JP2013101136A - Overcurrent detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an overcurrent detection device whose installation space when it is installed in a distribution panel is saved irrespective of power capacity of load equipment to be a control object, by which change of existing electric wiring is not required, change of the electric wiring is minimized also in reform of a house in the future, and convenience of control is high.SOLUTION: An overcurrent detection device is constituted by including: a determination part which determines whether or not current at a predetermined level flows to a cable way based on a signal from a current sensor; an HA terminal part 107 which outputs a signal for performing operation control of load equipment by an HA control signal according to a determination result from the determination part; and a connection part with a display and notification part of the determination result by the determination part, the connection part uses four-core communication lines, on the other hand, among the four-core communication lines, uses one as a common ground line, one as a voltage pole of a speaker, and performs lighting/extinction control of three LEDs by the remaining two.

Description

The present invention relates to an overcurrent detection device that is used by being incorporated in a distribution board, and in particular, provides an alarm according to the magnitude of a current flowing in an electric circuit, and a load device to be controlled by an HA control signal. The present invention relates to an overcurrent detection device that controls power on / off.

Conventionally, there has been an overcurrent detection device incorporated in a distribution board as shown in Non-Patent Document 1.

This is because a current sensor provided in the circuit in the distribution board is always used to detect the magnitude of the current flowing in the circuit, and a predetermined current value is set as a threshold current to a ratio exceeding the threshold current. Correspondingly, by voice, it is notified to the surroundings of the distribution board that overuse of electricity and power supply to the load circuit to be controlled are cut off, and the built-in relay is turned off. Thus, power supply to the load circuit to be controlled is cut off. Further, when the magnitude of the current flowing through the electric circuit becomes a predetermined current value (referred to as a return current) or less, the power supply to the load circuit is resumed by turning on the relay.

For installation, replace with a part of the branch switch installed in the distribution board, remove two continuous circuits from multiple branch switches, and install them in a vacant space. Similar to the branch switch of the distribution board, the power supply of the overcurrent detection device is supplied by being connected to the branch line.

Regarding the electrical wiring, in the distribution board, wiring is performed so that a relay provided in the overcurrent detection device is interposed for one of the wiring of the load circuit to be controlled connected to the branch switch. . That is, by disconnecting one pole of the load-side wiring of the branch switch and connecting the cut end to the overcurrent alarm, the connection to a relay provided in the overcurrent alarm is established. The power supply to the load circuit is controlled by connecting and opening / closing the relay.

The current sensor is provided in the main switch provided in the distribution board. The current sensor is provided in the inner conductor of the main switch so as to penetrate both poles of a single-phase three-wire circuit connected to the main switch, and uses a current transformer (hereinafter referred to as CT). ing.

Further, the overcurrent detection device is provided with two relays so that two load circuits can be controlled.

TENPAR INDUSTRY CO., LTD. 2005 General Catalog Page 349 to 350

However, when the overcurrent detection device is provided in the distribution board, since the relay is provided in the overcurrent detection device, there is a problem that the body of the overcurrent detection device itself becomes large. It was. That is, since a load circuit is assumed as a control target, the load connected to the load circuit is not specified, and a load of about 15 A, which is a general rating of electrical wiring, can be controlled to be cut off / on. Since it is necessary to use a relay and the size of two branch switches is required, the number of branch switches in the distribution board is reduced. In particular, when there are a plurality of load circuits to be controlled, it is necessary to provide the same number of relays. In addition, since two input / output terminals to the relay are required per load circuit, four load terminals are provided for two load circuits and six input / output terminals are provided for three load circuits. There is a problem that the required installation space is increased.

In the case of a branch switch as shown in Non-Patent Document 1, since the overcurrent detection device controls two load circuits, the size of the branch switch is two. Recently, the width of the branch switch in the parallel direction, which was developed for the purpose of downsizing the distribution board, which is frequently used in the distribution board, is an abbreviation of the branch switch shown in Non-Patent Document 1. In a distribution board using a thin branch switch that is half the size, there is a problem that the size becomes 4 circuits, and the number of load circuits to be reduced becomes very large.

In addition, there is a problem that the wiring of the load circuit becomes complicated in the distribution board. That is, one of the wirings of the load circuit to be controlled connected to the branch switch needs to be wired so as to interpose a relay provided in the overcurrent detection device. It takes time and effort to cut one end of the load side wiring and connect the cut end to the overcurrent alarm. In addition, when the load circuit to be controlled is changed due to the home renovation and the change in the floor plan of the house in the future, the electric wiring of the load circuit to be controlled is newly newly added. Construction will be necessary, and future cost increases are expected.

In addition, when focusing on the control target, control is performed in units of load circuits. Therefore, when there are multiple load devices connected to the load circuit, the load device Of these, when it is not possible to control only some of the load devices and control only some of the load devices, there is duplication from another branch switch to a load device that does not perform control. Therefore, depending on the conditions of use, double electrical wiring is required, which increases the construction cost and increases the amount of resources used.

Furthermore, the rated capacity of the controlled object depends on the rated capacity of the relay built in the overcurrent detection device, and the load device desired by the user cannot always be controlled. In other words, if there are multiple load devices connected to the load circuit to be controlled and the power consumption of the load device exceeds the rated capacity of the relay, separate electrical wiring is prepared and each load device to be controlled is electrically connected. There was a problem that it was necessary to construct the wiring, and the construction cost increased and the amount of resources used increased. Also, since the load circuit power is directly turned off / on, the load circuit can be turned on / off for any load device that can be turned on / off by turning the load circuit power off / on. However, for devices such as general air conditioners and floor heaters that do not automatically operate when the load circuit changes from a power failure state to a power recovery state, for example, perform turn-on control after the shutdown control. However, it was not in the operating state, and it was necessary to perform it manually to put the load equipment in the operating state.

Therefore, the present invention can reduce the size of the overcurrent detection device, particularly the width in the width direction, regardless of the power capacity of the load device to be controlled. The installation space can be saved, the existing electrical wiring can be used as it is, and it can be used as it is. In the future home renovation, the electrical wiring can be changed to the minimum, saving the construction. It is an object of the present invention to provide an overcurrent detection device that is excellent in control, can individually control a plurality of load devices, and has high control convenience.

In order to achieve the above-described object, according to claim 1 of the present invention, in an overcurrent detection device installed in a distribution board, a power input terminal connected to a branch line as in a branch switch, and the branch A mounting portion that is attached to the inner bottom where the switch is disposed, a current sensor connecting portion that connects a current sensor that detects a current flowing in the electric circuit, and a current at a predetermined level based on a signal from the current sensor A determination unit for determining whether or not a current flows, a control unit for controlling operation of a load device by an HA control signal according to a determination result from the determination unit, and an HA terminal unit for outputting an HA control signal from the control unit And a display / notification unit connection unit connected to a display / notification unit for displaying the determination result by the determination means stepwise and by voice, wherein the display / notification unit connection unit is a four-core communication line While using 4-core Of the communication lines, one communication line is used as a common ground line, one communication line is used as the voltage electrode of the speaker, and the remaining two communication lines are configured to control lighting / extinguishing of three LEDs. An overcurrent detection device is provided.

According to such a configuration, since it is not necessary to provide a relay in the body of the overcurrent detector, the size of the body can be reduced, the installation space in the distribution board can be saved, and the load equipment can be operated. Because no electrical wiring is used for control, control can be performed without changing the existing electrical wiring, and it is excellent in work-saving work and can control multiple load devices individually. It can be set as the structure with the high convenience of control.

The HA terminal portion is disposed on the side surface of the container constituting the overcurrent detection device with the terminal connecting portion facing the distribution board toward the front side. May be configured.

As a result, even if the overcurrent detection device is installed in parallel with the branch switch in the distribution board, the number of branch switches that need to be replaced can be reduced as much as possible, and the HA terminal When wiring the control line to the part, it can be plugged in from the front facing the distribution board, so that it can be constructed with excellent wiring workability.

In addition, when the determination unit determines that the predetermined level of current is flowing in the electric circuit, the control unit outputs an HA control signal for controlling the power supply of the connected load device to be cut off. When the control unit determines that the current of the predetermined level does not flow through the electric circuit, the control unit outputs an HA control signal for controlling the power-on of the connected load device. An apparatus may be provided.

As a result, the load device to be controlled can be controlled even if it does not automatically enter the operating state when the power failure state returns to the power recovery state. A highly convenient configuration can be obtained.

In addition, an overcurrent detection device is provided in which a plurality of the HA terminals are provided, and a plurality of load devices are controlled in a step-by-step manner according to the magnitude of the current flowing in the electric circuit by the determination unit. May be.

As a result, if the overcurrent continues in the circuit, if the overcurrent state cannot be resolved simply by turning off the power supply of the first load device, the power supply of the second load device is turned off. It can be set as the structure which can aim at cancellation | release and reset of an overcurrent state effectively by carrying out interruption | blocking control of the power supply of four load apparatuses.

According to the present invention, regardless of the power supply capacity of the load device to be controlled, the size of the overcurrent detection device, particularly the width in the width direction, can be reduced, and the distribution board Installation space can be saved, and existing electrical wiring can be used as it is without modification, and changes in electrical wiring can be minimized during future home renovations, saving construction. Therefore, it is possible to provide an overcurrent detection device that is excellent in performance and can individually control a plurality of load devices and has high control convenience.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 to 4 show a first embodiment of the present invention. First, the external structure of the overcurrent detection device of the present invention will be described.

An overcurrent detection device 1 of the present invention is shown in FIGS. The overcurrent detection device 1 has power input terminal portions 101 and 102 connected to a branch line for connecting a branch switch, and a midsole where the branch switch is disposed outside the body constituting the outer shell. A mounting portion 103 to be mounted, a current sensor connecting portion 104 for connecting a current sensor 109 for detecting a current flowing in the electric circuit, and HA terminal portions 107a to 107d for outputting an HA control signal for controlling the operating state of the load device, Whether to display the state of the current flowing in the electric circuit and the display / notification unit connection unit 108 connected to the display / notification unit 110 for notifying the surroundings of the control state of the load device and the control operation of the overcurrent detection device 1 Current detection method switching that switches the current detection method depending on the presence or absence of a threshold current setting unit 105 that determines a threshold current for determining whether or not the current limiter is installed according to each electric power company. And the Department, the is provided.

If a current limiter is provided by switching the current detection method, the signal from the current sensor is vector-summed by a calculation process inside the microcomputer, which will be described later, and the current limiter is not provided. Detects a large value in the signal from the current sensor.

An electronic circuit board on which electronic components and the like are mounted is stored inside the container, and has a predetermined size based on the output from the current sensor 109 and the threshold current information determined by the threshold current setting unit 105. A determination unit 111 that determines whether or not the current of the current flows in the electric circuit, and a control unit 112 that controls the operation of the load device by the display / notification unit 110 or the HA control signal according to the determination result from the determination unit 111; Is provided. The HA refers to home automation, which conforms to the JEM-A terminal defined by the Japan Electrical Manufacturers' Association.

FIG. 2 shows an internal configuration diagram with the cover of the distribution board 2 provided with the overcurrent detection device 1 removed, and the connection between the display / notification unit and the load device. In the distribution board 2, the main switch 202 is connected to the load side of the current limiter 201, and the branch switch 203 is disposed on the load side of the main switch 202 via a bus ( The current limiter is not shown). Further, according to the wiring length between the overcurrent detection device 1 and the load device, an IFU (interface unit) determined when the HA terminal is provided is appropriately provided.

The branch switch 203 and the overcurrent detection device 1 are connected to a branch line (not shown) provided on the bus and are supplied with power.

Further, the branch switch 203 and the overcurrent detection device 1 are attached to the inner bottom by the attachment portion 103. The attachment portion 103 extends downward from the container body by being pushed down in FIG. 1, and engages with a recess provided in the inner bottom.

The HA terminal portions 107a to 107d are arranged on the right side surface of the container body so as to face the distribution board with the connection portions of the terminals facing in front. In this embodiment, four terminals are provided so that up to four devices can be controlled. In addition, the power supply terminal portion of the body is provided with a display / notification portion connection portion on the other end side, and is also arranged facing the distribution board with the connection portion of the terminal facing the front side. .

In order to arrange these terminals facing the front side, when installing the control lines such as the HA control signal, the operator faces the distribution board and connects the terminals on the control line side to the predetermined terminals from the front. Since the connection process is completed simply by plugging in and connecting, workability is extremely good.

In addition, the power supply of the said load apparatus can be obtained from the electrical outlet installed with the normal electrical wiring.

The display / notification unit includes a speaker unit as the notification unit 1102 and a display unit using a plurality of LEDs as the display unit 1101.

Next, FIG. 3 schematically shows an internal circuit in the body of the overcurrent detection device. FIG. 4 schematically shows an internal circuit of the display / notification unit.

In FIG. 3, the determination unit 111 and the control unit 112 are configured by a microcomputer, and the threshold current information determined by the output from the current sensor 109 and the threshold current setting unit 105 is set by a program stored in the microcomputer. On the basis of this, it is possible to determine whether or not a predetermined amount of current is flowing in the electric circuit, display / notification control of the display / notification unit 110 according to the determination result, and operation control of the load device by the HA control signal. Wear processing.

The threshold current data set by the threshold current setting unit 105 is input to the microcomputer. The threshold current is adjusted to the rated current of the current limiter 201 (for example, 60 A, 40 A, etc.) or the rated current of the main switch 202 (for example, 60 A, 40 A, etc.) in a power pipe that does not require the current limiter 201. To set.

The current sensor 109 (hereinafter referred to as CT) is disposed so as to penetrate the voltage pole (L1 phase, L2 phase) of the load side electric circuit of the main switch, and outputs an output signal corresponding to the magnitude of the current flowing through the electric circuit. To do. The CT 109 is connected to the current sensor connection unit 104, and the output signal is input to the microcomputer.

In the microcomputer, the determination unit 111 compares the input threshold current data with the output signal from the CT, calculates the ratio exceeding the threshold current by calculation, and calculates the ratio exceeding the threshold current. Accordingly, the time interval to be notified, the notification content, and the control start time of the load device are determined based on a predetermined condition, and an operation cutoff / return command for the load device is output to the control unit 112. A display / notification command to the display / notification unit 108 is output.

The predetermined conditions are shown in FIG. If the current in the electric circuit does not exceed the threshold current, voice notification and operation control of the load device are not performed, only LED display is performed, and the ratio of the magnitude of the current flowing in the electric circuit to the threshold current is determined. To turn on / off. When the current in the electric circuit exceeds the threshold current, sound notification and operation control of the load device are performed according to the ratio of the excess rate. Further, the display blinks all the LEDs at the same time so that the surroundings can recognize that the current in the electric circuit exceeds the threshold current.

Next, a schematic internal circuit of the display / notification unit 110 shown in FIG. 4 will be described. In this internal circuit, a four-core communication line is used for communication between the overcurrent detection device 1 and the display / notification unit 110. Three LEDs and a speaker are controlled by the four-core communication line.

Specifically, of the four-core communication lines, one communication line is used as a common ground line, one communication line is used as a voltage electrode of a speaker, and the remaining two communication lines turn on / off three LEDs. Turns off control. As shown in the figure, the wiring of LED1 to LED3 is connected as follows. LED1 and LED2 are respectively connected to the communication lines 1 and 2 on the anode side and to the ground line on the cathode side. The LED 3 is configured by connecting the anode side of the LED 3 to the anode side of the LED 2 and connecting the cathode side of the LED 3 to the anode side of the LED 1 between the LED 2 and the anode side line of the LED 3.

By connecting in this way, when receiving display control from the control unit 112, as shown below, when the control signal of the communication line 1 is Lo level and the control signal of the communication line 2 is Hi level, When only the LED 1 is lit, the control signal of the communication line 1 is Hi level, and the control signal of the communication line 2 is Hi level, only the LED 1 and LED 2 are lit, the control signal of the communication line 1 is Hi level, and the communication line When the control signal 2 is at the Lo level, control can be performed so that all of the LEDs 1, LED2, and LED3 are turned on. Usually, each LED is provided with a communication line for turning on / off. In some cases, a total of five communication lines are required, but the number of communication lines can be reduced, and a configuration that contributes to reduced workability can be achieved.

The control unit 112 that has received an instruction to shut down / return the load device from the determination unit 111 outputs a HA control signal to the load device connected to the HA, and stops / returns the operation state of the corresponding load device. Do. In conjunction with the HA control, the display / notification unit 108 that has received a display / notification command displays in steps the ratio of the magnitude of the current flowing in the electric circuit to the threshold current at that time in the electric circuit. Depending on the size of the ratio exceeding the threshold current, a voice notification such as “Too much electricity used / Soon to turn off / Turned off power” is performed.

It should be noted that the present invention is not limited to the embodiment, and can be freely improved and modified as necessary without departing from the gist of the invention.

For example, when the ratio of the magnitude of the current flowing in the electric circuit with respect to the threshold current exceeds a predetermined magnitude, when the HA control signal is output from the HA terminal, the plurality of HA terminals 107a to 107d shown in FIG. Are arranged in the order of outputting the HA control signal from the left direction or the right direction, and arranged so as to clearly indicate the control order. The clarification method may be to paste the nameplate on the side of the container to clearly indicate the control order, or to mark the container itself to indicate the control order.

By continuously arranging the HA terminals in this way, when the control order of the load devices to be controlled is determined, it is possible to connect in order, reducing connection errors as much as possible, and wiring. The effect that the convenience of work increases can be expected.

Further, when the threshold current is set, the overcurrent detector 1 always detects the current flowing through the electric circuit, and the ratio of the magnitude of the current flowing through the electric circuit with respect to the threshold current is provided inside the container. The microcomputer is determined by calculation of the microcomputer 111, and the load device to be controlled and the display / notification unit 110 are voluntarily controlled according to the magnitude of the ratio, and the microcomputer of the overcurrent detector 1 is controlled. For example, the magnitude of the current flowing through the circuit, the magnitude of the threshold current, the presence or absence of a current limiter, the control status of the load device being controlled (the first load device is in operation) , The second load device is in an operation stop state, etc.) provided with an output unit (see 120 described in FIGS. 6 to 7) connected to the microcomputer, and an overcurrent detection device Outside the distribution board where 1 is installed Oite also, it may be obtained the electrical information. Thereby, not only the display and notification in the display / notification unit 110 but also electrical information in the electric circuit can be acquired and utilized in other media.

For example, since not all the residents in the house where the overcurrent detection device 1 is installed are in the house, the output signal from the output unit is transmitted to the residents outside the house. It can be assumed that the electrical information in the dwelling can be recognized by transmitting by means and receiving the output signal by the resident. In addition, by transmitting the electrical information to a third party such as an electric power company or a consultant company, a survey on the state of use of electricity in individual houses or the operating status of load equipment controlled by HA is performed. In addition, it is possible to survey the operating status of specific load equipment.

In addition to the output unit, an input unit for transmitting a control signal to the control unit in the microcomputer and outputting an HA control signal, for display control of the display / notification unit 110, and for notification control (FIG. 6). (See 120 in FIG. 7) to control the operation of the load device to be controlled in the house or from the outside of the house, or to control the display and notification in the display / notification unit 110. It may be configured. Note that the sound data to be notified from the notification unit may be stored in advance in the microcomputer as an assumed sound.

As voice data, “This is a XX power company. It seems to be using too much electricity, so we will stop the operation of load 1.” or “This is a XX company. Insufficient power in the surrounding area. Therefore, the operation of load 1 will be stopped. "

Specifically, as the output unit / input unit, a serial communication unit using RS-232C is provided, or a communication unit based on the Ethernet (registered trademark) system defined by IEEE802.3 is provided. You may comprise so that it can connect to a residential LAN. In addition, a specific low-power radio or a wireless communication unit such as a wireless LAN method may be provided. These communication units may be configured to be housed in the container, and as shown in FIGS. 6 to 7, the width of the container is larger than that of the overcurrent detection device 1 described in FIG. A large space ensures a storage space. 1 may be realized by reducing the size and configuring the chip by mounting components on the board circuit or by software processing.

The two-way communication between the outside of the house and the overcurrent detection device 1, for example, by accumulating electricity usage data in the house over time, the electric power company can obtain the most suitable electricity charge for the house. It is possible to propose a plan. In addition, consulting firms can encourage energy conservation in relation to environmental issues, depending on the usage of electricity.

In other words, at present, electric power companies and consulting firms propose electric rate plans according to the usage status of electricity in individual houses and the usage status of specific load equipment, and specify specific load equipment according to the balance of power supply and demand. However, it is difficult to control the power supply actively, but by using this overcurrent detection device 1, it is possible to easily know the usage status of electricity and usage status of specific load equipment in each house. As mentioned above, it is possible to propose an electricity rate plan according to the usage status of electricity and the usage status of specific load devices, and to control specific load devices according to the balance of power supply and demand. In addition, there is a possibility that a new service can be provided to a third party outside the house.

In addition, there is an effect that a resident can perform operation stop / return control of a specific load device without going to a place where the switch of the load device is provided. For example, when a residential LAN is connected to the Internet and the overcurrent detection device 1 is provided to be accessible via the Internet, or from the Internet side via a gateway or server provided in the house. When the information held by the current detection device can be acquired, the electrical information can be acquired by using a terminal (such as a personal computer or a mobile phone) that can be connected to the Internet network. Based on the acquired information Therefore, it is possible to stop / return the operation of a specific load device.

The present invention can be applied to an internal unit used in a distribution board. The distribution board can be applied not only to residential distribution boards but also to industrial distribution boards to provide a highly convenient overcurrent detection device for both residential and industrial use.

External view of overcurrent detection device Internal configuration diagram of distribution board with overcurrent detection device Internal circuit diagram of overcurrent detection device Internal circuit diagram of overcurrent detection device Operating conditions according to the ratio between the threshold current and the current flowing in the circuit Example of an overcurrent detection device configured with a communication unit Example of distribution board with an overcurrent detection device configured with a communication unit

DESCRIPTION OF SYMBOLS 1 Overcurrent detection apparatus 101 Power supply terminal part 102 Power supply terminal part 103 Attachment part 104 Current sensor connection part 105 Threshold current setting part 106 Current detection system switching part 107 HA terminal 108 Display / notification part connection part 109 Current sensor (CT)
110 Display / notification unit 1101 Display unit 1102 Notification unit 111 Determination unit 112 Control unit 120 Signal input / output unit 2 Distribution board 201 Current limiter 202 Main switch 203 Branch switch

Claims (4)

In the overcurrent detection device installed in the distribution board,
A power input terminal connected to the branch line in the same manner as the branch switch;
A mounting portion to be mounted on the bottom of the branch switch;
A current sensor connection for connecting a current sensor for detecting a current flowing in the electric circuit;
A determination unit for determining whether or not a predetermined level of current is flowing in the electric circuit based on a signal from the current sensor;
A control unit that controls the operation of the load device by an HA control signal according to a determination result from the determination unit;
An HA terminal for outputting an HA control signal from the control unit;
A display / notification unit connection unit connected to a display / notification unit for stepwise display and voice notification of the determination result by the determination unit;
With
While the display / notification unit connection unit uses a 4-core communication line,
Of the four-core communication lines, one communication line is used as a common ground line, one communication line is used as the voltage electrode of the speaker, and the remaining two communication lines control lighting / extinguishing of three LEDs. An overcurrent detection device characterized by comprising.
The HA terminal portion is provided on the side surface of the body constituting the overcurrent detection device.
The overcurrent detection device according to claim 1, wherein the overcurrent detection device is arranged with the connection portion of the terminal facing the distribution board toward the front side.
When the determination unit determines that the predetermined level of current is flowing in the electric circuit,
The control unit outputs an HA control signal for controlling to cut off the power supply of the connected load device,
When the determination unit determines that the predetermined level of current is not flowing in the electric circuit,
The overcurrent detection device according to claim 2, wherein the control unit outputs an HA control signal for controlling power-on of a connected load device.
A plurality of the HA terminals are provided,
The overcurrent detection device according to claim 3, wherein the determination unit performs power-on / off control of a plurality of load devices in a stepwise manner according to the magnitude of the current flowing in the electric circuit.

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