JP2016192825A - Current sensor and distribution switchboard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a current sensor and a distribution switchboard that are simple in installation work.SOLUTION: A current sensor 30 includes a first case 40 and a second case 50. As in the case of a circuit breaker for a distribution switchboard, the first case 40 has a recess 41 in which a pawl 761 provided to a mounting base 76 of the distribution switchboard is inserted, and a recess portion 42 in which a hook spring 762 provided to the mounting base 76 is inserted. The first case 40 is secured to the distribution switchboard using the recesses 41, 42. The second case 50 is freely detachably secured to the first case 40. The first case 40 and the second case 50 is housed therein a current measuring unit for measuring current flowing through a conductive bar 84 to which the circuit breaker for the distribution switchboard is connected.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a current sensor and a distribution board, and more particularly to a current sensor and a distribution board that are used by being attached to a cabinet of the distribution board.

  Conventionally, there has been a distribution board in which a main breaker, a branch breaker, and a terminal block connected to the secondary side of the branch breaker are housed inside a panel body (see, for example, Patent Document 1).

  The terminal block described in Patent Document 1 connects a primary terminal connected to a load-side terminal of a branch breaker, a secondary terminal to which an external load is connected, and the primary terminal and the secondary terminal. A current transformer for measuring a current flowing through the conductive block. The terminal block is connected to the secondary side of the branch breaker and measures the current supplied from the branch breaker to the external load.

JP 2011-36034 A

  In the distribution board described in Patent Document 1, a branch breaker and a terminal block connected to a load-side terminal of the branch breaker are arranged one by one on an intermediate plate provided inside the board body. . Therefore, when measuring the current supplied to the external load from a plurality of branch breakers, a branch breaker (circuit breaker for distribution board) is connected to each of a plurality of middle plates provided inside the panel body (cabinet). It was necessary to attach a terminal block. Therefore, there is a problem that it takes time to install a terminal block (current sensor).

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

  The current sensor of the present invention has a mounting portion similar to a circuit breaker for a distribution board, a case attached to the distribution board using the mounting portion, and a circuit breaker for the distribution board held by the case And a current measuring unit for measuring a current flowing through the conductive member to which the device is connected.

  A distribution board according to the present invention includes the current sensor and a cabinet that houses the current sensor and the circuit breaker for the distribution board.

  According to the present invention, it is possible to provide a current sensor and a distribution board that can be easily mounted.

It is a front view of the distribution board of an embodiment. It is a block diagram which shows the circuit structure of the electricity distribution panel of embodiment. It is the side view which looked at the state where the current sensor was attached to the attachment base with which the distribution board of an embodiment is provided from the lower side. It is the side view which looked at the attachment base with which the distribution board of embodiment is provided from the lower side. 5A is a side view of the current sensor according to the embodiment as viewed from below, and FIG. 5B is a side view of the state when the current sensor of the embodiment is separated as viewed from below. 6A is a front view of the current sensor of the embodiment, and FIG. 6B is a front view of a state in which the current sensor of the embodiment is separated. It is the side view which looked at the current sensor of an embodiment from the left side.

  Hereinafter, a current sensor and a distribution board according to the present embodiment will be described with reference to the drawings. The distribution board according to the present embodiment is a distribution board that is installed in an apartment house, a tenant building, a business office, or the like, and aims to branch a trunk line drawn from an electric power system into a branch circuit. However, the configuration described below is only an example of the present invention. The present invention is not limited to the following embodiments, and various modifications 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.

  The distribution board of the present embodiment is used for single-phase three-wire AC100V / 200V wiring. FIG. 1 is a front view of the distribution board 1, and FIG. 2 is a block diagram showing a circuit configuration of the distribution board 1. The distribution board 1 of the present embodiment includes a current sensor 30 and a cabinet 70 that houses the current sensor 30 and the branch breaker 20 (circuit breaker for distribution board). Moreover, in the distribution board 1 of this embodiment, the main breaker 10 is further accommodated in the cabinet 70. In the present embodiment, description will be made with reference to the vertical, horizontal, and front-rear directions indicated by arrows in FIGS. 1 and 3, which are directions defined for convenience of explanation, and the current sensor 30 and the distribution board. It is not intended to limit the mounting direction of 1 to the above direction.

  The cabinet 70 is formed in a vertically long box shape with an opening 71 provided on the front surface. Two long rail members 73 and 73 are attached to the bottom wall (rear wall) 72 of the cabinet 70. The two rail members 73 and 73 are attached to the left and right sides of the bottom wall 72 so that the longitudinal direction is parallel to the vertical direction. Inside the cabinet 70, a first mounting plate 74 to which the main breaker 10 is mounted and a second mounting plate 75 to which the branch breaker 20 and the current sensor 30 are mounted are mounted via rail members 73 and 73. . In the present embodiment, the branch breaker 20 and the current sensor 30 are mounted on a resin mounting base 76, and the mounting base 76 is fixed to the second mounting plate 75. In the present embodiment, the first attachment plate 74 to which the main breaker 10 is attached is disposed above the second attachment plate 75 to which the branch breaker 20 and the current sensor 30 are attached inside the cabinet 70. A door that closes the opening 71 may be attached to the opening 71 of the cabinet 70.

  Three (R-phase, T-phase, N-phase) trunk lines 81 from the AC power source 200 are connected to the primary side terminal 11 of the main breaker 10. Three transitional conductive bars 83 are connected to the secondary terminal 12 of the main breaker 10.

  A branch breaker 20, a current sensor 30, and three conductive bars 84 are attached to the attachment base 76. The three conductive bars 84 are attached from the upper end to the lower end of the attachment base 76 in the vicinity of the center of the attachment base 76 in the left-right direction. A plurality of (for example, 18 in this embodiment) branch breakers 20 are attached to the mounting base 76 in the vertical direction on the left and right sides of the conductive bar 84. That is, the mounting base 76 is provided with holding portions for individually holding the branch breakers 20 at regular intervals in the vertical direction on the left and right sides of the portion where the conductive bar 84 is disposed. The mounting base 76 is provided with a hooking claw 761 and a hooking spring 762 as holding parts for holding the branch breaker 20 at positions where the branch breaker 20 can be mounted (see FIGS. 3 and 4). The shape of the hooking claw 761 in a side view is formed in an L shape, one end side of the hooking claw 761 is fixed to the mounting base 76, and the other end side of the hooking claw 761 protrudes to the hooking spring 762 side. The hook spring 762 is formed, for example, by bending a metal plate having a spring property. The hook spring 762 has a base portion 763 whose one end is fixed to the mounting base 76, and a V-shaped protrusion portion 764 that protrudes from the other end of the base portion 763 to the hooking claw 761 side. Note that the current sensor 30 of the present embodiment is configured to be attached to the attachment base 76 using a hooking claw 761 and a hooking spring 762 provided for the branch breaker 20.

  The three conductive bars 84 are each formed in a long strip shape from a metal material, and as shown in FIGS. 1 and 3, the mounting base 76 has a longitudinal direction parallel to the vertical direction. Is attached to the center in the left-right direction. The three conductive bars 84 are attached to the attachment base 76 so as to be arranged at equal intervals in the front-rear direction with the thickness direction parallel to the front-rear direction. Each of the three conductive bars 84 is electrically connected to the corresponding transition conductive bar 83, and the transition conductive bar 83 and the conductive bar 84 constitute a conductive member 82 through which a main current flows. In the present embodiment, the three conductive bars 84 are attached to the attachment base 76 so as to be arranged in the order of R phase, N phase, and T phase from the front side.

  The vessel body 21 of the branch breaker 20 is formed in a shape and a size conforming to a contract circuit breaker for a lamp distribution board (see JIS C 8201-2-1). The vessel body 21 of the branch breaker 20 is provided with recesses on both side surfaces in the left-right direction. Further, the container body 21 of the branch breaker 20 is provided with a slit into which each of the three conductive bars 84 is inserted on one side surface in the left-right direction, and two of the three slits are connected to the conductive bar 84. A blade receiving member that is detachably connected is provided.

  The container body 21 of the branch breaker 20 is hooked into the recess on the other side surface with the conductive bar 84 inserted in the slit provided on one side surface and the hooking claw 761 inserted in the recess on one side surface. The protrusion 764 of the spring 762 is inserted to be attached to the attachment base 76. When the branch breaker 20 is attached to the attachment base 76, the blade receiving member of the branch breaker 20 is electrically connected to the conductive bar 84, and the secondary side of the main breaker 10 through the conductive bar 84 and the crossing conductive bar 83. The terminal 12 is electrically connected. In addition, when the front end side of the protruding portion 764 is pushed and bent rearward with a finger, the bent portion of the protruding portion 764 comes out of the concave portion of the container body 21 and the protruding portion 764 is released from the concave portion. It can be removed from the mounting base 76.

  When the branch breaker 20 is for 100V, blade receiving members are arranged in the front or rear slit and the central slit, and the blade receiving members are placed on the R-phase or T-phase conductive bar 84 and the N-phase conductive bar 84. By connecting the members, 100V AC power is supplied to the load. When the branch breaker 20 is for 200V, a blade receiving member is disposed in the front slit and the rear slit, and the blade receiving member is connected to the R-phase conductive bar 84 and the T-phase conductive bar 84. Thus, 200V AC power is supplied to the load.

  In the distribution board 1 of the present embodiment, the 18 branch breakers 20 are divided into three breaker groups G1, G2, G3, each of which has six currents to measure the current supplied to the load for each breaker group. The sensor 30 (31, 32, 33) is attached to the attachment base 76. In the following description, the individual current sensors are described as current sensors 31, 32, and 33, and the description common to the current sensors 31, 32, and 33 is expressed as the current sensor 30.

  The current sensor 30 includes a synthetic resin case 300 (see FIGS. 3, 5, and 6). In the present embodiment, the case 300 includes a first case 40 and a second case 50.

  The first case 40 is formed to have substantially the same external shape and size as the case 21 of the branch breaker 20 that conforms to the agreement circuit breaker for lamp distribution board. As in the case 21 of the branch breaker 20, the first case 40 is provided with a concave portion 41 into which the hooking claw 761 of the mounting base 76 is inserted and a concave portion 42 into which the protruding portion 764 of the hooking spring 762 is inserted. (See FIGS. 3, 5A, 5B, and 7). Here, the concave portion 41 and the concave portion 42 constitute an attachment portion for attaching the current sensor 30 to the distribution board 1 (the attachment base 76 in the present embodiment).

  The second case 50 is formed in a rectangular parallelepiped shape whose vertical dimension is substantially the same as that of the first case 40, and one side surface in the left-right direction is brought into contact with the end surface of the first case 40. 40 is detachably attached. In the second case 50, three insertion grooves 51 into which each of the three conductive bars 84 are inserted are formed on the surface facing the first case 40, and the shape seen from the up and down direction is an E shape. Is formed. Locking pieces 52, 52 projecting from the end on the first case 40 side to the first case 40 side are provided on both side surfaces of the second case 50 in the front-rear direction. In the second case 50, the protrusion 43 provided on the surface of the first case 40 in the hole 53 of each locking piece 52 with one side surface provided with the insertion groove 51 in contact with the end surface of the first case 40. Is inserted into the first case 40.

  Inside the second case 50, a C-shaped second core 62 is accommodated so as to be disposed around the insertion groove 51 on the front side, and C is disposed so as to be disposed around the insertion groove 51 on the rear side. A shaped second core 62 is accommodated. Inside the first case 40, two first cores 61 that are each formed in a C shape and that form a closed magnetic path with each of the two second cores 62 housed in the second case 50 are housed. Yes. In a state where the first case 40 and the second case 50 are coupled, the first core 61 and the second core 62 that form a closed magnetic path surrounding the front insertion groove 51 constitute a core 60A. The first core 61 and the second core 62 that form a closed magnetic path surrounding the rear insertion groove 51 constitute a core 60B. A detection coil 63A is wound around the first core 61 constituting the core 60A, and the core 60A and the detection coil 63A constitute a current transformer CT1 (current measurement unit). A detection coil 63B is wound around the first core 61 constituting the core 60B, and the core 60B and the detection coil 63B constitute a current transformer CT2 (current measurement unit).

  The current sensor 30 is attached to the attachment base 76 as follows. First, the first case 40 is attached to the attachment base 76 by inserting the catch spring 762 into the recess 42 in a state where the catch pawl 761 of the attachment base 76 is inserted into the recess 41. Thereafter, when the conductive case 84 is inserted into each of the three insertion grooves 51 and the second case 50 is brought close to the first case 40, the protrusion 43 of the first case 40 is fitted into the hole 53 of the locking piece 52. Then, the second case 50 is attached to the first case 40. Therefore, the case 300 of the current sensor 30 is attached to the attachment base 76 so that the conductive bar 84 is inserted into the insertion groove 51 of the second case 50 at a desired position of the conductive bar 84.

  In a state where the current sensor 30 is attached to the attachment base 76, the R-phase conductive bar 84 is inserted into the front insertion groove 51, and the T-phase conductive bar 84 is inserted into the rear insertion groove 51. Therefore, a closed magnetic circuit surrounding the R-phase conductive bar 84 (conductive member 82) is formed by the core 60A, and the current flowing through the R-phase conductive bar 84 can be measured by the current transformer CT1. Further, a closed magnetic circuit surrounding the T-phase conductive bar 84 (conductive member 82) is formed by the core 60B, and the current flowing through the T-phase conductive bar 84 can be measured by the current transformer CT1.

  Cables 64A are electrically connected to both ends of the detection coil 63A, and cables 64B are electrically connected to both ends of the detection coil 63B. Each of the two cables 64A and 64B is led out of the first case 40, and a connector 65 is connected to the tip thereof. The cables 64 </ b> A and 64 </ b> B are drawn out of the cabinet 70 through through holes provided in the lower wall of the cabinet 70, and the measurement result of the current sensor 30 is obtained by connecting the connector 65 to the connector of the energy monitor 100. Is output.

  In the distribution board 1 of the present embodiment, 18 branch breakers 20 are connected to the conductive member 82. These 18 branch breakers 20 are divided into a plurality of breaker groups G1, G2, G3 according to the path length of the current path through which current flows from the main breaker 10 to the branch breaker 20 in the conductive member 82. In the current path through which current flows in the conductive member 82, the range in which the branch breaker 20 belonging to one of the plurality of breaker groups G1 to G3 is connected to the conductive member 82 is that the branch breaker 20 belonging to another breaker group is conductive. It does not overlap the range connected to the member 82. The branch breakers 20 belonging to each of the plurality of breaker groups G1 to G3 are collectively connected to the conductive member 82 for each breaker group in the current path. Accordingly, the plurality of breaker groups G1, G2, and G3 are connected to the conductive member 82 so as to be arranged in order in a current path through which a current flows through the conductive member 82.

  In other words, the maximum value of the path length from the main breaker 10 to the branch breaker 20 belonging to the breaker group G1 is shorter than the minimum value of the path length from the main breaker 10 to the branch breaker 20 belonging to the breaker group G2. . Further, the maximum value of the path length from the main breaker 10 to the branch breaker 20 belonging to the breaker group G2 is shorter than the minimum value of the path length from the main breaker 10 to the branch breaker 20 belonging to the breaker group G3. Thereby, each of the breaker groups G1, G2, G3 is gathered together in the current path (the direction in which the current flows in the conductive member 82) through which the branch breakers 20 belonging to each breaker group flow. Will be connected to. In this embodiment, the branch breaker 20 belonging to the breaker groups G1 and G2 is a branch breaker for 100V, and the branch breaker 20 belonging to the breaker group G3 is a branch breaker for 200V. However, one breaker group is for 100V and 200V. The branch breakers 20 may be mixed. In addition, the number of branch breakers 20 constituting one breaker group can be changed as appropriate, and the number of breaker groups can be changed as appropriate.

  The distribution board 1 of the present embodiment includes three current sensors 30 (31, 32, 33) for measuring the current flowing through the conductive member 82 on the upstream side of each of the plurality of breaker groups G1, G2, G3. ). The current sensor 31 measures the current flowing through the conductive member 82 on the upstream side of the breaker group G1, the current sensor 32 measures the current flowing through the conductive member 82 on the upstream side of the breaker group G2, and the current sensor 33 measures the current of the breaker group G3. The current flowing through the conductive member 82 is measured on the upstream side.

  The measured values of the current sensors 31, 32 and 33 are input to the energy monitor 100 which is a power calculation device. The energy monitor 100 obtains electric power supplied to the load for each of the breaker groups G1, G2, and G3 by acquiring current measurement values from the current sensors 31, 32, and 33.

  The current value of the current flowing through the most downstream breaker group G3 among the breaker groups G1, G2, and G3 is equal to the measured value of the current sensor 33 that measures the current flowing through the conductive member 82 on the upstream side of the breaker group G3. Therefore, the energy monitor 100 obtains the electric power supplied from the breaker group G3 to the load by using the measured value of the current sensor 33 and the interphase voltage (R phase-N phase, T phase-N phase interphase voltage). Yes.

  The current value of the current flowing through the breaker group (G1, G2) other than the breaker group G3 is measured on the downstream side of the breaker group from the measured value of the current sensor 30 that measures the current upstream of the breaker group. The current value obtained by subtracting the measured value of the current sensor 30 is obtained. For example, the current value of the current flowing through the breaker group G1 is determined from the measured value of the current sensor 31 that measures current on the upstream side of the breaker group G1, and the measured value of the current sensor 32 that measures current on the downstream side of the breaker group G1. The current value obtained by subtraction. Therefore, the energy monitor 100 subtracts the power obtained by using the measured value of the current sensor 32 and the interphase voltage from the power obtained by using the measured value of the current sensor 31 and the interphase voltage, thereby generating the breaker group G1. Power to be supplied to the load from In addition, the current value of the current flowing through the breaker group G2 is calculated from the measured value of the current sensor 32 that measures current on the upstream side of the breaker group G2, and the measured value of the current sensor 33 that measures current on the downstream side of the breaker group G2. The current value obtained by subtraction. Therefore, the energy monitor 100 subtracts the power obtained using the measured value of the current sensor 33 and the interphase voltage from the power obtained using the measured value of the current sensor 32 and the interphase voltage, thereby generating the breaker group G2. Power to be supplied to the load from

  Further, the energy monitor 100 obtains the total power supplied to the load from all the breaker groups using the measured value of the current sensor 30 that measures the current at the most upstream and the interphase voltage.

  The energy monitor 100 is supplied with electric power from the AC power supply 200, and the energy monitor 100 can obtain the interphase voltage from the R-phase, N-phase, and T-phase voltage values supplied from the AC power supply 200.

  In this embodiment, the energy monitor 100 is installed outside the cabinet 70 of the distribution board 1, but the energy monitor 100 may be housed inside the cabinet 70.

  As described above, the current sensor 30 of the present embodiment includes the case 300 and the current measuring units (current transformers CT1 and CT2). Case 300 has the same mounting part (concave part 41, 42) as the circuit breaker for distribution board (branch breaker 20), and is attached to distribution board 1 using the mounting part. The current measuring unit measures the current flowing through the conductive member 82 (in this embodiment, the conductive bar 84) held in the case 300 and connected to the circuit breaker for distribution board.

  Since the case 300 of the current sensor 30 has the same mounting portion as that of the circuit breaker for distribution board, the case 300 of the current sensor 30 is arranged side by side with the circuit breaker for distribution board using this mounting portion. The current sensor 30 that can be attached to the panel 1 and can be easily attached can be provided. Further, since the case 300 is attached to the distribution board 1 using the same mounting portion as the distribution board circuit breaker, the current sensor 30 is attached using the installation space of the distribution board circuit breaker. Therefore, it is not necessary to provide a separate space for attaching the current sensor 30.

  In the current sensor 30 of the present embodiment, the case 300 includes a first case 40 provided with an attachment portion and attached to the distribution board 1 using the attachment portion, and a second case 50 attached to the first case 40. It is also preferable.

  By attaching the second case 50 to the first case 40 attached to the distribution board 1, the case 300 can be easily attached to the distribution board 1.

  By the way, when the conductive member 82 is passed through the penetrating portion of the case 300, the conductive member 82 must be inserted into the penetrating portion of the case 300 from the end of the conductive member 82, and the mounting work of the current sensor 30 is troublesome. In the current sensor 30 of the present embodiment, the case 300 is divided into a first case 40 and a second case 50, and the first case 40 and the second case 50 are attached to the first case 40 with the second case 50 attached thereto. A conductive member 82 is disposed in a space (insertion groove 51) surrounded by. Therefore, the case 300 can be easily attached to a position in the middle of the conductive member 82, and the attachment work of the current sensor 30 is simplified.

  In the current sensor 30 of the present embodiment, it is also preferable that the current measuring unit includes a first core 61, a second core 62, and detection coils (detection coils 63A and 63B). The first core 61 is accommodated in the first case 40. The second core 62 is housed in the second case 50 and forms a closed magnetic path surrounding the conductive member 82 together with the first core 61. The detection coils (detection coils 63A and 63B) are wound around at least one of the first core 61 and the second core 62.

  Thereby, the first core 61, the second core 62, and the detection coils (detection coils 63A and 63B) constitute a current transformer (current transformers CT1 and CT2), and the current flowing through the conductive member 82 is measured. Can do.

  In the current sensor 30 of the present embodiment, the case 300 is divided into the first case 40 and the second case 50, and the first case 40 and the second case 50 are attached to the first case 40. The conductive member 82 is disposed in a space (insertion groove 51) surrounded by 50. Therefore, by attaching the second case 50 to the first case 40, the first core 61 and the second core 62 can be arranged so as to form a closed magnetic circuit surrounding the conductive member 82, and the assembly of the current sensor 30 is easy. The current sensor 30 can be attached to a desired position of the conductive member 82.

  In the present embodiment, the current measurement unit is configured by the current transformers CT1 and CT2, but the current measurement unit may be configured by a Rogowski coil. In this case, in a state where the first case 40 is coupled to the second case 50, the conductor housed in the first case 40 and the conductor housed in the second case 50 are electrically connected to each other, and What is necessary is just to comprise the logo scoring coil which the member 82 penetrates as a whole.

  The distribution board 1 of the present embodiment includes the current sensor 30 and a cabinet 70 that houses the current sensor 30 and the circuit breaker for the distribution board (branch breaker 20).

  Thereby, the distribution board 1 with which the attachment operation | work of the current sensor 30 is easy can be provided. Moreover, the distribution board 1 which can attach the current sensor 30 using the installation space of the circuit breaker for distribution boards can be provided.

1 Distribution board 20 Branch breaker (Circuit breaker for distribution board)
30, 31, 32, 33 Current sensor 300 Case 40 First case 50 Second case 60A, 60B Core 61 First core 62 Second core 63A, 63B Detection coil 70 Cabinet CT1, CT2 Current transformer

Claims (4)

A case that has the same mounting portion as the circuit breaker for distribution board and is attached to the distribution board using the mounting portion;
A current sensor comprising: a current measuring unit that measures a current flowing in a conductive member that is held by the case and connected to the circuit breaker for distribution board.   2. The case according to claim 1, wherein the case includes a first case provided with the attachment portion and attached to the distribution board using the attachment portion, and a second case attached to the first case. The current sensor described.   The current measuring unit includes a first core housed in the first case, a second core housed in the second case and forming a closed magnetic path surrounding the conductive member together with the first core, and the first core The current sensor according to claim 2, further comprising: a detection coil wound around at least one of the core and the second core.   A distribution board comprising: the current sensor according to claim 1; and a cabinet that houses the current sensor and a circuit breaker for the distribution board.

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