JP2013252021A - Power distribution board capable of detecting abnormality of cable way - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power distribution board which detects abnormality such as connection failure and conduction failure at one position of cable ways and informs a user of the abnormality.SOLUTION: A trunk breaker 4, a branch breaker 5, a terminal board 6 are provided in a housing of a power distribution board 1. Multiple power supply side terminal parts 6a and multiple load side terminal parts 6b are respectively aligned in the housing 11 of the terminal board 6. In the housing 11, there are provided: multiple sensor circuits 12 detecting an electric potential difference of the two load side terminal parts 6b having the same polarity; a detection circuit 13 detecting abnormality of cable ways (L1, N, L2) on the basis of output of each sensor circuit 12; and a buzzer 15 and a lamp 17 which raise alarms in response to a command from the detection circuit 13.

Description

  The present invention relates to a distribution board having a function of detecting an abnormality such as a connection failure or a conduction failure.

  Generally, the distribution board is equipped with a plurality of branch breakers on the electric circuit between the main breaker and the terminal block. Since these on-board devices use screws in the terminal portion, loose connection of the screws can cause poor connection and easily generate heat. Therefore, conventionally, a technique has been proposed in which a circuit for detecting a connection failure in the terminal portion is provided in the breaker. For example, the breaker described in Patent Document 1 is configured to connect a sensor circuit to a screw of a terminal portion and a power supply seat and detect a connection failure of the terminal portion based on the output of the sensor circuit.

JP 2009-245836 A

  By the way, there are a plurality of breaker terminal sections on the power supply side and load side, and the distribution board is provided with a number of terminal sections using screws such as terminal blocks and copper bars in addition to the breaker. In addition to the terminal portions, there are scattered electrical connection portions such as internal contacts and lead wires of the breaker that may have poor conduction. For this reason, according to the prior art, in order to detect a connection failure or a conduction failure, it is necessary to provide sensor circuits in a large number of electrical connection portions, and there is a problem that the configuration of the distribution board becomes complicated.

  Accordingly, an object of the present invention is to provide a distribution board capable of detecting an abnormality such as a connection failure or a conduction failure at one place in the panel and notifying the user.

In order to solve the above-described problems, the present invention provides the following means in a distribution board equipped with a plurality of branch breakers on an electric circuit between a main breaker and a terminal block.
(1) A terminal block housing includes a plurality of terminal portions connected to an electric circuit, a sensor circuit for detecting a potential difference between two terminal portions having the same polarity among the terminal portions, and an electric circuit based on an output of the sensor circuit. A distribution board comprising a detection circuit for detecting an abnormality.

(2) A distribution board characterized in that an alarm device for generating an alarm in response to a command from the detection circuit is provided in the housing of the terminal block.

  According to the distribution board of the present invention, since the sensor circuit is provided in the terminal block which is the terminal device, there are a number of defective and non-conductive electrical connections in the electric circuit including the terminal block 6 up to the main circuit breaker. Can be detected all at once and notified to the user with an alarm if necessary.

It is an equipment layout diagram of a distribution board showing one embodiment of the present invention. It is the front and bottom view which show the terminal block of the distribution board of FIG. FIG. 3 is a wiring diagram of a distribution board including the terminal block of FIG. 2.

  Hereinafter, an embodiment in which the present invention is embodied in a distribution board of a single-phase three-wire circuit will be described with reference to the drawings. A distribution board 1 shown in FIG. 1 includes a support frame 3 inside a housing 2, and a main breaker 4, a branch breaker 5, and a terminal block 6 are mounted on the support frame 3. A power supply line 7 is connected to the power supply side terminal portion 4a of the main breaker 4, and a copper bar 8 is connected between the load side terminal portion 4b of the main breaker 4 and the power supply side terminal portion 5a of the branch breaker 5, and the branch breaker. The lead wire 9 is wired between the load side terminal portion 5 b of the power source terminal 5 b and the power source side terminal portion 6 a of the terminal block 6, and the load wiring 10 is connected to the load side terminal portion 6 b of the terminal block 6.

  As shown in FIGS. 2A and 2B, the terminal block 6 includes a long housing 11, and a plurality of power-side terminal portions 6 a and load-side terminal portions 6 b are arranged on the surface of the housing 11. . Inside the housing 11, a circuit board 14 having a sensor circuit 12, a detection circuit 13, a communication circuit 18, an external connection terminal 19 (see FIG. 3 respectively), and an alarm buzzer 15 are provided. The alarm buzzer 15 is built in one end of the housing 11, and a reset button 16 and an alarm lamp 17 for stopping the sounding of the alarm buzzer 15 are disposed on the surface of one end of the housing 11.

  As shown in FIG. 3, the two adjacent terminal portions 6 a and 6 b of the terminal block 6 are connected to electric circuits (L 1 and N or N and L 2) having different polarities by lead wires 9. Each of the plurality of sensor circuits 12 is connected to every other two load side terminal portions 6b and detects the potential difference between the two terminal portions 6b having the same polarity (L1 and L1, N and N, L2 and L2). . The detection circuit 13 detects an abnormality in the electric circuit based on the output of each sensor circuit 12, outputs an alarm command to the buzzer 15 and the lamp 17, and outputs an alarm notification command for the outside of the panel to the communication circuit 18. It is configured as follows.

  In the distribution board 1 having the above-described configuration, somewhere in three electric circuits (voltage lines L1, L2, neutral line N) including the copper bar 8, the branch breaker 5, and the terminal block 6 on the downstream side of the main breaker 4. If a connection failure occurs in the terminal portion or screw connection portion, or a continuity failure or disconnection occurs in the internal contact 5c or the lead wire 9 of the branch breaker 5, the sensor circuit 12 of the same polarity connected to the electric circuit is connected. The abnormal potential difference between the two terminal portions 6b is detected, the detection circuit 13 outputs an alarm command, the buzzer 15 sounds, the lamp 17 is lit, and the user is notified of the electric circuit abnormality. Therefore, the single terminal block 6 which is the terminal device of the distribution board 1 can accurately detect an electric circuit abnormality including the terminal block 6 and reaching the main breaker 4 with a simple configuration.

  In addition, this invention is not limited to the said embodiment, The breaker for primary sending circuits, the breaker for electric light contract apparatus classified by time zone, etc. are added as the in-panel apparatus of the distribution board 1, or the detection circuit 13 is provided. It is also possible to appropriately change the configuration of each part of the distribution board without departing from the spirit of the invention, such as shutting off the main breaker 4 when an abnormality in the electric circuit is detected.

1 Distribution board 4 Main breaker 5 Branch breaker 6 Terminal block 6a, 6b Terminal block 8 Copper bar 11 Housing 12 Sensor circuit 13 Detection circuit 15 Alarm buzzer 16 Reset button 17 Alarm lamp

Claims (2)

  In a distribution board equipped with a plurality of branch breakers on the electrical circuit between the main circuit breaker and the terminal block, a plurality of terminal parts connected to the electrical circuit on the housing of the terminal block, and the same polarity of the terminal parts A distribution board comprising: a sensor circuit that detects a potential difference between the two terminal portions; and a detection circuit that detects an abnormality in an electric circuit based on an output of the sensor circuit.   2. The distribution board according to claim 1, wherein an alarm device for generating an alarm in response to a command from the detection circuit is provided in the housing of the terminal block.

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