Display method, display program, and diagnostic device

Abstract

The display method includes the steps of: acquiring, as a first temperature, a measured value of a temperature at at least one temperature measurement position of the cable 40 at a first time; displaying a first temperature of at least one temperature measurement position; and if there is a position satisfying a first condition based on the first temperature in the at least one temperature measurement position, displaying information of a first mode as information for determining whether the state of the cable at the position satisfying the first condition is abnormal in a mode corresponding to the position satisfying the first condition in the display of the first temperature.

Description

[0001] Cross - reference to related applications

[0002] This application claims the priority of Japanese Patent Application No. 2022 - 203633 (filed on December 20, 2022), and the entire disclosure of that application is incorporated herein by reference for that purpose. Technical field

[0003] The present invention relates to a display method, a display program, and a diagnostic device. Background art

[0004] Currently, the following method is known: calculating the thermal resistance of the ground surrounding a submarine cable based on the temperature and current of the submarine cable over time, and estimating the covering height of the submarine cable based on the thermal resistance of the ground to monitor the submarine cable (for example, refer to Patent Document 1).

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2016 - 201989 Summary of the invention

[0006] Regarding a system for diagnosing the state of a cable based on the temperature of the cable, it is required to improve the accuracy of the diagnostic result.

[0007] The present invention has been made in view of the above problems, and an object thereof is to provide a display method, a display program, and a diagnostic device that improve the accuracy of the diagnostic result of the state of a cable.

[0008] (1) The display method according to several embodiments includes the following steps: obtaining a measured value of the temperature at the temperature measurement position of the cable at a first time as a first temperature; displaying the first temperature; and when a first condition is satisfied based on the first temperature, displaying information in a first manner in a manner corresponding to the portion of the display of the first temperature that satisfies the first condition. By displaying the information in the first manner in association with the display of the measured value of the temperature, it is easy for an operator, a monitoring personnel, or the like to grasp the information indicating the state of the cable. As a result of the operator, the monitoring personnel, or the like easily grasping the information indicating the state of the cable, the accuracy of the diagnostic result of the state of the cable can be improved.

[0009] (2) The display method according to one embodiment, based on the above (1), may be formed to further include the following steps: obtaining a measured value of the temperature at the temperature measurement position of the cable at a second time before the first time as the second temperature; and when the first condition is satisfied based on the change from the second temperature to the first temperature, displaying the information of the first mode in a manner corresponding to the part where the first condition is satisfied in the display of the first temperature. By displaying the information of the first mode in association with the display of the measured value of the temperature, personnel such as operators or monitoring personnel can grasp the information indicating a high possibility of abnormal cable status manifested in the change of temperature over time even if they do not see the information indicating the change of temperature over time. Only the measured value of the temperature needs to be displayed, so the amount of information displayed is reduced. By reducing the amount of information displayed, the space of the display screen for equivalent display is effectively utilized flexibly.

[0010] (3) The display method according to one embodiment, based on the above (2), may be formed to further include the following step, that is, displaying information indicating the change from the second temperature to the first temperature. By displaying the change of the temperature at the temperature measurement position of the cable over time itself, personnel such as operators or monitoring personnel can obtain judgment materials for diagnosing whether the cable status is abnormal. As a result of personnel such as operators or monitoring personnel obtaining the judgment materials, the accuracy of the diagnosis result of the cable status can be improved.

[0011] (4) Based on the display method of the above (3) according to one embodiment, it may be formed that the information indicating the change from the second temperature to the first temperature includes the information of the first mode. By displaying the change of the temperature at the temperature measurement position of the cable over time itself as the information of the first mode, personnel such as operators or monitoring personnel can obtain judgment materials for diagnosing whether the cable status is abnormal. As a result of personnel such as operators or monitoring personnel obtaining the judgment materials, the accuracy of the diagnosis result of the cable status can be improved.

[0012] (5) The display method according to one embodiment, based on any one of the above (1) to (4), may be configured to further include the following steps, that is, when the second condition is satisfied based on the first temperature, display the information of the second mode in a manner corresponding to the part of the display of the first temperature that satisfies the second condition. By displaying the information of the second mode different from the first mode in association with the display of the measured value of the temperature, personnel such as operators or monitoring personnel can easily grasp that the possibility of the cable state abnormality at the position where the information of the second mode is displayed is lower than that at the position where the information of the first mode is displayed. By making the display mode different according to the high or low possibility of the cable state abnormality, personnel such as operators or monitoring personnel can obtain a judgment material for diagnosing whether the cable state is abnormal. As a result of personnel such as operators or monitoring personnel obtaining the judgment material, the accuracy of the diagnosis result of the cable state can be improved.

[0013] (6) The display method according to one embodiment, based on the above (2) or (3), may be configured to further include the following steps: calculate the risk based on the first temperature and the second temperature; and display the risk in a manner corresponding to the display of the first temperature. By displaying the risk, personnel such as operators or monitoring personnel can obtain a judgment material for diagnosing whether the cable state is abnormal. As a result of personnel such as operators or monitoring personnel obtaining the judgment material, the accuracy of the diagnosis result of the cable state can be improved.

[0014] (7) The display method according to one embodiment, based on the above (6), may be configured to further include the following steps, that is, when the risk satisfies the third condition, display the information of the first mode in a manner corresponding to at least one of the part of the display of the first temperature that satisfies the third condition or the part of the display of the risk that satisfies the third condition. By displaying the information of the first mode in association with the display of the measured value of the temperature based on the high or low risk, personnel such as operators or monitoring personnel can grasp the information indicating a relatively high possibility of the cable state abnormality shown in the change of the temperature over time even if they do not see the information indicating the change of the temperature over time. Only the measured value of the temperature needs to be displayed, so the amount of displayed information is reduced. By reducing the amount of displayed information, the space of the display screen for equivalent display is effectively utilized.

[0015] (8) The display program according to several embodiments causes a computer to execute the display method according to any one of the above (1) to (7).

[0016] (9) The diagnostic device according to several embodiments includes a control unit that executes the display method according to any one of the above (1) to (7).

[0017] Effect of the Invention

[0018] According to the display method, display program, and diagnostic device of the present invention, the accuracy of the diagnostic result of the state of the cable can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a diagram showing a display screen of the measured value of the temperature related to the comparative example.

[0020] Figure 2 It is a schematic diagram showing a structural example of the diagnostic system according to one embodiment.

[0021] Figure 3 It is a block diagram showing a structural example of the diagnostic system according to one embodiment.

[0022] Figure 4 It is a schematic diagram showing a structural example of the cable.

[0023] Figure 5A It is a cross-sectional view showing an example of a cable buried underground.

[0024] Figure 5B It is a cross-sectional view showing an example of a cable substantially exposed on the seabed.

[0025] Figure 6 It is a diagram showing an example of a display screen of the measurement result including the temperature trend.

[0026] Figure 7 It is a diagram showing an example of a display screen of the measurement result including the risk trend.

[0027] Figure 8 It is a diagram showing an example of a display screen in which the display mode of the part of the measured value of the temperature that satisfies the condition is changed.

[0028] Figure 9 It is a flowchart showing an example of the process of the diagnostic method according to one embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0029] A diagnostic system 1 according to an embodiment of the present invention (refer to Figure 2 ) is used to diagnose the state of a submarine cable connected to an offshore wind power generation device or the like as an object of diagnosis. Hereinafter, an embodiment of the diagnostic system 1 will be described in comparison with a comparative example.

[0030] (Comparative Example)

[0031] As a comparative example, a method of diagnosing the state of a submarine cable based on the measured value of the temperature of the submarine cable as an object is considered. As Figure 1As shown, at each position in the length direction of the submarine cable, measured values of the temperature of the submarine cable are obtained. Figure 1 The horizontal axis of Figure 1 represents the position in the length direction of the submarine cable. The vertical axis represents the measured values of the temperature of the submarine cable at each position.

[0032] Figure 1 The curve graph of indicates that the measured values of the temperature deviate from the normal state at point A, point B, or point C. The points deviating from the normal state may include the points where the measured values of the temperature deviate from the specified range, or may include the points where the measured values of the temperature are maximum or minimum values. Personnel such as operators or monitoring personnel who monitor the state of the submarine cable can observe the curve graph of the measured values of the temperature at each position of the submarine cable, and diagnose that the state of the submarine cable may be abnormal at the position where the measured values of the temperature deviate from the normal state, but it is difficult to diagnose with high accuracy whether an abnormality actually occurs. In addition, even if the state of the submarine cable is actually abnormal at this position, it is difficult for personnel such as operators or monitoring personnel to diagnose the type of abnormality of the submarine cable with high accuracy.

[0033] Therefore, the present invention will describe a display method, a display program, and a diagnostic device 10 (refer to Figure 2 ) for improving the accuracy of the diagnostic result of the state of the cable 40 (refer to Figure 2 ) as the object in the diagnostic system 1. Figure 2 for improving the accuracy of the diagnostic result of the state of the cable 40 (refer to Figure 2 ) as the object in the diagnostic system 1. Figure 2 ).

[0034] (Embodiment of the present invention)

[0035] As Figure 2 shown, a diagnostic system 1 according to an embodiment includes a diagnostic device 10, a temperature measuring device 20, and a display device 30. The diagnostic system 1 provides information required for personnel such as operators or monitoring personnel to diagnose the state of the cable 40. In addition, the diagnostic system 1 not only provides information required for personnel such as operators or monitoring personnel to diagnose the state of the cable 40, but can also diagnose the state of the cable 40 by the diagnostic system 1 itself based on the acquired information.

[0036] In the present embodiment, the cable 40 is a submarine cable buried underground 80 in a manner passing through the seabed 81 for the purpose of transmitting the power generated by the ocean wind power generation device 70 to the land 82, or for communication between the ocean wind power generation device 70 and devices such as the diagnostic device 10 on the land 82, or for other various purposes. The target for which the cable 40 transmits power or the target to which the cable 40 is connected by communication is not limited to the devices on the land 82, and may also be devices on the sea or in the middle of the sea.

[0037] The cable 40 includes a portion buried in the ground 80, a portion exposed from the ground 80 to the sea 84, or a portion close to being exposed, due to the unevenness of the seabed 81. The reasons for the cable 40 to be exposed or close to being exposed from the ground 80 to the sea 84 include excavation of the seabed 81 or the cable 40 floating up. The portion buried in the ground 80 is exemplified as the buried portions 51 and 53. The portion exposed from the ground 80 to the sea 84 is exemplified as the exposed portion 52. The cable 40 includes a portion that is not exposed in the sea 84 but has a shallower burial depth relative to the ground 80. The portion with a shallower burial depth relative to the ground 80 is exemplified as the shallow burial portion 54. The state where the cable 40 is completely exposed from the seabed 81, the state where a part of the cable 40 is exposed, or the state where the thickness of the sand that should originally be above the cable 40 is reduced but does not reach the degree of cable 40 exposure can be regarded as abnormal burial and detected by temperature measurement. The state where the thickness of the sand that should originally be above the cable 40 is reduced but does not reach the degree of cable 40 exposure, for example, although the thickness of the sand above the cable 40 should originally be 2m, includes the state where the thickness of the sand is halved to 1m or reduced to several tens of cm, etc., which is a state where the cable 40 is close to being exposed.

[0038] The exposed portion 52 or the shallow burial portion 54 sometimes occurs due to phenomena such as excavation where the seabed 81 is eroded by ocean currents or the dragging of the anchor of a ship or fishing gear, etc., which makes the shape of the seabed 81 become a concave portion. The exposed portion 52 or the shallow burial portion 54 sometimes also occurs due to the floating up of the cable 40 caused by the movement of the seabed 81 due to an earthquake or the like.

[0039] The cable 40 includes a portion pulled out from the ground 80 to the sea 84 for connection to the offshore wind power generation device 70. The portion pulled out from the ground 80 to the sea 84 is exemplified as the boundary portion 55.

[0040] Submarine cables are prone to buckling or breakage due to the collision of fishing gear or anchors, etc., with the exposed portion 52 or the shallow burial portion 54. Operators, monitoring personnel, and other personnel can diagnose whether the submarine cable is in a state of being exposed or close to being exposed in the sea 84 based on the information provided by the diagnostic system 1. In addition, the diagnostic device 10 can diagnose whether the submarine cable is in a state of being exposed or close to being exposed in the sea 84 based on the information obtained by the diagnostic device 10 itself.

[0041] The temperature of the submarine cable is different when it is buried 80 underground, exposed 84 in the sea, or substantially exposed 84 in the sea. Therefore, for the diagnostic system 1 according to the present embodiment, the temperature measuring device 20 measures the temperature of at least a part of the cable 40. The display device 30 displays information such as the measured values of the temperatures of the respective parts of the cable 40. Based on the information displayed on the display device 30, a person such as an operator or a monitoring officer diagnoses whether the cable 40 is buried 80 underground, exposed 84 in the sea, or has a high possibility of being exposed, as the state of the cable 40. A person such as an operator or a monitoring officer can not only diagnose the burial state of the cable 40, but also diagnose the heating state of the cable 40.

[0042] (Structural example of diagnostic system 1)

[0043] Next, Figure 3 a structural example of the diagnostic system 1 shown by way of example will be described.

[0044] <Diagnostic device 10>

[0045] As described later, the diagnostic device 10 displays on the display device 30 the temperatures of the respective parts of the cable 40 measured by the temperature measuring device 20. In addition, when the conditions based on the temperatures of the respective parts of the cable 40 are satisfied, the diagnostic device 10 displays on the display device 30, for the parts that satisfy the conditions, information in a manner that can be discriminated by a person such as an operator or a monitoring officer, together with the temperatures of the respective parts of the cable 40. Hereinafter, a person such as an operator or a monitoring officer will also be simply referred to as a person. The diagnostic device 10 can diagnose whether the states of the respective parts of the cable 40 are abnormal based on the displayed content. The diagnostic device 10 includes a control unit 12, a storage unit 14, and an interface 16.

[0046] The control unit 12 controls the respective structural parts of the diagnostic device 10. The control unit 12 can be configured to include a processor such as a CPU (Central Processing Unit), for example. The control unit 12 can cause the processor to execute a prescribed program to implement a prescribed function.

[0047] The storage unit 14 can store various information for the operation of the control unit 12 or a program for implementing the function of the control unit 12, etc. The storage unit 14 can function as a working memory of the control unit 12. The storage unit 14 can be constituted by a semiconductor memory or the like, for example. The storage unit 14 can be configured to include a volatile memory or a non-volatile memory. The storage unit 14 can be configured as a non-temporary computer-readable storage medium. The storage unit 14 can be included in the control unit 12.

[0048] The storage unit 14 can store information during the burial of the cable 40. The information during the burial of the cable 40 can include the burial position or burial depth of the cable 40 when the cable 40 is normally buried. The information during the burial of the cable 40 can include the measured values of the temperatures of the respective parts of the cable 40 when no current flows through the cable 40 immediately after the cable 40 is normally buried or immediately after the cable 40 is normally maintained. The information during the burial of the cable 40 can include information related to the geology of the place where the cable 40 is buried. The information related to the geology can include the geological category or the underground heat conductivity. The storage unit 14 can store information after the cable 40 is buried. The information after the cable 40 is buried can include the measured values of the temperatures of the respective parts of the cable 40 when current flows through the cable 40. The information after the cable 40 is buried can include data associating the magnitude of the current flowing through the cable 40, the magnitude of the voltage applied to the cable 40, and the temperatures of the respective parts of the cable 40. The storage unit 14 can include the characteristics of the temperature measurement of the cable 40.

[0049] The interface 16 is configured to include a communication device that connects the diagnostic device 10 and the temperature measurement device 20 or the display device 30 or the like in a communicable manner. The communication device can be configured to communicate, for example, based on mobile communication standards such as 4G (4th Generation) or LTE (Long Term Evolution) or 5G (5th Generation). The communication device can be configured to communicate, for example, based on the communication standard of LAN (Local Area Network). The communication device can be configured to communicate in a wired or wireless manner.

[0050] The interface 16 can be configured to include a display device. The display device can include various displays such as a liquid crystal display, for example. The interface 16 can be configured to include a voice output device such as a speaker. The interface 16 is not limited thereto and can also be configured to include other various output devices.

[0051] The interface 16 can be configured to include an input device that accepts input from a user. The input device can include a keyboard or physical keys, for example, and can also include a pointing device such as a touch panel or a touch sensor or a mouse. The interface 16 can be configured to include other computers or the diagnostic device 10. The input device is not limited to the above examples and can also be configured to include other various devices. The input device can be configured to be able to input parameters or the like for diagnosing the state of the cable 40 using the diagnostic device 10.

[0052] The diagnostic device 10 can be configured as a PC (Personal Computer) or can be configured as at least one server device. The diagnostic device 10 can be implemented by a cloud computing system.

[0053] <Temperature measurement device 20>

[0054] The temperature measuring device 20 measures the temperature of at least a part of the cable 40. The part of the cable 40 that is set as the object to be measured for temperature by the temperature measuring device 20 is also referred to as the measurement object part. In order to use the diagnostic system 1 to diagnose the buried condition or disconnection condition of the entire long cable 40, etc., it is necessary to measure the temperatures of a plurality of parts of the cable 40 that are greater than or equal to several hundred points or several thousand points. The measurement object parts can be set at regular intervals such as at 1 m intervals along the length direction of the cable 40, or can be set at irregular intervals. In the present embodiment, as Figure 4 shown by way of example, the cable 40 has an electric wire 41, an optical fiber 42, and a coating 43. The electric wire 41 and the optical fiber 42 are protected inside the coating 43. In the present embodiment, the temperature measuring device 20 measures the temperature of each part in the length direction of the cable 40 by using the optical fiber 42. The optical fiber 42 used for temperature measurement is also referred to as a DTS (Distributed Temperature Sensor).

[0055] Specifically, the temperature measuring device 20 sends pulsed light to the optical fiber 42. The pulsed light incident on the optical fiber 42 is scattered at various positions in the optical fiber 42 due to Raman scattering. The light scattered due to Raman scattering is also referred to as Raman scattered light. At least a part of the Raman scattered light returns to the incident side of the optical fiber 42. The temperature measuring device 20 acquires a signal based on the Raman scattered light that returns to the incident side of the optical fiber.

[0056] The Raman scattered light includes: Stokes light that is shifted toward the longer wavelength side with respect to the wavelength of the incident pulsed light; and anti-Stokes light that is shifted toward the shorter wavelength side with respect to the wavelength of the incident pulsed light. The intensity of each component of the Raman scattered light depends on the temperature of the optical fiber 42 at the position where the Raman scattering occurs. The temperature measuring device 20 can calculate the temperature of the optical fiber 42 at the position where the light signal is scattered by analyzing the Raman scattered light that returns due to reflection. In addition, the temperature measuring device 20 can calculate the position where the received light signal is reflected based on the time from when the optical signal is sent until the optical signal returns due to reflection. Therefore, the temperature measuring device 20 can calculate the temperature of the optical fiber 42 at each position of the optical fiber 42.

[0057] The temperature of each part of the optical fiber 42 is regarded as being substantially the same as the temperature of each part of the cable 40 corresponding to each part of the optical fiber 42. The temperature measuring device 20 can measure the temperature of each part of the cable 40 by measuring the temperature of each part of the optical fiber 42. In the present embodiment, the temperature of each part of the cable 40 is measured at 1 m intervals. The interval for measuring the temperature is not limited to 1 m, and can also be set to various lengths.

[0058] The temperature measurement device 20 can be configured to measure the temperature of each part of the cable 40 by using temperature sensors respectively provided at the parts of the cable 40 to be measured for temperature. The temperature sensors can be installed on the outer side of the coating 43 of the cable 40 or buried inside the coating 43. The temperature sensors can be installed at the connection part of the cable 40.

[0059] The temperature measurement device 20 is not limited to the measurement method using the optical fiber 42 or the measurement method using temperature sensors, and can also be configured to measure the temperature of each part of the cable 40 by various other methods.

[0060] <Display device 30>

[0061] The display device 30 displays the information required for personnel to diagnose the state of the cable 40. The display device 30 can display various data including the measurement results of the temperature of at least a part of the cable 40 or the change of the temperature measurement results over time. The display device 30 can include various displays such as a liquid crystal display, for example. The display device 30 can be included in the diagnostic device 10 as the display device of the interface 16 of the diagnostic device 10.

[0062] (Operation example of diagnostic system 1)

[0063] As described above, regarding the diagnostic system 1 according to the present embodiment, the diagnostic device 10 displays the measured values of the temperatures of the respective parts of the cable 40 that are the objects of diagnosis on the display device 30. The measured values of the temperatures of the respective parts of the cable 40 include, for example, the measured values of the temperatures of a plurality of temperature measurement positions set in the extending direction of the cable 40. The plurality of temperature measurement positions of the cable 40 can be set at a prescribed interval such as 1 m interval, or can be set at an unfixed interval.

[0064] Here, it is not possible to definitely diagnose that the state change of each temperature measurement position of the cable 40 is an abnormal state only based on the rise or fall of the temperature at each temperature measurement position of the cable 40. Therefore, regarding the diagnostic system 1 according to the present embodiment, when the conditions based on the temperatures of the respective temperature measurement positions of the cable 40 are satisfied, the diagnostic device 10 displays the information of the temperature measurement positions that satisfy the conditions or additional information together with the temperature of the temperature measurement position of the cable 40 in a manner that can be visually confirmed by personnel on the display device 30. Personnel can diagnose the state of each temperature measurement position of the cable 40 based on the information displayed on the display device 30. That is, the diagnostic device 10 can provide information for personnel to diagnose the state of each temperature measurement position of the cable 40. The diagnostic device 10 can diagnose the state of each temperature measurement position of the cable 40 by using the diagnostic device 10 itself.

[0065] For example Figure 5A and Figure 5BAs shown, the heat transferred from the cable 40 to the sea 84 varies depending on the burial depth of the cable 40 in the ground 80. As Figure 5A For example, when the cable 40 is buried deep in the ground 80, the heat taken from the cable 40 by the ocean current 85 in the sea 84 decreases. On the other hand, as Figure 5B For example, when the cable 40 is about to be exposed from the ground 80 to the sea 84 or when the cable 40 is exposed in the sea 84, the heat taken from the cable 40 by a part of the ocean current 86 close to the cable 40 in the ocean current 85 in the sea 84 increases. Due to the abnormal burial of the cable 40, the sand on the cable 40 decreases, causing the cable 40 to approach or contact the seawater. The cable 40 takes heat from the seawater because it approaches or contacts the seawater. The cable 40 takes heat from the seawater, making the temperature of the part of the cable 40 close to or in contact with the seawater relatively lower than the temperature of the normally buried part of the cable 40. Therefore, the part of the cable 40 where the temperature of the diagnostic object part decreases takes heat from the seawater, and it is judged as a state of abnormal burial where the amount of sand on the cable 40 decreases. In Figure 5A and Figure 5B In the comparison, the closer the burial position of the cable 40 is to the sea 84, the lower the temperature of the cable 40 at that burial position. Therefore, a person or the diagnostic device 10 can diagnose the burial position of each part of the cable 40 based on the measured values of the temperature of each part of the cable 40.

[0066] In addition, when the cable 40 buckles or breaks, the resistance value of the electric wire 41 in the cable 40 may increase. The heat generation amount at the buckling part or the breakage part increases due to the increase in the resistance value of the electric wire 41. The temperature of the part where the heat generation amount increases in the cable 40 rises. A person or the diagnostic device 10 can diagnose abnormalities such as buckling or breakage generated in each part of the cable 40 based on the temperature of each part of the cable 40.

[0067] Not limited to abnormalities such as the abnormal burial position of the cable 40 or the buckling or breakage of the cable 40, a person or the diagnostic device 10 can also diagnose various other states of the cable 40. Next, an operation example of the diagnostic system 1 providing information for a person to diagnose the state of the cable 40 will be described.

[0068] <Display of Measured Temperature Values>

[0069] The control unit 12 of the diagnostic device 10 obtains the measured values of the temperatures at the respective temperature measurement positions of the cable 40 at the first time from the temperature measurement device 20. The measured values of the temperatures at the respective temperature measurement positions of the cable 40 at the first time are also referred to as the first temperatures. In other words, the control unit 12 can obtain the first temperatures, which are the temperatures at at least one temperature measurement position of the cable 40 at the first time. The first time can be any time during the period of operation for generating information for the control unit 12 to monitor the state of the cable 40.

[0070] The control unit 12 displays the first temperatures on the display device 30. The control unit 12 can obtain the first temperatures at multiple positions of the cable 40 and display the distribution of the first temperatures on the display device 30. The control unit 12 can, for example, display the distribution of the first temperatures as a curve graph shown as the actual temperature in Figure 6 The vertical axis of the curve graph of the actual temperature represents the first temperature. The horizontal axis represents the distance from the temperature measurement device 20 to the temperature measurement location of the cable 40. The distance from the temperature measurement location of the cable 40 corresponds to the position in the length direction of the cable 40. In other words, the control unit 12 can display the first temperatures, which are the temperatures at at least one temperature measurement position of the cable 40 at the first time.

[0071] The control unit 12 can display on the display device 30 the change over time of the measured values of the temperatures of the respective parts of the cable 40. The control unit 12 can obtain the measured values of the temperatures of the respective parts of the cable 40 at the second time before the first time. Here, the control unit 12 obtains the measured values of the temperatures of the respective parts of the cable 40 at regular time intervals. The regular time intervals can be set in various lengths such as in units of 1 minute, 1 hour, 1 day, 1 week, 1 month, or 1 year, etc. The first time corresponds to the time of obtaining the measured values of the temperatures of the respective parts of the current cable 40 for monitoring the state of the current cable 40. The second time corresponds to the time of obtaining the measured values of the temperatures of the respective parts of the previous cable 40 for monitoring the state of the current cable 40. Therefore, the second time can correspond to a time advanced by a time corresponding to the regular time interval compared to the first time. When the regular time interval is constant, the second time can correspond to a time advanced by a natural multiple of the regular time interval compared to the first time. The measured values of the temperatures of the respective parts of the cable 40 at the second time are also referred to as the second temperatures. The control unit 12 can obtain the measured values of the temperatures of the respective parts of the cable 40 at multiple second times before the first time. That is, the control unit 12 can obtain the temperatures at multiple second times as multiple second temperatures.

[0072] The control unit 12 can display on the display device 30 the change over time of the measured values of the temperatures of the respective parts of the cable 40 by arranging the display corresponding to the second temperature and the display corresponding to the first temperature. The control unit 12 can, for example, asFigure 6 The change over time in the measured values of the temperature of each part of the cable 40 is displayed as an image drawn in gray scale. An image showing the change over time in the measured values of the temperature is also called a temperature trend. The image showing the change over time in the measured values of the temperature includes pixels representing the measured value of the temperature at a certain position of the cable 40 at a certain time in gray scale. The pixels in each row included in the image represent the measured values of the temperature of each part of the cable 40 at each time. The pixels in each row are pixels arranged in the left-right direction. Each row corresponds to a time from the past approaching the present from the bottom up. The range of time corresponding to the pixels in each row of the image, that is, the range of time displayed as the image, can be set to various ranges such as the most recent 1 hour, the most recent 24 hours (i.e., 1 day), or the most recent 1 week, etc. It is possible to grasp how the temperature at each position of the cable 40 changes within the range of time displayed as the image, or for how long a period it continuously changes, etc. In other words, Figure 6 The rectangular pattern included in the image is equivalent to a pattern displayed in a bar chart-like manner, with the time during which the measured value of the temperature at the position of the cable 40 corresponding to the pattern remains different from the surrounding measured values represented as the vertical length. The pixels in each column included in the image represent the distance from the temperature measuring device 20 to the temperature measuring location of the cable 40 corresponding to the temperature measurement position of the cable 40. The pixels in each column are pixels arranged in the up-down direction. Each column is arranged according to the distance from the temperature measuring device 20 to the temperature measuring location of the cable 40 and corresponds to the position in the length direction of the cable 40. In Figure 6 the display, the temperature trend showing the change over time in the temperature of each part of the cable 40 is associated with a curve graph representing the measured values of the temperature of each part of the cable 40.

[0073] In Figure 6In the image, the rectangular pattern 61 of a color close to white displayed at the position corresponding to point B indicates that the duration of the state where the temperature is higher than the surroundings is short, that is, the duration of the current temperature is short. In addition, the triangular pattern 62 of a color close to black located at the position corresponding to point C indicates that the duration of the state where the temperature is lower than the surroundings is short but longer than that corresponding to the position of point B. In addition, the rectangular pattern 63 of a color close to black located at the position corresponding to point A indicates that the duration of the state where the temperature is lower than the surroundings is long at least in the time period within the range shown in the image, that is, the duration of the current temperature is long. A person can diagnose that a sudden abnormality has occurred regarding point B corresponding to pattern 61. A person can diagnose that a gradually developing abnormality has occurred regarding point C corresponding to pattern 62. A person can diagnose that it is not an abnormal state but a normal state with a cause for the temperature of a specific part of cable 40 to steadily decrease regarding point A corresponding to pattern 63. By displaying the change in temperature over time at the temperature measurement positions of cable 40 itself, a person can obtain judgment materials for diagnosing whether the state of cable 40 is abnormal. As a result of the person obtaining the judgment materials, the accuracy of the diagnostic result of the state of cable 40 can be improved.

[0074] <Display of risk level>

[0075] The control unit 12 can calculate values representing the state of each part of the cable 40, such as an abnormality in the buried state of the cable 40 in each part of the cable 40. It may also cause accidents or dangerous phenomena in the operation of equipment or activities around the equipment, such as a part of the cable 40 exposed from the seabed 81 being caught by an anchor or the like and damaged due to the occurrence of a buried abnormality. Therefore, the value representing the state of each part of the cable 40 is also referred to as the risk level. The control unit 12 can calculate the risk level of each part of the cable 40 based on the first temperature. The closer the state of the diagnostic object part of the cable 40 is to abnormal, the larger value the control unit 12 calculates for the risk level value of the diagnostic object part. The closer the state of the diagnostic object part is to normal, the smaller value the control unit 12 calculates for the risk level value. The risk level value can be calculated as a value standardized within the range of greater than or equal to 0 and less than or equal to 1. The diagnostic object part corresponds to any part of the cable 40.

[0076] The control unit 12 can calculate the risk level in the following manner: when the diagnostic object part of the cable 40 is in a normal state where it is fully buried in a deeper position underground 80, the risk level value representing the state of the diagnostic object part of the cable 40 is calculated as 1, and the shallower the position where the diagnostic object part of the cable 40 is buried, the greater the value of the risk level becomes. The expression of the risk level value is not limited to the above example. If the degree of risk of the state of the cable 40 is grasped, the risk level value can be freely expressed including percentages and the like.

[0077] In the following description, the risk value is expressed as a value that is normalized within the range greater than or equal to 0 and less than or equal to 1, and the closer the state of the diagnostic target portion of the cable 40 is to normal, the closer it is to 0, and the closer the state of the diagnostic target portion of the cable 40 is to abnormal, the closer it is to 1. For example, the control unit 12 can calculate the risk value with a value greater than or equal to 0.5 corresponding to the case where the cable 40 is still buried but the buried position becomes shallower and approaches the exposure to the sea 84. For example, the control unit 12 can calculate the risk such that the risk becomes 0.5 when the buried depth of the diagnostic target portion of the cable 40 becomes about 50 cm. For example, the control unit 12 can calculate the risk value with a value greater than or equal to 0.95 corresponding to the case where the cable 40 is exposed in the sea 84. The values such as 0.5 or 0.95 calculated by the control unit 12 as the risk value corresponding to the abnormal state or the like of the cable 40 are not limited to the above values. The control unit 12 can appropriately set the risk value corresponding to the abnormal state or the like of the cable 40.

[0078] For example, the control unit 12 can calculate the risk with a larger value corresponding to the state where the cable 40 is bent or damaged. For example, the control unit 12 can calculate the risk of a certain position of the cable 40 with a larger value as the resistance value of that position of the cable 40 is higher.

[0079] The control unit 12 can calculate the risk based on both the temperature measured at the temperature measurement position of the cable 40 at the first time, i.e., the first temperature, and the temperature measured at the temperature measurement position of the cable 40 at the second time before the first time, i.e., the second temperature. The control unit 12 can calculate the risk based on the change amount from the second temperature to the first temperature, i.e., the change amount from the temperature at the second time to the temperature at the first time. The control unit 12 can calculate the risk of a certain part of the cable 40 based on the comparison between the first temperature of this part and the first temperature of the surrounding part. For example, the control unit 12 can calculate the risk of the part where the first temperature rises or falls compared with the surrounding with a larger value.

[0080] The control unit 12 can calculate the risk of a certain part of the cable 40 based on the comparison between the change amount of the temperature of this part and the change amount of the temperature of the surrounding part. For example, the control unit 12 can calculate the risk of the part where the change amount of the temperature is larger compared with the surrounding with a larger value.

[0081] The control unit 12 can display the risk calculated based on the measured values of the temperatures of the respective parts of the cable 40 on the display device 30. For example, the control unit 12 can Figure 6In the curve graph showing the risk level, the risk level is displayed in a manner corresponding to the display of the first temperature. The vertical axis of the curve graph of the risk level represents the risk level. The horizontal axis represents the distance from the temperature measurement device 20 to the temperature measurement location of the cable 40, that is, the position in the longitudinal direction of the cable 40. The data represented by the solid line in the curve graph of the risk level represents the risk level calculated based on the actual measurement values of the temperatures of the respective parts of the cable 40. The data 93 represented by the dashed line in the curve graph of the risk level represents the result of predicting the future risk level through calculation, machine learning, or the like. In this way, the curve graph can be presented in a manner that contrasts the risk level based on the actual measurement values of the temperatures of the respective parts of the cable 40 with the prediction result of the risk level.

[0082] The control unit 12 can display the measurement values of the temperatures of the respective parts of the cable 40 and an image showing the change in the temperature of the respective parts of the cable 40 over time side by side in a manner associated with the position in the longitudinal direction of the cable 40. The control unit 12 can display the measurement values of the temperatures of the respective parts of the cable 40 and the risk levels of the respective parts of the cable 40 side by side in a manner associated with the position in the longitudinal direction of the cable 40. The control unit 12 can display the measurement values of the temperatures of the respective parts of the cable 40, an image showing the change in the temperature of the respective parts of the cable 40 over time, and the risk levels of the respective parts of the cable 40 side by side in a manner associated with the position in the longitudinal direction of the cable 40. That is, the control unit 12 can perform side-by-side display in such a way that at least one of the measurement values of the temperatures of the respective parts of the cable 40 and the change in temperature over time or the risk level is associated.

[0083] The control unit 12 can, as Figure 7 shown by way of example, display an image showing the change in the risk level over time instead of an image showing the change in temperature over time. The image showing the change in the risk level over time is also referred to as the risk level trend. Figure 7 The image showing the change in the risk level over time contains pixels representing the magnitude of the risk level at a certain position of the cable 40 at a certain time in grayscale. The pixels in each row included in the image represent the measurement values of the temperatures of the respective parts of the cable 40 at each time. The pixels in each row are arranged in the left-right direction. Each row corresponds to a time approaching the current from the past from bottom to top. The pixels in each column included in the image represent the distance from the temperature measurement device 20 to the temperature measurement location of the cable 40 corresponding to the temperature measurement position of the cable 40. The pixels in each column are arranged in the up-down direction. Each column is arranged according to the distance from the temperature measurement device 20 to the temperature measurement location of the cable 40 and corresponds to the position in the longitudinal direction of the cable 40. In Figure 7 the display, the risk level trend showing the risk levels of the respective parts of the cable 40 is associated with the curve graph showing the measurement values of the temperatures of the respective parts of the cable 40.

[0084] In Figure 7 the image of, the rectangular pattern 71 of a color close to black located at the position corresponding to point B indicates that the risk level suddenly increases from a time close to the current time. In addition, the triangular pattern 72 of a color close to black located at the position corresponding to point C indicates that the range with a relatively high risk level expands as time passes. On the other hand, at the part corresponding to point A, although the temperature changes, no pattern indicating an increase in the risk level is seen. This is because, for a normally buried structure, when the burial degree decreases or the cable 40 is exposed, the temperature is different between the normal time, i.e., the previous normal burial time, and the abnormal time, i.e., the current time point. In addition, this is because, for a part to be determined as having an abnormality or a part with a possibility of having an abnormality, even if the temperature at the current time point shows a relatively high value or a relatively low value, when the same relatively high temperature or relatively low temperature has continued when traced back to the past, for example, by regarding it as a part that was not originally buried, it is determined that no abnormality has occurred, i.e., there is no risk. If applied to Figure 7 the image, for a part to be determined as having an abnormality or a part with a possibility of having an abnormality, even if a relatively low value is shown for the part corresponding to point A, when the relatively low temperature continues for the part corresponding to point A, by regarding point A as, for example, a part that was not originally buried, it can be determined that no abnormality has occurred at point A, i.e., there is no risk. A person can diagnose that a sudden abnormality has occurred for point B corresponding to the pattern 71. A person can diagnose that a gradually developing abnormality has occurred for point C corresponding to the pattern 72. A person can diagnose that point A, where no characteristic pattern is seen, is not in an abnormal state but in a normal state where there is a cause for the temperature decrease in a specific part where the cable 40 stably exists. By displaying the risk level, a person can obtain a judgment material for diagnosing whether the state of the cable 40 is abnormal. As a result of the person obtaining the judgment material, the accuracy of the diagnosis result of the state of the cable 40 can be improved.

[0085] <Additional Display>

[0086] As Figure 8As an example, the control unit 12 can display information shown in different ways by attaching information that cannot be understood by a person even when only looking at the temperature distribution curve graph to the temperature distribution curve graph. For example, as information that cannot be understood by a person even when only looking at the temperature distribution curve graph regarding point B, the control unit 12 can superimpose the first marker 91, which represents the current temperature of point B and has a short duration, as additional information on point B of the curve graph, so that the additional information is displayed in association with the temperature of point B. For example, as information that cannot be understood by a person even when only looking at the temperature distribution curve graph regarding point C, the control unit 12 can superimpose the second marker 92, which represents the current temperature of point C and has a short duration but longer than the current temperature duration of point B, as additional information on point C of the curve graph, so that the additional information is displayed in association with the temperature of point C. That is, the first marker 91 and the second marker 92 can be displayed in a manner corresponding to the length of the current temperature duration of each point of the cable 40. For example, the first marker 91 can be displayed in a darker color than the second marker 92 to indicate that the current temperature duration of the point corresponding to the first marker 91 is shorter than the current temperature duration of the point corresponding to the second marker 92.

[0087] The first marker 91 is also referred to as information of the first mode. The second marker 92 is also referred to as information of the second mode. The information of the first mode and the information of the second mode can indicate that the risk level of the position displayed in association with the information of the first mode is higher than the risk level of the position displayed in association with the information of the second mode.

[0088] The additional information can represent information that can be understood by a person when seeing the risk level trend. By superimposing the additional information such as the information of the first mode or the information of the second mode on the temperature distribution curve graph and displaying the additional information in association with the temperature, even if the temperature trend or the risk level trend is not displayed, a person can grasp the information that can be understood when seeing the temperature trend or the risk level trend only by observing the temperature distribution curve graph. The temperature trend or the risk level trend can also not be displayed, so that the amount of information displayed is reduced. By reducing the amount of information displayed, the space of the display screen during equivalent display can be effectively utilized flexibly. In addition, the display resolution of the curve graph of the measured value of the temperature can be improved.

[0089] The control unit 12 can determine whether the first marker 91, which is the information in the first mode, is displayed based on a specified condition. The specified condition for determining the display of the information in the first mode is also referred to as the first condition. For example, the control unit 12 can make a determination with the condition that the duration for which the temperature at a certain location deviates from the specified range is less than the specified time as the first condition. For example, the control unit 12 can make a determination with the condition that the duration for which the difference between the temperature at a certain location and the temperatures at the surrounding locations deviates from the specified range is less than the specified time as the first condition. When the control unit 12 satisfies the first condition based on the first temperature, it can display the information in the first mode in a manner corresponding to the part of the display of the first temperature that satisfies the first condition. In other words, when there is a position that satisfies the first condition based on the first temperature among at least one temperature measurement position, the control unit 12 can display the information in the first mode at the position that satisfies the first condition in a manner corresponding to the position that satisfies the first condition in the display of the first temperature. The control unit 12 can display the information in the first mode as information for determining whether the state of the cable 40 is abnormal.

[0090] For example, the control unit 12 can make a determination with the condition that the change amount per unit time of the temperature at a certain location deviates from the specified range as the first condition. That is, the control unit 12 can set the first condition in such a way that the display device 30 can display the temperature change degree and other information in a manner that enables a person to recognize it. The temperature change degree can include the duration information of the changed temperature. When the control unit 12 satisfies the first condition based on the change from the previous second temperature to the current first temperature, it can display the information in the first mode in a manner corresponding to the part of the display of the first temperature that satisfies the first condition.

[0091] The control unit 12 can determine whether to display the second marker 92, which is the information in the second mode, based on a specified condition. The specified condition for determining the display of the information in the second mode is also referred to as the second condition. The control unit 12 can make a determination with the condition of expanding the specified range set under the first condition or extending the specified time as the second condition. On the contrary, the control unit 12 can also make a determination with the condition of narrowing the specified range set under the first condition or shortening the specified time as the second condition. The control unit 12 can set a condition different from the first condition as the second condition. When the control unit 12 satisfies the second condition based on the first temperature, it can display the information in the second mode in a manner corresponding to the part of the display of the first temperature that satisfies the second condition. When the control unit 12 satisfies the second condition based on the change from the previous second temperature to the current first temperature, it can display the information in the second mode in a manner corresponding to the part of the display of the first temperature that satisfies the second condition.

[0092] The control unit 12 can determine to display the information of the first mode or the second mode when the risk level meets the specified conditions. The specified conditions for determining the display of the information of the first mode or the second mode based on the risk level are also referred to as the third conditions. For example, the control unit 12 can make a determination with the risk level being greater than or equal to a specified value as the third condition. Specifically, the control unit 12 can set the third condition in such a way that the information of the first mode is displayed when the risk level is greater than or equal to 0.95. The control unit 12 can set the third condition in such a way that the information of the second mode is displayed when the risk level is greater than or equal to 0.5 and less than 0.95. Values such as 0.5 or 0.95, which are used as the reference values for the control unit 12 to make a determination based on the value of the risk level, are not limited to the above values. The control unit 12 can appropriately set the reference value to other values. When the risk level meets the third condition, the control unit 12 can display the information of the first mode or the second mode in a manner corresponding to the part of the display of the first temperature that meets the third condition. When the risk level meets the third condition, the control unit 12 can display the information of the first mode or the second mode in a manner corresponding to the part of the display of the risk level that meets the third condition. When the risk level meets the third condition, the control unit 12 can display the information of the first mode in a manner corresponding to at least one of the part of the display of the first temperature that meets the third condition or the part of the display of the risk level that meets the third condition. When the risk level meets the third condition, the control unit 12 can display the information of the second mode in a manner corresponding to at least one of the part of the display of the first temperature that meets the third condition or the part of the display of the risk level that meets the third condition.

[0093] For example, Figure 6 , Figure 7 and Figure 8 The temperature at point A of

[0094] In addition, Figure 6 , Figure 7 and Figure 8The temperature at point B is higher than that of the surrounding points and rises sharply. In this case, the display of the temperature at point B indicates an abnormality caused by poor insulation of the cable 40 or the possibility of an abnormality due to various other factors that damage the cable 40. The control unit 12 can appropriately set the time interval for calculating the change amount of the temperature. The control unit 12 can set the first condition in such a way that information in the first mode for making it easy for a person to recognize the change of temperature over time can be displayed on the display device 30.

[0095] In addition, Figure 6 , Figure 7 and Figure 8 the temperature at point C is lower than that of the surrounding points and gradually starts to decrease from a past time close to the current time. In this case, the state of point C is different from a stable state such as point A and changes gradually. For example, the display at point C indicates that the buried position of the cable 40 at point C is gradually becoming shallower. In addition, in the display at point C, the range where the temperature decreases gradually expands, so the possibility of excavation is suspected. At a point where the state changes gradually like point C, the cable 40 is not actually damaged. Therefore, a person can make a plan for investigation or repair to deal with the abnormality at point C.

[0096] In Figure 8 the example, the control unit 12 displays the information in the first mode superimposed on the points where the duration of the current temperature is less than the specified time and the information in the second mode superimposed on the points where the duration of the current temperature is short but greater than or equal to the specified time in different shapes. That is, the information in the first mode and the information in the second mode can be distinguished by making displays with different shapes as shown in Figure 8 the example. The control unit 12 can display the information in the first mode and the information in the second mode with different chromaticities, lightnesses, or saturations. For example, the information in the first mode and the information in the second mode can be distinguished by making displays with different colors. For example, the information in the first mode can be displayed in red or the like. For example, the information in the second mode can be displayed in orange or yellow or the like. For example, the information in the first mode and the information in the second mode can be distinguished by making displays with different shades of colors. For example, the information in the first mode can be displayed in a dark color. For example, the information in the second mode can be displayed in a light color. The control unit 12 can distinguish and display one of the information in the first mode and the information in the second mode by flashing. The control unit 12 can display the information in the first mode and the information in the second mode with different flashing periods.

[0097] In Figure 6 or Figure 7In the graph of the risk level shown, the part with a larger risk level value, i.e., the mountain-shaped part of the graph, can be included in the information of the first method or the second method. Specifically, the part with a larger risk level value corresponding to point B can be included in the information of the first method. The part with a larger risk level value corresponding to point C can be included in the information of the second method.

[0098] Figure 6 The part indicating the temperature change in the illustrated image of the temperature trend can also be included in the information of the first method or the second method. Specifically, the pattern 61 corresponding to point B can be included in the information of the first method. The pattern 62 corresponding to point C can be included in the information of the second method. The display of the temperature trend can include information indicating the change from the second temperature measured at each temperature measurement position of the cable 40 at the previous second time to the first temperature measured at each temperature measurement position of the cable 40 at the current first time. In addition, the information indicating the change from the second temperature measured at each temperature measurement position of the cable 40 at the previous second time to the first temperature measured at each temperature measurement position of the cable 40 at the current first time can be included in the information of the first method or the second method. The control unit 12 can display the temperature trend in association with the graph of the measured temperature values, so that the information of the first method or the second method is displayed in association with the measured temperature values.

[0099] In Figure 7 The part indicating the part with a larger risk level value, i.e., the blackened part, in the illustrated image of the risk level trend can be included in the information of the first method or the second method. Specifically, the pattern 71 corresponding to point B can be included in the information of the first method. The pattern 72 corresponding to point C can be included in the information of the second method. The control unit 12 can display the risk level trend in association with the graph of the measured temperature values, so that the information of the first method or the second method is displayed in association with the measured temperature values.

[0100] As described above, the control unit 12 of the diagnostic device 10 can emphasize the characteristic part in the display of the measured temperature values. For example, the control unit 12 can display the information of the first method in superposition with the display of the measured temperature values, so that the information of the first method is displayed in association with the measured temperature values. In addition, the temperature trend or the risk level trend including the information of the first method can be displayed in association with the measured temperature values. By displaying the information of the first method in association with the measured temperature values, it is easy for personnel to grasp the information indicating the state of the cable 40. As a result of personnel easily grasping the information indicating the state of the cable 40, the accuracy of the diagnostic result of the state of the cable 40 can be improved.

[0101] The control unit 12 can use other display devices to notify the personnel of the highlight display in the display device 30, or can use other types of devices such as voice, vibration, or light to notify the personnel. In this way, it is difficult for the personnel to miss the change in the state of the cable 40. As a result, the change in the state of the cable 40 is always monitored.

[0102] <Example of flow of display method>

[0103] The control unit 12 of the diagnostic device 10 may execute a command including: Figure 9 The display method of the flow chart shown as an example can be realized as a display program executed by a processor or a computer constituting the control unit 12. The display program can be stored in a non-transitory computer-readable medium.

[0104] The control unit 12 obtains the measured values ​​of the temperature of each part of the cable 40 from the temperature measuring device 20 (step S1). Specifically, the control unit 12 obtains the measured values ​​of the temperature of each part of the cable 40 at each time, processes the measured values ​​of the temperature of each part of the cable 40 at the current time, that is, the first time, as the first temperature, and processes the measured values ​​of the temperature of each part of the cable 40 at the previous time, that is, the second time, as the second temperature.

[0105] The control unit 12 displays the first temperature on the display device 30 (step S2). The control unit 12 calculates the risk level based on the measured value of the temperature, and displays the risk level on the display device 30 (step S3).

[0106] The control unit 12 determines whether the predetermined condition is satisfied with respect to the measured value of the temperature or the degree of danger (step S4). Specifically, the control unit 12 can determine whether at least one of the first condition, the second condition, or the third condition is satisfied. The control unit 12 can determine whether all of the first condition, the second condition, and the third condition are satisfied. The control unit 12 is not limited to the first condition, the second condition, or the third condition, and can also determine whether various other conditions are satisfied.

[0107] When the predetermined condition is satisfied (step S4: YES), the control unit 12 displays information of a predetermined form corresponding to the satisfied condition on the display device 30 (step S5). Specifically, when the first condition is satisfied, the control unit 12 displays information of the first form on the display device 30. When the second condition is satisfied, the control unit 12 displays information of the second form on the display device 30. When the third condition is satisfied with respect to the risk level, the control unit 12 displays information of the first form or the second form on the display device 30.

[0108] When the specified conditions are not met (step S4: NO) or after step S5 is executed, the control unit 12 displays the temperature trend on the display device 30 (step S6). The control unit 12 may display the risk level trend on the display device 30 instead of the temperature trend. The control unit 12 may display both the temperature trend and the risk level trend on the display device 30. Regardless of the determination result of the determination process in step S4, the temperature trend or the risk level trend may include the display of information in the first mode or the second mode. After the control unit 12 executes the process of step S6, it ends Figure 9 the execution of the process of the flowchart.

[0109] The control unit 12 may Figure 9 not execute the risk level display process of step S3 in the process of the flowchart shown as an example. The control unit 12 may not execute the display process of the temperature trend or the risk level trend of step S3.

[0110] <Subsection>

[0111] As described above, regarding the diagnostic system 1 according to the present embodiment, the diagnostic device 10 can display various types of information, such as the first mode or the second mode, based on the temperature of each part of the cable 40, which is the object of diagnosis, in association with the measured value of the temperature on the display device 30. By displaying various types of information in association with the display of the measured value of the temperature, it is easy for personnel to grasp the information indicating the state of the cable 40. As a result of personnel easily grasping the information indicating the state of the cable 40, the accuracy of the diagnostic result of the state of the cable 40 can be improved. Thus, it is easy for personnel to identify the state of each part of the cable 40, which is the object of diagnosis. As a result, the accuracy of the diagnostic result of the state of the cable 40 can be improved.

[0112] The diagnostic device 10 can separately display information in the first mode or the second mode on the display device 30 as information associated with the measured value of the temperature. By separately displaying information in the first mode or the second mode as information associated with the measured value of the temperature, it becomes easy for a person to grasp that the possibility of a state abnormality of the cable 40 at the position where the information in the first mode is displayed is lower than that of the cable 40 at the position where the information in the second mode is displayed. By making the display mode different according to the level of the possibility that the state of the cable 40 becomes abnormal, a person can obtain a judgment material for diagnosing whether the state of the cable 40 is abnormal. As a result of the person obtaining the judgment material, the accuracy of the diagnosis result of the state of the cable 40 can be improved. In addition, the diagnostic device 10 can notify a person that information in the first mode or the second mode is displayed on the display device 30. As a result, it is difficult for a person to miss a change in the state of the cable 40. As a result, the change in the state of the cable 40 can always be monitored. A person can remotely confirm the content displayed on the display device 30 by using the diagnostic system 1 and diagnose the state of the cable 40, which is the object to be diagnosed. As a result, the frequency of a person or the like visiting the site where the cable 40 is buried and the visit cost can be reduced. In addition, the reliability of the cable 40 is improved by achieving continuous monitoring.

[0113] (Other embodiments)

[0114] Next, other embodiments will be described.

[0115] <Other examples of the object to be diagnosed>

[0116] The diagnostic system 1 is not limited to the submarine cable of the offshore wind power generation device 70 described above, and can also be applied to the diagnosis of the states of various other cables 40. The diagnostic system 1 can be applied to, for example, the diagnosis of the state of a submarine cable for supplying power or communication to an isolated island or the like. The diagnostic system 1 can be applied to the diagnosis of the state of a cable 40 laid on land. For example, even on land, it can be applied to the diagnosis of the state of a cable 40 buried in the ground or a cable 40 laid in a mountainous area or other areas where it is difficult for people to enter. The diagnostic system 1 can be applied to the diagnosis of the aging state of the cable 40. The diagnostic system 1 can be applied to the diagnosis of the water immersion state of the cable 40.

[0117] The embodiments related to the present invention have been described based on the respective drawings and examples, but it should be noted that those skilled in the art can make various deformations or changes based on the present invention. Therefore, it should be noted that the above-mentioned deformations or changes are included in the scope of the present invention. For example, the functions and the like included in each structural part can be reconfigured in a logically consistent manner, and multiple structural parts can be combined into one or divided.

[0118] Explanation of reference numerals

[0119] 1 Diagnostic System

[0120] 10 Diagnostic Device (12: Control Unit, 14: Storage Unit, 16: Interface)

[0121] 20 Temperature Measuring Device

[0122] 30 Display Device (32: Control Unit, 34: Storage Unit, 36: Display Unit)

[0123] 40 Cable (41: Electric Wire, 42: Optical Fiber, 43: Coating, 51: Buried Portion, 52: Exposed Portion, 53: Buried Portion, 54: Shallow Buried Portion, 55: Boundary Portion)

[0124] 61, 62, 63, 71, 72 Characteristic Patterns

[0125] 70 Offshore Wind Power Generation Device

[0126] 80 Underground

[0127] 81 Seabed

[0128] 84 Sea

[0129] 91 First Mark

[0130] 92 Second Mark

Claims

1. A display method, wherein, the display method includes the following steps: obtaining a measured value of the temperature at at least one temperature measurement position of the cable at a first time as a first temperature; displaying the first temperature at the at least one temperature measurement position; and when there is a position among the at least one temperature measurement positions that satisfies a first condition based on the first temperature, displaying information of a first mode as information for determining whether the state of the cable is abnormal at the position that satisfies the first condition in a manner corresponding to the position that satisfies the first condition in the display of the first temperature.

2. The display method according to claim 1, wherein, the display method further includes the following steps: obtaining a measured value of the temperature at the temperature measurement position at a second time before the first time as a second temperature; and when the first condition is satisfied based on the change from the second temperature to the first temperature, displaying the information of the first mode in a manner corresponding to the part that satisfies the first condition in the display of the first temperature.

3. The display method according to claim 2, wherein, the display method further includes the following step of displaying information indicating the change from the second temperature to the first temperature.

4. The display method according to claim 3, wherein, the information indicating the change from the second temperature to the first temperature includes the information of the first mode.

5. The display method according to claim 1, wherein, the display method further includes the following step of displaying information of a second mode in a manner corresponding to the part that satisfies a second condition in the display of the first temperature when the second condition is satisfied based on the first temperature.

6. The display method according to claim 2, wherein, the display method further includes the following steps: calculating a risk level based on the first temperature and the second temperature; and displaying the risk level in a manner corresponding to the display of the first temperature.

7. The display method according to claim 6, wherein, the display method further includes the following step of displaying the information of the first mode in a manner corresponding to at least one of the part that satisfies the third condition in the display of the first temperature or the part that satisfies the third condition in the display of the risk level when the risk level satisfies a third condition.

8. A display program, wherein, the display program causes a computer to execute the display method according to any one of claims 1 to 7.

9. A diagnostic device, wherein, the diagnostic device has a control unit that executes the display method according to any one of claims 1 to 7.

Images