plurality of connection terminals 411, 411... (421, 421.

  Next, an internal unit of the distribution board 1 (an internal unit that can be attached to the cabinet body 11) will be described.

  The main breaker 2 is electrically connected to a primary side terminal 21 of a single-phase three-wire lead-in line of a system power supply (commercial power supply). The above-mentioned three conductive bars 41, 42, 43 are electrically connected to the secondary side terminal (not shown) of the main breaker 2. The main breaker 2 is configured to be switchable between an on state in which power from a system power source connected to the primary side is supplied to the secondary side and an open state in which the supply of the power is cut off.

  The plurality of branch breakers 3, 3... Are divided into an upper side and a lower side of the partition wall 133 on the front surface of the base table 13 of the cabinet body 11, and are arranged so as to be arranged in the left-right direction. Each branch breaker 3 has a primary side terminal 32 (see FIG. 5) and a secondary side terminal (not shown), and the primary side terminal 32 is electrically connected to the conductive bars 41, 42, 43. Each of a plurality of electric circuits (not shown) is connected to the secondary side terminal. Each branch breaker 3 is formed in a contracted dimension. Here, the agreement type dimension means a dimension (and shape) of a circuit breaker for a light distribution board in accordance with “JIS C 8201-2-1”.

  Each of the plurality of branch breakers 3, 3... Is disposed between adjacent struts 132 and partitions 134 or between a pair of adjacent partitions 134 and 134. In other words, each branch breaker 3 is attached to each space partitioned by the partitions 134, 134... In the left-right direction.

  Connected to the electrical circuit connected to the secondary terminal of each branch breaker 3, for example, one or more devices such as lighting fixtures and hot water supply facilities, outlets of plug connection devices, and wiring fixtures such as wall switches are connected as loads. And constitutes a branch circuit. In other words, each of the branch breakers 3, 3... Is electrically connected to the branch circuit, and switches between a power-on state in which power from the main breaker 2 is supplied to each branch circuit and an open state in which the power supply is cut off. It is configured to be possible.

  Each branch breaker 3 has an insertion port 31 (see FIG. 5) into which each conductive bar 41, 42, 43 is inserted on the surface facing the partition wall 133. Three insertion ports 31 are provided in each branch breaker 3 in the front-rear direction. The primary side terminal 32 is provided so as to be exposed in two of the three insertion ports 31, 31, 31. Thereby, in the state where each branch breaker 3 is attached to the cabinet body 11, each conductive bar 41, 42, 43 is inserted into the insertion port 31, and the primary side is inserted into any one of the pair of conductive bars 41, 42, 43. Terminal 32 is electrically connected. The connection terminal 411 is inserted into the insertion port 31 corresponding to the conductive bar 41, and the connection terminal 421 is inserted into the insertion port 31 corresponding to the conductive bar 42.

  A branch breaker (hereinafter also referred to as a “100 V branch breaker”) 3 connected to the first voltage electrode or the second voltage electrode and the neutral electrode has three primary terminals 32 and 32 plugged in. Of the ports 31, 31, 31, it is provided so as to be exposed in the two insertion ports 31, 31 at both ends. As a result, the 100 V branch breaker 3 is electrically connected to the first voltage electrode and the neutral electrode and attached to the lower side of the partition wall 133 when attached to the upper side of the partition wall 133. Then, the second voltage electrode and the neutral electrode are electrically connected.

  Further, a branch breaker (hereinafter also referred to as a “200 V branch breaker”) 3 connected to the first voltage electrode and the second voltage electrode has three primary terminals 32, 32 having three insertion ports 31, 31 and 31 are provided so as to be exposed in the two rear insertion ports 31 and 31. Thereby, the 200 V branch breaker 3 is electrically connected to the first voltage electrode and the second voltage electrode, regardless of whether the 200 V branch breaker 3 is attached to the upper side or the lower side of the partition wall 133.

  The current measuring device 5 is a sensor for detecting the power consumption of a load (electric circuit) connected to each of the plurality of branch breakers 3, 3. Here, a pair of current measuring devices 5 are provided, and are attached to the upper side and the lower side of the partition wall 133 as shown in FIG.

  The current measuring device 5 attached to the upper side of the partition wall 133 is attached to the plurality of connection terminals 411, 411, and the plurality of connection terminals 421, 421, and measures the value of the current flowing through each of the connection terminals 411, 411,. . This current measuring instrument 5 includes a branch breaker 3 attached on the upper side of the partition wall 133, for example, a 100V branch breaker 3 connected between a first voltage electrode and a neutral electrode, or a first voltage electrode-second voltage. The value of the current flowing through the 200V branch breaker 3 connected between the electrodes is measured. FIG. 3 shows a state where the current measuring instrument 5 is attached and the branch breaker 3 is removed.

  The current measuring instrument 5 attached to the lower side of the partition wall 133 is attached to the plurality of connection terminals 411, 411, and the plurality of connection terminals 421, 421, and measures the value of the current flowing through each of the connection terminals 421, 421,. To do. This current measuring instrument 5 includes a branch breaker 3 attached to the lower side of the partition wall 133, for example, a 100V branch breaker 3 connected between the second voltage electrode and the neutral electrode, or a first voltage electrode-second electrode. The value of the current flowing through the 200 V branch breaker 3 connected between the voltage electrodes is measured.

  Next, a specific configuration of the current measuring instrument 5 will be described with reference to FIGS. 3 and 4. The current measuring instrument 5 includes a substrate 501 (see FIG. 4) and a case 502 that accommodates the substrate 501. In FIG. 4, the current measuring instrument 5 is illustrated with the case 502 omitted and the substrate 501 exposed.

  A plurality of current sensors 503, 503... Are mounted on the substrate 501. The plurality of current sensors 503, 503,... Are configured to measure the value of the current flowing through each of the plurality of branch breakers 3, 3,. In the current measuring instrument 5, through holes 504, 504... Penetrating the substrate 501 and the case 502 in the thickness direction of the substrate 501 are formed at positions corresponding to the connection terminal 411 and the connection terminal 421, respectively. As a result, the current measuring instrument 5 has a plurality of connection terminals 411, 411, and a plurality of connection terminals 421, 421,. It will be attached to the connection terminals 421, 421. In this state, the connection terminals 411 of the first voltage electrode conductive bar 41 and the connection terminals 421 of the second voltage electrode conductive bar 42 pass through the through holes 504, 504,. Thus, the branch breaker 3 is connected.

  In the current measuring instrument 5, current sensors 503 are formed around the respective through holes 504 in the substrate 501. Each current sensor 503 is a sensor such as a current transformer (current transformer), a Hall element, a magnetoresistive element, a GMR (Giant Magnetic Resistances) element, or a shunt resistance. As an example, each current sensor 503 is a Rogowski coil that includes an air core coil that does not use a core (coreless), and generates an output corresponding to a current passing through the through hole 504. The current measuring device 5 calculates the value of the current flowing through each of the plurality of branch breakers 3, 3... Based on the output of each current sensor 503. The value of the current flowing through each of the plurality of branch breakers 3, 3... Is the same as the value of the current flowing through each of the plurality of electric circuits connected to the plurality of branch breakers 3, 3..

  However, the current sensor 503 does not have to be provided around all the through holes 504, 504, and in this embodiment, the rear side (wall side) of the pair of through holes 504, 504 arranged in the front-rear direction. It is provided only around the through hole 504. That is, in the present embodiment, the rectangularly shaped through hole 504 and the circularly shaped through hole 504 are formed side by side in the front-rear direction, and of these, the circular shape that is the rear side (wall side) The current sensor 503 is provided only around the through hole 504. Thus, the current sensor 503 measures the current value of the first voltage electrode when the current measuring instrument 5 is attached to the upper side of the partition wall 133, and the second voltage electrode when the current sensor 5 is attached to the lower side of the partition wall 133. The current value is measured.

  In the present embodiment, the through holes 504 are formed so as to open in a circular shape or a rectangular shape in a plane orthogonal to the thickness direction of the substrate 501, but the present invention is not limited to these shapes. That is, each through-hole 504 is only required to penetrate in the thickness direction of the substrate 501, and the opening shape in a plane orthogonal to the thickness direction may be a shape other than a circle or a rectangle. The shape opened in one direction as shown in FIG.

  Further, in the present embodiment, the current measuring instrument 5 has a computing device 505 on the substrate 501 that calculates the instantaneous power of each of the plurality of electric paths using the output of each current sensor 503. The arithmetic device 505 acquires voltage information indicating the value of the line voltage of each of the plurality of electric circuits from the measurement unit 6, and based on the current value obtained from the output of each current sensor 503 and the voltage information, the instantaneous power Is obtained as power information of the branch circuit. The current measuring instrument 5 is electrically connected to the first communication adapter 71 via the measurement unit 6 and transmits the power information of the branch circuit to the first communication adapter 71 via the measurement unit 6.

  The measurement unit 6 is electrically connected to the above-described three conductive bars 41, 42, and 43, receives electric power from the conductive bars 41, 42, and 43, and receives the electric current from the current measuring instrument 5 and the first communication adapter 71. Including a power supply circuit (not shown) for generating power for operating the internal unit. Further, the measuring unit 6 has a function of measuring the voltage between the conductive bars 41, 42, 43 and outputting the measured voltage value to the current measuring instrument 5 as voltage information.

  Further, the measurement unit 6 is configured to measure electric power for a specific circuit other than the branch circuit that is a measurement target in the current measuring instrument 5. Specifically, the measurement unit 6 is electrically connected to a current sensor (not shown) made of a current transformer (CT), and measures the value of the current passing through the main breaker 2, for example, by this current sensor. And the measurement unit 6 is comprised so that the value of instantaneous electric power may be calculated | required as electric power information of a specific circuit based on the value of the measured electric current, and voltage information. The measurement unit 6 is electrically connected to the first communication adapter 71 and transmits power information of the specific circuit to the first communication adapter 71.

  The current measuring instrument 5 and the measuring unit 6 are configured to obtain power information in the present embodiment, but the present invention is not limited to this example, and at least the value of the current flowing in each electric circuit (branch circuit or specific circuit). Any configuration can be used. For example, the current measuring instrument 5 and the measuring unit 6 may be configured to transmit the measured current value to the first communication adapter 71.

  The first communication adapter 71 has a communication function with a controller (not shown) that controls a device (not shown). The device here is a device compatible with HEMS (Home Energy Management System). The HEMS-compatible device only needs to be a management target of power consumption, for example, eight devices important in HEMS (smart meter, solar power generation device, power storage device, fuel cell, electric vehicle, air conditioner, lighting fixture, hot water supply device), etc. including. Further, the HEMS compatible device may include the other two of the four large power consumption sources, a refrigerator, a television receiver, and the like. However, the purpose is not to limit the HEMS compatible devices to these devices.

  The first communication adapter 71 is configured to receive the branch circuit power information from the current measuring instrument 5 and the specific circuit power information from the measurement unit 6. The first communication adapter 71 has a function of collecting instantaneous power data of each of the plurality of electric circuits by acquiring the power information. Further, the first communication adapter 71 may have a function of calculating the amount of power obtained by integrating the instantaneous power over a predetermined time for each of the plurality of electric circuits.

  The first communication adapter 71 transmits the power information (instantaneous power or power amount) to the controller. The controller is configured to control the device using the power information (HEMS compatible). Thereby, the controller can control an apparatus based on the power consumption in each of several electric circuit.

  Here, the controller is a HEMS controller. The HEMS controller has a function of visualizing (visualizing) power information by controlling a display terminal (not shown) and controlling a device (compatible with HEMS) based on the power information. It is installed outside the electrical panel 1. According to this controller, it becomes possible to manage the state of power consumption in the device, and wasteful consumption of power can be suppressed.

  The controller is installed in the house, and communicates with the first communication adapter 71 by, for example, wireless communication using radio waves as a medium, or wired communication such as a wired LAN (Local Area Network), or in-home (HEMS compatible) equipment. To control. The controller is connected to a network (not shown) such as the Internet, and communicates with the first communication adapter 71 by communication via the network, or controls home (HEMS compatible) devices. There may be.

  The first communication adapter 71 may have a function corresponding to the controller described above. Thereby, the 1st communication adapter 71 can control an apparatus based on the power consumption in each of a some electric circuit.

  The second communication adapter 72 has a function of communicating with a power meter (not shown) having a communication function. The second communication adapter 72 is mechanically coupled to and electrically connected to the first communication adapter 71. In the present embodiment, the first communication adapter 71 and the second communication adapter 72 are connected by a board-to-board connection with a part of each of the first communication adapter 71 and the second communication adapter 72 overlapping in the front-rear direction. Therefore, a part of the sixth space to which the first communication adapter 71 is attached also serves as an attachment space for the second communication adapter 72.

  The power meter here is a so-called smart meter, which measures the amount of power used by consumers and enables remote meter reading by communicating with a concentrator (not shown) connected to the distribution line. To do. Furthermore, request information, which is a request for suppressing power consumption, may be transmitted from a power company that is a supply company or a server operated by a power saving company to each customer's power meter. . The power meter can send a measured value (power consumption), request information, and the like to the second communication adapter 72 through communication with the second communication adapter 72.

  The 3rd communication adapter 73 is a communication function with the energy management apparatus (not shown) which consists of at least 1 of the power converter electrically connected to a gas meter, a water meter, a solar power generation device, an electrical storage device, and an electric vehicle. have. The power conversion device here refers to both power conversion for performing unidirectional charging from the distribution board 1 side to the electric vehicle, as well as both charging and discharging of the storage battery of the electric vehicle by performing bidirectional power conversion. The structure used for may be sufficient. However, the power conversion device may be configured to transfer power to and from the storage battery, and may be configured to perform only one of charging and discharging of the storage battery.

  The third communication adapter 73 is mechanically coupled to and electrically connected to the first communication adapter 71. In this embodiment, the 1st communication adapter 71 and the 3rd communication adapter 73 are connected by the board-to-board connection in the state in which each part overlapped in the front-back direction. Therefore, a part of the sixth space in which the first communication adapter 71 is attached also serves as an attachment space for the third communication adapter 73.

  The communication method between the first communication adapter 71 and the controller may be wireless communication using radio waves such as 920 MHz band specific low power radio, Zigbee (registered trademark), Bluetooth (registered trademark), or the like. Further, the communication method between the first communication adapter 71 and the controller may be wired communication such as a wired LAN. In addition, as a communication protocol in communication between the first communication adapter 71 and the controller, for example, Ethernet (registered trademark), ECHONET (registered trademark) Lite, or the like may be used. Note that wired communication includes power line communication (PLC) that performs communication using a power line as a transmission medium.

  Similarly, an appropriate method can be applied to the communication method between the second communication adapter 72 and the power meter regardless of wireless communication or wired communication. Further, as a communication method between the third communication adapter 73 and the energy management device, an appropriate method can be applied regardless of wireless communication or wired communication.

  Further, the primary interconnection breaker (not shown) is electrically connected to the primary side terminal 21 of the main breaker 2 and is electrically connected to a distributed power source (not shown) that allows reverse power flow to the power system. Connected to. As this type of distributed power source, for example, there is a solar power generation device. In addition, so-called creation cooperation, where the solar power generation device and the power storage device are integrated to store the generated power of the solar cell in the storage battery and supply the power of the storage battery to the device connected to the distribution board 1. The system may be connected to the primary interconnection breaker as a distributed power source.

  The primary interconnection breaker is electrically connected between the primary side of the main breaker 2 and the distributed power source. As a result, the primary grid breaker disconnects (disconnects) the distributed power source from the power system, for example, when the power supply from the system power source stops or when an abnormality occurs in the system power source or the distributed power source. Operate. The primary interconnection breaker has a primary side terminal (not shown) and a secondary side terminal (not shown), and the primary side terminal is electrically connected to the primary side terminal 21 of the main breaker 2, A distributed power source is connected to the secondary terminal. The primary interconnection breaker is 3P3E (number of poles 3, number of elements 3), and the dimension in the left-right direction is a size corresponding to a plurality of (three) branch breakers 3.

  The secondary interconnection breaker 8 is electrically connected to the conductive bars 41, 42, and 43, and is electrically connected to a distributed power source (not shown) that is not allowed to flow backward to the power system. Examples of this type of distributed power source include a fuel cell, a gas power generation device, and a power storage device. The secondary interconnection breaker 8 is electrically connected between the secondary side terminal of the main breaker 2 and the distributed power supply. Thereby, the secondary interconnection breaker 8 disconnects (disconnects) the distributed power source from the power system, for example, when the power supply from the system power source is stopped or when an abnormality occurs in the system power source or the distributed power source. To work.

  Similar to the branch breaker 3, the secondary interconnection breaker 8 has a primary side terminal (not shown) and a secondary side terminal 81, and the primary side terminal is electrically connected to the conductive bars 41, 42, 43. The distributed power source is connected to the secondary side terminal 81. The secondary interconnection breaker 8 is a breaker having 3P3E (number of poles 3, number of elements 3) and having a size in the left-right direction corresponding to a plurality of (three) branch breakers 3. In the example of FIG. 2, the secondary interconnection breaker 8 is replaced with the third branch breakers 3, 3, 3 from the right among the plurality of branch breakers 3, 3. And attached to the cabinet body 11. That is, the secondary interconnection breaker 8 is attached to a part of the second space below the partition wall 133.

<Feature configuration>
The cabinet 10 for the distribution board according to the present embodiment includes a first voltage electrode and a first voltage electrode among the first voltage electrode conductive bar 41, the second voltage electrode conductive bar 42, and the neutral electrode conductive bar 43. The configuration described below is adopted for the conductive bars 41 and 42 of the two voltage electrodes. The first voltage electrode conductive bar 41 and the second voltage electrode conductive bar 42 have the same basic configuration and adopt a shape that is substantially symmetrical in the vertical direction. Therefore, in the following description, the conductive bar 41 and the conductive bar 42 will be described by paying attention to the conductive bar 42 of the second voltage electrode, but unless otherwise specified, the configuration of the conductive bar 42 of the second voltage electrode is the first. This is also common to the conductive bar 41 of the voltage electrode.

  As shown in FIG. 1, the conductive bar 42 has a magnetic shield 9 attached to the front surface of a flat plate 422. The magnetic shield 9 is provided between the flat plate 422 and the current measuring instrument 5 when the current measuring instrument 5 is attached to the cabinet body 11. Here, the magnetic shield 9 is made of a magnetic material, and functions as a shield that reduces (shields) the magnetic flux from the flat plate 422 toward the current measuring device 5 by absorbing the magnetic flux.

  That is, a magnetic material such as a ferromagnetic material has a significantly higher magnetic permeability than a nonmagnetic material. Therefore, by forming a magnetic circuit through which the magnetic flux generated around the flat plate 422 passes by the magnetic shield 9, the magnetic flux is magnetically shielded. 9 can absorb. In other words, the magnetic flux is guided so as to pass through the magnetic shield 9, and the magnetic shield 9 can reduce the magnetic flux passing from the flat plate 422 to the current measuring instrument 5 beyond the magnetic shield 9.

  Specifically, the magnetic shield 9 is made of a ferromagnetic material such as tin (tin-plated iron), for example, and is formed in a sheet shape having a thickness dimension of about 0.1 to 0.3 mm as an example. The magnetic shield 9 is disposed so as to overlap one surface (front surface) on the connection terminal 421 side in the thickness direction (front-rear direction) of the flat plate 422, and is attached to the base table 13 together with the conductive bar 42. Therefore, a fixing hole 91 is formed in the magnetic shield 9 at a position corresponding to the mounting hole 424 of the conductive bar 42. The magnetic shield 9 and the conductive bar 42 are fixed to the base table 13 with the mounting claws 135 (see FIG. 4) of the base table 13 (see FIG. 4) inserted into the mounting holes 424 and the fixing holes 91, respectively. .

  The magnetic shield 9 is formed to have the same size as the flat plate 422 in the short direction (vertical direction) of the flat plate 422 and smaller (shorter) than the flat plate 422 in the long direction (left / right direction) of the flat plate 422. Has been. The magnetic shield 9 is disposed so as to cover a surface (front surface) of the flat plate 422 facing the current measuring instrument 5 except for both ends in the longitudinal direction of the flat plate 422.

  In the example of FIG. 1, the magnetic shield 9 is provided only in a portion of the conductive bar 42 where the branch breaker 3 is attached in the longitudinal direction of the flat plate 422. In other words, the magnetic shield 9 is attached to the conductive bar 42 with a space for attaching the secondary interconnection breaker 8 among the conductive bars 42, that is, with a space for three branch breakers 3 from the right. Furthermore, a connection hole 425 for connecting a secondary side terminal of the main breaker 2 is formed at an end of the main plate breaker 2 side (left side) in the longitudinal direction of the flat plate 422, and the magnetic shield 9 is connected to the connection hole. The periphery of 425 is also open and attached to the conductive bar 42.

  In addition, since the conductive bar 41 of the first voltage electrode and the conductive bar 42 of the second voltage electrode adopt a shape that is substantially symmetrical in the vertical direction as described above, the conductive bar 41 is Although the bottom is reversed, the basic configuration is common to the conductive bar 42.

  That is, the conductive bar 41 has the magnetic shield 9 attached to the front surface of the flat plate 412. The magnetic shield 9 is provided between the flat plate 412 and the current measuring instrument 5 when the current measuring instrument 5 is attached to the cabinet body 11. Here, the magnetic shield 9 is formed of a magnetic material, and functions as a shield that reduces (shields) the magnetic flux from the flat plate 412 toward the current measuring device 5 by absorbing the magnetic flux. The magnetic shield 9 and the conductive bar 41 are in the state that the mounting claws 135 (see FIG. 4) of the base 13 (see FIG. 4) are inserted into the mounting holes (not shown) and the fixing holes 91, respectively. Fixed to the base 13.

  In this embodiment, the conductivity of the magnetic shield 9 is lower than the conductivity of the conductive bar 41 (42). Specifically, the magnetic shield 9 is configured using a material having a higher electrical resistivity than the metal material that forms the conductive bar 41 (42).

  Further, in the present embodiment, an insulating member 92 (see FIG. 5) for electrically insulating the magnetic shield 9 and the conductive bar 41 (42) is provided between the magnetic shield 9 and the conductive bar 41 (42). It has been. The insulating member 92 is an insulating sheet formed into a sheet shape from a material having electrical insulation, for example. The insulating member 92 and the magnetic shield 9 are disposed on the front surface of the conductive bar 41 (42) so that the insulating member 92 is sandwiched between the magnetic shield 9 and the conductive bar 41 (42). Are stacked in this order. The insulating member 92 is not limited to the insulating sheet, and may be, for example, insulating plating formed on the front surface of the conductive bar 41 (42) or insulating plating formed on the back surface of the magnetic shield 9.

  The magnetic shield 9 is provided between the flat plate 412 (422) and the current measuring device 5, and has a function of reducing (shielding) the magnetic flux from the flat plate 412 (422) toward the current measuring device 5. For example, a plating layer formed on the front surface of the conductive bar 41 (42) may be used. In addition, the magnetic shield 9 may be fixed to the conductive bar 41 (42). In this case, the magnetic shield 9 is fixed to the flat plate 412 (422) by an appropriate method such as sticking with an adhesive or screwing. .

<Effect>
According to the distribution board cabinet 10 of the present embodiment described above, the magnetic shield 9 is provided between the flat plate 412 (422) and the current measuring device 5, and from the flat plate 412 (422) to the current measuring device 5. It functions as a shield that reduces (shields) the magnetic flux toward it. Therefore, according to the distribution board cabinet 10, there is an advantage that a magnetic field generated when a current flows through the conductive bar 41 (42) hardly acts on the current measuring instrument 5.

  In short, the magnetic shield 9 reduces (shields) the magnetic flux between the flat plate 412 (422) of the conductive bar 41 (42), which is a magnetic field generation source, and the current measuring device 5. For this reason, even if the number of branch circuits increases and the current flowing through the flat plate 412 (422) increases and the strength of the magnetic field generated around the flat plate 412 (422) increases, this magnetic field acts on the current measuring instrument 5. It becomes difficult. Therefore, the current measuring instrument 5 becomes less susceptible to the influence of the external magnetic field when measuring the current flowing through each of the plurality of connection terminals 411, 411... (421, 421...), And the measurement accuracy is improved.

  Moreover, it is preferable that the magnetic shield 9 is arrange | positioned so that the opposing surface with the electric current measuring device 5 in the flat plate 412 (422) may be covered like this embodiment. According to this configuration, since the magnetic shield 9 is provided in the vicinity of the conductive bar 41 (42) that is a magnetic field generation source, the magnetic field generated by the conductive bar 41 (42) is efficiently shielded to measure current. The magnetic flux acting on the vessel 5 can be reduced efficiently.

  Furthermore, as in the present embodiment, the conductivity of the magnetic shield 9 is preferably lower than the conductivity of the conductive bar 41 (42). According to this configuration, although the magnetic shield 9 is provided near the conductive bar 41 (42), the magnetic shield 9 is less likely to flow current than the conductive bar 41 (42). This prevents the magnetic shield 9 from becoming a magnetic field generation source. As a result, the magnetic shield 9 can efficiently reduce the magnetic flux acting on the current measuring instrument 5.

  Furthermore, as in the present embodiment, an insulating member 92 (see FIG. 5) that electrically insulates the magnetic shield 9 and the conductive bar 41 (42) between the magnetic shield 9 and the conductive bar 41 (42). ) Is preferably provided. According to this configuration, although the magnetic shield 9 is provided near the conductive bar 41 (42), the magnetic shield 9 and the conductive bar 41 (42) are electrically insulated from each other. By flowing, it can be avoided that the magnetic shield 9 becomes a magnetic field generation source. As a result, the magnetic shield 9 can efficiently reduce the magnetic flux acting on the current measuring instrument 5.

  Further, the distribution board 1 according to the present embodiment includes a distribution board cabinet 10, a main breaker 2 electrically connected to the conductive bars 41, 42, and a plurality of connection terminals 411, 411 (421, 421). Are provided with a plurality of branch breakers 3, 3... Electrically connected to each of. According to this configuration, the distribution board 1 has an advantage that a magnetic field generated when a current flows through the conductive bar 41 (42) hardly acts on the current measuring instrument 5.

  By the way, in the present embodiment, the configuration in which the magnetic shield 9 is provided only for the conductive bars 41 and 42 of the first and second voltage electrodes among the three conductive bars 41, 42, and 43 is shown. The configuration is not limited to this. In other words, the neutral pole bar 43 may also be provided with a magnetic shield. In this case, the neutral pole bar 43 is also provided with a magnetic shield between the current measuring instrument 5 and the current measuring instrument 5 from the neutral pole bar 43 as in the case of the conductive bars 41 and 42 of the present embodiment. The magnetic flux heading toward can be reduced (shielded). As a result, even if the number of branch circuits increases and the current flowing through the flat plate 412 (422) increases, the magnetic field generated around the neutral pole bar 43 due to this current hardly affects the current measuring instrument 5. Become. In addition, since the current measuring device 5 is located behind the neutral pole bar 43, it is preferable that the back surface, which is a surface facing the current measuring device 5, is covered with a magnetic shield.

(Embodiment 2)
The distribution board cabinet 10 according to the present embodiment is different from the distribution board cabinet 10 of the first embodiment in that the magnetic shield 9 is disposed so as to cover at least a part of the current measuring instrument 5. Hereinafter, the same configurations as those of the first embodiment are denoted by common reference numerals, and description thereof is omitted as appropriate.

  That is, in this embodiment, the magnetic shield 9 between the flat plate 412 of the conductive bar 41 and the current measuring instrument 5 is not provided on the conductive bar 41 side so as to cover the front surface of the flat plate 412, but at least the current measuring instrument 5. It is provided on the current measuring instrument 5 side so as to cover a part. Similarly, the magnetic shield 9 between the flat plate 422 and the current measuring device 5 of the conductive bar 42 is not provided on the conductive bar 42 side so as to cover the front surface of the flat plate 422 but covers at least a part of the current measuring device 5. Thus, it is provided on the current measuring instrument 5 side.

  In the present embodiment, it is more preferable that the magnetic shield 9 is provided so as to cover at least the back surface of the current measuring device 5 which is the surface facing the flat plate 412 (422) and covers the entire surface of the current measuring device 5. . The magnetic shield 9 only needs to be provided so as to surround at least the current sensor 503 provided on the substrate 501 of the current measuring instrument 5, and is not limited to the configuration covering the surface of the case 502. You may provide so that it may surround.

  In the current measuring instrument 5, the case 502 may also serve as the magnetic shield 9 by forming the case 502 from a magnetic material. Further, the magnetic shield 9 is provided between the flat plate 412 (422) and the current measuring device 5 and has a function of reducing (shielding) the magnetic flux from the flat plate 412 (422) to the current measuring device 5. For example, the plating layer formed in the outer peripheral surface or inner peripheral surface of case 502 may be sufficient.

  According to this configuration, since the magnetic shield 9 is disposed so as to cover at least a part of the current measuring instrument 5, the magnetic shield 9 is not limited to the magnetic field generated by the flat plate 412 (422), but may be, for example, the protruding piece 413. The magnetic field generated by (423) can also be shielded. Therefore, when measuring the current flowing through each of the plurality of connection terminals 411, 411,... (421, 421,...), The current measuring instrument 5 becomes less susceptible to the influence of an external magnetic field, and the measurement accuracy is improved.

  Other configurations and functions are the same as those of the first embodiment.

DESCRIPTION OF SYMBOLS 1 Distribution board 10 Distribution board cabinet 11 Cabinet main body 2 Main breaker 3 Branch breaker 41,42 Conductive bar 411,421 Connection terminal 412,422 Flat plate 5 Current measuring instrument 9 Magnetic shield 92 Insulating member

Claims (6)

The cabinet body,
A conductive bar fixed to the cabinet body and forming a path of power from the main breaker to the plurality of branch breakers;
A current measuring instrument for measuring current,
The conductive bar has a flat plate disposed along the front surface of the cabinet body, and a plurality of connection terminals provided at one end portion in the short direction of the flat plate and arranged in the longitudinal direction of the flat plate, The main breaker can be electrically connected to one end in the longitudinal direction of the flat plate, and each of the plurality of branch breakers can be electrically connected to each of the plurality of connection terminals,
The current measuring instrument is configured to measure a current flowing through each of the plurality of connection terminals based on magnetic flux,
Between the said flat plate and the said current measuring device, the magnetic shield which reduces the magnetic flux which goes to the said current measuring device from the said flat plate is provided. The cabinet for distribution boards with a measuring device characterized by the above-mentioned. The said magnetic shield is arrange | positioned so that the surface opposite to the said current measuring device in the said flat plate may be covered. The distribution board cabinet with a measuring instrument of Claim 1 characterized by the above-mentioned. The cabinet for a distribution board with a measuring instrument according to claim 2, wherein the conductivity of the magnetic shield is lower than the conductivity of the conductive bar. The measuring instrument according to claim 2 or 3, wherein an insulating member that electrically insulates the magnetic shield and the conductive bar is provided between the magnetic shield and the conductive bar. Cabinet for distribution board. The said magnetic shield is arrange | positioned so that at least one part of the said current measuring device may be covered. The distribution board cabinet with a measuring device of Claim 1 characterized by the above-mentioned. A cabinet for a distribution board with a measuring instrument according to any one of claims 1 to 5,
The main breaker electrically connected to the conductive bar;
The distribution board comprising: the plurality of branch breakers electrically connected to each of the plurality of connection terminals.

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