Insulation Deterioration Diagnosis Device and Insulation Deterioration Diagnosis Method

Abstract

To diagnose automatically and more easily, a state of insulation deterioration in a rotary machine.SOLUTION: An insulation deterioration diagnostic device of the present invention comprises: an ozone concentration measuring instrument; and a diagnostic unit diagnosing insulation deterioration of a rotary machine, on the basis of the ozone concentration. The ozone concentration measuring instrument comprises: a first gas flow channel, for guiding a gas sucked from the rotary machine, to an ozone sensor, and returning the gas passed through the ozone sensor to the rotary machine; a second gas flow channel for returning the gas sucked from the rotary machine to the rotary machine without through the ozone sensor; and a switching mechanism switching a guiding direction of the gas between the first and second gas flow channels. The ozone sensor measures ozone concentration of the gas intermittently, and during a period in which measurement by the ozone sensor is not performed, the gas is guided to the second gas flow channel by the switching mechanism, and according to timing when the ozone sensor measures the ozone concentration, the gas is guided to the first gas flow channel by the switching mechanism.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an insulation degradation diagnostic device and an insulation degradation diagnostic method. [Background technology]

[0002] Rotating machines such as generators and electric motors installed in power plants and factories are composed of a cylindrical stator with multiple coils and a columnar rotor that rotates inside the hollow part of the stator. The coils on the stator are made of wire coils made of multiple bundles of insulating conductors, and the wire coils are fixed with an insulator such as mica tape. main The coil has an insulating layer and is housed in a slot of the stator core and wired. Since such a coil is subjected to electrical, thermal, and mechanical stress during operation of the rotating machine, the insulating layer of the coil is prone to deterioration over time. Since deterioration of the insulating layer over time can eventually lead to a breakdown (dielectric breakdown) of the rotating machine, various techniques have been proposed to diagnose the deterioration of the insulating layer over time in order to prevent such a breakdown from occurring.

[0003] It is known that ozone is generated when the insulating layer of a coil deteriorates over time and partial discharge (corona discharge) occurs. Therefore, various techniques have been proposed for diagnosing the degree of deterioration of the insulating layer in a rotating machine by measuring the concentration of ozone generated by partial discharge (corona discharge). For example, the following Patent Document 1 discloses a technique for determining the degree of deterioration of the insulating layer in a rotating machine by measuring the concentration of ozone and the concentration of nitrogen oxides generated in the rotating machine. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-139811 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the technology disclosed in the above Patent Document 1 requires an inspector to visit the rotating machine and use an ozone detection tube to suck out the gas inside the rotating machine, making it difficult to frequently determine the degree of deterioration of the insulation layer.

[0006] In addition, since ozone concentration varies depending on temperature and humidity, batch processing involving gas sampling by inspectors, as disclosed in the above-mentioned Patent Document 1, has large variations depending on the season and time of sampling, and there is a possibility that abnormalities in the rotating machine will be overlooked.

[0007] Therefore, the present invention has been made in consideration of the above problems, and an object of the present invention is to provide an insulation degradation diagnosis device and an insulation degradation diagnosis method that are capable of automatically and simply diagnosing the state of insulation degradation in a rotating machine. [Means for solving the problem]

[0008] In order to solve the above problems, firstly, it is necessary to realize a means for measuring the ozone concentration in a rotating machine at a desired timing without the intervention of an inspector. Based on this idea, the inventors of the present invention conducted research and came up with the idea of ​​using an ozone sensor capable of continuous measurement, instead of the ozone detection tube used in the above Patent Document 1.

[0009] Therefore, the inventors first conducted an experiment on an ozone sensor capable of continuous measurement, and found that when the ozone sensor is constantly exposed to ozone and continuous measurements of the ozone concentration are performed, a phenomenon occurs in which the measured ozone concentration gradually decreases, even though the sensor is exposed to a constant concentration of ozone.

[0010] In addition, currently available ozone sensors must perform measurements by removing the ozone gas, which is the measurement medium, from the rotating machine system. It has been found that continuous measurement of ozone concentration reduces the ozone concentration inside the rotating machine, thereby reducing the accuracy of the ozone concentration measurement.

[0011] As described above, it has become clear that the ozone concentration in a rotating machine cannot be accurately measured only by using an ozone sensor capable of continuous measurement, and therefore the inventors have conducted further studies to solve this problem. As a result, new knowledge has been obtained about the gas flow between the rotating machine and the ozone sensor, and about the measurement conditions of the ozone sensor, which has led to the completion of the present invention. The gist of the present invention, which has been completed based on the above findings, is as follows.

[0012] (1) An insulation deterioration diagnosis device for diagnosing insulation deterioration of a rotating machine based on an ozone concentration, comprising: an ozone concentration measuring device for measuring the ozone concentration; and a diagnosis unit for diagnosing insulation deterioration of the rotating machine based on the ozone concentration measured by the ozone concentration measuring device. The ozone concentration measuring device has a first gas flow path for guiding gas sucked from the rotating machine to an ozone sensor for measuring the ozone concentration and returning the gas that has passed through the ozone sensor to the rotating machine; and a switching mechanism that switches between the first gas flow path and the second gas flow path to which the gas is guided, wherein the ozone sensor intermittently measures the ozone concentration of the gas, and while the ozone sensor is not performing measurement, the gas is guided to the second gas flow path by the switching mechanism, and the gas is guided to the first gas flow path by the switching mechanism in synchronization with a timing at which the ozone sensor measures the ozone concentration. (2) The insulation degradation diagnosis device according to (1), wherein a flow rate of the gas supplied to the first gas flow path or the second gas flow path is 0.1 L / min or more. (3) The insulation deterioration diagnosis device according to (1) or (2), wherein the ozone sensor measures the ozone concentration of the gas at intervals of at least one minute. (4) The insulation degradation diagnosis device according to any one of (1) to (3), wherein the rotating machine is a rotating machine to which a voltage of 3.0 kV or more is applied. (5) The insulation deterioration diagnosis device according to any one of (1) to (4), wherein the ozone sensor is a constant potential electrolysis type ozone sensor. (6) The insulation degradation diagnosis device according to any one of (1) to (5), wherein the diagnosis unit diagnoses the degree of insulation degradation based on a concentration threshold value preset according to an installation environment of the rotating machine. (7) An insulation deterioration diagnosis method for diagnosing insulation deterioration of a rotating machine based on an ozone concentration, comprising: a first gas flow path that guides gas sucked from the rotating machine to an ozone sensor that measures the ozone concentration and returns the gas that has passed through the ozone sensor to the rotating machine; a second gas flow path that returns the gas sucked from the rotating machine to the rotating machine without passing through the ozone sensor; and a switching mechanism that switches between the first gas flow path and the second gas flow path to which the gas is guided, and the ozone sensor intermittently detects the ozone concentration of the gas. an ozone concentration measuring step of measuring the ozone concentration of the gas using an ozone concentration measuring device, in which the gas is guided to the second gas flow path by the switching mechanism while the ozone sensor is not performing measurement of the ozone concentration, and the gas is guided to the first gas flow path by the switching mechanism in accordance with a timing at which the ozone sensor measures the ozone concentration; and a diagnosis step of diagnosing insulation deterioration of the rotating machine based on the ozone concentration measured by the ozone concentration measuring device. Effect of the Invention

[0013] As described above, according to the present invention, it is possible to automatically and more simply diagnose the state of insulation deterioration in a rotating machine. [Brief description of the drawings]

[0014] [Figure 1A] FIG. 1 is an explanatory diagram illustrating a schematic example of a structure of a rotating machine on which the present invention focuses. [Figure 1B] FIG. 1 is an explanatory diagram illustrating a schematic example of a structure of a rotating machine on which the present invention focuses. [Diagram 2]1 is an explanatory diagram illustrating a schematic example of a configuration of an insulation deterioration diagnosis device according to an embodiment of the present invention; [Diagram 3] 2 is an explanatory diagram showing a schematic example of the configuration of an ozone concentration measuring device included in the insulation deterioration diagnosis device according to the embodiment; FIG. [Figure 4] FIG. 2 is an explanatory diagram for explaining an ozone concentration measuring device according to the embodiment. [Diagram 5] 2 is a block diagram showing an example of the configuration of a calculation processing device included in the insulation deterioration diagnosis device according to the embodiment. FIG. [Figure 6] 2 is a block diagram showing an example of a configuration of a processing unit included in the processing device according to the embodiment. FIG. [Figure 7] 10 is an explanatory diagram for explaining a diagnostic process in the arithmetic processing device according to the embodiment; FIG. [Figure 8] FIG. 2 is a block diagram showing an example of a hardware configuration of a processing device according to the embodiment. [Figure 9] FIG. 2 is a graph showing the measurement results of ozone concentration in the examples. [Figure 10] 1 is a graph showing the results of continuous measurement of a constant ozone concentration using a conventional constant potential electrolysis measuring device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this specification and the drawings, components having substantially the same functional configurations are designated by the same reference numerals, and duplicated explanations will be omitted.

[0016] (About rotating machines) 1A is a schematic diagram showing the cross-sectional structure of a rotating machine 1, such as a generator or electric motor installed in a power plant or factory. The rotating machine 1 has a stator 2 having a cylindrical hollow portion, and a rotor 3 arranged so as to be rotatable in the hollow portion 3 of the stator 2. A plurality of stator slots 5 are provided in a stator core 4 of the stator 2 so as to surround the rotor 3.

[0017] 1B is an enlarged schematic diagram showing the configuration of one stator slot 5. As shown in FIG. 1B, in the stator slot 5, a stator winding 7 is provided in the space of the stator core 4 blocked by a wedge 6, and the periphery of the stator winding 7 is covered with a main insulating layer 8 made of an insulating material such as mica fixed with a resin. In addition, a corona prevention layer 9 for preventing partial discharge (corona discharge) is provided around the main insulating layer 8.

[0018] In the stator slots 5, the air gap in the main insulating layer 8 is minimized to prevent the occurrence of partial discharges (corona discharges). However, aging of the main insulating layer 8 and the corona prevention layer 9 may cause voids to form, which may lead to harmful partial discharges and may progress to insulation breakdown.

[0019] It is known that ozone is generated when the partial discharge occurs as described above. Therefore, by focusing on the ozone concentration inside the rotating machine, it is possible to diagnose the degree of partial discharge occurrence, and therefore the degree of deterioration of the main insulating layer 8 and the corona prevention layer 9.

[0020] (Overall configuration of insulation deterioration diagnosis device) Fig. 2 is an explanatory diagram showing a schematic overall configuration of an insulation degradation diagnosis device according to an embodiment of the present invention. The insulation degradation diagnosis device 10 according to this embodiment is a device that diagnoses the degree of degradation of an insulation layer in the rotating machine 1 as described above. As shown in Fig. 2, this insulation degradation diagnosis device 10 has an ozone concentration measuring device 100 and an arithmetic processing device 200.

[0021] Under the control of the arithmetic processing device 200, the ozone concentration measuring device 100 sucks gas from the rotating machine 1, measures the concentration of ozone contained in the sucked gas, and returns the gas sucked from the rotating machine 1 to the rotating machine 1. This makes it possible to prevent the ozone concentration in the rotating machine 1 from decreasing as the ozone concentration is measured, and makes it possible to measure the ozone concentration in the rotating machine 1 with high accuracy. The detailed configuration of the ozone concentration measuring device 100 will be described later.

[0022] The arithmetic processing device 200 comprehensively controls the ozone concentration measurement operation by the ozone concentration measuring device 100. The arithmetic processing device 200 also diagnoses the degree of deterioration of the insulating layer in the rotating machine 1 of interest, using the measurement results of the ozone concentration by the ozone concentration measuring device 100. The arithmetic processing device 200 can also obtain data (i.e., the measurement results of temperature and humidity) from a thermometer or hygrometer that measures the temperature and humidity of the environment in which the rotating machine 1 is installed, and use the data to diagnose the degree of deterioration of the insulating layer. The data from the ozone concentration measuring device 100, the thermometer, and the hygrometer may be obtained by wireless communication between the devices, or by wired communication between the devices.

[0023] The arithmetic processing device 200 may be an information processing device such as various personal computers or servers, or may be a process computer that controls the operating state of the rotating machine 1 of interest.

[0024] The detailed configuration of the arithmetic processing device 200 will be described later.

[0025] The rotating machine 1 that the insulation degradation diagnosis device 10 according to the present embodiment focuses on is not particularly limited, and the device is capable of diagnosing the degree of degradation of the insulation layer of various rotating machines 1. However, the insulation degradation diagnosis device 10 according to the present embodiment is particularly effective when diagnosing the degree of degradation of the insulation layer of so-called high-voltage rotating machines and extra-high-voltage rotating machines, such as rotating machines to which a voltage of 3.0 kV or more is applied. While high voltage is applied to such rotating machines, the size of the equipment is often reduced, and ozone is easily generated when the insulation layer deteriorates.

[0026] (About ozone concentration measuring instruments) Next, the configuration of the ozone concentration measuring device 100 included in the insulation deterioration diagnosis device 10 according to the present embodiment will be described in detail with reference to Figures 3 and 4. Figure 3 is an explanatory diagram that shows a schematic example of the configuration of the ozone concentration measuring device included in the insulation deterioration diagnosis device according to the present embodiment, and Figure 4 is an explanatory diagram for explaining the ozone concentration measuring device according to the present embodiment.

[0027] As shown diagrammatically in FIG. 3, the ozone concentration measuring device 100 of this embodiment has a gas suction passage 101, which serves as a passage for gas suctioned from inside the rotating machine by a pump or the like (not shown), and a first gas passage 105 that guides gas suctioned from the rotating machine to an ozone sensor 103 that measures the ozone concentration, and returns gas that has passed through the ozone sensor 103 to the rotating machine, a second gas passage 107 that returns the gas suctioned from the rotating machine to the rotating machine without passing through the ozone sensor 103, and a switching mechanism 109 that switches between the first gas passage 105 and the second gas passage 107 to which passage the gas suctioned from the rotating machine is to be guided.

[0028] Here, the gas suction flow path 101 is not particularly limited, and various flow paths can be used as long as they are capable of supplying gas from the rotating machine to the ozone concentration measuring device 100. In addition, the gas suction flow path 101 may be provided with various mechanisms, such as a pump (not shown) for suctioning gas from the rotating machine, and various filter mechanisms for removing dust and the like present in the gas.

[0029] The ozone sensor 103 is a sensor that measures the concentration of ozone contained in the gas supplied to the ozone sensor. The ozone sensor 103 used is one that can continuously measure the ozone concentration of the gas supplied. There are no particular limitations on the ozone sensor 103 as long as it is capable of continuous measurement. However, by using an ozone sensor of a constant potential electrolysis type, it is possible to realize continuous measurement and to measure even a trace amount of ozone with high accuracy. For this reason, it is preferable to use an ozone sensor of a constant potential electrolysis type as the ozone sensor 103.

[0030] The ozone sensor 103 according to this embodiment measures the concentration of ozone contained in the gas supplied to the ozone sensor 103 under the control of the arithmetic processing device 200. Here, as shown in FIG. 4, the ozone concentration measuring device 100 according to this embodiment uses an ozone sensor capable of continuous measurement, but performs intermittent measurement of the ozone concentration based on a control signal output from the arithmetic processing device 200. By performing intermittent measurement in cooperation with the downstream switching mechanism 109, it is possible to prevent the ozone sensor 103 from being continuously exposed to ozone, and to prevent the occurrence of a phenomenon in which the measured value of the ozone concentration gradually decreases. As a result, the ozone concentration measuring device 100 according to this embodiment can measure the ozone concentration with high accuracy.

[0031] Here, the ozone sensor 103 preferably measures the ozone concentration of the gas to be supplied at intervals of at least one minute or more. In other words, the measurement interval Δt, which is shown in FIG. 4 as a schematic diagram, is preferably one minute or more. By performing measurements intermittently at such intervals, it is possible to more reliably achieve a more accurate measurement of the ozone concentration and to maintain the life of the ozone sensor 103 as a device. The specific length of the measurement interval Δt is not particularly limited as long as it is one minute or more, and may be appropriately set depending on the characteristics of the ozone sensor 103 used, the installation environment of the rotating machine of interest, the number of years of use, and the like. In addition, the longer the measurement interval Δt, the more the ozone sensor 103 is prevented from being exposed to ozone, which acts in a favorable direction for maintaining the life of the ozone sensor 103, so that the upper limit of the measurement interval Δt is not particularly specified.

[0032] In addition, the measurement time for one measurement by the ozone sensor 103 (the time indicated by T in FIG. 4) is not particularly specified, and it is sufficient to ensure the time until the gas at the flow rate supplied to the ozone sensor 103 passes through the ozone sensor 103.

[0033] The measurement result of the ozone concentration measured by the ozone sensor 103 is output to the arithmetic processing device 200. At this time, data communication between the ozone sensor 103 and the arithmetic processing device 200 may be realized by wired communication or wireless communication.

[0034] The first gas flow path 105 in the ozone concentration measuring instrument 100 is a flow path that guides the gas sucked from the rotating machine via the gas suction flow path 101 to the ozone sensor 103, and returns the gas that has passed through the ozone sensor 103 to the rotating machine. The second gas flow path 107 in the ozone concentration measuring instrument 100 is a flow path that returns the gas sucked from the rotating machine via the gas suction flow path 101 to the rotating machine without passing through the ozone sensor 103. A switching mechanism 109 controls which of these two flow paths the gas is guided to.

[0035] 3, the downstream ends of the first gas flow passage 105 and the second gas flow passage 107 are connected to the rotating machine into which the gas is sucked. As a result, the gas drawn out from the rotating machine finally returns to the rotating machine, so that it is possible to prevent the ozone concentration in the rotating machine from decreasing every time the ozone concentration is measured, and it is possible to measure the correct ozone concentration in the rotating machine.

[0036] Moreover, the flow rate of the gas supplied to the first gas flow passage 105 and the second gas flow passage 107 is preferably 0.1 L / min or more. By setting such a flow rate, it is possible to measure the ozone concentration in the rotating machine with higher accuracy. Furthermore, by setting the flow rates of the gas flowing through the first gas flow passage 105 and the second gas flow passage 107 to the same value, it is possible to suppress fluctuations in the ozone concentration due to reasons other than the increase in ozone caused by the deterioration of the insulating layer, and it is possible to further improve the measurement accuracy of the ozone concentration. The flow rate of the gas flowing through the first gas flow passage 105 and the second gas flow passage 107 is more preferably 0.5 L / min or more. On the other hand, the upper limit value of the flow rate of the gas flowing through the first gas flow passage 105 and the second gas flow passage 107 is not particularly specified, and may be appropriately set according to the characteristics of the ozone sensor 103, etc.

[0037] The specific materials of the first gas flow path 105 and the second gas flow path 107 and the detailed layout of the flow paths are not particularly limited and may be appropriately set depending on the installation environment of the ozone concentration measuring device 100. The first gas flow path 105 and the second gas flow path 107 may be provided with various mechanisms such as various filters, various valve mechanisms, a flow meter, a pressure gauge, and a backflow prevention mechanism (not shown).

[0038] The switching mechanism 109, under the control of the arithmetic processing device 200, switches whether the gas sucked from the rotating machine via the gas suction passage 101 is guided to the first gas passage 105 or the second gas passage 107. This makes it possible to switch whether or not the gas that may contain ozone is supplied to the ozone sensor 103, thereby enabling intermittent measurement in the ozone sensor 103.

[0039] More specifically, in the ozone concentration measuring instrument 100, while the ozone sensor 103 is not performing a measurement, the gas supplied from the gas suction passage 101 is guided to the second gas passage 107 by the switching mechanism 109. As a result, the gas sucked from the rotating machine is returned to the rotating machine without passing through the ozone sensor 103. Also, in accordance with the timing at which the ozone sensor 103 measures the ozone concentration, the gas supplied from the gas suction passage 101 is guided to the first gas passage 105 by the switching mechanism 109. As a result, the gas sucked from the rotating machine is returned to the rotating machine after passing through the ozone sensor 103. During this process, the ozone concentration of the gas sucked from the rotating machine is measured by the ozone sensor 103.

[0040] The specific configuration of the switching mechanism 109 that realizes such switching processing is not particularly limited, and various known valves and the like can be used as appropriate.

[0041] The ozone concentration measuring instrument 100 according to this embodiment has been described in detail above with reference to FIGS.

[0042] (Regarding the processing unit) Next, the configuration of the arithmetic processing device 200 included in the insulation degradation diagnosis device 10 according to the present embodiment will be described in detail with reference to Figs. 5 to 7. Fig. 5 is a block diagram showing an example of the configuration of the arithmetic processing device included in the insulation degradation diagnosis device according to the present embodiment. Fig. 6 is a block diagram showing an example of the configuration of a calculation processing unit included in the arithmetic processing device according to the present embodiment. Fig. 7 is an explanatory diagram for explaining the diagnosis process in the arithmetic processing device according to the present embodiment.

[0043] The arithmetic processing device 200 according to this embodiment includes a measurement control section 201, an arithmetic processing section 203, a result output section 205, a display control section 207, and a storage section 209, as shown in FIG.

[0044] The measurement control unit 201 is realized by, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an input device, a communication device, etc. The measurement control unit 201 comprehensively controls the operating state of the ozone concentration measuring device 100 included in the insulation degradation diagnosis device 10 according to this embodiment.

[0045] This allows the measurement control unit 201 to control the measurement start timing and measurement end timing of the ozone sensor 103 in the ozone concentration measuring instrument 100, and to control the switching timing between the first gas flow path 105 and the second gas flow path 107 in the switching mechanism 109. This allows the insulation degradation diagnosis device 10 according to this embodiment to automatically and more simply measure the ozone concentration using the ozone concentration measuring instrument 100.

[0046] The arithmetic processing unit 203 is realized by, for example, a CPU, a ROM, a RAM, etc. The arithmetic processing unit 203 has a diagnostic function for diagnosing insulation deterioration of a rotating machine of interest based on the ozone concentration in the rotating machine of interest measured by the ozone concentration measuring device 100.

[0047] Moreover, it is preferable that the calculation processing unit 203 has a concentration correction function for correcting the ozone concentration measured by the ozone concentration measuring device 100, using the measurement results of the temperature and humidity of the environment in which the rotating machine of interest is installed. By further having such a concentration correction function, the calculation processing unit 203 can correct the ozone concentration prior to performing the diagnosis function, and it becomes possible to more accurately diagnose the degree of deterioration of the insulating layer of the rotating machine of interest.

[0048] The detailed configuration of the arithmetic processing unit 203 will be described later.

[0049] The result output unit 205 is realized by, for example, a CPU, a ROM, a RAM, an output device, a communication device, etc. The result output unit 205 outputs the diagnosis result on the deterioration degree of the insulating layer of the rotating machine of interest output from the arithmetic processing unit 203 to a user. Specifically, the result output unit 205 outputs data on the diagnosis result on the deterioration degree of the insulating layer output from the arithmetic processing unit 203 to various servers, control devices, etc., or outputs it as a paper medium using an output device such as a printer, in association with time data on the date and time when the data was generated. In addition, the result output unit 205 may output data on the diagnosis result to various information processing devices such as a computer provided externally, or various recording media.

[0050] Furthermore, the result output unit 205 can output data relating to the diagnosis result by the arithmetic processing unit 203 to the display control unit 207 described later.

[0051] Furthermore, the result output unit 205 may output the measurement result itself relating to the ozone concentration output from the arithmetic processing unit 203 to the user in the same manner as described above.

[0052] The display control unit 207 is realized by, for example, a CPU, a ROM, a RAM, an output device, a communication device, etc. The display control unit 207 performs display control when displaying the diagnosis result of the deterioration degree of the insulating layer and the measurement result of the ozone concentration output from the result output unit 205 on an output device such as a display provided in the arithmetic processing device 200 or an output device provided outside the arithmetic processing device 200. This enables the user to immediately grasp the deterioration degree of the insulating layer in the rotating machine of interest and knowledge regarding the ozone concentration.

[0053] The memory unit 209 is an example of a storage device included in the arithmetic processing device 200, and is realized by, for example, a ROM, a RAM, a storage device, etc. In this memory unit 209, various parameters and intermediate results of processing (for example, various data, databases, and programs stored in advance) that need to be saved when the insulation degradation diagnosis device 10 according to this embodiment performs some processing are appropriately recorded. In this memory unit 209, the measurement control unit 201, the arithmetic processing unit 203, the result output unit 205, the display control unit 207, etc. can freely perform data read / write processing.

[0054] <Configuration of the computation processing unit> Next, a detailed configuration of the arithmetic processing unit 203 included in the arithmetic processing device 200 will be described with reference to Fig. 6. Note that Fig. 6 illustrates an example of a configuration in which the arithmetic processing unit 203 according to this embodiment has not only the diagnostic function mentioned above but also a concentration correction function.

[0055] The arithmetic processing unit 203 according to this embodiment includes a data acquisition unit 211, a concentration correction unit 213, and a diagnosis unit 215, as shown in FIG.

[0056] The data acquisition unit 211 is realized by, for example, a CPU, a ROM, a RAM, an input device, a communication device, etc. The data acquisition unit 211 acquires measurement data related to the ozone concentration in the rotating machine of interest, and measurement data related to the temperature and humidity, which are measured by the ozone concentration measuring instrument 100. The data acquisition unit 211 outputs the acquired measurement data to the concentration correction unit 213 in the subsequent stage. The data acquisition unit 211 may also store the measurement data in the storage unit 209 as history information after associating the measurement data with time data related to the date and time when the measurement data was acquired.

[0057] The concentration correction unit 213 is realized by, for example, a CPU, a ROM, a RAM, etc. The concentration correction unit 213 corrects the ozone concentration measured by the ozone concentration measuring instrument 100 using the measurement data related to the temperature and humidity output from the data acquisition unit 211.

[0058] It is known that the generated ozone gradually decomposes, and that the decomposition speed of ozone depends on (has a negative correlation with) temperature and absolute humidity. Therefore, by correcting the ozone concentration measured by the ozone concentration measuring device 100 based on such correlation, it becomes possible to more accurately specify the ozone concentration in the rotating machine. As a result, by using the more accurate ozone concentration, it becomes possible to more accurately diagnose the degree of deterioration of the insulating layer of the rotating machine.

[0059] The details of the above-mentioned density correction method are not particularly limited, but for example, it is possible to use a density correction process such as that disclosed in JP 2020-61797 A.

[0060] When the concentration correction unit 213 performs the concentration correction process by, for example, the method described above, it outputs data on the corrected ozone concentration to the downstream diagnosis unit 215. In addition, the concentration correction unit 213 may store the corrected data on the ozone concentration in the storage unit 209 as history information after associating the data with time data on the date and time when the data was generated.

[0061] The diagnosis unit 215 is realized by, for example, a CPU, a ROM, a RAM, etc. The diagnosis unit 215 diagnoses the degree of deterioration of the insulating layer of the rotating machine of interest based on the ozone concentration measured by the ozone concentration measuring device 100 (in the case of FIG. 6, the ozone concentration measured by the ozone concentration measuring device 100 and corrected by the concentration correcting unit 213).

[0062] The more the deterioration of the main insulating layer and the corona prevention layer of the rotating machine progresses, the higher the ozone concentration in the rotating machine becomes. Therefore, it is preferable that the diagnosis unit 215 diagnoses the deterioration degree of the insulating layer based on a concentration threshold value (e.g., a past measurement result of ozone concentration, a specific verification result of the deterioration degree of the insulating layer, etc.) that is preset according to the installation environment of the rotating machine of interest.

[0063] For example, the diagnostic unit 215 may perform a binary threshold judgment, such as diagnosing the ozone concentration as "not degraded" if the obtained ozone concentration is below a preset concentration threshold, and diagnosing the ozone concentration as "degraded" if the obtained ozone concentration is equal to or greater than the preset concentration threshold.

[0064] In addition, the diagnosis unit 215 may perform multi-stage threshold judgment, for example as shown in FIG. 7, by setting two concentration thresholds in advance, namely, a concentration threshold TH1 and a concentration threshold TH2 (>TH1), and diagnosing the obtained ozone concentration as "normal" if it is less than the concentration threshold TH1, diagnosing the ozone concentration as "inspection required" if it is equal to or greater than TH1 and less than TH2, and diagnosing the ozone concentration as "update required" if it is equal to or greater than TH2.

[0065] When the diagnosis unit 215 performs a diagnosis based on the obtained ozone concentration, for example, as described above, it outputs data on the obtained diagnosis result to the result output unit 205. Furthermore, the diagnosis unit 215 may store the data on the obtained diagnosis result in the storage unit 209 as history information after associating the data with time data on the date and time when the data was generated.

[0066] The arithmetic processing device 200 according to this embodiment has been described in detail above with reference to FIGS.

[0067] An example of the functions of the arithmetic processing device 200 according to this embodiment has been described above. Each of the above components may be configured using general-purpose members and circuits, or may be configured using hardware specialized for the function of each component. In addition, the functions of each component may all be performed by a CPU or the like. Therefore, it is possible to change the configuration to be used as appropriate depending on the technical level at the time of implementing this embodiment.

[0068] It is possible to create a computer program for implementing each function of the arithmetic processing device according to the present embodiment as described above, and to install it in a personal computer or the like. It is also possible to provide a computer-readable recording medium in which such a computer program is stored. The recording medium is, for example, a magnetic disk, an optical disk, a magneto-optical disk, a flash memory, or the like. The computer program may also be distributed, for example, via a network, without using a recording medium.

[0069] (Hardware configuration of the arithmetic processing unit) Next, a hardware configuration of the arithmetic processing device 200 according to the embodiment of the present invention will be described in detail with reference to Fig. 8. Fig. 8 is a block diagram for explaining the hardware configuration of the arithmetic processing device 200 according to the embodiment of the present invention.

[0070] The arithmetic processing device 200 mainly includes a CPU 901, a ROM 903, and a RAM 905. The arithmetic processing device 200 further includes a bus 907, an input device 909, an output device 911, a storage device 913, a drive 915, a connection port 917, and a communication device 919.

[0071] The CPU 901 functions as a central processing device and control device, and controls all or part of the operations within the arithmetic processing device 200 in accordance with various programs recorded in the ROM 903, the RAM 905, the storage device 913, or the removable recording medium 921. The ROM 903 stores programs and arithmetic parameters used by the CPU 901. The RAM 905 temporarily stores programs used by the CPU 901 and parameters that change appropriately during program execution. These are connected to each other by a bus 907 constituted by an internal bus such as a CPU bus.

[0072] The bus 907 is connected to an external bus such as a PCI (Peripheral Component Interconnect / Interface) bus via a bridge.

[0073] The input device 909 is an operation means operated by a user, such as a mouse, a keyboard, a touch panel, a button, a switch, and a lever. The input device 909 may be, for example, a remote control means (so-called a remote control) using infrared rays or other radio waves, or an external connection device 923 such as a PDA that supports the operation of the arithmetic processing device 200. The input device 909 is further composed of, for example, an input control circuit that generates an input signal based on information input by a user using the above-mentioned operation means and outputs the signal to the CPU 901. The user can input various data to the arithmetic processing device 200 and instruct the arithmetic processing device 200 to perform processing operations by operating the input device 909.

[0074] The output device 911 is configured with a device capable of visually or audibly notifying the user of acquired information. Such devices include display devices such as CRT display devices, liquid crystal display devices, plasma display devices, EL display devices, and lamps, audio output devices such as speakers and headphones, printer devices, mobile phones, facsimiles, and the like. The output device 911 outputs, for example, results obtained by various processes performed by the arithmetic processing device 200. Specifically, the display device displays the results obtained by various processes performed by the arithmetic processing device 200 in the form of text or images. On the other hand, the audio output device converts audio signals consisting of reproduced voice data, acoustic data, and the like into analog signals and outputs them.

[0075] The storage device 913 is a data storage device configured as an example of a storage unit of the arithmetic processing device 200. The storage device 913 is configured, for example, with a magnetic storage device such as a hard disk drive (HDD), a semiconductor storage device, an optical storage device, or a magneto-optical storage device. This storage device 913 stores programs and various data executed by the CPU 901, and various data acquired from the outside.

[0076] The drive 915 is a reader / writer for a recording medium, and is built in or externally attached to the arithmetic processing device 200. The drive 915 reads out information recorded in a removable recording medium 921, such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory, and outputs the information to the RAM 905. The drive 915 can also write information to the removable recording medium 921, such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory, that is mounted on the drive 915. The removable recording medium 921 is, for example, a CD medium, a DVD medium, a Blu-ray (registered trademark) medium, or the like. The removable recording medium 921 may also be a CompactFlash (registered trademark) (CF), a flash memory, or a Secure Digital memory card (SD memory card), or the like. The removable recording medium 921 may also be, for example, an IC card (Integrated Circuit card) equipped with a non-contact IC chip, or an electronic device, or the like.

[0077] The connection port 917 is a port for directly connecting a device to the arithmetic processing device 200. Examples of the connection port 917 include a Universal Serial Bus (USB) port, an IEEE1394 port, a Small Computer System Interface (SCSI) port, an RS-232C port, and a High-Definition Multimedia Interface (HDMI) port (registered trademark). By connecting an external device 923 to this connection port 917, the arithmetic processing device 200 can directly obtain various data from the external device 923 and provide various data to the external device 923.

[0078] The communication device 919 is, for example, a communication interface configured with a communication device for connecting to a communication network 925. The communication device 919 is, for example, a communication card for a wired or wireless LAN (Local Area Network), Bluetooth (registered trademark), or WUSB (Wireless USB). The communication device 919 may also be a router for optical communication, a router for ADSL (Asymmetric Digital Subscriber Line), or a modem for various communications. For example, the communication device 919 can transmit and receive signals in accordance with a predetermined protocol such as TCP / IP between the Internet and other communication devices. The communication network 925 connected to the communication device 919 is configured with a network connected by wire or wirelessly, and may be, for example, the Internet, a home LAN, an in-house LAN, infrared communication, radio wave communication, or satellite communication.

[0079] An example of a hardware configuration capable of realizing the functions of the arithmetic processing device 200 according to the embodiment of the present invention has been described above. Each of the above components may be configured using general-purpose components, or may be configured using hardware specialized for the function of each component. Therefore, the hardware configuration to be used can be changed as appropriate depending on the technical level at the time of implementing this embodiment. EXAMPLES

[0080] The insulation deterioration diagnostic device and insulation deterioration diagnostic method according to the present invention will be specifically described below while showing examples and comparative examples. Note that the examples shown below are merely examples of the insulation deterioration diagnostic device and insulation deterioration diagnostic method according to the present invention, and the insulation deterioration diagnostic device and insulation deterioration diagnostic method according to the present invention are not limited to the following examples.

[0081] First, to confirm the ozone sensor used, a constant potential electrolysis ozone sensor (PS-2DPW manufactured by New Cosmos Electric Co., Ltd.) capable of continuous measurement was used to continuously measure the ozone concentration in an atmosphere where the ozone concentration was constant (1 ppm). As a result, the measured value, which should have been almost constant, gradually decreased. That is, as shown in part of the measurement results in FIG. 10, the measured ozone concentration should have been almost constant at 1 ppm during the measurement time of 23 to 26 minutes during which the ozone sensor was exposed to ozone, but in reality, the measured value gradually decreased. From these results, it was confirmed once again that the ozone concentration of a rotating machine cannot be accurately measured by simply operating the constant potential electrolysis ozone sensor used continuously.

[0082] Next, an ozone concentration measuring device having the configuration shown in Figure 3 was fabricated using the same constant potential electrolysis ozone sensor (PS-2DPW manufactured by New Cosmos Electric Co., Ltd.) as above. The fabricated ozone concentration measuring device was installed in a rotating machine to which a voltage of 3.0 kV or more was applied. In addition, a commercially available hygrometer and thermometer were also installed in the rotating machine, so that the absolute humidity and temperature inside the rotating machine could be measured.

[0083] Using this ozone concentration measuring device, the measurement interval Δt was set to 1 minute, and the ozone concentration generated from the rotating machine was measured for about 6 hours. The flow rate of the gas introduced from the rotating machine to the ozone concentration measuring device was set to 0.1 L / min. In addition, the ozone concentration measured by the ozone concentration measuring device was corrected by the concentration correction process disclosed in JP 2020-61797 A using the measured values ​​(absolute humidity and temperature) obtained from the hygrometer and thermometer.

[0084] The obtained measurement results are shown in FIG. 9. The horizontal axis of FIG. 9 indicates the measurement time, and the vertical axis indicates the ozone concentration, the relative humidity, and the temperature. As is clear from FIG. 9, it is possible to continuously measure the concentration of ozone generated by the target rotating machine at a short measurement interval of one minute. It is also possible to visually grasp the change in ozone concentration depending on temperature and humidity. This makes it clear that by performing continuous measurement for a long period of time in combination with a calculation processing device having the configuration shown in FIG. 5 and FIG. 6, it is possible to perform a highly accurate diagnosis without overlooking the maximum value of the ozone concentration.

[0085] In addition, when the calibration gas with an ozone concentration of 1 ppm was measured using the ozone concentration meter, the ozone concentration obtained was 1.05 ppm. When the ozone concentration of the same calibration gas was measured using an ozone detector tube, the result was 1.0 ppm. From these results, it became clear that the ozone concentration meter we made can measure ozone concentration with almost the same accuracy as an ozone detector tube (higher accuracy than an ozone detector tube, considering the number of significant digits).

[0086] Although the preferred embodiment of the present invention has been described in detail above with reference to the accompanying drawings, the present invention is not limited to such an example. It is clear that a person having ordinary knowledge in the technical field to which the present invention pertains can conceive of various modified or altered examples within the scope of the technical ideas described in the claims, and it is understood that these also naturally belong to the technical scope of the present invention. [Explanation of symbols]

[0087] 1 Rotating Machine 10. Insulation Deterioration Diagnostic Device 100 Ozone concentration meter 101 Gas suction channel 103 Ozone Sensor 105 First gas flow path 107 Second gas flow path 109 Switching Mechanism 200 Processing unit 201 Measurement control section 203 Processing unit 205 Result output section 207 Display control section 209 Memory section 211 Data Acquisition Department 213 Density correction section 215 Diagnostics Department

Claims

1. An insulation deterioration diagnosis device for diagnosing insulation deterioration of a rotating machine based on an ozone concentration, comprising: an ozone concentration meter for measuring the ozone concentration; a diagnosis unit that diagnoses insulation deterioration of the rotating machine based on the ozone concentration measured by the ozone concentration measuring device; Equipped with The ozone concentration measuring device is a first gas flow path that guides the gas sucked from the rotary machine to an ozone sensor that measures the ozone concentration, and returns the gas that has passed through the ozone sensor to the rotary machine; a second gas flow passage that returns the gas sucked from the rotary machine to the rotary machine without passing through the ozone sensor; a switching mechanism that switches between the first gas flow path and the second gas flow path to guide the gas; It has the ozone sensor intermittently measures the ozone concentration of the gas; while the ozone sensor is not performing a measurement, the gas is guided to the second gas flow path by the switching mechanism, and in accordance with a timing at which the ozone sensor measures the ozone concentration, the gas is guided to the first gas flow path by the switching mechanism.

2. 2 . The insulation deterioration diagnosis device according to claim 1 , wherein a flow rate of the gas supplied to the first gas flow passage or the second gas flow passage is 0.1 L / min or more.

3. 3. The insulation deterioration diagnosis device according to claim 1, wherein the ozone sensor measures the ozone concentration of the gas at intervals of at least one minute.

4. 4. The insulation deterioration diagnosis device according to claim 1, wherein the rotating machine is a rotating machine to which a voltage of 3.0 kV or more is applied.

5. 5. The insulation deterioration diagnosis device according to claim 1, wherein the ozone sensor is a constant potential electrolysis type ozone sensor.

6. 6. The insulation deterioration diagnosis device according to claim 1, wherein the diagnosis unit diagnoses the degree of insulation deterioration based on a concentration threshold value that is preset according to an installation environment of the rotating machine.

7. 1. An insulation deterioration diagnosis method for diagnosing insulation deterioration of a rotating machine based on an ozone concentration, comprising: an ozone concentration measuring step of measuring the ozone concentration of the gas using an ozone concentration measuring device, the ozone concentration measuring device having a first gas flow path that guides the gas sucked from the rotary machine to an ozone sensor that measures an ozone concentration of the gas and returns the gas that has passed through the ozone sensor to the rotary machine; a second gas flow path that returns the gas sucked from the rotary machine to the rotary machine without passing through the ozone sensor; and a switching mechanism that switches whether the gas is guided to the first gas flow path or the second gas flow path, the ozone sensor intermittently measures the ozone concentration of the gas, the gas is guided to the second gas flow path by the switching mechanism while measurement by the ozone sensor is not being performed, and the gas is guided to the first gas flow path by the switching mechanism in accordance with a timing at which the ozone sensor measures the ozone concentration; a diagnosis step of diagnosing insulation deterioration of the rotating machine based on the ozone concentration measured by the ozone concentration measuring device; The insulation deterioration diagnosis method includes the steps of:

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