JP6697733B2 - Current sensor and distribution board equipped with the same - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a current sensor and a distribution board including the current sensor, and more particularly to a current sensor used in a cabinet of the distribution board for use, and a distribution board including the current sensor.

  Conventionally, there has been proposed a distribution board in which a main breaker, a branch breaker, and a terminal block are housed in a cabinet (case) (for example, refer to Patent Document 1).

  In the distribution board described in Patent Document 1, the terminal block has a primary terminal, a secondary terminal, a conductive block electrically connecting the primary terminal and the secondary terminal, and a current flowing through the conductive block. It consists of a current transformer to measure. This terminal block connects a primary breaker or a secondary breaker with a main breaker or a branch breaker that is the target of current measurement, so that the current (main trunk current or branch current) flowing in the conductive block is converted by a current transformer. taking measurement.

JP, 2011-36034, A

  In the configuration described in Patent Document 1, in order to measure the current with the terminal block as the current sensor, when installing the current sensor (terminal block), the main circuit breaker or the branch breaker to be measured with the current sensor (terminal It is necessary to make an electrical connection to the stand).

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a current sensor that can be easily mounted, and a distribution board including the current sensor.

  A current sensor according to one aspect of the present invention includes a body, a core, and a detection coil. The body is attached to a cabinet of a distribution board. The core is held by the body and forms a closed magnetic circuit that surrounds a flat plate-shaped conductive member provided on the distribution board. The detection coil is wound around the core and outputs an electric signal according to a current flowing through the conductive member. The body has a first body and a second body. The core has a first core held by the first body and a second core held by the second body. In the core, the conductive member penetrates between the first core and the second core by abutting the end of the first core and the end of the second core in a predetermined facing direction. Is formed so as to form a through space. The current sensor further includes a pressing member, a pressure receiving member, and an operating member. The pressing member is arranged on the side opposite to the through space in the facing direction with respect to the movable core formed of at least one of the first core and the second core. The pressing member is elastically deformable. The pressure receiving member is arranged so as to sandwich the pressing member between the pressure receiving member and the movable core. The pressure receiving member has a pressure receiving surface facing the movable core in the facing direction. The operation member is operable to move the pressure receiving member to move the position of the pressure receiving surface in the facing direction from the first position to the second position. The second position is closer to the movable core than the first position.

  A distribution board according to an aspect of the present invention includes the current sensor and the cabinet having a mounting structure to which the body is mounted.

  According to the current sensor of the present invention and the distribution board equipped with the current sensor, there is an advantage that the mounting work is simple.

FIG. 1A is a cross-sectional view showing a main part of a current sensor according to a first embodiment of the present invention, in which the pressure receiving surface is in a first position, and FIG. 1B shows a main part of the same current sensor as shown in FIG. It is sectional drawing of the state in a 2nd position. FIG. 2 is a front view of the distribution board according to the first embodiment of the present invention. FIG. 3 is a block diagram showing the configuration of a power measurement system including the above current sensor. FIG. 4 is a bottom view showing the above-mentioned current sensor attached to a cabinet. FIG. 5A is a front view showing a main part of the above current sensor, and FIG. 5B is a bottom view showing a main part of the above current sensor. FIG. 6A is a cross-sectional view showing the main part of the bipolar sensor current sensor according to the first embodiment of the present invention, in which the pressure receiving surface is in the first position, and FIG. 6B is the same bipolar electrode current sensor. FIG. 7 is a cross-sectional view showing a main part and a state in which a pressure receiving surface is in a second position. FIG. 7A shows a main part of a current sensor according to a first modified example of the first embodiment of the present invention, and is a cross-sectional view showing a state where the pressure receiving surface is at the first position, and FIG. 7B shows a main part of the same current sensor. FIG. 6 is a cross-sectional view showing the pressure receiving surface in the second position. FIG. 8 is a partially cutaway bottom view showing the current sensor according to the second embodiment of the present invention. FIG. 9: is a perspective view which shows the principal part of the current sensor same as the above.

(Embodiment 1)
(1.1) Overall Outline As shown in FIG. 2, the current sensor 30 according to the present embodiment is used by being attached to the cabinet 70 of the distribution board 1. The distribution board 1 is provided with a flat plate-shaped conductive member 84. The conductive member 84 is a member for electrically connecting the plurality of branch breakers 20. The current sensor 30 is attached to the cabinet 70 similarly to the plurality of branch breakers 20, and thus detects the current flowing through the conductive member 84 in a non-contact manner. The current sensor 30 has a detection coil 60 (see FIG. 1A), and the current flowing through the conductive member 84 can be measured using the output (electrical signal) of the detection coil 60.

  As shown in FIGS. 1A and 1B, the current sensor 30 according to this embodiment includes a body 40, a core 50, and a detection coil 60. The body 40 is attached to the cabinet 70 (see FIG. 2) of the distribution board 1 (see FIG. 2). The core 50 is held by the body 40 and forms a closed magnetic circuit that surrounds the flat plate-shaped conductive member 84 provided on the distribution board 1. The detection coil 60 is wound around the core 50 and outputs an electric signal corresponding to the current flowing through the conductive member 84.

  The body 40 has a first body 41 and a second body 42. The core 50 has a first core 51 held by the first body 41 and a second core 52 held by the second body 42. The core 50 is configured such that the end portion 511 of the first core 51 and the end portion 521 of the second core 52 are abutted against each other in a predetermined facing direction, so that the conductive member 84 is provided between the first core 51 and the second core 52. To form a through space 500 through which

  The current sensor 30 further includes a pressing member 90, a pressure receiving member 91, and an operating member 92. The pressing member 90 is arranged on the side opposite to the through space 500 in the facing direction with respect to the movable core formed of at least one of the first core 51 and the second core 52. The pressing member 90 is elastically deformable. The pressure receiving member 91 is arranged so as to sandwich the pressing member 90 between the pressure receiving member 91 and the movable core. The pressure receiving member 91 has a pressure receiving surface 911 facing the movable core in the facing direction. The operating member 92 can be operated by moving the pressure receiving member 91 so as to move the position of the pressure receiving surface 911 in the facing direction from the first position (see FIG. 1A) to the second position (see FIG. 1B). is there. The second position is a position closer to the movable core than the first position.

  The configuration and function of each part of the current sensor 30 as described above are as follows in a state where the body 40 is attached to the cabinet 70, that is, when both the first body 41 and the second body 42 are attached to the cabinet 70. Structure and function. The term “butt” as used herein means to bring them so close to each other that they are likely to stick to each other, and includes not only the state where they are in contact with each other but also the state where they are not in contact with each other. For example, when the end portion 511 and the end portion 521 are abutted against each other, it means that the exposed end portion 511 and the end portion 521 face each other, and the end portion 511 and the end portion 521 are opposed to each other. It means a state where no foreign matter such as the body 40 is present.

  In short, in the current sensor 30 according to the present embodiment, the core 50 is divided into the first core 51 and the second core 52, and the conductive member 84 penetrates between the first core 51 and the second core 52. The through space 500 is formed. Therefore, by attaching the body 40 to the cabinet 70 so that the conductive member 84 is sandwiched between the first core 51 and the second core 52, the output (electric signal) of the detection coil 60 is used to move the conductive member 84. The flowing current can be measured. Therefore, in this current sensor 30, in order to measure the current flowing through the conductive member 84, it is not necessary to electrically connect the conductive member 84, which is the current measurement target, to the current sensor 30. Therefore, the current sensor 30 has an advantage that the mounting work is easy.

  Further, according to the current sensor 30 having the above-described configuration, when the pressure receiving surface 911 is at the second position, the pressing member is pressed between the pressure receiving surface 911 and the movable core as compared with the state where the pressure receiving surface 911 is at the first position. 90 is compressed. Therefore, when at least the pressure receiving surface 911 is in the second position, the elastic deformation of the pressing member 90 causes the pressing core 90 to press the first core 51 and the second core 52 against each other against the movable core. The pressing force acts. Therefore, by applying the pressing force to the movable core, an air gap is less likely to be formed between the first core 51 and the second core 52, and it is possible to suppress a decrease in current measurement accuracy due to the air gap. .. Moreover, the movement of the pressure receiving surface 911 from the first position to the second position is performed by operating the operation member 92. Therefore, an operator who attaches the current sensor 30 can perform an operation for operating the operation member 92 to apply the pressing force to the movable core, in addition to the operation for attaching the body 40 to the cabinet 70. .. As a result, the pressing force can be reliably applied to the movable core, and an air gap is less likely to occur between the first core 51 and the second core 52.

(1.2) Detailed Description Hereinafter, the current sensor 30 according to the present embodiment and the distribution board 1 including the current sensor 30 will be described in detail. However, the configuration described below is merely an example of the present invention, and the present invention is not limited to the following embodiment, and other than this embodiment, it deviates from the technical idea of the present invention. Various changes can be made according to the design and the like as long as the range is not.

  In the present embodiment, the current sensor 30 is used in a power measuring system for measuring at least one of power consumption and power consumption in a customer facility. The term "consumer facility" as used herein means a facility of a consumer of electric power, and not only a facility that receives power supply from an electric power company such as an electric power company, but also a power generation facility such as a solar power generation facility Includes facilities that receive power. In the present embodiment, a non-residential facility such as a store or an office will be described as an example of a consumer facility. However, the customer facility is not limited to this example, and may be an apartment house, a detached house, or each dwelling unit of the apartment house.

(1.2.1) Distribution Board Here, the basic configuration of the distribution board 1 including the current sensor 30 of the present embodiment will be described first with reference to FIG. In the present embodiment, a distribution board 1 of single-phase three-wire system capable of taking out AC 100 [V]/200 [V] will be described as an example.

  The distribution board 1 includes a cabinet 70, a main breaker 10, a plurality (18 in the example of FIG. 2) of branch breakers (circuit breakers) 20, and at least one (3 in the example of FIG. 2). And the current sensor 30 of FIG. Below, the upper and lower sides and the left and right sides (the upper and lower sides, the left and right sides, and the front and rear sides indicated by arrows in FIG. 1A, FIG. 1B, and FIG. 2) in the state where the distribution board 1 is installed are described as the upper and lower sides, the left and right sides, and the front and rear sides. This does not mean that the mounting directions of the distribution board 1 and the current sensor 30 are limited to the direction of. In FIG. 1A, FIG. 1B, FIG. 2, etc., the up, down, left and right, and front and rear arrows are arrows for indicating directions and do not have substance.

  The cabinet 70 is formed in a box shape having an opening 71 on the front surface. The cabinet 70 is formed in a rectangular shape whose front view is long in the vertical direction. A pair of rail members 73 facing each other in the left-right direction are installed on the bottom plate 72 of the cabinet 70. A first mounting plate 74 and a second mounting plate 75 are fixed to the pair of rail members 73. Each of the first mounting plate 74 and the second mounting plate 75 is installed so as to be bridged between the pair of rail members 73. The first mounting plate 74 is arranged above the second mounting plate 75. A mounting base 76 made of synthetic resin is fixed to the front surface of the second mounting plate 75.

  The main breaker 10 is attached to the cabinet 70 by being attached to the front surface of the first attachment plate 74 which is a part of the cabinet 70. The plurality of branch breakers 20 are attached to the cabinet 70 by being attached to the attachment base 76 which is a part of the cabinet 70. The cabinet 70 may have a door that closes the opening 71.

  The primary-side terminal 11 of the main breaker 10 is electrically connected to an AC power supply 200 (see FIG. 3) via a three-wire power line (main line) 81. Three busbar conductors 82 (see FIG. 3) of L1 phase, L2 phase, and N phase are electrically connected to the secondary side terminal 12 of the main breaker 10. These three bus bar conductors 82 are electrically connected to the L1 phase, L2 phase, and N phase power lines 81 in a one-to-one relationship. Each of the three busbar conductors 82 includes a connecting member (joint bar) 83 directly connected to the main breaker 10 and a conductive member (conductive bar) 84 connected to the main breaker 10 via the connecting member 83 (see FIG. 4). See) and.

  Each of the three conductive members 84 is formed of a conductive material such as copper into a long flat plate shape (strip shape). The three conductive members 84 are held by the mounting base 76 in a direction such that their longitudinal directions coincide with the vertical direction and their thickness directions coincide with the front-rear direction. The three conductive members 84 are attached to the center of the attachment base 76 in the left-right direction so as to be arranged in front of the attachment base 76 at appropriate intervals in the front-rear direction (each thickness direction). In the present embodiment, the three conductive members 84 are arranged from the front in the order of the L1 phase, the N phase, and the L2 phase. Here, each of the three conductive members 84 is located above and below the mounting base 76 so that the three conductive members 84 are located in front of the mounting base 76 across both ends in the vertical direction of the mounting base 76. It is formed longer than the dimension in the direction.

  Each of the three connecting members 83 is formed of a conductive material such as copper. The three connecting members 83 electrically connect each of the three conductive members 84 and the primary side terminal 11 of the main breaker 10.

  By connecting the plurality of branch breakers 20 to the conductive member 84, the branch breakers 20 are electrically connected to the secondary side terminals 12 of the main breaker 10 via the bus conductors 82. Each branch breaker 20 is mounted in a mounting space provided on both sides (left side and right side) of the conductive member 84 in the lateral direction (left-right direction) of the front surface of the mounting base 76. The mounting base 76 is provided with a plurality (24 in this embodiment) of mounting structures 760 (see FIG. 4) for holding the branch breaker 20. In the distribution board 1 illustrated in FIG. 2, the plurality of mounting structures 760 are arranged on both sides in the lateral direction of the conductive member 84 so as to be aligned in the vertical direction (12 in the present embodiment). ing. Thereby, the branch breaker 20 is divided into both sides in the lateral direction of the conductive member 84, and a plurality (12 in the present embodiment) can be attached to each of them.

  Each branch breaker 20 has a power supply terminal and a load terminal, the power supply terminal is electrically connected to the conductive member 84, and a branch circuit is connected to the load terminal. Each branch breaker 20 has a slit into which the three conductive members 84 are inserted, on the surface facing the conductive member 84. Three slits are provided so as to correspond to the three conductive members 84. The power supply terminal of each branch breaker 20 is provided so as to be exposed in two of these three slits. As a result, in each branch breaker 20 mounted on the mounting base 76, the conductive member 84 is inserted into the slit, and the power supply terminal is electrically connected to the conductive member 84.

  In the branch breaker 20 for 100 [V] connected to the N phase and the L1 phase, power supply terminals are provided in the slits corresponding to the N phase conductive member 84 and the L1 phase conductive member 84, respectively. The branch breaker 20 for 100 [V] connected to the N phase and the L2 phase is provided with a power supply terminal at each of the slits corresponding to the N phase conductive member 84 and the L12 phase conductive member 84. The branch breaker 20 for 200 [V] connected to the L1 phase and the L2 phase is provided with a power supply terminal in each of the slits corresponding to the L1 phase conductive member 84 and the L2 phase conductive member 84.

  By the way, in the present embodiment, the current sensor 30 is attached to the attachment base 76 made of synthetic resin similarly to the plurality of branch breakers 20. Therefore, the mounting base 76 is mounted on the front surface of the second mounting plate 75, so that the current sensor 30 is housed in the cabinet 70.

  Here, each of the first body 41 and the second body 42 of the current sensor 30 has a mounting portion 400 (see FIG. 4) corresponding to the mounting structure 760 for the circuit breaker (for the branch breaker 20) in the cabinet. ing. Each of the first body 41 and the second body 42 is attached to the cabinet 70 by the attachment portion 400. Details of the mounting structure 760 will be described in the section “(1.2.3) Single-pole current sensor”.

(1.2.2) Electric Power Measurement System Next, the configuration of the electric power measurement system using the current sensor 30 will be described with reference to FIGS. 2 and 3.

  The power measuring system according to the present embodiment includes at least one current sensor 30 and a measuring device 100. In the present embodiment, the power measuring system includes a plurality of current sensors 31 to 33. In the present embodiment, if each of the current sensors 31 to 33 is not particularly distinguished, each of the current sensors 31 to 33 is referred to as “current sensor 30”.

  Each of the current sensors 31 to 33 is electrically connected to the measuring device 100. As a result, the measuring apparatus 100 can measure the current flowing through the conductive member 84 based on the output of the current sensor 30. Although the measuring device 100 is installed outside the cabinet 70 in the present embodiment, the measuring device 100 is not limited to this example and may be installed inside the cabinet 70.

  The measuring apparatus 100 mainly has a microcomputer, for example, and realizes various functions by executing a program recorded in a memory of the microcomputer by a CPU (Central Processing Unit). The program may be recorded in advance in the memory of the microcomputer, may be recorded in a recording medium such as a memory card and provided, or may be provided through an electric communication line.

  In the present embodiment, the measuring apparatus 100 calculates at least one of power consumption and power consumption as a measurement value. The measuring apparatus 100 monitors the line voltage of the power line 81, and obtains a measured value by performing calculation using the line voltage and the output of the current sensor 30. The measuring device 100 outputs the obtained measured value to the display device and displays the measured value on the display device.

  By the way, in the present embodiment, the eighteen branch breakers 20 are divided into a plurality of breaker groups G1 to G3. Specifically, as shown in FIG. 2, the eighteen branch breakers 20 are classified into breaker groups G1 to G3 in units of six in the longitudinal direction (vertical direction) of the conductive member 84. Of the breaker groups G1 to G3, the breaker group G1 is closest to the main breaker 10 and the breaker group G3 is farthest from the main breaker 10. They are arranged in order from.

  Here, the current sensor 31 is installed above the breaker group G1, the current sensor 32 is installed between the breaker group G1 and the breaker group G2, and the current sensor 33 is installed between the breaker group G2 and the breaker group G3. Has been done. As a result, the current sensor 31 can measure the current flowing through the breaker groups G1 to G3. On the other hand, the current sensor 32 can measure the current flowing through the breaker groups G2 and G3, and the current sensor 33 can measure the current flowing through the breaker group G3.

  Therefore, in the measuring apparatus 100, for example, the measurement value obtained by using the output of the current sensor 31 is subtracted from the measurement value obtained by using the output of the current sensor 31 to obtain the measurement value for the breaker group G1. be able to. As described above, by using the outputs of the three current sensors 31 to 33, it is possible to obtain the measured value for each of the breaker groups G1, G2, G3.

(1.2.3) Single-Pole Current Sensor In the power measuring system as illustrated in FIG. 3, the core so that the current flowing through each of the two bus conductors 82 can be measured by one current sensor 30. A multi-pole (two-pole) current sensor 30 having two 50 and two detection coils 60 is used. However, the basic structure of the current sensor 30 for the bipolar electrode is the same as that of the current sensor 30 for the unipolar electrode, which has one core 50 and one detection coil 60. The polar current sensor 30 will be described.

  The current sensor 30 includes a body 40 including a first body 41 and a second body 42 as shown in FIG. The current sensor 30 includes a core 50 (see FIG. 1A), a detection coil 60 (see FIG. 1A), a pressing member 90 (see FIG. 1A), and a pressure receiving member 91 (see FIG. 1A) inside a body 40.

  Each of the first body 41 and the second body 42 is made of synthetic resin, and has substantially the same shape and dimensions as the body of the branch breaker 20.

  In the present embodiment, the first body 41 is mounted in the mounting space on the left side of the conductive member 84, and the second body 42 is mounted in the mounting space on the right side of the conductive member 84. That is, the first body 41 and the second body 42 are installed so as to sandwich the conductive member 84 from both sides in the lateral direction. Here, the first body 41 and the second body 42 have the same basic configuration. Therefore, the first body 41 will be mainly described below, but the second body 42 also has the same configuration as the first body 41 unless otherwise specified.

  The first body 41 has a box-shaped container body 403 that is larger in the left-right direction than in the front-rear direction and smaller in the up-down direction than the front-rear direction. Further, the first body 41 has a rectangular tube-shaped tubular portion 404 protruding from a surface (right side surface) of the body 403 that faces the conductive member 84 in the left-right direction. When the pair of tubular portions 404 facing each other in the front-rear direction is a set, at least one set (one set in the example of FIG. 4) of tubular portions 404 is formed in the first body 41. The pair of tubular portions 404 are formed so as to face each other in the front-rear direction with one conductive member (L1 phase conductive member in the example of FIG. 4) 84 interposed therebetween. In other words, one conductive member 84 is inserted between the pair of tubular portions 404.

  Here, when the virtual plane orthogonal to the left-right direction and passing through the center of the conductive member 84 in the lateral direction is set as the reference plane S1, the tip end surface of the tubular portion 404 coincides with the reference plane S1. A similar cylindrical portion 404 is also formed in the second body 42. Therefore, in a state where both the first body 41 and the second body 42 are attached to the cabinet 70, as shown in FIG. 4, the tip end surface of the tubular portion 404 of the first body 41 and the tubular shape of the second body 42 are shown. The tip end surface of the portion 404 comes into contact with the reference surface S1.

  Further, the body 403 is provided with a mounting portion 400 corresponding to the mounting structure 760 for the circuit breaker (for the branch breaker 20) in the cabinet 70. As shown in FIG. 4, the mounting structure 760 has a first holding portion 761 and a second holding portion 762 that project from the front surface of the mounting base 76. The first holding portion 761 and the second holding portion 762 are arranged side by side in the left-right direction so that the first holding portion 761 is on the conductive member 84 side. The first holding portion 761 is formed in a shape that protrudes forward from the front surface of the mounting base 76 and has a tip portion (front end portion) extended toward the second holding portion 762. The second holding portion 762 is made of a spring member having elasticity. The second holding portion 762 is formed in a V-shaped shape that protrudes forward from the front surface of the mounting base 76 and has a central portion that is convex toward the first holding portion 761. A plurality of mounting structures 760 configured in this manner are arranged on both sides of the conductive member 84 in the short-side direction so as to be aligned in the vertical direction.

  In the present embodiment, the first recess 401 and the second recess 402 are formed as the mounting portion 400 corresponding to the mounting structure 760. The first recess 401 is formed in the body 403 at a position corresponding to the first holding portion 761. The second concave portion 402 is formed at a position corresponding to the second holding portion 762 in the body 403.

  When attaching the first body 41 to the attachment base 76, the operator hooks the first holding portion 761 in the first recess 401 of the body 403, and attaches the first holding portion 761 to the side of the body 403 opposite to the conductive member 84. The end (the left end) is pushed backward (on the side of the mounting base 76). As a result, the first holding portion 761 is inserted into the first recess 401 and the second holding portion 762 is inserted into the second recess 402, so that the first body 41 is attached to the attachment base 76. In other words, the first body 41 is attached to the cabinet 70 by the attachment portion 400. On the other hand, when removing the first body 41 from the mounting base 76, the operator bends the second holding portion 762 to the side opposite to the first holding portion 761 while facing the conductive member 84 of the body 403. The end on the side (left end) will be pulled forward. The structure of the mounting portion 400 described above is the same as the mounting portion of the branch breaker 20.

  A cable 64 is pulled out from the first body 41 of the first body 41 and the second body 42. The cable 64 is electrically connected to the detection coil 60 (see FIG. 1A) in the first body 41. A connector 65 for connecting to the measuring device 100 is electrically connected to the tip of the cable 64.

  Next, regarding the configuration of the core 50, the detection coil 60, the pressing member 90, and the pressure receiving member 91 housed in the body 40 having the above-described configuration, and the configuration of the operating member 92, with reference to FIGS. 1A and 1B. explain. 1A, 1B, and FIGS. 6A and 6B to be described later are enlarged views in which a part of the body 40 is cut away, which represents a portion corresponding to “X1” in FIG. 4.

  The core 50 is made of, for example, a magnetic material such as a silicon steel plate. The core 50 is held by the body 40 and forms a closed magnetic path surrounding one conductive member (L1 phase conductive member in the example of FIG. 1A) 84. Specifically, the core 50 is formed so that the cross-sectional shape orthogonal to the vertical direction is a rectangular frame shape that is long in the horizontal direction. In other words, the core 50 is formed in a flat shape having a lateral dimension larger than a longitudinal dimension.

  The core 50 is divided into a first core 51 and a second core 52 in the left-right direction. The first core 51 has a center piece 512 extending in the front-rear direction and a pair of leg pieces 513 protruding rightward from both ends of the center piece 512 in the front-rear direction. The tip portions (right end portions) of the pair of leg pieces 513 correspond to the end portions 511 of the first core 51, respectively. Similarly, the second core 52 has a center piece 522 extending in the front-rear direction and a pair of leg pieces 523 protruding leftward from both ends of the center piece 522 in the front-rear direction. The tip portions (right end portions) of the pair of leg pieces 523 correspond to the end portions 521 of the second core 52, respectively. Therefore, the end portion 511 of the first core 51 and the end portion 521 of the second core 52 are abutted against each other in a predetermined facing direction (left-right direction), so that there is a gap between the first core 51 and the second core 52. A through space 500 through which the conductive member 84 penetrates is formed.

  The first core 51 is held in the first body 41 by being housed in the first body 41. Here, the central piece 512 is housed in the container body 403 of the first body 41, and the pair of leg pieces 513 is housed in the pair of tubular portions 404 of the first body 41, respectively. As a result, the end portion 511 of the first core 51 is exposed to the outside of the first body 41 through the opening of the tubular portion 404. Similarly, the second core 52 is held in the second body 42 by being housed in the second body 42. Here, the central piece 522 is housed in the container body 403 of the second body 42, and the pair of leg pieces 523 is housed in the pair of tubular portions 404 of the second body 42, respectively. As a result, the end portion 521 of the second core 52 is exposed to the outside of the second body 42 through the opening of the tubular portion 404.

  Here, at least one of the first core 51 and the second core 52 constitutes a movable core on which the pressing force from the pressing member 90 acts. In the present embodiment, the second core 52 is a movable core. The movable core (second core 52) is not fixed to the body 40 (second body 42) but is relatively fixed to the body 40 (second body 42) along the facing direction (left-right direction). Can be moved to. However, the movement of the second core 52 with respect to the second body 42 is restricted except in the facing direction. On the other hand, the first core 51, which is not a movable core, is fixed to the body 40 (first body 41).

  Further, the leg piece 523 of the second core 52, which is a movable core, is set to have a larger dimension in the left-right direction than the leg piece 513 of the first core 51. Therefore, in the state of FIG. 1A, the distal end surface (right end surface) of the leg piece 513 of the first core 51 and the distal end surface (right end surface) of the tubular portion 404 are flush, whereas the second core 52 is. End portion 521 of the cylindrical portion 404 projects from the tip end surface (left end surface) of the tubular portion 404.

  A detection coil 60 is wound around at least a part of the core 50. As a result, the current sensor 30 functions as a CT (Current Transformer) sensor that outputs an electric signal corresponding to the current flowing through the conductive member 84 surrounded by the core 50 from the detection coil 60. In the present embodiment, as an example, the detection coil 60 is divided into a first coil 61 and a second coil 62. The first coil 61 is wound around one of the pair of leg pieces 513 of the first core 51, and the second coil 62 is wound around the other of the pair of leg pieces 513 of the first core 51. The first coil 61 and the second coil 62 are electrically connected in series.

  The pressing member 90 is provided inside the second body 42 that holds the second core 52. The pressing member 90 is arranged on the opposite side of the second core 52, which is the movable core, from the through space 500 in the facing direction (left-right direction). At least in the state shown in FIG. 1B, the pressing member 90 elastically deforms the second core 52, which is the movable core, by pressing the second core 52, which is the movable core, against the first core 51 (leftward in this case). Is a member that acts on. Therefore, the pressing member 90 is made of an elastically deformable member, that is, a member having elasticity (spring property). In the present embodiment, as an example, the pressing member 90 is a coil spring. The pressing member 90 is arranged to the right of the central piece 522 of the second core 52. The movement of the pressing member 90 in the direction (front-back direction and up-down direction) orthogonal to the facing direction is restricted by, for example, a restricting piece provided on the body 403 or the second core 52.

  The pressure receiving member 91 is arranged at a position opposite to the second core 52 with respect to the pressing member 90 in the facing direction. In other words, the pressure receiving member 91 is arranged so as to sandwich the pressing member 90 between the pressure receiving member 91 and the second core 52 which is the movable core. The pressure receiving member 91 has a pressure receiving surface 911 at a position facing the second core 52, which is a movable core, in the facing direction. The pressure receiving surface 911 is a surface for contacting an end surface (right end surface) of the pressing member 90 on the opposite side to the second core 52 and receiving a reaction force from the pressing member 90. In the present embodiment, the surface of the pressure receiving member 91 facing the left side, that is, the left side surface of the pressure receiving member 91 constitutes the pressure receiving surface 911. Therefore, the pressing member 90 is sandwiched between the right side surface of the central piece 522 of the second core 52, which is a movable member, and the pressure receiving surface 911 of the pressure receiving member 91, and between the second core 52 and the pressure receiving member 91. Held in.

  The pressure receiving member 91 is formed in an elliptic cylinder shape as shown in FIGS. 5A and 5B. The pressure receiving member 91 is made of synthetic resin, for example. The pressure receiving member 91 is configured to be rotatable about a rotation center line C1 along the front-rear direction. The relative position of the rotation center line C1 with respect to the body 403 is fixed. The rotation center line C1 shown in FIGS. 5A and 5B is an imaginary line for showing the rotation center of the pressure receiving member 91 and does not have a substance. 5A and 5B, only the second core 52, the pressing member 90, the pressure receiving member 91, and the operating member 92 are shown. 5A and 5B, the positions of the pressing member 90, the pressure receiving member 91, and the operating member 92 when the pressure receiving surface 911 is at the first position are shown by imaginary lines (two-dot chain line).

  Since the pressure receiving member 91 has an elliptical cross section, when the pressure receiving member 91 rotates about the rotation center line C1, the distance from the rotation center line C1 to the pressure receiving surface 911 (the left side surface of the pressure receiving member 91) changes. As a result, as shown in FIGS. 1A and 1B, the distances L1 and L2 between the second core 52, which is a movable core, and the pressure receiving surface 911 change. 1A shows the current sensor 30 with the pressure receiving surface 911 in the first position, and FIG. 1B shows the current sensor 30 with the pressure receiving surface 911 in the second position. Here, the second position is a position where the pressure receiving surface 911 is closer to the second core 52 that is the movable core than the first position. That is, the distance L2 between the second core 52 and the pressure receiving surface 911 in FIG. 1B is shorter than the distance L1 between the second core 52 and the pressure receiving surface 911 in FIG. 1A (L2<L1).

  The operating member 92 can be operated by moving the pressure receiving member 91 so as to move the position of the pressure receiving surface 911 in the facing direction from the first position to the second position. In the present embodiment, the operation member 92 is held by the body 40 so that at least a part thereof protrudes from the surface of the body 40. Specifically, the operating member 92 is an elliptic cylindrical member that extends forward from the front end surface of the pressure receiving member 91 and is formed integrally with the pressure receiving member 91. In other words, one elliptic cylinder-shaped member serves as the pressure receiving member 91 and the operating member 92, and a portion of this member protruding from the surface of the body 40 functions as the operating member 92. An operation hole 410 for allowing the operation member 92 to protrude from the front surface of the body 403 is formed in the body 403 of the second body 42. That is, the operating member 92 projects from the front surface of the second body 42 through the operating hole 410 of the second body 42.

  As a result, the operation member 92 can be operated outside the body 40. When the operating member 92 is operated so as to rotate about the rotation center line C1, the pressure receiving member 91 moves (rotates) together with the operating member 92. Hereinafter, the state of the operating member 92 when the pressure receiving surface 911 is at the first position is referred to as a non-operating state, and the state of the operating member 92 when the pressure receiving surface 911 is at the second position is referred to as an operating state. The operating member 92 is brought into the operating state by being operated so as to rotate 90 degrees about the rotation center line C1 from the non-operating state. Therefore, as the operating member 92 is operated from the non-operating state to the operating state, the pressure receiving surface 911 of the pressure receiving member 91 moves from the first position (see FIG. 1A) to the second position (see FIG. 1B). To do. The operation member 92 can be operated from the operated state to the non-operated state.

  Next, an operation of attaching the current sensor 30 having the above-described configuration to the cabinet 70 by an operator will be described.

  As shown in FIG. 1A, the worker first attaches the body 40 to the cabinet 70 with the pressure receiving surface 911 in the first position, that is, with the operating member 92 in the non-operating state. In this state, the pressing member 90 does not apply a pressing force to the second core 52, which is a movable core, in a direction in which the second core 52 is pressed against the first core 51.

  Then, the operator moves the pressure receiving surface 911 from the first position to the second position by operating the operating member 92 from the non-operating state to the operating state to rotate the pressure receiving member 91. At this time, the pressure receiving surface 911 moves toward the second core 52. Therefore, as shown in FIG. 1B, when the pressure receiving surface 911 is in the first position, the pressing member 90 sandwiched between the second core 52, which is a movable member, and the pressure receiving surface 911 of the pressure receiving member 91 is compressed and elastic. It will be transformed. Then, the pressing member 90 is elastically deformed to exert a pressing force to the left on the second core 52.

  As described above, the worker operates the operating member 92 by operating the operating member 92 after attaching the body 40 to the cabinet 70, so that the pressing member 90 is pressed against the second core 52 that is the movable core. The pressing force can be applied from. As a result, the end portion 521 of the second core 52 exposed from the second body 42 is pressed against the end portion 511 of the first core 51 exposed from the first body 41. Therefore, the end 511 of the first core 51 and the end 521 of the second core 52 are in contact with each other, and an air gap is less likely to be formed between the first core 51 and the second core 52.

(1.2.4) Bipolar Current Sensor As shown in FIGS. 6A and 6B, the bipolar current sensor 30 includes a core 50, a detection coil 60, and a pressing member 90 for one body 40. A plurality of combinations with the pressure receiving member 91 are provided. The current sensor 30 shown in FIGS. 6A and 6B includes two cores 50, a detection coil 60, a pressing member 90, and a pressure receiving member 91 so that the currents of the two conductive members 84 of the L1 phase and the L2 phase can be measured. It is a current sensor 30 for two poles provided for each. In FIG. 6A and FIG. 6B, regarding the constituent elements such as the core 50, the detection coil 60, the pressing member 90, and the pressure receiving member 91, the constituent elements corresponding to the conductive member 84 of the L1 phase have “A” added to the end of the reference numeral. However, the component corresponding to the L2-phase conductive member 84 is suffixed with “B”.

  The shape of the body 40 of the current sensor 30 for bipolar is the same as that of the body 40 of the current sensor 30 for unipolar, except that a plurality of sets of tubular portions 404 are provided so as to correspond to the cores 50. is there.

  In the multipolar current sensor 30, only one operating member 92 is provided as in the single pole current sensor 30. The operation member 92 is configured to collectively move the plurality of pressure receiving members 91A and 91B. Specifically, in the multipolar current sensor 30, a plurality of pressure receiving members 91A and 91B are formed integrally with one operating member 92. In other words, one elliptic cylindrical member serves as the plurality of pressure receiving members 91A and 91B and the operating member 92, and a portion of this member protruding from the surface of the body 40 functions as the operating member 92.

  However, the operation member 92 collectively moving the plurality of pressure receiving members 91</b>A and 91</b>B is not an indispensable configuration of the current sensor 30 for bipolar, but a plurality of operations corresponding to the plurality of pressure receiving members 91</b>A and 91</b>B. The member 92 may be provided.

  The multipolar current sensor 30 is not limited to the two conductive members 84 of the L1 phase and the L2 phase, for example, the two conductive members 84 of the L1 phase and the N phase, and the two conductive members of the L2 phase and the N phase. The structure corresponding to the member 84 may be used. Further, the multipolar current sensor may have a configuration corresponding to the three conductive members 84.

(1.3) Effects According to the current sensor 30 of the present embodiment described above, the body 40 is attached to the cabinet 70 so that the conductive member 84 is sandwiched between the first core 51 and the second core 52. The current flowing through the conductive member 84 can be measured using the output of the detection coil 60. Therefore, in this current sensor 30, in order to measure the current flowing through the conductive member 84, it is not necessary to electrically connect the conductive member 84, which is the current measurement target, to the current sensor 30. Therefore, the current sensor 30 of the present embodiment has an advantage that the mounting work is easy.

  Further, according to the current sensor 30, since the body 40 holding the core 50 is attached to the cabinet 70, it is possible to suppress the decrease in the current measurement accuracy due to the variation of the relative position of the core 50 with respect to the conductive member 84. it can.

  Further, since the pressing member 90 presses the first core 51 and the second core 52 against each other, it is possible to suppress a decrease in current measurement accuracy due to an air gap generated between the first core 51 and the second core 52. .. That is, when an air gap is generated between the first core 51 and the second core 52, the magnetic resistance of the closed magnetic circuit formed by the core 50 changes according to the size of the air gap. If the magnetic resistance of the closed magnetic circuit varies, the output (electrical signal) of the detection coil 60 varies even if the magnitude of the current flowing through the conductive member 84 is the same, leading to a reduction in the current measurement accuracy. In the current sensor 30 of the present embodiment, the first core 51 and the second core 52 are pressed against each other to prevent an air gap from occurring, and thus such variations in magnetic resistance are unlikely to occur, and as a result, It is possible to suppress a decrease in current measurement accuracy.

  Particularly, in the flat core 50 as in the present embodiment, the distance between both end portions 511 of the first core 51 and the distance between both end portions 521 of the second core 52 are short, so that The air gap between the second core 52 and the second core 52 is easily connected to the leakage magnetic flux. That is, in the flat core 50, the air gap that divides the closed magnetic circuit in the longitudinal direction of the core 50 has a great influence on the current measurement accuracy. Therefore, in the current sensor 30 including the flat core 50, the configuration in which an air gap is unlikely to occur between the first core 51 and the second core 52 as in the present embodiment is particularly useful.

  Further, according to the current sensor 30, when the pressure receiving surface 911 moves from the first position to the second position, the pressing member 90 is compressed between the pressure receiving surface 911 and the movable core (second core 52), and the pressing member 90 is pressed. Exerts a pressing force on the movable core. Here, the movement of the pressure receiving surface 911 from the first position to the second position is performed by operating the operation member 92. Therefore, an operator who attaches the current sensor 30 can perform an operation for operating the operation member 92 to apply the pressing force to the movable core, in addition to the operation for attaching the body 40 to the cabinet 70. .. As a result, the pressing force can be reliably applied to the movable core, and an air gap is less likely to occur between the first core 51 and the second core 52.

  Further, as in the present embodiment, it is preferable that the operation member 92 be held by the body 40 so that at least a part thereof protrudes from the surface of the body 40. In this case, it is preferable that the pressure receiving surface 911 is configured to move from the first position to the second position by operating at least a part of the operating member 92. According to this configuration, since the operating member 92 can be operated outside the body 40, an operator can operate the operating member 92 without using a tool or the like, and the pressing member 90 presses the movable core. Workability of work for exerting force is improved.

  Further, as in the above-described current sensor 30 for bipolar electrodes, a plurality of combinations of the core 50, the detection coil 60, the pressing member 90, and the pressure receiving member 91 may be provided for one body 40. In this case, it is preferable that the operating member 92 is configured to move the plurality of pressure receiving members 91 at once. According to this configuration, for example, in the electric power measurement system as shown in FIG. 3, the current flowing through each of the plurality of bus conductors 82 can be simultaneously measured by one current sensor 30. Moreover, it is possible to move the plurality of pressure receiving members 91 all at once by operating only one operation member 92, and to apply the pressing force from the plurality of pressing members 90 to the plurality of movable cores all at once. As a result, workability of the work for applying the pressing force from the plurality of pressing members 90 to the plurality of movable cores is improved.

  Further, like the present embodiment, the distribution board 1 preferably includes the current sensor 30 and the cabinet 70 having the mounting structure 760 to which the body 40 is mounted. According to this configuration, there is an advantage that the work of mounting the current sensor 30 is simple.

(1.4) Modifications Modifications of the first embodiment will be listed below.

  It suffices for the operation member 92 to be operable so as to move the position of the pressure receiving surface 911 in the facing direction from the first position to the second position by moving the pressure receiving member 91. For example, a screw structure, a slide structure, or the like. The specific mode of the operating member 92 can be changed as appropriate. 7A and 7B show the main parts of the current sensor 30 according to the modification of the first embodiment. In the example of FIGS. 7A and 7B, the pressure receiving member 91C and the operating member 92C are integrally formed, and are configured to be linearly movable along the front-rear direction. The pressure receiving member 91C has a step portion 912C formed on a left side surface (a surface facing the second core 52) forming the pressure receiving surface 911C, which is a taper surface inclined toward the left rear. The distance from the pressure receiving surface 911C to the second core 52 is shorter in a portion in front of the step portion 912C (on the operation hole 410 side) than in a portion behind the step portion 912C (on the side opposite to the operation hole 410). Is becoming In this modification, the pressure receiving member 91C moves rearward as the operation member 92C is pushed rearward, and the pressure receiving surface 911C moves from the first position shown in FIG. 7A to the second position shown in FIG. 7B. .

  As still another example, the operating member 92 and the pressure receiving member 91 may be separate bodies. In this case, a power transmission mechanism may be provided between the pressure receiving member 91 and the operating member 92 so that the pressure receiving member 91 interlocks with the operating member 92. The power transmission mechanism is realized by, for example, a link mechanism or a gear.

  Further, the operation member 92 may be at least operable to move the position of the pressure receiving surface 911 from the first position to the second position, and moves the position of the pressure receiving surface 911 from the second position to the first position. Whether or not such an operation is possible can be appropriately changed. That is, the operation member 92 may only be able to perform the operation of moving the position of the pressure receiving surface 911 from the first position to the second position.

  The material of the core 50 is not limited to the silicon steel plate, and may be, for example, permalloy, ferrite, amorphous, nanocrystalline alloy, or the like.

  Further, the detection coil 60 may not be divided into the first coil 61 and the second coil 62. Further, the detection coil 60 is not limited to the pair of leg pieces 513, but may be wound around the center piece 512, for example.

  Further, the detection coil 60 may be incorporated in the body 40 together with the core 50 in a state of being wound around the core 50, or may be embedded in the body 40. The detection coil 60 may be wound around a coil bobbin attached to the core 50. 1A and 1B and the like, a part of the detection coil 60 is illustrated as being embedded in the body 40, but these drawings are merely conceptual diagrams and the detection coil 60 is embedded in the body 40. It is not intended to be limited to the specific configuration.

  Further, the current sensor 30 for a single pole is not limited to the configuration corresponding to the L1 phase conductive member 84 as exemplified in the first embodiment, but may be a core corresponding to, for example, the L2 phase or N phase conductive member 84. 50, the detection coil 60, and the pressing member 90 may be provided.

  Further, the operating member 92 does not have to project from the surface of the body 40, and the entire operating member 92 may be housed inside the body 40. In this case, the operator can operate the operation member 92 by inserting a tool such as a flat-blade screwdriver into the body 40 through the operation hole 410 of the body 40. However, even if at least a part of the operating member 92 projects from the surface of the body 40, the operating member 92 may be operated by a tool such as a flat-blade screwdriver or pliers.

  Further, the pressing member 90 has a pressing force in a direction in which the first core 51 and the second core 52 are pressed against each other by elastic deformation with respect to the movable core formed of at least one of the first core 51 and the second core 52. Any member may be used as long as it acts. Therefore, the pressing member 90 is not limited to the coil spring, and may be a leaf spring made of synthetic resin or metal, for example. Further, the pressing member 90 may be formed integrally with the pressure receiving member 91.

  Further, the pressing member 90 may be provided on the first body 41 so as to exert a force on the first core 51. In this case, the pressure receiving member 91 and the operating member 92 are similarly provided on the first body 41. Further, the pressing member 90 may be provided on both the first body 41 and the second body 42 so as to exert a force on both the first core 51 and the second core 52. In this case, the pressure receiving member 91 and the operating member 92 are similarly provided on both the first body 41 and the second body 42.

  Further, the pressing member 90 is not limited to the movable core not only when the pressure receiving surface 911 is at the second position (see FIG. 1B) but also when the pressure receiving surface 911 is at the first position (see FIG. 1A). The pressing force may be applied. That is, the pressing member 90 may apply the pressing force to the movable core at least when the pressure receiving surface 911 is in the second position. When the pressure receiving surface 911 is in the first position, the pressing member 90 may or may not exert a pressing force on the movable core. When the pressing force is applied to the movable core from the pressing member 90 with the pressure receiving surface 911 in the first position, the pressure receiving surface 911 moves from the first position to the second position, so that the pressing member 90 moves to the movable core. The pressing force that acts increases.

  Further, the first body 41 and the second body 42 may be configured to hold the first core 51 and the second core 52, respectively. It may be protruding. For example, the first body 41 and the second body 42 may not have the tubular portion 404, and the leg pieces 513 of the first core 51 and the leg pieces 523 of the second core 52 may protrude from the body 40.

  The current sensor 30 is not limited to the distribution board 1 for single-phase three-wire wiring, but may be applied to the distribution board 1 for three-phase three-wire wiring, for example. In this case, the current sensor 30 is configured to measure the current flowing through the conductive member 84 of any one of the R phase, the S phase, and the T phase.

(Embodiment 2)
In the current sensor 30A according to the present embodiment, as shown in FIG. 8, the first body 41A has a mounting portion 400 corresponding to the mounting structure 760 for the circuit breaker in the cabinet 70, and the cabinet 70 is mounted by the mounting portion 400. Attached to. On the other hand, the second body 42A is attached to the cabinet 70 together with the first body 41A by being coupled to the first body 41A. Hereinafter, the same components as those in the first embodiment will be denoted by the same reference numerals and the description thereof will be appropriately omitted.

  In the current sensor 30A of the present embodiment, only the first body 41A of the first body 41A and the second body 42A has the mounting portion 400 similar to that of the branch breaker 20. The second body 42A is integrated with the first body 41A by being coupled to the first body 41A. That is, the second body 42A is attached to the cabinet 70 via the first body 41A by attaching the first body 41A to the cabinet 70. Therefore, in the present embodiment, the body 40A is attached to the cabinet 70 only when the second body 42A is coupled to the first body 41A and the first body 41A is attached to the cabinet 70.

  Further, in the present embodiment, the mounting structure 760 in the cabinet 70 has a first holding portion 761 and a second holding portion 762 that are separated in the facing direction. The first body 41A has a fixed block 420 and a movable block 421. The fixed block 420 holds the first core 51 and is fixed to the first holding portion 761. The movable block 421 is fixed to the second holding portion 762. The movable block 421 is movable relative to the fixed block 420 between the fixed position and the release position. The fixed position here is the position of the movable block 421 when the movable block 421 is fixed to the second holding portion 762. The release position is the position of the movable block 421 when the fixation of the movable block 421 to the second holding portion 762 is released.

  Specifically, the first body 41A is divided into a fixed block 420 and a movable block 421 in the facing direction (horizontal direction). The first body 41A is attached to the attachment base 76 so that the fixed block 420 holding the first core 51 faces the conductive member 84. The fixed block 420 has a rectangular tube-shaped tubular portion 404 protruding from a surface (right side surface) of the fixed block 420 facing the conductive member 84 in the left-right direction. In the example of FIG. 8, the fixed block 420 is formed with four tubular portions 404 arranged in the front-rear direction. One conductive member 84 is inserted between each of the two tubular portions 404 facing each other in the front-rear direction. In the fixed block 420, of the first recess 401 and the second recess 402 that form the mounting portion 400, only the first recess 401 corresponding to the first holding portion 761 is formed.

  The movable block 421 is formed in a plate shape. The movable block 421 is coupled to the fixed block 420 by the shaft portion 422. The shaft portion 422 is located at the left rear corner of the fixed block 420. The movable block 421 is configured to be rotatable about the shaft portion 422 with respect to the fixed block 420. The movable block 421 rotates between the fixed position and the release position described above. In FIG. 8, the movable block 421 at the fixed position is shown by a solid line, and the movable block 421 at the release position is shown by an imaginary line (two-dot chain line). In the movable block 421, only the second concave portion 402 corresponding to the second holding portion 762 is formed among the first concave portion 401 and the second concave portion 402 that form the mounting portion 400.

  In this configuration, the first body 41A can switch between a state in which it is fixed to the cabinet 70 and a state in which it is not fixed to the cabinet 70 as the movable block 421 rotates (moves). That is, when the movable block 421 is in the fixed position, the first body 41A is fixed to the cabinet 70, and when the movable block 421 is in the released position, the first body 41A is not fixed to the cabinet 70.

  Next, in the current sensor 30A of the present embodiment, a specific configuration for coupling the second body 42A to the first body 41A will be described with reference to FIGS. 8 and 9.

  The first body 41A further includes a plurality of (four in this case) protruding portions 423 protruding from the tip end surface (right end surface) of the tubular portion 404 in the facing direction (left-right direction). The four protrusions 423 are arranged at the four corners of the first body 41A in a right side view of the first body 41A. Four coupling grooves 430 into which four protrusions 423 are inserted are formed in the second body 42A. By inserting the four protrusions 423 into the four coupling grooves 430, the movement of the second body 42A in the direction (front-back direction and vertical direction) orthogonal to the facing direction is restricted with respect to the first body 41A. ..

  Further, the first body 41A is formed with a first coupling hole 424 that penetrates in one direction orthogonal to the facing direction. The second body 42A is formed with a second coupling hole 425 which penetrates in the one direction and is continuous with the first coupling hole 424 in the one direction. The current sensor 30A further includes a coupling member 426. The coupling member 426 is inserted into the first coupling hole 424 and the second coupling hole 425 while straddling the first coupling hole 424 and the second coupling hole 425. The second body 42A is joined to the first body 41A by a joining member 426.

  In the example of FIGS. 8 and 9, the first coupling hole 424 is formed in each of the four protrusions 423. The four first coupling holes 424 are holes that penetrate the protrusion 423 in the front-rear direction. The second coupling hole 425 is formed in the side wall of each of the four coupling grooves 430 in the second body 42A. Each of the four second coupling holes 425 is a hole that penetrates the sidewall of the coupling groove 430 in the front-rear direction. In the state where the four protrusions 423 are inserted into the four coupling grooves 430, the four first coupling holes 424 and the four second coupling holes 425 are continuous in the front-rear direction. In this state, the coupling member 426 is inserted into the continuous first coupling hole 424 and the second coupling hole 425, so that the coupling member 426 functions as a winder and faces the first body 41A in the facing direction (left-right direction). The movement of the second body 42A to the) is restricted.

  Here, of the four protrusions 423, the pair of coupling members 426 corresponding to the pair of protrusions 423 located at the front end of the first body 41A are connected to one lever 427A. Similarly, the pair of coupling members 426 corresponding to the pair of protrusions 423 located at the rear end of the first body 41A are connected to one lever 427B. The pair of levers 427A and 427B are arranged to face each other in the front-rear direction, and the lever 427A is located in front of the lever 427B. At least a part of the pair of levers 427A and 427B projects from the surface of the second body 42A through the opening 428 formed in the second body 42A. The opening 428 is formed on a surface (right side surface) of the second body 42A opposite to the first body 41A in the facing direction.

  Further, in the second body 42A, a return member 429 is arranged between the lever 427A and the lever 427B. The return member 429 is formed of, for example, a coil spring, and is sandwiched between the lever 427A and the lever 427B to apply a force to the levers 427A and 427B so as to separate the lever 427A and the lever 427B from each other.

  According to the above configuration, the worker first attaches the first body 41A with the movable block 421 in the release position to the cabinet 70. At this time, the first body 41A is temporarily fixed to the cabinet 70 by hooking the first holding portion 761 in the first recess 401. With the first body 41A temporarily fixed to the cabinet 70, the first body 41A is not fixed to the cabinet 70, and the first body 41A is positioned with respect to the cabinet 70. Then, the operator rotates the movable block 421 to the fixed position. At this time, the first body 41A is permanently fixed to the cabinet 70 by inserting the second holding portion 762 into the second recess 402. In the state where the first body 41A is permanently fixed to the cabinet 70, the first body 41A is fixed to the cabinet 70.

  Next, the worker joins the second body 42A to the first body 41A that is permanently fixed to the cabinet 70. At this time, the operator holds the pair of levers 427A and 427B so that the levers 427A and 427B approach each other so that the four protrusions 423 are inserted into the four coupling grooves 430. The second body 42A is attached to 41A. After that, the operator releases the pair of levers 427A and 427B to move the levers 427A and 427B in a direction in which the levers 427A and 427B are separated from each other by the return member 429, and the first coupling hole 424 and the second coupling hole 425 are moved. Then, the coupling member 426 is inserted.

  According to the configuration of the present embodiment described above, since the second body 42A is directly coupled to the first body 41A, the relative displacement between the first body 41A and the second body 42A occurs. It gets harder. That is, as compared with the configuration in which the first body 41 and the second body 42 are individually attached to the cabinet 70 as in the first embodiment, in the present embodiment, the relative position between the first body 41A and the second body 42A. It is unlikely to cause misalignment. Moreover, since the first body 41A has the mounting portion 400 corresponding to the mounting structure 760 for the circuit breaker in the cabinet 70, it is not necessary to provide a new mounting structure for mounting the current sensor 30.

  In addition, as in the present embodiment, the mounting structure 760 in the cabinet 70 preferably has a first holding portion 761 and a second holding portion 762 that are separated in the facing direction. In this case, the first body 41A preferably has a fixed block 420 that holds the first core 51 and is fixed to the first holding portion 761, and a movable block 421 that is fixed to the second holding portion 762. In this case, the movable block 421 is fixed between the fixed position where the movable block 421 is fixed to the second holding portion 762 and the release position where the fixing of the movable block 421 to the second holding portion 762 is released. It is preferably movable relative to 420. According to this configuration, the worker divides the attachment of the first body 41A to the cabinet 70 into two stages of temporary fixing of the first body 41A to the cabinet 70 and final fixing of the first body 41A to the cabinet 70. It can be carried out. Therefore, the positioning accuracy of the first body 41A with respect to the cabinet 70 is improved. Further, when the movable block 421 is in the release position, the first body 41A can introduce the conductive member 84 between the two tubular portions 404 facing each other in the front-rear direction while sliding along the facing direction. Therefore, interference between the tubular portion 404 and the conductive member 84 is unlikely to occur, and the attachment of the first body 41A to the cabinet 70 becomes easy. However, this configuration is not essential for the current sensor 30A, and the first body 41A may not be divided into the fixed block 420 and the movable block 421 as in the case of the current sensor 30 of the first embodiment.

  As in the present embodiment, the first body 41A is formed with the first coupling hole 424 penetrating in one direction orthogonal to the facing direction, and the second body 42A is penetrating in the one direction and is formed in the one direction. It is preferable that a second coupling hole 425 is formed that is continuous with the first coupling hole 424 in the direction. In this case, the current sensor 30A further includes a coupling member 426 that is inserted into the first coupling hole 424 and the second coupling hole 425, straddling the first coupling hole 424 and the second coupling hole 425, and the second body 42A is It is preferably coupled to the first body 41A by a coupling member 426. With this configuration, the first body 41A and the second body 42A can be coupled with a relatively simple configuration, and a robust coupling state can be achieved. However, this configuration is not an essential configuration for the current sensor 30A, and for example, the first body 41A and the second body 42A are coupled by a so-called snap fit structure that utilizes the elasticity of the first body 41A or the second body 42A itself. May be done.

  As a modified example of the second embodiment, the second body 42, not the first body 41, has the mounting portion 400 corresponding to the mounting structure 760 (see FIG. 8) for the circuit breaker in the cabinet 70, and the mounting portion 400. It may be configured to be attached to the cabinet 70 by. In this modification, the first body 41 is attached to the cabinet 70 together with the second body 42 by being coupled to the second body 42. Also in this modification, as in the second embodiment, there is an effect that the relative displacement between the first body 41 and the second body 42 is unlikely to occur.

  The configuration (including the modified example) described in the second embodiment can be applied by appropriately combining with the configuration (including the modified example) described in the first embodiment.

1 distribution board 20 branch breaker (circuit breaker)
30, 30A Current sensor 40, 40A Body 41, 41A First body 42, 42A Second body 50, 50A, 50B Core 51, 51A, 51B First core 52, 52A, 52B Second core 60, 60A, 60B Detection coil 70 Cabinet 84 Conductive member 90, 90A, 90B Pressing member 91, 91A, 91B, 91C Pressure receiving member 911, 911A, 911B, 911C Pressure receiving surface 92, 92C Operating member 400 Mounting portion 420 Fixed block 421 Movable block 424 First coupling hole 425 Second coupling hole 426 Coupling member 500 Through space 511 End of first core 521 End of second core 760 Mounting structure 761 First holding part 762 Second holding part

Claims (7)

With a body that can be attached to the cabinet of the distribution board,
A core that is held by the body and forms a closed magnetic circuit that surrounds a flat plate-shaped conductive member provided on the distribution board;
A detection coil that is wound around the core and outputs an electric signal according to a current flowing through the conductive member,
The body has a first body and a second body,
The core includes a first core held by the first body and a second core held by the second body, and an end portion of the first core and the second core in a predetermined facing direction. By abutting the end portions of each other with each other, a through space through which the conductive member penetrates is formed between the first core and the second core,
An elastically deformable pressing member, which is arranged on the opposite side of the through space in the facing direction with respect to the movable core formed of at least one of the first core and the second core,
A pressure receiving member that is disposed so as to sandwich the pressing member between the movable core and the movable core, and has a pressure receiving surface that faces the movable core in the facing direction;
An operating member operable to move the pressure receiving member to move the position of the pressure receiving surface in the facing direction from a first position to a second position closer to the movable core than the first position; A current sensor, further comprising: The operation member is held by the body so that at least a part of the operation member protrudes from the surface of the body,
The current sensor according to claim 1, wherein the pressure receiving surface is configured to move from the first position to the second position by operating at least a part of the operation member. .. A plurality of combinations of the core, the detection coil, the pressing member, and the pressure receiving member are provided for one body.
The current sensor according to claim 1 or 2, wherein the operating member is configured to collectively move the plurality of pressure receiving members. The first body has a mounting portion corresponding to a mounting structure for a circuit breaker in the cabinet, and is mounted to the cabinet by the mounting portion,
The current sensor according to any one of claims 1 to 3, wherein the second body is attached to the cabinet together with the first body by being coupled to the first body. A first coupling hole is formed in the first body, the first coupling hole penetrating in one direction orthogonal to the facing direction;
A second coupling hole is formed in the second body, the second coupling hole penetrating in the one direction and being continuous with the first coupling hole in the one direction;
Further comprising a coupling member that is inserted into the first coupling hole and the second coupling hole across the first coupling hole and the second coupling hole,
The current sensor according to claim 4, wherein the second body is coupled to the first body by the coupling member. The mounting structure in the cabinet has a first holding portion and a second holding portion that are separated in the facing direction,
The first body has a fixed block that holds the first core and is fixed to the first holding portion, and a movable block that is fixed to the second holding portion,
The movable block is fixed to the fixed block between a fixed position where the movable block is fixed to the second holding portion and a release position where the fixed state of the movable block to the second holding portion is released. 6. The current sensor according to claim 4, wherein the current sensor is relatively movable. A distribution board comprising: the current sensor according to any one of claims 1 to 6; and the cabinet having a mounting structure to which the body is mounted.

Images