Diagnostic device, diagnostic method, and diagnostic system

Abstract

To provide a diagnosis device, a diagnosis method, and a diagnosis system with which it is possible to more easily detect an abnormality of a fastening member of an electric power apparatus.SOLUTION: The diagnosis device according to an embodiment has an acquisition unit and a diagnosis unit. The acquisition unit acquires vibration information pertaining to a vibration applied to a plurality of conductors that supply a multi-phase alternating current to a load after the vibration has propagated to other conductors fastened to a conductor by a prescribed fastening member, for a plurality of combinations of the conductor and the other conductors. When the plurality of pieces of acquired vibration information reveal that the vibration information in any one combination of the plurality of combinations has the natural frequency of vibration that is different from the vibration information in the other combinations, the diagnosis unit diagnoses that an abnormality exists in the fastening member.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] SUMMARY OF THE DISCLOSURE Embodiments of the present invention relate to diagnostic devices, methods and systems. [Background technology]

[0002] Preventive maintenance is carried out on electric power equipment such as substation facilities through regular inspections and condition monitoring. Electric power equipment can overheat locally due to initial defects, deterioration over time, or damage. Electric equipment that is locally heated can burn out or cause an accident. The connecting parts may overheat due to loosening of fastening members such as bolts. The company detects loosening of fastening members by applying vibration to the conductor. In this method, it was necessary to acquire the vibration characteristics of the object under normal conditions in advance. For electric power equipment for which the vibration characteristics of the current state have not been acquired, it is not possible to detect abnormalities such as loosening of fastening members. There were cases where it was not possible to [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5674935 [Patent Document 2] Patent No. 4377765 [Patent Document 3] Patent No. 3560830 Summary of the Invention [Problem to be solved by the invention]

[0004] The problem to be solved by the present invention is to more easily detect an abnormality in a fastening member of an electric power device. The object of the present invention is to provide a diagnostic device, a diagnostic method, and a diagnostic system that can achieve the above. [Means for solving the problem]

[0005] The diagnostic device according to the embodiment includes an acquisition unit and a diagnosis unit. The acquisition unit is a unit for supplying a multi-phase alternating current to a load. R Each phase is a combination of a conductor and another conductor fastened by a specified fastening member. , the conductor The vibration given to Through the fastening member The vibration after being transmitted to another conductor Vibration information related to movement is The above The diagnostic unit obtains the combination. The plurality of vibration information pieces are vibration pieces in any one of the plurality of combinations. When the dynamic information is a natural frequency of vibration different from the vibration information in other combinations, It is diagnosed that there is an abnormality in the fastening components. [Brief description of the drawings]

[0006] [Figure 1] FIG. 13 is a diagram showing a specific example of a device configuration for detecting loosening of a fastening member based on vibration characteristics of an embodiment. [Diagram 2] 1 is a functional block diagram showing a diagnostic device 100 according to an embodiment. [Diagram 3] 5 is a flowchart showing a process flow for diagnosing a conductor fastening portion 20 according to the embodiment. [Figure 4] 11 is a diagram showing a specific example of a measurement result when loosening occurs in a conductor fastening portion 20w of a three-phase conductor of the embodiment. FIG. [Diagram 5] FIG. 2 is a diagram showing a specific example of an equipment configuration in which two vibration measuring devices according to an embodiment are installed to detect loosening of a fastening member. [Figure 6] FIG. 13 is a diagram showing a specific example of a measurement result when diagnosis is performed based on a vibration damping rate in the embodiment. [Figure 7] 11A and 11B are diagrams showing a specific example of a measurement result when diagnosis is performed based on a natural frequency according to the embodiment. [Figure 8] FIG. 2 is a diagram showing a specific example of a device configuration having a plurality of conductor fastening portions according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] Hereinafter, a diagnostic device, a diagnostic method, and a diagnostic system according to embodiments will be described with reference to the drawings.

[0008] FIG. 1 shows an example of a device configuration for detecting loosening of a fastening member based on vibration characteristics according to an embodiment. The fastening member is a member for fastening conductors that supply power to a load. Electricity is provided by industrial power equipment. Industrial power equipment includes circuit breakers, disconnectors, The power equipment for industrial use is composed of devices such as current transformers and voltage transformers (neither of which are shown in the figure). In the event of an abnormality, the power supply is cut off. Power is supplied to the load by three-phase AC. The load is, for example, a factory facility or building facility. In three-phase AC, the power equipment receives three-phase power. Therefore, the conductors for supplying power from the power equipment to the load are three-phase The conductors of the three phases are all the same. In the embodiment, the three phases are The first phase, the second phase, and the third phase will be described. In the embodiment, the three-phase AC will be described. However, it is not limited to three-phase AC. For example, power equipment may be a multi-phase device that supplies power of two or more phases. Any type of AC device may be used.

[0009] In the first phase, a power device (not shown) connects a load (not shown) to a conductor 10u and a conductor 11u. The conductor 10u and the conductor 11u are made of copper or aluminum. The conductor 10u and the conductor 11u are covered with an insulator such as resin. The conductor 10u and the conductor 11u are fastened to each other by a conductor fastening portion 20u. The conductor 11u and the conductor 11u have holes at their ends. Fastening members such as bolts and screws are inserted into the holes. .

[0010] The conductor fastening portion 20u represents the position where the conductor 10u and the conductor 11u are fastened to each other. The conductor 10u is provided with a fastening member 21u. The fastening member 21u fastens the conductor 10u and the conductor 11u. The conductor 10u and the conductor 11u are fastened together by being inserted into holes formed in the conductor 10u and the conductor 11u and being fastened together. The fastening member 21u is, for example, a bolt or a screw.

[0011] Here, an example of an overheating phenomenon caused by loosening of the fastening member 21u between the conductor 10u and the conductor 11u is shown. When the fastening member 21u is fixed with a predetermined tightening torque, the conductor 1 The contact resistance between 0u and conductor 11u is stabilized. The contact resistance is preferably on the order of several μohms. When the conductor 10u and the conductor 11u are fixed with a predetermined tightening torque, However, the fastening member 21u may be insufficiently fastened or may become stuck. When the fastening member 21u is loosened, the conductor 10u and The contact pressure with the conductor 11u is reduced. Due to the reduction in the contact pressure, the conductor 10u and the conductor 11u Therefore, the current flowing between the conductor 10u and the conductor 11u decreases. The current is concentrated at the reduced contact points, causing heat to be generated at the contact points. The heat causes the oxidation of the surfaces of the conductors 10u and 11u to progress. The contact resistance increases. Also, when the temperature rises, the conductor softens and changes shape, such as warping. If the contact resistance between the conductor 10u and the conductor 11u exceeds several hundred μohms, the current The current does not flow between the body 10u and the conductor 11u, but is concentrated at the fastening member 21u. 21u will overheat and melt.

[0012] In this embodiment, vibration is applied to the conductor to obtain the vibration characteristics. The vibration means 30u and the vibration measuring device 40u are arranged so as to sandwich the joint 20u. The vibration means 30u is disposed on the conductor 10u. The vibration measuring device 40u is disposed on the conductor 11u. The vibration means 30u applies vibration to the conductor 10u. The method may be a mechanical device such as an exciter equipped with a rotor, or a manual method such as a hammer. The vibration applied to the conductor 10u passes through the conductor fastening portion 20u and is then transmitted to the conductor 11. The vibration transmitted to the conductor 11u reaches a vibration measuring device 40u.

[0013] The vibration measuring device 40u acquires the vibration characteristics applied to the conductor 10u by the vibration applying means 30u. The vibration measuring device 40u is a sensor that detects contact-type acceleration such as a piezoelectric element or a strain gauge. Alternatively, it may be a non-contact type displacement sensor that measures capacitance or eddy current. The vibration measuring device 40u outputs the acquired vibration characteristics to the diagnostic device 100. The vibration characteristics are The vibration characteristic of the conductor on which the vibration measuring device 40u is installed is shown. The vibration characteristic is determined by the vibration applying means 30u. It represents the characteristics of the vibration of a conductor caused by a given vibration. The vibration characteristic may be an absolute value of the amplitude of the vibration. The vibration characteristic may be a natural frequency. This is a specific example of vibration information. The vibration information is generated by supplying currents with different phases to a load. Vibrations applied to multiple conductors are transmitted to other conductors fastened to the conductors by a specified fastening member. This is information about the vibration after it is reached.

[0014] In the first phase, the vibration applied to the conductor 10u is transmitted through the conductor 10u and the fastening member 21u. When the fastening member 21u is loose or has a fastening defect, the force is attenuated. In this case, the contact pressure pressing the conductor 10u and the conductor 11u together is reduced. In this case, the vibration measuring device 40u is prevented from transmitting the vibration from the conductor 10u to the conductor 11u. A vibration characteristic is obtained that indicates that the vibration achieved is small.

[0015] Such a conductor configuration is installed for each phase of the three-phase AC. The body 10v and the conductor 11v are fastened by a fastening member 21v. A vibration measuring device 40v is disposed at the end of the conductor 11v. The connecting member 21v is provided in the conductor fastening portion 20v. The conductor fastening portion 20v connects the conductor 10v and the conductor This represents the position where the body 11v is fastened.

[0016] In the third phase, the conductor 10w and the conductor 11w are fastened together by a fastening member 21w. A vibration measuring device 4 is disposed at the end of the conductor 11w. The fastening member 21w is provided in the conductor fastening portion 20w. The letter w represents the position where the conductor 10w and the conductor 11w are fastened together. When there is no distinction between the conductor 10, the fastening member, the vibration means and the vibration measuring device, The components are referred to as a body 11, a conductor fastening portion 20, a fastening member 21, a vibration applying means 30, and a vibration measuring device 40. do.

[0017] In this way, the second and third phases have the same structure as the first phase. All the fastening members 21 are normal (for example, fixed with a predetermined tightening torque). In this case, the vibration characteristics transmitted through the conductors 10 and 11 are the same for both phases. On the other hand, in a phase where the fastening member 21 is loose or otherwise abnormal, the vibration characteristics change. The diagnostic device 100 diagnoses an abnormality in the fastening member 21 based on the three-phase vibration characteristics.

[0018] FIG. 2 is a functional block diagram showing a diagnostic device 100 according to an embodiment. The diagnostic device 100 includes: Information on personal computers, smartphones, tablet computers, servers, etc. The diagnostic device 100 diagnoses whether or not there is an abnormality in the conductor fastening portion 20. An abnormality in the conductor fastening portion 20 is, for example, looseness or improper fastening of the fastening member 21. The diagnostic device 100 acquires vibration characteristics of the conductor fastening portion 20. The diagnostic device 100 analyzes the vibration characteristics. The conductor fastening unit 20 is diagnosed for an abnormality based on parameters obtained by the above measurement. 100 executes a diagnostic program to configure a communication unit 101, an output unit 102, and a control unit. The device functions as a device having a unit 103.

[0019] The communication unit 101 is a network interface. The communication unit 101 communicates with an external communication device via a wireless LAN (Local Area Network). network), wired LAN, Bluetooth (registered trademark) or LTE (Long Term Evolution Communication may be performed using a communication method such as WiFi (registered trademark).

[0020] The output unit 102 outputs the diagnostic device 100 to an output device (not shown) connected to the diagnostic device 100. The output device outputs data to the user. For example, an output device outputs images and text to a screen. For example, the output device may be a CRT (Cathode Ray Tube) or It can be configured using LCD displays, organic EL (Electro Luminescence) displays, etc. The output device is configured using a device that prints images and characters on a sheet. For example, the output device may be configured using an inkjet printer, a laser printer, etc. The output device may be configured using a device that converts characters into voice and outputs the voice. In this case, the output device is configured using a voice synthesizer and a voice output device (speaker). The output device is configured using a light-emitting device such as an LED (Light Emitting Diode). The output unit 102 may output information to other information processing devices via a communication device provided in the diagnostic device 100. The user may transmit the result of the judgment to the device. For example, the user may check the fastening members of the electrical device. The inspector may also be an inspector who performs the inspection.

[0021] The control unit 103 controls the operation of each unit of the diagnostic device 100. The control unit 103 is, for example, Processors such as PU (Central Processing Unit) and RAM (Random Access Memory) The control unit 103 executes the diagnostic program. Together, they function as a diagnostic information generating unit 131 and a diagnostic unit 132 .

[0022] The diagnostic information generating unit 131 generates diagnostic information based on the vibration characteristics. The information generating unit 131 receives the vibrations from the vibration measuring device 40u, the vibration measuring device 40v, and the vibration measuring device 40w. The diagnostic information generating unit 131 acquires vibration characteristics for each of the three vibration characteristics. The diagnostic information is used to diagnose whether or not there is an abnormality in the conductor fastening portion 20. The diagnostic information is information obtained based on the amplitude and time. This information is generated for each of the first to third phases.

[0023] The diagnostic information generating unit 131 calculates the absolute value of the amplitude and the time for each of the first to third phases, for example. The diagnostic information generating unit 131 may generate diagnostic information that corresponds to the interval. For example, the amplitude of vibration measured near the vibration applying means 30 and the amplitude of vibration measured by the vibration measuring device 40 are The vibration damping rate may be calculated based on the vibration amplitude. The information generating unit 131 associates the vibration damping rate with time for each of the first to third phases. The diagnostic information generating unit 131 may generate the above-mentioned information as diagnostic information. For each phase from the first to the third phase, information that associates the natural frequency with the amplitude is generated as diagnostic information. The diagnostic information generating unit 131 is a specific example of the location of the acquiring unit. is obtained for each conductor.

[0024] The diagnosing unit 132 diagnoses whether or not there is an abnormality in the conductor fastening unit 20 based on the diagnosis information. Specifically, the diagnosis unit 132 performs the following on the amplitude of each of the first to third phases included in the diagnosis information: The conductor fastening portion 20 is diagnosed based on the information obtained based on the above and information associated with time. For example, if the fastening member 21 fastening the conductors 10 and 11 becomes loose, the vibration between the conductors may be reduced. Therefore, the fastening member 21 in the conductor fastening portion 20 of a certain phase is not fastened. When an abnormality such as poor fastening or loosening occurs, the transmission of vibration is limited to the conductor fastening part 2 in the phase having the abnormality. 0. As a result, in the phase having an abnormality, the fastening member 21 is normally fastened. The amplitude of the phase is attenuated more than the amplitude of the phase in which the current signal is detected. By diagnosing whether there is a change in vibration characteristics due to damping such as The conductor fastening unit 20 is diagnosed for an abnormality. The diagnosing unit 132 outputs the diagnosis result to the output unit 102. The diagnosis result includes information indicating whether or not there is an abnormality in the conductor fastening portion 20. If an abnormality is found, the diagnosis result may include information indicating in which phase the abnormality is found. The diagnosis unit 132 may transmit the diagnosis result to an external communication device via the communication unit 101. The diagnosis unit 132 may receive, for example, an e-mail, an SMS (Short Message Service), or Message Char The diagnosis result may be transmitted using a predetermined communication means such as the above. In this case, A communication means and a transmission destination of the diagnosis result are stored in advance in 132 .

[0025] FIG. 3 is a flowchart showing a process flow for diagnosing the conductor fastening portion 20 according to the embodiment. The diagnosis of the electric device is performed at a predetermined timing. This may be at the time of scheduled maintenance, or when an abnormality occurs in electrical equipment. First, the user installs the vibration measuring device 40 on the conductor 11 (step S101 Specifically, the user places a vibration measurement device at a location where the conductor fastening portion 20 to be diagnosed can be diagnosed. The user installs a vibration measuring device 40 for each phase from the first phase to the third phase. The user installs each vibration measuring device 40 at a position equivalent to the position of the conductor fastening portion 20 to be diagnosed. The vibration means 30 applies vibration to the conductor 10 (step S102). The vibration means 30 is arranged to sandwich the conductor fastening portion 20 from the location where the vibration measuring device 40 is installed. The vibration means 30 is a device such as an exciter equipped with an electric actuator. The vibration may be by a mechanical means or by a manual means such as a hammer. It is desirable that both phases are applied by the same vibration means 30.

[0026] The vibration measuring device 40 acquires the vibration characteristics applied to the conductor 10 by the vibration applying means 30 ( Step S103). The diagnostic information generating unit 131 receives the vibration characteristics from the vibration measuring device 40. The diagnostic information generating unit 131 generates diagnostic information based on the three acquired vibration characteristics. (Step S104).

[0027] The diagnosis unit 132 diagnoses whether or not there is an abnormality in the conductor fastening unit 20 based on the diagnosis information ( Step S105). If it is determined that there is an abnormality (Step S105: YES), the diagnosis The diagnostic unit 132 outputs a diagnosis result indicating that there is an abnormality in the conductor fastening unit 20 to the output unit 102 ( (Step S106) If it is determined that there is no abnormality (Step S105: NO), the diagnosis unit 132 outputs to the output unit 102 a diagnosis result indicating that there is no abnormality in the conductor fastening unit 20 (step Step S107).

[0028] FIG. 4 shows the measurement results when the conductor fastening portion 20w of the three-phase conductor of the embodiment becomes loose. FIG. 1 is a diagram showing a specific example of the results of the measurement. Such measurement results are, for example, the first to third phases. This is one form of diagnostic information in which the absolute value of the amplitude and the time when the amplitude occurred are associated with each other for each phase. In the graph, the vertical axis is the absolute value of the amplitude, and the horizontal axis is time. Time is the time when the amplitude occurs. When the vibration means 30 applies vibration to the conductor 10, the vibration is applied with a constant amplitude for all three phases. When the conductors 10 and 11 have the same configuration, the vibration measuring device 40 determines that the fastening state of the conductors 10 and 11 is normal. In other words, the vibration characteristics are obtained by obtaining the same absolute value of the amplitude. On the other hand, if there is an abnormality in the fastening state of the conductor 10 and the conductor 11, the vibration measuring device 40 It acquires vibration characteristics different from the other phases.

[0029] According to Figure 4, the first and second phases have almost the same amplitude. The amplitude of the first phase is smaller than that of the second phase. The diagnosis unit 132 calculates the difference between the absolute values ​​of the amplitudes in the second phase and the third phase. The diagnosis unit 132 calculates the difference between the absolute values ​​of the amplitudes in the first phase and the third phase. The diagnosis unit 132 determines whether the difference between the three calculated absolute values ​​is within a predetermined range. The predetermined range is a range in which the conductor fastening portion 20 is considered to be normal. The value of the predetermined range is a value determined in advance. If the difference between the three absolute values ​​is within a predetermined range, the conductor fastening portion 20 is diagnosed as normal. If the difference between the three calculated absolute values ​​is not within a predetermined range, the diagnosis unit 132 In this case, the diagnosing unit 132 diagnoses that there is an abnormality in the conductor fastening unit 20. The conductor fastening portion 20 of the phase with the smallest absolute value of the amplitude is diagnosed as having an abnormality. Therefore, the diagnosis unit 132 diagnoses that there is an abnormality in the conductor fastening unit 20 of the third phase. In the phase where there is an abnormality such as insufficient tightening or looseness in the knot 20, the attenuation of the amplitude becomes large. The unit 132 detects the presence or absence of an abnormality by detecting such a difference in amplitude based on the diagnosis information. Diagnose.

[0030] FIG. 5 shows an equipment configuration for detecting loosening of a fastening member by installing two vibration measuring devices according to the embodiment. In the device configuration of FIG. 5, in the first phase, the vibration measuring device 41u More specifically, the vibration measuring device 41u is disposed near the vibration means 30u. The vibration measuring device 41u is disposed on the same conductor as the vibration measuring device 30u (for example, the conductor 10u). The vibration measuring device 41u measures the vibration characteristics of the conductor 10u by the piezoelectric transducer 30u. The sensor may be a contact type sensor that detects acceleration such as an element or a strain gauge, or may be a capacitance sensor or The vibration measuring device 41u may be a non-contact type displacement sensor that measures eddy currents. It is preferable that the vibration measuring device 41 is a sensor that obtains vibration characteristics by the same means as the vibration measuring device 40u. u outputs the acquired vibration characteristics to the diagnostic device 100.

[0031] Such a vibration measuring device 41 is installed on each phase of the three-phase AC. A vibration measuring device 41v is disposed in the first phase. A vibration measuring device 41w is disposed in the third phase. When there is no need to distinguish which vibration measuring instrument 41 is being used, it will be simply referred to as the vibration measuring instrument 41. By disposing the vibration measuring device 41 in this manner, the diagnostic device 100 The amplitude of vibration measured by the measuring device 41 and the amplitude of vibration measured by the vibration measuring device 40 The diagnostic device 100 can calculate the vibration damping rate based on the calculated vibration. Based on the damping rate of the vibration, an abnormality in the conductor fastening portion 20 can be diagnosed. Even if the strength of the vibration applied to the conductor 10 from the vibration applying means 30 differs for each phase, It is possible to diagnose abnormalities.

[0032] In the configuration of FIG. 5, when diagnosing an abnormality in the conductor fastening portion 20, the diagnostic information is generated by the diagnostic device 100. The generating unit 131 may generate the diagnostic information by, for example, the following process. The following description will be given assuming that the characteristic is an absolute value of the amplitude. Based on the vibration characteristics, the vibration damping rate of each phase is calculated. 1 is a vibration measuring device 40 that measures the amplitude of vibration. The diagnostic information generating unit 131 calculates the damping rate by dividing the amplitude of the vibration from the first phase. The diagnostic information generating unit 131 calculates the attenuation rate for each of the first to third phases. For each phase up to the third phase, information that correlates the vibration damping rate and the occurrence time of the amplitude is collected as diagnostic information. Generate.

[0033] FIG. 6 shows a specific example of a measurement result when diagnosis is performed based on the vibration damping rate of the embodiment. FIG. 6 is a diagram showing the vibration when the conductor fastening portion 20w of the third phase becomes loose. 6 shows an example of measurements made by a measuring device 40 and a vibration measuring device 41. In Fig. 6, the vertical axis represents amplitude. The horizontal axis is time. Time is the time when the amplitude occurs. The dashed line in Figure 6 is the time when the vibration measurement device 4 The solid line in FIG. 6 represents the absolute value of the amplitude measured by the vibration measuring device 40. 6, the absolute value of the amplitude measured by the vibration measuring device 41 is shown. There is no significant difference in the values ​​from the first to third phases. Therefore, there is no significant difference in the absolute value of the measured amplitude between the first and second phases. It can be seen that the absolute value of the amplitude of the third phase is smaller than those of the first and second phases. .

[0034] Here, the peak value of the absolute value of the amplitude measured by the vibration measuring device 41 is defined as A0. The peak value of the absolute value of the amplitude measured by the dynamic measuring device 40 is defined as A1. 131 generates diagnostic information by calculating the damping rate of each phase by dividing A1 by A0. The diagnosing unit 132 diagnoses an abnormality in the conductor fastening unit 20 based on the attenuation rate of each phase. Specifically, the diagnosis unit 132 compares the attenuation rates of the respective phases to determine whether any one of the conductor fastening units For example, the diagnosis unit 132 diagnoses whether or not there is an abnormality in the first phase, the second phase, and the third phase. The attenuation rates of the phases are compared, and for the phase with a greater attenuation rate than the other two phases, a different attenuation is applied to the conductor fastening portion 20. When comparing the attenuation rates, the diagnosis unit 132 may diagnose that there is a problem. Alternatively, the difference from the reference attenuation rate may be calculated. The unit 132 detects whether the attenuation rate of the phase having a larger attenuation rate than the other two phases is greater than a predetermined threshold value. The conductor fastening portion 20 may be diagnosed as having an abnormality when the predetermined threshold value is a threshold value related to the attenuation rate. The predetermined threshold may be any threshold value that is determined in advance. The unit 132 compares the attenuation rates of the amplitudes based on the diagnosis information to diagnose whether or not there is an abnormality. You may decline.

[0035] The diagnostic device 100 obtains the natural frequency as a vibration characteristic and compares it between each phase to determine the conductor tightening. The natural frequency may be determined based on the mechanical properties of the material, structure, dimensions, etc. of the vibrating object. This characteristic is determined by various physical properties. Or, if an abnormality such as a tightening defect occurs, the continuity of the material and the restraint state change, and the inherent vibration The vibration measuring device 40 detects the vibration frequency at which the maximum value changes according to the change in the natural frequency. The diagnostic device 100 obtains vibration characteristics that indicate the maximum of each phase. If a difference in the natural frequency is found, the conductor fastening portion 20 of each phase is diagnosed as being abnormal. It is possible.

[0036] FIG. 7 shows a specific example of a measurement result when diagnosis is performed based on the natural frequency of the embodiment. FIG. 7 shows the vibration meter when the conductor fastening portion 20w of the third phase is loosened. 7 shows an example of measurement using the measuring device 40. In FIG. 7, the vertical axis represents amplitude and the horizontal axis represents frequency. In FIG. 7, the natural frequencies are represented as f1, f2, and f3. In FIG. 7, the natural frequencies are represented as f1, f2, and f3. In the first and second phases, the natural frequencies of f1, f2, and f3 are observed. Since the joints are normally fastened, they show almost the same natural frequency. Since the member 21 is not properly fastened, the natural frequency f3 is lower than that of the first and second phases. The frequency shifts toward the upper limit.

[0037] When the natural frequency is acquired as the vibration characteristic, the diagnosis information generating unit 131 The information corresponding to the amplitude at the natural frequency is generated as diagnostic information. The generating unit 131 associates a natural frequency with an amplitude at that natural frequency for each phase. The diagnostic unit 132 generates diagnostic information. The diagnostic unit 132 diagnoses the characteristic of the conductor fastening unit 20 based on the natural frequency of each phase. Specifically, the diagnosing unit 132 diagnoses an abnormality by detecting the natural frequency of each phase at which the amplitude is detected. The diagnosis unit 132 compares the identified natural frequencies for each phase to identify For example, the diagnosing unit 132 diagnoses whether or not there is an abnormality in one of the conductor fastening units 20. The difference between the frequencies may be calculated, or the difference between the numbers of the identified natural frequencies may be calculated. When diagnosing an abnormality, the diagnosing unit 132 determines whether the difference between the natural frequencies is greater than a predetermined threshold value. If the difference is larger than the threshold value, the conductor fastening portion 20 may be diagnosed as having an abnormality. The threshold is related to the vibration frequency. Any threshold can be used as long as it is a predetermined threshold. The diagnostic device 100 may detect a change in the natural frequency caused by the structure of the conductor fastening portion 20. Based on this, an abnormality such as loosening or improper tightening of the fastening member 21 occurs in the conductor fastening portion 20. It is possible to diagnose whether or not

[0038] In the diagnostic device 100 configured in this manner, the vibration applied to the conductor 10 of each phase by the vibration means 30 The vibration measurement device 40 obtains the vibration characteristics of the vibration. 2 diagnoses the presence or absence of an abnormality in the conductor fastening portion 20 based on the vibration characteristics of each phase. For example, The diagnosis unit 132 detects whether any one of the vibration characteristics for each phase has a vibration characteristic different from the other phases. If so, the diagnostic device 100 diagnoses that the conductor fastening portion 20 has an abnormality. It is possible to diagnose abnormalities without acquiring the vibration characteristics of the fastening member 21 in normal conditions in advance. Therefore, the diagnostic device 100 can more easily detect the loosening of the fastening members 21 of the electric power equipment. Conclusion Add It becomes possible to diagnose abnormalities such as defects.

[0039] The diagnostic device 100 may also use a vibration damping rate as the vibration characteristic. 0 is affected by the strength of the vibration applied to the conductor 10 by using the attenuation rate as an index. For example, a hammer or the like is used as the vibration means 30, and an abnormality can be diagnosed without any human intervention. When a diagnostic device applies vibration, it is difficult to apply vibration of the same strength every time. 00 is the attenuation rate for each phase, even if it is difficult to simply compare the absolute value of the amplitude. By comparing the above, it becomes possible to more easily diagnose abnormalities in the fastening member 21.

[0040] <Modification> In the above embodiment, the conductor fastening portion 20 is provided between the vibration applying means 30 and the vibration measuring device 40. However, the present invention is not limited to one. For example, the conductor fastening portion 20 may be configured to be sandwiched between the vibration means 3. 8 shows an embodiment of a multiple conductor clamping device. This is a diagram showing a specific example of a device configuration having a connection part. The following describes the differences from the device configuration in FIG. In the first phase, the conductor 10u and the conductor 11u are fastened to each other by the conductor fastening portion 20u. In the first phase, the conductor 11u and the conductor 12u are fastened to each other at a conductor fastening portion 22u. The conductor fastening portion 22u represents the position where the conductor 11u and the conductor 12u are fastened to each other. The fastening member 23u is provided on the conductor 11u and the conductor 12u. The conductor 11u and the conductor 12u are fastened together by being inserted into holes formed in the conductor 11u and the conductor 12u and being fastened together. The fastening member 23u may be the same member as the fastening member 21u, such as a bolt or a screw. The vibration measuring device 40 is disposed at the end of the conductor 12u instead of at the end of the conductor 11u.

[0041] Such a conductor configuration is installed for each phase of the three-phase AC. The body 11v and the conductor 12v are fastened by a fastening member 23v. A dynamic measuring device 40v is disposed on the conductor fastening portion 22v. The fastening member 23v is provided on the conductor fastening portion 22v. Fastening portion 22v represents the position where conductor 11v and conductor 12v are fastened together.

[0042] In the third phase, the conductor 11w and the conductor 12w are fastened together by a fastening member 23w. A vibration measuring device 40w is disposed at the end of the body 12w. The conductor fastening portion 22w represents the position where the conductor 11w and the conductor 12w are fastened to each other. Below, we will distinguish which conductors, conductor fastening parts, fastening members, vibration means, and vibration measuring devices are involved. When no distinction is made, the following description will simply refer to the conductor 12, the conductor fastening portion 22, and the fastening member 23.

[0043] In this way, the second and third phases have the same structure as the first phase. All the fastening members 23 are normal (for example, fixed with a predetermined tightening torque). In this case, the vibration characteristics transmitted through the conductors 11 and 12 are the same for both phases. On the other hand, in the phase where the fastening member 23 is loose or otherwise abnormal, the vibration characteristics change. The diagnostic device 100 detects one or more of the conductor fastening units 20 and 22. If an abnormality occurs in the diagnostic device 100, the abnormality can be detected. This makes it possible to diagnose abnormalities in a wider range of conductor fastening portions with fewer tests.

[0044] The diagnostic information generating unit 131 may generate the diagnostic information by calculating the average value of the amplitude. In this case, the vibration means 30 applies a plurality of vibrations to the conductor 10. The diagnostic device 100 transmits a plurality of vibration characteristics corresponding to the number of vibrations applied. The diagnostic information generating unit 131 calculates an average value of the amplitudes of the acquired vibration characteristics. 131 may generate diagnostic information based on the calculated average value.

[0045] The diagnostic information generating unit 131 may also obtain the amplitude for each frequency and generate the diagnostic information. In this case, the diagnostic information generating unit 131 performs a Fourier transform on the vibration characteristics to obtain the peripheral The diagnostic information generating unit 131 then obtains the amplitude for each frequency and performs diagnostic The information may be generated.

[0046] The diagnostic device 100 is a set of a plurality of information processing devices connected to each other so as to be able to communicate with each other via a network. In this case, each functional unit of the diagnostic device 100 may be implemented using a plurality of pieces of information. For example, the diagnostic information generating unit 131 and the diagnostic unit 132 may be implemented in a distributed manner in a processing device. may be implemented in different information processing devices.

[0047] In each of the above embodiments, the diagnostic information generating unit 131 and the diagnostic unit 132 are software functional units. However, it may be a hardware function part such as an LSI.

[0048] According to at least one of the embodiments described above, the diagnostic information generating unit 131 and the diagnostic unit By holding the fastening member 21 of the electric power equipment, loosening, improper tightening, etc. can be easily performed. Abnormalities can be diagnosed.

[0049] Although several embodiments of the present invention have been described, these embodiments are presented by way of example only. These embodiments are merely illustrative and are not intended to limit the scope of the invention. The present invention can be embodied in various forms, and various omissions, modifications, and alterations can be made without departing from the spirit and scope of the present invention. These embodiments and their modifications are within the scope and spirit of the invention. The inventions described in the claims and their equivalents are included in the scope of the invention as well as the inventions described in the claims and their equivalents. be. [Explanation of symbols]

[0050] 10, 11... conductor; 20, 22... conductor fastening portion; 21, 23... fastening member; 30... vibration means; 40, 41... vibration measuring device, 100... diagnostic device, 101... communication unit, 102... output unit, 103 ...control unit, 131...diagnosis information generating unit, 132...diagnosis unit

Claims

1. Each phase of a multi-phase AC supply to a load is a conductor and another conductor fastened by a specified fastening member. and a combination of the conductor and the fastening member, the vibration applied to the conductor is transmitted to the other conductor via the fastening member. Obtaining vibration information regarding the vibrations after they are transmitted to the body for a plurality of the combinations. an acquisition unit, the acquired vibration information for each phase being used to acquire a predetermined abnormality related to the fastening member; a diagnosis unit that diagnoses that the fastening member has an abnormality when a certain condition is satisfied, The condition is that the vibration information in any one of the plurality of combinations is The diagnostic device has a natural frequency of vibration different from vibration information in other combinations. Place.

2. The diagnostic device is a conductor in which each phase of a multi-phase AC current is supplied to a load and fastened by a predetermined fastening member. A combination of a body and another conductor, in which vibration applied to the conductor is transmitted through the fastening member. Vibration information regarding the vibration after being transmitted to the other conductor is and a diagnostic device for acquiring the vibration information of each phase based on the acquired vibration information of each phase. When a predetermined condition regarding an abnormality of the fastening member is satisfied, the fastening member is diagnosed as having an abnormality. and a diagnosis step of determining whether the predetermined condition is any one of the plurality of combinations. The vibration information in one combination is different from the vibration information in the other combinations. The diagnostic method includes:

3. Each phase of a multi-phase AC supply to a load is a conductor and another conductor fastened by a specified fastening member. and a combination of the conductor and the fastening member, the vibration applied to the conductor is transmitted to the other conductor via the fastening member. Vibration information regarding the vibrations after being transmitted to the body is obtained for a plurality of the combinations. an acquisition unit, wherein the acquired plurality of pieces of vibration information are used to determine a predetermined condition related to an abnormality of the fastening member; a diagnosis unit that diagnoses that there is an abnormality in the fastening member when the predetermined condition is satisfied, The condition is that the vibration information in any one of the plurality of combinations is different from the vibration information in any other combination. The diagnostic system has vibration information in combination with different vibration natural frequencies. Hmm.

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