JP2726781B2 - Load control device - Google Patents

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 for controlling a load connected to a power system.

[0002]

2. Description of the Related Art FIG. 9 is a block diagram of a conventional load control device connected to a power system. In the figure, reference numeral 1 denotes a power line connected to a power system, and 2 denotes a transaction transformer connected to a power line 1. (Including the watt-hour meter) 3 is a main switch for service provided on the output side of the transaction transformer 2, 4 is a main line, and 5, 6, and 7 are provided on power supply lines of loads 8, 9, and 10, respectively. It is a switch.
Reference numeral 30 denotes a master station device that outputs control signals for the switches 5, 6, and 7. The master station device 30 is connected to a terminal device 2 via a transmission device 31, a signal transmission path (communication line) 32, and a transmission device 25.
4 is connected. 21, 22, and 23 are terminal devices 24.
Are control lines for supplying control signals to switches 5, 6, and 7, respectively.

Next, the operation will be described.

[0004] It is a well-known fact that load control is required from the power supply and demand situation, and power supply and demand situation monitoring is performed at power plants and substations. If the load control is determined to be necessary based on the result of monitoring the supply and demand condition, the master station device 30 installed in the control center or business office of the power company loads the loads 8, 9 of the customer.
Alternatively, a control signal of the switch 5, 6, or 7 is transmitted to the terminal device 24 through the transmission device 31, the signal transmission line 32, and the transmission device 25 in order to control the switch 10. The terminal device 24 determines which load is to be controlled based on the transmitted control signal, and selects the switch 5, 6, or 7 for the target load, and the switch 5, 6, or 7, which controls the switch, controls the switching. If controlled, the status of the auxiliary contacts attached to the respective switches 5, 6 or 7 is transmitted to the master station device 30 via the terminal device 24, and the fact that the target load has been controlled is notified to the master station device 30. It is something to grasp.

[0005]

Since the conventional load control device is constructed as described above, the master station device 30 can monitor and control the opening and closing of the switches 5, 6, 7;
Reference numeral 10 denotes a switch provided on a trunk line different from the trunk line 4 and can be arbitrarily controlled by a customer's will. Therefore, there is a problem that actual load control cannot be performed in the master station device 30. Was. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has been made to monitor a change in an electric quantity (or a current change amount or a power change amount) due to a load change and to perform load control. It is an object of the present invention to provide a load control device capable of directly checking the load on the master station device.

[0006]

According to a first aspect of the present invention, there is provided a load control device comprising: a switch provided on a power supply line of a load to be controlled; a terminal device for selectively controlling the switch to open and close;
A master station device connected to the terminal device via transmission means, a current transformer for detecting a change in current based on the ON / OFF state of the switch, and a change in current in response to a detection signal from the current transformer. And a current change detecting device for detecting the current change.

According to a second aspect of the present invention, there is provided a load control device including a switch provided on a power supply line of a load to be controlled, a terminal device for selectively opening and closing the switch, and transmission means for the terminal device. A base station device connected thereto, a current transformer for detecting a change in current based on the on / off state of the switch, a transformer for detecting a change in voltage, and detection signals of the current transformer and the transformer And an electric power change detecting device for detecting an increase or decrease in electric power in response to the electric power.

According to a third aspect of the present invention, there is provided a load control device comprising: a switch provided on a power supply line of a load to be controlled; a terminal device for selectively opening and closing the switch; and a transmission means for the terminal device. A master station device connected thereto via a power supply, a current transformer for detecting a change in current based on the on / off state of the switch, and a current value measuring device for detecting a current change amount by receiving a detection signal of the current transformer. And is provided.

According to a fourth aspect of the present invention, there is provided a load control device including a switch provided on a power supply line of a load to be controlled, a terminal device for selectively opening and closing the switch, and transmission means for the terminal device. A base station device connected thereto, a current transformer for detecting a change in current based on the on / off state of the switch, a transformer for detecting a change in voltage, and detection signals of the current transformer and the transformer And a power value measuring device for detecting the amount of power change in response to the power change.

[0010]

The load control device according to the first aspect of the present invention uses the current information transmitted from the current change detecting device on the terminal device side, and the load control device according to the second aspect of the invention controls the power change on the terminal device side. The power information transmitted from the minute detection device is compared with the current information or power information for each customer, which is held in advance by the master station device, and the load control state is confirmed. Load control can be surely known.

According to a third aspect of the present invention, there is provided a load control device comprising:
The load control device according to claim 4, wherein the current change amount transmitted from the terminal device side current value measuring device and the power change amount transmitted from the terminal device side power value measuring device are used as the master station device. Directly on the side's current or power monitoring screen.
By reading and confirming the load control state, reliable load control can be performed with high accuracy.

[0012]

Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings.

In FIG. 1 in which the same reference numerals are given to the same parts as those of the conventional apparatus shown in FIG. The current change detecting device 27 detects a current change in the main line 4. The current change detecting device 27 transmits current information to the master station device 30 via the transmission device 25, the signal transmission line 32, and the transmission device 31. It is configured as follows.

Next, the operation will be described. In FIG. 1, when a control signal for controlling the switching of the load 8 by the switch 5 is output from the master station device 30, the control signal is transmitted to the transmission device 3.
1. The terminal device 24 supplied via the signal transmission line 32 and the transmission device 25 performs the switching operation of the switch 5, and the auxiliary contact (not shown) of the terminal device 24 is turned off. Know the off state. In addition, the current flowing through the trunk line 4 decreases due to the switching operation of the switch 5, and this current decrease is detected by the current change detecting device 27 via the current transformer 26. In this case, the sign of “−1” (the sign of “+1” in the case of an increase in current) is used as the state signal of the switch 5 (“1” in the case of ON, and “0” in the case of OFF) when the current decreases. With the signal transmission path 3
2. Transmission to the master station device 30 via the transmission device 31.

The master station device 30 stores the transmitted current information in a database (customer name, switch NO, load name, load capacity) which is stored in advance and is current information for each customer as shown in FIG. , Etc.) to know that the load 8 is controlled by the control of the switch 5, and indirectly know the load control state.

That is, in FIG. 1, the loads 8, 9 and 1
0, the database of the customers of the master station device 30 is shown in FIG.
Load NO. When the disconnection control of the load 8 is performed by the disconnection control of the switch 5 in FIG. As shown in FIG.
(A) decreases to 0 (A). This state change is detected by the current change detecting device 27 in FIG. In the present embodiment, since the current change is a case of a decrease, “−1” is transmitted to the master station device 30. In this case, the load NO. I of 1
1 is calculated to be "0", the change information resulting from the load control is grasped point by point, and the control result can be confirmed. Load control can be performed.

Second Embodiment FIG. 3 is a block diagram showing a second embodiment in which the same parts as those of the first embodiment shown in FIG. In FIG. 3, reference numeral 28 denotes a transformer, and 29 denotes a power change detecting device that inputs a current value change from the current transformer 26 and a voltage value change from the transformer 28, respectively.

In FIG. 3, loads 8, 9 or 10 are:
Like the first embodiment, the power is controlled by the switches 5, 6 or 7, but the increase or decrease of the power due to the result of the load control is detected by the power change detecting device 29. In this case, -1 is transmitted to the master station device 30.

The master station device 30 has a database as power information for each customer in advance as shown in FIG. 4, and compares the database with transmitted power information to obtain a load control result. It is possible to confirm, and the same result as in the first embodiment is obtained. Third Embodiment FIG. 5 is a block diagram showing a third embodiment in which the same parts as those in the first embodiment shown in FIG. In FIG. 5, reference numeral 33 denotes a current value measuring device which, when the loads 8, 9 and 10 are controlled, measures a current corresponding to the load amount as it is. 25, signal transmission path 32,
It is transmitted to the master station device 30 via the transmission device 31.

The master station device 30 is provided with a current monitoring screen as shown in FIG. 6, and the screen is updated with the current change amount information collected from the customer side, so that the load control status can be read directly. ing.

In the current monitoring screen shown in FIG.
At time t1, loads 8, 9 and 10 (load names L1, L2 and L3 on the database) in FIG.
) Are in the ON state, and the load current is I1
, I2 and I3, but when the load 8 (load name L1) is controlled to be turned off at time t1, the load current becomes I1
+ I2 + I3 changes to I2 + I3. The change in the current value can be directly grasped by the master station device 30. As a result, the control result can be correctly confirmed, and an effect equal to or greater than that of the above-described embodiment can be obtained.

Fourth Embodiment FIG. 7 is a block diagram showing a fourth embodiment in which the same components as those in the first embodiment shown in FIG. In FIG. 7, reference numeral 34 denotes a power value measuring device for inputting a current value from the current transformer 26 and a voltage value from the transformer 28. When the loads 8, 9 and 10 are controlled, a power value corresponding thereto is measured. Then, the measured power value is transmitted to the transmission device 2
5, master station device 3 via signal transmission path 32 and transmission device 31
Send to 0.

A power monitoring screen as shown in FIG. 8 is prepared in the master station device 30. The screen is updated with the power change amount information collected from the customer, and the load control status can be directly read as a power value. It has become.

On the power monitoring screen shown in FIG.
From 0 to t1, the loads 8, 9 and 10 in FIG. 7 are all in the on state, and the power value of the load is P1 +
Although it was P2 + P3, when the load 8 (power value P1) is turned off at time t1, the load power value changes to P2 + P3. This change in the power value can be directly monitored by the master station device 30. As a result, the numerical value (power value) can be grasped with the same single value as the load control amount (power value) required from the entire power system, and the effect equal to or more than that of the above embodiment can be obtained.

[0025]

As described above, claim 1 or claim 2 is provided.
According to the invention, hitting to do load control, the control target in addition to the monitoring of the on-off state of the provided the switch to a load, the pre changes in current or power generated as a control result by the master station apparatus side
Since it is configured to check the load control state by comparing it with the current information or power information for each customer
Load control is assured.

According to the third or fourth aspect of the present invention, in addition to monitoring the on / off state of the switch provided in the load to be controlled, the amount of current change or the amount of power change resulting from the control is controlled. Since the monitoring is performed on the current or power monitoring screen on the station device side, there is an effect that a reliable and accurate load control device can be obtained.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram of a database provided in a master station device according to the first embodiment and data correspondence of control results.

FIG. 3 is a block diagram showing a second embodiment of the load control device according to the present invention.

FIG. 4 is an explanatory diagram of a database provided in a master station device according to a second embodiment and data correspondence of control results.

FIG. 5 is a block diagram showing a third embodiment of the load control device according to the present invention.

FIG. 6 is a diagram illustrating a current monitoring screen in a master station device according to a third embodiment.

FIG. 7 is a block diagram showing a fourth embodiment of the load control device according to the present invention.

FIG. 8 is a diagram of a power monitoring screen in a master station device according to a fourth embodiment.

FIG. 9 is a block diagram showing a conventional load control device.

[Explanation of symbols]

 5-7 switch 8-10 load 24 terminal device 25 transmission device (transmission means) 26 current transformer 27 current change detection device 28 transformer 29 power change detection device 30 master station device 31 transmission device (transmission means) 32 Signal transmission path (transmission means) 33 Current value measuring device 34 Power value measuring device

Claims (4)

(57) [Claims] 1. A switch provided on a power supply line of a load to be controlled, a terminal device for selectively opening and closing the switch,
A master station device connected to the terminal device via transmission means, a current transformer for detecting a change in current based on the ON / OFF state of the switch, and a change in current in response to a detection signal from the current transformer. And a current change detecting device for detecting the current information from the current change detecting device supplied via the transmission means, and comparing the current information with the current information for each customer who has previously stored the current information. A load control device characterized in that a load control state is confirmed on a device side. 2. A switch provided on a power supply path of a load to be controlled, and a terminal device for selectively opening and closing the switch.
A master station device connected to the terminal device via transmission means, a current transformer for detecting a change in current based on an on / off state of the switch, a transformer for detecting a change in voltage, and the current transformer And a power change detecting device for detecting an increase or decrease in power in response to a detection signal of the transformer, and has in advance power information from the power change detecting device supplied via the transmission means. A load control device characterized in that a load control state is confirmed on the master station device side by comparing with power information for each customer. 3. A switch provided on a power supply path of a load to be controlled, a terminal device for selectively controlling opening and closing of the switch,
A master station device connected to the terminal device via transmission means; a current transformer for detecting a change in current based on the on / off state of the switch; and a current change amount upon receiving a detection signal of the current transformer. and a current value measuring device for detecting, a straight read to load control state current change amount information with a current monitoring screen of the master station apparatus side from the current value measuring device which is supplied through the transmission means A load control device characterized by checking. 4. A switch provided on a power supply path of a load to be controlled, a terminal device for selectively controlling the switch to open and close,
A master station device connected to the terminal device via transmission means, a current transformer for detecting a change in current based on an on / off state of the switch, a transformer for detecting a change in voltage, and the current transformer And a power value measuring device for detecting a power change amount in response to the detection signal of the transformer, and the power change amount information from the power value measurement and detection device supplied via the transmission means is transmitted to the master station device. load control apparatus characterized by confirming a straight read to load control state of the side power monitoring screen.