JPH11122801A - Load controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a load controller in which a main breaker can be prevented from being interrupted by some extent even it power supply to a load machine is not turned off through a control means. SOLUTION: A control 1 means 21 opens the relays 4 in a switching means 3 provided for a load machine according to a priority when the current flowing into a main breaker B and detected by a main circuit current detecting means 1 exceeds a specified level and closes the relays 4 according to a specified order. When the current flowing into a branch breaker E connected with a load machine provided with no switching means 3 and detected by a branch main circuit current detecting means 11 exceeds a specified level, a prealarm indication LED 20 is flickered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load control device that suppresses a total power failure by turning off power to a specific load device when a current flowing through a main breaker exceeds an allowable level. About.

[0002]

2. Description of the Related Art Conventionally, in a house, a building, or the like, when a current value flowing through a main breaker exceeds a predetermined level, power supply to a specific load device is turned off to prevent the main breaker from being shut off. There is a load control device that suppresses a total power failure. This load control device, for example,
This is disclosed in JP-A-8-205380, which will be described with reference to FIG.

FIG. 5 is a block diagram showing a conventional load control device. In the figure, A is a load control device, B is a main breaker, C is a main circuit line on the load side of the main breaker B, D
Is a branch breaker connected to the main circuit line C. Also,
Reference numeral 1 denotes main circuit current detecting means for detecting a current flowing through the main circuit breaker B, and has a current transformer 2 which outputs a signal proportional to the current flowing through the main circuit line C. Reference numeral 3 denotes a switching means having a relay 4 between the branch breaker D and the load equipment for turning on and off the power supply to the load equipment, and having a relay 4 whose opening priority is determined. Reference numeral 5 denotes a detection current detected by the main circuit current detection means 1. Control means for controlling the relay 4 of the opening / closing means 3 based on the value. Reference numeral 7 denotes level setting means for setting a predetermined level of a current value for turning off the power supply to the load device, and reference numeral 8 denotes priority setting means for setting the priority of the relay 4 to be opened.

FIG. 6 is a schematic diagram showing a level setting means, a priority setting means, and a control means of a conventional load control device. In the figure, 5, 7, and 8 are the same as those in FIG. 7a is a movable part of the level setting means 7, and 8a is a dial which is a movable part of the priority setting means 8. FIG. 7 is a front view showing a conventional load control device. In the figure, 7 and 8 are the same as those in FIG. In such a conventional load control device, a predetermined level is stored in the control unit 5 in advance, and when the main circuit current detection unit 1 detects that a current larger than the predetermined level has flowed through the main breaker B, Under the control of the control means 5, the energization to the load device connected to the relay 4 having the higher priority of turning off (opening) is turned off by the opening / closing means 3. Further, the predetermined level of the current value for turning off the current to the load device and the priority of the relay to be opened are shown in FIG.
Can be set by the movable parts 7a and 8a of the level setting means 7 and the priority setting means 8 shown in FIG. When the current flowing through the main breaker B falls below the return level stored in the control means 5 for a predetermined time due to turning off the power supply to the load device, the control means 5 controls the priority order by controlling the control means 5. The opening / closing means 3 turns on the power supply to the load device connected to the slow relay 4.

[0005]

The conventional load control device can set and store a predetermined level and priority in a compact configuration, so that the setting and storage can be easily changed and the device is easy to use. It is. However, the conventional load control device detects only the current of the main breaker B (does not detect the current of the branch breaker D). Therefore, when the current flowing through the main breaker B exceeds a predetermined level, the main breaker B is shut off. In order to prevent this, the power supply to the load equipment must be turned off, and if the current flowing through the main breaker B does not fall below the reset level after the power supply to the load equipment is turned off, the power supply to this load equipment is turned off. To turn it on, manually turn off the other load devices,
There is a problem that the value of the current flowing through the master breaker B must be lower than the return level.

Since the priority order is set by the dial 8a, it is necessary to set the priority order by the dial 8a as the number of branch breakers D on / off controlled by the load control device increases. , The dial 8a becomes complicated. Furthermore, a different dial 8a
When the same priority is set in, the error detection and the change of the priority are required, and the setting work becomes complicated. further,
Branch breaker D on / off controlled by load control device
However, there is a problem that, depending on the load device connected to the device, the device may be turned off in accordance with the priority order even though the device is to be operated continuously.

The present invention has been made in order to solve such a problem, and a load control device capable of preventing a main breaker from being cut off to some extent without turning off the power supply to a load device by a control means. The primary purpose is to obtain. It is a second object of the present invention to provide a load control device that smoothly turns on energization of a load device whose energization has been turned off by a control unit. It is a third object of the present invention to provide a load control device that enables a load device to be used in a continuous mode.

[0008]

In a load control device according to the present invention, a first current detecting means for detecting a current flowing through a main breaker and a first branch breaker connected to the main breaker are provided. A switching means provided corresponding to the load equipment so as to control the energization of the plurality of load equipments and having a plurality of opening / closing parts determined in opening priority, and a load not provided with the main breaker and the opening / closing means Second current detecting means for detecting a current flowing through a second branch breaker connected to the device, and alarm means for outputting an alarm signal corresponding to a current value detected by the second current detecting means When the current value detected by the first current detecting means exceeds a first predetermined level, the opening / closing section of the opening / closing means is opened according to the priority order, and when the current value falls below the return level, the opening of the opening / closing means is opened. Together to close the opening and closing section in a predetermined order, in which a current value detected by the second current detection means comprises a control means for outputting an alarm signal to the alarm means when crossing a second predetermined level. In addition, a current selection unit is provided for selecting a current value detected by the first current detection unit and a current value detected by the second current detection unit and inputting the current value to the control unit.

[0009] Further, there is provided priority order setting means for setting the opening order of the opening / closing section of the opening / closing means. Further, the priority setting means selects and sets each of the open / close sections from a plurality of predetermined priorities. The priority order setting means can set a continuous mode in which the opening / closing section is not opened.

[0010] Further, there is provided an opening / closing state notifying means having an opening / closing state notifying section provided corresponding to the opening / closing section so as to notify that the opening / closing section is opened and closed for each opening / closing section. . In addition, the opening / closing state notifying means is for notifying by a display.When the opening / closing section is opened, the corresponding opening / closing state notifying section is turned on and turned off when the opening / closing section is closed. When the current value detected by the first current detecting means exceeds the first predetermined level even when the switch is opened, the open / close state notifying section corresponding to the open / close section set to the continuous mode by the priority setting means is provided. It blinks.

Further, there is provided a return level setting means for setting a return level. The return level setting means sets the return level based on the position of the movable contact.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing a load control device according to an embodiment of the present invention.
In FIG. 1, A to D and 1 to 4 are the same as those of the above-described conventional apparatus, and the description thereof will be omitted. E is a branch breaker connected to a load device whose energization is not turned on / off by a relay, and F is a branch circuit line on the load side of the branch breaker E. Reference numeral 11 denotes a branch circuit current detecting means for detecting a current flowing through the branch breaker E, and has a current transformer 12 which outputs a signal proportional to the current flowing through the branch circuit line F. Reference numeral 13 denotes a current selection unit which receives a plurality of current values detected by the current transformers 2 and 12, and sequentially outputs the current values one by one every 0.2 seconds, for example, according to a control signal of a central control unit described later. Is an amplifier for amplifying the signal level of the detected current value output from the current selection unit 13, and its output is input to a central control unit described later. Reference numeral 16 denotes priority order selection means for setting the priority order of the relays 4 to be opened, and details thereof are shown in FIG. 1
Reference numeral 7 denotes a return level setting means for setting a return level for turning on the power supply to the load device, and details thereof are shown in FIG. A display means 18 is provided corresponding to the relay 4 and is turned on and off when the relay 4 is opened and closed.
An ED 19 and a pre-alarm display LED 20 provided corresponding to the current transformer 12 and blinking while the detected current value of the branch circuit line F exceeds a predetermined level.

The control means 21 controls the opening / closing means based on the detected current value of the main circuit line C input from the amplifier 14, the priority selected by the priority selection means 16 and the return level set by the return level setting means 17. 3, stop display LED1
9 for controlling the pre-alarm display LED 20 on the basis of the detected current value of the branch circuit line F input from the amplifier 14 in the same manner.
A relay opening control unit 23 for opening the relay 4;
And a relay closing control unit 24 for closing the relay 4. The central control unit 22 sends a control signal to the relay opening control unit 23 when any one of the detected current values of the main circuit line C input from the amplifier 14 exceeds a predetermined level.
And the stop display LED 19 is turned on to turn on the stop display LED 19. If the detected current value is lower than the return level, the control signal is similarly transmitted to the relay closing control unit 24 and the stop display LED.
19 to turn off the stop display LED 19. When the priority is “continuous operation”, the control signal is not output to the relay opening control unit 23 and the stop display L
The ED 19 blinks until the detected current value falls below the recovery level. Further, the central control unit 22 outputs a control signal to the pre-alarm display LED 20 when the detected current value of the branch circuit line F input from the amplifier 14 exceeds a predetermined level.

The relay opening control unit 23 includes a central control unit 22
When a control signal is input, priority order selecting means 1
The opening signal is output so that the relay 4 having the higher priority set in Step 6 performs the opening operation. Even if one relay 4 is opened, the detected current value of the main circuit line C exceeds a predetermined level. Outputs an opening signal so that the next higher priority relay 4 performs an opening operation. When the priority is set to “continuous operation”, no opening signal is output to the relay 4 corresponding to the branch circuit. The relay closing control unit 24 outputs a closing signal such that when a control signal is input from the central control unit 22, the relay 4 having the lower priority set by the priority selector 16 performs a closing operation. If the detected current value of the main circuit line C does not exceed the predetermined level even if one relay 4 is closed, a closing signal is output so that the next lower priority relay 4 performs the closing operation. .

FIG. 2 is a schematic diagram showing priority order selecting means, return level setting means, and control means of the load control device according to the embodiment of the present invention. In FIG.
Reference numerals 7 and 21 are the same as those in FIG. The priority set by the priority selection means 16 is determined by the control means 2
1, the movable contact 16a is slid, and depending on the position of contact with a different fixed contact 16b, the control means 21
By recognizing which port 21a has reached the Hi level (Vcc level), it is determined whether the power supply to the load device is OFF, "after", "continuous operation". That is,
For one setting by the priority selection means 16, the control means 21 has two ports 21a and one port 2a.
When 1a is at the Hi level, it is either "before" or "after", and when both ports 21a are at the L level, it is recognized as "continuous operation".

The return level set by the return level setting means 17 is input to the control means 21.
a is a variable dial type that sets the return level by rotating the movable contact 17a, and the control means 21 determines which port 21a has become the Hi level by the position contacting the different fixed contact 17b by rotating the movable contact 17a. By recognizing, the return level becomes “50” of the rated current of the main breaker B.
%, "60%", "70%", "80%", and "90%".

FIG. 3 is a front view of the load control device according to the embodiment of the present invention. In FIG. 3, 16, 17,
Reference numerals 19 and 20 are the same as those in FIG. FIG. 4 is an explanatory diagram showing the current flowing through the main breaker when the load control device according to the embodiment of the present invention is used.
The return level in FIG. 4 can be raised and lowered in the direction of the arrow by changing and setting the return level setting means 17. In the load control device A according to the embodiment of the present invention, the current value flowing through the main breaker B connected to the plurality of branch breakers D and E connected to the load device is determined at a predetermined level (predetermined based on the rated current). Is exceeded, the power supply to a specific load device is turned off, or when the current flowing through the branch breaker E exceeds a predetermined level (predetermined based on the rated current), an alarm is issued. The display, for example, blinks the pre-alarm display LED 20. The main circuit current detection means 1, the branch circuit current detection means 11, the switching means 3, the current selection unit 13, the control means 21, the priority selection means 16 , Return level setting means 17 and display means 1
8 are the main constituent members. FIG. 1 shows a load control device A and a main breaker B housed in a distribution board of a house or the like.
And the configuration of a branch breaker D and a branch breaker E. The main breaker B is connected to a single-phase three-wire type electric circuit. At the start of use of the load control device A, the relays 4 are all closed. In the case of FIG. 3, six branch breakers D are connected.

Next, the operation will be described. First, the priority of the relay 4 to be opened by the priority selection means 16 is set, and the return level for turning on the power supply to the load device is set by the return level setting means 17. The priority setting is
With the switch provided for each circuit, considering the priority,
Select from "Saki", "After" and "Continuous operation". The return level is set to the desired return level by rotating the dial. In the example of FIG. 3, the priority order is circuit 1 → circuit 5 → circuit 3 → circuit 4 → circuit 6, and the circuit 2 is in continuous operation and excluded from switching. The return level is 50% of the rated current. After such an initial setting, the main circuit current detecting means 1 detects the current flowing in the main circuit line C on the load side of the main breaker B,
The branch circuit current detecting means 11 detects a current flowing in the branch circuit line F on the load side of the branch breaker E. The detected current value is input to the control means 21 after the signal level is amplified by the amplifier 14 one by one in the current selection unit 13 one by one.

Operation Example 1 If any one of the currents flowing through the main circuit line C exceeds the predetermined level stored in the control means 21, the relay opening control section 23 corresponding to the circuit 1 in FIG. Control signal is input, the relay 4 opens, and the stop display LED 1
9 starts lighting. If the level exceeds a predetermined level even when the relay 4 corresponding to the circuit 1 is opened, the relay 4 corresponding to the circuit 5 is opened, and thereafter, the order of the circuit 3 → the circuit 4 → the circuit 6 until the level falls below the predetermined level. To open the relay 4 and turn on the stop display LED 19 each time. Circuit 6
The relay 4 of the circuit 2 is not opened even if the voltage does not fall below the predetermined level by opening the relay 4 corresponding to the above condition, but the stop display LED 19 corresponding to the circuit 2 blinks as a means for notifying that the voltage exceeds the predetermined level. Let it. If it is desired to delay the turning off of the current of the circuit 5, the priority of the circuit 5 may be set to "later". In this case, the priority is circuit 1 → circuit 3 → circuit 4 → circuit 5 → circuit 6. . Of course, if "continuous operation" is set, it can be excluded from the control target. Thus, the change of the priority is always accepted even when the load control device A is operating.

After opening the relay in this manner, the current flowing through the main circuit line C in the example of FIG.
%, First, the stop display LED corresponding to the circuit 2
Then, the control signal is inputted from the central control unit 22 to the relay closing control unit 24 corresponding to the circuit 6, the relay 4 is closed, and the stop display LED 19 is turned off. Even if the relay 4 is closed, as long as the current flowing through the main circuit line C does not exceed a predetermined level, the priority order is reversed, that is,
The relay 4 is closed in the order of the circuit 4, the circuit 3, the circuit 5, and the circuit 1, and the corresponding stop display LED 19 is turned off. If it is desired to turn on the power of the circuit 5 earlier, the priority of the circuit 5 may be set to “later”. In this case, the order in which the relays 4 are closed is as follows: circuit 6 → circuit 5 → circuit 4
→ Circuit 3 → Circuit 1 If the current flowing through the main circuit line C does not fall below 50% of the rated current even if the relay 4 is opened, and as a result the energization of the load device is not turned on, the return level setting means 17 The return level may be increased by operating.

The current flowing through the branch circuit line F is:
If the predetermined level stored in the control means 21 is exceeded, the pre-alarm display LED 20 corresponding to the circuit blinks. This blinking continues until the power consumption is suppressed and the current value falls below a predetermined level. Note that there is no correlation between the opening / closing operation of the relay 4 and the operation of the stop display LED 19 and the operation of the pre-alarm display LED 20, and each of them is independent of one load control device A.
It is only stored in.

Operation Example 2 If any one of the currents flowing through the main circuit line C exceeds the predetermined level stored in the control means 21, as shown in FIG. 4, the current exceeds the predetermined level at time t1 and its duration T12 is cut off. At time t2, which is a time corresponding to the operating characteristics of the switch, a control signal is input from the central control unit 22 to the relay opening control unit 23 corresponding to the circuit 1 in FIG. 3, the relay 4 is opened, and the stop display L
The ED 19 starts lighting. Relay 4 corresponding to circuit 1
Even if is opened, if the current exceeds a predetermined level for a predetermined time T23 (for example, several seconds), at time t3, the circuit 5
The relay 4 corresponding to the above is opened. In the case of FIG. 4, the opening of the circuit 5 causes the current to fall below a predetermined level.

If the current flowing through the main circuit line C falls below the reset level for a predetermined time T45 (for example, several minutes) after the relay is opened, the stop display LED 19 corresponding to the circuit 5 is turned off. A control signal is input from the central control unit 22 to the relay closing control unit 24 corresponding to the circuit 5, and the relay 4 is closed. Thereafter, if the current does not exceed the predetermined level for a predetermined time t6 (for example, several seconds), the circuit 1 is closed and the corresponding stop display LED 19 is turned off. Therefore, depending on the total power consumption of the load devices connected to the main breaker B, the time between the return level and the predetermined level (between times t3 and t4) may become longer after the operation of the load control device. In this case, the load device once turned off cannot be operated for a long time. However, since the return level can be changed, such a problem is also solved.

In this embodiment, the central control unit 22 outputs a control signal when any one of the currents flowing through the main circuit line C exceeds a predetermined level. The control signal may be output when the sum of the detected current values obtained by the flower 2 exceeds a predetermined level. Further, in this embodiment, the case where there is the continuous operation mode has been described, but it may not be provided. Further, in this embodiment, a relay is used for turning on / off the energization of the load device. However, the present invention is not limited to this. For example, using a home automation (HA) terminal to start / stop the load device May be performed.

Further, in this embodiment, the current detecting means is provided separately from the main breaker B or the branch breaker E, but may be incorporated in the main breaker B or the branch breaker E, respectively. Further, in this embodiment, the stop display and the pre-alarm display are LEDs, but in addition to or in place of this, the status may be notified by voice or buzzer sound.

[0026]

Since the present invention is configured as described above, it has the following effects. When the current value detected by the first current detecting means for detecting the current flowing through the main breaker exceeds a first predetermined level, the opening / closing section of the opening / closing means provided corresponding to the load device is opened according to the priority order. When the current value is lower than the return level, the opening / closing section of the opening / closing means is closed in a predetermined order, and a second current for detecting a current flowing through a branch breaker connected to a load device having no opening / closing means is provided. When the current value detected by the current detection means exceeds the second predetermined level, the control means for outputting a warning signal to the warning means is provided, so that the current value of the load equipment having no switching means is detected and By being able to respond, the number of times that the opening / closing means opens and closes can be reduced. Further, a current selection unit that selects a current value detected by the first current detection unit and a current value detected by the second current detection unit and inputs the current value to the control unit is provided. Since the input to the control means is shared, the device can be made compact.

Also, since the priority order setting means for setting the opening order of the opening / closing section of the opening / closing means is provided, the opening order of the opening / closing section can be changed as appropriate. Further, the priority order setting means selects and sets for each opening / closing unit from a plurality of types of predetermined priorities, so that the priority order can be easily set. Further, the priority order setting means is capable of setting a continuous mode in which the opening / closing section is not opened, thereby enabling continuous operation.

Further, since the open / close section is provided with an open / close state notifying section provided corresponding to the open / close section so as to notify each open / close section that the open / close section has been opened and closed, the open / close section is provided. The state can be known outside. in addition,
The opening / closing state notifying means is for notifying by display, and when the opening / closing section is opened, the corresponding opening / closing state notifying section is turned on and turned off when the opening / closing section is closed. Even when the current value detected by the first current detecting means exceeds the first predetermined level, the open / close state notifying section corresponding to the opening / closing section set to the continuous mode by the priority order setting means blinks. Therefore, it is possible to notify even the load devices that are continuously operated.

Also, the apparatus is provided with a return level setting means for setting a return level, and the return level can be changed at any time, so that the opening / closing section cannot be closed because the current flowing through the main breaker does not fall below the return level. Is improved. Since the return level setting means sets the return level based on the position of the movable contact, the return level can be set by a simple operation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a load control device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing priority order selecting means, return level setting means, and control means of the load control device according to the embodiment of the present invention.

FIG. 3 is a front view of the load control device according to the embodiment of the present invention.

FIG. 4 is an explanatory diagram showing an energizing current of a main breaker when the load control device according to the embodiment of the present invention is used.

FIG. 5 is a block diagram showing a conventional load control device.

FIG. 6 is a schematic diagram showing level setting means, priority setting means, and control means of a conventional load control device.

FIG. 7 is a front view showing a conventional load control device.

[Explanation of symbols]

A load control device, B main breaker, C main circuit line,
D branch breaker, E branch breaker, F branch circuit line, 1 main circuit current detecting means, 2 current transformer, 3 switching means, 4 relay, 11 branch circuit current detecting means, 12
Current transformer, 13 current selection unit, 14 amplifier, 16 priority selection unit, 17 return level setting unit, 18 display unit, 19 stop display LED, 20 pre-alarm display LED, 21 control unit, 22 central control unit, 23 relay Opening control unit, 24 relay closing control unit.

Claims (9)

[Claims] A first current detecting means for detecting a current flowing through a main breaker, and a load device for controlling energization to a plurality of load devices connected to a first branch breaker connected to the main breaker. And a second branch breaker connected between the main breaker and a load device not provided with the opening / closing means, the opening / closing means having a plurality of opening / closing portions provided with opening priorities. A second current detecting means for detecting a current flowing through the alarm means, an alarm means for outputting an alarm signal corresponding to a current value detected by the second current detecting means, and a current value detected by the first current detecting means. When the current value falls below a reset level, the opening / closing portions of the opening / closing means are closed in a predetermined order when the current value falls below the reset level. A load control device, further comprising control means for causing the warning means to output a warning signal when the current value detected by the second current detection means exceeds a second predetermined level. 2. A current selection unit for selecting a current value detected by the first current detection unit and a current value detected by the second current detection unit and inputting the current value to the control unit. 2. The load control device according to 1. 3. The load control device according to claim 1, further comprising priority setting means for setting the opening order of the opening / closing section of the opening / closing means. 4. The load control device according to claim 3, wherein the priority setting means selects and sets, for each opening / closing unit, from a plurality of types of predetermined priorities. 5. The load control device according to claim 3, wherein the priority setting means can set a continuous mode in which the opening / closing section is not opened. 6. An opening / closing state notifying means having an opening / closing state notifying section provided corresponding to the opening / closing section so as to notify that the opening / closing section is opened and closed for each opening / closing section. The load control device according to any one of claims 1 to 5, wherein 7. An opening / closing state notifying means for notifying by a display, turning on and off the corresponding opening / closing state notifying section when the opening / closing section is opened and turning off the opening / closing section when the opening / closing section is closed, and setting the priority order of the opening / closing section. When the current value detected by the first current detecting means still exceeds the first predetermined level even when all the switches are opened, the opening / closing state notification corresponding to the opening / closing section set to the continuous mode by the priority order setting means. 7. The load control device according to claim 6, wherein the unit is caused to blink. 8. The load control device according to claim 1, further comprising a return level setting means for setting a return level. 9. The return level setting means sets the return level according to the position of the movable contact.
The load control device as described in the above.