JP2017034924A - Current measurement device and distribution board using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a current measurement device that can reduce the construction error, and a distribution board using the same.SOLUTION: A current measurement device 4 includes a first current measuring unit and a plurality of second current measuring units. The first current measuring unit measures first current flowing through a main breaker. Each of the plurality of second current measuring units measures second current flowing through each of plural branch breakers 3 electrically connected to a secondary side terminal of the main breaker. The first current measuring unit and the plurality of second current measuring units constitute one sensor unit.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a current measuring device and a distribution board using the current measuring device.

  Conventionally, a distribution board is provided that includes a current sensor unit that measures a branch current flowing through each branch breaker and a current transformer that measures a current flowing through a main breaker (see, for example, Patent Document 1).

JP 2014-193103 A

  In the distribution board described in Patent Document 1 described above, a current transformer is attached to the lead-in wire that is drawn into the distribution board, which may cause a construction error.

  This invention is made | formed in view of the said subject, and aims at providing the electric current measuring apparatus which can reduce a construction mistake, and a distribution board using the same.

  The current measuring device according to the present invention includes a first current measuring unit that measures a first current flowing through the main breaker, and a second current flowing through each of the plurality of branch breakers electrically connected to the secondary terminal of the main breaker. And a plurality of second current measurement units that measure current, wherein the first current measurement unit and the plurality of second current measurement units constitute one sensor unit.

  The distribution board according to the present invention includes a main breaker, a plurality of branch breakers electrically connected to secondary terminals of the main breaker, a first current flowing through the main breaker, and a plurality of branch breakers. It is provided with said electric current measurement apparatus which measures the 2nd electric current which flows.

  The current measuring device of the present invention can reduce construction errors.

  The distribution board of the present invention can reduce construction errors.

It is a disassembled perspective view of the principal part of the electricity distribution panel which concerns on embodiment of this invention. It is a perspective view of the principal part of the distribution board which concerns on embodiment of this invention. It is a front view of a distribution board concerning an embodiment of the present invention. 4A is a perspective view before connecting the secondary side terminal of the main breaker and the conductive bar in the distribution board according to the embodiment of the present invention, and FIG. 4B shows the connection of the secondary side terminal of the main breaker and the conductive bar. It is a rear perspective view. 5A to 5C are schematic perspective views of a current measuring device according to a modification of the embodiment of the present invention.

  Hereinafter, the current measuring device 4 and the distribution board 1 according to the embodiment of the present invention will be specifically described with reference to the drawings. However, the configuration described below is merely an example of the present invention, and the present invention is not limited to the following embodiment. Therefore, various modifications other than this embodiment can be made according to the design and the like as long as they do not depart from the technical idea of the present invention.

  In addition, in this embodiment, although the case where the distribution board 1 is used by a detached house is illustrated, not only this example but the distribution board 1 is used for each dwelling unit of a housing complex, an office, a store, etc. May be. In the following description, unless otherwise specified, the top, bottom, left, and right of FIG. 3 are defined as the top, bottom, left, and right of the distribution board 1, and the direction perpendicular to the paper surface of FIG. However, these directions are not intended to limit the direction in which the distribution board 1 is attached.

  As shown in FIGS. 1 to 3, the distribution board 1 of the present embodiment includes a cabinet 11, a main breaker 2, a plurality of branch breakers 3, a current measuring device 4, a measuring unit 5, and a conductive bar 22. , 23, 24. In addition, the distribution board 1 of the present embodiment further includes a first communication adapter 6, a second communication adapter 7, and a third communication adapter 8.

  The distribution board 1 of the present embodiment includes a cabinet 11, a main breaker 2, a plurality of branch breakers 3, a current measuring device 4, and conductive bars 22, 23, 24 as a minimum configuration. It only has to have. Therefore, whether or not the distribution board 1 of the present embodiment includes the measurement unit 5, the first communication adapter 6, the second communication adapter 7, and the third communication adapter 8 is arbitrary.

  The cabinet 11 is made of, for example, a synthetic resin, and is formed in a box shape with an open front surface as shown in FIG. 3, and is used by being attached to a wall of a house. The cabinet 11 has a space for storing at least the main breaker 2, the plurality of branch breakers 3, the current measuring device 4, and the conductive bars 22, 23, and 24.

  Moreover, in the distribution board 1 of this embodiment, the cabinet 11 further has a space for housing the measurement unit 5, the first communication adapter 6, the second communication adapter 7, and the third communication adapter 8. The cabinet 11 is provided with an outer lid 12 that is movable between a position where the front surface of the cabinet 11 is closed and a position where the cabinet 11 is opened.

  The main breaker 2 includes a primary side terminal 21A and a secondary side terminal 21B (see FIG. 4A). A single-phase three-wire lead-in line of a system power supply (commercial power supply) is electrically connected to the primary side terminal 21A. Conductive bars 22, 23, and 24 are electrically connected to the secondary terminal 21B.

  In the distribution board 1 of this embodiment, since a single-phase three-wire system is assumed as a distribution system, the conductive bar 22 is a neutral pole (N-phase) conductive bar, and the conductive bar 23 is a first voltage pole (L1-phase). ) And the conductive bar 24 are used as conductive bars for the second voltage electrode (L2 phase). These conductive bars 22, 23 and 24 are arranged on the right side of the main breaker 2 and are fixed to the cabinet 11 via a base 26 which will be described later.

  Each of the branch breakers 3 is divided into an upper side and a lower side of the conductive bar 22 of the neutral electrode, and a plurality of branch breakers 3 are arranged in the left-right direction (11 in the example of FIG. 3). Each branch breaker 3 includes a primary side terminal and a secondary side terminal.

  Conductive bars 22, 23, and 24 are electrically connected to the primary side terminals. That is, each branch breaker 3 is electrically connected to the secondary side terminal 21 </ b> B of the main breaker 2 through the conductive bars 22, 23, 24. Each of the plurality of electric circuits is electrically connected to the secondary side terminal. For example, one or more devices such as lighting equipment and hot water supply equipment, and wiring equipment such as an outlet and a wall switch are connected to the electric circuit connected to the secondary terminal of each branch breaker 3 as a load.

  Each branch breaker 3 is formed in a contract type dimension (dimensions of a circuit breaker for a light distribution board in accordance with “JIS C 8201-2-1”), and conductive bars 22, 23, and 24 are inserted therein. The insertion port 32 (see FIG. 1) is provided on the surface facing the conductive bars 22, 23, and 24. Here, the conductive bar 23 of the first voltage electrode and the conductive bar 24 of the second voltage electrode have a plurality of connection terminals 25 protruding upward and downward at positions corresponding to the plurality of branch breakers 3 (see FIG. 1). )have.

  Three insertion ports 32 are provided in each branch breaker 3 so as to correspond to each of the three conductive bars 22, 23, 24, and the primary side terminal is the three insertion ports 32. Are provided so as to be exposed in the two insertion ports 32. Thereby, in the state where each branch breaker 3 is attached to the cabinet 11, the conductive bars 22, 23, 24 are inserted into the insertion ports 32, and the primary side terminals are electrically connected to the conductive bars 22, 23, 24. Is done.

  The connection terminal 25 is inserted into the insertion port 32 corresponding to the conductive bar 23 of the first voltage electrode and the conductive bar 24 of the second voltage electrode.

  In the branch breaker 3 connected to the neutral electrode and the first voltage electrode, the primary side terminal is exposed in each insertion port 32 corresponding to the conductive bar 22 of the neutral electrode and the conductive bar 23 of the first voltage electrode. Is provided.

  In addition, the branch breaker 3 connected to the neutral electrode and the second voltage electrode is exposed in each insertion port 32 whose primary side terminals correspond to the conductive bar 22 of the neutral electrode and the conductive bar 24 of the second voltage electrode. It is provided to do.

  Further, the branch breaker 3 connected to the first voltage electrode and the second voltage electrode has a primary terminal in each insertion port 32 corresponding to the conductive bar 23 of the first voltage electrode and the conductive bar 24 of the second voltage electrode. It is provided so as to be exposed.

  More specifically, as shown in FIGS. 1 and 2, the distribution board 1 of this embodiment includes a synthetic resin base 26 that holds the conductive bars 22, 23, and 24.

  The base 26 includes a bottom plate 261 formed in an elongated plate shape that is long in the left-right direction, a prismatic support base 262 that protrudes forward from both ends of the bottom plate 261 in the left-right direction, and a left-right direction on the front surface of the bottom plate 261. And a partition wall 263 protruding forward from the center line along the line. In FIGS. 1 and 2, only one (left side) support base 262 is shown.

  The neutral-polar conductive bar 22 is formed of a conductive metal plate (for example, a copper plate), and both ends in the left-right direction are fixed to the support base 262 so as to be bridged between the pair of support bases 262. . Here, a gap is secured between the front edge of the partition wall 263 and the conductive bar 22.

  The conductive bar 23 of the first voltage electrode is formed of a conductive metal plate (for example, a copper plate), and is attached to a region above the partition wall 263 in the bottom plate 261 of the base 26. The conductive bar 23 includes a flat plate 231 disposed along the bottom plate 261 and a standing piece 232 protruding forward from the lower end edge of the flat plate 231.

  The standing piece 232 is provided at a position corresponding to each of the plurality of branch breakers 3. The front end of each upright piece 232 is divided into two forks, one being a connection terminal 25 protruding upward and the other being a connection terminal 25 protruding downward. The connection terminal 25 protruding downward is located forward of the connection terminal 25 protruding upward, and protrudes below the partition wall 263 through a gap between the partition wall 263 and the conductive bar 22.

  The conductive bar 24 of the second voltage electrode is formed of a conductive metal plate (for example, a copper plate), and is attached to a region below the partition wall 263 in the bottom plate 261 of the base 26. The conductive bar 24 includes a flat plate 241 disposed along the bottom plate 261, and a first upright piece 242 and a second upright piece 243 projecting forward from the upper end edge of the flat plate 241.

  The first upright piece 242 is provided at a position corresponding to each of the plurality of branch breakers 3. The front end of each first upright piece 242 is divided into two forks, one being a connection terminal 25 protruding downward and the other being a connection terminal 25 protruding upward. The connection terminal 25 protruding upward is located forward of the connection terminal 25 protruding downward, and protrudes above the partition wall 263 through a gap between the partition wall 263 and the conductive bar 22.

  The second upright piece 243 is provided at a position corresponding to the secondary terminal 21B of the main breaker 2 attached to the flat plate 241, and the tip of the second upright piece 243 serves as a connection terminal 27 protruding downward. A through hole 271 for passing the fixing screw 31 (see FIG. 4A) is provided at a position near the tip of the connection terminal 27.

  Further, a resin nut 28 is provided at a portion of the flat plate 241 facing the through hole 271 of the connection terminal 27. The resin nut 28 has a function of electrically insulating the conductive bar 24 and the fixing screw 31. The resin nut 28 may be entirely formed of resin, an outer portion that contacts the flat plate 241 may be formed of resin, and an inner portion of the resin nut 28 that contacts the fixing screw 31 may be formed of metal.

  Here, the connection terminal 27 is a portion that is electrically connected to the secondary terminal 21 </ b> B of the main breaker 2 in the conductive bar 24. Moreover, the resin nut 28 fixes the secondary side terminal 21 </ b> B and the connection terminal 27 of the main breaker 2 by screwing the fixing screw 31.

  With the configuration described above, in the distribution board 1 of the present embodiment, the conductive bars 22, 23, and 24 are arranged from the front side (the side opposite to the wall) in the front-rear direction below the neutral conductive bar 22. It arrange | positions so that it may arrange in order of a sex electrode, a 1st voltage pole, and a 2nd voltage pole. On the upper side of the conductive bar 22 of the neutral electrode, the conductive bars 22, 23, and 24 are arranged in the order of the neutral electrode, the second voltage electrode, and the first voltage electrode from the front side (the side opposite to the wall) in the front-rear direction. Arranged side by side.

  Therefore, when the branch breaker 3 has a primary side terminal in each of the insertion ports 32 at both ends in the front-rear direction, the branch breaker 3 is connected to the neutral electrode and the first voltage electrode when attached to the upper side of the conductive bar 22. When attached to the side, it is connected to the neutral electrode and the second voltage electrode.

  The current measuring device 4 is configured to measure a current (first current) flowing through the main breaker 2 and a current (second current) flowing through a load (electric circuit) connected to each of the plurality of branch breakers 3. ing. That is, in the current measuring device 4 of the present embodiment, not only the current flowing through each of the plurality of branch breakers 3 but also the current flowing through the main breaker 2 can be measured. As shown in FIGS. 1 and 2, the current measurement device 4 includes a substrate 41, a plurality of current sensors 42, a plurality of measurement units 46, a current sensor 44, a measurement unit 47, and a calculation unit 48. I have.

  The substrate 41 is a printed circuit board having a multilayer structure formed in a long shape extending in the left-right direction. The substrate 41 is provided with a plurality of through holes 43 penetrating in the thickness direction so as to be arranged in two rows in the front-rear direction and in the left-right direction. Each through hole 43 has a shape through which the connection terminal 25 can penetrate, and the substrate 41 is attached to the conductive bars 23 and 24 so that each of the plurality of connection terminals 25 penetrates the corresponding through hole 43. .

  Further, the substrate 41 is provided with a through hole 45 penetrating in the thickness direction. The through hole 45 has a shape through which the connection terminal 27 can penetrate, and the substrate 41 is attached to the conductive bars 23 and 24 so that the connection terminal 27 penetrates the through hole 45.

  Each current sensor 42 is formed around each through hole 43 in the rear row of the substrate 41. Each current sensor 42 is a Rogowski coil that includes an air-core coil that does not use a core (coreless), and generates an output corresponding to the current flowing through the connection terminal 25. The current sensor 44 is a Rogowski coil that includes an air-core coil that does not use a core (coreless) and generates an output corresponding to the current flowing through the connection terminal 27.

  That is, in the present embodiment, the current sensor 44 that measures the first current flowing through the main breaker 2 and the current sensor 42 that measures the second current flowing through each branch breaker 3 are the same type of sensor. Further, when the current sensors 42 and 44 are Rogowski coils as in this embodiment, magnetic saturation is unlikely to occur, and current measurement is possible even when a large current flows through the main breaker 2 or the branch breaker 3. is there.

  The current sensors 42 and 44 are not limited to the aforementioned Rogowski coil, but may be a current transformer (current transformer), a Hall element, a magnetoresistive element such as a GMR (Giant Magnetic Resistances) element, a shunt resistance, or the like. .

  Each measuring section 46 is provided for each set, with two adjacent current sensors 42, 42 as one set. The measuring unit 47 is provided for the current sensor 44. These measurement units 46 and 47 include an amplifier circuit, an A / D conversion circuit, an integration circuit, and a signal processing circuit. Each measurement unit 46 alternately acquires analog signals output from the corresponding pair of two current sensors 42 and 42 in a time-sharing manner.

  The amplifier circuit includes an amplifier that amplifies an analog signal output from the current sensors 42 and 44. The A / D conversion circuit is configured to convert an analog signal output from the amplifier circuit into a digital signal. The integration circuit is configured to integrate the digital signal output from the A / D conversion circuit.

  That is, the analog signals output from the current sensors 42 and 44 indicate values obtained by differentiating the current flowing through the connection terminals 25 and 27. For this reason, the integrating circuit integrates the digital signal output from the A / D conversion circuit to generate a digital signal indicating the current flowing through the connection terminals 25 and 27. In the measurement units 46 and 47 of this embodiment, an integration circuit is realized by executing a program with a DSP (Digital Signal Processor).

  The signal processing circuit is configured to output the digital signal output from the integration circuit to the computing unit 48 as a current signal. That is, the measurement units 46 and 47 are configured to measure the current flowing through the connection terminals 25 and 27 based on the outputs of the current sensors 42 and 44.

  The computing unit 48 includes an A / D conversion circuit and a processing circuit. The A / D conversion circuit is configured to convert an analog voltage signal output from a measurement unit 5 described later into a digital voltage signal.

  The processing circuit, based on the digital voltage signal output from the A / D conversion circuit and the current signal output from the measuring units 46 and 47, the instantaneous power of the main breaker 2 and the instantaneous power of each of the plurality of electric circuits. Is calculated, and instantaneous power data is generated. The processing circuit is configured to output instantaneous power data as a power signal to the first communication adapter 6 via the measurement unit 5.

  In addition, although the electric current measurement apparatus 4 of this embodiment has a function which calculates the instantaneous electric power of the main breaker 2, and the instantaneous electric power of each of a some electric circuit, the function which calculates instantaneous electric power is not essential. Therefore, the current measuring device 4 only needs to have a function of measuring at least the current (first current) flowing through the main breaker 2 and the current (second current) flowing through each branch breaker 3.

  Here, in the present embodiment, the substrate 41 constitutes a sensor unit. In the present embodiment, the current sensor 44 and the measurement unit 47 constitute a first current measurement unit, and the current sensor 42 and the measurement unit 46 constitute a second current measurement unit. Further, in the present embodiment, the through portion is configured by the through holes 43 and 45 formed in the substrate 41.

  The measuring unit 5 is electrically connected to the current measuring device 4 described above. The measurement unit 5 has a function of measuring the line voltage of the main breaker 2 and the line voltage of each of the plurality of electric circuits and outputting the line voltage data to the current measuring device 4 as a voltage signal.

  The measurement unit 5 is electrically connected to the secondary terminal of any branch breaker 3, and power for power supply is supplied through the branch breaker 3. The measurement unit 5 is configured to generate power for the first communication adapter 6 based on the power for power supply and supply the generated power for power to the first communication adapter 6. . The measurement unit 5 may be configured so that power for power supply is directly supplied from the conductive bars 22, 23, and 24.

  The first communication adapter 6 has a function of communicating with a controller configured to control a device compatible with HEMS (Home Energy Management System) (hereinafter referred to as a HEMS compatible device). Here, the HEMS-compatible device only needs to be a power consumption management target, for example, a smart meter, a solar power generation device, a power storage device, a fuel cell, an electric vehicle, an air conditioner, a lighting fixture, a hot water supply device, a refrigerator, a television receiver, and the like. including. The HEMS compatible device is not limited to these devices.

  The communication method between the first communication adapter 6 and the controller is, for example, a 920 MHz band specific low-power radio station (a radio station that does not require a license), ZigBee (registered trademark), Bluetooth (registered trademark), or other radio wave medium. Wireless communication may be used. Further, the communication method between the first communication adapter 6 and the controller may be wired communication such as a wired LAN (Local Area Network).

  Furthermore, as a communication protocol in communication between the first communication adapter 6 and the controller, for example, Ethernet (registered trademark), ECHONET Lite (registered trademark), or the like may be used.

  The distribution board 1 of the present embodiment is configured to transmit the instantaneous power of the main breaker 2 and the instantaneous power of each of the plurality of electric circuits from the current measuring device 4 to the first communication adapter 6 via the measuring unit 5. Has been. The first communication adapter 6 has a function of calculating power amount data obtained by integrating the collected instantaneous power data over a predetermined time. Therefore, the controller that communicates with the first communication adapter 6 can control the HEMS-compatible device based on the instantaneous power and the amount of power in each of the plurality of electric circuits.

  The second communication adapter 7 has a function of communicating with the power meter. The power meter is a so-called smart meter that measures the amount of power used by the facility and communicates with the concentrator connected to the distribution line to enable remote meter reading. It is configured. Further, the power meter can transmit a measured value (amount of power used), request information, and the like to the second communication adapter 7 by communicating with the second communication adapter 7.

  The request information is information for suppressing consumption of power transmitted from a server operated by a power supply company or the like to a consumer.

  Here, it is preferable that the second communication adapter 7 is configured to transmit the measured value received from the power meter to the first communication adapter 6. In this case, the controller that communicates with the first communication adapter 6 may be configured to control the HEMS-compatible device using the measurement value. According to this configuration, the controller can control the HEMS-compatible device based on the measurement value transmitted from the power meter.

  The second communication adapter 7 is mechanically coupled to and electrically connected to the first communication adapter 6. In the distribution board 1 of the present embodiment, the first communication adapter 6 and the second communication adapter 7 are connected by a board-to-board connection in a state where a part of each is overlapped in the front-rear direction. .

  The communication method between the second communication adapter 7 and the power meter may be, for example, wireless communication such as a specific low power wireless station (wireless station that does not require a license) in the 920 MHz band, or wired LAN or power line carrier communication. Wired communication such as (PLC: Power Line Communications) may be used.

  The third communication adapter 8 has a function of communicating with at least one of a solar power generation device, a power storage device, and a power conversion device electrically connected to the electric vehicle. The power conversion device is used for both charging and discharging of a storage battery of an electric vehicle by performing power conversion in both directions in addition to power conversion for performing unidirectional charging from the distribution board 1 to the electric vehicle. It may be a configuration.

  Moreover, the 3rd communication adapter 8 has a communication function with at least one of a gas meter and a water meter. A gas meter or a water meter outputs a pulse signal corresponding to the amount used. The 3rd communication adapter 8 receives a pulse signal from a gas meter or a water meter, and converts it into the amount of use using the conversion value (conversion rate) of the amount of use per pulse determined beforehand.

  The third communication adapter 8 is mechanically coupled to and electrically connected to the first communication adapter 6. In the distribution board 1 of the present embodiment, the first communication adapter 6 and the third communication adapter 8 are connected by a board-to-board connection with a part of each of the first communication adapter 6 and the third communication adapter 8 overlapping in the front-rear direction. .

  The communication method between the third communication adapter 8 and the solar power generation device, the power storage device, and the power conversion device is, for example, wired communication such as RS-485. The third communication adapter 8 may be capable of communicating with, for example, a hot water storage type hot water supply device (EcoCute (registered trademark)). However, the communication method between the third communication adapter 8, the gas meter, and the water meter is not limited to wired communication, and may be wireless communication.

  In the distribution board 1 of the present embodiment, the third communication adapter 8 has the two communication functions described above, but may be configured by two adapters having each communication function individually. .

  By the way, in the distribution board 1 of this embodiment, as shown in FIG. 3, in addition to the plurality of branch breakers 3, the secondary interconnection breaker 9 is electrically connected to the conductive bars 22, 23, and 24. . The secondary interconnection breaker 9 is a breaker having 3P3E (the number of poles is 3 and the number of elements is 3), and the dimension in the left-right direction is the size of a plurality (three) of the branch breakers 3. The secondary interconnection breaker 9 is electrically connected to a first distributed power source that is not allowed to flow backward to the power system. Examples of the first distributed power source include a fuel cell, a gas power generation device, and a power storage device.

  Similar to the branch breaker 3, the secondary interconnection breaker 9 includes a primary side terminal and a secondary side terminal 91 (see FIG. 3). Conductive bars 22, 23 and 24 are electrically connected to the primary side terminal, and a first distributed power source is electrically connected to the secondary side terminal 91. That is, the secondary interconnection breaker 9 is electrically connected between the secondary terminal 21B of the main breaker 2 and the first distributed power source.

  For this reason, the secondary interconnection breaker 9 disconnects the first 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 first distributed power source ( To work out). In addition, it is arbitrary whether the distribution board 1 of this embodiment is provided with the secondary interconnection breaker 9. FIG.

  In addition, the distribution board 1 of the present embodiment has a space in which the primary interconnection breaker is attached to the left side of the main breaker 2 in the cabinet 11. In the distribution board 1 of this embodiment, as shown in FIG. 3, the support stand 13 is attached to the cabinet 11 in the space. The primary interconnection breaker is attached to the support base 13.

  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 primary interconnection breaker is electrically connected to a second distributed power source that is allowed to reverse flow to the power system. In addition, as a 2nd distributed power supply, there exists a solar power generation device etc., for example.

  The primary interconnection breaker includes a primary side terminal and a secondary side terminal. A primary side terminal 21A of the main breaker 2 is electrically connected to the primary side terminal, and a second distributed power source is electrically connected to the secondary side terminal. That is, the primary interconnection breaker is electrically connected between the primary side terminal 21A of the main breaker 2 and the second distributed power source.

  For this reason, the primary interconnection breaker disconnects the second distributed power source from the power system when, for example, the power supply from the system power source is stopped or an abnormality occurs in the system power source or the second distributed power source (disconnection). To work). In addition, it is arbitrary whether the electricity distribution panel 1 of this embodiment is provided with a primary interconnection breaker.

  By the way, in the distribution board 1 of this embodiment, it is comprised so that the electric current which flows into the main breaker 2 may also be measured with the electric current measurement apparatus 4. FIG. Further, the distribution board 1 of the present embodiment is configured to measure the current (first current) flowing through the main breaker 2 between the main breaker 2 and the plurality of branch breakers 3. Therefore, the secondary terminal 21B of the main breaker 2 is electrically connected to the connection terminal 27 provided on the conductive bar 24 as shown in FIGS. 4A and 4B. Hereinafter, a connection procedure between the secondary terminal 21B and the connection terminal 27 will be described.

  First, the operator matches the position of the resin nut 28 provided on the conductive bar 24 with the position of the secondary terminal 21 </ b> B of the main breaker 2. At this time, the operator matches the position of the through hole 211 of the secondary terminal 21 </ b> B with the position of the screw hole 281 of the resin nut 28. At this time, the worker arranges the insulating sheet 30 formed in the same shape as the secondary side terminal 21 </ b> B between the secondary side terminal 21 </ b> B and the flat plate 241 of the conductive bar 24. The insulating sheet 30 electrically insulates the secondary terminal 21 </ b> B from the flat plate 241 of the conductive bar 24.

  Next, the worker arranges the spacer 29 between the secondary terminal 21 </ b> B and the connection terminal 27 in the front-rear direction. The spacer 29 is made of a conductive metal material (such as a copper alloy) and is formed in a cylindrical shape with the front-rear direction as the axial direction. When the spacer 29 is disposed between the secondary terminal 21B and the connection terminal 27, the through hole 271 of the connection terminal 27, the through hole 291 of the spacer 29, the through hole 211 of the secondary terminal 21B, and the resin nut 28 screw holes 281 are continuous in the front-rear direction.

  Then, the operator passes the fixing screw 31 through the through holes 271, 291, 211, and then screws the fixing screw 31 into the screw hole 281 of the resin nut 28 to fix the secondary terminal 21B to the conductive bar 24. In the distribution board 1 configured as described above, the current flowing through the main breaker 2 flows through the path of the secondary terminal 21B → the spacer 29 → the connection terminal 27 as shown by an arrow a1 in FIG. Flow into the flat plate 241.

  As described above, the current measuring device 4 of the present embodiment has a structure in which the substrate 41 is assembled to the conductive bars 22, 23, and 24, and therefore is assembled at the factory. Therefore, construction errors can be reduced as compared with the case where a current transformer is assembled to the lead-in line as in a conventional distribution board, and as a result, erroneous measurement of the current flowing through the main breaker 2 can be reduced.

  Moreover, in the distribution board 1 of this embodiment, since the current transformer like the conventional distribution board is unnecessary, size reduction of the distribution board 1 can be achieved. Furthermore, since the number of parts can be reduced by the amount of the current transformer as compared with the conventional distribution board, the weight of the distribution board 1 can be reduced while suppressing an increase in cost.

  In the present embodiment, the sensor unit is configured by only the substrate 41. However, the sensor unit may be configured by the case storing the substrate 41 and the substrate 41. In other words, in the present embodiment, the substrate 41 is a single structure, but the case may be a single structure. In this case, the substrate accommodated in the case may be one or may be divided into a plurality of substrates.

  By the way, as a modification of the present embodiment, as shown in FIG. 5A, in the current measuring device 4A, each of the plurality of through holes 49 through which the connection terminals 25 and 27 pass is opened to the rear of the current measuring device 4A. Also good. That is, in the current measuring device 4A, a plurality of open portions 50 are formed in the substrate 41 corresponding to the plurality of through holes 49 so that each of the plurality of through holes 49 is opened rearward.

  In this configuration, the current measuring device 4 </ b> A can be attached to the conductive bars 22, 23, 24 even when the main breaker 2 and the plurality of branch breakers 3 are attached to the cabinet 11. That is, since the connection terminals 25 and 27 can be introduced into the through hole 49 through the open portion 50, the current measuring device 4 </ b> A can be attached to the cabinet 11 without removing the main breaker 2 and the branch breaker 3. In short, in the modification of this embodiment, the rear of the current measuring device 4A is the mounting direction of the current measuring device 4A.

  Therefore, according to this modification, when the current measuring device 4A is retrofitted, the workability is improved as compared with the case where the main circuit breaker 2 and the plurality of branch breakers 3 are once detached and the current measuring device 4 is attached. There is.

  5A, the same number of substrates as the main breaker 2 and the plurality of branch breakers 3 are provided so that the plurality of through holes 49 and the plurality of open portions 50 correspond to the main breaker 2 and the plurality of branch breakers 3. 41 is formed. Therefore, in the configuration shown in FIG. 5A, the current flowing through all the main breakers 2 and branch breakers 3 attached to the conductive bars 22, 23, 24 is obtained by assembling the current measuring device 4 </ b> A to the conductive bars 22, 23, 24. It can be measured.

  Furthermore, as shown in FIG. 5B, the current measuring device 4B may be divided into a plurality in the left-right direction. In the example of FIG. 5B, three through holes 49 and three open portions 50 are formed in the substrate 41 so as to correspond to the main breaker 2 and the two branch breakers 3. Further, as illustrated in FIG. 5C, the current measuring device 4C may be divided for each current sensor 42 (or current sensor 44) in the left-right direction.

  Thus, the current measuring devices 4B and 4C divided into a plurality in the left-right direction can be attached only to the necessary electric circuit. Here, in the modification of the present embodiment, the through hole 49 and the opening portion 50 constitute a through portion. In addition, when using the current measuring devices 4B and 4C, the substrate 41 is accommodated in the above-described case to constitute one sensor unit.

  As described above, the current measuring device 4 of the present embodiment includes the first current measuring unit (current sensor 44 and measuring unit 47) and the plurality of second current measuring units (current sensor 42 and measuring unit 46). Prepare. The first current measuring unit measures the first current flowing through the main breaker 2. Each of the plurality of second current measuring units measures a second current flowing through each of the plurality of branch breakers 3 electrically connected to the secondary side terminal 21 </ b> B of the main breaker 2. The first current measurement unit and the plurality of second current measurement units constitute one sensor unit (substrate 41).

  According to the said structure, since a sensor unit is assembled | attached in a factory, a construction mistake can be reduced compared with the case where a current transformer is attached to a lead-in wire like the conventional distribution board. Moreover, since a 1st current measurement part and a 2nd current measurement part can be constructed only by assembling a sensor unit, there also exists an advantage that an assembly property improves.

  Moreover, it is preferable that the sensor unit has the board | substrate 41 in which the 1st current measurement part and the several 2nd current measurement part were integrally formed like the current measurement apparatus 4 of this embodiment.

  According to the said structure, a 1st current measurement part and a 2nd current measurement part can be constructed only by assembling the board | substrate 41, and there exists an advantage that an assembly property improves. Further, by arranging the sensor (current sensors 42 and 44) and the electronic circuit (measurement units 46 and 47) on the same substrate 41, the current measurement device 4 having excellent noise resistance can be realized.

  Moreover, it is preferable that the sensor (current sensor 44) for measuring the first current and the sensor (current sensor 42) for measuring the second current are the same type of sensors as in the current measuring device 4 of the present embodiment. .

  According to the above configuration, the cost can be reduced as compared with the case where the sensor for measuring the first current and the sensor for measuring the second current are different types of sensors. The same circuit can be used for the electronic circuits (measurement units 46 and 47) to which the sensor measurement results are input.

  Further, like the current measuring device 4 of the present embodiment, the sensor is preferably a sensor using an air-core coil.

  According to the above configuration, magnetic saturation is unlikely to occur, and there is an advantage that current measurement is possible even when a large current flows through the main breaker 2 or the branch breaker 3.

  Further, like the current measuring device 4 of the present embodiment, the sensor may be a magnetic sensor.

  According to the said structure, size reduction can be achieved compared with the case where the 1st electric current which flows into the main breaker 2 is measured with a current transformer.

  Further, like the current measuring device 4 of the present embodiment, the first current measuring unit preferably measures the first current between the main breaker 2 and the plurality of branch breakers 3.

  According to the said structure, since the electric current measurement apparatus 4 can be assembled | attached in a factory, a construction mistake can be reduced and also the work in the construction site of the distribution board 1 can also be reduced.

  The distribution board 1 according to the present embodiment includes a main breaker 2, a plurality of branch breakers 3, and a current measuring device 4. The plurality of branch breakers 3 are electrically connected to the secondary side terminal 21 </ b> B of the main breaker 2. The current measuring device 4 measures the first current flowing through the main breaker 2 and the second current flowing through each of the plurality of branch breakers 3.

  According to the said structure, a construction mistake can be reduced by using the above-mentioned current measuring device 4.

  Moreover, like the distribution board 1 of this embodiment, it further includes a plurality of conductive bars 22 to 24 that electrically connect the secondary side terminal 21 </ b> B of the main breaker 2 and the primary side terminals of the plurality of branch breakers 3. It is preferable. In this case, each of the first current measurement unit and the plurality of second current measurement units has through portions (through holes 43, 45) through which a part of the plurality of conductive bars 22, 23, 24 (connection terminals 25, 27) penetrates. ) Is preferable.

  According to the above configuration, each of the main breaker 2 and the plurality of branch breakers 3 can be achieved by simply passing a part of the conductive bars 22, 23, 24 (connection terminals 25, 27) through the through portions (through holes 43, 45). Can be measured.

DESCRIPTION OF SYMBOLS 1 Distribution board 2 Main breaker 3 Branch breaker 4 Current measuring device 21B Secondary side terminals 22-24 Conductive bar 25, 27 Connection terminal 41 Board | substrate (sensor unit)
42 Current sensor (second current measurement unit)
43 Through hole (penetrating part)
44 Current sensor (first current measurement unit)
45 Through hole (penetrating part)
46 Measurement unit (second current measurement unit)
47 Measurement unit (first current measurement unit)

Claims (8)

A first current measuring unit for measuring a first current flowing through the main breaker;
A plurality of second current measuring units for measuring a second current flowing in each of a plurality of branch breakers electrically connected to a secondary terminal of the main breaker;
The current measuring device, wherein the first current measuring unit and the plurality of second current measuring units constitute one sensor unit.   The current measuring device according to claim 1, wherein the sensor unit includes a substrate on which the first current measuring unit and the plurality of second current measuring units are integrally formed.   The current measuring device according to claim 1, wherein the sensor that measures the first current and the sensor that measures the second current are the same type of sensor.   The current measuring device according to claim 3, wherein the sensor is a sensor using an air-core coil.   The current measuring device according to claim 3, wherein the sensor is a magnetic sensor.   The current measuring device according to claim 1, wherein the first current measuring unit measures the first current between the main breaker and the plurality of branch breakers. With the main breaker,
A plurality of branch breakers electrically connected to the secondary terminal of the main breaker;
The current measuring device according to any one of claims 1 to 6, further comprising: a first current flowing through the main breaker and a second current flowing through each of the plurality of branch breakers. Distribution board. A plurality of conductive bars that electrically connect secondary terminals of the main breaker and primary terminals of the plurality of branch breakers;
8. The distribution board according to claim 7, wherein each of the first current measurement unit and the plurality of second current measurement units has a through portion through which a part of the plurality of conductive bars penetrates. .

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