Facility monitoring system and facility monitoring method

Abstract

The present invention preemptively prevents the occurrence of an incident such as a blackout by efficiently monitoring the approach and contact of an object such as machinery to a power transmission facility. This facility monitoring system: acquires, by distributed acoustic sensing (DAS), a temporal change in vibration intensity for each frequency in an optical fiber attached along a power transmission line, at measurement points set along the optical fiber; extracts, as an object approach span, a span having a measurement point at which the temporal change in vibration intensity for each frequency includes a mode caused by a sound wave emitted from an object present in the vicinity of the measurement point; and generates information indicating the extracted object approach span. The facility monitoring system also determines, on the basis of whether the temporal change in the vibration intensity for each frequency at the measurement point in the object approach span includes a mode caused by contact with the power transmission facility, whether the object has come into contact with the power transmission facility.

Description

Facility monitoring system and facility monitoring method

[0001] The present invention relates to a facility monitoring system and a facility monitoring method.

[0002] Patent Document 1 describes an abnormality detection device that acquires backward Rayleigh scattered light from an OPGW (optical fiber composite overhead ground wire), generates vibration information for a frequency range including the natural frequency of the optical fiber composite overhead ground wire based on the acquired backward Rayleigh scattered light, and detects abnormalities in power transmission equipment based on the generated vibration information.

[0003] Patent document 2 describes a method of calculating the distance in the line direction of the overhead power line from the imaging means to a moving object based on two-dimensional position data and the separation distance and focal length of each imaging means, setting a danger area on a plane that is approximately perpendicular to the overhead power line at the position of the moving object at the obtained distance, and issuing an alarm when the moving object enters this danger area.

[0004] JP-A No. 2023-50257 JP-A No. 3-89103

[0005] At power transmission and transformation facilities such as power lines, transmission towers, and substations, patrols and inspections are carried out from time to time using equipment such as drones and patrol helicopters to maintain the facilities. Furthermore, heavy machinery, including equipment unrelated to the power transmission facilities, is sometimes used for work around the facilities. To ensure safety during such work, the manager of the power transmission facility and the person carrying out the work usually confirm and agree on matters such as the equipment to be used (drones, patrol helicopters, heavy machinery, etc.) and the distance to be maintained from the power transmission facilities during work in advance.

[0006] However, for some reason, work using equipment near power transmission facilities may be carried out without notifying the facility manager in advance. In such cases, even if the power transmission facilities are damaged by contact with the equipment, the incident may not be discovered, or the facility manager may not be notified in time, leading to an accident such as a power outage.

[0007] The present invention has been made in consideration of the above background, and aims to provide an equipment monitoring system and an equipment monitoring method that can monitor the approach or contact of objects such as equipment with power transmission equipment and prevent accidents such as power outages from occurring.

[0008] One means for solving the above problem is an equipment monitoring system comprising an optical analysis unit and an information processing device, which acquires the time change in vibration intensity for each frequency of an optical fiber at measurement points set along an optical fiber attached to a power transmission line using DAS (Distributed Acoustic Sensing), extracts spans having the measurement points where the time change in vibration intensity for each frequency includes aspects caused by sound waves emitted from an object located near the measurement points, as object approach spans, and generates information indicating the extracted object approach spans.

[0009] Other problems and solutions disclosed in the present application will be made clear in the detailed description and drawings.

[0010] According to the present invention, it is possible to monitor the approach or contact of objects such as equipment to power transmission facilities, and to prevent accidents such as power outages from occurring.

[0011] FIG. 1 is a diagram showing a schematic configuration of an equipment monitoring system. FIG. 2 is a diagram explaining a mechanism for measuring vibration conditions using a DAS. FIG. 3 is a diagram showing the trajectory of a patrol helicopter flying along a power transmission line. FIG. 4 is an example of temporal changes in vibration intensity for each frequency of an optical fiber. FIG. 5 is a diagram showing the main configuration of an equipment monitoring device. FIG. 6 is a diagram showing the main functions of the equipment monitoring device. FIG. 7 is a flowchart explaining equipment monitoring processing. FIG. 8 is an example of an object approach information presentation screen.

[0012] The present invention will be described below in accordance with one embodiment with reference to the accompanying drawings. At least the following matters will become clear from the description of this specification and the accompanying drawings. In the following description, the letter "S" added before a reference numeral means a processing step.

[0013] 1 shows a schematic configuration of an equipment monitoring system 1 according to an embodiment of the present invention. The equipment monitoring system 1 includes an equipment monitoring device 100 provided in a substation 6 or the like, and a work schedule management device 300.

[0014] The equipment monitoring device 100 is configured using an information processing device (computer). The equipment monitoring device 100 is communicably connected to the work schedule management device 300 via a communication network (not shown). The communication network may be, for example, a local area network (LAN), a wide area network (WAN), the internet, a power line communication (PLC), a public communication network, a dedicated line, or the like.

[0015] The equipment monitoring device 100 uses an optical fiber 4a of an optical fiber composite overhead ground wire (OPGW4) installed on the power transmission line 3 as a vibration detection sensor, and acquires the vibration state at each of a plurality of measurement positions (hereinafter referred to as "measurement points") set along the optical fiber 4a by a technique (distributed acoustic sensing (DAS)) that measures the vibration state (vibration intensity, vibration frequency) based on the expansion and contraction of the optical fiber 4a at each of the measurement points. The DAS acquires the vibration state at each measurement point by, for example, the principle of a coherent detection optical time domain reflectometer (C-OTDR).

[0016] FIG. 2 illustrates how the equipment monitoring device 100 measures the vibration state at each measurement point using a DAS. As shown in the figure, the equipment monitoring device 100 emits a light pulse (laser pulse, hereinafter also referred to as "incident light") through the end face of the optical fiber 4a and measures the rate of change (≈stretching frequency) of the phase difference of the backscattered light of the light pulse at each measurement point. The phase difference is estimated from the intensity change due to interference between the backscattered lights. Based on the measured rate of change, the equipment monitoring device 100 then determines the vibration frequencies (e.g., vibration frequencies in the range of up to 10 kHz) of the longitudinal and transverse waves of the optical fiber 4a at each measurement point. The equipment monitoring device 100 also determines the vibration intensity (spectral intensity, vibration amplitude) at each measurement point based on the phase difference for each vibration frequency. The equipment monitoring device 100 also determines the position (distance from the end face) of each measurement point based on the elapsed time between when the incident light is incident on the end face and when the returned light is received.

[0017] The measurement points are set, for example, along the optical fiber at predetermined intervals d (m) that are shorter than the span of the transmission tower 2 (0 (m), d (m), ..., N (m), N + d (m), N + 2 d (m)). For example, as shown in Figure 1, if the predetermined interval d is 5 (m) and measurement points are set over a maximum range of 70 (km) of the transmission line 3, approximately 14,000 measurement points will be set along the optical fiber.

[0018] The vibration state at each measurement point includes a vibration state caused by sound waves emitted from objects present in the vicinity of the power transmission facility (such as the transmission tower 2, the transmission line 3, and the substation 6). The facility monitoring device 100 acquires information about objects present in the vicinity of the power transmission facility based on the vibration state at each measurement point.

[0019] Returning to FIG. 1 , the work schedule management device 300 manages information about schedules of work to be performed in the vicinity of power transmission equipment (hereinafter referred to as "work schedule 311") in a database. Work to be managed includes, for example, patrols and inspections of power transmission equipment, replacement and expansion work of power transmission equipment, and various types of work performed in the vicinity of power transmission equipment (including work unrelated to power transmission equipment). The work schedule management device 300 provides the contents of the work schedule 311 to the equipment monitoring device 100. The work schedule 311 is registered in and managed in the database by, for example, the manager of the power transmission equipment.

[0020] Next, we will explain the relationship between sound waves emitted from objects (drones, patrol helicopters, heavy machinery, etc.) located near the power transmission equipment and the time change in frequency of the vibration state of each measurement point acquired by the equipment monitoring device 100 using DAS.

[0021] 3A is an example of the flight trajectory of a patrol helicopter flying along a power transmission line 3 for patrol inspection work. The figure shows on a map the flight path (flight trajectory) of the patrol helicopter when it flies along the power transmission towers 2 with identifiers (hereinafter referred to as "tower IDs") of "58" to "68."

[0022] Figure 3B is a graph showing the time change in the vibration state at each measurement point for each frequency, acquired by the equipment monitoring device 100 using the DAS when the patrol helicopter flew along the route shown in Figure 3A. Each of the three graphs shows the time change in vibration intensity for each frequency of the optical fiber 4a, measured at a specific measurement point for each span with an identifier (hereinafter referred to as "span ID") of "61_62," "62_63," or "63_64." In each graph, time flows from top to bottom on the page. The shades of color in the figure represent the vibration intensity (in arbitrary units) for each frequency (the lighter the color, the greater the vibration intensity).

[0023] As shown in the figure, each graph shows strong vibration intensities caused by sound waves (blade slap, engine noise, etc.) emitted from the patrol helicopter near the frequencies of 24 Hz (fundamental wave), 48 Hz (second harmonic), and 72 Hz (third harmonic). Furthermore, the strong vibration intensities in each graph are observed with a time lag due to the patrol helicopter moving along the power transmission line 3.

[0024] The time variation of vibration intensity for each frequency at each measurement point acquired by the DAS exhibits a pattern resulting from sound waves emitted from objects such as equipment located near each measurement point. Based on this pattern in the time variation of vibration intensity for each frequency at each observed measurement point, it is possible to identify spans near which objects exist (hereinafter referred to as "object approach spans").

[0025] Furthermore, the time variation of the vibration intensity for each frequency at each measurement point acquired by the DAS reveals a pattern resulting from an object coming into contact with the power transmission equipment near each measurement point. Therefore, based on the above pattern in the time variation of the vibration intensity for each frequency at each observed measurement point, it is possible to determine whether an object is coming into contact with the power transmission equipment.

[0026] From the above perspective, the equipment monitoring device 100 acquires information about objects present in the vicinity of the power transmission equipment based on the time-varying changes in the vibration state for each frequency acquired at the measurement points of each span, and provides the acquired information to the manager of the power transmission equipment.

[0027] 4A is a diagram showing the main configuration of the equipment monitoring device 100. As shown in the figure, the equipment monitoring device 100 includes a processor 101, a main storage device 102 (memory), an auxiliary storage device 103 (external storage device), an input device 104, an output device 105, a communication device 106, and an optical analysis unit 107. These are communicatively connected via a bus, a communication cable, or the like. Note that all or part of the equipment monitoring device 100 may be realized using virtual information processing resources, such as a virtual server provided by a cloud system, for example.

[0028] The processor 101 is configured using, for example, a CPU (Central Processing Unit), an MPU (Micro Processing Unit), a GPU (Graphics Processing Unit), an FPGA (Field Programmable Gate Array), an ASIC (Application Specific Integrated Circuit), an AI (Artificial Intelligence) chip, etc.

[0029] The main memory device 102 is a memory device used when the processor 101 executes a program, and is, for example, a read-only memory (ROM), a random access memory (RAM), or a non-volatile memory (NVRAM).

[0030] The auxiliary storage device 103 is a device that stores programs and data, and can be configured, for example, with an SSD (Solid State Drive), a hard disk drive, or an optical storage device (CD (Compact Disc), DVD (Digital Versatile Disc), etc.). Programs and data can be read into the auxiliary storage device 103 from other information processing devices equipped with non-transitory recording media or non-transitory storage devices via a recording medium reading device or a communication device 106. The programs and data stored in the auxiliary storage device 103 are read into the main storage device 102 as needed.

[0031] The input device 104 is an interface that accepts input of information from the outside, and is, for example, a keyboard, a mouse, a touch panel, a voice input device, or the like.

[0032] The output device 105 is an interface that outputs various information such as processing progress and processing results to the outside. The output device 105 is, for example, a display device (liquid crystal monitor, LCD (Liquid Crystal Display) or the like) that visualizes the various information, a device that converts the various information into audio (audio output device (speaker or the like)), or a device that converts the various information into text (printer or the like). Note that, for example, the information processing device 10 may be configured to input and output information to and from other devices via the communication device 106.

[0033] The input device 104 and the output device 105 constitute a user interface that realizes interactive processing with the user (receiving information, providing information, etc.).

[0034] The communication device 106 is a device that realizes communication with other devices via a communication network (such as a local area network (LAN), a wide area network (WAN), the Internet, a public communication network, or a dedicated line). The communication device 106 is a wired or wireless communication interface that realizes communication with other devices via a communication medium, such as a network interface card (NIC), a wireless communication module, or a universal serial bus (USB) module.

[0035] The optical analyzing unit 107 is a device that measures the vibration state of a measurement point using a DAS and includes a vibration measuring device using a C-OTDR and a signal processing circuit. The optical analyzing unit 107 includes a CW (continuous wave) laser light source that generates an optical pulse (laser light) to be input to the end face of the optical fiber 4a, an optical pulse generator, an optical amplifier, optical devices (photodetector, optical interferometer), a signal processing circuit (phase calculation circuit, etc.), etc. The optical analyzing unit 107 and the optical fiber 4a are connected, for example, by optically connecting the output of the laser light source of the optical analyzing unit 107 to a connection port (socket) of the core wire of an OPGW installed in a substation. Therefore, the connection does not cause any impact on the power system, such as a power outage.

[0036] The equipment monitoring device 100 may be equipped with, for example, an operating system, a file system, a DBMS (DataBase Management System) (relational database, NoSQL, etc.), a KVS (Key-Value Store), etc.

[0037] The various functions of the equipment monitoring device 100 are realized by the processor 101 reading and executing programs stored in the main memory device 102, or by the hardware (FPGA, ASIC, AI chip, etc.) that constitutes the equipment monitoring device 100. The equipment monitoring device 100 stores various types of information (data), for example, as tables in a database or files managed by a file system.

[0038] 4B is a block diagram illustrating the main functions of the equipment monitoring device 100. As shown in the figure, the equipment monitoring device 100 includes the following functions: a memory unit 110, a vibration state measurement unit 120, an object approaching span identification unit 125, a work schedule presence / absence determination unit 130, a confirmation instruction generation unit 132, a contact presence / absence determination unit 135, an equipment abnormality presence / absence determination unit 140, a response information generation unit 145, and an object approaching information presentation unit 150.

[0039] Of the above functions, the memory unit 110 stores vibration status for each measurement point 111, object approach span 112, work schedule 113, confirmation instructions 114, contact determination result 115, equipment abnormality determination result 116, response information 117, and power transmission equipment information 118.

[0040] The vibration state measurement unit 120 uses the DAS to measure the time-series data of the vibration state (vibration intensity, vibration frequency) at each measurement point on each span, and manages the measurement results as the vibration state for each measurement point 111. The vibration state for each measurement point 111 includes, for example, the information shown in each graph in FIG. 3B .

[0041] The object approaching span identifying unit 125 identifies an object approaching span based on the time change in vibration intensity for each frequency during the above-mentioned period at each measurement point managed in the vibration state for each measurement point 111. For example, when vibration intensity equal to or greater than a preset threshold is observed at the same frequency during the same time period at each measurement point of a plurality of adjacent spans, the object approaching span identifying unit 125 identifies these spans as object approaching spans. The object approaching span identifying unit 125 manages the span IDs of the identified object approaching spans as object approaching spans 112.

[0042] The work schedule determination unit 130 acquires the work schedule 311 for the period during which vibration intensity above the threshold is observed in the object approach span from the work schedule management device 300, and determines whether or not there is work scheduled to be carried out in the object approach span during the period (whether or not advance information about the work has been acquired).

[0043] When the work plan existence determination unit 130 determines that there is no work scheduled to be performed in the object approach span during the above-mentioned period (preliminary information has not been acquired), the confirmation instruction generation unit 132 generates a confirmation instruction including information that confirmation is required from the on-site worker, and manages the generated confirmation instruction as confirmation instruction 114 by associating it with the span ID of the object approach span.

[0044] The contact determination unit 135 determines whether or not an object has come into contact with the power transmission equipment based on the change over time in the vibration intensity for each frequency at the measurement point on the object approaching span during the above-mentioned period, and manages the determination result in association with the span ID as the contact determination result 115. For example, the contact determination unit 135 determines that an object has come into contact with the power transmission equipment when multiple vibration intensities equal to or greater than a preset threshold are observed at the same time at measurement points on spans adjacent to the object approaching span.

[0045] When the contact determination unit 135 determines that an object has come into contact with the power transmission equipment in the object approach span, the equipment abnormality determination unit 140 further determines whether an abnormality (such as a broken wire or partial deformation) has occurred in the power transmission equipment and manages the determination result in the equipment abnormality determination result 116. For example, the equipment abnormality determination unit 140 determines whether an abnormality has occurred in the power transmission equipment in the object approach span by comparing the natural frequency of the optical fiber 4a determined from the vibration intensity for each frequency at the measurement point in the object approach span after contact with the natural frequency of the optical fiber 4a determined from the vibration intensity for each frequency in the object approach span under normal conditions (before the object comes into contact) that have been stored in advance. For example, the equipment abnormality determination unit 140 determines that an abnormality has occurred in the power transmission equipment in the object approach span when a natural frequency different from the natural frequency under normal conditions is observed by a predetermined number or more.

[0046] The correspondence information generation unit 145 generates information indicating the object approach span with which the object came into contact and information indicating the action that the administrator should take for the object approach span (the power transmission equipment in the object approach span) (hereinafter referred to as "correspondence information"), and manages the generated correspondence information as correspondence information 117. The correspondence information generation unit 145 manages the correspondence information in correspondence with the span ID in power transmission equipment information 118, and generates correspondence information by comparing the span ID of the object approach span with the power transmission equipment information 118. Note that the power transmission equipment information 118 includes, in addition to the correspondence information, information on the tower ID and the power transmission equipment associated with the span ID (such as the position of the transmission tower 2, and information on the power transmission equipment installed in the vicinity of the transmission tower 2), and the correspondence information generation unit 145 adds this information to the correspondence information as necessary.

[0047] The object approaching information presentation unit 150 presents to the manager the contents of the confirmation instruction 114 and the contents of the response information 117. The object approaching information presentation unit 150 generates a screen (an object approaching information presentation screen 600, which will be described later) that lists, for example, the contents of the object approaching span 112, the contents of the work schedule 113, the contents of the confirmation instruction 114, the contents of the contact presence / absence determination result 115, the contents of the response information 117, and the like, and presents it to the manager.

[0048] 5 is a flowchart illustrating the processing performed by the equipment monitoring device 100 (hereinafter referred to as "equipment monitoring processing S500"). The equipment monitoring processing S500 will be described below with reference to FIG. It is assumed in the following description that the work scheduled to be performed on each span has been registered in advance in the work schedule management device 300. Furthermore, it is assumed that the vibration state measurement unit 120 of the equipment monitoring device 100 measures the time-varying vibration state (vibration intensity, vibration frequency) at each measurement point on each span in real time using a DAS, and manages the latest vibration state of each measurement point as the measurement-point vibration state 111.

[0049] As shown in the figure, the object approaching span specifying unit 125 monitors the vibration state for each measurement point 111 in real time (S511 to S512: No). When the object approaching span specifying unit 125 specifies an object presence span (S512: Yes), it manages the specified object presence span as the object approaching span 112 (S513).

[0050] Next, the work schedule determination unit 130 acquires the work schedule for the object approach span for the above-mentioned period from the work schedule management device 300 and determines whether or not there is work scheduled for the object approach span for the above-mentioned period (whether or not advance information has been acquired) (S514). If there is no work scheduled for the above-mentioned period (S514: No), the process proceeds to S515. If there is work scheduled for the above-mentioned period (S514: Yes), the process proceeds to S519.

[0051] In S515, the confirmation instruction generating unit 132 generates information indicating that the site needs to be confirmed, and manages the information as the confirmation instruction 114.

[0052] Next, the contact determination unit 135 determines whether the object has come into contact with the power transmission equipment based on the manner of change over time in the vibration intensity for each frequency at the measurement point along the object approach span during the above-mentioned period, and manages the determination result as the contact determination result 115 (S516). If the contact determination unit 135 determines that the object has come into contact with the power transmission equipment (S516: Yes), the process proceeds to S517. If the contact determination unit 135 determines that the object has not come into contact with the power transmission equipment (S516: No), the process returns to S519.

[0053] In S517, the equipment abnormality determination unit 140 determines whether or not an abnormality has occurred in the power transmission equipment in the object approach span. If the equipment abnormality determination unit 140 determines that an abnormality has occurred in the power transmission equipment in the object approach span (S517: Yes), the determination result is managed as the equipment abnormality determination result 116, and the process proceeds to S518. On the other hand, if the equipment abnormality determination unit 140 determines that no abnormality has occurred in the power transmission equipment in the object approach span (S517: No), the process proceeds to S519.

[0054] In S518, the correspondence information generation unit 145 generates correspondence information for the object approach span in which it has been determined that an abnormality has occurred, and manages the generated correspondence information as the correspondence information 117.

[0055] In S519, the object approaching information presentation unit 150 generates a screen presenting information regarding the approaching object (hereinafter referred to as the "object approaching information presentation screen 600") and presents the generated object approaching information presentation screen 600 to the administrator.

[0056] FIG. 6 shows an example of an object approach information presentation screen 600 .

[0057] As shown in the figure, the exemplary object approach information presentation screen 600 has a display field 611 for the observation date and time, a display field 612 for the object approach distance, a display field 613 for the work schedule and confirmation instructions, a display field 614 for whether or not there has been contact, and a display field 615 for the corresponding information.

[0058] The observation date and time display field 611 displays the date and time when the object approaching span specifying unit 125 specified the object approaching span.

[0059] The object approach span display field 612 displays the span ID of the object approach span identified by the object approach span identifying unit 125 (contents of the object approach span 112).

[0060] The work schedule and confirmation instruction display field 613 displays the contents of the work schedule 311 for the above-mentioned period of the object approach span acquired by the work schedule existence determination unit 130 and the contents of the confirmation instruction 114 generated by the confirmation instruction generation unit 132.

[0061] The contact presence / absence display field 614 displays the result of the determination made by the contact presence / absence determining unit 135 (contents of the contact presence / absence determination result 115).

[0062] In the corresponding information display field 615, the contents of the corresponding information 117 are displayed.

[0063] By referring to the object approach information presentation screen 600, the administrator can quickly check information about the object approaching span (span ID, whether work is scheduled, whether the object has come into contact with the power transmission equipment, etc.), whether any action is required, and what action should be taken, allowing the administrator to take the necessary action efficiently and quickly.

[0064] As described above, according to the facility monitoring system 1 of the present embodiment, information about an object approaching the power transmission facility can be rapidly obtained remotely based on information obtained using the DAS, and the information can be provided to the manager of the power transmission facility. Therefore, based on the provided information, the manager can quickly grasp that an object has approached the power transmission facility and the impact that the object has had on the power transmission facility, and can efficiently monitor the approach of or contact between an object and the power transmission facility, thereby preventing accidents such as power outages.

[0065] The above-described embodiments are provided to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention may be modified or improved without departing from the spirit thereof, and equivalents thereof are also included in the present invention.

[0066] For example, the object approach information presentation unit 150 may receive a span (span ID) specification from the user and present at least one of the object approach span 112, work schedule 113, confirmation instruction 114, contact determination result 115, equipment abnormality determination result 116, and corresponding information 117 corresponding to the received span.

[0067] Furthermore, for example, the extraction of the object approach span by the object approach span identification unit 125 and the determination of whether or not the object is in contact with the power transmission equipment by the contact determination unit 135 may be performed using a machine learning model that has been trained to output the determination results of the object approach span and whether or not the object is in contact with the power transmission equipment as objective variables when feature quantities extracted by performing image recognition processing on the graph (image) shown in Figure 3B are input as explanatory variables.

[0068] Furthermore, for example, information on the surrounding environment of the location where the object is located may be acquired, and the type of object may be identified by taking the information on the surrounding environment into consideration. For example, if the surrounding environment of the location where the object is located is a residential area, it can be estimated that the object is likely to be heavy machinery.

[0069] Furthermore, since the time variation of the vibration intensity for each frequency at a measurement point shows a specific pattern for each type of object, the type of object present near each measurement point may be identified based on the time variation of the vibration intensity for each frequency at each observed measurement point, and the identified type of object may be displayed.

[0070] Furthermore, by comparing the time changes in vibration intensity for each frequency at each measurement point on each span with the time periods during which the above-mentioned strong vibration intensity is observed, dynamic information between each measurement point and the object (such as the relative speed between the two) can be obtained, and the obtained information can be presented.

[0071] REFERENCE SIGNS LIST 1 Equipment monitoring system 2 Transmission tower 3 Power transmission line 4 OPGW 4a Optical fiber 100 Equipment monitoring device 107 Optical analysis unit 110 Storage unit 111 Vibration state at each measurement point 112 Object approach span 113 Work schedule 114 Confirmation instruction 115 Contact presence / absence determination result 116 Equipment abnormality presence / absence determination result 117 Response information 118 Power transmission equipment information 120 Vibration state measurement unit 125 Object approach span identification unit 130 Work plan presence / absence determination unit 132 Confirmation instruction generation unit 135 Contact presence / absence determination unit 140 Equipment abnormality presence / absence determination unit 145 Response information generation unit 150 Object approach information presentation unit S500 Equipment monitoring process 600 Object approach information presentation screen

Claims

1. An equipment monitoring system comprising an optical analysis unit and an information processing device, which acquires, using Distributed Acoustic Sensing (DAS), the time change in vibration intensity for each frequency of an optical fiber at measurement points set along the optical fiber installed along a power transmission line, extracts a span having the measurement point where the time change in vibration intensity for each frequency includes an aspect caused by sound waves emitted from an object present in the vicinity of the measurement point, as an object approach span, and generates information indicating the extracted object approach span.

2. An equipment monitoring system as described in claim 1, which determines whether or not the object has come into contact with power transmission equipment based on whether or not the change over time in vibration intensity for each frequency at the measurement point in the object approach span includes an aspect attributable to contact with the power transmission equipment.

3. An equipment monitoring system as described in claim 2, which determines whether or not an abnormality has occurred in the power transmission equipment by comparing a natural frequency determined from the vibration intensity for each frequency at the measurement point on the object approach span with a natural frequency determined from the vibration intensity for each frequency at the measurement point on the object approach span under normal conditions that has been stored in advance, and generates information indicating the result of the determination.

4. An equipment monitoring system according to claim 1, wherein the result of the determination as to whether or not the object has come into contact with the power transmission equipment is output via a user interface.

5. An equipment monitoring system as claimed in claim 3, wherein, when it is determined that an abnormality has occurred in the power transmission equipment in the object approach span, information indicating that fact is output via a user interface.

6. An equipment monitoring system as described in claim 3, which stores information indicating the action to be taken when an abnormality occurs in the power transmission equipment for each span, and outputs, via a user interface, information indicating the action to be taken for the power transmission equipment determined to have an abnormality.

7. An equipment monitoring method in which, in an equipment monitoring system comprising an optical analysis unit and an information processing device, the information processing device executes the following steps: acquiring the time change in vibration intensity for each frequency of an optical fiber at measurement points set along an optical fiber attached along a power transmission line using Distributed Acoustic Sensing (DAS); extracting, as an object approach span, a span having the measurement point where the time change in vibration intensity for each frequency includes an aspect attributable to sound waves emitted from an object present in the vicinity of the measurement point; and generating information indicating the extracted object approach span.

8. An equipment monitoring method as described in claim 7, further comprising the step of: determining whether or not the object has come into contact with a power transmission facility based on whether or not the change over time in vibration intensity for each frequency at the measurement point in the object approach span includes an aspect attributable to contact with the power transmission facility.

9. An equipment monitoring method as described in claim 8, further comprising the step of: determining whether or not an abnormality has occurred in the power transmission equipment by comparing the natural frequency determined from the vibration intensity for each frequency at the measurement point in the object approach span with the natural frequency determined from the vibration intensity for each frequency at the measurement point in the object approach span under normal conditions that has been stored in advance, and generating information indicating the result of the determination.

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