JP6407553B2 - Condition monitoring system - Google Patents

Description

  The present invention relates to a state monitoring system, and more particularly to a state monitoring system that monitors the state of a wind turbine generator.

  In a wind power generator, power is generated by rotating a main shaft connected to a blade that receives wind power, rotating the main shaft with a speed increaser, and then rotating a rotor of the power generator. In order to diagnose abnormalities of the main shaft, speed increaser, generator, etc., a technique is known in which vibration is measured using a vibration sensor and the state of the wind power generator is diagnosed from the measured value.

  For example, a portable vibration diagnostic device disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2012-98149) receives a plurality of vibration sensor units and radio signals received from the vibration sensor units to diagnose a device. A diagnostic unit.

JP 2012-98149 A

  In Patent Document 1, the measurement value of the vibration sensor is wirelessly transmitted, but communication may be interrupted depending on a communication environment such as a radio wave condition. However, since Patent Document 1 does not take measures against the problem, an appropriate diagnosis cannot be made depending on the communication environment.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a state monitoring system capable of appropriately monitoring the state of a wind turbine generator.

  According to one aspect of the present invention, a state monitoring system for monitoring a state of a device provided in a wind turbine generator includes a wireless measurement unit including a sensor provided in the device for detecting the state, a wireless measurement unit, and wireless communication A wireless measurement unit, a memory that stores measurement data acquired from a sensor, a wireless communication unit that communicates with the data collection device, and a control unit that controls each part of the wireless measurement unit. In addition, when the wireless communication unit receives a request from the data collection device, the control unit transmits a data group including a predetermined number of the plurality of measurement data stored in the memory by the wireless communication unit.

  Preferably, the request includes a request data number indicating the number of measurement data requested to be received, and the predetermined number is indicated by a request data number included in the received request.

  Preferably, the data collection device includes a reception determination unit that determines whether or not data can be received from the wireless measurement unit in response to the request, and when the reception determination unit determines that the data cannot be received, the wireless measurement unit The request is sent again.

  Preferably, the device includes a bearing that supports a shaft communicating with the windmill, and the bearing has an inner ring through which the shaft passes and an outer ring provided on an outer periphery of the inner ring, and one of the inner ring and the outer ring is a windmill. In conjunction with the rotation, it rotates concentrically around the axis, and the other one is fixed, and the wireless measurement unit including the sensor is provided on at least one of the inner ring and the outer ring.

  According to the present invention, it is possible to appropriately monitor the state of the wind turbine generator.

It is the figure which showed roughly the whole structure of the state monitoring system of this Embodiment. It is the figure which showed schematically the structure of the wind power generator of this Embodiment. It is a figure explaining the attachment aspect of the radio | wireless measurement unit of this Embodiment. It is a figure explaining the structure and communication aspect of the radio | wireless measurement unit of embodiment of this invention. It is a block diagram which shows an example of a structure of the data collection device of embodiment of this invention. It is a figure which shows an example of the packet for communication of embodiment of this invention. It is a flowchart which shows the communication sequence of embodiment of this invention, and a related process.

  Hereinafter, the state monitoring system according to the present invention and related portions will be described with reference to the drawings. In the drawings, the same reference numerals represent the same or corresponding parts, and redundant description may not be repeated.

<Overall configuration of status monitoring system>
FIG. 1 is a diagram schematically showing the overall configuration of the state monitoring system of the present embodiment. Referring to FIG. 1, the state monitoring system that monitors the operation state of the wind turbine generator 10 includes a data collection device 80, a data server 330, and one or more monitoring terminals 340 that correspond to the monitoring data collection device. Prepare. The data collection device 80, the data server 330, and the monitoring terminal 340 communicate via wired and wireless communication paths including the Internet 320.

  The data collection device 80 communicates wirelessly with a wireless measurement unit 70 (FIG. 4) described later. The wireless measurement unit 70 has a vibration sensor 70A connected by a wired cable, and the data collection device 80 has a vibration sensor 70B connected by a wired cable. As a wireless communication method between the data collection device 80 and the wireless measurement unit 70, a wireless LAN (Local Area Network) can be used.

  Further, each monitoring terminal 340 corresponding to a personal computer (hereinafter also referred to as a personal computer) has a function of browsing the measurement data received by the data server 330 via the Internet 320, a detailed analysis function of the measurement data, and a data server 330. The function of changing the setting of the data collection device 80, the function of displaying the status of each device of the wind turbine generator 10, and the like. The monitoring terminal 340 includes a fixed terminal and a portable terminal that is a moving body.

  In the present embodiment, since the data collection device 80 and the wireless measurement unit 70 are connected by wireless communication, it is not necessary to wire an expensive sensor cable, and only a necessary power cable is required.

  The data collection device 80 receives measurement data of the two vibration sensors 70A from the wireless measurement unit 70 and processes the data. Specifically, a diagnostic parameter such as an effective value is calculated from the measurement data of the vibration sensor 70A, and is transmitted to the data server 330 together with time series data. The data server 330 determines whether or not the data received from the data collection device 80 exceeds the corresponding threshold (that is, whether or not the bearing is damaged). The determination result is transmitted to the monitoring terminal 340 or the like.

<Configuration of wind turbine generator 10>
FIG. 2 is a diagram schematically illustrating the configuration of the wind turbine generator 10. FIG. 3 is a view for explaining an attachment mode of the wireless measurement unit 70. The wind power generator 10 is a type (synchronous type) windmill in which a main bearing 60 described later and a generator 50 as a power generation unit are integrated. Referring to FIGS. 2 and 3, the wind power generator 10 includes a main shaft 20, a blade 30, a gear box 40 corresponding to a speed increaser, a generator 50, and a main bearing 60. Furthermore, the wind power generator 10 includes vibration sensors 70A and 70B and a data collection device 80. The gear box 40, the generator 50, the main bearing 60, the vibration sensors 70 </ b> A and 70 </ b> B, and the data collection device 80 are stored in the nacelle 90, and the nacelle 90 is supported by the tower 100.

  The main shaft 20 enters the nacelle 90, is connected to the input shaft of the gear box 40, and is rotatably supported by the main bearing 60. The main shaft 20 transmits the rotational torque generated by the blade 30 corresponding to the windmill receiving the wind force to the input shaft of the gear box 40. The blade 30 is provided at the tip of the main shaft 20 and converts wind force into rotational torque and transmits it to the main shaft 20.

  The main bearing 60 (outer ring, inner ring, rolling element) is fixed in the nacelle 90 and rotatably supports the main shaft 20. The main bearing 60 includes a fixed (non-rotating) inner ring 64 through which the main shaft 20 passes, an outer ring provided around the inner ring 64, and a rolling element 61 (FIG. 3). The rolling element 61 is disposed between the inner ring 64 and the outer ring. The outer ring is formed integrally with the main shaft 20 and rotates concentrically around the main shaft 20 in conjunction with the rotation of the main shaft 20. The main bearing 60 is constituted by, for example, a self-aligning roller bearing, a tapered roller bearing, a cylindrical roller bearing, or a ball bearing. These bearings may be single row or double row.

  The gear box 40 is provided between the main shaft 20 and the generator 50, and increases the rotational speed of the main shaft 20 to output to the generator 50. The generator 50 is connected to the output shaft of the gear box 40 and generates electric power by the rotational torque received from the gear box 40. The generator 50 is configured by, for example, an induction generator.

(Mounting mode)
With reference to FIG. 3, in this Embodiment, the wireless measurement unit 70 is cable-connected to the slip spring 701 which is a power supply part, and is supplied with electric power. The vibration sensor 70 </ b> A is supplied with power from the wireless measurement unit 70. The wireless measurement unit 70 and the vibration sensor 70A are attached to the outer ring side of the main bearing 60. That is, when there is no place for attaching the vibration sensor on the inner ring 64 side of the main bearing 60, or when the vibration sensor cannot be replaced on the inner ring 64 side, the vibration sensor 70A and the wireless measurement unit 70 are attached to the rotating outer ring side. Vibration measurement is possible. For example, in an outer ring rotating type wind power generator, the main bearing 60 is configured by inner ring fixing and outer ring rotation, and it may be difficult to attach a vibration sensor to the inner ring side. In such a case, as shown in FIG. 3, the wireless measurement unit 70 and the vibration sensor 70 </ b> A are attached to the outer ring side of the main bearing 60.

  Here, the wireless measurement unit 70 and the vibration sensor 70A are attached to the outer ring side, but the present invention is not limited to this.

  As shown in the drawing, the main bearing 60 that supports the shaft communicating with the wind turbine has an inner ring 64 through which the shaft passes and an outer ring provided on the outer periphery of the inner ring 64. One of the inner ring 64 and the outer ring rotates concentrically around the axis in conjunction with the rotation of the windmill, and the other is fixed. The vibration sensor 70A and the wireless measurement unit 70 may be provided on at least one of the inner ring 64 and the outer ring.

(Configuration and communication mode of wireless measurement unit 70)
FIG. 4 is a diagram for explaining the configuration and communication mode of the wireless measurement unit 70 according to the embodiment of the present invention. 4A, in the nacelle 90, there are two vibration sensors 70A, a wireless measurement unit 70 that receives an output from the vibration sensor 70A, an antenna 81 connected to the wireless measurement unit 70, a wireless LAN ( A data collection device 80 that communicates with an access point 82 corresponding to a repeater of the Local Area Network and a wireless measurement unit 70 is provided. In the figure, a broken line indicates a wireless communication path, and a solid line indicates a wired communication path such as a cable.

  The data collection device 80 is connected to the antenna 81 and the access point 82 via a wireless LAN, and the access point 82 and the data server 330 are connected via a wired or wireless LAN.

  The data collection device 80 communicates with the access point 82 by wire or wireless. Therefore, the wireless measurement unit 70 and the data collection device 80 communicate via the access point 82.

  The wireless measurement unit 70 includes an input channel 71 that receives measurement data (analog signals) output from the two vibration sensors 70A, a filter 72 that removes noise components and the like from the measurement data received by the input channel 71, and a filter 72. A gain unit 73 that amplifies the output and an A / D (Analog / Digital) conversion unit 74 that converts the analog amount output from the gain unit 73 into digital data are provided. Further, a CPU (Central Processing Unit) 75 having a function of processing measurement data after conversion into digital data and a wireless LAN (Local Area Network) module 77 corresponding to a wireless communication unit are provided. The wireless LAN module 77 includes a modem (modulation / demodulation) and the like. The CPU 75 connects a memory 76 corresponding to a nonvolatile or volatile storage area for storing data, and a timer 78. The memory 76 includes a storage area 79 corresponding to a flash memory for storing (storing) vibration measurement data received from the vibration sensor 70A.

  The CPU 75 corresponds to a control unit that controls each unit of the wireless measurement unit 70, and each unit is controlled by a signal (command) / data from the CPU 75.

  The input channel 71 inputs measurement data from the two vibration sensors 70 </ b> A by channel switching according to a control signal from the CPU 75. As described above, since the input channel 71 of the wireless measurement unit 70 has a multi-channel configuration, the sensor cable usage length is reduced and the number of wirings is also reduced, so man-hours for installing the device in the nacelle 90 are reduced. Less. In addition, the reduction in the number of work steps in the nacelle 90 shortens the work time, and also shortens the time during which the wind turbine generator 10 is stopped. As a result, a decrease in the amount of power generated by the wind turbine generator 10 can be suppressed.

(Data collection mode of the wireless measurement unit 70)
The wireless measurement unit 70 transmits vibration measurement data to the data collection device 80 by wireless communication. The wireless measurement unit 70 stores the measurement data from the vibration sensor 70A with identification data in the storage area 79. For example, the measurement data input in time series is stored in order in the array area secured in advance in the storage area 79. A subscript (for example, a numerical value) of the array corresponding to the measurement data (array element) stored in the array corresponds to identification data of the measurement data. Note that the method of providing identification data is not limited to this. Therefore, the order in which the corresponding measurement data is measured can be indicated by the subscript value indicated by the identification data.

  The wireless measurement unit 70 transmits the measurement data in the storage area 79 for each group divided into a plurality of groups (groups). A group consists of one or more pieces of measurement data. Here, this group is referred to as a block. Specifically, the wireless measurement unit 70 searches for and transmits a block of data corresponding to an identification number (identification data) designated from the data collection device 80. The data size of each divided block is smaller than that of all measurement data. Therefore, the connection maintenance time of the wireless line required between the wireless measurement unit 70 and the data collection device 80 can be shortened to a maintenance time in which one block can be transmitted, and the connection maintenance time can be secured. It becomes easy. The wireless measurement unit 70 can transmit all measurement data obtained by the vibration sensor 70 </ b> A to the data collection device 80 by repeating data transmission of each divided block.

  In the present embodiment, the writing and reading of the measurement data in the storage area 79 are not performed simultaneously (in parallel) but with a time difference. Specifically, in order to ensure acquisition (storage) of measurement data, all vibration measurement data received from the vibration sensor 70 </ b> A during measurement is stored in the storage area 79. At the time of subsequent transmission, the measurement data is read from the storage area 79 and transmitted to the data collection device 80 in units of blocks as described above. Thereby, acquisition of all measurement data (storage in the storage area 79) can be ensured, and the sampling rate of measurement data and the transmission rate to the data collection device 80 can be handled independently.

(Configuration of data collection device 80)
FIG. 5 is a block diagram showing an example of the configuration of the data collection device 80 according to the embodiment of the present invention. Referring to FIG. 5, the data collection device 80 includes an antenna 602 for receiving radio waves, a radio communication unit 700 for performing transmission / reception control and data processing via the antenna 602, an input / output unit 604, volatile or non-volatile. A data collecting unit 606 with a built-in memory, a DC power source 608 for supplying power to the wireless communication unit 700, and an I / F (abbreviation for InterFace) unit 601 for inputting and outputting with other sensors (not shown). . The input / output unit 604 controls data input / output between the data collection unit 606 and the CPU 704.

  The I / F unit 601 corresponds to a data acquisition unit that inputs vibration measurement data from the vibration sensor 70B connected by wire, and outputs the acquired data and information to the CPU 704 in the order of input (acquisition).

  The wireless communication unit 700 includes a wireless communication circuit unit 702, a timer 703, and a CPU (Central Processing Unit) 704. Radio communication circuit section 702 demodulates and A / D-converts the signal received from antenna 602, outputs the converted data to CPU 704, D / A-converts and modulates the data from CPU 704, and converts the converted data. Are transmitted via the antenna 602.

  When the wireless communication unit 700 receives a packet storing measurement data from the wireless measurement unit 70 (described later), the wireless communication unit 700 extracts data from the main body of the received packet, and the data collection unit via the input / output unit 604 The data is stored in the memory 606. Further, the measurement data of the vibration sensor 70B input via the I / F unit 601, that is, preferably the time data of the timer 703 is associated with the time data of the timer 703 according to the measurement order, and stored in the memory of the data collection unit 606 via the input / output unit 604. Store.

  In addition, the wireless communication unit 700 reads data (measurement data) from the memory of the data collection unit 606 via the input / output unit 604, and reads the read data via the antenna 602, for example, in the form of a packet. Transmit to the device (data server 330 or the like).

  The data server 330 stores the data received from the data collection device 80 in a predetermined memory, processes the data, and transmits the data to the monitoring terminal 340. Further, the monitoring terminal 340 processes the measurement data received from the data server 330 in which the measurement data received from the data collection device 80 is accumulated, and outputs the monitor data (display, etc.). The user can monitor the operation state such as vibration of the wind turbine generator 10 from the monitor display.

(Composition of communication packet)
FIG. 6 is a diagram showing an example of a communication packet according to the embodiment of the present invention. Referring to FIG. 6A, packet PA basically includes a header portion HE and a main body DB. The header portion HE includes information (address etc.) for identifying the destination and transmission source of the packet, and the main body portion DB includes data to be transmitted.

  The wireless measurement unit 70 and the data collection device 80 communicate with each other using the packet PA, but the wireless measurement unit 70 stores the identification information to be stored in the header portion HE in the memory 76 in advance. Is stored in a memory (not shown) accessible by the CPU 704. A frame may be used instead of the packet.

  FIG. 6B shows a request packet PAQ for the data collection device 80 to request the wireless measurement unit 70 to transmit measurement data. A transmission request command is stored in the main body DB of the packet PAQ.

  FIG. 6C shows a response packet PAR transmitted from the wireless measurement unit 70 to the data collection device 80, and a response command for the request packet PAQ is stored in the main body DB of the packet PAR.

(Data transmission)
In the wind power generator state monitoring system according to the present embodiment, the wireless measurement unit 70 divides the measurement data in the storage area 79 into a plurality of blocks each consisting of one or more measurement data, and requests one request. When the packet PAQ is received, one of the block data is transmitted. All measurement data can be transmitted to the data collection device 80 by repeating reception of the request packet PAQ and transmission of block data by a plurality of blocks.

  Next, the wireless measurement unit 70 stores 1536000 pieces of data (sampling period: 25.6 kHz, measurement for 60 seconds, 1 data size is 2 bytes) stored in the storage area 79 at a transmission rate of 50000 Byte / sec (400000 bps). In the case where the transmission buffer size of the wireless measurement unit 70 is 1100 bytes and the reception buffer size of the data collection device 80 is 2048 bytes, the batch transmission of all measurement data and the divided transmission in block units will be described. To do.

  In the case of batch transmission, the data reception time required for 1536000 × 2 (bytes) = 3072000 bytes is 3072020/5000 = 61.4404 sec.

  Request command count from the data collection device 80: Request command processing overhead time per time: 2 msec / time, and request command processing overhead time: 0.002 × 1 = 0.002 sec.

  Further, the number of response transmissions to the request command of the wireless measurement unit 70: transmission overhead per time: 2 msec / time, and transmission overhead time: 0.002 × 1 = 0.002 sec.

  Since the transmission buffer size on the wireless measurement unit 70 side is 1100 bytes, the number of data transmissions from the wireless measurement unit 70 to the data collection device 80 is 3072020/1100 = 2793 times.

  Therefore, when the data collection device 80 transmits a request command once, data transmission from the wireless measurement unit 70 is repeated 2793 times. If the data collection device 80 is not able to receive the transmission data and the data transmission is interrupted, in the case of batch transmission, the data collection device 80 requests the wireless measurement unit 70 to transmit the interrupted data at the time of the interruption. It is not possible.

  Regarding the transmission time required for batch transmission, the number of receptions is 2,793, the reception overhead per one: 2 msec / time, and the reception overhead time: 0.002 × 2793 = 5.586 sec. When a request command is transmitted after completion of batch transmission due to interruption, the number of request command response reception: 1 time, request command response processing overhead: 2 msec / time, and request command response processing overhead time: 0.002 × 1 = 0.002 sec.

  Therefore, in the case of batch transmission, the transmission time is 61.4404 + 0.002 + 0.002 + 5.586 + 0.002 = 67.0324 sec. Actually, a delay related to the CPU processing occurs, and it can be estimated to be about 70 seconds.

  With regard to the transmission time required for divided transmission, if 512 data / blocks are required, (1536000 ÷ 512) = 3000 blocks need to be transmitted, so the number of request command transmissions is 3000 and the number of data receptions is 3000. .

  Therefore, the data transmission time is 61.4404 sec, the request command processing overhead time: 2 msec × 3000 = 6 sec, and the transmission overhead time: 2 msec × 3000 = 6 sec. Further, the reception overhead time: 0.002 × 3000 = 6 sec and the request command response processing overhead time: 0.002 × 3000 = 6 sec. As a result, in the case of divided transmission, the transmission time is 61.4404 + 6 + 6 + 6 + 6 = 85.4404, which can be estimated as about 85 seconds.

  Thus, in the case of divided transmission, the time required for all data transmission takes 85 seconds, but since the transmission time for one block is (85/3000) = 0.028 seconds, only a short wireless communication connection maintaining time can be secured. Even if this is the case, it is possible to reliably transmit data in units of blocks.

  Here, in consideration of the wireless communication connection maintenance time possible between the data collection device 80 and the wireless measurement unit 70, the overhead time required for request command transmission, etc., for example, 512 data / block is used. The number of data (size) is not limited to this.

(Processing flowchart)
FIG. 7 is a flowchart showing a communication sequence between the wireless measurement unit 70 and the data collection device 80 according to the embodiment of the present invention and processing related thereto. The processing according to this flowchart is realized by executing a program. The program on the wireless measurement unit 70 side is stored in the memory 76 in advance, and the CPU 75 reads and starts execution of the program in response to a measurement command command from the data collection device 80. The program on the data collection device 80 side is stored in advance in a memory (not shown) of the wireless communication unit 700. For example, when the power is turned on, the CPU 704 reads out the program and starts execution. Here, it is assumed that 512 pieces of data are transmitted per block.

  First, in the wireless measurement unit 70, the CPU 75 stores the measurement data from the vibration sensor 70A in the array of the storage area 79 based on the measurement command command received in advance (step S3). The stored measurement data is assumed to be measurement data for a sampling rate of 25600 Hz and one second. Therefore, 25600 pieces of measurement data are stored in the storage area 79.

  The CPU 704 of the data collection device 80 generates and transmits a packet PAQ (step S7). The packet PAQ request command includes “1 to 512” as an identification number for designating measurement data for which transmission is requested.

  When receiving the packet PAQ (step S9), the CPU 75 of the wireless measurement unit 70 generates a packet PAR and transmits it as a reply (step S11). The response command of the main body DB of this packet PAR includes the identification numbers “1 to 512” read from the request command received in step S9.

  The CPU 74 of the data collection device 80 performs a packet PAR reception process (step S13), and determines whether or not it has been received (step S15). Specifically, when it is determined that the packet PAR has not been received or has been received but the identification number of the response command does not match the identification number of the request command transmitted immediately before (NO in step S15), The process returns to step S7 to transmit the request command again.

  On the other hand, if it is determined that the packet PAR has been received (YES in step S15), the CPU 75 generates and transmits a packet PA in which the data transmission command is stored in the main body DB (step S17). This data transmission command includes the identification number “1 to 512” of the packet PAQ transmitted immediately before.

  The CPU 75 of the wireless measurement unit 70 receives a data transmission command from the data collection device 80 (step S19). Then, the storage area 79 is searched based on the received identification number “1 to 512”, 512 pieces of measurement data matching the identification number are read from the array, and 512 pieces of read measurement data (the identification number is assigned). The packet PA having the state stored in the main body DB is generated and transmitted to the data collection device 80 (step S21).

  The CPU 704 of the data collection device 80 receives the packet PA that stores the measurement data (step S23). The received measurement data is stored in the memory of the data collection unit 606.

  The CPU 704 of the data collection device 80 determines whether or not all of the measurement data instructed to be collected by the measurement command command has been received from the wireless measurement unit 70 (step S25). Specifically, the value of the identification number assigned to the measurement data received in the immediately preceding step S23 and the value 1 indicating the total number of measurement data (25600 Hz and 25600 measurement data for one second) indicated by the measurement command command Compare ~ 25600. If it is determined that “25600” is included in the value of the identification number of the measurement data received immediately before based on the comparison result, it is determined that all data has been received (YES in step S25), and the process ends.

  On the other hand, if it is determined that “25600” is not included in the value of the identification number of the measurement data received immediately before based on the comparison result, it is determined that all data has not been received yet (NO in step S25). Return to step S7.

  In step S7, in order to receive the measurement data of the next block, that is, the identification number “513 to 1024” from the wireless measurement unit 70, a packet storing a request command including the identification number “513 to 1024” of the next block. A PAQ is generated and transmitted by the wireless measurement unit 70 (step S7). Thereafter, the same communication process as described above is performed on the measurement data of the next block.

  As described above, until it is determined that all measurement data has been received (YES in step S25), measurement data transmission in units of one block in steps S7 to S23 is repeated, and a request command for designating a transmission target block is received. Even if the wireless communication connection condition is not good (wireless communication connection time is shortened) by repeating the request command retransmission until the response command can be normally received (repeating steps S7 to S15), All blocks (all measurement data) can be transmitted.

(Modification)
Here, the measurement data by the vibration sensor 70A is collected to monitor the vibration as the state of the device provided in the wind turbine generator 10, but the state of the device is not limited to vibration. Therefore, the sensor for detecting the state is not limited to the vibration sensor.

  In addition, although a block is configured with 512 data, the number of data to be configured is not limited to 512. Further, although 512 data is always requested by the request packet PAQ transmitted by the data collection device 80, the number of data requested by each request packet PAQ may be variable.

(Effects of the embodiment)
The wireless measurement unit 70 installed on the rotating body may move to a position where radio waves are blocked by rotating itself with the rotating body, and the data length per transmission is long (data amount) In many cases, there is a possibility that the measurement data cannot be transmitted without securing the necessary wireless communication connection maintenance time.

  In contrast, in the present embodiment, the measurement data is divided into a plurality of blocks and transmitted in units of blocks, thereby reducing the required wireless communication connection maintenance time to a time during which one block can be transmitted. Can do. Therefore, even if the wireless measurement unit 70 moves to a position where the radio wave is blocked by the rotation as described above, all blocks (all measurement data) can be reliably transmitted.

  The embodiment disclosed this time should be considered as illustrative in all points 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.

10 wind power generator, 70 wireless measurement unit, 70A vibration sensor, 79 storage area, 80 data collection device, PA packet, PAQ request packet, PAR response packet.

Claims (3)

A state monitoring system for monitoring the state of equipment provided in a wind turbine generator,
A wireless measurement unit including a sensor provided in the device for detecting a state;
A data collection device that wirelessly communicates with the wireless measurement unit;
The wireless measurement unit is
A memory for storing measurement data acquired from the sensor;
A wireless communication unit communicating with the data collection device;
A control unit for controlling each part of the wireless measurement unit,
The controller is
When the wireless communication unit receives a request from the data collection device, the wireless communication unit transmits a data group consisting of a predetermined number of measurement data stored in the memory, and the request is received. Including the number of requested data indicating the number of measurement data requested
The state monitoring system, wherein the predetermined number is indicated by the number of request data included in the received request . The data collection device includes:
Including a reception determination unit that determines whether data can be received from the wireless measurement unit in response to the request;
When it is determined not to be received by the reception determination unit transmits the request again to the radio measurement unit, the state monitoring system according to claim 1. The apparatus includes a bearing that supports a shaft communicating with the windmill,
The bearing has an inner ring through which the shaft passes, and an outer ring provided on the outer periphery of the inner ring,
One of the inner ring and the outer ring rotates concentrically around the axis in conjunction with the rotation of the windmill, and the other is fixed,
The state monitoring system according to claim 1 or 2 , wherein the wireless measurement unit including the sensor is provided in at least one of the inner ring and the outer ring.

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