JP2016220265A - Power distribution board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power distribution board that is capable of securely making a breaker trip even when abnormal current other than overcurrent has flown in a branch circuit, and suppresses increase in the size of the board.SOLUTION: A power distribution board comprises: a plurality of breakers 4 including an external signal tripping mechanism; a measurement device 5 for measuring current information on each breaker 4; and a determination unit 6 for monitoring the measured current information. The determination unit 6 comprises: determination means for performing abnormality determination on the basis of current information input from the measurement device 5; individual identification means for identifying a breaker 4 that has been determined to be abnormal; and output means for transmitting a control signal to an external signal tripping mechanism of the identified breaker 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a distribution board in which a plurality of breakers having an external signal tripping mechanism are housed.

  The branch breaker housed in a general distribution board has overcurrent detection means inside, and when overcurrent is detected, it trips the contact point by a trip mechanism and shuts down the circuit. I have.

  Thus, the normal branch breaker trips only with the current value detected inside the breaker, and cannot be tripped depending on current information such as tracking that cannot be detected inside the breaker. On the other hand, there has been a voltage trip breaker that can shut off the breaker by an artificial operation from the outside. However, this does not have a function of shutting down the circuit by measurement information. Therefore, a dedicated detection device as shown in Patent Document 1 is provided to detect the tracking current, and when the tracking current flows, the ZCT is operated to trip the breaker.

  However, if a tracking current detection device is incorporated in each breaker, there is a problem that the breaker becomes larger and the cost is increased.

  Furthermore, recently, HEMS (Home Energy Management System) is becoming widespread, and the necessity of blocking the breaker by various external information and measurement information is increasing.

JP-A-10-75510

  Accordingly, an object of the present invention is to solve the above-described conventional problems and to provide a distribution board capable of reliably tripping the breaker based on current information measured outside the breaker.

  The distribution board of the present invention made to solve the above problems includes a plurality of breakers having an external signal tripping mechanism, a measuring device for measuring current information of each breaker, and monitoring the measured current information. A determination unit for determining abnormality based on the input current information, an individual specifying unit for specifying the breaker determined to be abnormal, and an external signal tripping mechanism for the specified breaker And an output means for sending a control signal.

  According to another aspect of the present invention, the determination unit includes a setting unit that sets a rated current of the breaker, and the determination unit compares the measured current information with the set rated current to perform an abnormality determination. Can be.

  According to a third aspect of the present invention, the determination unit includes a setting unit that sets a basic waveform of current, and the determination unit determines that an abnormality occurs when an element of the measured current waveform exceeds a set value. can do.

  According to a fourth aspect of the present invention, the determination unit includes external input means for inputting measurement information other than current information measured in the distribution board, and performs abnormality determination based on the measurement information. it can.

  Further, according to a fifth aspect of the present invention, the determination unit includes a communication unit, and makes an abnormality determination based on external information obtained from the communication unit.

  The distribution board of the present invention measures the current information of each breaker equipped with an external signal trip mechanism by the measuring device, and the determination unit specifies the presence / absence of the abnormality and the breaker determined to be abnormal based on the current information. The breaker can be tripped by sending a control signal to the external signal tripping mechanism of the broken breaker. If not only an overcurrent but also various abnormal current waveforms are set in this determination unit, the breaker can be reliably tripped even when an abnormal current other than an overcurrent flows in the branch circuit.

  It is also possible to omit the overcurrent detection device of each breaker and to make the determination unit perform overcurrent detection. In that case, the structure of each breaker can be simplified and the size can be further reduced.

  According to the invention of claim 2 and below, abnormality determination is performed based on current information, current waveform, measurement information other than current value, external information obtained from communication means, etc., and a specific breaker or all breakers are Can be tripped. Since this communication device can be used as a communication device with the HEMS, various utilization methods can be adopted. For example, when an earthquake occurs, a branch circuit can be cut off to prevent a fire.

It is a schematic diagram which shows the internal composition of the electricity distribution panel of embodiment. It is an internal block diagram of a determination unit.

Embodiments of the present invention will be described below.
FIG. 1 is a schematic diagram showing an internal composition of a distribution board according to the embodiment, in which 1 is a casing of the distribution board, 2 is a main breaker connected to a commercial power source, and 3 is connected to a secondary side of the main breaker 2 The bus bars 4 and 4 are a plurality of branch breakers connected to the bus bar 3. The breaker 4 is, for example, a plug-in breaker, and its power supply side terminal is plug-in connected to the bus bar 3. Each load is connected to the load side terminal. However, the breaker 4 is not limited to a plug-in breaker, and may be of a type connected to the bus bar 3 using a branch bar.

  Although the above configuration is the same as that of the prior art, a breaker having an external signal trip mechanism is used as the breaker 4 in the present invention. This is a breaker capable of causing the operation of the shut-off mechanism by a signal input from the outside. For this reason, in this embodiment, the breaker which omitted the overcurrent detection device incorporated in the normal breaker is used, and the size reduction is enabled. However, it is of course possible to use a breaker in which an overcurrent detection device is incorporated.

  Each breaker 4 is provided with a measuring device 5 that measures current information flowing through each breaker 4. A typical current information is a current value, and a CT can be used as the measuring device 5. However, as long as the current information flowing through the breaker 4 can be measured, it is not limited to CT, and a Rogowski coil or other various current measuring devices can be used. In the embodiment of FIG. 1, the measuring device 5 is arranged on the load side of the breaker 4, but it can also be arranged on the power source side.

  Reference numeral 6 denotes a determination unit that monitors current information measured by the measuring device 5, and FIG. The current information detected by each measuring device 5 is input from the input port 7 to the determination unit 6. Reference numeral 8 denotes setting means, and 9 denotes determination means. The setting means 8 is input with the type, rated current, etc. of each breaker 4 together with the breaker individual number. Therefore, the setting means 8 also functions as an individual specifying means for the breaker 4. The determination means 9 performs various abnormality determinations described below, and outputs a control signal to each breaker 4 from the output port 10 that is an output means when it is determined as abnormal. Reference numeral 11 denotes a communication means for transmitting data to an external monitoring device such as the HEMS 12, receiving a control command, and the like. Although the input port 7 and the output port 10 are physically matched, the breaker 4 can be specified using the individual number set in the setting means 8.

  Further, the determination unit 6 can be provided with an external input means for inputting measurement information other than the current information measured in the distribution board, and the abnormality determination can be performed based on the measurement information. Examples of the external signal include a signal notifying that the lightning arrester provided in the casing 1 of the distribution board has been operated, a seismic intensity signal input from the seismic relay, and a signal from the HEMS 12.

Next, various operations of the determination unit 6 will be described.
First, when the current value of the specific breaker 4 measured by the measuring device 5 exceeds the rated current of the breaker 4 set in the setting means 8, the determination means 9 of the determination unit 6 determines the current value based on the operating characteristic curve. It is determined whether the current information is abnormal or temporary. If it is determined that there is an abnormality, the circuit breaker 4 that has been determined to be abnormal is identified, and a control signal is output from the output port 10 that is an output means to the external signal tripping mechanism of the identified circuit breaker 4. This control signal is usually a pulse signal. Upon receiving the external signal, the breaker 4 operates the breaking mechanism to open the contact point, and cuts off the power supply to the load connected to the breaker 4. If the overcurrent is determined by the determination unit 6 in this way, the breaker 4 does not require an overcurrent detection device, and therefore the breaker 4 can be downsized.

  At the same time, the communication means 11 outputs a signal notifying the occurrence of abnormality to an external monitoring device such as the HEMS 12. The HEMS 12 acquires current information of each branch circuit, functions as a current information monitor, and can also display a power monitor. It also has functions for peak cut and peak shift of power usage.

  A basic waveform of current can also be set in the setting means 8 of the determination unit 6. Although the current waveform of the commercial power supply draws a sine curve, harmonics are superimposed when a tracking phenomenon occurs in the circuit. The determination means 9 determines that an abnormality occurs when the measured current waveform element exceeds the set value. Then, the breaker 4 in which the waveform abnormality is detected is specified, and a control signal is output to the breaker 4 from the output port 10 which is an output means. Upon receiving the external signal, the breaker 4 operates the shut-off mechanism to cut off the power supply to the load connected to the breaker 4. At the same time, the communication means 11 outputs a signal notifying the occurrence of abnormality to an external monitoring device such as the HEMS 12.

  When the distribution board is equipped with a lightning arrester or a seismic relay, external detection information from these devices is input to the external input means of the determination unit 6, and the determination unit 6 is set in the setting means 8. Compared with the set threshold value, it is determined whether or not the breaker 4 should be shut off. For example, when earthquake information of seismic intensity 6 or higher is input, a control signal is immediately sent to all breakers 4 to shut off the circuit, and when the seismic intensity is 5, other than the breaker 4 to which an emergency light or the like is connected A circuit can be shut off by sending a control signal to the breaker 4. The load circuit that is immediately cut off in this way and the load circuit that is cut off after a predetermined time (for example, 3 minutes) are set in the setting means 8 in advance.

  In addition, the determination unit 6 can also block the specific breaker 4 when an emergency earthquake warning is received through the communication means 11. Further, even when the HEMS 12 instructs the cutting of the power usage amount, the determination unit 6 can cut off the breaker 4 in the preset order to reduce the power usage amount.

  In the above embodiment, the branch breaker 4 is a breaker having an external signal tripping mechanism, but the main breaker 2 can also be a breaker having an external signal tripping mechanism. In this case, the main breaker 2 is also provided with a measuring device for measuring current information, and when a current exceeding the threshold is detected, a control signal is sent from the determination unit 6 to the main breaker 2 to cut off all circuits. it can.

  As described above, the distribution board of the present invention can reliably trip the breaker 3 even when an abnormal current other than an overcurrent flows through the branch circuit. In addition, a dedicated detection device for tracking detection is unnecessary. Furthermore, if the breaker 4 in which the overcurrent detection device is omitted as in the embodiment is used, the breaker can be reduced in size and has many advantages.

DESCRIPTION OF SYMBOLS 1 Case 2 Main breaker 3 Bus bar 4 Breaker 5 Measuring device 6 Judgment unit 7 Input port 8 Setting means 9 Judgment means 10 Output port 11 Communication means 12 HEMS

Claims (5)

A plurality of breakers provided with an external signal trip mechanism, a measuring device that measures current information of each breaker, and a determination unit that monitors the measured current information,
The determination unit includes determination means for determining abnormality based on the input current information;
An individual identification means for identifying an abnormally determined breaker;
A distribution board comprising output means for sending a control signal to an external signal tripping mechanism of the specified breaker.   The determination unit includes a setting unit that sets a rated current of a breaker, and the determination unit compares the measured current information with a set rated current to perform an abnormality determination. The distribution board described.   2. The determination unit according to claim 1, further comprising a setting unit configured to set a basic waveform of current, wherein the determination unit determines that an abnormality occurs when an element of the measured current waveform exceeds a set value. Distribution board.   2. The distribution board according to claim 1, wherein the determination unit includes external input means for inputting measurement information other than current information measured in the distribution board, and performs abnormality determination based on the measurement information. .   The distribution board according to claim 1, wherein the determination unit includes a communication unit, and performs abnormality determination based on external information obtained from the communication unit.

Images