JP5459857B2 - Life diagnosis method of power switchgear, diagnosis system and diagnosis program thereof - Google Patents

Description

  Embodiments described herein relate generally to a life diagnosis method, a diagnosis system, and a diagnosis program for diagnosing the life of a power switchgear.

  In recent years, the importance of power transmission systems has increased. For this reason, high reliability is required for power switching devices used in substations or switching stations. In addition, due to the background of the power liberalization, demand for cost reduction of power equipment is increasing. On the other hand, each electric power company, both domestic and overseas, has a large number of power switchgears that have been aged after being installed for a long time.

  The service life of the power switchgear is determined, for example, by using a fixed number of operations, an update period of about 20 years, and the like as a guide. The switchgear for electric power is managed and renewed based on the estimated life. In addition, the power switchgear may be periodically inspected. In this periodic inspection, the state of the entire power switchgear is often diagnosed based on indirect standards such as operation time.

JP-A-11-229180

  However, the life diagnosis method based on the number of operations or the update period does not take into account the characteristics peculiar to the device.

  For example, in a power switchgear, excessive wear may occur at a contact portion constituting an energization circuit after long-term operation. The occurrence of excessive wear not only adversely affects the current-carrying performance, but also may reduce the insulation performance due to the generated wear powder. For this reason, excessive wear of the contact portion is not preferable for the power switchgear. The cause of excessive wear is not only wear due to aging but also an irregular phenomenon such as biting of foreign matter into the sliding surface. A typical example of wear due to aging is wear due to micro sliding. This wear due to micro sliding is generically called fretting. Micro sliding is a phenomenon that causes surface damage.

  The cause of the micro-sliding can be a vibration caused by energization, a vibration transmitted from another device to the installation location, or a displacement difference due to thermal expansion / contraction due to a temperature change acting on the switching device. Even in the case of microsliding due to any cause, the wear of the contact portion proceeds even if the sliding state is not accompanied by the operation of the power switchgear.

  Further, a decomposition product of the insulating medium is generated at the contact portion constituting the energization circuit of the power switchgear when the current is interrupted. This decomposition product affects the amount of wear due to micro sliding. For example, when the insulating medium is sulfur hexafluoride gas, the decomposition product is a metal compound mainly composed of copper fluoride or the like. Such decomposition products may promote wear by being interposed on the sliding surface of the contact portion.

  As described above, when the wear of the contact portion of the power switchgear is affected by the characteristics peculiar to the device, the life cannot be accurately diagnosed.

  Accordingly, an object of an embodiment of the present invention is to provide a method for diagnosing the life of a power switchgear that takes into account the characteristics unique to the device.

  The life diagnosis method for a power switchgear according to an aspect of the present invention is a power switchgear life diagnosis method for diagnosing the life of a power switchgear using a computer, wherein the computer Based on the device-specific data that is data specific to the power switchgear and the operating environment data that is data related to the operating environment of the power switchgear, the minute slide generated at the contact portion constituting the energization circuit of the power switchgear A step of determining the number of movements, and the computer determines the amount of decomposition products mixed into the contact portion based on the device-specific data and interruption information data which is data relating to current interruption by the power switchgear. The wear of the contact portion due to micro-sliding based on the number of micro-sliding times and the amount of degradation products mixed A step of computing, the computer, and a step of based on said amount of wear, to diagnose the lifetime of the power switching device.

The block diagram which shows the structure of the maintenance support system of the switchgear for electric power which concerns on embodiment of this invention. The block diagram which shows the basic composition of the general purpose computer which comprises the system for maintenance assistance which concerns on this embodiment. The block diagram which shows the data flow of the system for maintenance assistance which concerns on this embodiment. The graph figure which shows the typical example of the wear amount calculation data used for the calculation in the wear amount calculation part by the micro sliding which concerns on this embodiment. The schematic diagram which shows the typical example of the wear amount correction | amendment data for correct | amending the wear amount based on the component replacement | exchange history in the wear amount correction | amendment part which concerns on this embodiment. The schematic diagram which shows the typical example of the wear amount correction | amendment data for correct | amending the wear amount based on the operation history in the wear amount correction | amendment part which concerns on this embodiment concerning this embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment)
FIG. 1 is a configuration diagram showing a configuration of a maintenance support system 1 for a power switchgear according to an embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same part in subsequent figures, the detailed description is abbreviate | omitted, and a different part is mainly described. In the following embodiments, the same description is omitted.

  A maintenance support system 1 for a power switchgear is configured by incorporating a maintenance support program 3 that is software in a general-purpose computer 2 as hardware. The maintenance support program 3 includes a database unit 4 and a life diagnosis unit 5. The database unit 4 stores information used for life diagnosis of the power switchgear. The life diagnosis unit 5 performs arithmetic processing for diagnosing the life of the power switchgear based on information stored in the database unit 4.

  FIG. 2 is a configuration diagram showing a basic configuration of the general-purpose computer 2 constituting the maintenance support system 1 according to the present embodiment.

  The basic configuration of the general-purpose computer 2 includes an input unit 91, an output unit 92, an interface 93, a calculation unit 94, a memory 95, a storage device 96, and a bus 97. The input unit 91 and the output unit 92 are connected to the bus 97 via the interface 93. A calculation unit 94, a memory 95, and a storage device 96 are connected to the bus 97. The input unit 91 is a keyboard or a mouse. The output unit 92 is a display or a printer. The arithmetic unit 94 is a central processing unit or a chip set. The memory 95 is a cache memory or the like for temporarily storing information for performing calculations by the calculation unit 94. The storage device 96 is a hard disk or the like for storing information.

  The maintenance support program 3 is stored in the storage device 96. In response to a request input from the input unit 91, the maintenance support program 3 causes the arithmetic unit 94 to execute arithmetic processing using the memory 95 as necessary. The maintenance support program 3 outputs the calculation processing result to the output unit 92.

  FIG. 3 is a block diagram showing a data flow of the maintenance support system 1 according to the present embodiment.

  The maintenance support program 3 includes a database unit 4 and a life diagnosis unit 5.

  The database unit 4 includes device-specific data 41, operation environment data 42, blocking information data 43, repair / inspection data 44, and operation frequency data 45.

  The device unique data 41 is basic data unique to the power switchgear. The device-specific data 41 includes a device type, device number, manufacturing time, standard recommended update period, a specified amount of wear for the part subject to life diagnosis, or a unit temperature change amount calculated based on the device configuration. Information such as the amount of micro sliding is included.

  The operation environment data 42 is data indicating the actual result or environment in which the power switchgear is actually operated. The operation environment data 42 includes information such as an operation history, a relocation history, an ambient temperature history, or an installation state history.

  The interruption information data 43 is data indicating a situation where current interruption is performed. The interruption information data 43 includes information such as an interruption current when the large current is interrupted, a history of arc time, or data for calculating the generation amount of decomposition products in consideration of a device configuration generated when the electric current is interrupted. .

  The repair / inspection data 44 is data relating to repair or inspection. The repair / inspection data 44 includes information such as a history of parts replacement by repair or inspection information such as operation time.

  The operation frequency data 45 is data relating to the operation frequency of the power switchgear. The operation frequency data 45 includes an operation history indicating a history of operations such as opening and closing, or information such as a specified number of times.

  The life diagnosis unit 5 includes a microsliding frequency determination unit 51, a decomposition product mixing amount determination unit 52, a wear amount calculation unit 53 by microsliding, a wear amount correction unit 54, and a remaining life diagnosis unit 55. I have.

  Based on the information included in the device-specific data 41 and the information included in the operation environment data 42, the micro-sliding frequency determination unit 51 is generated without an opening / closing operation at the contact portion constituting the energization circuit of the power switching device. Determine the effective number of micro-sliding. The microsliding frequency determination unit 51 outputs the determination result to the wear amount calculation unit 53 by microsliding.

  Based on the information included in the device-specific data 41 and the information included in the cutoff information data 43, the decomposition product mixing amount determination unit 52 moves to the sliding surface of the contact portion that constitutes the generation amount of the decomposition product and the energized portion. The mixing amount (ratio of sliding surface to lubricant) is determined. The decomposition product mixing amount determination unit 52 outputs the determination result to the wear amount calculation unit 53 by minute sliding.

  The wear amount calculation unit 53 by micro sliding is based on the determination result by the micro sliding number determination unit 51 and the determination result by the decomposition product mixing amount determination unit 52, and wear of the contact portion constituting the energization circuit by micro sliding. Calculate the amount. The wear amount calculation unit 53 due to minute sliding outputs the calculated wear amount to the wear amount correction unit 54.

  The wear amount correction unit 54 corrects the wear amount calculated by the wear amount calculation unit 53 based on information included in the repair / inspection data 44 and information included in the operation count data 45. The wear amount correction unit 54 outputs the corrected wear amount to the remaining life diagnosis unit 55.

  The remaining life diagnosis unit 55 collates the wear amount of the contact portion constituting the energization circuit of the power switching device corrected by the wear amount correction unit 54 with the wear amount specified value included in the device specific data 41, etc. Diagnose the remaining life of power switchgear.

  The maintenance support system 1 supports the manager for maintenance of the power switchgear based on the diagnosis result of the remaining life diagnosis unit 55.

  FIG. 4 is a graph showing a schematic example of wear amount calculation data used for calculation in the wear amount calculation unit 53 due to micro sliding according to the present embodiment. Graphs F1, F2, and F3 in the figure show the relationship between the number of micro-sliding and the amount of wear at the contact portion constituting the energization circuit of the power switchgear. The specified value (100%) of the wear amount (vertical axis) in FIG. 4 indicates the standard life of the power switchgear. The specified value (100%) of the number of micro-sliding (horizontal axis) in the figure indicates the standard life of the power switchgear when no decomposition products are mixed (graph F1).

  Graph F1 shows the relationship between the number of micro-sliding and the amount of wear when no decomposition product is mixed. Graph F2 shows the relationship between the number of micro-sliding and the amount of wear in the case of 1 wt% decomposition product contamination (ratio of sliding surface to lubricant). A graph F3 shows the relationship between the number of micro-sliding and the amount of wear when the decomposition product is 5 wt%.

  When the mixing ratio of the decomposition product of the insulating medium generated when the current is interrupted increases, the wear of the contact portion (sliding surface) constituting the energization circuit of the power switchgear is promoted.

  Therefore, the graph F2 in the case of 1 wt% decomposition product contamination has a larger wear amount with respect to the minimum number of sliding times than the graph F1 in the case of no decomposition product contamination. Similarly, the graph F3 with the decomposition product contamination of 5 wt% has a larger wear amount with respect to the minimum number of sliding times than the graph F2 with the decomposition product contamination of 1 wt%.

  FIG. 5 is a schematic diagram showing a typical example of wear amount correction data for correcting the wear amount based on the component replacement history in the wear amount correcting unit 54 according to the present embodiment. The specified value (100%) of the wear amount (vertical axis) in FIG. 5 indicates the standard life of the power switchgear.

  A graph F2 shows the relationship between the number of micro-sliding and the amount of wear in the case of 1 wt% of decomposition products before correction. Graph F4 shows the relationship between the number of micro-sliding and the amount of wear when the corrected decomposition product mixture is 1 wt%.

  If some parts are replaced at the time of repair or the like, the amount of wear at the contact portion constituting the energization circuit of the power switchgear is reduced.

  The wear amount correction unit 54 acquires a part replacement history from the repair / inspection data 44. When it is determined that the wear amount has been reduced based on the component replacement history, the wear amount correction unit 54 corrects the wear amount calculated by the wear amount calculation unit 53 in a direction to subtract the wear amount.

  That is, the wear amount correcting unit 54 corrects the uncorrected graph F2 based on the component replacement history to obtain the graph F4. The wear amount correction unit 54 corrects the wear amount based on the graph F4.

  FIG. 6 is a schematic diagram illustrating a schematic example of wear amount correction data for correcting the wear amount based on the operation history in the wear amount correcting unit 54 according to the present embodiment. The specified value (100%) of the wear amount (vertical axis) in FIG. 6 indicates the standard life of the power switchgear.

  A graph F2 shows the relationship between the number of micro-sliding and the amount of wear in the case of 1 wt% of decomposition products before correction. Graph F5 shows the relationship between the number of micro-sliding and the amount of wear when the corrected decomposition product mixture is 1 wt%.

  Here, it is assumed that the power switchgear is in operation and has already been operated multiple times.

  The wear amount correction unit 54 acquires an operation history from the operation count data 45. The wear amount correction unit 54 corrects the wear amount calculated by the wear amount calculation unit 53 in the direction of increasing the wear amount in accordance with the number of operations included in the operation history.

  That is, the wear amount correction unit 54 corrects the uncorrected graph F2 based on the operation history to obtain the graph F5. The wear amount correction unit 54 corrects the wear amount based on the graph F5.

  According to this embodiment, in order to calculate the amount of wear of the contact portion constituting the energization circuit of the power switchgear based on various information related to the power switchgear accumulated in the database unit 4, the power converter The accuracy of life diagnosis can be increased.

  Moreover, element characteristics peculiar to a device are determined from various factors depending on the manufacturer and model of the power switchgear. If the maintenance support system 1 is used, a person who is not familiar with the device and the operating state can accurately determine the aging state of the power switchgear. For this reason, anyone can accurately perform the life diagnosis of the power conversion device.

  The life diagnosis method using the maintenance support system 1 can perform life diagnosis without stopping even when the power switchgear is in an operating state.

  Therefore, the maintenance support system 1 can be applied to a power switchgear that is in operation, and a reasonable life diagnosis in consideration of various information related to the power switchgear, such as wear caused by a minute slide unique to the device. Can do. In addition, it is possible to determine the efficient and wasteful renewal time of the power switchgear. Therefore, the maintenance of the power switchgear using the maintenance support system 1 can ensure the reliability of the power switchgear as a product.

  The general-purpose computer 2 constituting the maintenance support system 1 may have any model and configuration. The configuration of the general-purpose computer 2 may be any combination of software and hardware.

  Further, in the present embodiment, in FIG. 4, when there is no decomposition product mixture (graph F1), the decomposition product mixture ratio is 1 wt% (graph F2), and the decomposition product mixture ratio is 5 wt% (graph F3). The case of ()) is shown in the figure, but it is possible to supplement the case of the other decomposition product mixing amount. In addition, when there is history data of the decomposition product mixing amount, the wear amount may be integrated based on the history data.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

  DESCRIPTION OF SYMBOLS 1 ... Maintenance support system, 2 ... General purpose computer, 3 ... Maintenance support program, 4 ... Database part, 5 ... Life diagnosis part, 41 ... Equipment specific data, 42 ... Operation environment data, 43 ... Shutdown information data, 44 ... repair / inspection data, 45 ... operation frequency data, 51 ... minute sliding number determination unit, 52 ... decomposition product mixing amount determination unit, 53 ... wear amount calculation unit by minute sliding, 54 ... wear amount correction unit, 55 ... remaining life diagnosis department.

Claims (8)

A method for diagnosing the life of a power switchgear using a computer, comprising:
The computer constitutes an energization circuit for the power switchgear based on device-specific data that is data specific to the power switchgear and operating environment data that is data related to the operating environment of the power switchgear. Determining the number of microslides occurring in the part;
The computer determining the amount of decomposition products mixed into the contact portion based on the device-specific data and interruption information data that is data relating to current interruption by the power switching device;
The computer calculates the amount of wear due to micro-sliding of the contact portion based on the number of micro-sliding times and the amount of degradation products mixed;
The computer includes a step of diagnosing the life of the power switchgear based on the amount of wear. 2. The life diagnosis method for a power switchgear according to claim 1, wherein the computer includes a step of correcting the amount of wear based on history data relating to the power switchgear. The life diagnosis method for a power switchgear according to claim 2, wherein the history data regarding the power switchgear is data regarding a component replacement history. The life diagnosis method for a power switchgear according to claim 2, wherein the history data regarding the power switchgear is data regarding an operation history. Device-specific data storage means for storing device-specific data, which is data specific to the power switching device;
Operating environment data storage means for storing operating environment data which is data relating to the operating environment of the power switchgear;
Interruption information data storage means for storing interruption information data which is data relating to current interruption by the power switchgear;
Based on the device specific data stored in the device specific data storage means and the operation environment data stored in the operation environment data storage means, a minute amount generated at a contact portion constituting an energization circuit of the power switchgear. Means for determining the number of sliding times for determining the number of sliding times;
Decomposition product for determining the amount of decomposition product mixed into the contact portion based on the device specific data stored in the device specific data storage means and the shutoff information data stored in the shutoff information data storage means Mixing amount determination means;
The amount of wear due to micro-sliding of the contact portion based on the number of micro-sliding times determined by the micro-sliding frequency determining unit and the amount of decomposition product contamination determined by the decomposition product mixing amount determining unit Wear amount calculating means for calculating
A life diagnosis system for a power switchgear comprising: life diagnosis means for diagnosing the life of the power switchgear based on the wear amount calculated by the wear amount calculator. History data storage means for storing history data which is history data relating to the power switchgear;
The wear amount correcting means for correcting the wear amount calculated by the wear amount calculating means based on the history data stored in the history data storage means. Life diagnosis system for power switchgear. Computer
Based on device-specific data, which is data specific to the power switchgear, and operating environment data, which is data related to the operating environment of the power switchgear, a minute amount generated at the contact portion constituting the energization circuit of the power switchgear Means for determining the number of sliding times for determining the number of sliding times;
Decomposition product mixing amount determination means for determining the amount of decomposition product mixed into the contact portion based on the device specific data and interruption information data which is data relating to current interruption by the power switching device;
The amount of wear due to micro-sliding of the contact portion based on the number of micro-sliding times determined by the micro-sliding frequency determining unit and the amount of decomposition product contamination determined by the decomposition product mixing amount determining unit Wear amount calculating means for calculating
A life diagnosis program for a power switchgear for causing it to function as a life diagnosis unit for diagnosing the life of the power switchgear based on the wear amount calculated by the wear amount calculator. 8. The computer according to claim 7, wherein the computer is caused to function as a wear amount correction unit that corrects the wear amount calculated by the wear amount calculation unit based on history data that is history data regarding the power switchgear. Life-span diagnosis program for power switchgear.

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