JP5762831B2 - Distribution board with overheat detector - Google Patents

Description

  The present invention relates to a distribution board having a function of detecting overheating of a terminal portion in an on-board device such as a breaker or a limiter.

  Since the equipment in the panel of the distribution board uses a lot of screws in the terminal portion, if the contact state between the power supply seat and the crimp terminal becomes unstable due to the looseness of the screws, arc discharge is likely to occur and it tends to overheat. Therefore, conventionally, a technique has been proposed in which a sensor circuit is connected to a terminal component to detect overheating of the terminal portion.

  For example, in Patent Document 1, both ends of a sensor circuit 101 as shown in FIG. 6 are connected to a terminal screw 102 and a power supply seat 103, and based on the potential difference between these terminal components, the power supply seat 103 and the crimp terminal 104 are connected. A breaker for detecting poor contact is described.

JP 2009-245836 A

  By the way, in the distribution board, in addition to the breaker, devices such as a limiter and a terminal block that use screws in the terminal portion are equipped. When the screws are loosened or the terminal parts are deformed in these in-panel devices, the terminal portion is overheated like the breaker.

  However, when the sensor circuit 101 for each terminal as shown in FIG. 6 is provided on the primary side terminal and the secondary side terminal of a plurality of types of in-panel devices, each device is not only expensive, but a large number of detections are made. There was a problem that the inside of the distribution board was complicated by the wires.

  Accordingly, an object of the present invention is to provide a distribution board capable of detecting overheating of terminals in a plurality of types of in-panel devices with an inexpensive and simple configuration.

In order to solve the above problems, the distribution board of the present invention includes a limiter, a main breaker, and a branch breaker, and connects a power line drawn from the outside to the primary side terminal of the limiter, and connects the secondary side terminal of the limiter. was connected to the primary side terminal of the main breaker, it connects the secondary terminal of the main breaker on the secondary side terminals of the overheat detector connects the primary-side terminals of the overheat detector to the primary side terminal of the limiter, overheat detector , the only set a sensor circuit for detecting a contact failure of the terminals in the limiter and the main breaker, and freely plug-in terminal removably secondary-side terminal of the overheat detector branching copper bars, the overheat detector and branch breakers They are arranged side by side and connected to a branching copper bar .

The distribution board of the present invention is a distribution board having a terminal block, a limiter, a main breaker, and a branch breaker, and connects a power line drawn from the outside to the first input terminal of the terminal block. Connect the first output terminal to the primary side terminal of the limiter, connect the secondary side terminal of the limiter to the second input terminal of the terminal block, connect the second output terminal of the terminal block to the primary side terminal of the main breaker, Connect the secondary side terminal of the main breaker to the secondary side terminal of the overheat detector, connect the primary side terminal of the overheat detector to the first input terminal of the terminal block, and connect the terminal block, limiter, and main unit to the overheat detector. A sensor circuit that detects contact failure of each terminal in the breaker is provided, the secondary side terminal of the overheat detector is a plug-in terminal that can be attached to and detached from the branch copper bar, and the overheat detector is aligned with the branch breaker on the branch copper bar. It is connected .

The overheat detector preferably includes a casing having the same side shape as that of the branch breaker .

  According to the distribution board of the present invention, a plurality of terminals of the breaker, limiter or terminal block are electrically connected to the overheat detector in a predetermined order, and the sensor circuit sensitive to contact failure of each terminal is provided in the overheat detector. Therefore, there is an effect that overheating of terminals in a plurality of types of in-board devices can be detected with an inexpensive and simple configuration.

It is a front view of the distribution board which shows Example 1 of this invention. It is a wiring diagram which shows the procedure which connects the overheat detector of FIG. 1 to a limiter. It is a front view of the distribution board which shows Example 2 of this invention. It is a wiring diagram which shows the procedure which connects the overheat detector of FIG. 3 to a terminal block. It is a block diagram which shows the sensor circuit of the overheat detector of FIG. 1, FIG. It is a circuit diagram which shows the sensor circuit of the conventional breaker.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The distribution board 1 according to the first embodiment shown in FIG. 1 is provided with a limiter 4, a main breaker 5, an overheat detector 7, and a branch breaker 8 inside a case 3. The distribution board 2 of the second embodiment shown in FIG. 3 includes a terminal block 6 inside the case 3 in addition to the in-board equipment of the first embodiment. In the first and second embodiments, the same members are denoted by the same reference numerals in the respective drawings.

  In the distribution board 1 of the first embodiment, as shown in FIG. 1, the three power lines 11 drawn from the outside are connected to the three primary terminals 41 of the limiter 4. The primary side terminal 41 is connected to the secondary side terminal 42 via an internal wiring (not shown) of the limiter 4. The primary and secondary terminals 41 and 42 of the limiter 4 are screw terminals provided with terminal screws 43 and 44, respectively.

  The secondary side terminal 42 of the limiter 4 is connected to the three primary side terminals 51 of the main breaker 5 with three lead wires 12. The primary side terminal 51 is connected to the secondary side terminal 52 via an internal wiring (not shown) of the main breaker 5. The primary and secondary terminals 51 and 52 of the main breaker 5 are screw terminals provided with terminal screws 53 and 54, respectively.

  The secondary terminal 52 of the main breaker 5 is connected to the secondary terminal 72 of the overheat detector 7 via the three-stage relay copper bar 13 and the branching copper bar 14, respectively. The secondary side terminal 72 is connected to the primary side terminal 71 via an internal detection line 74 (see FIG. 5) of the overheat detector 7, and the primary side terminal 71 is a primary side terminal of the limiter 4 by three lead wires 16. 41.

  The relay copper bar 13 is connected to the branching copper bar 14 with screws 15, and the branching copper bar 14 is formed to extend in the longitudinal direction of the distribution board case 3. The overheat detector 7 includes a casing 73 having the same side shape as that of the branch breaker 8, more specifically, a casing 73 having the same depth and height as the branch breaker 8 and a width dimension larger than (for example, twice) the branch breaker 8. And a branching copper bar 14 is mounted at a designated position so as to be aligned with a required number of branch breakers 8.

  As shown in FIG. 2, the primary side terminal 71 and the secondary side terminal 72 of the overheat detector 7 are plug-in terminals that do not require screw tightening, and the secondary side terminal 72 is attached to and detached from the branching copper bar 14. The lead wire 16 is attached to and detached from the primary side terminal 71. When wiring the lead wire 16, the exposed end of the power supply line 11 is inserted into the round terminal 17 fixed to the tip of the lead wire 16, the exposed end and the round terminal 17 are connected by the cylindrical crimping terminal 18, and the crimping terminal 18 is connected to the limiter 4. To the primary side terminal 41.

  As shown in FIG. 5, three detection wires 74 are wired in the casing 73 of the overheat detector 7, and a sensor circuit 75 and a switch 85 are provided for each of them. Based on the potential difference between the primary side terminal 71 and the secondary side terminal 72, the sensor circuit 75 is based on the terminals 41 and 42 of the limiter 4, the terminals 51 and 52 of the main breaker 5, and the screws 15 between the copper bars 13 and 14. Detects poor contact at the connection. Although the sensor circuit 75 is not limited to a specific configuration, for example, an input / output insulation type circuit using a photocoupler 76 (see FIG. 6) can be used.

  The output line 77 (FIG. 5) of the sensor circuit 75 is connected to the average value circuit 79 via the input circuit 78. The average value circuit 79 obtains an average value from the output of the sensor circuit 75, and the determination circuit 80 compares the average value with a threshold value to determine poor contact of the terminals 41, 42, 51, 52, and the like. The determination result is held in the self-holding circuit 81 for a predetermined time, and the output circuit 82 outputs a drive signal to the switch 85 and the alarm circuit 83 during that time. As a result, the switch 85 is opened to cut off the energization current, and the lamp 84 is lit or blinked to notify the contact failure. The lamp 84 may be provided on the casing 73 (see FIG. 1) or may be provided at an arbitrary location on the distribution board case 3.

  Therefore, according to the distribution board 1 of the first embodiment, the primary and secondary terminals 41 and 42 of the limiter 4 and the primary and secondary terminals 51 and 52 of the main breaker 5 are connected to the overheat detector 7 in a predetermined order. Electrical connection is made, and contact failure of the plurality of terminals 41, 42, 51, 52, etc. can be easily detected with one overheat detector 7. In particular, there is an advantage that the casing 73 having the same side shape as that of the branch breaker 8 is used for the overheat detector 7 and the overheat detector 7 and the branch breaker 8 can be arranged on the common branch copper bar 14 in an orderly manner.

  In the distribution board 2 of the second embodiment, as shown in FIG. 3, the three power supply wires 11 drawn from the outside are connected to the three first input terminals 61 of the terminal block 6. The first input terminal 61 is connected to the first output terminal 62 on the same terminal fitting, and the first output terminal 62 is connected to the primary terminal 41 of the limiter 4 through the lead wire 21. The first input terminal 61 and the first output terminal 62 of the terminal block 6 are screw terminals provided with terminal screws 65 and 66, respectively.

  The primary side terminal 41 of the limiter 4 is connected to the secondary side terminal 42 via the internal wiring, and the secondary side terminal 42 is connected to the second input terminal 63 of the terminal block 6 by the lead wire 22. The second input terminal 63 is connected to a second output terminal 64 on the same terminal fitting, and the second output terminal 64 is connected to the primary side terminal 51 of the main breaker 5 by a terminal screw 53. Note that the second input terminal 63 of the terminal block 6 is also a screw terminal provided with a terminal screw 67.

  The primary side terminal 51 of the main breaker 5 is connected to the secondary side terminal 52 via an internal wiring, and the secondary side terminal 52 is connected to the secondary of the overheat detector 7 via the relay copper bar 13 and the branching copper bar 14. It is connected to the side terminal 72. The overheat detector 7 is configured in the same manner as in the first embodiment (see FIG. 5), and the secondary terminal 72 is connected to the primary terminal 71 via the detection line 74. The primary terminal 71 of the overheat detector 7 is connected to the first input terminal 61 of the terminal block 6 by the lead wire 23.

  As shown in FIG. 4, when wiring the lead wire 23, the exposed end of the power supply wire 11 is inserted into the round terminal 17 at the tip, the round terminal 17 and the crimp terminal 19 are fixed to the exposed end, and the lead wire 23 is connected to the power supply wire. 11, the crimp terminal 19 is connected to the first input terminal 61 of the terminal block 6.

  According to the distribution board 2 of the second embodiment, the input / output terminals 61, 62, 63 and 64 of the terminal block 6 and the primary and secondary terminals 41 and 42 of the limiter 4 and the primary and secondary terminals of the main breaker 5 are provided. 51 and 52 are electrically connected to the overheat detector 7 in a predetermined order, and a single overheat detector 7 can easily detect poor contact of a large number of terminals 41, 42, 51, 52, 61, 62, 63 and 64. can do.

  The present invention is not limited to the distribution boards 1 and 2 of the above embodiment, but various distribution boards equipped with a breaker for a primary feed circuit, a breaker for an electric light contractor according to time of day, etc. as an in-panel device. The present invention can also be applied, and other configurations and wiring sequences can be appropriately changed without departing from the spirit of the invention.

1 Distribution board (Example 1)
2 Distribution board (Example 2)
3 Case 4 Limiter 5 Main breaker 6 Terminal block 7 Overheat detector 8 Branch breaker 11 Power line 14 Branching copper bar 41 Primary terminal of limiter 42 Secondary terminal of limiter 51 Primary terminal of main breaker 52 Second of main breaker Secondary terminal 61 First input terminal of terminal block 62 First output terminal of terminal block 63 Second input terminal of terminal block 64 Second output terminal of terminal block 71 Primary side terminal of overheat detector 72 Secondary of overheat detector Side terminal 73 Overheat detector casing 75 Sensor circuit

Claims (3)

In distribution board having a the limiter and main breaker and the branch breaker, connect the power line has been drawn from the outside to the primary side terminal of the limiter, connect the secondary-side terminal of the limiter to a primary side terminal of the main breaker and connects the secondary terminal of the master breaker to the secondary side terminals of the overheat detector connects the primary-side terminals of the overheat detector to the primary side terminal of said limiter,
The overheat detector, set a sensor circuit for detecting a contact failure of the respective terminals in the main breaker and the limiter,
A distribution board characterized in that a secondary terminal of the overheat detector is a plug-in terminal that is detachably attached to a branching copper bar, and the overheat detector is aligned with the branch breaker and connected to the branching copper bar . In distribution board having a branch breaker terminal block and the limiter and the main breaker, connect the power line has been drawn from the outside to the first input terminal of the terminal block, the first output terminal of the terminal block of the limiter was connected to the primary terminal to connect the secondary-side terminal of the limiter to a second input terminal of the terminal block connects the second output terminal of the terminal block to the primary side terminal of the main breaker, the main breaker and connecting the secondary terminal to the secondary terminal of the overheat detector connects the primary-side terminals of the overheat detector to a first input terminal of the terminal block,
Wherein the overheat detector, a sensor circuit for detecting a contact failure of the respective terminals in the main breaker said terminal board and said limiter,
A distribution board characterized in that a secondary terminal of the overheat detector is a plug-in terminal that is detachably attached to a branching copper bar, and the overheat detector is aligned with the branch breaker and connected to the branching copper bar . The overheat detector distribution board according to claim 1 or 2, wherein with the casing of the same side profile as the branch breakers.

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