Maintenance device

Abstract

To provide a maintenance device capable of accurately removing foreign matter on an electrode by an arc in which an appropriate generation state is secured.SOLUTION: The maintenance device (30) includes a control unit (10) that controls a removal process of generating an arc between a pair of separable electrodes (41) and removing foreign matter on the electrodes (41) by the arc. The control unit (10) records and includes time-series information (T) indicating a period length between a first time point and a second time point later than the first time point and environmental information (C) continuously indicating an environmental state of the electrode (41) between the first time point and the second time point, and derives a processing condition for determining an arc generation state by the removal processing at the second time point based on the time-series information (T) and the environmental information (C).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a maintenance device. [Background technology]

[0002] For example, in switches such as MCCBs (Molded Case Circuit Breakers) and electromagnetic relays that open and close electrical circuits in switchboards installed in factories, the electrodes are generally made of silver alloy, and insulating films such as natural sulfide films are formed over time. In order to prevent an increase in the contact resistance of the switch contacts due to such insulating films, the following methods for removing oxide films from DC-driven electromagnetic relays have been disclosed.

[0003] That is, a conventional method for removing oxide films from a DC-driven electromagnetic relay using a maintenance device involves applying a DC voltage across the contact circuit of the DC-driven electromagnetic relay, applying an AC excitation voltage to the excitation coil of the DC-driven electromagnetic relay, thereby intermittently opening and closing the fixed contact and the movable contact, generating an arc between the fixed contact and the movable contact, and then, a certain time after the excitation voltage is applied to the excitation coil, reversing the polarity of the applied DC voltage to generate an arc between the fixed contact and the movable contact, and the generation of the arc removes the oxide films on the surfaces of the fixed contact and the movable contact (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-163968 Summary of the Invention [Problem to be solved by the invention]

[0005] In the above-mentioned conventional method for removing oxide film from a DC-driven electromagnetic relay using a maintenance device, before the switch is put into operation, an excitation voltage is applied to the excitation coil, and then the polarity of the applied DC voltage is reversed a certain time later, thereby generating an arc in both directions between the pair of electrodes, the fixed contact and the movable contact, thereby reducing unevenness in the removal of the oxide film.

[0006] However, although the contact resistance of the electrodes of a switch is controlled to an appropriate value at the time of shipment from the manufacturer, the time required between shipment and the start of operation of the switch due to transportation, installation, etc., causes the formation of foreign matter such as natural oxide films on the electrodes, which is expected to increase the contact resistance. The degree of increase in contact resistance due to such foreign matter formed over time, such as natural oxide films, varies from switch to switch. Therefore, the conventional oxide film removal method described above cannot generate an arc of appropriate size in the oxide film removal process for each individual switch. For example, if the arc is small, the oxide film is not sufficiently removed, or if the arc is too large, the electrodes are deteriorated.

[0007] The present disclosure discloses a technique for solving the above-mentioned problems, and aims to provide a maintenance device that accurately removes foreign matter on an electrode using an arc that is generated in an appropriate state, and that suppresses electrode deterioration. [Means for solving the problem]

[0008] The maintenance device of the present disclosure comprises: A maintenance device including a control unit that generates an arc between a pair of separable electrodes and controls a removal process of removing foreign matter on the electrodes by the arc, The control unit time-series information indicating a period length between a first time point and a second time point that is later than the first time point; environmental information continuously indicating the environmental state of the electrode between the first time point and the second time point; deriving a processing condition that determines an arc generation state due to the removal processing at the second time point based on the time-series information and the environmental information; It is something. [Effects of the Invention]

[0009] According to the maintenance device of the present disclosure, it is possible to obtain a maintenance device that can accurately remove foreign matter on an electrode using an arc that is ensured to be appropriately generated, and that can also suppress deterioration of the electrode. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a block diagram showing a schematic configuration of a maintenance device according to a first embodiment. [Figure 2] 1 is a diagram showing a schematic configuration of a switch that is a maintenance target of a maintenance device according to a first embodiment. [Figure 3] 1 is a diagram showing a motor control center in which a switch according to a first embodiment is housed; [Figure 4] FIG. 3 is a diagram showing a control flow of the maintenance device according to the first embodiment. [Figure 5] FIG. 3 is a diagram showing a neural network of a control unit according to the first embodiment. [Figure 6] FIG. 10 is a diagram showing a state in which a plurality of motor control centers each accommodating a switch according to a second embodiment are installed. [Figure 7] FIG. 2 is a diagram illustrating a hardware configuration of a control device. DETAILED DESCRIPTION OF THE INVENTION

[0011] Embodiment 1 FIG. 1 is a block diagram showing a schematic configuration of a maintenance device 30 according to the first embodiment. FIG. 2 is a diagram showing a schematic configuration of a switch 40 that is the target of maintenance processing by the maintenance device 30 according to the first embodiment. FIG. 3 is a diagram showing a motor control center 100 in which the switch 40 shown in FIG. 2 is housed.

[0012] The maintenance device 30 of this embodiment controls a conditioning process that removes insulating films such as natural sulfide films as foreign matter that occur on the electrodes of a switchgear 40 housed in a motor control center 100 installed in a factory or the like. The removal of foreign matter by this conditioning process is mainly carried out before the switch 40 is put into operation, during a maintenance period for the switch 40, etc. Specifically, when the electrode material is silver, the foreign matter refers to an insulating film such as silver oxide or silver sulfide that is formed when the silver on the electrode surface is exposed to an atmosphere containing oxygen or sulfur and oxidized or sulfurized, or an accumulation of flux, silicon, etc. present in the atmosphere.

[0013] First, the configuration of the switch 40 will be described with reference to FIG. The switch 40 includes a pair of electrodes that can be separated from each other: a fixed electrode 41A and a movable electrode 41B. The movable electrode 41B moves toward and away from the fixed electrode 41A, and opens and closes the electric path by coming into contact with and separating from the fixed electrode 41A. Hereinafter, when there is no need to distinguish between the fixed electrode 41A and the movable electrode 41B, they will be referred to as electrodes 41.

[0014] As shown in FIG. 3, the switch 40 is housed in a unit U and then installed in a motor control center 100 as a switching device, and opens and closes electrical circuits for controlling machinery in a factory or the like.

[0015] Next, the configuration of the maintenance device 30 will be described with reference to FIG. As shown in FIG. 1, the maintenance device 30 includes a control unit 10 and a resistance measurement unit 20 serving as a measurement unit. The control unit 10 includes a determination unit 1, a condition determination unit 2, an execution unit 3, a time-series information database 4, and an environmental information database 5. The resistance measuring unit 20 measures the contact resistance value of the contact portion between the electrodes 41 .

[0016] The determining unit 1 determines, based on the result of measurement of the contact resistance value by the resistance measuring unit 20, whether or not a conditioning process as a removal process for removing foreign matter on the electrode 41 needs to be performed.

[0017] The condition determination unit 2 determines conditioning conditions as processing conditions that determine the arc generation state between the electrodes 41 based on the measurement results of the resistance measurement unit 20, a time-series information database 4, and an environmental information database 5, which will be described in detail later. The conditioning conditions include, for example, the number of times the switch 40 is turned on and off while current is flowing between the electrodes 41 of the switch 40, the current flowing between the electrodes 41 of the switch 40, the voltage value at the electrodes 41, etc.

[0018] The execution unit 3 controls the switch 40 based on the conditioning conditions determined by the condition determination unit 2, and performs a conditioning process to remove foreign matter such as an insulating film on the electrode 41 by using the generated arc.

[0019] In the time-series information database 4, time-series information T of the electrodes 41 is recorded. The time-series information T is information indicating the length of a period from the time when the electrode 41 is shipped from the factory as a first time point to the time when the electrode 41 starts to be in actual operation as a second time point, that is, the time when the conditioning process is performed. Therefore, for example, if the switchgear 40 is provided in a switchboard, the time-series information T may include the year and month of manufacture of the MCCB, the year and month of manufacture of the switchboard, the year and month of installation of the switchboard, etc.

[0020] In the environmental information database 5, environmental information C of the electrode 41 is continuously recorded during the period from the time of shipment of the switch 40 as a first time point to the time of start of operation as a second time point. The environmental information C includes, for example, the position information of the electrode 41, the distance of the electrode 41 from the coastline as position information, meteorological information around the electrode 41, temperature information as atmospheric information in the space where the electrode 41 is installed, humidity information, atmospheric pressure information, sulfur oxide (SOx) concentration, hydrogen sulfide (H2S) concentration, chlorine (Cl2) concentration, hydrogen chloride (HCl) concentration, etc. For example, if the environmental information C is temperature information, the temperature transition from the time the switch 40 is shipped until it is put into actual operation is continuously recorded.

[0021] The control of the maintenance device 30 of this embodiment will be described below with reference to a flow chart. FIG. 4 is a diagram showing a control flow of the maintenance device 30 according to the first embodiment. First, the contact resistance value of the contact portion of the switch 40 is measured by the resistance measuring unit 20 (step S001).

[0022] Next, the determination unit 1 determines whether the contact resistance value measured by the resistance measurement unit 20 is equal to or less than a reference value (step S002). If the judgment result is "good", that is, if the contact resistance value is equal to or less than the reference value (step S002: YES), the conditioning process for the electrode 41 is not performed. If the determination result is "bad", that is, if the contact resistance value exceeds the reference value (step S002: NO), the flow proceeds to a flow for determining the conditioning conditions for the electrode 41. The reference value is set based on, for example, the judgment criteria of the manufacturer that produces the switch 40 at the time of shipping.

[0023] Next, the condition determining unit 2 acquires the time-series information T and the environmental information C for determining the conditioning conditions of the electrode 41 from the environmental information database 4 and the time-series information database 4 (steps S003 and S004).

[0024] As described above, the electrodes 41 of the switch 40, for example, the electrodes 41 of the MCCB, are generally made of a silver alloy, and insulating films such as natural sulfide films are formed over time as foreign matter, increasing the contact resistance of the contacts. Furthermore, regardless of the material of the electrodes 41 of the switch 40, if silicon is present in the atmosphere, silicon will adhere and accumulate on the electrodes as foreign matter, increasing the contact resistance. The contact resistance value of the switch 40 is properly controlled at the time of shipment from the manufacturer, but is not controlled during the period from shipment from the manufacturer until the switch is used, and the contact resistance may increase during this period.

[0025] Generally, switches are rarely used immediately after shipping from the manufacturer. For example, after being incorporated into a switchboard by the switchboard manufacturer, the switchboard is installed in the electrical room of the factory where the switchboard is shipped, and the electrical circuits between the power source and the power destination are connected. Therefore, there may be a long period between shipping and the start of operation. The conditions for the formation of insulating films, which cause an increase in contact resistance, depend on the length of the period between shipping from the manufacturer and the start of operation, as well as the surrounding environment.

[0026] The condition determining unit 2 of this embodiment derives conditioning conditions based on the acquired time-series information T, the environmental information C, and the contact resistance value measured in step S002 (step S005). As described above, the conditioning conditions to be derived include the number of times the switch 40 is turned on / off while it is energized, the current flowing through the switch 40, and the like. The conditioning conditions to be derived are not limited to those exemplified above, and may be any conditions that adjust the arc generation state between the electrodes 41. The number of conditioning conditions derived may be one or more.

[0027] Next, the execution unit 3 performs a conditioning process on the electrode 41 under the conditioning conditions derived by the condition determination unit 2 (step S006). In this way, the insulating film formed on the electrode 41 can be removed by the arc that occurs when the switch is switched from "closed (ON state)" to "open (OFF state)" while current is flowing.

[0028] Here, for example, even if conditioning processing is performed under the same conditioning conditions on multiple switches 40 that have approximately the same contact resistance values ​​at the time of performing the conditioning processing, the contact resistance values ​​after performing the conditioning processing may differ for each switch 40.

[0029] That is, even if the contact resistance values ​​of multiple switches 40 at the time of performing the conditioning process are approximately the same, the type and thickness of foreign matter generated on the electrodes 41 may differ depending on the environment and period in which each switch 40 has been placed after shipping. For example, if sulfide gas and salt are present in the atmosphere after shipping, the foreign matter generated on the electrodes 41 will be sulfides and chlorides. Furthermore, because the process by which the foreign matter is generated differs, the appropriate conditioning conditions at the start of operation of the switches 40 may differ for each switch 40.

[0030] The maintenance device 30 in this embodiment derives conditioning conditions based on time-series information T indicating the length of the period from the time of shipment from the manufacturer to the time of operation start, and environmental information C that continuously records the environment in which the switchgear 40 was placed from the time of shipment to the time of operation start. This allows conditioning processing to be performed under appropriate conditioning conditions regardless of the length of the period until the switchgear 40 starts operation or its surrounding environment.

[0031] As an example of adjusting the conditioning conditions, if the current flowing through electrode 41 is large, the arc generated when switch 40 is opened and closed will also be large, making it easier to remove the insulating film. Also, by opening and closing the switch multiple times, it is possible to stably remove the insulating film that could not be removed by a single opening and closing.

[0032] It is desirable to set upper limits on the current flow and the number of times the switch 40 is opened and closed during the conditioning process, because the manufacturer determines the current that can be passed and the number of times the switch 40 can be opened and closed depending on the specifications of the switch 40. In this way, an appropriate arc generation state is ensured according to the state of the foreign matter being generated, allowing the foreign matter on the electrode 41 to be removed with high precision, while preventing the generation of an arc larger than necessary, thereby suppressing deterioration of the electrode 41. Furthermore, the environmental information C is a continuous record of the environment in which the switch 40 was placed from the time of shipment to the time of start of operation, but in deriving the conditioning conditions, for example, an average value of information such as temperature continuously recorded in the environmental information C may be used.

[0033] Next, the contact resistance value is measured again by the resistance measuring unit 20 (step S007). Next, the determination unit 1 determines whether the contact resistance value measured by the resistance measurement unit 20 is equal to or less than a reference value (step S008). If the judgment result is "good", that is, if the contact resistance value is equal to or less than the reference value (step S008: YES), no further conditioning process of the electrode 41 is performed. If the judgment is "bad", that is, if the contact resistance value exceeds the reference value (step S008: NO), the condition determination unit 2 determines the conditioning conditions again using the contact resistance value after the conditioning process, performs the conditioning process, and repeats this process.

[0034] If the change in the contact resistance value after conditioning is less than a predetermined amount compared to the contact resistance value before conditioning, conditioning is discontinued because no improvement due to arcing is expected.

[0035] The method for acquiring the environmental information C will be explained below. The environmental information C may be a record of both global environmental information C1, which is information obtained via a network from, for example, weather information provided by public institutions such as the Japan Meteorological Agency, and local environmental information C2, which is information obtained from thermometers, barometers, etc. installed in the factory or electrical room where the motor control center 100 is installed. The global environmental information C1 is, for example, information such as temperature and humidity, atmospheric pressure, and sulfur dioxide (SO2) concentration provided by the Japan Meteorological Agency.

[0036] In this case, when determining the conditioning conditions, the condition determination unit 2 determines the conditions using the global environment information C1 and the local environment information C2. When the global environment information C1 and the local environment information C2 have the same information, for example, temperature (room temperature), when the condition determination unit 2 determines the conditioning conditions, the temperature (room temperature) in the local environment information C2 is used to determine the conditioning conditions.

[0037] When the condition determining unit 2 determines the conditioning conditions, if there is insufficient information in the local environment information C2, the insufficient information is supplemented by the global environment information C1.

[0038] By using the environmental information C as described above, the conditioning conditions can be determined using information indicating the actual environment in which the switch 40 is installed, and therefore the accuracy of setting the conditioning conditions can be improved. Furthermore, information that is not obtained from thermometers, barometers, etc. installed in the factory or electrical room where the switchgear 40 is installed can be supplemented using global environmental information C1 on the network, thereby improving the accuracy of setting conditioning conditions.

[0039] Furthermore, the environmental information C may be obtained by associating the location information of the electrode 41 during the period between the time of shipment and the time of start of operation with weather information around the electrode 41 and atmospheric information in the space where the electrode is installed during this period, and recording each of these continuously over this period. As a result, for example, if the environmental information C indicates that the installation location of the switchgear 40 is close to the coast and wind and rain have continued since shipment, it can be estimated that the electrode 41 has been exposed to salty water or the like for a long period of time. In this way, the condition determining unit 2 can derive optimal conditioning conditions using the environmental information C in which weather information is associated with location information as described above.

[0040] In the above example, the condition determination unit 2 derives the conditioning conditions based on the time-series information T, the environmental information C, and the contact resistance value at the start of operation. However, the conditioning conditions may be derived using only the time-series information T and the environmental information C without using the contact resistance value.

[0041] Alternatively, in addition to the time-series information T and the environmental information C, information on changes in the state of the electrodes 41 between the time of shipment and the time of the start of operation may be used. The state change information may be estimated by the control unit 10 based on the time-series information T and the environmental information C. For example, if the environmental information C indicates that the switch 40 is installed near the coast, the control unit 10 estimates, as the state change information, the generation of silver chloride on the electrode 41 due to salt damage. The condition determining unit 2 may then derive optimal conditioning conditions based on the time-series information T, the environmental information C, and further, the generation of silver chloride as state change information.

[0042] Alternatively, the state change information may be the amount of change between the first contact resistance value at the time of shipment as the first time point and the second contact resistance value at the start of operation as the second time point. In a case where a plurality of switches 40 have the same contact resistance value at the start of operation, and the amount of change from the first contact resistance value at the time of shipment differs for each switch 40, the appropriate conditioning conditions may differ for each switch 40. Therefore, by deriving the conditioning conditions using the amount of change in contact resistance value from the time of shipment as described above, it is possible to perform optimal conditioning processing for each switch 40.

[0043] Furthermore, the amount of change between the first contact resistance value and the second contact resistance value as state change information is not limited to that derived by estimation by the control unit 10 as described above, but may also be the actual amount of change actually measured by the resistance measuring unit 20. Furthermore, the state change information may be the amount of change between the thickness of the insulating film on the electrode 41 at the time of shipment as a first time point and the thickness of the insulating film on the electrode 41 at the start of operation as a second time point.

[0044] In the above description, the first time point is the time of shipment from the manufacturer, and the second time point is the time of operation start, but the first and second time points are not limited to this. For example, the first time point may be the time of operation start, and the second time point may be the time of operation stop. This makes it possible to derive appropriate conditioning conditions when maintenance of the switch 40 is due after operation.

[0045] An example in which the condition determining unit 2 derives conditioning conditions using AI (Artificial Intelligence) will be described below. FIG. 5 is a diagram showing the neural network of the control unit 10 of this embodiment. A case where the control unit 10 performs machine learning through supervised learning will be described.

[0046] The control unit 10 acquires time-series information T and environmental information C as input 1, which are learning data. Furthermore, the control unit 10 acquires appropriate conditioning conditions (correct answers) corresponding to the time-series information T and the environmental information C as learning data as the input 2.

[0047] The control unit 10 learns the output based on the learning data obtained by combining the above-mentioned input 1 and input 2 (correct answer). That is, a learned model is generated that infers the optimal conditioning conditions from the time-series information T from the time of shipment of the switch 40 to the time of start of operation, the environmental information C (input 1) that continuously indicates the environment during that period, and the feature amount of input 2 (correct answer), which is the conditioning condition.

[0048] A case where the control unit 10 applies a neural network as an example of a learning algorithm will be described. A neural network consists of an input layer consisting of multiple neurons, an intermediate layer (hidden layer) consisting of multiple neurons, and an output layer consisting of multiple neurons. The intermediate layer may be one layer, or two or more layers.

[0049] For example, in a three-layer neural network like the one shown in Figure 5, when multiple inputs are input to the input layer (X1-X3), the values ​​are multiplied by weight W1 (w11-w16) and input to the middle layer (Y1-Y2), and the result is further multiplied by weight W2 (w21-w26) and output from the output layer (Z1-Z3). This output result changes depending on the values ​​of weights W1 and W2.

[0050] In the control unit 10 of this embodiment, the neural network learns the output by supervised learning in accordance with the learning data created based on the combination of the acquired input 1 and input 2 (correct answer), as described above. That is, the neural network learns by inputting input 1 to the input layer and adjusting the weights W1 and W2 so that the result output from the output layer approaches input 2 (correct answer). By performing such learning, a trained model is constructed.

[0051] The control unit 10 inputs the acquired time-series information T and environmental information C into the constructed trained model, thereby deriving optimal conditioning conditions according to the time-series information T and environmental information C. In this way, the conditioning conditions are determined by big data analysis using artificial intelligence.

[0052] Although the above describes processing using supervised learning, the present invention is not limited to this. For example, unsupervised learning may be performed to derive the trends, classifications, and correlations between the time-series information T and the environmental information C, and to derive optimal conditioning conditions.

[0053] Although an example has been given in which only the time-series information T and the environmental information C are used as learning data, the present invention is not limited to this. The learning data may include, for example, conditioning conditions that have been derived in the past based on the time-series information T and the environmental information C, the contact resistance values ​​before and after the conditioning process under those conditioning conditions, recommended conditioning conditions indicated in the specifications provided by the manufacturer, information on changes in the state of the electrode between the time of shipment and the time of start of operation, the first resistance value which is the contact resistance value at the time of shipment, the second resistance value which is the contact resistance value at the time of start of operation, the amount of change between the first contact resistance value and the second contact resistance value, image data of the electrode 41 between the time of shipment and the time of start of operation, etc.

[0054] For example, if the amount of change in contact resistance under the conditioning conditions executed in the past is used as learning data, conditioning conditions can be derived that take into account the past performance of the conditioning process, thereby improving the accuracy of setting the conditioning conditions.

[0055] The maintenance device of this embodiment configured as described above has the following features: A maintenance device including a control unit that generates an arc between a pair of separable electrodes and controls a removal process of removing foreign matter on the electrodes by the arc, The control unit time-series information indicating a period length between a first time point and a second time point that is later than the first time point; environmental information continuously indicating the environmental state of the electrode between the first time point and the second time point; deriving a processing condition that determines an arc generation state due to the removal processing at the second time point based on the time-series information and the environmental information; It is something.

[0056] This allows foreign matter on the electrode to be removed with high precision using an arc that is generated in an appropriate state, and also prevents problems caused by the conditioning process by suppressing deterioration of the electrode due to, for example, excessive arc generation. Furthermore, by properly removing foreign matter from the electrodes, the contact resistance value is reduced, which suppresses current loss, enabling electricity charges to be reduced, and costs to be saved.Furthermore, it is possible to suppress the temperature rise in the switchgear due to heat generated from the switchgear caused by current loss, and the thermal degradation of the switchgear, such as the shortened lifespan of electrolytic capacitors due to the temperature rise.

[0057] In addition, in the maintenance device of this embodiment configured as described above, The control unit deriving state change information of the electrode between the first time point and the second time point based on the time-series information and the environmental information; deriving the processing condition at the second time point based on the time-series information, the environmental information, and further based on the state change information; It is something.

[0058] The conditions under which foreign matter that causes an increase in contact resistance occurs and the type of foreign matter depend on the length of time between the time of shipment from the manufacturer and the time of start of operation, and the surrounding environment. In this way, the control unit derives information on changes in the state of the electrode between the first and second points in time based on the time series information and environmental information, and uses the information on changes in state such as the type and thickness of the generated foreign matter in determining the conditioning conditions, thereby improving the accuracy of setting the conditioning conditions.

[0059] Embodiment 2 The second embodiment will be described below with reference to the drawings, focusing on the differences from the first embodiment. FIG. 6 is a diagram showing a state in which a plurality of motor control centers 100, each accommodating a switch 40, are installed, similar to the first embodiment.

[0060] The condition determination unit 2 of this embodiment derives conditioning conditions for the switches 40 in the motor control center 100 for which conditioning processing has not been performed, using past performance data from conditioning processing for the switches 40 in the motor control center 100 for which conditioning processing has already been performed.

[0061] 6, the first switching device, which is a switching device that has already undergone conditioning processing, is shown as motor control center 100A and motor control center 100B. Also, the second switching device, which is a switching device that has not undergone conditioning processing because it has been newly delivered, is shown as motor control center 100C. When there is no need to distinguish between the motor control centers 100A, 100B, and 100C, they will be referred to as motor control center 100.

[0062] The control unit 10 stores and stores time-series information T and environmental information C for each of the motor control centers 100A, 100B, and 100C. The condition determination unit 2 uses the time series information T and environmental information C of the motor control centers 100A and 100B that have already undergone conditioning processing, and the conditioning conditions, to derive the conditioning conditions at the start of operation of the motor control center 100C that has not undergone conditioning processing.

[0063] That is, the condition determination unit 2 derives the conditioning conditions for the switching device on which the conditioning process is to be newly performed, using the past conditioning conditions for the switching device on which the conditioning process is to be newly performed and for switching devices placed in the same environment. This allows the conditioning conditions to be derived taking into account the results of past conditioning processes, thereby improving the accuracy of setting the conditioning conditions.

[0064] In addition, the condition determination unit 2 may derive the conditioning conditions for the motor control center 100C using the time-series information T and environmental information C of the motor control centers 100A and 100B that have already undergone conditioning processing, the conditioning conditions, and also information on the state changes of the electrodes 41 before and after the conditioning processing is performed under these conditioning conditions. That is, by using, for example, the amount of change in contact resistance value as information on the change in state of the electrode 41 before and after the conditioning process as a result of past conditioning processes, the accuracy of setting the conditioning conditions can be further improved.

[0065] Furthermore, the condition determining unit 2 may derive the conditioning conditions as follows. The condition determining unit 2 derives the amount of change in contact resistance value before and after the execution of the conditioning process for each of a plurality of first switching devices that have undergone the same conditioning process based on the same conditioning conditions. Then, the condition determination unit 2 derives the conditioning process conditions at the start of operation of the second switching device based on the time-series information T and environmental information C of each first switching device and the amount of change of each first switching device.

[0066] A plurality of first switching devices that have undergone the same conditioning process based on the same conditioning conditions will not necessarily produce the same processing results. That is, since the conditioning conditions depend on the time-series information T and the environmental information C since the switch 40 was shipped, the accuracy of setting the conditioning conditions can be further improved by using past performance data of switches 40 that have different processing results.

[0067] The hardware configuration of the control unit 10 of this embodiment will be described below. FIG. 7 is a diagram showing the hardware configuration of the control device, which is the control unit 10. As shown in FIG. 7, an example of hardware of the control device serving as the control unit 10 is configured to include a processor 11 and a storage device 12 that stores the time-series information database 4 and the environmental information database 5. The storage device 12 includes a volatile storage device such as a random access memory and a non-volatile auxiliary storage device such as a flash memory, both of which are not shown. Also, an auxiliary storage device such as a hard disk may be provided instead of flash memory. Processor 11 executes a program input from storage device 12. In this case, the program is input from the auxiliary storage device to processor 11 via a volatile storage device. Processor 11 may output data such as calculation results to a volatile storage device of storage device 12, or may store data in the auxiliary storage device via the volatile storage device.

[0068] Although the present disclosure describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not exemplified are conceivable within the scope of the technology disclosed in this specification, including, for example, cases where at least one component is modified, added, or omitted, and cases where at least one component is extracted and combined with components of another embodiment.

[0069] Various aspects of the present disclosure are summarized below as appendices.

[0070] (Appendix 1) A maintenance device including a control unit that generates an arc between a pair of separable electrodes and controls a removal process of removing foreign matter on the electrodes by the arc, The control unit time-series information indicating a period length between a first time point and a second time point that is later than the first time point; environmental information continuously indicating the environmental state of the electrode between the first time point and the second time point; deriving a processing condition that determines an arc generation state due to the removal processing at the second time point based on the time-series information and the environmental information; Maintenance equipment. (Appendix 2) The control unit deriving state change information of the electrode between the first time point and the second time point based on the time-series information and the environmental information; The state change information is used in deriving the processing condition at the second time point. 10. The maintenance device of claim 1. (Appendix 3) a plurality of switching devices each having a pair of the electrodes are installed in the same space, The control unit The time-series information and the environmental information for each of the switching devices are recorded and stored, The time-series information and the environmental information of a first switching device that is the switching device for which the removal process has been performed among the plurality of switching devices; and using at least one of the processing conditions executed in the first switching device and the state change information of the electrode derived in the first switching device, deriving the processing condition at the second time point of a second opening and closing device, which is the opening and closing device on which the removal processing has not been performed; 10. A maintenance device as described in Appendix 2. (Appendix 4) the control unit derives a processing change amount, which is a change amount of the contact resistance value between the electrodes before and after the removal processing, for each of the first opening and closing devices in which the removal processing has been performed under the same processing conditions; The process change amount of each of the first switching devices is used in deriving the process condition of the second switching device at the second time point. 10. A maintenance device as described in Appendix 3. (Appendix 5) The control unit The status change information includes: deriving a change amount between a first contact resistance value, which is a contact resistance value between the electrodes at the first time point, and a second contact resistance value, which is the contact resistance value between the electrodes at the second time point; 5. A maintenance device according to any one of claims 2 to 4. (Appendix 6) a measuring unit that measures the contact resistance value between the electrodes, The control unit The measurement unit measures a first contact resistance value, which is a contact resistance value between the electrodes at the first time point, and a second contact resistance value, which is the contact resistance value between the electrodes at the second time point, deriving an actual change amount that is an actual change amount between the first contact resistance value and the second contact resistance value; The actual change amount is used in deriving the processing condition at the second time point. 6. A maintenance device according to any one of claims 1 to 5. (Appendix 7) The control unit constructing a trained model that is generated based on training data including the time-series information and the environmental information, and that derives the processing condition at the second time point according to the time-series information and the environmental information; deriving the processing condition at the second time point based on the trained model using the acquired time-series information and the environmental information; 7. The maintenance device according to any one of claims 1 to 6. (Appendix 8) The control unit As the learning data for constructing the trained model, At least one of the processing conditions derived according to the time-series information and the environmental information, the processing conditions in the removal processing indicated in a specification, information on a change in state of the electrodes between the first time point and the second time point, a first contact resistance value which is a contact resistance value between the electrodes at the first time point, a second contact resistance value which is the contact resistance value at the second time point, a change amount between the first contact resistance value and the second contact resistance value, the processing conditions in the removal processing at the second time point, and a change amount of the contact resistance value before and after execution of the removal processing is used. 8. The maintenance device according to claim 7. (Appendix 9) the control unit uses, as the environmental information, at least one of position information of the electrode, a distance of the electrode from a coastline as the position information, meteorological information around the electrode, temperature information as atmospheric information in a space where the electrode is installed, humidity information, atmospheric pressure information, a concentration of sulfur oxides, a concentration of hydrogen sulfide, a concentration of chlorine, and a concentration of hydrogen chloride; 9. The maintenance device according to claim 8. (Appendix 10) The control unit weather information around the electrode and atmospheric information in a space in which the electrode is installed during the period between the first time point and the second time point are recorded as the environmental information in association with the position information of the electrode during the period between the first time point and the second time point; 7. The maintenance device according to any one of claims 1 to 6. (Appendix 11) The processing conditions that determine the arc generation state due to the removal processing are: At least one of the number of times of opening and closing, current value, current direction, and voltage value of the pair of electrodes that are energized, 7. The maintenance device according to any one of claims 1 to 6. [Explanation of symbols]

[0071] 10 control unit, 20 resistance measurement unit (measurement unit), 30 maintenance device, 40 switch, 41 electrode, 41A fixed electrode, 41B movable electrode, 100 Motor control center (switchgear), 100A, 100B Motor control center (first switchgear), 100C Motor control center (second switchgear), T Time series information, C Environmental information.

Claims

1. A maintenance device including a control unit that generates an arc between a pair of separable electrodes and controls a removal process of removing foreign matter on the electrodes by the arc, The control unit time-series information indicating a period length between a first time point and a second time point that is later than the first time point; environmental information continuously indicating the environmental state of the electrode between the first time point and the second time point; deriving a processing condition that determines an arc generation state due to the removal processing at the second time point based on the time-series information and the environmental information; Maintenance equipment.

2. The control unit deriving state change information of the electrode between the first time point and the second time point based on the time-series information and the environmental information; the state change information is used in deriving the processing condition at the second time point; The maintenance device according to claim 1 .

3. a plurality of switching devices each having a pair of the electrodes are installed in the same space, The control unit The time-series information and the environmental information for each of the switching devices are recorded and stored, The time-series information and the environmental information of a first opening / closing device that is the opening / closing device that has been subjected to the removal process among the plurality of opening / closing devices; and and using at least one of the processing conditions executed in the first switching device and the state change information of the electrode derived in the first switching device, deriving the processing condition at the second time point of a second opening and closing device that is the opening and closing device on which the removal processing has not been performed; The maintenance device according to claim 2 .

4. the control unit derives a processing change amount, which is a change amount of the contact resistance value between the electrodes before and after the removal process, for each of the first opening and closing devices on which the removal process has been performed under the same processing condition; The process change amount of each of the first switching devices is used in deriving the process condition of the second switching device at the second time point. The maintenance device according to claim 3 .

5. The control unit The status change information includes: deriving a change amount between a first contact resistance value, which is a contact resistance value between the electrodes at the first time point, and a second contact resistance value, which is the contact resistance value between the electrodes at the second time point; The maintenance device according to claim 4.

6. a measuring unit that measures the contact resistance value between the electrodes, The control unit The measurement unit measures a first contact resistance value, which is a contact resistance value between the electrodes at the first time point, and a second contact resistance value, which is the contact resistance value between the electrodes at the second time point, deriving an actual change amount that is an actual change amount between the first contact resistance value and the second contact resistance value; the actual change amount is used in deriving the processing condition at the second time point; The maintenance device according to claim 4.

7. The control unit constructing a trained model that is generated based on training data including the time-series information and the environmental information and that derives the processing condition at the second time point according to the time-series information and the environmental information; deriving the processing condition at the second time point based on the trained model using the acquired time-series information and the environmental information; The maintenance device according to any one of claims 1 to 6.

8. The control unit As the learning data for constructing the trained model, At least one of the processing conditions derived according to the time-series information and the environmental information, the processing conditions in the removal processing indicated in a specification, information on a change in state of the electrodes between the first time point and the second time point, a first contact resistance value which is a contact resistance value between the electrodes at the first time point, a second contact resistance value which is the contact resistance value at the second time point, a change amount between the first contact resistance value and the second contact resistance value, the processing conditions in the removal processing at the second time point, and a change amount of the contact resistance value before and after execution of the removal processing is used. The maintenance device according to claim 7.

9. the control unit uses, as the environmental information, at least one of position information of the electrode, a distance of the electrode from a coastline as the position information, meteorological information around the electrode, temperature information as atmospheric information in a space where the electrode is installed, humidity information, atmospheric pressure information, a concentration of sulfur oxides, a concentration of hydrogen sulfide, a concentration of chlorine, and a concentration of hydrogen chloride; The maintenance device according to claim 8.

10. The control unit weather information around the electrode and atmospheric information in a space in which the electrode is installed during the period between the first time point and the second time point are recorded as the environmental information in association with the position information of the electrode during the period between the first time point and the second time point. The maintenance device according to any one of claims 1 to 6.

11. The processing conditions that determine the arc generation state due to the removal processing are: At least one of the number of times of opening and closing, current value, current direction, and voltage value of the pair of electrodes that are energized, The maintenance device according to any one of claims 1 to 6.

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