JPH0652971B2 - Demand control device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a demand control device for monitoring and controlling the amount of electric power used in a demand time period such as 30 minutes so as not to exceed a contracted electric power amount. Is.

[Conventional technology]

FIG. 1 is a block diagram showing a conventional demand control device disclosed in, for example, Japanese Patent Laid-Open No. 55-43950.
In FIG. 1, a load (1) is a contract for the amount of power used in a demand time period such as 30 minutes, and is composed of a plurality of loads (1a) to (1n). The watt hour meter (2) with a transmitter is the applied voltage of the load (1) detected by the voltage transformer (3) and the load current of the load (1) detected by the current transformer (4). According to, the power consumption of the load (1) is measured,
The measured value is transmitted to the demand control device (5) by a pulse signal. The demand control device (5) is composed of the following devices. Input control section
(6) receives and counts a pulse signal proportional to the amount of electric power used in the load (1) from the electric energy meter with a transmitter (2). The time limit unit (7) measures the demand time limit, outputs a demand signal every 30 minutes, for example, and outputs a calculation signal at constant time intervals. The display setting unit (8) sets and displays the target demand value, the loads (1a) to (1n) and the power cutoff value. The calculation processing unit (9) performs a prediction calculation of the demand value at the end of the demand time period from the count value of the input control unit (6) and the remaining time of the time limit unit (7), and the prediction calculation value and the display setting unit (8 ), And the adjusted power is calculated based on the predicted calculation value. When the predicted calculation value exceeds the target demand value, the output control unit (10) applies an alarm output from the calculation processing unit (9) to an alarm relay unit (11) described later, and the adjusted power is set for display. When the power or disconnection power value set in the unit (8) is exceeded, the power or disconnection output from the arithmetic processing unit (9) is applied to the control relay unit (12) described later. Alarm relay section (1
1) is an alarm device (13) in response to an input signal from the output control unit (10).
It produces an output that activates a) to (13k). The control relay section (12) is loaded by the input signal from the output control section (10).
It produces an output that turns off (1a) to (1n).

Next, the operation will be described. The power meter with a transmitter (2) transmits a pulse signal proportional to the amount of power used in the load (1). The input control unit (6) receives and counts this pulse signal. The time limit unit (7) measures the demand time limit, generates a demand time limit signal of, for example, 30 minutes, and outputs a calculation signal that determines a calculation interval for every fixed time. The arithmetic processing unit (9) is a count value and time limit unit of the input control unit (6).
The predicted value of the demand value at the end of the demand time period is calculated from the remaining time limit of (7), and this value is displayed in the display setting section.
It is judged whether the target demand value set in (8) is exceeded, and if it exceeds, the alarm device (13a) is activated, for example.
The alarm signal of is generated. Also, the adjusted power is calculated based on this value, and when this value exceeds the value set in the display setting section (8) or the power cutoff value, for example, a second alarm signal for activating the alarm device (13b) is issued. Along with the generation, for example, a load / disconnect signal for generating or disconnecting the load (1a) is generated. These signals are input to the output control unit (10), and the alarm signal drives the corresponding relay unit of the alarm relay unit (11) to activate the corresponding alarm devices (13a) to (13k). Further, the load or disconnection signal drives the corresponding relay of the control relay unit (12) to disconnect or disconnect the corresponding loads (1a) to (1n).

[Problems to be Solved by the Invention] Since the conventional demand control device is configured as described above, when the loads (1a) to (1n) to be controlled to be turned off and on are scattered in the distance, If the places to notify the demand alarm are scattered and the alarm devices (13a) to (13k) are scattered, the load control power lines must be individually stretched from this device, especially when the distribution line distance is long. The construction cost was enormous compared with the demand control device. In addition, the number of loads (1a) to (1n) to be disconnected is low, or there are customers who do not need load control,
For consumers who do not need a demand warning output, since the functions that are not required are added, it is more expensive than the required functions.Therefore, there is a demand for cutting down unused functions to make them cheaper. It was

The present invention solves the problems of the conventional ones as described above,
It is an object of the present invention to provide a demand control device which has a low construction cost and can install a device according to a function requested by a consumer.

[Means for Solving Problems] A command control device according to the present invention comprises:
The alarm unit and the control unit are separated from each other, and means for detecting the disconnection of the signal line is added depending on the state of the signal.

[Operation] The present invention includes a master unit, an alarm unit, and a control unit,
By separating and independence, each device is attached to a desired place, and disconnection of the signal line is detected by the signal state.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing an embodiment of the demand control device according to the present invention. In FIG. 2, the main unit (10
The unit 0) is the center of this device and is composed of the following devices. The input control unit (101) receives and counts a pulse signal proportional to the amount of electric power used in the load (1) from the electric energy meter with a transmission device (2). The time limit unit (102) measures the demand time limit, outputs a demand signal every 30 minutes, for example, and outputs a calculation signal at constant time intervals. The setting unit (103) is the target demand value and load (1a)
It sets the value of (~ 1n) and the power-off value. The calculation processing unit (104) performs a prediction calculation of the demand value at the end of the demand time period from the count value of the input control unit (101) and the remaining time of the time limit unit (102), and the predicted calculation value and the setting unit (103) The target power value is set to the target demand value, and the adjusted power is calculated based on the predicted calculation value. When the predicted calculation value exceeds the target demand value, the signal transmission section (105) outputs an alarm output signal from the calculation processing section (104) as an output terminal.
(106) via the alarm unit (200) to be described later converted into a predetermined transmission signal and transmitted, and the adjusted power is the setting unit (103)
If the power or power cutoff value set in is exceeded, calculation processing (104)
The output signal is converted into a predetermined transmission signal and transmitted to the control unit (300) described later through the output terminal (106). The storage unit (110) stores the target demand value set in the setting unit (103). Carrier detector
If the signal on the signal line (131) described later is not kept for a certain period of time, the signal line (131) is detected as a disconnection or an abnormality of the signal line (131) and is transmitted to the arithmetic processing unit (104) to display the signal. A disconnection or an abnormal display is made at (107).

The alarm unit (200) is composed of the following devices. The input terminal (201) is connected to the output terminal (106) of the parent device (100) via a signal line (131) which is, for example, a two-core twisted pair cable. The signal transmission unit (202) receives and demodulates the alarm output signal from the signal transmission unit (105) of the parent device (100). Address setting unit (203) is alarm unit (200)
The address corresponding to, that is, the address corresponding to the arithmetic processing unit (204) is set. The arithmetic processing unit (204) reads the signal demodulated by the signal transmission unit (202), and also reads the address address of its own set in the address setting unit (203), and the transmitted signal is its own. Whether the address is given to the address is judged, and if the address is related to itself, a signal according to the content is output. The output control unit (205) activates the alarm relay unit (206) according to the content of the output signal of the arithmetic processing unit (204), and outputs the alarm device (13a).
It produces an output that energizes ~ (13k). The alarm devices (13a) to (13k) are installed in a safety room for electric management and an electric management chief room in the office. Carrier detector (2
07), if the signal on the signal line (131) is not connected for a certain period,
Detected as disconnection or abnormality of the signal line (131),
This is transmitted to the arithmetic processing unit (204) and causes the display unit (208) to display a disconnection or an abnormal display.

The control unit (300) is composed of the following devices. The input terminal (301) is the input terminal (20
For example, the signal line (1) which is a 2-core twisted pair cable
32). The signal transmission unit (302) is the main unit (1
It receives and demodulates the output signal from the signal transmission unit (105) of (00). The address setting unit (303) is set with an address corresponding to the control unit (300), that is, an address corresponding to the arithmetic processing unit (304). Arithmetic processing unit
(304) read the signal demodulated by the signal transmission unit (302), and read in the address address of its own set in the address setting unit (303), the transmitted signal to its own address It determines whether or not it is given by the user, and outputs a signal according to the content if it is related to oneself. The output control unit (305) energizes the control relay unit (306) according to the content of the output of the arithmetic processing unit (304), and loads (1a) to
It produces an output that turns on or off (1n). When the signal on the signal line (132) is not kept for a certain period, the carrier detection unit (307) detects that the signal line (131) is broken or abnormal, and transmits it to the arithmetic processing unit (304) for display. The part (308) is for causing a disconnection or an abnormal display.

Next, the operation will be described. The input control section (10
1) receives and counts the transmission pulse of the watt hour meter (2) with a transmission device. The time limit unit (102) creates and outputs a demand time limit of, for example, every 30 minutes, and also outputs a calculation signal for determining a calculation interval for every fixed time. The arithmetic processing unit (104) calculates the predicted value of the demand value at the end of the demand time period from the count value of the input control unit (101) and the remaining time period of the time period unit (102), and this value is set by the setting unit (103 It is determined whether or not the target demand value set in () is exceeded, and if the target demand value is exceeded, a first alarm signal for activating the alarm device (13a) is generated. Also, the adjusted power is calculated based on the predicted value, and when this value exceeds the value set in the setting unit (103) or the power cutoff value when the first alarm is generated, the alarm device (13b) is activated. The alarm signal 2 is generated, and the load (1a) is turned on or off.

The calculation result, alarm signal, load signal and disconnection signal are displayed on the display unit (107). Further, these data are passed to the signal transmission unit (105), converted into a predetermined transmission signal by the signal transmission unit (105), and output to the output terminal (106). This signal is sent via the signal line (131) to the alarm terminal (200) input terminal (20
It is input to 1) and received by the signal transmission unit (202). The signal transmission unit (202) demodulates the received signal, the arithmetic processing unit (204) reads this value, reads the own address address set in the address setting unit (203), and transmits the value. Determines whether the address is given to its own address, and if it is related to itself, it outputs a signal to the output control unit (205) according to the content, and the alarm relay unit (206) The corresponding alarm circuit (13a) to (13k) connected thereto is driven by driving the corresponding relay circuit of (3).

Next, the signal input to the input terminal (301) of the control unit (300) via the signal line (132) is processed in the same manner as the alarm unit (200), and the load ( 1a) to (1n)
The control relay unit (306) is caused to generate an output for turning on and off.

The carrier detectors (111), (207), (307) are connected to the signal line (13
It is detected that the transmission signal is always present on 1) and (132). Therefore, when the transmission signal is not applied for a certain period, it can be detected as a disconnection of the signal lines (131) and (132). Further, even if a transmission signal is transmitted from the master unit (100) for a certain number of times, the alarm unit (200) that does not return, the control unit (300), or the alarm unit (200) that does not return for a certain period of time, the control unit (300) Is detected as an abnormality.

The transmission is converted into a serial signal by the signal transmission units (105), (202) and (302), and is subjected to baseband or modulation so that it can be placed on the signal lines (131) and (132). it can. Therefore, for the signal lines (131) and (132), for example, a two-core twisted spare cable or the like can be used.

FIG. 3 is a configuration diagram of a signal transmitted between the signal transmission units (105), (202) and (302). This transmission is a method of sequentially polling from the master unit (100), so-called slave unit (hereinafter referred to as slave unit) such as the alarm unit (200) and the control unit (300).
To send and receive necessary commands and data.

First, the address word (601) is transmitted. This address word (601) is sent from the parent device (100) to which child device (200),
This is for identifying whether the transmission is to (300), and the slave unit (200) that matches the setting values of the address setting units (203) and (303) of the slave units (200) and (300). , (300) is the partner of the transmission.

Next, the control word (602) is transmitted. The control word (602) is a code of a command that indicates what operation is to be performed from the master unit (100) to the slave units (200) and (300) that are transmission partners. , And a data length designation mode can be determined.

That is, when the slave units (200) and (300) are to be controlled in some way, for example, a specific code is made to correspond to a certain control operation, and that code is received by the slave units (200) and (300). When this is done, the code is deciphered and the corresponding operation is performed. In addition, the data length designation mode is a slave unit.
When data communication is performed between (200) and (300), this is used to specify the data length to be transmitted, and to specify how many bytes a data word will be described later. For example, when this code is OOH, the data is 0 bytes, when this code is 01H, the data is 1 byte, when this code is 02H, the data is 2 bytes, and so on.
In this case, the data length is 8 bytes.

Next, the first Samchiek word (603) is sent,
This is the address word (601) and control word (602)
The value obtained by adding the code of is added to the first Samchieck word (6
03), which is for performing an error check that may occur during transmission. At the receiving side, the received code of the address word (601) and control word (602) is added, and that value and the first The values of the Samchiek word (603) are compared with each other, and when they match, it is determined that the normal transmission is performed.

Next, the data words (610) to (617) are transmitted. These data words (610) to (617) are data transmitted and received when data is transmitted between the master unit (100) and the slave units (200) and (300), and the control word (602) is the data word. Sent when the code corresponds to the long designation mode. That is, for example, when the control word (602) is 03H, the data word is
It consists of 3 bytes of (610), (611), and (612), and also 05H
, The data word is (610), (611), (612), (61
It consists of 5 bytes, 3) and (614).

A second thumb check word (618) is added to the end of the data words (610) to (617) and transmitted. This word is the address word (601), control word (602),
The first Samchiek word (603) and the data word (61
All the codes from 0) to (617) are added, and the addition result excluding overflows is added to the second thumb word (6
Send as 18). This word is also for checking the transmission error in the same manner as described above, and the operation on the receiving side is the same as that of the first thumb check word (603).

Figure 4 shows the address word (601) and control word (60
2), a time chart of the word structure of the first thumb check word (603). For example, the address word (601) has a start bit (601a) first, and then a signal bit (601b).
Are lined up, and a stop bit (601c) is added at the end.

FIG. 5 is a diagram for explaining the address word (601) in more detail. First, a start bit (601a) is present, and then a signal bit (601b) is transmitted in a 9-bit configuration. The last of these is the parity bit (601d) for the error check. And finally stop bit (601c)
Exists. This bit structure is used for not only the control word (602) and the first thumb check word (603),
The data words (610) to (617) and the second thumb check word (618) have the same configuration, and signal transmission is performed with the above configuration.

At this point, the transmission error check is
The Samchek words (603), (618), and the parity check for each word. That is, the base unit (10
From 0) to the corresponding slaves (200) and (300), see FIGS.
When a signal with the configuration shown in the figure is transmitted, the corresponding slave unit (20
0) and (300) receive this signal and determine whether or not the signal is given to themselves by decoding the address word (601). Further, the parity bit and the first and second thumb check words (603) and (618) are checked, and if an error is detected in this check, the operation is not performed and the signal transmission from the master unit (100) is waited for. Of course, if there is an error in the address word (601), an error may occur, such as sending a signal to the slaves (200), (300) having nonexistent addresses. in this case,
Since there are no corresponding slaves (200), (300),
After all, the slaves (200) and (300) do not operate. Base unit (10
(0) waits for a fixed time for a return signal of operation completion from the slaves (200), (300) and data transfer. During this time, if there is no return, the same signal as the previous time is applied again to the corresponding slave unit (200),
Send to (300). This retransmitted signal is used for the slave unit (200),
When (300) is correctly received, the result is returned to the master unit (100). If there is an error in the reception of the retransmitted signal as well, it cannot be returned to the base unit (100).
The master unit (100) considers that there is an abnormality in the slave units (200), (300),
The address numbers of the abnormal slave units (200) and (300) are stored in the storage unit (110). Further, it is displayed on the display unit (107) of the master unit (100) to notify the supervisor, and the polling operation is moved to the next address. Of course, in this case, when the signal lines (131) and (132) are broken, the carrier detection units (207) and (307) of the corresponding slave units (200) and (300) are detected.
Detected that there is no carrier, and the corresponding display
An error is displayed on (208) and (308) to alert the watcher.

In the above embodiment, for the convenience of explanation, the slave units (200) and (300) are described as the case where one alarm unit (200) and one control unit (300) are connected, but of course the required number of units is required. It is possible to connect only to each other, and these slave units (200) and (300) are placed in each of the distributed locations, and the master unit
Necessary signals and data can be transmitted and received from (100).

In addition, since the number of connected slave units (200) and (300) is various, the master unit (100) performs a polling operation, and the number of slave units (200) and (300) is not limited to any means. It is advantageous in terms of transmission processing capacity that there is no need to perform useless polling operation. To do this, set the number of slave units (200) and (300) connected to the master unit (100) with a switch, etc., or enter the number of connections with a keyboard etc. and store them in an internal memory circuit. It is also possible to provide a setting means and a storage means.

Without further setting, when the power is turned on as the system, as a beginning process, the main unit (100) side sequentially proceeds to the slave units (200),
Call (300) and answer the child device (200), (30)
It is judged that only 0) is connected, and the child device (200),
If the address of (300) is stored, the setting means can be omitted. Also, display units (208), (308)
Can be configured not only to display but also to output an alarm contact signal.

〔The invention's effect〕

As described above, according to the present invention, since the conventional demand control device is configured as an independent device such as a master unit, an alarm unit, and a control unit, a location to notify a load to be controlled or an alarm is at a long distance, Alternatively, if they are dispersed, the wiring work is simple and inexpensive. In addition, since the alarm unit and the control unit can be selected as necessary, it is possible to construct a configuration that meets the requirements, and it is possible to eliminate waste in terms of function and price. In addition, each unit can be placed and mounted where it is needed. Furthermore, by storing the number of the slave unit that does not respond and displaying it on the master unit side, or by providing a carrier detection unit on the master unit and the slave unit, there is no carrier for a certain period of time at the signal transmission terminals of each device. By detecting that and displaying this,
It has various effects such as the abnormality of the transmission device and the transmission line.

[Brief description of drawings]

FIG. 1 is a block diagram showing a conventional demand control device, FIG. 2 is a block diagram showing an embodiment of the demand control device according to the present invention, and FIG. 3 is transmitted by the signal transmission unit of FIG. FIG. 4 is a time chart of the configuration of each word in FIG. 3, and FIG. 5 is a time chart of the bit configuration of the address word in FIG. In the figure, (1), (1a) to (1n) are loads, (2) is a power meter with a transmitter, (100) is a master unit, (101) is an input control unit, (102) is a time limit unit, (103) is a setting unit, (104) is an arithmetic processing unit, (105) is a signal transmission unit, (106) is an output terminal, (107) is a display unit, (110)
Is a storage unit, (111) is a carrier detection unit, (200) is an alarm unit, (201) is an input terminal, (202) is a signal transmission unit, (203) is an address setting unit, (204) is an arithmetic processing unit, (205) is an output control unit, (206) is an alarm relay unit, (207) is a carrier detection unit, and (2)
08) is a display unit, (300) is a control unit, (301) is an input terminal, (302) is a signal transmission unit, (303) is an address setting unit, (30)
4) is an arithmetic processing unit, (305) is an output control unit, (306) is a control relay unit, (307) is a carrier detection unit, (308) is a display unit, (13a).
Up to (13k) are alarm devices, and (131) and (132) are signal lines. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. An input control unit for receiving and counting the number of pulses from a watt hour meter with a transmitting device, a time limit unit for measuring a demand time period and outputting a calculation signal at regular time intervals, and a target demand value and load load. And a power cutoff value are set, a demand value at the end of the demand time period is predicted from the count value of the input control unit and the remaining time of the time limit unit, and the predicted calculation value and the setting unit are set. And a calculation processing unit for calculating the adjusted power based on the predicted calculation value and a comparison calculation with the calculated target demand value, and a warning output signal from the calculation processing unit when the prediction calculation value exceeds the target demand value. When the adjusted power exceeds the setting power value or the disconnection power value set in the setting unit, the output signal from the arithmetic processing unit is converted into a predetermined transmission signal. And output to the output terminal And a carrier detection unit that detects if a transmission signal is not present on the signal line connected to the output terminal for a predetermined period of time as a disconnection or an abnormal state of the signal line, A signal transmission unit that is connected to an output terminal of the device via a signal line to receive and demodulate an alarm output signal from the signal transmission unit of the master device, and an address setting unit in which the address of the device itself is set. If the alarm output signal demodulated by the signal transmission unit is read and the address of the device itself set in the address setting unit is read and the demodulated alarm output signal is given to the device. An arithmetic processing unit that outputs an alarm signal according to the content of the demodulated alarm output signal, an output control unit that produces an output for energizing an alarm device according to the content of the alarm signal of the arithmetic processing unit, and the signal. An alarm unit consisting of a carrier detection unit that detects if the transmission signal is not on for a predetermined period as an occurrence of disconnection or an abnormal state of the signal line, and an input terminal through a signal line to an output terminal of the master unit. A signal transmission unit that is connected and receives and demodulates output signals from the signal transmission unit of the master unit, an address setting unit in which the address of the device itself is set, and a signal that is demodulated by the signal transmission unit. Read out the output signal and read the address of the device itself set in the address setting unit, and if the demodulated output signal is output to the device, the demodulated output signal On the signal line, an arithmetic processing unit that outputs a signal indicating that the output signal is ON or OFF, an output control unit that outputs an output that indicates whether the load is ON or OFF according to the content of the signal ON or OFF of the arithmetic processing unit. The transmission signal for a predetermined period If there is not, a control unit consisting of a carrier detecting unit for detecting the disconnection of the signal line or occurrence of an abnormal state is provided, and the carrier detecting unit disconnects the signal line or the master unit, an alarm unit, or an abnormal occurrence of the control unit. A demand control device characterized in that it is adapted to detect