JPH1051981A - Distribution line monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a distribution line monitoring system which can efficiently collect data of the state of distribution lines without using an exclusive communication line. SOLUTION: State data of a distribution line network 40 are measured by a plurality of monitoring slave offices 10 which are arranged at arbitrary positions of the distribution line network 40. A plurality of the monitoring slave offices 10 are divided into a plurality of groups. In each of the groups, a monitoring relay office 20 is assigned. Measured data of the monitoring slave offices 10 belonging to each group are once collected by the monitoring relay office 20 assigned to the group, and then transferred to a monitoring master office 30 by using a telephone network.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distribution line monitoring system for monitoring distribution line conditions.

[0002]

2. Description of the Related Art Conventionally, a distribution line monitoring system using a communication line carrier network has been used in order to efficiently operate a distribution line stretched in a tree shape. In this distribution line monitoring system, automated segmented switches and linked switches are installed on utility poles, etc. together with measuring devices that measure the status of distribution lines, and dedicated communication lines run along the distribution lines. Then, data measured by the measuring device is collected. Then, based on the collected data, the load status of the distribution line network is monitored, and according to the monitoring result, the distribution line load is distributed by remotely controlling the sectional switch and the link switch using the communication line. To eliminate overload on distribution lines.

[0003]

However, a conventional distribution line monitoring system using a communication line carrier network has a dedicated system for collecting data measured by a measuring device and for remotely controlling a segmented switch and a linked switch. There is a problem that the communication line must be drawn. In particular, in a wide area such as a county where the length of the distribution line is long, a dedicated communication line must be provided over a wide area, which is costly.

[0004] The present invention has been made based on the above circumstances, and an object of the present invention is to provide a distribution line monitoring system that can efficiently collect distribution line status data without using a dedicated communication line. I do.

[0005]

In order to solve the above-mentioned problems, a distribution line monitoring system according to the present invention comprises a distribution network installed at an arbitrary position in a distribution network, and a load state at the position of the distribution network. A plurality of monitoring slave stations for measuring data indicating, and a monitoring master station for monitoring the distribution network based on data measured by the plurality of monitoring slave stations, the plurality of monitoring slave stations Transmits the measured data to the monitoring parent station via a wireless transmission path, and the monitoring parent station transmits the data transmitted from the plurality of monitoring slave stations via the wireless transmission path, The reception is performed via a telephone line network connected to a wireless transmission path.

The above-mentioned distribution line monitoring system includes a plurality of monitoring relay stations each assigned at least one monitoring slave station, and the monitoring slave station allocates the measured data to the monitoring slave station. The monitoring relay station further includes a transmission unit that wirelessly transmits, the monitoring relay station receives data transmitted from the monitoring slave station allocated to the monitoring relay station, and the reception unit And a wireless communication terminal that transfers the data received at the monitoring master station via a wireless communication network, wherein the monitoring master station is transferred from the plurality of monitoring relay stations via a wireless communication network. It is preferable to have a telephone that receives data via a telephone network connected to the wireless communication network.

Here, the wireless communication network may be a dedicated wireless communication network in addition to a public wireless communication network such as a mobile phone and a PHS.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing a distribution line monitoring system according to a first embodiment of the present invention, FIG. 2 is a schematic block diagram of a monitoring slave station shown in FIG. 1, and FIG. 3 is a monitoring relay station shown in FIG. FIG. 4 is a schematic block diagram of the monitoring master station shown in FIG.

The distribution line monitoring system of this embodiment is shown in FIG.
As shown in FIG. 2, a plurality of switches 50 installed at arbitrary positions (for example, telephone poles) of a distribution network 40 stretched in a tree shape, and a plurality of monitoring slave stations 10 installed together with the switches 50 ₁ to 10 _n (hereinafter, also simply referred to as monitoring slave station 10)
When at least one of the plurality of monitoring slave station 10 is assigned monitoring relay station 20 ₁ to 20 _n (hereinafter, simply referred to as the monitoring relay station 20) each and, competent sales office, etc. of the distribution grid 40 of power companies And a monitoring master station 30 installed at
In the example shown in FIG. 1, to form a single group with a plurality of monitoring slave station 10 ₁ it is assigned to the monitoring relay station 20 _1. Also forms one group a plurality of monitoring slave station 10 ₂ is assigned to the monitoring relay station 20 _2. Similarly, the monitoring relay station 20 ₃ to 20 _n each is assigned a plurality of monitoring slave station 10 corresponding to form a respective group.

As shown in FIG. 2, the monitoring slave station 10 measures the situation data (data such as current value and voltage value) indicating the load situation of the distribution network 40 at the installation position of the monitoring slave station 10. Unit 11, a data storage unit 12 that stores the status data measured by the measurement unit 11 together with the measurement time, a wireless communication unit 13 that transmits and receives data to and from the corresponding monitoring relay station 20, Control unit 1 that controls each component
And 4.

As shown in FIG. 3, the monitoring relay station 20 includes a radio communication unit 21 for transmitting and receiving data to and from the monitoring slave station 10 assigned to the monitoring relay station 20. A data storage unit 22 for storing the status data sent from the assigned monitoring slave station 10;
It has a PHS (Personal Handy Phone) terminal 23 for transmitting and receiving data to and from 0, and a control unit 24 for controlling each component of the monitoring relay station 20. The monitoring relay station 20
Uses the PHS terminal 23 to transmit and receive data to and from the monitoring parent station 30. Therefore, as shown in FIG. 1, the PHS terminal 23 must be installed in a wireless zone of the PHS base station 60 (a range in which communication with the PHS terminal is possible). There is.

As shown in FIG. 4, the monitoring master station 30 includes, as shown in FIG. 4, a telephone 31 for transmitting and receiving data to and from the PHS terminal 23 of the monitoring relay station 20, and status data transmitted from the monitoring relay station 20. And a distribution network 4 based on the status data stored in the data storage unit 32.
The determination unit 33 that determines the load situation of 0 and estimates the switching situation of each switch 50 so that the distribution line load can be efficiently distributed.
A control unit 34 for controlling each component of the monitoring parent station 30;
Having.

The switch 50 changes the open / close state based on a control signal from the monitoring slave station 10 installed together with the switch 50. Thereby, the connection state of the distribution network 40 is changed.

Next, the monitoring slave station 10 and the monitoring relay station 20
The format of data transmitted between the monitoring relay station 20 and the monitoring master station 30 will be described.

First, the format of transmission data between the monitoring slave station 10 and the monitoring relay station 20 will be described. FIG. 5 is a diagram illustrating a format of data transmitted from the monitoring relay station 10 to the monitoring relay station 20, and FIG. 6 is a diagram illustrating a format of data transmitted from the monitoring relay station 20 to the monitoring relay station 10. As described above, transmission and reception of data between the monitoring slave station 10 and the monitoring relay station 20 are performed using wireless communication. The communication method at this time may be either serial communication or parallel communication.

As shown in FIG. 5, the format of the data transmitted from the monitoring slave station 10 to the monitoring relay station 20 includes, as shown in FIG. 5, the address of the monitoring relay station 20 to which the monitoring slave station 10 is assigned, and the transmission data. The configuration is such that the address of the monitoring slave station 10 is added. By doing this,
The data transmitted from the monitoring slave station 10 is transmitted to the monitoring slave station 1
The monitoring relay station 20 to which “0” is assigned can be accurately received. The transmission data includes a plurality of continuous state data to which the measurement time is added. As shown in FIG. 6, the format of the data transmitted from the monitoring relay station 20 to the monitoring slave station 10 includes, in the control data, the address of the monitoring slave station 10 to which the control data is to be transmitted and the address of the monitoring relay station 20. The address and the address are added. In this way, the data transmitted from the monitoring relay station 20 can be accurately received by the monitoring slave station 10 that should receive the data.

Next, the format of data transmitted and received between the monitoring relay station 20 and the monitoring parent station 30 will be described.
FIG. 7 is a diagram showing a format of data transmitted from the monitoring relay station 20 to the monitoring parent station 30. As described above, transmission and reception of data between the monitoring relay station 20 and the monitoring parent station 30 are performed via a telephone line using PHS communication.

As shown in FIG. 7, the format of the data transmitted from the monitoring relay station 20 to the monitoring parent station 30 is such that the address of the monitoring relay station 20 is added to the transmission data. The transmission data has a configuration in which the address of the monitoring slave station 10 is added to the status data measured by each monitoring slave station 10. The data transmitted from the monitoring parent station 30 to the monitoring relay station 20 is basically the same as that shown in FIG.

Next, the operation of this embodiment will be described with reference to the drawings.

First, the monitoring operation of the distribution network 40 in a normal state will be described. Here, the normal time refers to a case where the status data of each monitoring slave station 10 is collected by the monitoring master station 30 according to a status data transmission request transmitted from the monitoring parent station 30 periodically or at the request of the operator. Operation.

FIG. 8 is a flow chart for explaining the monitoring operation of the distribution network in the normal state of the first embodiment of the present invention.

In the monitoring parent station 30, first, the telephone 31 is used to dial the PHS terminal 23 of the monitoring relay station 20 (step 101).
2), retry after a certain period of time (step 10)
3). Next, a status data transmission request is transferred to the dialed monitoring relay station 20 (step 104), and the monitoring relay station 20 waits for status data to be sent. When the status data is received from the monitoring relay station 20 (step 10)
5) The data is stored in the data storage unit 32 (step 106). Next, the control unit 34 determines whether or not status data has been sent from all the monitoring relay stations 20 (step 107). When the status data is sent from all the monitoring relay stations 20, the load status of the distribution network 40 is determined based on the status data stored in the data storage unit 32, and the distribution line load is efficiently distributed. The opening / closing state of each switch 50 that can be performed is estimated (step 108). On the other hand, if the status data has not been sent from all the monitoring relay stations 20, the processing of steps 101 to 107 is repeated until the status data has been sent from all the monitoring relay stations 20.

In the monitoring relay station 20, when the PHS terminal 23 receives a transmission request from the monitoring master station 30 (step 20).
1) The wireless communication unit 21 transmits a status data transmission request to the monitoring slave station 10 previously assigned to the monitoring relay station 20 (step 202), and the transmission request is transmitted from the monitoring slave station 10 that has transmitted the transmission request. Wait for a response.
If no transmission request response has been sent (step 20)
3) Retry until a transmission request response is sent (step 204). Next, the status data transmitted from the monitoring slave station 10 that has transmitted the transmission request is received by the wireless communication unit 21, and the status data is stored in the data storage unit 22 (step 205). It waits for transmission completion from the monitoring slave station 10 (step 206). Next, the control unit 24 determines whether or not status data has been received from all monitoring slave stations 10 assigned to the monitoring relay station 20 (step 2).
07). When the status data has been received from all assigned monitoring slave stations 10, the process proceeds to step 208. On the other hand, if it has not been received, the processing of steps 202 to 206 is repeated until status data is received from all assigned monitoring child stations 10. In step 208, the telephone 31 of the monitoring parent station 30 is dialed using the PHS terminal 23. If the connection is not made (step 209), a retry is performed after a certain time has elapsed (step 210). Thereafter, the status data of all the monitoring slave stations 10 previously allocated to the monitoring relay station 20 and stored in the data storage unit 22 is transferred to the monitoring master station using the telephone line (step 211).

In the monitoring slave station 10, the measuring unit 11 measures the state of the distribution line at the position where the monitoring slave station 10 is installed, and obtains status data (step 301). Then, the acquired situation data is stored in the data storage unit 12 (step 302). Next, the control unit 14 determines whether a transmission request has been sent from the monitoring relay station 20 to which the monitoring slave station 10 has been assigned (step 303).
If it has not been sent back to step 301,
After a certain period of time, status data is acquired again. On the other hand, if a transmission request has been sent, the wireless communication unit 13 transmits a transmission request response to the monitoring relay station 20 to which the monitoring slave station 10 has been assigned (step 304). The accumulated status data is transmitted to the monitoring relay station 20 (step 305). Then, after the transmission of the status data is completed, a transmission completion signal is transmitted (step 306).

Next, the operation of monitoring the distribution network 40 in an emergency will be described. Here, the term “emergency” refers to an operation when the situation data acquired by the monitoring slave station 10 is data indicating an abnormality (for example, a power failure or the like) of the distribution network 40 (hereinafter, referred to as emergency situation data).

FIG. 9 is a flowchart for explaining the operation of monitoring the distribution network in an emergency according to the first embodiment of the present invention.

In the monitoring slave station 10, step 3 shown in FIG.
If the status data acquired in step S01 is emergency status data (step 321), the wireless communication unit 13 transmits a request for receiving emergency status data to the monitoring relay station 20 to which the monitoring slave station 10 is assigned (step 322). ), And waits for a reception request response from the monitoring relay station 20 (step 323). If a reception request response has not been sent, a retry is performed after a predetermined time has elapsed (step 32).
4). Next, the wireless communication unit 13 transmits the acquired emergency situation data to the monitoring relay station 20 to which the monitoring slave station 10 is assigned (Step 325). Then, after the transmission of the emergency situation data is completed, a transmission completion signal is transmitted (step 326).

In the monitoring relay station 20 to which the monitoring slave station 10 that has acquired the emergency situation data is assigned, when the wireless communication unit 21 receives a request to receive emergency situation data from the monitoring slave station 10 (step 221), A reception request response is transmitted to the monitoring slave station 10 (step 222). Next, the emergency situation data is received from the monitoring slave station 10 and stored in the data storage unit 22 (step 223). Thereafter, it waits for transmission completion from the monitoring slave station 10 (step 224). . Next, the telephone 31 of the monitoring parent station 30 is dialed using the PHS terminal 23 (step 22).
5). If the connection is not made (step 226), a retry is performed after a certain time has elapsed (step 227). Thereafter, the emergency situation data stored in the data storage unit 22 is transferred to the monitoring master station using the telephone line (step 228).

When the monitoring master station 30 receives the emergency situation data from the monitoring relay station 20 (step 121), it stores this data in the data storage unit 32 (step 122).
Thereafter, the load status of the distribution network 40 is determined based on the emergency status data, and the switching status of each switch 50 that can efficiently distribute the distribution line load is estimated (step 123).

As described above, in the normal case, the monitoring relay station 20 collectively transfers the status data acquired by all the monitoring slave stations 10 assigned to the monitoring relay station 20 to the monitoring parent station 30. I do. On the other hand, in the case of an emergency, only the emergency situation data is transferred to the monitoring parent station 30. Note that, when the flow of the normal monitoring operation shown in FIG. 8 is being executed and the emergency situation data is acquired by a certain monitoring slave station 10, the flow shown in FIG. 9 is prioritized.

FIG. 10 shows a monitoring relay station 20, a plurality of monitoring slave stations 10 assigned to the monitoring relay station 20,
FIG. 4 is a timing chart showing how status data measured by each of a plurality of monitoring slave stations 10 is transmitted to the monitoring master station 30 with the monitoring master station 30. Here, it is assumed that a plurality of monitoring slave stations assigned to a certain monitoring relay station a are configured in the order of 1 to n. The monitoring relay station a
In response to a command from the monitoring master station, the transmission request is sequentially output to the plurality of monitoring slave stations 1 to n assigned to the monitoring relay station a, and the monitoring request is sent from the monitoring slave station to which the transmission request is output. The status data stored in the data storage unit 12 of the slave station is received. When the status data is received from all of the monitoring child stations 1 to n, the status data of the monitoring child stations 1 to n is collectively transferred to the monitoring parent station. When receiving the status data of all the monitoring slave stations assigned to the monitoring relay station a via the monitoring relay station a, the monitoring master station issues a command to the other monitoring relay stations, and The monitoring relay station receives status data of all monitoring slave stations assigned to the monitoring relay station. By repeating the above operation, status data is collected from all monitoring slave stations.

FIG. 11 is a timing chart of data transmission when emergency status data is acquired by a certain monitoring slave station during the data transmission shown in FIG. Here, FIG. 10 shows the timing of data transmission when the monitoring slave station 2 acquires emergency status data while the monitoring slave station 2 is transmitting status data to the monitoring relay station a. In this case, the monitoring slave station 2 interrupts the transmission of the current status data and transmits the emergency status data to the monitoring relay station a.
Send to The monitoring relay station a immediately transfers the emergency situation data sent from the monitoring slave station 2 to the monitoring master station. This makes it possible to immediately respond to an urgent case such as a distribution line accident.

Next, the control operation of the switch 50 of the present embodiment will be described.

FIG. 12 is a flowchart for explaining the control operation of the switch according to the first embodiment of the present invention.

The monitoring parent station 30 first determines whether or not there is a switch 50 whose opening / closing state needs to be changed based on the opening / closing state of each switch 50 estimated by the determining unit 33 (step 141). ). If there is a switch 50 whose switching state needs to be changed, the control unit 34 extracts the monitoring slave station 10 installed together with the switch 50 whose switching state needs to be changed (step 142). Then, the user uses the telephone 31 to dial the monitoring relay station 20 to which the extracted monitoring slave station 10 is assigned (step 143). If the connection is not made (step 144), a retry is performed after a certain time has elapsed (step 145). Next, a control command to change the open / close state of the switch 50 is transmitted to the dialed monitoring relay station 20 (step 813).

In the monitoring relay station 20, when the control command sent from the monitoring master station 30 is received by the PHS terminal 23 (step 241), the control unit 24 sends the control command to the monitoring slave station 10 specified by the control command. Then, a control command to change the open / closed state of the switch 50 is transmitted using the wireless communication unit 21 (step 242).

The monitoring slave station 10 that has received the control command (step 341) is controlled by the control unit 24.
A control signal corresponding to the received control command is output to the switch 50 installed together with the control command (step 342). In response to this, the switch 50 changes the open / closed state.

In the first embodiment of the present invention, a wireless communication system is used for transmitting and receiving data between the monitoring relay station and the monitoring slave station, and a telephone line using PHS communication for transmitting and receiving data between the monitoring relay station and the monitoring slave station. We use net. Therefore, according to the present embodiment, the monitoring of the distribution network and the remote control of the switch can be performed without extending a dedicated communication line along the distribution network. This can reduce the cost of introducing the distribution line monitoring system.

Further, in the first embodiment of the present invention, a plurality of monitoring slave stations respectively installed at arbitrary positions of the distribution network are divided into a plurality of groups, and one monitoring relay station is assigned to each group. I have. Then, at the monitoring relay station, after collecting the status data obtained by all monitoring slave stations belonging to the group to which the monitoring relay station is assigned, the status data is monitored using a telephone line using PHS communication. Transferred to master station. In this way, the situation data acquired by the monitoring slave station is not directly transferred to the monitoring master station via the telephone network, but is collected once by the monitoring relay station and then transmitted from the monitoring relay station using the telephone network. By transferring the data to the monitoring parent station, communication congestion on the telephone line due to data transfer can be reduced.

In the first embodiment of the present invention, it has been described that the monitoring relay station 20 needs to be installed in the wireless zone of the PHS base station 60. However, when the monitoring relay station 20 cannot be installed in the wireless zone of the PHS base station 60, Is a PHS as shown in FIG.
A monitoring auxiliary relay station 70 having a PHS terminal installed therein is installed in the wireless zone of the base station 60, the monitoring relay station 20 is connected to the monitoring auxiliary relay station 70 via a communication line 80, and the status data collected by the monitoring relay station 20 PHS installed in the monitoring auxiliary relay station 70
You may make it transmit from a terminal.

In the first embodiment of the present invention, as the monitoring operation at the normal time, the monitoring slave station 10 receives the transmission request from the monitoring master station 30 and responds to the status data stored in the data storage unit 12. Although the transmission to the monitoring relay station 20 has been described, for example, when the monitoring slave station 10 stores the status data for a predetermined time, the monitoring slave station 10 automatically stores the status data in the data storage unit 12. Relay station that monitors data 2
0 may be transmitted.

Next, a second embodiment of the present invention will be described with reference to the drawings.

The distribution line monitoring system of the present embodiment is shown in FIG.
Is added to the distribution line monitoring system of the first embodiment shown in (1), the function of assigning monitoring slave stations to monitoring relay stations, that is, the function of grouping monitoring slave stations. The monitoring slave station and the monitoring relay station for realizing this function are shown in FIGS.
It is shown in FIG. FIG. 14 is a schematic block diagram of a monitoring slave station used in the second embodiment of the present invention, and FIG. 15 is a schematic block diagram of a monitoring relay station used in the second embodiment of the present invention. In the present embodiment, components having the same functions as those in the first embodiment of the present invention are denoted by the same reference numerals, and detailed description thereof will be omitted. The schematic configuration diagram of the distribution line monitoring system of the present embodiment is the same as that of the first embodiment shown in FIG.

As shown in FIG. 14, the monitoring slave station 10a of this embodiment includes a measuring unit 11, a data storage unit 12, a radio communication unit 13, a control unit 14, and a GPS (Global Positio).
ningSystem) GPS receiver 1 for receiving radio waves from satellites
5 and a position calculator 16 for calculating the time and the position (latitude, longitude) of the monitoring slave station 10a on the ground based on the radio waves from the GPS satellites received by the GPS receiver 15.

The monitoring relay station 20a according to the present embodiment is configured as shown in FIG.
As shown in the figure, the wireless communication unit 21 and the data storage unit 22
, A PHS terminal 23, a control unit 24, a GPS receiving unit 25 for receiving radio waves from GPS satellites, and a GPS receiving unit 2
5, a position calculation unit 26 for obtaining the time and the position (latitude and longitude) of the monitoring relay station 20a on the ground based on the radio wave from the GPS satellite received in step 5, and the monitoring relay station 20a calculated by the position calculation unit 26. Of the monitoring relay station 20a and the monitoring slave station 10a based on the position of the monitoring slave station 10a and the information indicating the position of the monitoring slave station 10a transmitted from the monitoring slave station 10a. And

Next, the operation of the present embodiment when determining the assignment destination of the newly established monitoring slave station 10a to the monitoring relay station 20a will be described.

FIG. 16 is a flowchart for explaining the operation for determining the assignment destination of the newly established monitoring slave station to the monitoring relay station.

When a monitoring slave station 10a is newly established at a certain point, the monitoring master station 30 instructs a certain monitoring relay station 20a to poll the newly monitoring slave station 10a by using a telephone line. Is issued (step 161). next,
It is determined whether or not the monitoring relay station 20a that has issued the command has succeeded in polling (step 162). This determination is made based on a signal from the monitoring relay station 20a that has issued the command. If the monitoring relay station 20a that has issued the command succeeds in polling, the data transmitted from the monitoring relay station 20a and relating to the distance between the monitoring relay station 20a and the newly installed monitoring slave station 10a is stored in the data storage unit 32. (Step 16
3). On the other hand, if the monitoring relay station 20a that has issued the command fails in polling, the process returns to step 161 and issues a command to the next monitoring relay station 20a to poll the newly installed monitoring slave station 10a. In step 164, it is determined whether or not a command has been issued to all the monitoring relay stations 20a to perform polling. When a command is issued to perform polling for all the monitoring relay stations 20a,
From the data storage unit 32, the monitoring relay station 2 in which the distance between the newly installed monitoring slave station 10a and the monitoring relay station 20a is the shortest.
0a is extracted (step 165).
a to be assigned a new monitoring slave station 10a,
The monitoring relay station 20a and the newly installed monitoring slave station 10a are notified of this (step 166). On the other hand, when the command to perform polling has not been issued to all the monitoring relay stations 20a, the process returns to step 161.

The monitoring relay station 20a that has received the polling command from the monitoring parent station 30 polls the newly installed monitoring slave station 10a (step 261). Step 26
In 2, if there is no response to the polling from the newly established monitoring slave station 10 a, the monitoring parent station 30 is notified that the polling has failed (step 263). If there is a response, the process proceeds to step 264. In step 264, the newly established monitoring relay station 10a is sent based on the position information of the monitoring relay station 10a sent together with the response to the polling and the position information of the monitoring relay station 20a calculated using the GPS. The distance between the monitoring slave station 10a and the monitoring relay station 20a is calculated. After that, information about the calculated distance is notified to the monitoring parent station 30 (step 26).
5).

In the newly established monitoring slave station 10a, the monitoring relay station 2
When the polling signal sent from 0a is received (step 361). A response signal is transmitted to the monitoring relay station 20a that has transmitted the polling signal (step 36).
2). At this time, position information of the monitoring slave station 10a calculated using GPS is added to the response signal and transmitted.

In this embodiment, when the monitoring slave station 10a is newly installed, the newly installed monitoring relay station 0a and each monitoring relay station 0a are determined based on the position information of the monitoring slave station 10a and the monitoring relay station 20a obtained by using the GPS. The distance to the relay station 20a is calculated, and the newly installed monitoring child station 10a is allocated to the monitoring relay station 20a having the shortest distance from the newly installed monitoring child station 10a and the receivable monitoring relay station 20a. I have. In this way, the newly installed monitoring slave station 1 is assigned to the most suitable monitoring relay station 20a.
0a can be automatically assigned.

According to the present embodiment, the monitoring slave station 10
a and the monitoring relay station 20a can obtain information on the time by using radio waves transmitted from the GPS satellites, so that it is not necessary to provide a high-accuracy time counter in each station.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the invention. For example, in each of the above-described embodiments, a case has been described in which a telephone line using PHS communication is used for data transmission between the monitoring master station and the monitoring relay station. However, the present invention is not limited to this. For example, instead of providing a PHS terminal in the monitoring relay station, a mobile phone terminal may be provided and wireless communication by the mobile phone may be used. If a telephone line is drawn at the installation location of the monitoring relay station, a normal telephone may be provided instead of providing the PHS terminal at the monitoring relay station.

Further, in each of the above-described embodiments, the case where wireless communication is used for data transmission between the monitoring relay station and the monitoring slave station has been described. However, this wireless communication may be PHS communication or wireless communication using a mobile phone. A telephone line may be used. Also, if a telephone line such as PHS communication or wireless communication using a mobile phone can be used for data transmission from the monitoring slave station,
The monitoring master station and the monitoring slave station may directly exchange data without providing a monitoring relay station.

[0056]

As described above, according to the present invention,
It is possible to efficiently collect distribution line status data without drawing a dedicated communication line along a distribution line network stretched like a tree.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a distribution line monitoring system according to a first embodiment of the present invention.

FIG. 2 is a schematic block diagram of a monitoring slave station shown in FIG.

FIG. 3 is a schematic block diagram of the monitoring relay station shown in FIG. 1;

FIG. 4 is a schematic block diagram of a monitoring parent station shown in FIG. 1;

FIG. 5 is a diagram showing a format of data transmitted from a monitoring slave station to a monitoring relay station.

FIG. 6 is a diagram showing a format of data transmitted from a monitoring relay station to a monitoring slave station.

FIG. 7 is a diagram showing a format of data transmitted from the monitoring relay station to the monitoring parent station.

FIG. 8 is a flowchart illustrating a monitoring operation of the distribution network in a normal state according to the first embodiment of the present invention.

FIG. 9 is a flowchart for explaining the operation of monitoring the distribution network in an emergency according to the first embodiment of the present invention.

FIG. 10 shows how a monitoring relay station, a plurality of monitoring slave stations assigned to the monitoring relay station, and a monitoring master station change status data measured by each of the monitoring slave stations. It is a timing diagram showing whether it is transmitted to the station.

11 is a timing chart of data transmission when emergency status data is acquired by a certain monitoring slave station while the data transmission shown in FIG. 10 is being performed.

FIG. 12 is a flowchart illustrating a control operation of the switch according to the first embodiment of the present invention.

FIG. 13 is a diagram for explaining a modification of the first embodiment of the present invention.

FIG. 14 is a schematic block diagram of a monitoring slave station used in the second embodiment of the present invention.

FIG. 15 is a schematic block diagram of a monitoring relay station used in the second embodiment of the present invention.

FIG. 16 is a flowchart for explaining an operation when determining an assignment destination of a newly established monitoring slave station to a monitoring relay station.

[Explanation of symbols]

 10, 10a monitoring slave station 11 measuring unit 12, 22, 32 data storage unit 13, 21, wireless communication unit 14, 24, 34 control unit 15, 25 GPS receiving unit 16, 26 position calculating unit 20, 20a monitoring relay station 23 PHS Terminal 27 Distance calculation unit between slave stations 30 Monitoring master station 31 Telephone 33 Judgment unit 40 Distribution network 50 Switch 60 PHS base station

Claims (5)

[Claims] Claims: 1. An electric vehicle, comprising:
A plurality of monitoring slave stations that measure data indicating a load situation at the position of the distribution network, and a monitoring master station that monitors the distribution network based on data measured by the plurality of monitoring slave stations. The plurality of monitoring slave stations transmits measured data to the monitoring master station via a wireless transmission path, and the monitoring master station transmits the measured data from the plurality of monitoring slave stations to the monitoring master station. A distribution line monitoring system for receiving data transmitted via a line via a telephone network connected to the wireless transmission line. 2. The monitoring relay station according to claim 1, further comprising a plurality of monitoring relay stations each assigned at least one of said monitoring slave stations, wherein said monitoring slave station allocates measured data to said monitoring slave station. The monitoring relay station has a transmission unit that wirelessly transmits, the monitoring relay station receives a data transmitted from the monitoring slave station assigned to the monitoring relay station,
A wireless communication terminal that transfers the data received by the receiving unit to the monitoring master station via a wireless communication network, wherein the monitoring master station transmits the data from the plurality of monitoring relay stations via a wireless communication network. A distribution line monitoring system comprising a telephone set for receiving the transferred data via a telephone network connected to the wireless communication network. 3. The distribution line monitoring system according to claim 2, wherein the transmission unit and the reception unit are wireless communication terminals that transmit data via a wireless communication network. 4. The slave station according to claim 2, further comprising: a slave station position measuring section for measuring data indicating an installation position of the monitor slave station, wherein the slave section position measuring section is controlled by the transmitting section. Transmitting the data measured in the plurality of monitoring relay stations, the monitoring relay station, a relay station position measurement unit that measures data indicating the installation position of the monitoring relay station, the relay station position measurement unit The distance between the monitoring relay station and the monitoring slave station based on the data indicating the installation position of the monitoring relay station measured in the above and the data indicating the installation position of the monitoring relay station sent from the monitoring slave station. And a distance calculating unit for calculating data indicating the data, and transmitting the data calculated by the distance calculating unit to the monitoring master station by the wireless communication terminal, wherein the monitoring master station includes the plurality of monitoring relays. The surveillance sent from the station Based on the data indicating the distance between Tsugikyoku and the monitoring slave station, distribution line monitoring system characterized in that it has a decision unit that determines the monitoring relay stations the monitoring slave station is assigned. 5. The monitoring station according to claim 2, wherein each of the plurality of monitoring stations is provided.
It has a plurality of switches for changing the connection state of the distribution network, the monitoring master station has a detection unit that detects a switch that needs to change the operation state based on the monitoring result of the distribution network. ,
The telephone transmits a control command for the switch to a monitoring relay station to which a monitoring slave station corresponding to the switch detected by the detection unit is assigned. A control command transmitting unit that wirelessly transmits a control command of a switch provided corresponding to the monitoring slave station assigned to the monitoring relay station sent from the station to the monitoring slave station. A control command receiving unit that receives a control command sent from a monitoring relay station to which the monitor slave station is assigned; and a control command receiving unit that receives the control command from the control command receiving unit. And a switch control unit for controlling a switch provided corresponding to the station.