JPH09233571A - Low-voltage distribution line conveyance transmission terminal equipment and automatic gauge examination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To switch a transmission route corresponding to the change of transmission characteristics caused by the change of power load at distribution line conveyance communication equipment having a low-voltage distribution line as a transmission line. SOLUTION: Terminal equipment 2 measures the reception level value of carrier wave continued longer than determined time and transmits this reception level value as communication state information. A repeater 1 receives this communication state information and stores it in a communication possibility storage means 16. Corresponding to the time to execute automatic gauge examination and the consumer address number of the terminal equipment 2, the repeater 1 selectively controls 1st and 2nd transmitting means 131 and 132 according to the communication state information stored in the communication possibility storage means 16, transmits a gauge examination command signal, selectively controls 1st and 2nd receiving means 141 and 142 and receives gauge examined value information transmitted from the terminal equipment 2.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-voltage distribution line carrier transmission terminal device having a low-voltage distribution line as a transmission line and an automatic meter-reading device equipped with this low-voltage distribution line carrier terminal device.

2. Description of the Related Art A low voltage distribution line type automatic meter reading device is
The parent station and the distribution line carrier transmission terminal installed on the pole transformer side (hereinafter referred to as a repeater) communicate with each other via a transmission medium, and the relay line and the distribution line carrier transmission terminal installed on the consumer (hereinafter A terminal device) uses a low-voltage distribution line as a transmission line to modulate meter-reading information by a frequency shift keying method (also called FSK method), and superimposes it on a commercial frequency for communication.

Since the low-voltage distribution line is a line laid to supply electric energy to consumers, the line characteristic seen from one end of the low-voltage distribution line is the power consumption of consumers (daytime Or there are many first nights and few late nights),
And, it changes depending on the consumption pattern (type of electrical equipment that is a load). The line impedance is low during the day or early night and high at midnight. The S / N ratio deteriorates when a device using a small AC commutator motor (for example, an electric vacuum cleaner) that accompanies the generation of electric sparks is in operation. The single-phase three-wire low-voltage distribution line, the power consumption of the first distribution line and the neutral wire, and the consumption form and the power consumption of the second distribution line and the neutral line, and the consumption form are not necessarily equal, Difference occurs in line impedance. In a distribution line that is a distributed constant line, a difference in line impedance means that there is a difference in phase rotation on the distribution line at the carrier frequency, and there is a difference between the first distribution line and the neutral line and the second line. There is a place between the distribution line and the neutral line where the phase relationships of the carrier waves transmitted in the same phase cancel each other out. As mentioned above, in the communication using the low-voltage distribution line as the transmission line, a request is generated irrespective of the power consumption of the consumer and the communication time, so that it is difficult to always secure the communication. The present invention has been made in view of the above points, and an object thereof is an automatic meter reading device that uses a low-voltage distribution line as a transmission line, and a repeater that ensures communication against changes in the line characteristics of the low-voltage distribution line. It is to provide a terminal and an automatic meter-reading device.

In order to achieve the above object, in the first invention, in an automatic meter-reading device in which a repeater and a terminal communicate with each other using a low-voltage distribution line as a transmission line, the terminal is a low-voltage distribution line. A measuring means for measuring the reception level of the carrier wave received further and a storage means for storing the numerical value of the reception level measured by this measuring means are provided. When the terminal device receives the first command message transmitted by the relay device, the terminal device transmits the numerical value of the reception level stored in the storage means as communication state information in a reply message. In the second aspect, the terminal further includes a classifying unit that classifies the reception level measured by the measuring unit into a plurality of numerical ranges set in advance.
The terminal classifies the reception level values of the carrier waves measured by the measurement section by the classification section, and stores the classification range including the reception level values in the storage section. When the terminal device receives the first command message transmitted by the repeater, it is assumed that this classification range stored in the storage means is transmitted in the reply message as the communication state information. In the third invention, the terminal device is provided with a counting means for receiving the second command message transmitted by the repeater and adding the numerical value 1 when the second command message is normally received. When the terminal device receives the first command message transmitted by the relay device, the terminal device transmits the numerical value accumulated by the counting means as the communication state information by the reply message. According to a fourth aspect of the present invention, in a repeater of an automatic meter-reading device that uses a single-phase three-wire low-voltage distribution line as a transmission line to communicate between a terminal and a repeater, A second transmitting means for transmitting a signal between the first distribution line and a first transmitting means for transmitting a signal between the neutral line and the second distribution line; And a second receiving means for receiving a signal. The repeater receives the signal transmitted by the first transmitting means and the signal transmitted by the terminal by the first receiving means and the second receiving means, and then the second transmitting means transmits the signal by the terminal. The signal transmitted by the container is received by the first receiving means and the second receiving means. In a fifth aspect of the present invention, in a repeater of an automatic meter-reading device that uses a single-phase three-wire low-voltage distribution line as a transmission line to communicate between a terminal and a repeater, A second transmission line for transmitting a signal between the neutral line and the second distribution line, comprising a first transmission unit for transmitting a signal between the distribution line and the first reception unit for receiving the signal. It comprises a transmitting means and a second receiving means for receiving a signal. The repeater receives the signal transmitted by the first transmitting means and the second transmitting means at the same time in the same phase of the carrier wave of the signal and the terminal device transmits, by the first receiving means and the second receiving means, Next, it is assumed that the first transmitting means and the second transmitting means simultaneously transmit carrier waves of signals in opposite phases, and the signal transmitted by the terminal is received by the first receiving means and the second receiving means. . In a sixth invention, in the repeater described in the fourth invention and the fifth invention, the repeater includes a clock means and a communication availability storage means. The repeater causes the first transmitting means and the second transmitting means to transmit a carrier wave of a predetermined time length or a second command signal each time the clock means arrives at a plurality of predetermined times. The repeater transmits the first command signal, communicates with the terminal device, and stores the carrier wave or the time when the second command signal is transmitted and the communication status information transmitted by the terminal device in the communication availability storage means. It shall be. In the seventh invention, in the automatic meter reading device, which connects the master station and the relay via a transmission medium, and connects the relay and the terminal as a low-voltage distribution line as a transmission path, the relay is
A repeater described in the sixth invention, and a terminal device is the terminal device described in any one of the first invention to the third invention.
The repeater receives the first meter reading command signal transmitted from the master station, and stores this terminal in the communication availability storage means by the time when this first meter reading command is received and the terminal device designated by this meter reading command. The communication status information of the device is read, the first transmission means and the second transmission means are selectively controlled according to the communication status information, a meter reading command signal is transmitted, and communication is performed with the terminal. It is assumed that the repeater receives the meter reading information transmitted by the terminal device, communicates the meter reading information with the master station via the transmission medium, and the master station receives the meter reading information. In the eighth invention, in the automatic meter-reading device, wherein the master station and the repeater are connected via a transmission medium, and the repeater and the terminal are connected by using a low-voltage distribution line as a transmission line, the repeater is the fourth one. The relay device is described in the invention and the fifth invention, and the terminal device is the terminal device described in any one of the first invention to the third invention. The master station sets a communication availability storage area in its own storage device. The master station transmits a communication state information command to the repeater via the transmission medium each time its own clock device arrives at a plurality of predetermined times. The repeater receives this communication state information command and controls the first transmission means and the second transmission means to transmit a carrier wave of a predetermined time length or to distribute the second command signal to a low voltage. Send to the wire. The master station transmits the first command signal to the repeater via the transmission medium. The repeater is
The first command signal is received, the first transmitting means and the second transmitting means are controlled, and the first command signal is transmitted to the low voltage distribution line. The repeater receives the return message of the communication status signal transmitted by the terminal device, and transmits this communication status signal to the master station via the transmission medium. The master station stores the time when the communication status information command is transmitted and the communication status signal in the communication availability storage area of the storage device. The master station, a second meter reading command containing the communication state information stored in the communication availability storage area by the time and the terminal device for carrying out automatic meter reading and the information designating this terminal device, via the transmission medium, Send to the repeater. The repeater receives the second meter reading command, selectively controls the first transmitting unit and the second transmitting unit according to the information content of the second meter reading command, and transmits the meter reading command signal to the low voltage distribution line. To do. The relay device receives the meter-reading information transmitted from the terminal device and communicates the meter-reading information with the master station via the transmission medium.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a single-phase three-wire low-voltage power distribution line for an automatic meter reading device that uses a single-phase three-wire low-voltage power distribution line as a transmission line to communicate meter-reading information between a repeater 1 and a terminal 2. 2 shows a connection form between the relay device 1 and the terminal device 2. The first transmitting means (denoted by S1 in FIG. 1) and the first receiving means (denoted by R1 in FIG. 1) of the repeater 1 are connected between the neutral line 3 and the first distribution line 4. The second transmitting means (denoted by S2 in FIG. 1) and the second receiving means (denoted by R2 in FIG. 1) are connected between the neutral wire 3 and the second distribution line 5. Terminal 2
Are connected between the neutral line 3 and the first distribution line 4 between the customer (b) and the customer (d), and the customer (a) and the customer (c)
Is connected between the neutral line 3 and the second distribution line 5, and the consumer (e) is connected between the first distribution line 4 and the second distribution line 5. The power consuming devices (denoted by L in FIG. 1) of the consumer (a), the consumer (b), the consumer (c), the consumer (d), and the consumer (e) are Connect to each low voltage distribution line. The power consumption amount of the power consumption device L changes independently of each other regardless of the time at which the automatic meter reading is performed between the relay device 1 and the terminal device 2. The relay 1 communicates the communication status information with the terminal 2 at a predetermined time, and stores this time and this communication status information in the communication availability storage means (denoted as LM in FIG. 1) 16. In FIG.
An example of communication status information stored in the communication availability storage unit 16 is shown. In FIG. 2, the blank column indicates that the communication status information cannot be communicated between the repeater 1 and the terminal 2. The column of customers (a) at time 1 in FIG. 2 indicates that the power consumption of each customer is in a normal state, and that the signal coupling between the first distribution line and the second distribution line ( (Also referred to as "complex"), the communication status information is shown, and it indicates that the relay 1 and the terminal 2 connected between the neutral line and the distribution line having the same name can communicate with each other. When transmitting the meter reading command, the repeater 1 selectively controls the transmitting unit and the receiving unit according to the communication status information storage content of the communication availability storing unit at the time when the meter reading command is transmitted to the consumer or at the time when the meter reading command is closest to the consumer. , Communicates meter reading information with the terminal device 2.

【Example】

[First Embodiment] FIG. 3 shows an example of a terminal 2 according to the first invention.
The structure of an Example is shown. FIG. 3 (a) is an end according to the first invention.
The functional configuration of the terminal device 2 is shown in FIG.
It is configured by using a semiconductor device called a black processor
An example is shown. The terminal device 2 in FIG. 3A is an automatic meter reading device.
Common Functional Configuration 22 to Terminals and Functions According to the First Invention
And the configuration 21. Functional configuration 22 is low voltage distribution
Connect the wire to the filter section (denoted as Fil in Fig. 3) and
The output of the filter is used as the output of the transmitter and the input of the receiver.
Connect to each and connect the input of the transmitter and the input of the receiver to the controller
Connect to each and further connect the control unit to the communication unit of the electricity meter
I do. Carrier signal superimposed on commercial frequency voltage of low voltage distribution line
Is separated by the filter unit and input to the receiving unit.
Demodulates this carrier signal and inputs the demodulated signal to the control unit
I do. The control unit, for example, according to the command of the demodulated signal,
If the command is a meter reading command, the product of the communication part of the watt hour meter and the power amount
Communicate the calculated value and send back the measured value as meter reading information.
Input to the sending part by a sentence, and the sending part uses the carrier wave to
Modulates the sentence and sends it to the low voltage distribution line through the filter section.
You. The functional configuration 21 is a functional configuration for the input of the measuring means 211.
22 is connected to the output of the filter section and the measuring means 211 is output.
Force is connected to the input of the storage means 212,
The output is connected to the controller of the functional configuration 22. Measuring means 21
1 is more than the specified time included in the output of the filter unit
Measure the reception level of the continuous carrier wave, and receive the reception level.
The signal level value is output to the storage means 212, and the storage means 21
2 stores this reception level numerical value. The control unit is the receiving unit
When the first command telegram is received, the storage means 212
Reply message with stored reception level value as communication status information
And assemble this, input this reply message into the sending unit, and the sending unit
This return message is modulated by the carrier wave and passed through the filter section.
Send to low voltage distribution line. 3 (b) is shown in FIG. 3 (a).
The control unit of the terminal device 2 and the storage means 212 are
Sessa (referred to as CPU in FIG. 3B) 223 and the program
RAM memory (referred to as ROM in FIG. 3B) 221
Data memory (referred to as RAM in FIG. 3B) 222
The measuring means 211 is constituted by
In FIG. 3B, it is described as Fil) 2111 and the detection unit (FIG. 3).
In (b), written as Det) 2112 and analog digital
The conversion unit (described as A / D in FIG. 3B) 2113
Be configured. The program memory 221 is an automatic meter reading device.
22 areas related to the function 22 common to the terminals of the
21 areas according to the invention. Data memo
Lee 222 is a function 22 common to the terminals of the automatic meter reading device.
There are 22 areas related to the invention and 21 areas related to the first invention.
It consists of. The output of the filter section of the functional configuration 22 is
Filter unit 2111 is connected to the input of the filter unit 2111.
Only the carrier wave is passed and output. Output from the filter unit 2111
The carrier wave to be connected is connected to the input of the detection unit 2112, and
112 detects this carrier wave, smoothes it, and receives the carrier wave.
Convert to a DC voltage proportional to the bell and
Input to log digital converter. Furthermore, the detection unit 2112
If the input of the carrier wave continues for a specified time,
The carrier wave detection signal is output to the microprocessor 223.
You. The microprocessor 223 uses this carrier wave detection signal.
21 areas of the program memory 221 by inputting
Analog-to-digital conversion signal depending on the program stored in
(Indicated as A / D signal in Fig. 3 (b)) is an analog digital
Output to the analog converter, and the analog-digital converter
The input DC voltage is changed by the analog digital conversion signal.
This digital value is converted to a digital
Output to the server 223. Microprocessor 223
The digital value of 21 in the area of the data memory 222.
Remember. The microprocessor 223 has a first receiving unit.
2 of the program memory 221 when the command message of
Data memory by the program stored in the area 1
Proportional to the carrier reception level stored in the area 21 of 222
Returns the digital value of the DC voltage as communication status information
Assemble the message and input it to the transmitter.
Riko's reply message is modulated and low-voltage power is distributed via the filter.
Send to the line. [Second Embodiment] FIG. 4 shows an example of a terminal device 2 according to the second invention.
The structure of an Example is shown. FIG. 4 (a) is an end according to the second invention.
The functional configuration of the terminal device 2 is shown in FIG.
It is configured by using a semiconductor device called a black processor
An example is shown. The terminal device 2 in FIG. 4A is an automatic meter reading device.
Common functional configuration 22 of the terminals and the function according to the second invention
And the configuration 21. The functional configuration 21 is a measuring means.
Connect the input of 213 to the output of the filter section of the functional configuration 22
Then, the output of the measuring means 213 is connected to the input of the classifying means 214.
Then, the output of the classification means 214 is input to the storage means 212.
Connect the output of the storage means 212 to the control unit of the functional configuration 22.
Connect to The measuring means 213 is included in the output of the filter section.
Reception level of carrier wave that continues for a specified time
Is measured and the reception level numerical value of the reception level is classified by the classification means 21.
4 and the classification means 214 divides this reception level numerical value.
Like. For example, the classification of the classification means 214 is the number of reception levels.
The value is a low reception level value at which almost no communication is possible
It is the reception level value that sometimes becomes impossible to communicate with the level value of
The third level that can communicate with the second level value that is approximately 100%
The value. This reception level numerical value is first in the classification means 214.
Level value, second level value, or third level value
Outputs the level value to which the received level value belongs
Then, the storage means 212 stores this level value. Control unit
When the first command message is received from the receiving unit,
Returns the level value stored in the step 212 as communication status information
Assemble the message, input this reply message into the sending part, and send
The unit modulates this return message with a carrier wave and passes it through the filter unit.
And send it to the low voltage distribution line. FIG. 4 (b) is the same as FIG.
The control unit of the terminal 2 shown in FIG.
Processor 223, program memory 221, and data
It is composed of a memory 222 and a measuring means 213.
Filter section 2111 and detection section 2112 for classification.
The means 214 is used as a comparison unit (indicated as Cop in FIG. 4B) 2
114 and a digital-analog converter (D / in FIG. 4B)
2115). Program memo
The Lee 221 has a function 22 common to the terminals of the automatic meter reading device.
There are 22 areas related to the invention and 21 areas related to the second invention.
It consists of. The data memory 222 is an automatic meter reading device.
22 areas related to the function 21 common to the terminal and the second
21 areas related to light. Functional configuration 22
The output of the filter unit of the is connected to the input of the filter unit 2111
However, the filter unit 2111 passes only the carrier wave and outputs it.
The carrier wave output by the filter unit 2111 is detected by the detection unit 2112.
, And the detection unit 2112 detects this carrier wave.
, Smooth and convert to a DC voltage proportional to the carrier reception level.
This DC voltage is input to the first input of the comparison unit 2114.
Power. Further, the detection unit 2112 determines that the carrier wave is input.
If the carrier detection signal is
Output to the processor 223. Microprocessor 22
3 is programmed by the input of this carrier wave detection signal.
By the program to be stored in the area 21 of Molly 221
The first level value, the second level value and the third level value
Sequentially output the specified numerical value to the digital-analog converter,
The digital-to-analog conversion section sequentially uses this value as the first level.
Direct current proportional to the second level value and the third level value
The voltage is converted into a DC voltage, and this DC voltage
Enter in the input. The comparison unit 2114 has a first input and a second input.
The DC voltage input to each of the
The comparison output (for example, the first input voltage ≥ the second input voltage
In case of pressure, binary 1 is output and the first input voltage <second
If the input voltage is 0, the binary number 0 is output)
This comparison output is input to the microprocessor 223.
The microprocessor 223 records this comparison output as a data memo.
The data is stored in the area 222 of Lee 222. Microprocessor
The server 223 is a professional when the receiving unit inputs the first command message.
A program to be stored in the area 21 of the gram memory 221.
Stored in the area 21 of the data memory 222 according to
Assemble a reply message using the comparison output as communication status information,
Input to the transmitter, and the transmitter sends this reply message by carrier wave.
Modulate and transmit to the low voltage distribution line through the filter unit. [Third Embodiment] FIG. 5 shows an example of a terminal 2 according to the third invention.
The structure of an Example is shown. FIG. 5 (a) is an end according to the third invention.
The functional configuration of the terminal device 2 is shown in FIG.
It is configured by using a semiconductor device called a black processor
An example is shown. The terminal device 2 in FIG. 5A is an automatic meter reading device.
Common Functional Configuration 22 of Terminals and Functions According to Third Invention
And the configuration 21. The functional configuration 21 is a counting means.
Connect the input of 215 to the output of the receiver of functional configuration 22,
The output of the counting means 215 is connected to the control unit of the functional structure 22.
You. The counting unit 215 includes a second counting unit included in the output of the receiving unit.
When the command message is monitored and the second command message is detected normally,
Add binary 1 to its counter. The control unit is the receiving unit
When the first command message is received, the counting means 215
Establish a reply message using the count value of the counter as communication status information
Input this reply message to the transmitter, and the transmitter
This reply message is further modulated and low-voltage power distribution is performed via the filter section.
Send to the line. FIG. 5B is a terminal device 2 shown in FIG.
Of the microprocessor and the counting means 215.
3, program memory 221, and data memory 222
And Program memory 221 is automatically detected
22 areas related to the function 22 common to the terminals of the needle device and
It is configured by the area of the function 21 according to the third invention.
The data memory 222 is common to the terminals of the automatic meter reading device.
22 areas related to the function 22 and 21 related to the third invention
Area. Microprocessor 223
Is a program stored in the program memory 221.
By this, the electronic message input by the receiving unit is monitored. Micropro
Each time the sessa 223 detects the second command message, the data
2 in the counting area to be stored in the area 21 of the memory 222.
Adds a decimal number 1. The microprocessor 223 receives
Program memory 2 when the department inputs the first command message
Data is stored by the program stored in the area 21 of 21.
Communicates the count value of the count area of the area 222 of the memory 222
Assemble a reply message as status information, input it to the sending unit,
The transmitter modulates this return message with the carrier wave and filters it.
To the low voltage distribution line through the section. [Fourth Embodiment] FIG. 6 shows an example of the repeater 1 according to the fourth invention.
The structure of an Example is shown. FIG. 6 (a) shows the middle of the fourth invention.
The functional configuration of the relay 1 is shown in FIG.
It is configured by using a semiconductor device called a black processor
An example is shown. The repeater 1 in FIG. 6A is a single-phase three-wire low
The neutral line 3 of the pressure distribution line and the first distribution line 4 are connected to the filter unit 1.
21 to connect the output of the filter unit 121 to the first transmitter.
The output of the stage 131 and the input of the first receiving means 141
Connect each and connect the neutral wire 3 and the second distribution line 5 to the filter section.
122, and outputs the output of the filter unit 122 to the second transmission.
The output of the means 132 and the input of the second receiving means 142 are
Connect each one. The control unit 11 uses the first transmission means 131.
Input, the output of the first receiving means 141 and the second transmitting means
The input of 132 and the output of the second receiving means 142 are respectively
Connected again, and further clock means (denoted as T in FIG. 6A) 1
5 and the communication propriety storage means 16 are connected. Filter unit 1
21 and the filter unit 122 pass only the carrier signal and
When transmitting the signal, the carrier signal is superimposed on the commercial frequency voltage
At reception, the carrier signal is separated from the commercial frequency voltage. System
The control unit 11 uses the clock means 1 at a plurality of predetermined times.
Each time 6 is reached, it is determined via the first transmission means 131.
A carrier wave that continues for a certain time, or a second command message is transmitted,
Then continue for a defined time via the second transmission means 132
A carrier wave or a second command message is transmitted. Continue to
The relay 1 sends the first command message via the first transmission means 131.
The reply message of the communication status information that is sent and sent by the terminal device 2 is
It is received by the first receiving means 141 and the second receiving means 142.
And stores this communication status information in the communication availability storage means 16.
Then, the first command message is transmitted via the second transmitting means 132.
The reply message of the communication status information that is sent and sent by the terminal device 2 is
It is received by the first receiving means 141 and the second receiving means 142.
And stores this communication status information in the communication availability storage means 16.
I do. Multiple demands for power from single-phase, three-wire distribution lines
The power consumption of the house is normal, and the first distribution line and the second
In the time period when the signal coupling between the second distribution line is weak, the relay is performed.
The first finger transmitted by the device 1 via the first transmission means 131.
The warning message is the end connected between the neutral wire 3 and the first distribution line 4.
The terminal device 2 receives and the terminal device 2 returns the communication status information.
The repeater 1 sends the reply message to the first receiving means.
141, and the repeater 1 receives the second transmission means 132.
The first command message sent via the
The terminal device 2 connected to the electric wire 5 receives and receives this terminal device.
2 transmits a reply message of communication status information, and the repeater 1
The reply message is received by the second receiving means 142. FIG.
Of the contents stored in the communication availability information storage means 16 in this case.
An example is shown in the columns of customer (a) and customer (b). Single phase three
Customers who receive power from the distribution line (for example, the demand shown in Fig. 1)
The power consumption of the important house (a) increases, and the first distribution line 4
The signal is tightly coupled to the second distribution line 5 (for example, in the consumer of FIG. 1).
During the time period when (e) power consumption increases), the repeater 1
Of the second transmission means 132 of the predetermined time duration to be transmitted
Carrier wave, or the first command message and the second command message
Greatly attenuated at the point of customer (a) and far from this point
Reaching the terminal 2 of the customer (for example, the customer (C) in FIG. 1)
The signal to be transmitted becomes a signal level at which communication is impossible, and the repeater 1
For a fixed time period transmitted by the first transmission means 131 of
Carrier wave, or the first command message and the second command message
From the first distribution line 4 to the consumer (e) power consumption equipment
A signal is coupled to the second distribution line 5 via the
The signal reaching the terminal device 2 of the
You. In this time zone, the terminal device 2 of the consumer (C) transmits
The reply message is the power consumption of the consumer (e) from the second distribution line 5.
Like the first distribution line 4, the signal coupling occurs through the cost equipment.
Then, the first receiving means 141 of the repeater 1 receives. FIG.
An example of the stored contents of the communication availability storage means 16 in this case
Shown in the column of Customer (C). Repeater 1 performs automatic meter reading
Whether communication is possible depending on the time of day and the customer who installs the terminal 2
According to the communication state information stored in the storage means 16, the first
Selection control of the transmission means 131 and the second transmission means 132
Then, the meter reading command telegram is transmitted, and the second receiving means 141 and the first receiving means 141
The second receiving means 142 is selectively controlled to receive a reply message.
You. FIG. 6B is a control unit 1 of the repeater 1 shown in FIG.
1 and the clock means 15 and the communication availability storage means 16 are micro.
A processor (described as CPU in FIG. 6B) 111 and a processor
Program memory (referred to as ROM in FIG. 6B) 11
2 and data memory (referred to as RAM in FIG. 6B) 1
And 13 together. The microprocessor 111
According to the program stored in the program memory 112
It operates by counting the clock signal of its own, measuring the time,
This time and the preset time in the program memory
Each time the time matches, it is determined via the first transmission means 131.
A carrier wave that continues for a certain time, or a second command message is transmitted,
Then continue for a defined time via the second transmission means 132
A carrier wave or a second command message is transmitted. Microp
The processor 111 transmits the first command message to the first transmission means 1
The first receiving means 141 and the second receiving means which are transmitted via 31
The step 142 receives the reply message of the communication status information, and
The communication status information of the
It is stored in the reliability storage area, and then the first command message is
And the first receiving means 141 for transmitting via the transmitting means 132.
Reply message of communication status information by the second receiving means 142
In the data memory 113.
It is stored in the communication availability storage area set to. Automatic meter reading
If it is applied, the repeater 1 is equipped with the time and the end of the automatic meter reading.
Depending on the customer installing the end device 2, the microprocessor 1
11 is stored in the communicability storage area of the data memory 113.
Of the communication status information at the same time or the closest time
According to the communication status information, the first transmission means 131 and the second transmission means
Receiving means 132, first receiving means 141, and second receiving means
142 and selectively control, and communicate meter reading information with this terminal 2.
I do. [Fifth Embodiment] FIGS. 7 and 8 are relays according to the fifth invention.
The structure of one Example of the container 1 is shown. FIG. 7A shows a fifth invention.
7 is a functional configuration of the repeater 1 according to FIG.
The phase of the carrier wave of the signal transmitted by the repeater 1 is shown. FIG.
(A) shows the repeater 1 according to the fifth invention as a microprocessor.
An example of a configuration using a semiconductor called a
(B) and (c) are the carrier waves of the signal transmitted by the repeater 1.
Indicates the phase. The repeater 1 in FIG. 7A is a single-phase three-wire low-voltage
The neutral line 3 of the electric wire and the first distribution line 4 are connected to the filter unit 121.
The output of the filter unit 121 to the first transmitter 13
3 and the input of the first receiving means 141 are connected respectively.
Then, connect the neutral wire 3 and the second distribution line 5 to the filter section 122.
And the output of the filter unit 122 is connected to the second transmitter 13.
4 and the input of the second receiving means 142 are connected to each other.
Continue. The control unit 11 receives the input of the first transmitter 133 and the first transmitter 133.
Output of one receiving means 141 and input of second transmitter 134
And the output of the second receiving means 142 and communication with the clock means 15 are possible.
Rejection storage means 16 are connected to each other, and
Connect the step 135. The carrier wave oscillating means 135 is an oscillator.
The output of the oscillator is the first transmitter.
133, and the output of the oscillator is connected via switching means.
Connected to the second transmitter 134, and the switching means is the control unit 1.
Switching control is performed by the output of 1. Of the carrier wave oscillating means 135
The oscillation frequency of the oscillator is the frequency of the carrier wave. fill
The filter unit 121 and the filter unit 122 pass only the carrier signal.
However, when transmitting a signal, the carrier signal is superimposed on the commercial frequency voltage.
The carrier signal is separated from the commercial frequency voltage when the signal is received.
I do. The control unit 11 controls the time at a plurality of predetermined times.
Each time the measuring means 16 arrives, the first transmitter 133 and the second transmitter 133
A carrier wave that lasts for a time determined by the transmitter 134,
Alternatively, the second command message may be transmitted in the same phase as shown in FIG.
Transmit or modulate with carrier wave of the same phase and transmit, then carry
The switching means of the transmitting and oscillating means 135 is controlled to be switched, and
When determined by the transmitter 133 and the second transmitter 134
Figure 7 (c) shows the carrier wave that continues for the second time or the second command message
The carrier wave of the opposite phase shown in the figure or the carrier wave of the opposite phase
Send it. The repeater 1 includes a first transmitter 133 and a second transmitter 133.
The first command message is transmitted in phase with the transmitter 134 of
Communication state information transmitted by the terminal 2 after being modulated by waves and transmitted
A first receiving means 141 and a second receiving means for sending a reply message of information.
142 and receives this communication status information as to whether or not communication is possible.
The first transmitter 133 and the second transmitter 133
The first command message is transmitted by the transmitter 134 to the carrier wave of the opposite phase.
Communication status information that is modulated by
The reply message of the first receiving means 141 and the second receiving means 1
42, and this communication status information is stored by the communication enable / disable.
It is stored in the means 16. Receives power from a single-phase three-wire distribution line
Power consumption of multiple consumers is normal, and
When the signal coupling between the first distribution line and the second distribution line is weak
In the inter-zone, the first transmitter 133 and the second transmission of the repeater 1
Command transmitted by the carrier with the same phase as that of the instrument 134
In order to add the message in the terminal device 2, for example, in FIG.
The consumer (e) can receive, and the first transmitter 133
The second transmitter 134 transmits with a carrier wave in the opposite phase.
In order to subtract the signal in the terminal 2, for example, in FIG.
The customer (e) cannot receive. In Figure 2, in this case
Example of contents stored in the communication availability information storage means 16
It shows in the column of (e). In Fig. 1, customers (e) are excluded
All consumers are required to use the first transmitter 133 and the first transmitter 133 of the repeater 1.
The carrier waves of the same phase that are simultaneously transmitted by the two transmitters 134
Signal of either the carrier signal or the carrier signal of opposite phase
Is received, and communication with the repeater 1 is possible. Power from distribution line
The electricity of the consumer who receives the supply (for example, the consumer (b) in Fig. 1)
Power consuming equipment is an inductive or capacitive
Power load and low-voltage distribution line (the first distribution in Fig. 1
Line) and the phase rotation of the carrier wave in the line composed of
180 at the point of the house (for example, customer (d) in FIG. 1)
And the communication between the first distribution line 4 and the second distribution line 5
Signals are tightly coupled (for example, the power consumption of the consumer (e) in Figure 1
(Increasing time), install in the customer at this point
The terminal device 2 has the first transmitter 133 and the second transmitter of the repeater 1.
Signal by the carrier wave of the same phase that the transmitter 134 and
Becomes unreceivable and the first transmitter 133 and the second transmitter
Of the carrier of opposite phase transmitted simultaneously with the transmitter 134 of
Signals are added and can be received. Figure 2 shows the communication in this case.
Example of contents stored in the reliability information storage means 16 Customer (d)
Column. The repeater 1 determines the time and the end of automatic meter reading.
Communication availability storage means 16 depending on the customer who installs the end device 2.
According to the communication status information stored in the first transmitter 133
And the phase of the transmission signal between the second transmitter 134 and
And sends a meter reading command message to the first receiving means 141 and the second receiving means 141.
The receiving means 142 and the receiving means 142 are selectively controlled to receive the reply message.
FIG. 8A is a control unit 11 of the repeater 1 shown in FIG.
, Clock means 15, communication availability storage means 16, carrier wave oscillator
The step 135 is connected to the microprocessor 111 and the program memory.
Molly 112, data memory 113 and filter (Fig. 8
In FIG. 8A, written as Fil) 133 and a filter (FIG. 8).
In (a), written as Fil) 134. Ma
The icroprocessor 111 is stored in the program memory 112.
It operates according to the stored program and has its own clock signal.
Square wave train with the same repetition period as the carrier frequency
make. Microprocessor 111 is a program memory
-Operates according to the program stored in 112,
Program memory that counts clock signals and measures time
-If the time preset in 112 matches this time
Each time, a rectangular wave train with the same repetition period as the carrier frequency
(Hereinafter referred to as rectangular wave train)
Input to the first transmitter 133 via the filter 123,
The square wave train is multiplied by a binary number 1 by its own operation unit, and
Through a filter 124 that passes only the carrier frequency through the square wave train.
Input to the second transmitter 134, and the first transmitter 133
And for a defined time via the second transmitter 134
The carrier wave or the second command message is transmitted. Figure 8 (b)
Square wave train in this case, output of filter 123 and filter
The phase relationship with the output of 124 is shown. Next, the microprocessor
The sensor 111 first passes the rectangular wave train through the filter 123.
Input to the transmitter 113 of the
This binary wave train is filtered by the filter 124.
Input to the second transmitter 134 via the first transmitter 1
For a defined time via 33 and the second transmitter 134
A carrier wave to be transmitted or a second command message is transmitted. FIG.
(C) shows the rectangular wave train in this case and the output of the filter 123.
The phase relationship of the output of the filter 124 is shown. Micropro
The sessa 111 transmits the first command message to the first transmission unit 133.
And a second transmitter 134 to transmit the same phase carrier wave.
Communication by the first receiving means and the second receiving means.
Receives the reply message of the communication status information and uses this communication status information as data.
Stored in the communication availability storage area set in the memory 113
Then, the first command message is sent to the first transmitter 133 and the second
The signal is transmitted by a carrier having an opposite phase via the transmitter 134,
The communication status information is received by the first receiving means and the second receiving means.
Receives reply message and stores this communication status information in data memory
It is stored in the communication availability storage area set in 113. Automatic
When carrying out meter reading, the relay device 1 carries out automatic meter reading.
Depending on the time and the customer installing the terminal 2,
Sessa 111 is a memory area of the data memory 113
Communication status information stored in the area at the same time or the closest
According to the communication status information of the time
Phase of carrier wave with second transmitter 134 and first receiving means 1
41 and the second receiving means 142 are selectively controlled, and this terminal
Communicates meter reading information with the device 2. [Sixth Embodiment] FIG. 9A shows an automatic inspection according to the sixth invention.
The structure of one Example of a needle device is shown. Communication between master station 6 and repeater 1
It is connected to the receiver via a transmission medium. Carry out automatic meter reading
In this case, the master station 6 and the repeater 1 have information (hereinafter
Lower consumer address number) and the first meter reading command signal
Are communicated via a transmission medium. The communication section of the repeater 1
Received the customer's address number and the first meter reading command,
The control unit of the relay 1 sets the reception time and the customer address number.
According to the communication status information stored in the communication availability storage means
First communication means, second communication means, first receiving means, and
The second receiving means is selectively controlled, and the terminal 2 and the meter reading information are transmitted.
I believe. The control unit and the communication unit of the repeater 1 are connected via a transmission medium.
Then, the meter reading information is communicated with the master station 6. [Seventh Embodiment] FIG. 9B shows an automatic inspection according to the seventh invention.
The structure of one Example of the master station of a needle device is shown. Automatic meter reading device
The master station 6 is composed of a computer device, and in FIG.
Computer device storage device 62, communication device 63, and clock device 64
And a control device 61 that collectively includes other devices.
The control device 61 has a plurality of units, which are predetermined by the clock device 64.
Information that specifies the repeater 1 each time
Repeater address number) and repeater 1 transmission means and reception
Control information with the means and a carrier wave that continues for a defined time, or
Is the transmission information of the second command message and the transmission information of the first command message.
As a communication status information command from the communication control device.
Send to the transmission medium. The repeater 1 sends this communication status information command
Repeater 1 received and specified by repeater address number
Is sent by itself according to the information contained in the communication status information command.
Communication control is performed by the terminal 2 by selectively controlling the communication means and the reception means.
Receives the reply message of the communication status information and
The reply message of the information is communicated via the transmission medium. Master station 6
The communication control device 63 of the
The control device 31 of the master station 6 receives this information return message
The communication status information is stored in the communication availability storage area of the storage device 62.
I do. When performing automatic meter reading, the master station 6
Time of implementation and address number of the customer who installs the terminal
And installing on a low-voltage distribution line that supplies power to this customer
Stored in the control device 61 by the relay address number of the relay
Communication status information stored in the communication availability storage area of the device 62,
According to the communication status information at the same time or the closest time
Repeater address number and customer address number and repeater
The control information of the transmitting means and the receiving means and the meter reading command are
As a meter reading command, it is sent from the communication control device to the transmission medium.
You. The repeater 1 receives this second meter reading command and
The repeater 1 specified by the dress number is the second meter reading finger.
According to the information contained in the decree
Selective control, send meter reading command to low voltage distribution line, terminal 2
Received the reply message of the meter reading value information sent by
The reply message of the meter reading value information is communicated via the transmission medium.
You. The parent station 6 uses the reply message of this meter reading value information as the meter reading information.
To process. FIG. 10 shows an example of the structure of the command message. Figure
10 (a) The telegram example 1 is transmitted by the master station 6 via the transmission medium.
An example of the command message to be performed is shown. No.1 block of text
Specify the type of this command message. No.1 block is automatically detected
In the case of needles, No. 3 block is a consumer ad that installs a terminal.
The No. 2 block supplies power to this consumer.
Repeater address of the repeater installed on the low-voltage distribution line to be supplied
Specify a number. In No.4 block, repeater 1 is terminal device 2
To control the selection of transmission means and reception means when communicating with
The master station sets the automatic meter reading execution time and repeater address.
Communication in the storage device using the mobile phone number and terminal address number
No. 4 according to the communication status information stored in the availability information storage area
Specify the block. If the No. 1 block is the communication status information
No.3 block is omitted or a specific address number
No. 4 block (for example, all zero numbers (0000))
Is a carrier wave that continues for a specified time, or a second command voltage.
Specify the statement. In the message example 2 of FIG. 10B, the repeater is low.
An example of the 2nd command telegram transmitted to a pressure distribution line is shown. Tech
The No. 1 block of the strike is a binary 1 character (eg
For example, JIS X0201 information exchange code DEL)
No. 2 block is a character with a binary number of 0 (for example,
For example, JIS X0201 information exchange code NUL)
No.3 block is a key in which binary numbers 1 and 0 appear alternately.
Character (for example, JIS X0201 information exchange code
Z). The message example 3 in FIG. 10C is a relay.
An example of the return electronic message which the apparatus 1 transmits to a transmission medium is shown. No.1
The block specifies the type of this reply message. No.1 block
No. 2 block is the repeater address number
No.3 block shows the terminal address number,
The No. 4 block shows the meter reading value. No.1 block is in communication
In the case of information, No. 2 block shows the repeater address number,
No. 3 block shows the terminal address number, and No. 4 block
KU indicates communication status information.

According to the present invention, there is provided an automatic meter-reading device which communicates the indicated value of a watt-hour meter of a consumer connected to the terminal between the repeater and the terminal by using a single-phase three-wire low-voltage distribution line as a transmission line by a communication telegram. The repeater communicates the communication status information with the terminal device at each of a plurality of predetermined times, and stores the communication status information in the communication availability storage means. According to the communication status information stored in the communication availability storage means, the repeater matches this time, or a time close to this time and the customer address number, depending on the time when the automatic meter reading is performed and the customer address number. And the receiving means are selectively controlled to communicate with the terminal device, thereby selecting the communication path that minimizes the influence of the change in the power load of the customer connected to the single-phase three-wire low-voltage distribution line, and the terminal device and the meter reading. Values can be communicated. In the first invention, the communication state information is a reception level value of a carrier wave that continues for a predetermined time or longer. The terminal device is provided with a receiving level measuring means for the carrier wave and a storing means, measures and stores the receiving level value of the carrier wave which continues for a predetermined time or longer, and when the first command is received, this receiving level value is communicated. It is sent as a status information by a reply message. It is possible to measure the reception level value without being affected by noise of the same frequency as the carrier that is discretely latent in the low voltage distribution line. In the second invention, the communication status information is a classification value of the reception level value of the carrier wave that continues for a predetermined time or longer. The terminal device includes a receiving level measuring unit for the carrier wave, a classifying unit, and a storage unit,
The reception level value of the carrier wave that continues for a predetermined time or longer is measured, classified, the classified value is stored, and when the first command is received, the classified value is transmitted as a communication state information by a reply message. By shortening the message length of the reply message, the communication time can be shortened and the storage capacity of the communication availability storage means of the repeater can be reduced. In the third invention, the communication state information is the number of times the second command is transmitted by the repeater and the number of times the second command is received by the terminal. By making the text of the second command into a block configuration in which a binary 1 building block, a binary 0 building block, and binary 1s and 0s appear alternately, the same frequency of the carrier wave that is latent in the low-voltage distribution line is used. It is possible to evaluate the influence of noise that is randomly generated in phase, in antiphase, and so on. In the fourth invention, the first transmitting means and the first receiving means of the repeater are connected between the neutral wire of the single-phase three-wire distribution line and the first distribution line, and the second transmission means is provided. And the second receiving means are connected between the neutral line and the second distribution line, the relay transmits the command message by the first transmitting means, and then this command by the second transmitting means. Send,
The reply message transmitted from the terminal is received by the first transmitting means and the second receiving means. When the power load of the customer who receives the power supply from the single-phase three-wire distribution line changes and the line characteristics (especially the attenuation characteristics) of the distribution line change, the repeater and terminal select a communication path and communicate. Can be done. In the fifth invention, the first transmitting means and the first receiving means of the repeater are connected between the neutral wire of the single-phase three-wire distribution line and the first distribution line, and the second transmitting means is provided. And the second receiving means are connected between the neutral line and the second distribution line, and the relay transmits the command message simultaneously by the first transmitting means and the second transmitting means in the same phase. A reply message sent by transmitting the command, then simultaneously transmitting the carrier wave in reverse phase by the first transmitting means and the second transmitting means, and transmitting by the terminal device by the first receiving means and the second receiving means. To receive. When the power load of a consumer who receives power from the single-phase three-wire distribution line changes and the line characteristic (particularly the phase characteristic) of the distribution line changes, the repeater and the terminal device can communicate with each other. In the sixth invention,
The repeater 1 includes a communication unit, and the communication unit and the master station 6 are connected via a transmission medium, and the repeater 1 and the terminal device according to any one of the first invention to the third invention. Uses a single-phase three-wire low-voltage distribution line as a transmission line and connects it to form an automatic meter-reading device. The repeater 1 transmits a carrier wave that continues for a predetermined time or a second command at a plurality of predetermined times, receives communication state information transmitted by the terminal device, and communicates this communication state information. It is stored in the storage means. When performing automatic meter reading, the master station 6 communicates the first meter reading command with the repeater 1 via the transmission medium. The repeater 1 selects the first transmission means and the second transmission means according to the communication status information stored in the communication availability storage means according to the time when the automatic meter reading is performed and the customer address number where the terminal device 2 is installed. The meter reading command is controlled, the meter reading command is transmitted, the meter reading value telegram transmitted by the terminal 2 is received by the first receiving unit and the second receiving unit, and the meter reading value is communicated with the master station 6 via the transmission medium. . Even when the power load of the customer who receives the power supply from the single-phase three-wire distribution line changes and the line characteristics of the distribution line change, the communication route can be selected and the automatic meter reading can be promptly executed. In the seventh invention, the master station 6 is provided with a storage area for communication availability in its own storage device, and the relay device 1 is provided via a transmission medium.
The relay device 1 is connected to the terminal device 2 by using a single-phase three-wire low-voltage distribution line as a transmission path. The master station 6 communicates the communication state information command with the repeater 1 at a plurality of predetermined times,
The repeater 1 transmits a carrier wave that continues for a predetermined time or a second command by this communication state information command, then transmits a first command, and receives the communication state information transmitted by the terminal device 2. Then, the communication state information is communicated with the master station 6 via the transmission medium. The master station 6 stores this communication status information in the communication availability storage area. When performing automatic meter reading, the master station 6 determines the time when the automatic meter reading is performed, the customer address number where the terminal 2 is installed, and the repeater address of the repeater 1 installed on the distribution line that supplies power to this customer. Assemble the telegram of the second meter reading command according to the communication status information stored in the communication availability memory by the number, and this second meter reading command, via the transmission medium,
Communicate with the repeater 1. The relay device 1 communicates with the terminal device 2 according to the communication state information of the second meter reading command, and the terminal device 2
The meter-reading value telegram transmitted by is received, and this meter-reading value is communicated with the master station 6. In an automatic meter reading device with multiple low-voltage distribution lines that have repeaters installed, the repeaters installed on adjacent distribution lines simultaneously send command signals, and these command signals wrap around and interfere with each other. Can be eliminated.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing one connection configuration of a repeater and a terminal according to a fourth aspect and a fifth aspect.

FIG. 2 is a diagram showing an embodiment of an array of communication status information stored in a communication availability storage unit.

FIG. 3 is a configuration diagram of an embodiment of a terminal device according to the first invention.

FIG. 4 is a configuration diagram of an embodiment of a terminal device according to the second invention.

FIG. 5 is a configuration diagram of an embodiment of a terminal device according to the third invention.

FIG. 6 is a configuration diagram of an embodiment of a repeater according to the fourth invention.

FIG. 7 is a configuration diagram of an embodiment of a repeater according to the fifth invention.

FIG. 8 is a configuration diagram of an embodiment of a repeater according to the fifth invention.

FIG. 9 is a configuration diagram showing one connection configuration of the automatic meter-reading device according to the sixth invention and the seventh invention.

FIG. 10 is a diagram showing an example of a message.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Repeater 2 Terminal 3 Neutral wire 4 First distribution line 5 Second distribution line 6 Master station 11 Control part 15 Clock means 16 Communication availability storage means 21 Functional configuration according to invention of terminal 22 Common to terminal Functional configuration 61 Control device 62 Storage device 63 Communication device 64 Clock device 111 Microprocessor 112 Program memory 113 Data memory 121,122 Filter 123,124 Filter 131 First transmission means 132 Second transmission means 133 First transmission Instrument 134 Second transmitter 141 First receiving means 142 Second receiving means 211, 213 Measuring means 212 Storage means 214 Sorting means 215 Counting means 221 Program memory 222 Data memory 223 Microprocessor 2111 Filter section 2112 Detection section 2113 Analog Digital Conversion unit 2114 comparing section 2115 digital-analog converter

Claims (8)

[Claims] 1. An automatic meter-reading device for communicating between a low-voltage distribution line transmission / transmission terminal installed in a customer and a low-voltage distribution line transmission / transmission terminal installed on a pole transformer side, using a low-voltage distribution line as a transmission line. In the low-voltage distribution line carrier transmission terminal installed in the consumer of, the measuring means for measuring the receiving level of the carrier wave received from the low-voltage distribution line and the storing means for storing the numerical value of the receiving level measured by this measuring means are provided. When the first command message sent by the low voltage distribution line carrier terminal installed on the pole transformer side is received, the numerical value of the reception level stored in the storage means is transmitted as the communication state information in the reply message. A low-voltage distribution line carrier transmission terminal characterized by the following. 2. The low-voltage distribution line carrier transmission terminal device according to claim 1, further comprising a classifying unit for classifying a numerical value of a reception level measured by the measuring unit into a plurality of numerical ranges set in advance, The low level distribution line carrier to be installed on the pole transformer side is stored by storing the classification range including the received level value of the carrier measured by the means by comparing with the multiple numerical value ranges When the first command message transmitted by the transmission terminal is received, this classification range is transmitted as the communication state information in the reply message instead of the numerical value of the reception level stored in the storage means. Electric wire carrier transmission terminal. 3. An automatic meter-reading device that uses a low-voltage distribution line as a transmission path and communicates between a low-voltage distribution line carrier-transmission terminal device installed at a customer and a low-voltage distribution line carrier-transmission terminal device installed on a pole transformer side. In the low-voltage distribution line carrier transmission terminal of, the measurement message is set in advance, and the low-voltage distribution line carrier terminal installed on the pole transformer side transmits this measurement message as the second command message and sends it to the customer. The low-voltage distribution line carrier transmission terminal to be installed is equipped with a counting means for incrementing by 1 when the measurement message received from the low-voltage distribution line is normally received. When the first command message transmitted by the low voltage distribution line carrier transmission terminal installed on the pole transformer side is received, the numerical value to be added to the counting means is transmitted in the reply message as the communication state information. Low voltage distribution line carrier transmission terminal . 4. A single-phase three-wire low-voltage distribution line is used as a transmission line, and communication is performed between a low-voltage distribution line carrier-transmission terminal installed at a customer and a low-voltage distribution line carrier-transmission terminal installed at a pole transformer side. In the low voltage distribution line carrier transmission terminal installed on the pole transformer side of the automatic meter reading device, send a signal between the neutral line of the single-phase 3-wire low voltage distribution line and the first distribution line. The first transmitting means and the first receiving means for receiving the signal, the second transmitting means for transmitting the signal between the neutral line and the second distribution line, and the second receiving means for receiving the signal. The first transmitting means transmits a signal, the first receiving means and the second receiving means communicate with the low-voltage distribution line carrier terminal installed in the customer, and then the second transmitting means. Transmits a signal and communicates with the low-voltage distribution line carrier terminal installed in the customer by the first receiving means and the second receiving means. Low-voltage distribution line carrier transmission terminal device according to claim. 5. A single-phase three-wire low-voltage distribution line is used as a transmission line, and communication is performed between a low-voltage distribution line carrier-transmission terminal installed at a customer and a low-voltage distribution line carrier-transmission terminal installed at a pole transformer side. In the low voltage distribution line carrier transmission terminal installed on the pole transformer side of the automatic meter reading device, send a signal between the neutral line of the single-phase 3-wire low voltage distribution line and the first distribution line. The first transmitting means and the first receiving means for receiving the signal, the second transmitting means for transmitting the signal between the neutral line and the second distribution line, and the second receiving means for receiving the signal. And a first transmitting means and a second transmitting means simultaneously transmit carrier waves of signals in the same phase, and the first receiving means and the second receiving means install the low-voltage distribution line carrier in the customer. Then, the first transmitting means and the second transmitting means simultaneously transmit the carrier waves of the signals in anti-phase and the first receiving means. Communicating with means and the low-voltage distribution line carrier terminal unit to be installed in the consumer by the second reception means, the low-voltage distribution line carrier transmission terminal device, characterized in that. 6. The low voltage distribution line carrier transmission terminal installed on the pole transformer side according to claim 4 or 5, wherein the low voltage distribution line carrier transmission terminal installed on the pole transformer side is It is provided with a clock means and a communication availability storage means, transmits the first command message at the communication time designated by the clock device, and receives the communication status information message transmitted by the low voltage distribution line carrier transmission terminal installed in the customer. The low-voltage distribution line carrier transmission terminal device, wherein the communication time and the communication state information are stored in the communication availability storage means. 7. A low-voltage distribution line carrier transmission terminal installed on the master station and pole transformer side, and a low-voltage distribution line carrier transmission terminal installed on the customer side are installed on the master station and pole transformer side. Connect and communicate with the low-voltage distribution line carrier transmission terminal device using a transmission medium,
In the automatic meter reading device that communicates between the low voltage distribution line carrier transmission terminal installed on the transformer side and the low voltage distribution line carrier transmission terminal installed on the customer side using the low voltage distribution line as a transmission line, The low voltage distribution line carrier transmission terminal installed on the transformer side is the low voltage distribution line carrier transmission terminal according to claim 6, and the low voltage distribution line carrier transmission terminal installed on the consumer is claim 1.
Or the low-voltage distribution line carrier transmission terminal device according to any one of claims 3 to 4, wherein the low-voltage distribution line carrier transmission terminal device installed on the pole transformer side is:
The carrier wave is transmitted at the communication time commanded by the clock means, the first command message is transmitted, the reply message of the communication status information is received,
This communication time and communication status information are stored in the communication availability storage means, the second command message is transmitted, the first command message is transmitted, the reply message of the communication condition information is received, and this communication time and communication The low-voltage distribution line carrier transmission terminal that stores the status information in the communication availability storage means and is installed on the pole transformer side is
When the first meter reading command is received from the master station, the reception time of this first meter reading command and the communication availability memory specified by the low voltage distribution line carrier transmission terminal installed in the customer specified by the first meter reading command According to the communication state information stored in the means, the first transmitting means and the second transmitting means are selectively controlled and a meter reading command is transmitted, and the first receiving means and the second receiving means are selectively controlled to the customer. An automatic meter-reading device characterized by receiving meter-reading value information transmitted from a low-voltage distribution line carrier terminal installed and transmitting this meter-reading value information to a master station. 8. A low-voltage distribution line carrier transmission terminal installed on the master station and pole transformer side, and a low-voltage distribution line carrier transmission terminal installed on the customer side, and installed on the master station and pole transformer side. Connect to the low-voltage distribution line carrier transmission terminal device with a transmission medium to communicate,
In the automatic meter-reading device that communicates through the low voltage distribution line transmission line between the low voltage distribution line transmission transmission terminal installed on the pole transformer side and the low voltage distribution line transmission transmission terminal installed at the customer Is a storage area for communication availability in the storage device, and the low-voltage distribution line transmission transmission terminal installed on the pole transformer side is the low-voltage distribution line transmission transmission terminal according to claim 5, and the low-voltage distribution line transmission transmission terminal installed in the customer The distribution line carrier transmission terminal is claim 1.
Or the low-voltage distribution line carrier / transmission terminal according to any one of claims 3 to 4, wherein the master station installs on the pole transformer side via the transmission medium at the communication time specified by its own clock device. The transmission condition information command is transmitted to the carrier transmission terminal device, and the low voltage distribution line carrier transmission terminal device installed on the pole transformer side upon receiving this communication condition information command transmits the carrier wave and transmits the first command message. Then, the communication status information message is received, this communication status information message is transmitted to the master station, the second command message is transmitted, the first command message is transmitted, the communication condition information message is received, and this communication The status information message is transmitted to the master station, the master station stores the communication time and these communication status information in the communication availability storage area of the storage device, and the master station communicates with the distribution line carrier transmission terminal installed in the customer. Communication time and distribution line carrier transmission terminal installed in customers According to the communication time and the communication status information stored in the communication availability storage area of the storage device, a second meter reading command is transmitted via the transmission medium to the low voltage distribution line carrier transmission terminal installed on the transformer side, and the meter reading information is transmitted. The automatic meter-reading device is characterized by: