WO2020021802A1

WO2020021802A1 - Monitoring device

Info

Publication number: WO2020021802A1
Application number: PCT/JP2019/017616
Authority: WO
Inventors: 丸山剛史; 小嶋隆夫; 黒岩聡; 岩間成美; 酒井治
Original assignee: 住友電気工業株式会社
Priority date: 2018-07-25
Filing date: 2019-04-25
Publication date: 2020-01-30
Also published as: JPWO2020021802A1; JP7173146B2

Abstract

This monitoring device is used for a power system, and is provided with: a communication unit that operates upon receiving power supply from a battery, and transfers information; a time synchronization unit that operates upon receiving power supply from the battery, and performs a synchronization process for obtaining time synchronization with another monitoring device; and a power source control unit that operates upon receiving power supply from the battery, and controls start and stop of power supply to the communication unit. The power source control unit regularly performs first power source control to start power supply to the communication unit and stop the power supply after the elapse of a first prescribed time period.

Description

Monitoring device

The present invention relates to a monitoring device.
This application claims priority based on Japanese Patent Application No. 2018-139457 filed on Jul. 25, 2018, the entire disclosure of which is incorporated herein.

As an example of a network system, for example, Japanese Patent No. 6046480 (Patent Document 1) discloses the following configuration.

That is, the network system installs a radio station on each of the towers on which the power transmission lines are erected, and connects a master station connectable to an external communication line to at least one of the radio stations to connect these radio stations. Along the tower column, information can be sequentially relayed bidirectionally from the wireless station to the master station or from the master station to the wireless station, and the wireless station can be relayed from one side of the tower row. A first communication memory for storing the transmitted information, and a second communication memory for storing the information transmitted from the other side of the tower array; A transmission tower maintenance information wireless network system that relays the information stored in the communication memory to the other side and relays the information stored in the second communication memory to the one side. An identification number is individually assigned, and the source of the information The radio station transmits the information with the identification number of the radio station attached thereto, and the master station assigns the identification number of the radio station and the tower provided with the radio station. A plurality of transmission lines are connected to the tower, and a plurality of tower numbers corresponding to each transmission line are assigned to the same tower. Then, based on the identification number conversion table, the master station converts the identification number of the wireless station that transmitted the information into a plurality of tower numbers corresponding to each of the transmission lines. The master station communicates with an upper-level host station via an external communication line such as a mobile phone line.

Japanese Patent No. 6046480

(1) A monitoring device according to the present disclosure is a monitoring device used in a power system, and operates by receiving power supply from a battery, and operates by receiving a communication unit that transfers information, and receiving power supply from a battery. A time synchronization unit that performs a synchronization process for time synchronization with the other monitoring devices, and a power control unit that operates by receiving power supply from a battery and controls start and stop of power supply to the communication unit. And the power supply control unit periodically performs first power supply control to start power supply to the communication unit and to stop the power supply after a first predetermined time has elapsed.

One embodiment of the present disclosure can be realized not only as a monitoring device including such a characteristic processing unit, but also as a monitoring method having such characteristic processing as a step, or executing such a step on a computer. The program can be realized as a program for causing Further, one embodiment of the present disclosure can be realized as a semiconductor integrated circuit that realizes part or all of the monitoring device, or can be realized as a monitoring system including the monitoring device.

FIG. 1 is a diagram illustrating a configuration of a monitoring system according to the first embodiment of the present invention. FIG. 2 is a diagram illustrating a configuration of the monitoring device according to the first embodiment of the present invention. FIG. 3 is a flowchart that defines an operation procedure in the power saving mode by the monitoring device according to the first embodiment of the present invention. FIG. 4 is a sequence that defines an operation procedure in the event occurrence mode by the monitoring system according to the first embodiment of the present invention. FIG. 5 is a diagram illustrating a configuration of a monitoring device according to a modification of the first embodiment of the present invention. FIG. 6 is a flowchart that defines an operation procedure of power supply control by the monitoring device according to the second embodiment of the present invention.

[Problems to be solved by the present disclosure]
For example, if a monitoring device that monitors power lines in a power system is installed on a steel tower, mounting a photovoltaic power generation device as a power source would cost a lot of money, and supplying power from the transmission line to the monitoring device would be difficult. Have difficulty.

For this reason, it is conceivable to install a battery in the monitoring device. In order to reduce the frequency of battery replacement, a technique that can effectively reduce the power consumption of the monitoring device is desired.

The present disclosure has been made in order to solve the above-described problem, and an object of the present disclosure is to provide a monitoring device used in a power system, which can effectively reduce power consumption. .

[Effects of the present disclosure]
According to the present disclosure, a monitoring device used in a power system can effectively reduce power consumption.

[Description of Embodiment of the Present Invention]
First, the contents of the embodiment of the present invention will be listed and described.

(1) A monitoring device according to an embodiment of the present invention is a monitoring device used in a power system, which operates by receiving power supply from a battery and transfers information, and a power supply from the battery. A time synchronizing unit that operates upon receiving and performs a synchronization process for time synchronizing with the other monitoring devices, and operates upon receiving power supply from a battery and controls start and stop of power supply to the communication unit. A power control unit that starts power supply to the communication unit and periodically performs a first power supply control to stop the power supply after a first predetermined time has elapsed.

(4) With such a configuration in which the control for stopping the power supply to the wireless communication unit is performed, a large amount of power consumption can be suppressed as compared with, for example, a case of operating in a sleep mode requiring standby power. In addition, since the power supply period to the wireless communication unit can be matched between a plurality of monitoring devices that have established time synchronization with each other, the power supply period to the wireless communication unit in each monitoring device is secured wastefully. And information from each monitoring device can reach an external device. Therefore, in the monitoring device used for the power system, power consumption can be effectively suppressed.

(2) Preferably, the monitoring device further includes a sensor that operates by receiving power supply from a battery and outputs measurement information indicating a measurement result as the information, or is connected to the sensor, and A control unit that controls start and stop of power supply to the sensor, wherein the power control unit starts power supply to the sensor, and stops the power supply after a second predetermined time has elapsed. Perform power control.

構成 Thus, by performing the control for stopping the power supply to the sensor, the power consumption can be more effectively suppressed.

(3) More preferably, the power control unit performs the second power control during part or all of a period during which power is supplied to the communication unit by the first power control.

With this configuration, it is possible to transmit measurement information indicating the measurement result of the sensor in real time.

(4) Preferably, the monitoring device further includes a sensor that operates by receiving power supply from a battery and outputs measurement information indicating a measurement result as the information, or is connected to the sensor, and When the communication unit receives the predetermined information, the control unit stops the first power supply control, continuously supplies power to the communication unit, and supplies power to the sensor at a time based on the predetermined information. Control to start supply is performed.

(4) With such a configuration, in a situation where the need for measurement results by the sensor is high, such as when a lightning strike is expected, power supply to the sensor can be started at an appropriate timing.

(5) More preferably, the power supply control unit performs control to stop power supply to the wireless communication unit and the sensor at a time based on the predetermined information, and restarts the first power supply control.

With such a configuration, in a situation where the necessity of the measurement result by the sensor is reduced, for example, when a period in which a lightning strike is expected has elapsed, the power supply to the sensor is stopped at an appropriate timing, and the power consumption is reduced again. It can be suppressed effectively.

(6) Preferably, it is possible to perform power supply control on the time synchronization unit separately from the power supply control unit, and the power supply control unit transmits the power to the wireless communication unit by the first power supply control. In a period during which power is supplied, control is performed to start power supply to the time synchronization unit, and to stop power supply to the time synchronization unit when the synchronization process ends.

(4) With such a configuration in which the power supply to the time synchronization unit is controlled to be stopped in a period other than the period in which the synchronization process is performed by the time synchronization unit, power consumption can be more effectively suppressed.

(7) More preferably, the monitoring device further includes a holding unit that holds a synchronization processing time at which the synchronization processing is performed, and the power supply control unit is configured to determine whether a predetermined time has elapsed from the synchronization processing time. Control to start power supply to the time synchronization unit.

With this configuration, if the predetermined time has not elapsed since the previous synchronization processing, power supply to the time synchronization unit is not started, so that power consumption can be more effectively reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding portions have the same reference characters allotted, and description thereof will not be repeated. Further, at least some of the embodiments described below may be arbitrarily combined.

<First embodiment>
[Configuration and basic operation]
(Monitoring system)
FIG. 1 is a diagram illustrating a configuration of a monitoring system according to the first embodiment of the present invention.

Referring to FIG. 1, monitoring system 301 includes a plurality of monitoring devices 101, a collection device 151, and a management device 171.

The plurality of monitoring devices 101 are installed at different positions in the power system, for example, at a plurality of positions where information necessary for maintenance of the power system can be detected. Specifically, the plurality of monitoring devices 101 are provided in the plurality of steel towers 2 used for the power system, respectively. In addition, the collection device 151 is provided, for example, in a steel tower 2 a that is one of the plurality of steel towers 2. The pylon 2 is, for example, a power transmission pylon. Hereinafter, the direction from the monitoring device 101 to the management device 171 is referred to as “upward direction”, and the direction from the management device 171 to the monitoring device 101 is referred to as “downward direction”.

The monitoring device 101 has a function of transferring information. In this specification, “transfer” includes, for example, relaying information to a relay destination and transmitting information to a relay destination as a source of information.

Specifically, the monitoring apparatus 101 transmits, for example, information received by itself to another monitoring apparatus 101 different from the other monitoring apparatus 101 as “transfer”. Is transmitted to the other monitoring apparatus 101.

Specifically, each monitoring device 101 transmits, for example, information used for maintenance of a power system such as a power transmission facility. Specifically, for example, each monitoring device 101 measures the amount of charge in the overhead ground wire GW connected to the steel tower 2 provided with the monitoring device 101, and transmits measurement information indicating the measurement result.

More specifically, each monitoring device 101 includes a wireless signal including measurement information indicating a measurement result, including its own ID as a sender in accordance with, for example, the communication standard of IEEE802.15.4. A sensor packet that includes the ID of the monitoring device 101 of the above as a destination and includes measurement information is generated. Then, each monitoring device 101 transmits a 920 MHz band wireless signal including the generated sensor packet.

{Circle around (1)} Each monitoring device 101 transfers a sensor packet transmitted from another monitoring device 101. More specifically, each monitoring device 101 receives a wireless signal including a sensor packet from another monitoring device 101, acquires a sensor packet from the received wireless signal, includes the sensor packet in the wireless signal, and transmits another wireless signal that is adjacent to the other upstream device. It is transmitted to the monitoring device 101.

Here, the monitoring device 101 provided in the steel tower 2a transmits the generated wireless signal to the collection device 151. In addition, the monitoring device 101 receives a wireless signal including a sensor packet transmitted from another monitoring device 101, acquires a sensor packet from the received wireless signal, includes the sensor packet in the wireless signal, and transmits the wireless signal to the collection device 151.

Note that each monitoring apparatus 101 is not limited to a configuration in which a wireless signal is transmitted to another adjacent monitoring apparatus 101, and for example, transmits a wireless signal to another monitoring apparatus 101 adjacent to its own monitoring apparatus 101 in the upstream direction. May be sent.

The transmission route of the sensor packet may be automatically or manually changed when one or more monitoring devices 101 in the monitoring system 301 fail.

The collection device 151 transfers the plurality of sensor packets transmitted from the plurality of monitoring devices 101, respectively. More specifically, the collection device 151 receives a wireless signal including a sensor packet from the monitoring device 101 provided in the steel tower 2a, acquires the sensor packet from the received wireless signal, includes the sensor packet in the wireless signal, and sends the acquired signal to the management device 171. Send.

The management device 171 receives the sensor packet transmitted from the collection device 151, acquires the ID and measurement information of the monitoring device 101 of the sender from the received sensor packet, and compares the acquired measurement information with the ID of the monitoring device 101. Save in association.

(4) The management device 171 generates a packet in which various types of information are stored, and transmits a wireless signal including the generated packet to the collection device 151.

The collection device 151 transfers the packet transmitted from the management device 171. More specifically, the collection device 151 receives the wireless signal transmitted from the management device 171, acquires a packet from the received wireless signal, includes the packet in the wireless signal, and transmits the packet to the monitoring device 101 provided in the tower 2 a. .

監視 The monitoring device 101 provided in the tower 2a transfers the packet transmitted from the collection device 151. More specifically, the monitoring device 101 receives the wireless signal transmitted from the collection device 151, acquires a packet from the received wireless signal, includes the packet in the wireless signal, and sends the packet to another monitoring device 101 adjacent in the downstream direction. Send.

Each monitoring device 101 transfers a packet transmitted from another monitoring device 101. More specifically, each monitoring device 101 receives a radio signal including a packet from another monitoring device 101, acquires a packet from the received radio signal, includes the packet in the radio signal, and transmits the other monitoring device adjacent to the other monitoring device 101 in the downlink direction. Send to 101.

When the received packet is addressed to itself, the collection device 151 and the monitoring device 101 process the packet without transferring it.

The monitoring device 101 is not limited to the tower 2 and may be installed around the tower 2. For example, the monitoring apparatus 101 may be installed on a transmission line, an overhead ground wire GW, or the ground.

(Monitoring device)
FIG. 2 is a diagram illustrating a configuration of the monitoring device according to the first embodiment of the present invention.

Referring to FIG. 2, monitoring device 101 includes wireless module 10, first power supply IC (Integrated Circuit) 11, second power supply IC 12, third power supply IC 13, battery 14, and RTC (Real Time Clock). 15, a sensor 16, and a time information receiving unit 17. The wireless module 10 includes a wireless communication unit 21, a time synchronization unit 22, and a power control unit 23.

The wireless module 10, the RTC 15, the sensor 16, and the time information receiving unit 17 operate using the electric power supplied from the battery 14.

The first power supply IC 11 includes, for example, a switch for switching a connection state between the wireless module 10 and the battery 14. Second power supply IC 12 includes, for example, a switch for switching a connection state between sensor 16 and battery 14. Third power supply IC 13 includes, for example, a switch for switching a connection state between time information receiving unit 17 and battery 14.

The sensor 16 outputs measurement information indicating a measurement result. Specifically, the sensor 16 measures, for example, the amount of charge in the overhead ground wire GW connected to the steel tower 2 provided with its own monitoring device 101, and outputs the measurement result to the wireless communication unit 21.

(4) The wireless communication unit 21 transfers information. The information transferred by the wireless communication unit 21 is, for example, measurement information indicating a measurement result of the sensor 16 that operates by receiving power supply from the battery 14 or measurement information received from another monitoring device 101.

Specifically, for example, the wireless communication unit 21 generates a wireless signal including measurement information indicating the measurement result output from the sensor 16 and transmits the generated wireless signal via one or more other monitoring devices 101. To the collection device 151.

In addition, the wireless communication unit 21 receives a wireless signal including measurement information transmitted from another monitoring device 101, and transmits the received wireless signal to the collection device 151 via one or more other monitoring devices 101. Send. Note that the wireless communication unit 21 in the monitoring device 101 provided in the tower 2a transmits a wireless signal including measurement information to the collection device 151.

The time information receiving unit 17 receives, for example, standard time information transmitted from a GPS (Global Positioning System) satellite or a standard radio wave from a standard radio wave transmitting station, and outputs the received standard time information to the time synchronizing unit 22. . Note that the time information receiving unit 17 may receive time information transmitted from another monitoring apparatus 101 instead of the standard time information.

The time synchronization unit 22 receives the standard time information output from the time information reception unit 17, and performs a synchronization process of adjusting the time of the RTC 15 using the standard time information. The time synchronization unit 22 in each monitoring device 101 performs the synchronization process of the corresponding RTC 15, so that the time of the RTC 15 is synchronized between the plurality of monitoring devices 101.

(4) The power control unit 23 controls the monitoring device 101 to operate in the power saving mode in the normal state. More specifically, the power supply control unit 23 periodically starts the first power supply control for starting the power supply to the wireless communication unit 21 and stopping the power supply to the wireless communication unit 21 after the first predetermined time has elapsed. Do.

Specifically, the power control unit 23 sets a start time of power supply to the wireless module 10 (hereinafter, also referred to as a “start time”) in the RTC 15. Then, the RTC 15 outputs a control signal to the first power supply IC 11 at the activation time set by the power supply control unit 23. The first power supply IC 11 receives the control signal output from the RTC 15 and starts supplying power to the wireless module 10 by connecting the battery 14 and the wireless module 10.

(4) After a predetermined time has elapsed from the start time, the power control unit 23 outputs a control signal to the first power supply IC 11. The first power supply IC 11 receives the control signal output from the power supply control unit 23 and stops the power supply to the wireless module 10 by disconnecting the connection between the battery 14 and the wireless module 10.

The power control unit 23 may be configured to set the end time of power supply to the wireless module 10 (hereinafter, also referred to as “stop time”) in the RTC 15. In this case, the RTC 15 controls the power supply to the wireless module 10 by outputting a control signal to the first power supply IC 11 at the stop time set by the power supply control unit 23.

The power control unit 23 is not limited to the configuration included in the wireless module 10, but may be included in the RTC 15, for example.

(4) The power control unit 23 controls start and stop of power supply to the time information receiving unit 17.

More specifically, the power supply control unit 23 outputs a control signal to the third power supply IC 13 during a period in which power is supplied to the wireless module 10, for example. The third power supply IC 13 receives the control signal output from the power supply control unit 23 and starts supplying power to the time information receiving unit 17 by connecting the battery 14 and the time information receiving unit 17. Further, the power control unit 23 outputs the control signal to the third power supply IC 13 after a lapse of a predetermined time from the timing of outputting the control signal to the third power supply IC 13. The third power supply IC 13 receives the control signal output from the power supply control unit 23 and disconnects the connection between the battery 14 and the time information receiving unit 17 to stop supplying power to the time information receiving unit 17.

(4) The power control unit 23 controls start and stop of power supply to the sensor 16. More specifically, when its own monitoring device 101 receives predetermined information described later, the power supply control unit 23 outputs a control signal to the second power supply IC 12 based on the predetermined information. The second power supply IC 12 receives the control signal output from the power supply control unit 23 and starts or stops power supply to the sensor 16 by switching the connection state between the battery 14 and the sensor 16.

Here, referring again to FIG. 1, when an event such as a lightning strike or a typhoon is expected, an external server (not shown) managed by the Meteorological Agency or the like transmits the event information to the management device 171. Here, as an example, a case will be described in which the external server transmits lightning information as event information to the management device 171 when a lightning strike is expected.

The lightning information indicates the area where lightning is expected and the period during which lightning is expected.

When the management apparatus 171 receives the lightning information transmitted from the external server, for example, the monitoring apparatus provided in the tower 2 farthest from the tower 2a among the plurality of monitoring apparatuses 101 included in the area indicated by the lightning information. (Hereinafter, this is also referred to as the “most end monitoring device.”) The predetermined information is transmitted to 101.

Specifically, the management device 171 receives, as the predetermined information, a startup notification request from the monitoring device 101, that is, a startup notification request for requesting a notification that the power supply to the wireless module 10 has been started in the monitoring device 101. Send.

When the extreme end monitoring device 101 and all the monitoring devices 101 located between the collection device 151 and the extreme end monitoring device 101 are activated, the start notification request transmitted from the management device 171 is transmitted to the extreme end monitoring device 101. To reach.

In this case, the extreme end monitoring apparatus 101 receives the start notification request from the management apparatus 171 and transmits a start completion notification to the management apparatus 171 via one or more other monitoring apparatuses 101 and the collection apparatus 151.

In this case, each of the monitoring devices 101 transitions from the power saving mode to the event occurrence mode.

That is, referring to FIG. 2 again, power supply control unit 23 in each monitoring device 101 stops first power supply control when wireless communication unit 21 in its own monitoring device 101 receives or transfers a start notification request. The power supply to the wireless communication unit 21 is continuously performed.

The activation notification request indicates, for example, a start time and an end time of power supply to the sensor 16 in each monitoring device 101. The start time and the end time of the power supply to the sensor 16 may be the same as or different from the start time and the end time indicated by the lightning information, respectively.

The power control unit 23 performs control to start supplying power to the sensor 16 based on, for example, a start time indicated by the start notification request. In addition, the power supply control unit 23 performs control to stop power supply to the sensor 16 based on, for example, an end time indicated by the activation notification request.

Note that the activation notification request may be information that does not indicate the start time and the end time of the power supply to the sensor 16. In this case, for example, the power supply control unit 23 performs control to start power supply to the sensor 16 after a lapse of a predetermined time from the activation time, and after a lapse of a second predetermined time from the start timing of power supply to the sensor 16, The second power control for stopping the power supply to the power supply is performed. The second predetermined time may be different from or the same as the first predetermined time.

In addition, for example, after transmitting the start notification request to the farthest monitoring device 101, if the management device 171 cannot receive the startup completion notification from the farthest monitoring device 101 within a predetermined time, the management device 171 notifies the farthest monitoring device 101 of the startup notification Resend the request.

Further, the management device 171 may be configured to multicast the start notification request to all of the extreme monitoring device 101 and one or a plurality of monitoring devices 101 located between the collection device 151 and the extreme monitoring device 101. Good. In such a configuration, when there is one or more monitoring apparatuses 101 that cannot transmit and receive information among the plurality of monitoring apparatuses 101, the management apparatus 171 repeatedly performs the multicast of the activation notification request.

In order to avoid such a state, each monitoring device 101 may transmit a start notification request to the monitoring devices 101 following the monitoring device 101 that cannot transmit and receive information in the downstream direction. In this case, among the plurality of monitoring apparatuses 101, one or more monitoring apparatuses 101 that have received the activation notification request transmit an activation completion notification to the management apparatus 171 and transition to the event occurrence mode.

Note that, compared to a configuration in which a plurality of monitoring devices 101 transmit a startup completion notification to the management device 171, a configuration in which only the extreme end monitoring device 101 transmits a startup completion notification to the management device 171 has a lower startup completion notification. This is preferable because transmission can be prevented from being duplicated.

起動 The activation notification request may further indicate an area where a lightning strike is expected. In this case, among the one or more monitoring devices 101 that transition to the event occurrence mode, the power supply control unit 23 in each of the one or more monitoring devices 101 that is not included in the area indicated by the activation notification request sends a signal to the sensor 16. A configuration in which start and stop of power supply are not controlled may be employed.

[Flow of operation]
Each device in the monitoring system 301 includes a computer including a memory, and an arithmetic processing unit such as a CPU in the computer reads and executes a program including a part or all of each step of the following flowcharts and sequences from the memory. . Each of the programs of the plurality of devices can be externally installed. The programs of the plurality of devices are distributed while being stored in a recording medium.

(Operation procedure in power saving mode)
FIG. 3 is a flowchart that defines an operation procedure in the power saving mode by the monitoring device according to the first embodiment of the present invention.

Referring to FIG. 3, first, RTC 15 performs control to start power supply to wireless module 10 by outputting a control signal to first power supply IC 11 at the start time set by power supply control unit 23. . Accordingly, the wireless communication unit 21, the time synchronization unit 22, and the power control unit 23 in the wireless module 10 receive the power supply from the battery 14, and the monitoring device 101 is entirely activated (step S11).

Next, the power control unit 23 sets the next start time in the RTC 15 (step S12). The interval at which the first power control is performed, that is, the time T1 from the previous start time to the next start time is 2 hours or the like, and the setting can be changed.

Next, the power supply control unit 23 performs control to start power supply to the time information receiving unit 17 by outputting a control signal to the third power supply IC 13 (step S13).

Next, the time information receiving unit 17 receives, for example, standard time information transmitted from a GPS satellite, and outputs the received standard time information to the time synchronizing unit 22 (step S14).

Next, the time synchronization unit 22 performs a synchronization process of the RTC 15 using the standard time information received from the time information reception unit 17 (Step S15).

Next, the power control unit 23 outputs a control signal to the third power supply IC 13 to perform control to stop power supply to the time information receiving unit 17 (step S16).

Next, the power control unit 23 outputs a control signal to the first power supply IC 11 to perform control to stop power supply to the wireless communication unit 21, that is, control to stop power supply to the wireless module 10 ( Step S17). A time T2 from the start to the stop of the power supply to the wireless module 10 is shorter than the time T1, for example, one minute. The power supply control unit 23 performs the first power supply control shown in steps S11 to S17 at a period of time T1.

The timing at which the next start time is set by the power supply control unit 23 (step S12) is not limited to immediately after the activation of the monitoring apparatus 101, but may be the timing included until the time T1 elapses from the activation of the monitoring apparatus 101. Should be fine.

In addition, the stop of the power supply to the time information receiving unit 17 by the power control unit 23 (step S16) and the stop of the power supply to the wireless communication unit 21 by the power control unit 23 (step S17) are performed in parallel. May be.

(Operation procedure in event occurrence mode)
FIG. 4 is a sequence that defines an operation procedure in the event occurrence mode by the monitoring system according to the first embodiment of the present invention.

Referring to FIG. 4, it is assumed here that monitoring devices 101A, 101B, and 101C are provided as three monitoring devices 101. It is assumed that these three monitoring devices 101A, 101B, and 101C are operating in the power saving mode before the start notification request is transmitted from the management device 171. That is, it is assumed that the monitoring apparatuses 101A, 101B, and 101C periodically perform the first power control, and time synchronization is established with each other (step S21).

Next, it is assumed that the management device 171 has received the lightning information transmitted from the external server (step S22). In this case, the management device 171 is, for example, the monitoring device 101A that is the endmost monitoring device provided at the position farthest from the collection device 151 among the monitoring devices 101A, 101B, and 101C included in the area indicated by the lightning information. , A start notification request is transmitted via the collection device 151 and the monitoring devices 101C and 101B.

At this time, it is assumed that the monitoring devices 101A, 101B, and 101C have not been activated at the transmission timing of the activation notification request from the management device 171. In this case, the monitoring device 101A cannot receive the activation notification request (Step S23).

Next, the RTC 15 in each of the monitoring devices 101A, 101B, and 101C outputs a control signal to the first power supply IC 11 at the activation time set by the corresponding power supply control unit 23, thereby supplying power to the wireless module 10. Is performed, and it is assumed that it has been started (step S24).

Next, the management device 171 transmits a start notification request to the monitoring device 101A again via the collection device 151 and the monitoring devices 101C and 101B. At this time, since the monitoring devices 101A, 101B, and 101C are all running, the monitoring device 101A can receive the startup notification request transmitted from the management device 171 (step S25).

Next, the power control unit 23 in each of the monitoring devices 101A, 101B, and 101C receives the notification that the activation notification request has been received or transferred from the wireless communication unit 21, and stops the first power control (step S26). .

Next, the power control unit 23 in each of the monitoring devices 101A, 101B, and 101C performs control to start power supply to the time information receiving unit 17 by outputting a control signal to the third power supply IC 13 (step S27). ).

Next, the time information receiving unit 17 in each of the monitoring devices 101A, 101B, and 101C receives the standard time information from the GPS satellites and outputs the received standard time information to the time synchronizing unit 22 (Step S28).

Next, the time synchronization unit 22 in each of the monitoring devices 101A, 101B, and 101C performs synchronization processing of the RTC 15 using the standard time information received from the time information reception unit 17 (Step S29).

(4) Since the time of the RTC 15 is synchronized between the monitoring devices 101A, 101B, and 101C, the start timing can be adjusted. In addition, since the start timing of each of the monitoring devices 101A, 101B, and 101C can be matched, each of the monitoring devices 101A, 101B, and 101C can be set without securing a long startup time for each of the monitoring devices 101A, 101B, and 101C. Since the measurement information transmitted from the communication device can be transmitted to the collection device 151, power saving can be further improved.

Next, the power control unit 23 in each of the monitoring devices 101A, 101B, and 101C performs control to stop the power supply to the time information receiving unit 17 by outputting a control signal to the third power supply IC 13 (step S30). ).

Next, the power supply control unit 23 in each of the monitoring devices 101A, 101B, and 101C sets, for example, a stop time, which is an end time of power supply to the wireless module 10, in the RTC 15 (step S31). The stop time is, for example, a time two hours after the start time.

Next, the power control unit 23 in each of the monitoring devices 101A, 101B, and 101C outputs a control signal to the second power supply IC 12 based on the time indicated by the activation notification request received by the wireless communication unit 21. Control for starting power supply to the sensor 16 is performed (step S32).

Next, the wireless communication unit 21 in the monitoring device 101A transmits a start completion notification to the management device 171 via the monitoring devices 101B and 101C and the collection device 151 (step S33).

Next, the sensor 16 in each of the monitoring devices 101A, 101B, and 101C measures the distribution of the charge amount on the overhead ground wire GW connected to the steel tower 2 provided with its own monitoring device 101, and wirelessly transmits the measurement result. Output to the communication unit 21. Then, the wireless communication unit 21 in each of the monitoring devices 101A, 101B, and 101C transmits a wireless signal including measurement information indicating the measurement result output from the corresponding sensor 16 to the management device 171.

Thereby, for example, the administrator of the management device 171 grasps the distribution of the charge amount on the overhead ground line GW based on the plurality of pieces of measurement information received by the management device 171 and receives a lightning strike to the overhead ground line GW. Presence / absence, and if there is a lightning strike, can estimate the location of the lightning strike.

The measurement by the monitoring devices 101A, 101B, and 101C and the transmission of the wireless signal including the measurement information are performed periodically or irregularly until the power supply to the sensor 16 is stopped (step S34).

Next, the power control unit 23 in each of the monitoring devices 101A, 101B, and 101C sets the next start time in the RTC 15 (step S35).

Next, power supply control unit 23 in each of monitoring apparatuses 101A, 101B, and 101C outputs a control signal to second power supply IC 12 based on the time indicated by the start notification request received by wireless communication unit 21, for example. Then, control for stopping the power supply to the sensor 16 is performed (step S36).

Next, the power supply control unit 23 in each of the monitoring devices 101A, 101B, and 101C outputs a control signal to the first power supply IC 11 to control the power supply to the wireless communication unit 21 to be stopped, that is, to the wireless module 10. The control for stopping the power supply is performed (step S37).

Next, the power control unit 23 in each monitoring device 101 restarts the first power control (step S38).

Note that the power supply control unit 23 may perform the stop of the power supply to the sensor 16 (step S36) and the stop of the power supply to the wireless communication unit 21 (step S37) in parallel.

(4) The external server transmits new lightning information to the management device 171 when, for example, an area and a period in which lightning is expected to change are changed.

When receiving the new lightning information transmitted from the external server, the management device 171 determines, for example, that the difference between the end time of the period indicated by the lightning information and the start time of the period indicated by the previously received lightning information is a predetermined time. Check if it exceeds. The predetermined time is, for example, 2 hours.

Then, when the difference exceeds the predetermined time, the management device 171 notifies the extreme end monitoring device 101 included in the area indicated by the new lightning information of a new activation via one or more monitoring devices 101 and the collection device 151. Submit the request. On the other hand, if the difference does not exceed the predetermined time, the management device 171 does not transmit a new activation notification request.

When the wireless communication unit 21 of the monitoring apparatus 101 of the monitoring apparatus 101 receives or transfers a new startup notification request transmitted from the management apparatus 171, for example, the power control unit 23 indicates the new startup notification request. Based on the time, control for stopping the power supply to the sensor 16 is performed.

By the way, for example, when a monitoring device that monitors electric power lines in a power system is installed in a steel tower, mounting a photovoltaic power generation device as a power source requires a lot of cost, and also supplies power from the transmission line to the monitoring device. It is difficult.

On the other hand, in the monitoring apparatus 101 according to the first embodiment of the present invention, the wireless communication unit 21 operates by receiving power supply from the battery 14 and transfers information. The time synchronization unit 22 operates by receiving power supply from the battery 14, and performs a synchronization process for time synchronization with another monitoring apparatus 101. The power supply control unit 23 operates by receiving power supply from the battery 14 and controls start and stop of power supply to the wireless communication unit 21. In addition, the power supply control unit 23 periodically performs first power supply control for starting power supply to the wireless communication unit 21 and stopping power supply after a first predetermined time has elapsed.

(4) With such a configuration in which the control for stopping the power supply to the wireless communication unit 21 is performed, much power consumption can be suppressed as compared with, for example, a case where the wireless communication unit 21 operates in a sleep mode requiring standby power. Further, since the power supply period to the wireless communication unit 21 can be matched between the plurality of monitoring devices 101 that have established time synchronization with each other, the power supply period to the wireless communication unit 21 in each monitoring device 101 is wasted. It is possible to prevent the monitoring information from being secured and allow the measurement information from each monitoring device 101 to reach the management device 171.

Therefore, the monitoring device 101 used in the power system according to the first embodiment of the present invention can effectively reduce power consumption.

The monitoring device 101 according to the first embodiment of the present invention includes a sensor 16 that operates by receiving power supply from the battery 14 and outputs measurement information indicating a measurement result. Further, the power supply control unit 23 controls start and stop of power supply to the sensor 16. In addition, the power supply control unit 23 performs a second power supply control that starts power supply to the sensor 16 and stops power supply after a second predetermined time has elapsed.

(4) With such a configuration in which the control for stopping the power supply to the sensor 16 is performed, the power consumption can be more effectively suppressed.

Further, in the monitoring device 101 according to the first embodiment of the present invention, the power supply control unit 23 performs the first or second power supply control during a part or all of the period during which power is supplied to the wireless communication unit 21. 2 Power supply control is performed.

With this configuration, measurement information indicating the measurement result of the sensor 16 can be transmitted in real time.

In the monitoring device 101 according to the first embodiment of the present invention, when the wireless communication unit 21 receives the predetermined information, the power supply control unit 23 stops the first power supply control and The power supply is continuously performed, and control is performed to start the power supply to the sensor 16 at a time based on the predetermined information.

With such a configuration, in a situation where there is a high need for the measurement result by the sensor 16 such as when a lightning strike is expected, power supply to the sensor 16 can be started at an appropriate timing.

Further, in the monitoring device 101 according to the first embodiment of the present invention, the power supply control unit 23 performs control to stop power supply to the wireless communication unit 21 and the sensor 16 at a time based on the predetermined information. (1) Restart the power supply control.

With such a configuration, in a situation where the necessity of the measurement result by the sensor 16 is reduced, for example, when a period in which a lightning strike is expected has elapsed, the power supply to the sensor 16 is stopped at an appropriate timing, and the power is again consumed. Power can be effectively suppressed.

[Modification]
FIG. 5 is a diagram illustrating a configuration of a monitoring device according to a modification of the first embodiment of the present invention.

Referring to FIG. 5, a monitoring device 102 according to a modification of the first embodiment of the present invention further includes a holding unit 32, a fourth power supply IC 33, as compared with monitoring device 101 shown in FIG. Is provided. The holding unit 32 is included in the wireless module 10.

電力 It is possible to perform power supply control on the time synchronization unit 31 separately from the power supply control unit 23. Specifically, the monitoring device 102 is connected to a power control unit 23 instead of the time synchronizing unit 22 as compared with the monitoring device 101 shown in FIG. A synchronization unit 31 is provided.

The fourth power supply IC 33 includes, for example, a switch for switching a connection state between the time synchronization unit 31 and the battery 14.

The power supply control unit 23 starts power supply to the time synchronization unit 31 during a period in which power supply to the wireless communication unit 21 is being performed by the first power supply control, and ends the synchronization processing by the time synchronization unit 31. The control to stop the power supply to the time synchronization unit 31 is performed.

More specifically, the holding unit 32 holds the synchronization processing time at which the synchronization processing by the time synchronization unit 31 has been performed.

(4) After starting the power supply to the wireless communication unit 21, the power control unit 23 checks the synchronization processing time stored in the storage unit 32. Then, the power control unit 23 outputs a control signal to the third power supply IC 13 and the fourth power supply IC 33 when the current time has passed a predetermined time or more from the synchronization processing time.

(3) The third power supply IC 13 receives the control signal output from the power supply control unit 23, and connects the battery 14 and the time information reception unit 17 to start supplying power to the time information reception unit 17.

(4) The fourth power supply IC 33 receives the control signal output from the power supply control unit 23 and starts supplying power to the time synchronization unit 31 by connecting the battery 14 and the time synchronization unit 31.

The time information receiving unit 17 receives power supply from the battery 14, receives standard time information transmitted from, for example, a GPS satellite, and outputs the received standard time information to the time synchronizing unit 31. Note that the time information receiving unit 17 may receive the time information transmitted from another monitoring apparatus 102 and output the received time information to the time synchronizing unit 31 instead of the standard time information.

(4) The time synchronization unit 31 receives the standard time information output from the time information reception unit 17, and performs a synchronization process of the RTC 15 using the standard time information.

The power control unit 23 outputs a control signal to the third power supply IC 13 and the fourth power supply IC 33 after the synchronization processing by the time synchronization unit 31 is performed.

(3) The third power supply IC 13 receives the control signal output from the power supply control unit 23 and disconnects the connection between the battery 14 and the time information reception unit 17 to stop supplying power to the time information reception unit 17.

(4) The fourth power supply IC 33 receives the control signal output from the power supply control unit 23, and disconnects the connection between the battery 14 and the time synchronization unit 31 to stop supplying power to the time synchronization unit 31.

On the other hand, when the current time has not elapsed from the synchronization processing time held in the holding unit 32 for a predetermined time, the power control unit 23 performs control to start power supply to the time information receiving unit 17 and the time synchronizing unit 31. Not performed.

The monitoring device 102 may not include the holding unit 32. In this case, for example, each time power is supplied to the wireless communication unit 21 by the first power supply control, the power control unit 23 starts power supply to the time synchronization unit 31 and performs synchronization processing by the time synchronization unit 31. Is completed, control to stop the power supply to the time synchronization unit 31 is performed.

As described above, in the monitoring device 101 according to the modification of the first embodiment of the present invention, it is possible to control the power supply to the time synchronization unit 31 separately from the power supply control unit 23. Specifically, the power supply control unit 23 starts the power supply to the time synchronization unit 31 during the period when the power supply to the wireless communication unit 21 is being performed by the first power supply control, and ends the synchronization processing. The control to stop the power supply to the time synchronization unit 31 is performed.

(4) With such a configuration in which the power supply to the time synchronization unit 31 is controlled to be stopped in a period other than the period in which the synchronization process is performed by the time synchronization unit 31, power consumption can be more effectively suppressed.

In addition, in the monitoring apparatus 101 according to the modification of the first embodiment of the present invention, the holding unit 32 holds the synchronization processing time at which the synchronization processing was performed. The power control unit 23 performs control to start power supply to the time synchronization unit 31 when a predetermined time has elapsed from the synchronization processing time.

With this configuration, if the predetermined time has not elapsed since the last synchronization processing, power supply to the time synchronization unit 31 is not started, so that power consumption can be more effectively suppressed.

In the monitoring device 101 according to the modified example of the first embodiment of the present invention, the monitoring device 102 is connected to the wireless module 10 including the power control unit 23 and is a separate device from the power control unit 23. Although the configuration includes a certain time synchronization unit 31, the configuration is not limited to this. For example, the configuration may be such that the time synchronization unit 31 and the fourth power supply IC 33 are included in the wireless module 10.

Next, another embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding portions have the same reference characters allotted, and description thereof will not be repeated.

<Second embodiment>
Referring again to FIG. 2, in monitoring device 101 according to the above-described first embodiment of the present invention, power control unit 23 receives a request from wireless communication unit 21 for predetermined information, specifically, a start notification request. In this case, the control for stopping the first power supply and starting the power supply to the sensor 16 is performed.

On the other hand, in the monitoring device 103 according to the second embodiment of the present invention, the power supply control unit 23 starts the power supply to the sensor 26 and stops the power supply to the sensor 26 after a lapse of a predetermined time. The second power supply control is performed periodically or irregularly.

[Configuration and basic operation]
The monitoring device 103 includes a sensor 26 instead of the sensor 16 as compared with the monitoring device 101. The sensor 26 is an acceleration sensor for measuring the inclination of the tower 2 provided with its own monitoring device 103, a sensor for measuring the temperature used for monitoring the temperature of the power system, or the depth of snow on the ground. It is a sensor for measuring.

For example, when the monitoring device 101 is installed on a transmission line, the sensor 26 measures the temperature used for monitoring the temperature of the transmission line, or the inclination of the transmission line due to slackness or the like.

When the monitoring device 101 is installed on the overhead ground line GW, the sensor 26 measures, for example, the temperature used for monitoring the temperature of the overhead ground line GW, or the inclination of the overhead ground line GW due to slackness or the like.

When the monitoring device 101 is installed on the ground around the tower 2, the sensor 26 measures, for example, the inclination of the ground, the vibration of the ground, or the depth of snow on the ground.

(4) The measurement target of the sensor 26 and the type of the sensor 26 in the monitoring device 101 are appropriately set.

(4) The power control unit 23 performs the second power control during part or all of the period in which power is supplied to the wireless communication unit 21 by the first power control, for example.

More specifically, after the power supply from the battery 14 to the wireless module 10 is started, the power supply control unit 23 outputs a control signal to the second power supply IC 12 and the third power supply IC 13 so that the sensor 26 and the time information reception unit The control for starting the power supply to the power supply 17 is performed.

The time information receiving unit 17 receives the power supply from the battery 14, receives, for example, standard time information transmitted from a GPS satellite, and outputs the received standard time information to the time synchronizing unit 22. The time synchronization unit 22 performs a synchronization process of the RTC 15 using the standard time information received from the time information reception unit 17.

The sensor 26 receives the power supply from the battery 14 and measures, for example, the acceleration of the tower 2 provided with its own monitoring device 103, and outputs the measurement result to the wireless communication unit 21.

The wireless communication unit 21 generates a wireless signal including measurement information indicating the measurement result output from the sensor 26, and transmits the generated wireless signal to the management device 171 via one or more other monitoring devices 103 and the collection device 151. Send. Note that the wireless communication unit 21 in the monitoring device 101 provided in the tower 2 a transmits a wireless signal to the management device 171 via the collection device 151.

The power control unit 23 outputs a control signal to the second power supply IC 12 and the third power supply IC 13 after the synchronization processing by the time synchronization unit 22 is performed, so that the power supply to the sensor 26 and the time information reception unit 17 is performed. Control to stop supply.

Further, after stopping the power supply to the sensor 26 and the time information receiving unit 17, the power supply control unit 23 outputs a control signal to the first power supply IC 11 to control the power supply to the wireless communication unit 21 to stop. That is, control for stopping power supply to the wireless module 10 is performed.

The power control unit 23 may be configured to perform the second power control during the entire period during which power is supplied to the wireless communication unit 21 by the first power control. That is, the power supply control unit 23 may perform control to stop the power supply to the sensor 26 at the timing when the power supply to the wireless module 10 is stopped.

Further, a part of the period in which the power supply to the sensor 26 is performed by the second power supply control may not be included in the period in which the power supply to the wireless communication unit 21 is performed by the first power supply control. .

Further, the wireless communication unit 21 may be configured to transmit a wireless signal including measurement information indicating the measurement result when the measurement result satisfies a predetermined condition, such as when the measurement result is a value equal to or greater than a threshold value. .

[Flow of operation]
FIG. 6 is a flowchart that defines an operation procedure of power supply control by the monitoring device according to the second embodiment of the present invention.

Referring to FIG. 6, first, RTC 15 performs control to start power supply to wireless module 10 by outputting a control signal to first power supply IC 11 at a start-up time set by power supply control unit 23. (Step S51).

Next, the power control unit 23 sets the next start time in the RTC 15 (step S52).

Next, the power control unit 23 performs control to start power supply to the sensor 16 and the time information receiving unit 17 by, for example, outputting a control signal to the second power supply IC 12 and the third power supply IC 13 (step S53). ).

Next, the time information receiving unit 17 receives the standard time information transmitted from, for example, a GPS satellite, and outputs the received standard time information to the time synchronizing unit 22 (step S54).

Next, the time synchronization unit 22 performs a synchronization process of the RTC 15 using the standard time information received from the time information reception unit 17 (Step S55).

Next, the sensor 26 measures, for example, the acceleration of the tower 2 provided with its own monitoring device 103, and outputs the measurement result to the wireless communication unit 21 (step S56).

Next, the wireless communication unit 21 sends a wireless signal including measurement information indicating the measurement result output from the sensor 26 to the management device 171 via, for example, one or more other monitoring devices 101 and the collection device 151. It transmits (step S57).

Next, the power control unit 23 performs control to stop supplying power to the sensor 26 and the time information receiving unit 17 by, for example, outputting a control signal to the second power supply IC 12 and the third power supply IC 13 (step S58). ).

Next, the power control unit 23 outputs a control signal to the first power supply IC 11 to perform control to stop power supply to the wireless module 10 (step S59). The power supply control unit 23 performs the control shown in steps S51 to S59 at a period of time T1.

Note that the start timing of the power supply to the sensor 26 and the start timing of the power supply to the time information receiving unit 17 may be different timings. Further, the timing of stopping the power supply to the sensor 26 and the timing of stopping the power supply to the time information receiving unit 17 may be different timings.

電源 As described above, in the monitoring device 103 according to the second embodiment of the present invention, the power supply control unit 23 controls start and stop of power supply to the sensor 26. In addition, the power supply control unit 23 performs a second power supply control that starts the power supply to the sensor 26 and stops the power supply after a predetermined time has elapsed.

構成 Thus, with the configuration in which the control for stopping the power supply to the sensor 26 is performed, the power consumption can be more effectively suppressed.

Further, in the monitoring device 103 according to the second embodiment of the present invention, the power supply control unit 23 performs the power supply 2 Power supply control is performed.

With such a configuration, measurement information indicating the measurement result of the sensor 26 can be transmitted in real time.

Other configurations and operations are the same as those of monitoring apparatus 101 according to the above-described first embodiment of the present invention, and thus detailed description will not be repeated here.

Although the monitoring device according to the first and second embodiments of the present invention has a configuration including the battery 14, the present invention is not limited to this. For example, the battery 14 may be configured to be provided outside the monitoring device.

The monitoring device according to the first embodiment of the present invention includes the sensor 16, and the monitoring device according to the second embodiment includes the sensor 26, but is not limited thereto. is not. For example, the sensors 16 and 26 may be provided outside the monitoring device and connected to the monitoring device.

Also, although the monitoring devices according to the first and second embodiments of the present invention are configured to perform wireless communication, the present invention is not limited to this. For example, the monitoring device may be configured to perform PLC communication via an underground cable.

For example, the monitoring device may be configured to include the following PLC communication unit instead of the wireless communication unit 21. Specifically, for example, the PLC communication unit includes an electromagnetic coupling unit that electromagnetically couples with a shielding layer of the underground cable, and a communication unit that transmits communication information via the shielding layer. The communication unit transmits the communication information using a communication induction current that is an induction current flowing through the shielding layer due to electromagnetic coupling of the electromagnetic coupling unit.

The above embodiments are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

The above description includes the features described below.
[Appendix 1]
A monitoring device used for an electric power system,
A sensor that operates by receiving power from a battery,
A communication unit that operates by receiving power supply from a battery and transfers information;
A time synchronization unit that operates upon receiving power supply from a battery and performs a synchronization process for time synchronization with the other monitoring devices,
A power control unit that operates upon receiving power supply from a battery and controls start and stop of power supply to the communication unit,
The power supply control unit starts power supply to the communication unit, and periodically performs first power supply control to stop the power supply after a predetermined time has elapsed,
The sensor measures the amount of charge in an overhead ground wire connected to the tower, or an acceleration for detecting the inclination of the tower,
The time synchronization unit performs the synchronization process using standard time information transmitted from a GPS satellite,
A monitoring device, wherein an interval at which the power control unit performs the first power control is longer than the predetermined time.

2,2a steel tower 10 wireless module 11 first power supply IC
12 Second power supply IC
13 Third power supply IC
14 Battery 15 RTC
16, 26 sensor 17 time information receiving section 21

wireless communication section

22, 31 time synchronizing section 23 power control section 32 holding section 33 fourth power IC
101, 101A, 101B, 101C, 102, 103 Monitoring device 151 Collection device 171 Management device 301 Monitoring system

Claims

A monitoring device used for an electric power system,
A communication unit that operates by receiving power supply from a battery and transfers information;
A time synchronization unit that operates upon receiving power supply from a battery and performs a synchronization process for time synchronization with the other monitoring devices,
A power control unit that operates upon receiving power supply from a battery and controls start and stop of power supply to the communication unit,
A monitoring device, wherein the power supply control unit starts power supply to the communication unit and periodically performs a first power supply control to stop the power supply after a lapse of a first predetermined time.
The monitoring device further operates or receives power supply from a battery, and further includes a sensor that outputs measurement information indicating a measurement result as the information, or is connected to the sensor,
The power control unit controls start and stop of power supply to the sensor,
The monitoring device according to claim 1, wherein the power supply control unit performs a second power supply control to start power supply to the sensor and stop the power supply after a lapse of a second predetermined time.
3. The monitoring device according to claim 2, wherein the power control unit performs the second power control during part or all of a period during which power is supplied to the communication unit by the first power control. 4.
The monitoring device further operates or receives power supply from a battery, and further includes a sensor that outputs measurement information indicating a measurement result as the information, or is connected to the sensor,
When the communication unit receives the predetermined information, the power supply control unit stops the first power supply control and continuously supplies power to the communication unit, and transmits the power to the sensor at a time based on the predetermined information. The monitoring device according to any one of claims 1 to 3, wherein the monitoring device performs control to start power supply of the monitoring device.
5. The monitoring device according to claim 4, wherein the power control unit performs control to stop power supply to the communication unit and the sensor at a time based on the predetermined information, and restarts the first power control.
For the time synchronization unit, it is possible to perform power supply control separately from the power control unit,
The power supply control unit starts power supply to the time synchronization unit during a period in which power supply to the communication unit is being performed by the first power supply control, and when the synchronization process ends, the time synchronization unit The monitoring device according to any one of claims 1 to 5, wherein the monitoring device performs control for stopping power supply to the power supply.
The monitoring device further comprises:
A holding unit that holds a synchronization processing time at which the synchronization processing is performed,
The monitoring device according to claim 6, wherein the power control unit performs control to start power supply to the time synchronization unit when a predetermined time has elapsed from the synchronization processing time.