JPH1183904A - Watthour meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a watthour meter capable of effectively and economically supplying electric power. SOLUTION: A watthour meter 14 is provided with the following; a first output terminal 16 for supplying electric power from an electric power supplying equipment 2 to a load 15, a second output terminal 19 for supplying electric power from the electric power supplying equipment 2 to a load 17 via a switching means 20 which load is different from the load 15, electric power detecting means 9-11 for,detecting electric energy consumed in the load 15 and the other load 17, and a controlling means 23 which compares the electric energy detected by the electric power detecting means 9-11 with a reference control value at every definite cycle, opens the switching means 20 when the electric energy exceeds the reference control value, and closes the switching means 20 when the electric energy is lower than the reference control value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a watt hour meter for measuring the amount of power used by a power demanding facility such as a general household, and more particularly, to a load that consumes power to adjust the amount of power used. The present invention relates to a watt hour meter for controlling connection / disconnection of a power supply.

[0002]

2. Description of the Related Art There is a watt-hour meter as an apparatus for measuring the amount of power used by a power demanding facility such as a general household. FIG.
Is a block diagram showing a configuration of a conventional watt-hour meter. Hereinafter, a case where this watt-hour meter 1 is used in a general household will be described as an example.

The watt-hour meter 1 is connected to an input terminal 4 via power supply equipment 2 such as a telephone pole or the like and distribution lines 3a and 3b.
And a load 5 in a general home, which is a power demanding facility, and an output terminal 7 via distribution lines 6a and 6b. Here, the distribution lines 6a and 6b are stretched inside a general home and connected to the load 5.

In the watt-hour meter 1, an input terminal 4 and an output terminal 7 are internally connected by conductors 8a and 8b. The voltage detector 9 detects a voltage value applied to the load 5 by detecting a voltage value between the conductors 8a and 8b. The voltage detector 9 outputs the detected voltage value to the power calculator 11.

The current detector 10 detects the value of the current flowing through either the conductor 8a or the conductor 8b,
A current value supplied to the load 5 is detected. The voltage detector 10 outputs the detected current value to the power calculator 11.

The power calculator 11 multiplies the voltage value input from the voltage detector 9 by the current value input from the current detector 10 to determine the amount of power, and sends the obtained amount of power to the central processing unit 12. Output.

The central processing unit 12 calculates the accumulated value of the electric energy input from the electric power calculating unit 11 and outputs the obtained accumulated value to the display unit 13 as the electric energy used by the load 5 in a general household.

[0008] The display unit 13 displays the power consumption input from the central processing unit 12. Next, the conventional watt-hour meter 1
Will be described. When power is supplied to a general household, power is supplied from the power supply facility 2 to the load 5 via the distribution lines 3a and 3b, the watt hour meter 1, and the distribution lines 6a and 6b.

That is, inside the watt-hour meter 1, the input terminal 4 and the output terminal 7 of the watt-hour meter 1
a, 8b, the distribution lines 3a, 3b
b and the distribution lines 6a and 6b are electrically connected, and power is supplied from the power supply facility 2 to the load 5.

Inside the watt-hour meter 1, conductors 8a and 8
The voltage value applied to the load 5 is detected by the voltage detection unit 9 connected to the terminal b, and the current value supplied to the load 5 is detected by the current detection unit 10 connected to one of the conductors 8a and 8b. Is done.

The detected voltage value and current value are multiplied by a power calculation unit 11 to obtain a power amount. The accumulated amount of the obtained power amount is obtained by a central processing unit 12, and the power consumption of the load 5 is calculated. The amount is displayed on the display unit 13.

[0012]

In such a conventional watt-hour meter, the total power consumption, which is the cumulative amount, is displayed on the display unit so that it can be grasped. Cannot be grasped.

In a power demanding facility such as a general home, if the contract current is exceeded, the power supply is cut off by a breaker. Therefore, the contract current is increased, and the power supply side is provided with a facility to supplement the power supply during peak use. However, there is a problem that it is uneconomical.

The present invention has been made in view of the above,
It is an object of the present invention to provide a watt hour meter with a load control function capable of efficiently and economically supplying power by controlling connection / disconnection of a load in accordance with the state of use of power.

[0015]

To achieve the above object, according to the first aspect of the present invention, there is provided a first output terminal for supplying power from a power supply facility to a load, and a first output terminal for supplying power from the power supply facility. A second output terminal for supplying, via a switching device, a load different from the load, a power detection device for detecting an amount of power consumed in the load and another load, and a power detection device. Control means for comparing the power amount and the reference control value at regular intervals, opening and closing the switching means when the power amount exceeds the reference control value, and closing the opening and closing means when the power amount falls below the reference control value. It is a watt-hour meter provided with.

In the watt hour meter according to the first aspect of the present invention, the amount of power consumed by the load and another load is detected by the power detecting means, and the control means is detected by the power detecting means at regular intervals. The power amount is compared with the reference control value, and when the power amount exceeds the reference control value, the opening / closing means is opened to stop supplying power to another load connected to the second output terminal. Further, even after the power supply to another load is stopped, the control unit compares the power amount detected by the power amount detection unit with the reference control value at regular intervals, and if the power amount becomes equal to or less than the reference control value. In this case, the opening / closing means is closed, and power supply to another load connected to the second output terminal is restarted.

As described above, by controlling the power supply to this load and another load based on the amount of power consumed by the load and another load, the peak power amount can be suppressed and consumed. Electricity can be leveled.

Therefore, it is possible to increase the efficiency of power supply,
It is possible to prevent an increase in equipment for supplementing the power supply during peak use, thereby achieving economical efficiency. Next, the invention of claim 2 is:
2. The watt hour meter according to claim 1, wherein the reference control value is switched high when the opening / closing means is in a closed state and low when the opening / closing means is in an open state, and is high when the opening / closing means is in a closed state. This is a watt hour meter that opens and closes the opening / closing means when the value exceeds a value, and closes the opening / closing means when the power amount falls below a low reference control value when the opening and closing means is in the open state.

In the watt hour meter according to the second aspect of the invention, the same effect can be obtained by the same operation as that of the watt hour meter according to the first aspect of the invention. Further, the reference control value when the opening / closing means is open is smaller than the reference control value when the opening / closing means is closed. That is, by providing a hysteresis characteristic to the opening / closing operation due to a change in the electric energy of the opening / closing means, once the opening / closing means is opened, the open state can be easily maintained, and the peak electric energy can be further suppressed. In addition, power consumption can be leveled.

Next, a third aspect of the present invention is a watt hour meter according to the first or second aspect, further comprising reference control value designating means for designating a reference control value used in the control means. is there.

Therefore, in the watt hour meter according to the third aspect of the invention, the reference control value can be freely designated by the reference control value designation means in addition to the same operation and effect as in the first or second aspect. Therefore, even when the state or environment of the load or another load changes, or when the load or another load changes, the peak power amount can be appropriately suppressed, and the power consumption can be leveled. Can be planned.

According to a fourth aspect of the present invention, in the watt-hour meter according to any one of the first to third aspects, the cycle designating means for designating a fixed period of time for the control means to perform the comparison is provided. It is an added watt hour meter.

In the electric energy according to the fourth aspect of the present invention,
The same effect can be obtained by the same operation as the watt hour meter according to the first to third aspects of the present invention. Further, since the cycle for performing the comparison can be freely designated by the cycle designating means, for example, when the change in the electric energy of the load and another load is small, the cycle is lengthened, and the electric energy of the load and another load is reduced. When the change is large, the cycle can be shortened, and the number of times of execution of the comparison process can be set appropriately.

According to a fifth aspect of the present invention, there is provided a watt-hour meter according to any one of the first to fourth aspects, further comprising an open / close state display means for displaying the open / close state of the open / close means. It is total.

Therefore, in the watt hour meter according to the fifth aspect of the present invention, in addition to the same functions and effects as those of the first to fourth aspects, the power user checks the open / close state of the open / close means by the open / close state display means. When it is confirmed that the opening / closing means is open as a result of the confirmation, the power consumed by the load is suppressed, so that the power supply to another load can be restarted at an early stage. The amount of power can be leveled, and power can be stably supplied to a load and another load.

Finally, according to the invention of claim 6, in the watt-hour meter according to any one of claims 1 to 5, when the open / close means is in the open state while the open / close means is closed. A margin display means for displaying at least one of the amount of power indicating the amount of extra power, the current value flowing from the power supply facility to the load and another load, and the load amount of the load and another load is added. It is an electricity meter.

Therefore, in the watt hour meter according to the sixth aspect of the present invention, in addition to the same operation and effect as the watt hour meter according to the first to fifth aspects of the present invention, until the opening / closing means is opened by the margin display means. The power user checks the margin of the load, and if it is determined that the release means is in a state where it is likely to be released, the power consumed by the load and another load is reduced, so that the load to another load can be reduced. The stop of power supply can be prevented, power can be stably supplied to the load and another load, and the amount of consumed power can be leveled.

[0028]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a watt hour meter with a load control function as a watt hour meter according to an embodiment of the present invention. The same parts as those in FIG. The description will be omitted, and only different parts will be described in detail.

This watt-hour meter with load control function 1
4 is connected to a load 15 in a general home by an output terminal 16 via distribution lines 6a and 6b, and is used for load control via a load 17 in a general home different from the load 15 and distribution lines 18a and 18b. It is connected by an output terminal 19. Here, the distribution lines 18a, 18b are the distribution lines 6a,
6b, the load 17
Is connected to

Further, inside the watt hour meter 14 having the load control function, the output terminal 16 and the switch 20 are connected.
Are connected by conductors 21a and 21b, and the switch 20 and the load control output terminal 19 are
2a and 22b.

The switch 20 includes conductors 21a and 21b and conductors 22a and 22b based on a command from the central processing unit 23.
Connection / disconnection with the
It is determined whether or not power is supplied to the load 17.

The central processing unit 23 accumulates the electric energy input from the electric power arithmetic unit 11 to obtain the used electric energy, and outputs the obtained electric power to the display unit 24. In addition, the central processing unit 23 compares the power amount input from the power calculation unit 11 with an arbitrary reference control value at every arbitrarily set constant period, and this power amount exceeds the reference control value. In such a case, a disconnection command is output to the switch 20, and conversely, if the power amount falls below the reference control value, a connection command is output to the switch 20.

Here, the reference control value may be switched depending on whether the load 17 is in the connected state or the disconnected state, that is, depending on the open / closed state of the switch 20. in this case,
The reference control value when the opening / closing means is open is set smaller than the reference control value when the opening / closing means is closed.

The reference control value is stored in the central processing unit 23.
Can be freely designated by a reference control value designation unit (not shown) connected to the. The central processing unit 2
3 is connected to a cycle designating means (not shown) for freely designating a fixed cycle time for comparing the amount of power input from the power calculator 11 with the reference control value.

In addition, the central processing unit 23 includes the switch 2
The amount of power indicating how much margin is left before 0 becomes an open state, from the power supply facility 2 to the load 15 and another load 17.
, And the load amount of the load 15 and another load 17 are obtained and output to the display unit 24.

The display section 24 displays the amount of electric power used from the central processing section 23, the open / close state of the switch 20, and the central processing section 23.
, The reference control value, and the switch 20
Of electric power indicating how much margin is left before the power supply is opened, a current value flowing from the power supply facility 2 to the load 15 and another load 17, a load amount of the load 15 and another load 17, and the like are displayed. .

Next, the operation of the watt hour meter 14 having the load control function having such a configuration will be described. Watt hour meter with load control function from power supply equipment 2
The power input to the input terminal 4 is input to the output terminal 16 via the conductors 8a and 8b.

The power input to the output terminal 16 is supplied to the load 15 via the distribution lines 6a and 6b extending indoors.
, Power is supplied to the load 15 unless the power supply facility 2 is stopped. Therefore, as the load 15, an electric device or the like which must always operate, such as a refrigerator, is suitable.

When the switch 20 is in a closed state, the power input to the output terminal 16 is applied to the conductors 21a and 21a.
The power input to the load control output terminal 19 via the switch 21b, the switch 20, and the conductors 22a and 22b, and the power input to the load control output terminal 19 is transmitted through the distribution lines 18a and 18b stretched indoors. The load 17 is supplied to the load 17.

On the other hand, when the switch 20 is open, the supply of power to the load 17 is stopped. Inside the watt hour meter 14 with a load control function according to the present embodiment, the voltage component is detected as an electric signal by the voltage detection unit 9 to determine the amount of power used by the load 15 and the load 17, and the current detection unit A current component is detected as a current signal by 10, a power amount is obtained by a power calculating unit 11 that multiplies the voltage value and the current value, and a central calculating unit 23 obtains a used power amount by accumulating the obtained power amount. The obtained power consumption is displayed on the display unit 24.

Here, the central processing unit 23 compares the power consumed by the load 15 and the load 17 with the reference control value at regular intervals, and when the power consumption exceeds the reference control value. Indicates that the switch 20 is opened and the load 1
The power supply to 7 is stopped.

Then, the reference control value handled by the central processing unit 23 is switched to a smaller value. Subsequently, in the central processing unit 23, the amount of power consumed by the load 15 and the reference control value switched to a small value are compared at regular intervals, and this power consumption becomes equal to or less than the reference control value. In this case, the switch 20 is closed, and the power supply to the load 17 is restarted.

Then, the reference control value handled by the central processing unit 23 is switched to the original value. Hereinafter, effects of the watt hour meter 14 with a load control function according to the present embodiment will be described.

This watt hour meter 1 with a load control function
In 4, when the amount of power consumed by the load 15 and another load 17 exceeds the reference control value or becomes equal to or less than the reference control value, the operation of supplying power to the load 15 and another load 17 is performed. Therefore, the peak power amount can be suppressed, and the power amount consumed can be leveled.

Therefore, it is possible to increase the efficiency of power supply,
It is possible to prevent an increase in equipment for supplementing the power supply during peak use, thereby achieving economical efficiency. In addition, by making the reference control value in the state where the switch 20 is open smaller than the reference control value in the state where the switch 20 is closed, when the switch 20 is once opened, the open state is easily maintained. Therefore, the peak power amount can be further suppressed.

Further, since the reference control value can be freely designated by a reference control value designation section (not shown), the state or environment of the load 15 or another load 17 changes, or the load 15 or another load 17 Even when it is changed, the peak power amount can be appropriately suppressed.

Further, since the cycle for comparison can be freely designated by a cycle designating section (not shown), for example, when the change in the electric energy of the load 15 and another load 17 is small, the cycle is lengthened and the load 15 is increased. And when the change in the electric energy of another load 17 is large, the cycle can be shortened,
The number of executions of the comparison process can be set appropriately.

Further, the power user can confirm the open / closed state of the switch 20 by the open / closed state of the switch 20 displayed on the display unit 24, and the result of this confirmation indicates that the switch 20 is open. In this case, the power user can suppress the power consumed by the load 15 so that the power supply to another load 17 can be restarted at an early stage, thereby leveling the power consumption. ,
In addition, power can be stably supplied to the load 15 and another load 17.

Further, the power user confirms the margin until the switch 20 is opened by the display unit 24, and as a result of the confirmation, when the power user determines that the opener 20 is in a state of being easily opened. By suppressing the power consumed by the load 15 and the other load 17, it is possible to prevent the power supply to the other load 17 from being stopped, and to stably supply the power to the load 15 and the different load 17. can do.

In the watt hour meter 14 with a load control function according to the present embodiment, the power calculation unit 11 and the central calculation unit 23 have different configurations, but these two configurations are combined into one. Is also good.

[0051]

As described above, according to the present invention, a load to be supplied with power is divided into a load and another load.
When the amount of power consumed by both loads exceeds the reference control value, the power supply to another load is stopped, and when the amount of power consumed by both loads falls below the reference control value, the power supply to another load is stopped. Has resumed.

Therefore, the peak power amount can be suppressed, and the consumed power amount can be leveled. Therefore, the efficiency of power supply can be improved, and an increase in equipment for supplementing power supply during peak use can be prevented, and economical efficiency can be achieved.

Further, once the power supply to another load is stopped, the power supply to both loads is resumed when the amount of power falls below a reference control value lower than the reference control value. Once the power supply to another load is stopped, the stopped state can be easily maintained, and the peak power amount can be further suppressed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a watt hour meter with a load control function as a watt hour meter according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional watt hour meter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Watt hour meter 2 ... Power supply equipment 3a, 3b, 6a, 6b, 18a, 18b ... Distribution line 4 ... Input terminal 5, 15, 17 ... Load 7, 16 ... Output terminal 8a, 8b, 21a, 21b, 22a , 22b ... conductor 9 ... voltage detection unit 10 ... current detection unit 11 ... power calculation unit 12, 23 ... central calculation unit 13, 24 ... display unit 14 ... watt hour meter with load control function 19 ... load control output terminal 20 ... Switch

Claims (6)

[Claims] A first output terminal for supplying power from a power supply facility to a load; and a first output terminal for supplying power from the power supply facility to a load different from the load via switching means. A second output terminal, power detection means for detecting the amount of power consumed by the load and the another load, and comparing the power amount detected by the power detection means with a reference control value at regular intervals. Control means for opening the switching means when the power amount exceeds the reference control value, and closing the switching means when the power amount falls below the reference control value. Meter. 2. The watt hour meter according to claim 1, wherein the reference control value is switched high when the opening / closing means is in a closed state and low when the opening / closing means is in an open state. When the electric energy exceeds a high reference control value, the opening / closing means is opened, and when the electric energy falls below a low reference control value when the opening / closing means is in an open state, the opening / closing means is closed. Watt hour meter. 3. The watt hour meter according to claim 1, further comprising a reference control value designating unit for designating a reference control value used in said control unit. 4. The watt hour meter according to claim 1, wherein a cycle designating means for designating a time of a fixed cycle in which the control means makes a comparison is added. Watt hour meter. 5. The watt hour meter according to claim 1, further comprising an open / close state display means for displaying an open / close state of said open / close means. 6. The watt hour meter according to claim 1, wherein in the state where the opening / closing means is closed, how much time is left before the opening / closing means is opened. Margin display means for displaying at least one of a power amount indicating the load, a current value flowing into the load and the another load from the power supply facility, and a load amount of the load and the another load. A watt hour meter.