JP2008289301A - Distribution board with monitoring function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a distribution board with a monitoring function that outputs a current alarm by monitoring a current not only in a main circuit but also in each branch circuit even when it is impossible to secure a wide in-board space. <P>SOLUTION: The distribution board with a monitoring function is composed of a main breaker 11, each branch breaker 13, and a monitoring device 16 provided with a current alarm output function for the main breaker. Each branch breaker 13 is a wiring circuit-breaker with a current alarm that has a built-in current alarm output function. Current alarm output of each branch breaker is input to the monitoring device 16 so as to allow a main circuit and each branch circuit to be monitored, respectively. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a distribution board with a monitoring function capable of monitoring that a current flowing through a main circuit or a branch circuit approaches a rating and outputting a current alarm prior to circuit interruption.

  The distribution board has a number of branch breakers connected to the secondary side of the main breaker, and the secondary side of each branch breaker is connected to a load circuit. In residential distribution boards, etc., the rated current of the main circuit is set by contract with the power company. When the current of the entire panel exceeds the contracted current, the main circuit breaker is activated and the main circuit is shut off. Yes.

  However, when a device that is severely damaged due to a sudden circuit interruption, such as a small-capacity server, is connected to the load, an alarm is issued in advance when the load current increases, and the device continues to be used. Then, it is convenient if there is a function (current alarm function) that warns in advance that the circuit may be interrupted.

  Therefore, as described in Patent Document 1, a distribution board provided with a current alarm device (monitoring device) that warns that the current detected by the CT is close to the rated value while the main breaker incorporates a CT. Is provided. However, since the distribution board of Patent Document 1 detects the current flowing through the main breaker, only the overcurrent of the entire board can be monitored, and a current alarm is output for the branch circuit connected to each branch breaker. I couldn't.

It should be noted that it is not impossible to attach a CT externally to each branch circuit, individually take out and monitor the CT output, and provide a current alarm function. In that case, however, as shown in FIG. 1, the secondary wirings 2 of a large number of branch breakers 1 must pass through the CT 3 and the output of each CT 3 must be drawn to the terminal device 4. It takes a lot of space. For this reason, it is difficult to attach an external CT and perform CT output wiring in the same way as the main circuit in a distribution board that does not have enough room in the panel, and a current alarm is also output to each branch circuit. There has been very little actually done.
JP 2001-218313 A

  The object of the present invention is to solve the above-mentioned conventional problems, and even when a large board space cannot be obtained, a monitoring function capable of monitoring current and outputting a current alarm not only for the main circuit but also for the branch circuit It is to provide an attached distribution board.

  The distribution board with a monitoring function of the present invention made to solve the above problems comprises a main breaker, a branch breaker, and a monitoring device having a current alarm output function of the main breaker. It is a circuit breaker with a current alarm with a built-in alarm output function. By inputting the current alarm output of each branch breaker to the monitoring device, the current alarm of the main breaker and branch breaker can be monitored respectively. It is a feature.

  As described in claim 2, the circuit breaker with a current alarm is provided with a current alarm output connector part, and the current alarm output of each branch breaker is collectively monitored by a transition connector set in which each connector part is sequentially connected. It is preferably configured to input to the device.

  In the distribution board with a monitoring function of the present invention, each branch breaker is a circuit breaker with a current alarm having a built-in current alarm output function, and the current alarm output of each branch breaker is input to the monitoring device of the main breaker. Therefore, even when there is not enough space inside the distribution board, the current can be monitored and the current alarm can be output not only for the main circuit but also for the branch circuit. For this reason, it is possible to review the usage status of power before circuit interruption for each circuit and to avoid troubles that result in circuit interruption.

  In addition, if the current alarm output of each branch breaker is collectively input to the monitoring device by the crossover connector set as in claim 2, the wiring can be simplified even when the number of branch breakers is large. This makes it possible to efficiently perform the wiring work inside the distribution board having no space.

Preferred embodiments of the present invention are shown below.
FIG. 2 is a front view of the distribution board according to the present invention, 10 is a housing of the distribution board, 11 is a main breaker, 12 is a bus bar connected to the secondary side, and 13 is an input terminal to the bus bar 12. There are a number of branch breakers plugged in. As shown in FIG. 3, a CT 15 is attached to the input line 14 to the main breaker 11, and a current flowing through the main breaker 11, that is, a main circuit current is detected.

  Reference numeral 16 denotes a monitoring device for a main breaker, which is provided with a plurality of alarm input terminals, and monitors the main circuit current by connecting the output line 17 of the CT 15, for example, a current exceeding 90% of the rating is detected. If this happens, a current alarm is output.

  Although monitoring the current of the main circuit and outputting a current alarm as described above is the same as the invention described in Patent Document 1, in the present invention, each branch breaker 13 has a current alarm output function built-in. A circuit breaker for wiring is used.

  For example, as shown in FIG. 4, a current alarm CT 20 is accommodated in a case 21, and an electric wire 24 connecting the power-side terminal 22 and the fixed contact 23 penetrates the CT 20. Yes. Note that this circuit breaker for wiring is a two-pole type. However, unlike ZCT for detecting leakage, only one pole of the electric wire 24 may be passed, and the other pole of the electric wire is allowed to pass outside of the CT 20. It is.

  In addition, a relay board 25, a relay 26, a measurement main board 27, and the like that constitute a current alarm output unit are disposed inside the case 21. The measurement main board 27 is a board on which an electronic element for measuring the current detected by the CT 20 is mounted, and the relay board 25 is a board for controlling whether or not to output a current alarm.

  In the case of a branch breaker, an alarm is set to be issued when a current exceeding 80% of the rated value is detected, and the relay board 25 operates the relay 26 when such a current flows in the branch circuit. The LED 28 for current alarm display is turned on and a current alarm signal is output.

  As shown in FIGS. 4 and 5, the connector 30 of the current alarm output unit is provided on the same side as the load side terminal 29 of the case 21, and the connector 30 of each branch breaker 13 is shown in FIGS. In this way, the connecting connector set 31 sequentially connects in series, and the current alarm output of each branch breaker 13 is input to the monitoring device 16 at once. The monitoring device 16 can monitor current alarms of the main breaker 11 and the branch breaker 13 respectively.

  If such crossover wiring is performed, wiring work is facilitated even when there is not enough space. When a current alarm is output from any branch breaker 13, an alarm can be output from the alarm device 16. As for the branch circuit, it is not possible to directly determine which branch circuit is dangerous depending on this alarm. However, if an alarm is issued, the branch breaker 13 that outputs a current alarm can be opened by opening the distribution board. Since the LED 28 for displaying the current alarm is lit, it can be easily determined. In particular, if the door surface of the distribution board is made of a transparent resin panel, visual confirmation of the power supply state is possible even with the door closed.

  Note that all branch breakers 13 are not divided into blocks but divided into several blocks, crossover wiring is performed within each block, and alarms of the alarm device 36 are distinguished from the main, block 1, block 2, block 3, etc. It can also be made possible.

  In this embodiment, the branch current alarm is set to 80% of the rated current and the main current alarm is set to 90% of the rated current. However, this set value can be changed as appropriate. is there.

  As described above, the distribution board with a monitoring function of the present invention can monitor the current not only for the main circuit but also for the branch circuit and output a current alarm even when a large space in the panel cannot be obtained. .

It is a front view of the distribution board which shows a prior art. It is a front view which shows the electricity distribution panel of this invention. It is an expansion perspective view of the principal part. It is a perspective view which shows the internal structure of a branch breaker. It is a perspective view which shows a crossover wiring.

Explanation of symbols

1 Branch breaker in conventional example 2 Secondary wiring 3 CT
4 Terminal device 5 Distribution board 10 Housing of distribution board of the present invention 11 Main breaker 12 Bus bar 13 Branch breaker 14 Input line 15 CT
16 Monitoring device 17 CT output line 20 CT for current alarm
21 Case 22 Power supply side terminal 23 Fixed contact 24 Electric wire 25 Substrate for relay 26 Relay 27 Main board for measurement 28 LED
29 Load side terminal 30 Connector 31 Transition connector set

Claims (2)

  It consists of a main breaker, a branch breaker, and a monitoring device with a current alarm output function for the main breaker. Each branch breaker is a circuit breaker with a current alarm that has a built-in current alarm output function. A distribution board with a monitoring function, wherein an alarm output is input to the monitoring device so that current alarms of a main breaker and a branch breaker can be monitored.   The circuit breaker with a current alarm is equipped with a connector for current alarm output, and the current alarm output of each branch breaker is input to the monitoring device in a lump by a transition connector set that connects each connector sequentially. The distribution board with a monitoring function according to claim 1.

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