JP6167085B2 - Wireless measurement system, wireless sensor terminal, and device management method - Google Patents

Description

The present invention relates to a wireless measurement system and a device management method for measuring a sign of device failure, and a wireless sensor terminal applied to the wireless measurement system.

  In recent years, from the viewpoint of beautification of cityscapes and disaster prevention measures, there has been an increasing movement of burying electric wires underground and eliminating utility poles from the road. Conventionally, a transformer or a switch installed on a power pole is installed in a metal case called a ground device installed on a roadside or the like when an electric wire is buried in the ground.

  The devices in these metal cases are connected to electric wires embedded in the ground to perform transformation or cut off of power supply. Since these ground devices are connected to underground electric wires, they are susceptible to insulation deterioration due to moisture from the underground, which may cause failure. When a ground device breaks down, it causes a power outage in the vicinity. Conventionally, this is dealt with by replacing all the corresponding devices after a certain period. In addition, in order to prevent failure, inspectors regularly visit the site to open the doors of equipment and perform internal inspections using dedicated measuring equipment such as acoustic sensors.

  Patent Document 1 describes an example of an insulation deterioration diagnosis method applicable to such equipment inspection.

JP 2003-43094 A

By the way, electricity with a voltage of several thousand volts flows through the ground equipment connected to the underground electric wire. For this reason, when opening the door of the ground equipment and inspecting the inside, there is a risk that the inspector may get an electric shock. In addition, since it is necessary for the inspector to visit the site where the ground equipment is installed, it is necessary to inspect each unit, which is very time-consuming and inefficient, and has a problem that the cost required for the inspection is high. .
In addition, acoustic sensors that have been used for inspection of ground equipment have been problematic in that they are difficult to handle and are difficult to install because the sensors themselves are expensive.

  An object of the present invention is to provide a wireless measurement system that can easily measure a sign of failure of a device such as a ground device connected to an underground electric wire with a small burden.

The wireless measurement system of the present invention is a wireless measurement system including a wireless sensor terminal installed in a device to be measured and a management device that manages the device to be measured by data transmitted from the wireless sensor terminal.
The wireless sensor terminal includes a radio wave condition measurement unit that measures a radio wave condition in the measurement target device, a vibration measurement unit that measures a vibration condition of the measurement target device, and radio wave condition measurement data measured by the radio wave condition measurement unit, A memory for storing measurement data of the vibration state detected by the vibration measuring unit or analysis data based on these measurement data, and a communication unit for receiving signals from the outside and transmitting the data stored in the memory A control unit that performs control to transmit measurement data or analysis data stored in the memory from the communication unit based on a signal received by the communication unit.
The management apparatus includes a connection unit that receives data transmitted from the wireless sensor terminal, and a management unit that manages the device to be measured based on the data received by the connection unit.

  In addition, the wireless sensor terminal of the present invention includes a radio wave condition measuring unit that measures a radio wave condition in a measurement target device, a vibration measurement unit that measures a vibration condition of the measurement target device, and a radio wave measured by the radio wave condition measurement unit. Measurement data of the situation and measurement data of the vibration situation measured by the vibration measuring unit, or a memory in which analysis data of these measurement data is stored, and communication for receiving a signal from the outside and transmitting the data stored in the memory And a control unit that performs control to transmit data stored in the memory based on the signal received by the communication unit.

In addition, the device management method of the present invention is a wireless measurement system including a wireless sensor terminal installed in a device to be measured and a management device that manages the device to be measured by data transmitted from the wireless sensor terminal. Applicable device management method,
The wireless sensor terminal includes a radio wave condition measurement process for measuring a radio wave condition in the measurement target device, a vibration measurement process for measuring a vibration condition of the measurement target apparatus, and measurement data of the radio wave condition measured by the radio wave condition measurement process, , Storage processing for storing vibration state measurement data detected by vibration measurement processing, or analysis data based on these measurement data, and communication for receiving signals from the outside and transmitting the data stored in the storage processing And a control process for performing control to transmit the measurement data or the analysis data stored in the storage process in the communication process based on the signal received in the communication process,
The management apparatus executes a connection process for receiving data transmitted by the wireless sensor terminal and a management process for managing the device under measurement based on the data received in the connection process.

  According to the present invention, an external management apparatus can accurately diagnose a sign of a failure of a device under measurement from the radio wave status and vibration status in the device. Therefore, for example, by applying it to predictive failure diagnosis of ground equipment connected to underground cables, it is not necessary for the inspector to visit the installation location of the equipment, open the door of the equipment, and inspect the inside. Therefore, it is possible to diagnose a sign of failure more efficiently and at a lower cost than in the past.

It is a figure which shows the example of the whole system by the 1st Example of this invention. It is a block diagram which shows the example of the wireless sensor terminal by the 1st Example of this invention. It is a block diagram which shows the example of the mobile station by the 1st Example of this invention. It is a block diagram which shows the example of the server by the 1st Example of this invention. It is a flowchart which shows the example of a process of the failure sign judgment by the 1st Example of this invention. It is a flowchart which shows the process example in the server by the 1st Example of this invention. It is a flowchart which shows the process example by the detection data of the electromagnetic wave condition by the 1st Example of this invention. It is a flowchart which shows the process example at the time of the request reception in the wireless sensor terminal by the 1st Example of this invention. It is a flowchart which shows the example of a measurement process in the wireless sensor terminal by the 1st Example of this invention. It is a sequence diagram which shows the example of the transmission state of the data by the 1st Example of this invention. It is a sequence diagram which shows the example (example which performs the instruction | indication of an additional measurement) of the transmission state of the data by the 1st Example of this invention. It is a sequence diagram which shows the example (example which detects an electromagnetic wave condition and a vibration condition) of the transmission state of the data by the 1st Example of this invention. It is a block diagram which shows the example of the wireless sensor terminal by the 2nd Example of this invention. It is a block diagram which shows the example of the server by the 2nd Example of this invention. It is a flowchart which shows the failure sign judgment processing example by the 2nd Example of this invention. It is a flowchart which shows the example of a process in the wireless sensor terminal by the 2nd Example of this invention.

<1. First Embodiment>
The first embodiment of the present invention will be described below with reference to FIGS.

[1-1. Overall system configuration]
FIG. 1 shows a configuration example of the entire wireless measurement system.
Here, a plurality of ground devices 40a, 40b,... Connected to electric wires embedded in the ground are arranged along a road or the like. In the first embodiment, judgment of a failure sign of the ground devices 40a, 40b,... Is performed.

  Each of the ground devices 40a, 40b,... Has a transformer and a switch built in a metal case. Further, wireless sensor terminals 10a, 10b,... Are arranged in the metal cases of the ground devices 40a, 40b,. The wireless sensor terminals 10a, 10b,... Are terminals that perform wireless communication with the mobile station 20 in proximity to the ground devices 40a, 40b, and the ground devices 40a, 40b,. Measure state.

  In the example of FIG. 1, the mobile station 20 is mounted on a vehicle such as an automobile and performs two-way wireless communication with the wireless sensor terminals 10 a, 10 b,. Therefore, the automobile on which the mobile station 20 is mounted travels along a route that sequentially passes through the vicinity of the place where the ground devices 40a, 40b,.

The mobile station 20 can communicate with the management device 30 prepared in this system. In the following description, the management device 30 is referred to as a server 30. The communication between the mobile station 20 and the server 30 may be performed by connecting the mobile station 20 directly to the data input / output port of the server 30 in addition to performing wireless communication. Alternatively, data transfer may be performed between the mobile station 20 and the server 30 using a recording medium such as a memory card. The communication between the mobile station 20 and the server 30 is performed, for example, before the vehicle travels and the mobile station 20 communicates with the ground devices 40a, 40b,.
In the following description, the plurality of wireless sensor terminals 10a, 10b,... And the ground devices 40a, 40b,. The wireless sensor terminal 10 and the ground device 40 will be described.

[1-2. Configuration of wireless sensor terminal]
FIG. 2 shows the configuration of the wireless sensor terminal 10.
The wireless sensor terminal 10 includes a communication unit 11, a radio wave state measurement unit 12, a memory 13, a vibration measurement unit 14, and a control unit 15. An antenna 18 is connected to the communication unit 11 and the radio wave condition measurement unit 12. A vibration sensor 16 is connected to the vibration measuring unit 14.

  The communication unit 11 performs short-range wireless communication with a partner having a distance of about several tens of meters at the maximum using a frequency of about 920 MHz, for example. The radio wave condition measurement unit 12 measures radio waves of a specific frequency (for example, GHz band) generated in the ground device 40 housed in a metal case, and outputs detection data. The radio wave condition measuring unit 12 detects radio noise generated when, for example, a transformer or a switch in the ground device 40 deteriorates.

The vibration measuring unit 14 detects vibration applied to the wireless sensor terminal 10 itself based on the output of the vibration sensor 16 and outputs detection data of the vibration. The vibration measurement by the vibration sensor 16 and the vibration measurement unit 14 is performed under the control of the control unit 15 when the control unit 15 is in a mode for measuring vibration.
The radio wave condition measurement data measured by the radio wave condition measurement unit 12 and the vibration measurement data measured by the vibration measurement unit 14 are stored in the memory 13 by the control unit 15. As the memory 13, for example, a nonvolatile memory is used.

When the control unit 15 receives a request for transmitting detection data from the mobile station 20 (FIG. 1) through communication in the communication unit 11, the control unit 15 wirelessly transmits the measurement data stored in the memory 13 to the mobile station 20.
The wireless sensor terminal 10 includes, for example, a battery and operates with a power source obtained from the battery.

[1-3. Configuration of mobile station]
FIG. 3 shows the configuration of the mobile station 20. The mobile station 20 includes a communication unit 21, a memory 22, a server connection unit 23, and a control unit 24. When the antenna 25 is connected to the communication unit 21 and close to the ground device 40, the communication unit 21 performs wireless communication with the communication unit 11 in the wireless sensor terminal 10 installed in the ground device 40. During this wireless communication, the mobile station 20 identifies which wireless sensor terminal 10 is communicating. And the communication part 21 transmits the request signal with respect to each wireless sensor terminal 10 based on control of the control part 24. FIG.

  Further, after the communication unit 21 transmits the request signal, when the communication unit 21 receives measurement data (measurement data of radio wave condition and measurement data of vibration) from each wireless sensor terminal 10, the measurement data is stored in the control unit 24. It is stored in the memory 22 by control. At this time, for example, an identification code indicating which wireless sensor terminal 10 is the measurement data is added to the stored data.

The server connection unit 23 communicates with the server 30 via, for example, the wireless or wired network 1 (FIG. 4).
The measurement data stored in the memory 22 is transferred to the server 30 by the control unit 24 via the server connection unit 23. Further, various request signals and the like for each wireless sensor terminal 10 received by the server connection unit 23 from the server 30 are stored in the memory 22.

[1-4. Server configuration]
FIG. 4 shows a configuration of the server 30 that is a management apparatus.
The server 30 includes a mobile station connection unit 31, a terminal management unit 32, a failure sign diagnosis unit 33, and a display unit 34.
The mobile station connection unit 31 communicates with the mobile station 20 via the network 1. The terminal management unit 32 manages the state of each wireless sensor terminal 10. The failure sign diagnosis unit 33 diagnoses a failure sign of the ground device 40 in which each wireless sensor terminal 10 is installed based on the measurement data of each wireless sensor terminal 10 received via the mobile station connection unit 31.
The display unit 34 displays a failure sign diagnosis result of each ground device 40 managed by the terminal management unit 32.

[1-5. Overall system operation]
The flowchart of FIG. 5 shows the flow of operation of the entire wireless measurement system.
First, the wireless sensor terminal 10 installed in the ground device 40 measures the radio wave situation around itself at regular intervals by the radio wave situation measuring unit 12, and records the result as measurement data (step S10).
The communication unit 11 of the wireless sensor terminal 10 normally stands by in a reception standby state, and when receiving a data request signal from the mobile station 20, transmits measurement data to the mobile station 20 (step S11). .

  The automobile on which the mobile station 20 is mounted travels on a route that sequentially passes through the vicinity of the place where the ground device 40 is installed. And the measurement data accumulate | stored in each wireless sensor terminal 10 are collect | recovered, transmitting the data request signal mentioned above when approaching each ground device 40. FIG. The mobile station 20 transmits the collected data to the server 30 (step S12). Transmission from the mobile station 20 to the server 30 is performed in a lump via, for example, the wireless or wired network 1. Alternatively, every time the mobile station 20 collects the measurement data, data may be transmitted from the mobile station 20 to the server 30 as needed using the wireless network 1.

The server 30 analyzes the collected measurement data, verifies the sign of failure, and determines whether there is a terminal having a sign of failure (step S13). A method of verifying a failure sign by the server 30 will be described later. Here, for example, it is assumed that the wireless sensor terminal 10a determines that there is a sign of failure.
At this time, the server 30 generates a request signal for an additional measurement instruction for instructing the corresponding wireless sensor terminal 10 a to measure the vibration state using the vibration sensor 16. The request signal for the additional measurement instruction is delivered to the mobile station 20 when the mobile station 20 and the server 30 communicate with each other, and is stored in the memory 22 in the mobile station 20 (step S14).

Next, when the mobile station 20 storing the request signal for this additional measurement instruction collects measurement data from each of the wireless sensor terminals 10a, 10b,..., Additional measurement is performed during wireless communication with the wireless sensor terminal 10a. An instruction request signal is transmitted (step S15).
The wireless sensor terminal 10 a that has received the request signal for the additional measurement instruction starts measurement of the vibration status by the vibration measurement unit 14 in addition to the measurement of the radio wave status by the radio wave status measurement unit 12. The switching of the measurement state by the request signal is performed under the control of the control unit 15 in the wireless sensor terminal 10a, and each measurement data is stored in the memory 13 (step S16).

When the wireless sensor terminal 10a receives the next request signal, the radio wave condition measurement data and the vibration condition measurement data stored in the memory 13 are transmitted to the mobile station 20 (step S17). The mobile station 20 transmits the collected measurement data to the server 30 (step S18).
The server 30 analyzes the radio wave condition measurement data and the vibration condition measurement data received from the mobile station 20 more accurately, and determines whether or not there is a failure sign of the ground device 40 in which the wireless sensor terminal 10a is installed (step). S19). If there is a reliable sign of failure in this analysis, the server 30 notifies the administrator of the sign of failure by displaying that fact on the screen of the display unit 34. The administrator who has confirmed this notification takes countermeasures such as dispatching maintenance personnel and creating an inspection schedule. By taking a countermeasure against the ground device 40 based on the detection of such a failure sign, damage due to a sudden failure of the ground device 40 can be prevented.

[1-6. Server failure sign judgment process]
The flowchart in FIG. 6 shows an example of failure sign determination processing in the server 30. Here, the presence / absence of a failure sign is determined by the failure sign diagnosis unit 33 by examining whether, for example, a high frequency in the GHz band is generated at a constant interval linked to the power supply frequency. For example, in an area where the power supply frequency is 60 Hz, the ground equipment on which insulation deterioration has occurred causes partial discharge at intervals of 60 Hz. Along with this, radio noise extending to the GHz band at 60 Hz intervals is generated. The failure sign diagnosis unit 33 of the server 30 checks the presence or absence of the radio noise from the measurement result, and performs a preliminary diagnosis of the failure sign of the ground device 40.

An example of specific processing will be described with reference to FIG. 6. First, the failure sign diagnosis unit 33 of the server 30 applies a high-pass filter to the measurement data to cut a signal in a band of GHz or lower (step S20). . Next, the failure sign diagnosis unit 33 cuts the measurement results at intervals of 60 Hz corresponding to the power supply frequency, and adds them at the same phase (step S21).
As a result, only the signals generated at intervals of 60 Hz are added with the same phase as the measurement data addition result, and the target noise section is amplified. On the other hand, signals outside the target noise section are not amplified because the phases are different. Thereby, only the radio noise generated by the partial discharge is emphasized, and the failure sign diagnosis unit 33 can check the presence / absence of radio noise depending on whether the strength of the measurement result after addition exceeds a certain threshold value.

That is, the failure sign diagnosis unit 33 determines whether or not the maximum value of the signal after the addition exceeds the threshold value (step S22). When the threshold value is exceeded, the failure sign diagnosis unit 33 determines that the ground device 40 in which the corresponding wireless sensor terminal 10 is installed has a failure sign (step S23). At this time, the terminal management unit 32 of the server 30 generates a request signal instructing additional measurement to the wireless sensor terminal 10 that has performed the measurement, and the server 30 communicates the request signal with the mobile station 20. Transmit to the mobile station 20 (step S24).
If the maximum value of the added signal does not exceed the threshold value in step S22, the failure sign diagnosis unit 33 determines that there is no sign of failure for the ground device 40 in which the corresponding wireless sensor terminal 10 is installed. (Step S25). At this time, the terminal management unit 32 of the server 30 continues the measurement in the normal state at the wireless sensor terminal 10 that performed the measurement (step S26).

In the flowchart of FIG. 7, when the wireless sensor terminal 10 measures the radio wave condition and the vibration state, the failure sign diagnosis unit 33 of the server 30 obtains the measurement data and accurately diagnoses the failure sign. An example of the process of performing is shown.
First, the failure sign diagnosis unit 33 analyzes the radio wave condition measurement result (step S30). The analysis in step S30 is the same process as the analysis process described in steps S20 and S21 in the flowchart of FIG. Then, the failure sign diagnosis unit 33 determines whether or not the maximum value of the analysis result signal exceeds the threshold value (step S31). Here, when the threshold value is exceeded, the failure sign diagnosis unit 33 checks the phase at which the output exceeds the threshold value, that is, the time from the start of measurement (step S32).

Next, the failure sign diagnosis unit 33 determines whether or not vibration having a certain amplitude or more is generated in the same period and the same phase as the measurement data of the radio wave environment in the vibration measurement result (step S33). ). If it is determined in step S33 that the vibration having a certain amplitude or more is generated, the failure sign diagnosis unit 33 generates a partial discharge inside the ground device 40, which causes radio noise. Judge that it occurred. Then, it is determined that there is a sign of failure of the corresponding ground device 40 (step S34).
Further, when it is determined in step S33 that no vibration with a certain amplitude or more has occurred, the failure sign diagnosis unit 33 determines that there is no sign of failure of the corresponding ground device 40 (step S35).

[1-7. Operation of wireless sensor terminal]
FIG. 8 is a flowchart showing an operation when the wireless sensor terminal 10 communicates with the mobile station 20.
The communication unit 11 of the wireless sensor terminal 10 is normally in a reception standby state (step S40) and waits for reception of a data request signal from the mobile station 20. When the communication unit 11 receives the data request signal from the mobile station 20 (step S41), the control unit 15 measures the radio wave condition at the radio wave condition measurement unit 12 and the vibration measurement unit 14 at the time of the previous radio wave condition measurement. It is determined whether or not the two measurements, i.e., the measurement of the vibration state at, have been performed simultaneously (step S42).

Here, when two measurements are simultaneously performed at the time of the previous radio wave condition measurement, the control unit 15 reads out the radio wave condition measurement data and the vibration condition measurement data stored in the memory 13, and transmits the data from the communication unit 11 to the mobile station. 20 (step S43).
Further, when only the radio wave condition is measured at the time of the previous radio wave condition measurement, the control unit 15 reads the radio wave condition measurement data stored in the memory 13 and transmits the radio wave condition measurement data from the communication unit 11 to the mobile station 20. Transmit (step S45).
And after transmitting the measurement data of step S43 or step S45, the communication part 11 returns to a reception standby state (step S44).

FIG. 9 is a flowchart showing a measurement state in the wireless sensor terminal 10.
When the predetermined measurement time is reached (step S50), the control unit 15 of the wireless sensor terminal 10 determines whether or not an additional measurement request signal has been received in the previous communication with the mobile station 20 (step S51). ). If it is determined in step S51 that a request signal for additional measurement has been received, the control unit 15 simultaneously measures the radio wave condition and the vibration condition, and stores each measurement data in the memory 13 (step S51). S52).
If it is determined in step S51 that the additional measurement request signal has not been received, the control unit 15 performs only the measurement of the radio wave condition and stores the measurement data of the radio wave condition in the memory 13 ( Step S53).
Note that the measurement by the process of the flowchart of FIG. 9 may be a relatively small number of measurements, for example, several times a day to about once. Also, the measurement time for one measurement is a relatively short time selected from several seconds to several minutes.

[1-8. Example of data transmission in the system]
FIG. 10 is a sequence diagram illustrating an example of a state in which data transmission is performed in the system.
In FIG. 10, two wireless sensor terminals 10a and 10b are prepared. In each of the wireless sensor terminals 10a and 10b, the radio wave condition is measured at a time determined for each terminal (steps S101 and S102).
When the mobile station 20 approaches the wireless sensor terminal 10a, a data request signal is transmitted from the mobile station 20 to the wireless sensor terminal 10a (step S103). The wireless sensor terminal 10a that has received this data request signal returns the measurement data stored in the memory 13 to the mobile station 20 (step S104).

When the mobile station 20 approaches another wireless sensor terminal 10b, a data request signal is transmitted from the mobile station 20 to the wireless sensor terminal 10b (step S105). The wireless sensor terminal 10b that has received this data request signal returns the measurement data stored in the memory 13 to the mobile station 20 (step S106).
After completing the measurement data collection work from all the wireless sensor terminals 10, the mobile station 20 transmits the collected data to the server 30 (step S107). Then, the server 30 that has received the measurement data performs a failure sign diagnosis for each wireless sensor terminal 10 using the received measurement data (step S108). The failure sign diagnosis in step S108 is a diagnosis process using only the measurement data of the radio wave condition shown in the flowchart of FIG.

  Here, it is assumed that the wireless sensor terminal 10a determines that there is a failure sign in the failure sign diagnosis in step S108. When the server 30 detects a sign of failure, the wireless sensor in which the mobile station 20 detects the sign of failure when the vehicle equipped with the mobile station 20 goes around the wireless sensor terminals 10a, 10b,. An instruction for additional measurement is given to the terminal 10a.

FIG. 11 is a sequence diagram illustrating an example of a data transmission state when an instruction for additional measurement is given to the wireless sensor terminal 10a that has detected a failure sign.
First, the server 30 transmits data for instructing additional measurement of the wireless sensor terminal 10a to the mobile station 20 (step S111). As already described, in each of the wireless sensor terminals 10a and 10b, the radio wave condition is measured at a time determined for each terminal (steps S112 and S113).

  In this state, when the mobile station 20 approaches the wireless sensor terminal 10a, a data request signal including an instruction for additional measurement is transmitted from the mobile station 20 to the wireless sensor terminal 10a (step S114). The wireless sensor terminal 10a that has received this data request signal returns the measurement data stored in the memory 13 to the mobile station 20 (step S115). The measurement data returned at this time is measurement data of radio wave conditions, and does not include measurement data of vibration states.

When the mobile station 20 approaches another wireless sensor terminal 10b, a data request signal is transmitted from the mobile station 20 to the wireless sensor terminal 10b (step S116). The data request signal at this time does not include an instruction for additional measurement. Upon receiving this data request signal, the wireless sensor terminal 10b returns the measurement data stored in the memory 13 to the mobile station 20 (step S117).
After the tour of all the ground devices 40 is completed, the collected data is reported from the mobile station 20 to the server 30 (step S118). Then, the server 30 that has received the measurement data performs a failure sign diagnosis for each wireless sensor terminal 10 using the received measurement data (step S119). The failure sign diagnosis performed here is a failure sign diagnosis using only radio wave measurement data, similar to the failure sign diagnosis performed in step S108 of FIG.

  Here, in the wireless sensor terminal 10a that has transmitted the data request signal including the additional measurement instruction, both the measurement of the radio wave condition and the measurement of the vibration state are performed at the subsequent measurement time (step S120). Further, in the wireless sensor terminal 10b for which an instruction for additional measurement has not been performed, only the measurement of the radio wave condition is performed as before (step S121) even at the measurement time.

FIG. 12 is a sequence diagram showing an example of processing after the measurements in steps S120 and S121 are performed.
When the mobile station 20 approaches the wireless sensor terminal 10a, a data request signal including an instruction for additional measurement is transmitted from the mobile station 20 to the wireless sensor terminal 10a (step S122). The wireless sensor terminal 10a that has received this data request signal returns the measurement data stored in the memory 13 to the mobile station 20 (step S123). The measurement data returned at this time includes both radio wave condition measurement data and vibration state measurement data.
When the mobile station 20 approaches the wireless sensor terminal 10b, a data request signal is transmitted from the mobile station 20 to the wireless sensor terminal 10b (step S124). The wireless sensor terminal 10b that has received this data request signal returns the measurement data stored in the memory 13 to the mobile station 20 (step S125). The measurement data returned at this time is only the measurement data of the radio wave condition and does not include the measurement data of the vibration state.

  Then, after the patrol of all the ground devices 40 is completed, the collected data is reported from the mobile station 20 to the server 30 (step S126). In the server 30 that has received the measurement data, a failure sign diagnosis for each wireless sensor terminal 10 using the received measurement data is performed (step S127). The failure sign diagnosis is a diagnosis of a failure sign using both the measurement data of the radio wave status and the measurement data of the vibration status, while the diagnosis of the radio sensor terminal 10b is a radio wave measurement. It is a failure sign diagnosis using only data.

  By performing the failure sign diagnosis in step S127, the ground device 40a in which the wireless sensor terminal 10a is installed has high accuracy using both the measurement data of the radio wave condition and the measurement data of the vibration condition. Diagnosis of signs of failure is performed. Therefore, a diagnosis of a sign of a failure of each ground device 40 can be performed with less burden and higher accuracy than before. In other words, an inspector can go to the place where the ground equipment 40 is installed and open the door of each ground equipment 40 to inspect the inside without inspecting the inside of the equipment. It will be possible to diagnose failure signs.

In addition, each wireless sensor terminal 10 performs measurement using only the radio wave condition measuring unit 12 in a state where there is almost no sign of failure. Measurement using the two measurement units with the unit 14 is performed. Therefore, during normal times, measurement with low power consumption using only one measurement unit 12 is performed. This contributes to a longer battery duration when each wireless sensor terminal 10 is driven by a battery, for example.
In addition, when there is a sign of failure, more accurate measurement is performed using the two measuring units 12 and 14, and both low power consumption and high sign determination accuracy can be achieved.

<2. Second Embodiment>
The second embodiment of the present invention will be described below with reference to FIGS. 13 to FIG. 16, parts corresponding to those in FIG. 1 to FIG. 12 described in the first embodiment are given the same reference numerals.
Also in the second embodiment, as in the first embodiment, a failure sign of the ground device 40 to which the electric wire embedded in the ground is connected is determined. The configuration of the entire system is the same as the configuration of FIG. 1 described in the first embodiment and is omitted.
In the second embodiment, the wireless sensor terminal 10 ′ attached to the ground device 40 diagnoses a sign of failure, and the server 30 ′ collects data of the diagnostic results at the wireless sensor terminal 10 ′. Thus, the ground device 40 is managed.

[2-1. Configuration of wireless sensor terminal]
FIG. 13 shows a configuration of the wireless sensor terminal 10 ′.
The wireless sensor terminal 10 ′ is different from the wireless sensor terminal 10 shown in FIG. The analysis unit 17 analyzes the measurement data stored in the memory 13 and analyzes whether there is a sign of a failure of the ground device 40. Data obtained as a result of analysis by the analysis unit 17 is stored in the memory 13 under the control of the control unit 15. Data of the analysis result stored in the memory 13 is transmitted from the communication unit 11 to the mobile station 20 (FIG. 1). The analysis result data received by the mobile station 20 is transmitted to a server 30 'described below. The other configuration of the wireless sensor terminal 10 ′ is the same as that of the wireless sensor terminal 10 shown in FIG.

[2-2. Server configuration]
FIG. 14 shows the configuration of the server 30 ′.
The server 30 ′ includes a mobile station connection unit 31 that performs data transfer with the mobile station 20 via the network 1, a terminal management unit 32, and a display unit 34.
The terminal management unit 32 of the server 30 ′ manages the operation status of the wireless sensor terminal 10 ′, and collects the failure sign information from the mobile station 20 according to the collection status of the failure sign information. Instruct. The operator of the mobile station 20 collects failure sign information from the corresponding wireless sensor terminal 10 ′ according to the instruction and sends it to the server 30 ′. When the server 30 ′ receives a notification that there is a failure sign from the wireless sensor terminal 10 ′, the server 30 ′ issues a warning to the administrator on the display screen of the display unit 34. In response to this, the administrator takes countermeasures such as dispatching maintenance personnel to the corresponding ground equipment 40.

[2-3. Overall system operation]
FIG. 15 is a flowchart showing an operation flow of the entire wireless measurement system.
First, the wireless sensor terminal 10 ′ installed in the ground device 40 measures the radio wave condition around itself for every predetermined period by the radio wave condition measurement unit 12, and the analysis unit 17 analyzes the measurement data (step). S60). The analysis here is performed by, for example, the processing shown in steps S20 and S21 in the flowchart of FIG. 6, and the analysis result is stored in the memory 13.
Then, the control unit 15 of the wireless sensor terminal 10 ′ determines whether or not there is a failure sign from the analysis result of the radio wave condition measurement data (step S61). Here, when it is determined that there is a sign of failure, the radio sensor terminal 10 ′ measures the vibration applied to the terminal by the vibration measurement unit 14 at the same time as the radio wave condition measurement unit 12 measures the radio wave condition around itself ( Step S62). And the analysis part 17 diagnoses the presence or absence of a failure sign based on the measurement data of the radio wave condition measurement part 12, and the measurement data of the vibration measurement part 14 (step S63). The failure sign information indicating the diagnosis result is stored in the memory 13.

Then, when the diagnosis of the presence / absence of a failure sign is performed in step S63 and after it is determined that there is no sign of failure in step S61, the communication unit 11 of the wireless sensor terminal 10 ′ receives a data request signal from the mobile station 20. When received, the process proceeds to step S64.
In step S64, failure sign information indicating the analysis result analyzed by the analysis unit 17 and stored in the memory 13 is returned to the mobile station 20 that is the transmission source of the data request signal.

  The mobile station 20 completes the collection of the analysis result data from all the wireless sensor terminals 10 ′, and then transmits the collected data to the server 30 ′ (step S65). Then, based on the collected data, the terminal management unit 32 of the server 30 ′ determines the ground device 40 with a sign of failure, and displays the determined status of the ground device 40 on the display unit 34 to give a warning ( Step S66).

[2-4. Processing at wireless sensor terminal]
FIG. 16 is a flowchart illustrating an example of measurement and analysis processing performed by the wireless sensor terminal 10 ′.
First, the control unit 15 of the wireless sensor terminal 10 ′ causes the radio wave condition measurement unit 12 to perform measurement of the radio wave condition at a predetermined measurement time (step S70), and the analysis unit 17 analyzes the measurement data. This is executed (step S71).
And the control part 15 judges whether there is a failure sign from the analysis result of measurement data (step S72). If it is determined that there is a sign of failure, the control unit 15 causes the radio wave state measurement unit 12 to perform measurement of the radio wave state and simultaneously causes the vibration measurement unit 14 to execute measurement of the vibration state (step) S73).

Then, the analysis unit 17 uses the radio wave condition measurement data and the vibration condition measurement data to accurately diagnose a failure sign (step S74). The control unit 15 acquires data of the diagnosis result and determines whether or not there is a sign of failure (step S75). If it is determined that there is a failure sign, the control unit 15 creates failure sign information indicating that there is a failure sign, and stores the created failure sign information in the memory 13 (step S76). ).
If it is determined in step S75 that there is no failure sign, the control unit 15 creates failure sign information indicating that there is no failure sign, and stores the created failure sign information in the memory 13 ( Step S77).

  As described above, according to the second embodiment, the wireless sensor terminal 10 'side diagnoses a failure sign. Therefore, in each wireless sensor terminal 10 ′, the preliminary diagnosis using only the radio wave condition measurement data and the accurate diagnosis using the radio wave condition measurement data and the vibration condition measurement data are automatically switched. become. For this reason, it is not necessary for the server 30 'side to instruct the switching of the measurement state, and it is not necessary for the server 30' to analyze the measurement data, thereby reducing the burden on the server 30 '.

  Also in the case of the second embodiment, the wireless sensor terminal 10 'receives not only the failure sign information which is analysis result data but also the radio wave condition measurement data and the vibration condition measurement data. May be transmitted to the server 30 ′ via. By doing in this way, the failure sign can be analyzed also on the server 30 'side. In this case, it is necessary to provide an analysis unit in the server 30 '.

<3. Modification>
The measurement data measured by the wireless sensor terminal 10 and the data analyzed by the wireless sensor terminal 10 are transmitted via the mobile station 20 to the server 30 that is a management device. On the other hand, for example, when the communication unit 11 of the wireless sensor terminal 10 can be directly connected to an existing network such as a wireless local area network (LAN), data is transmitted to the server 30 via the network. You may make it do. Further, the communication unit 11 performs wireless communication with the communication unit 11 in the other wireless sensor terminal 10 in the vicinity by the ad hoc communication function, and sequentially transmits the measurement data and analysis data of each wireless sensor terminal 10. Also good.

  In the embodiment described above, each wireless sensor terminal 10 first diagnoses a preliminary failure sign based on the measurement of the radio wave condition, and adds the measurement of the vibration condition based on the result. Therefore, an accurate diagnosis of failure signs is performed. On the other hand, for example, when the wireless sensor terminal 10 performs the measurement, the measurement of the radio wave condition and the measurement of the vibration condition may be performed at all times. Further, the wireless sensor terminal 10 may be provided with a sensor for measuring a situation other than the radio wave situation and the vibration situation to further improve the diagnostic accuracy of the failure sign.

  Moreover, the wireless sensor terminal 10 showed the example which operate | moves using a battery as a power supply. On the other hand, you may make it operate the wireless sensor terminal 10 with the electric power taken out from the electric wire in the ground apparatus 40 by electromagnetic induction etc., for example. Or you may use auxiliary power supplies, such as a solar cell, together.

  Furthermore, in each embodiment mentioned above, it applied to the failure sign diagnosis of the ground equipment connected to the underground electric wire. On the other hand, the present invention may be applied to diagnosis of failure signs of other various devices.

  DESCRIPTION OF SYMBOLS 1 ... Network 10, 10a, 10b, 10 '... Wireless sensor terminal, 11 ... Communication part, 12 ... Radio wave condition measurement part, 13 Memory, 14 Vibration measurement part, 15 Control part, 16 Vibration sensor, 18 Antenna, 20 ... Mobile station, 21 ... communication unit, 22 ... memory, 23 ... server connection unit, 24 ... control unit, 25 ... antenna, 30, 30 '... server (management device), 31 ... mobile station connection unit, 32 ... terminal management unit 33 ... Failure sign diagnosis unit, 34 ... Display unit, 40a, 40b ... Ground equipment

Claims (10)

A wireless measurement system comprising a wireless sensor terminal installed in a device to be measured and a management device that manages the device to be measured by data transmitted from the wireless sensor terminal,
The wireless sensor terminal is
A radio wave condition measuring unit for measuring the radio wave condition in the device to be measured;
A vibration measuring unit for measuring a vibration state of the device to be measured;
Measurement data of the radio wave condition measured by the radio wave condition measurement unit, measurement data of the vibration situation detected by the vibration measurement unit, or a memory in which analysis data based on these measurement data is stored,
A communication unit that receives an external signal and transmits data stored in the memory;
A control unit that performs control to transmit measurement data or analysis data stored in the memory from the communication unit based on a signal received by the communication unit;
The management device
A connection unit for receiving data transmitted by the wireless sensor terminal;
A wireless measurement system comprising: a management unit that manages a device to be measured based on data received by the connection unit. The control unit is configured to store the measurement data of the radio wave condition measured by the radio wave condition measurement unit in the memory according to the request received by the communication unit, and the measurement data of the radio wave condition measured by the radio wave condition measurement unit; The wireless measurement system according to claim 1, wherein a mode for storing two measurement data including measurement data detected by the vibration measurement unit in the memory is set. The management device includes a failure sign diagnosis unit that diagnoses a failure sign of a device under measurement based on measurement data received by the connection unit,
The radio measurement system according to claim 2, wherein the management unit manages a diagnosis result in the failure sign diagnosis unit. The wireless measurement system according to claim 3, wherein the management device generates a request to be sent to the wireless sensor terminal based on a diagnosis result of a failure sign in the failure sign diagnosis unit. The failure sign diagnosis unit of the management device diagnoses that there is a failure sign when there is a change in the same period in the measurement data of the radio wave condition and the measurement data of the vibration state received by the connection unit. 4. The wireless measurement system according to 4. The diagnosis is performed by the failure sign diagnosis unit of the management device by adding the generation period or the power supply period of the measurement data of the radio wave condition as a unit, and making a diagnosis from the added data. Wireless measurement system. The data transmitted from the communication unit of the wireless sensor terminal is received, the received data is transmitted to the connection unit of the management device, and the request based on an instruction from the management device is transmitted to the communication unit of the wireless sensor terminal The wireless measurement system according to claim 4 , further comprising a mobile station that transmits to the mobile station. The wireless sensor terminal includes a failure sign diagnosis unit that diagnoses a failure sign of a device under measurement based on measurement data stored in the memory,
The radio measurement system according to claim 1, wherein data of a diagnosis result diagnosed by the failure sign diagnosis unit is stored in the memory, and data of a diagnosis result stored in the memory is transmitted to the management device. A radio wave condition measurement unit for measuring the radio wave condition in the device under measurement;
A vibration measuring unit for measuring a vibration state of the device to be measured;
Measurement data of the radio wave situation measured by the radio wave situation measurement unit and measurement data of the vibration situation measured by the vibration measurement unit, or a memory storing analysis data of these measurement data;
A communication unit that receives an external signal and transmits data stored in the memory;
A wireless sensor terminal comprising: a control unit that performs control to transmit data stored in the memory based on a signal received by the communication unit. A device management method applied to a wireless measurement system including a wireless sensor terminal installed in a device to be measured and a management device that manages the device to be measured by data transmitted from the wireless sensor terminal. ,
The wireless sensor terminal is
Radio wave condition measurement processing for measuring the radio wave condition in the device to be measured;
Vibration measurement processing for measuring the vibration status of the device to be measured;
A storage process for storing measurement data of the radio wave condition measured by the radio wave condition measurement process, measurement data of the vibration condition detected by the vibration measurement process, or analysis data based on these measurement data;
A communication process for receiving a signal from the outside and transmitting the data stored in the storage process;
A control process for performing control to transmit the measurement data or the analysis data stored in the storage process in the communication process based on the signal received in the communication process;
The management device
A connection process for receiving data transmitted by the wireless sensor terminal;
A management process for managing the device under measurement based on the data received in the connection process;
Device management method.

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