JP7395077B1 - Method, device and program for diagnosing deterioration of electrical equipment including insulators - Google Patents

Abstract

A technique is disclosed that improves the accuracy of diagnosing the deterioration state of insulators in high-voltage electrical equipment. The processing executed by the processor of the deterioration diagnosis device includes a step (S710) of creating a first database (correction coefficient database), a step (S720) of creating a second database (diagnosis database), and a step (S720) of creating a first database (correction coefficient database). A step of acquiring a resistance value (S730), a step of estimating the surface resistivity of the insulation object to be diagnosed (S740), and a step of estimating the surface resistivity of the insulation object and the insulation of a new or unused product made of the same material as the object of diagnosis. a step of creating a deterioration straight line representing the deterioration of the surface resistivity based on the surface resistivity of the object (S750); and a step of calculating the number of years of service life of the object to be diagnosed from the intersection of the deterioration straight line and a predetermined threshold value. (S760), and a step (S770) of subtracting the number of years of use at the time of measurement or the number of years elapsed since installation of the insulation deterioration sensor from the number of years of life to calculate the remaining life of the diagnostic target.

Description

The present disclosure relates to a technique for diagnosing deterioration of an insulator, and more particularly, to a technique for diagnosing deterioration of an insulator used in electrical equipment.

Switchgears, molded transformers, and other high-voltage electrical equipment are equipment that plays a role in supplying electrical energy to factories and buildings, and are required to operate with reliability and stability over a long period of time. Insulators used in high-voltage electrical equipment deteriorate after long-term use. If electrical trouble occurs as a result, the impact on production equipment or buildings will be significant, such as production losses or equipment maintenance. Therefore, there is a need for a technique for accurately diagnosing deterioration of insulators used in high-voltage electrical equipment.

It is believed that the deterioration of insulators used in high-voltage electrical equipment progresses through the following processes. (1) Dust and gases (NOx (nitrogen oxides), SOx (sulfur oxides)) floating in the installation environment of the insulator adhere to the insulator, thereby reducing the surface resistivity of the insulator. Furthermore, the surface resistivity of the insulator also decreases when the humidity is high or the temperature is high. (2) Localized dry zones are formed in the insulator due to Joule heat due to leakage current. (3) Scintillation discharge occurs due to voltage concentration in the dry zone. (4) Due to the discharge, organic matter in the insulator is carbonized to form a conductive path, leading to dielectric breakdown.

In order to prevent electrical problems from occurring due to insulation breakdown, it is necessary to understand the deterioration state of the insulation materials used in high-voltage electrical equipment (insulator surface conditions) and carry out maintenance and renewal in a planned manner. It is necessary to. Therefore, it is important to quantitatively and accurately grasp the degree of deterioration (insulator surface condition) of the insulators used in high-voltage electrical equipment, and to diagnose the deterioration of the high-voltage electrical equipment.

For example, Patent No. 3078723 (Patent Document 1) discloses a technology "related to a measuring method and a measuring device for measuring the amount of contaminants attached to the surface of an outdoor structure such as an insulator that supports electric wires." .

Patent No. 3078723

According to the technique disclosed in Patent Document 1, when measuring the surface condition (amount of contaminants attached) of an insulator, all ions dissolved in an aqueous solvent affect the measured electrical resistance value. Therefore, it is not possible to evaluate the influence of only ion species that affect the deterioration of the insulator, and there is room for further improvement in order to evaluate the deterioration state of the insulator with higher accuracy.

This disclosure has been made in view of the above background, and one aspect of the disclosure is to provide a technique for evaluating the deterioration state of an insulator with higher accuracy. One of the objectives of the other aspect is to provide a technique for diagnosing insulation degradation with high accuracy by considering the influence of only ionic species that affect insulation degradation.

According to certain embodiments, a computer-implemented method for diagnosing deterioration of electrical equipment including insulation is provided. This method is based on the resistance values obtained by applying an electrode to the adhesives attached to insulators with different degrees of deterioration and immersed in an aqueous solvent, and the analysis results of the amount of ions dissolved in the adhesives. a step of accessing a first database having a correction coefficient that takes into consideration the amount of ions that affect the deterioration; and a step of accessing a first database having a correction coefficient that takes into account the amount of ions that affect the deterioration; and for the resistance value obtained in advance, using the correction coefficient obtained from the first database to influence the insulation deterioration. accessing a second database showing the relationship between the converted value calculated by taking into account the amount of ions to be treated and the surface resistivity of the insulating material; a step of applying an electrode to obtain a resistance value; a step of deriving a correction coefficient and a converted value from the first database based on the obtained resistance value; estimating the surface resistivity of the insulator from a second database; and calculating the number of years of use and surface resistivity of the insulator derived from the estimated surface resistivity and the surface resistivity of the insulator before use. and a step of calculating the life span of the insulator to be diagnosed based on the relationship and a predetermined threshold value.

These and other objects, features, aspects and advantages of the present invention will become apparent from the following detailed description of the invention, taken in conjunction with the accompanying drawings.

FIG. 1 is a cross-sectional view schematically showing the configuration of a switchgear that is an example of high-voltage electrical equipment. 1 is a diagram schematically showing a resistance measuring device 200 according to the first embodiment. FIG. It is a figure showing an example of the adhesive body 33 used when measuring resistance according to a certain embodiment. FIG. 4 is a block diagram showing the configuration of a deterioration diagnosis device 400 according to an embodiment. 4 is a block diagram illustrating functions realized by a control unit 430. FIG. 2 is a block diagram showing the hardware configuration of a computer 600 that functions as a resistance measuring device 200. FIG. 3 is a flowchart showing a part of processing executed by CPU 1 of computer 600 functioning as deterioration diagnosis device 400. FIG. FIG. 3 is a diagram plotting measured values and surface resistivities of insulators when the resistance measuring device 200 is used for insulators with different degrees of deterioration. 3 is a diagram showing the relationship between resistance values and correction coefficients when using the resistance measuring device 200. FIG. FIG. 3 is a diagram showing the relationship between a conversion value that takes into account only the amount of ions that affect the deterioration of the insulator and the surface resistivity of the insulator. It is a figure which illustrates the adhesive body 1100 with the mark attached.

Embodiments of the present invention will be described below with reference to the drawings. In the following description, the same parts are given the same reference numerals. Their names and functions are also the same. Therefore, detailed descriptions thereof will not be repeated.

Embodiment 1.
Specifically, the method for diagnosing deterioration of high-voltage electrical equipment is a method for diagnosing deterioration of high-voltage electrical equipment including an insulator. Examples of high-voltage electrical equipment include switch gears, transformers, control gears such as motor control centers, generators, electric motors, and power supply devices for power supply (AC power supplies, DC power supplies, rectifiers), and the like.

High-voltage electrical equipment is comprised of main circuit components such as circuit breakers, disconnectors, transformers, busbars and conductors, and measuring equipment. An example of high-voltage electrical equipment will be described below, but the present invention is not limited to this configuration.

An example of high voltage electrical equipment will be described with reference to FIG. FIG. 1 is a cross-sectional view schematically showing the configuration of a switchgear that is an example of high-voltage electrical equipment. The switchgear 49 includes main circuit components such as a circuit breaker, a disconnector, a bus bar and a conductor supported by an insulator, and a measuring device.

As shown in FIG. 1, the switchgear 49 includes operating mechanisms 51a, 51b, circuit breakers 50a, 50b, insulators 58a, 58b, 58c, 58d, connection conductors 53a, 54a, 53b, 54b, and bus bar supports. plate 56. The circuit breakers 50a and 50b each include molded frames 55a and 55b. The connection conductors 53a, 54a, 53b, 54b are supported by insulators 58a, 58b, 58c, 58d, respectively. The busbar support plate 56 collectively supports three horizontal busbars 52 corresponding to each phase of three-phase alternating current.

The mold frame 55a incorporates the operating mechanism 51a of the circuit breaker 50 and the interrupting part (not shown), and is mounted on the trolley 61a. The trolley 61a is arranged so as to be movable in both directions indicated by an arrow 100.

One end of the upper connection conductor 53a is electrically connected to the cable 57a. The other end of the connection conductor 53a is electrically connected to the upper terminal of the circuit breaker 50a.

One end of the lower connecting conductor 54a is electrically connected to the lower terminal of the circuit breaker 50a. The other end of the connection conductor 54a is electrically connected to one end of the lower connection conductor 53b via a horizontal busbar supported by a busbar support plate 56. The other end of the connection conductor 53b is electrically connected to the upper terminal of the circuit breaker 50b.

One end of the lower connecting conductor 54b is electrically connected to the lower terminal of the circuit breaker 50b. The other end of the connecting conductor 54b is electrically connected to the cable 57b.

The materials of the insulators targeted for deterioration diagnosis in this embodiment, that is, the mold frames 55a and 55b, the bus bar support plate 56, or the insulator 58, are, for example, polyester resin, epoxy resin, phenol resin, etc., but are not limited to these. I can't do it.

<Resistance measuring device>
The resistance measuring device will be described with reference to FIG. 2. FIG. 2 is a diagram schematically showing a resistance measuring device 200 according to the first embodiment.

As shown in FIG. 2, the resistance measuring device 200 includes a resistance meter 35, a probe 31, and an electrode 32. The probe 31 is connected to a resistance meter 35. The electrode 32 is attached to the tip of the probe 31.

The adhesive body 33 immersed in an aqueous solvent is attached to an insulator 34 to be diagnosed. The probe 31 is pressed against the adhesive body 33. When the electrode 32 comes into contact with the adhesive body 33, the resistance meter 35 measures the resistance value of the insulator 34 to be diagnosed.

Although FIG. 2 illustrates an embodiment in which the resistance meter 35 and the probe 31 are separated, the configuration of the resistance measuring device 200 is not limited to the configuration illustrated in FIG. 2. In other aspects, the resistance meter 35 and the probe 31 may be configured in one piece.

Further, in this embodiment, the electrode 32 is exemplified as a four-terminal electrode 332 in order to eliminate the influence of contact resistance, but the configuration of the electrode 32 is not limited to that illustrated in FIG. 2.

Further, since the electrode 32 is pressed against the adhesive body 33 with a constant pressure, the shape of the electrode 32 may be an electrode pin shape having an arbitrary spring pressure, but the shape of the electrode 32 is not limited to this. A configuration may also be adopted.

<Adhesive body>
The adhesive body will be described with reference to FIG. 3. FIG. 3 is a diagram showing an example of an adhesive body 33 used when measuring resistance according to an embodiment.

The adhesive body 33 is made of a material that can absorb liquid such as water. A typical adhesive body 33 is, for example, filter paper (cellulose), but the adhesive body 33 is not limited to filter paper. Any material that can absorb water or other liquids may be used. Furthermore, as the aqueous solvent in which the adhesive body 33 is immersed, in addition to water, alcohol or other organic solvents, or a solvent in which water and an organic solvent are mixed may be used.

<Deterioration diagnosis device>
The configuration of the deterioration diagnosis device will be described with reference to FIG. 4. FIG. 4 is a block diagram showing the configuration of a deterioration diagnosis device 400 according to an embodiment.

The deterioration diagnosis device 400 is realized in the form of a control board whose operation is controlled by a program recorded on a recording medium such as a ROM (Read-Only Memory). Note that the control board is an example of implementing a deterioration diagnosis device, and the hardware configuration of the deterioration diagnosis device is not particularly limited. A deterioration diagnosis device 400 according to a certain aspect includes an input section 410, a storage section 420, a control section 430, and an output section 440.

Input unit 410 is realized by, for example, an input device such as a keyboard and mouse, or a tablet. The input unit 410 receives input of various data necessary for deterioration diagnosis of the diagnosis target 55 (for example, the mold frame 55a), and sends the input data to the storage unit 102. The input data includes, for example, the resistance value obtained by pressing the probe 31 against the adhesive body 33 and the surface resistivity of the polyester insulator. These data are input to the deterioration diagnosis device 400 prior to deterioration diagnosis. Further, a predetermined voltage (for example, 100 V) is applied by the resistance meter 35, and the output value from the probe 31 is measured by the resistance meter 35. The measured value sent from the resistance meter 35 is input to the input section 410.

The storage unit 420 holds a program for performing a deterioration diagnosis, data regarding an insulation deterioration sensor for calculating surface resistivity from measured values, and other data. Furthermore, the storage unit 420 stores various data input to the input unit 410. The storage unit 420 is realized as a memory device using, for example, a ROM, a RAM (Random Access Memory), a hard disk, or the like.

In one aspect, the storage unit 420 holds a first database 421 and a second database 422. The first database 421 is a database of correction coefficients. The second database 422 is a diagnostic database.

The control unit 430 is realized by, for example, a microprocessor (MPU), a CPU, or other arithmetic processing device. The control unit 430 reads the program stored in the storage unit 420 and executes processing for diagnosing deterioration of the insulator according to the procedure described in the program.

The output unit 440 outputs the results of the processing executed by the control unit 430. The output destination is a monitor built into the deterioration diagnosis device 400, an output device 470 connected to the deterioration diagnosis device 400, or an information processing device (not shown) connected via a communication line.

The output device 470 outputs the diagnosis result by the deterioration diagnosis device 400. The output device 470 may be, for example, a monitor connected to the deterioration diagnosis device 400, a monitor located at a monitoring device or other remote location, a wireless device, or a printer.

In addition, in the illustration of FIG. 4, the probe 31, the resistance meter 35, and the deterioration diagnostic device 400 are connected to each other in a separated state. However, the probe 31, the resistance meter 35, and the deterioration diagnosis device 400 may be configured as an integrated type. That is, the deterioration diagnosis device 400 and the resistance measurement device 200 may be configured as one device.

<Control unit>
The control unit 430 will be further described with reference to FIG. 5. FIG. 5 is a block diagram illustrating the functions realized by the control unit 430. The control unit 430 includes an estimation unit 510, a relational expression creation unit 520, a lifespan calculation unit 530, and a remaining lifespan calculation unit 540.

The estimating unit 510 compares the resistance value obtained by the resistance measuring device 200 with the first database 421 and the second database 422 acquired in advance, and estimates the surface resistivity of the insulating object to be diagnosed 55.

The relational expression creation unit 520 connects the surface resistivity of the diagnostic target 55 and the surface resistivity of the target insulator that has been used for 0 years (new or unused), and creates a straight line that represents the relationship between the number of years of use and the surface resistivity. (hereinafter also referred to as "deterioration line").

The lifespan calculation unit 530 calculates the number of years specified by the intersection of the deterioration straight line created by the relational expression creation unit 73 and a predetermined threshold value as the lifespan of the diagnosis target 55 .

The remaining life years calculation section 540 subtracts the number of years that have passed from the life years calculated by the life years calculation section 530 to calculate the remaining life of the high voltage electrical equipment (switch gear 49). For example, the remaining life years calculation unit 540 calculates the remaining life of the high voltage electrical equipment by subtracting the number of years of use of the high voltage electrical equipment at the time of measurement of the resistance value from the number of years of life. Alternatively, the remaining life years calculation unit 540 calculates the remaining life of the high voltage electrical equipment by subtracting the number of years of use of the high voltage electrical equipment when the insulation deterioration sensor was installed from the number of years of life.

<Hardware configuration>
A specific configuration of the resistance measuring device 200 will be described with reference to FIG. 6. FIG. 6 is a block diagram showing the hardware configuration of a computer 600 that functions as the resistance measuring device 200.

The computer 600 has, as its main components, a CPU (Central Processing Unit) 1 that executes programs, a mouse 2 and a keyboard 3 that receive instructions from the user of the computer 600, and data generated by the execution of programs by the CPU 1. , or a RAM 4 that volatilely stores data input via the mouse 2 or keyboard 3, a hard disk 5 that stores data nonvolatilely, an optical disk drive 6, and a communication interface (I/F) 7. monitor 8. Each component is connected to each other by a data bus. The optical disc drive device 6 is loaded with a CD-ROM (Compact Disc - Read Only Memory) 9 and other optical discs.

Processing in the computer 600 is realized by each piece of hardware and software executed by the CPU 1. Such software may be stored in the hard disk 5 in advance. Further, the software may be stored on a CD-ROM 9 or other recording medium and distributed as a computer program. Alternatively, the software may be provided as a downloadable application program by an information provider connected to the Internet. Such software is read from the recording medium by the optical disk drive device 6 or other reading device, or is downloaded via the communication interface 7, and then temporarily stored in the hard disk 5. The software is read from the hard disk 5 by the CPU 1 and stored in the RAM 4 in the form of an executable program. CPU1 executes the program.

Each component constituting the computer 600 shown in FIG. 6 is common. Therefore, it can be said that one of the essential parts of the technical idea according to the present disclosure is software stored in the RAM 4, hard disk 5, CD-ROM 9, and other recording media, or software that can be downloaded via a network. The storage medium may include a non-transitory, computer-readable data storage medium. Since the operation of each piece of hardware in computer 600 is well known, detailed description will not be repeated.

The recording medium is not limited to CD-ROM, FD (Flexible Disk), hard disk, but also SSD (Solid State Drive), magnetic tape, optical disk (MO (Magnetic Optical Disc) / MD (Mini Disc) / DVD (Digital Versatile Disc)). )), IC (Integrated Circuit) cards (including memory cards), optical cards, mask ROM, EPROM (Electronically Programmable Read-Only Memory), EEPROM (Electronically Erasable Programmable Read-Only Memory), semiconductor memories such as flash ROM, etc. It may also be a medium that permanently carries a program.

The program here includes not only programs that can be directly executed by the CPU, but also programs in source program format, compressed programs, encrypted programs, and the like.

Although the CPU 1 shown in FIG. 6 can function as the control unit 430, other processors can also function as the control unit 430. The other processor may also be called, for example, a processing device, an arithmetic device, a microprocessor, a microcomputer, or a DSP (Digital Signal Processor).

In other aspects, a dedicated processing circuit may constitute the resistance measuring device 200 instead of the CPU 1. The dedicated processing circuit may be realized by, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a combination thereof. be done.

<Control structure>
The control structure of the deterioration diagnosis device 400 will be described with reference to FIG. 7. FIG. 7 is a flowchart showing part of the processing executed by the CPU 1 of the computer 600 functioning as the deterioration diagnosis device 400.

In step S710, the CPU 1 creates a correction coefficient database as the first database 421. More specifically, the CPU 1 calculates the resistance value obtained by pressing the electrode 32 against the adhesive body 33 immersed in an aqueous solvent and the resistance value of the adhesive body 33 at that time for insulators with different degrees of deterioration. A correction coefficient that takes into account the amount of dissolved ions that affect insulation deterioration is obtained in advance. At this time, a method for calculating a correction coefficient that takes into account the amount of ions that affect insulation deterioration is, for example, a method that divides the amount of ions that affect insulation deterioration (nitric acid, sulfate ions) by the total ions. The method is not necessarily limited to this method.

In step S720, the CPU 1 creates a diagnostic database as the second database. More specifically, the CPU 1 refers to the first database for the resistance value obtained in advance, and uses the obtained correction coefficient to calculate a value (converted value) that takes into account the amount of ions that affect insulation deterioration. Then, the relationship between the converted value and the surface resistivity of the insulator is obtained in advance. As a method for calculating the converted value, for example, a method of dividing the measured value by a correction coefficient is used, but the method is not limited to this method, and other methods may be adopted.

In step S730, the CPU 1 controls the resistance measuring device 200 to obtain the resistance value of the insulating object to be diagnosed 55. More specifically, the resistance measuring device 200 presses the electrode 32 against the adhesive body 33 immersed in an aqueous solvent with respect to the insulating object 55 to be diagnosed, and obtains the resistance value of the object 55 to be diagnosed. The resistance value is input into computer 600.

In step S740, the CPU 1, as the estimator 510, estimates the surface resistivity of the insulating object to be diagnosed 55. More specifically, the CPU 1 compares the resistance value of the diagnostic target 55 acquired in step S730 with the first database 421. The CPU 1 calculates a correction coefficient and a conversion value. Further, the CPU 1 estimates the surface resistivity of the diagnostic target 55 by comparing the obtained converted value with the second database 422.

In step S750, the CPU 1, as the relational expression creation unit 520, based on the surface resistivity estimated in step S740 and the surface resistivity of a new or unused insulator made of the same material as the diagnosis target 55. Then, a deterioration straight line representing the deterioration of the surface resistivity is created.

In step S760, the CPU 1, as the lifespan calculation unit 530, calculates the lifespan of the diagnosis target 55 from the intersection of the deterioration straight line obtained in step S750 and a predetermined threshold value. Note that the threshold value is the surface resistivity when discharge occurs in the insulator.

In step S770, the CPU 1, as the remaining life years calculation unit 540, subtracts the number of years of use at the time of measurement from the number of years of life calculated in step S760, or subtracts the number of years that have passed since the installation of the insulation deterioration sensor. By doing so, the remaining life of the diagnostic target 55 is calculated.

<Relationship between resistance value and surface resistivity>
The relationship between resistance value and surface resistivity will be described with reference to FIG. 8. FIG. 8 is a diagram plotting measured values and surface resistivities of the insulators when the resistance measuring device 200 is used for insulators with different degrees of deterioration.

As shown in FIG. 8, the initial amount of attached ions is not related to the surface resistivity of the insulator, but the measured value using the resistance measuring device 200 includes the influence of the initial amount of attached ions. Therefore, in a region where the surface resistivity of the insulator is high (that is, the degree of contamination is low), the measured value is more influenced by ions attached to an unused product (new product). As a result, as is clear from the data included in region 800, the resistance value and surface resistivity in this region are no longer correlated. That is, if the raw data obtained without correcting the measured value is used as it is, the resistance value and the surface resistivity are out of correlation.

FIG. 9 is a diagram showing the relationship between the resistance value and the correction coefficient when using the resistance measuring device 200. The correction coefficient is expressed as, for example, the amount of ions that affect insulation deterioration/total amount of ions. The relationship shown in FIG. 9 is between the resistance value measured using the resistance measuring device 200 and the resistance value pasted on the insulator with different degrees of deterioration, which is used for deterioration diagnosis of high-voltage electrical equipment. The first database 421 (correction coefficient database) is conceptually represented by obtaining in advance a correction coefficient that takes into account the amount of ions that affect insulation deterioration dissolved in the attached adhesive body.

The CPU 1 considers the resistance values measured using the resistance measuring device 200 for insulators with different degrees of deterioration, and the amount of ions dissolved in the adhesive body 33 during the measurement that affect insulation deterioration. Upon receiving the input correction coefficients, these data are configured as a first database 421 (correction coefficient database). Based on the calculated correction coefficient, the CPU 1 can calculate a conversion value for the measured value that takes into account only the amount of ions that affect the deterioration of the insulator.

FIG. 10 is a diagram showing the relationship between a conversion value that takes into account only the amount of ions that affect the deterioration of the insulator and the surface resistivity of the insulator. This relationship corresponds to the second database 422 (diagnostic database). The conversion value is calculated by considering the amount of ions that affect insulation deterioration using a correction coefficient obtained by referring to the first database 421 for resistance values previously obtained (measured) from insulators with different degrees of deterioration. This is the value calculated by For example, the converted value is derived from the following equation.
Conversion value = measured value / correction coefficient By using the first database 421 and the second database 422, the CPU 1 calculates the amount of ions that affect insulation deterioration without being affected by the amount of ions attached to the insulator at the initial stage. The diagnosis target 55 can be diagnosed by considering only the following. More specifically, the CPU 1 compares the measured value obtained using the resistance measuring device 200 with the first database 421 for the insulating object to be diagnosed 55, and calculates the correction coefficient. Based on the measured value and the correction coefficient, the CPU 1 uses a conversion formula (conversion value=measured value/correction coefficient) to calculate a conversion value that takes into account only the amount of ions that affect insulation deterioration.

The CPU 1 compares the calculated conversion value with the second database 422 (diagnosis database) as shown in FIG. It is possible to estimate the rate with high accuracy.

Embodiment 2.
Embodiment 2 of the present invention will be described below. In the first embodiment, a method in which the adhesive body 33 is immersed in an aqueous solvent is exemplified. The solvent used is not limited to an aqueous solvent, and for example, an organic solvent or a mixture of water and an organic solvent may be used. By using an organic solvent, it is possible to take into account the influence of deposits that are not soluble in water but affect insulation deterioration, making it possible to diagnose deterioration with higher accuracy.

Note that the resistance measuring device and deterioration diagnosing device according to this embodiment have the same hardware configuration as that of the resistance measuring device 200 and deterioration diagnosing device 400 according to the above-described embodiments. The functions of the hardware configuration are also the same. Therefore, the description of the hardware configuration will not be repeated.

Embodiment 3.
Embodiment 3 of the present invention will be described using FIG. 11. The adhesive body 33 used in the embodiment described above does not have markings. In other aspects, the adhesive body 33 may have a mark. Note that the resistance measuring device and deterioration diagnosing device according to this embodiment have the same hardware configuration as that of the resistance measuring device 200 and deterioration diagnosing device 400 according to the above-described embodiments. The functions of the hardware configuration are also the same. Therefore, the description of the hardware configuration will not be repeated.

FIG. 11 is a diagram illustrating an adhesive body 1100 with marks attached. The adhesive body 1100 has marks 1101, 1102, 1103, and 1104.

Marks 1101, 1102, 1103, and 1104 correspond to the shapes of the electrodes 32. Marks 1101, 1102, 1103, and 1104 are printed on the adhesive body 1100 in advance. If the position where the electrode 32 contacts the adhesive body 33 shifts, the electric field between the electrodes will also change, which may affect the resistance value.

Therefore, the adhesive body 1100 according to this embodiment has marks 1101, 1102, 1103, and 1104 corresponding to the shapes of the electrodes 32 to be contacted. Since the marks 1101, 1102, 1103, and 1104 can prevent displacement of the positions where the electrodes 32 contact, the influence of changes in resistance value due to the displacement of the positions is eliminated. Thereby, variations in measured values can be reduced.

As mentioned above, although a plurality of embodiments have been illustrated, these are merely examples and are not intended to limit the scope of the present invention.

In the description of the first to third embodiments above, the switchgear 49 was exemplified as the high-voltage electrical equipment. However, the application of the technical idea embodied in the above embodiment is not limited to the switchgear 49. This technical concept applies to all electrical equipment that uses insulators to insulate current-carrying parts from ground to ground or between phases, and where the deterioration of the insulation performance of the insulators is diagnosed. Effects similar to those obtained by Embodiments 1 to 3 are achieved.

As described in detail above, in the disclosed technique, an adhesive body immersed in an aqueous solvent is attached to the surface of an insulating material to be diagnosed. An electrode is pressed against the adhesive and the resistance value is measured. The deterioration diagnosis device 400 calculates a resistance value ( (converted value). The deterioration diagnosis device 400 estimates the surface resistivity of the insulator with reference to the second database 422 that summarizes the relationship between the converted value and the surface resistivity of the insulator. The deterioration diagnosis device 400 identifies the intersection of a straight line of surface resistivity of a new or unused insulator and a predetermined threshold value, and calculates the number of years of life and the number of years of remaining life from the intersection.

On the other hand, according to the method described in Patent Document 1, when the degree of deterioration of the insulator is small (for example, the insulator is unused or almost new), the filler contained in the insulator is Dissolves calcium carbonate and aluminum hydroxide. Although these ions do not affect the deterioration of the insulator, according to the method described in Patent Document 1, the ions dissolve in the patch. Therefore, the value (resistance value) obtained by measuring the insulator is affected by the dissolved ions, and therefore the state of deterioration of the insulator cannot be evaluated with high precision.

On the other hand, according to each of the above-described embodiments, the deterioration diagnosis device 400 uses the first database 421 that takes into account only the influence of the electrode measurement values of insulators with different degrees of deterioration and the amount of ions that affect insulation deterioration obtained in advance. Correct the resistance value using Therefore, since the deterioration diagnosis device 400 can take into account the influence of ion species that contribute to the deterioration of the insulator, it is possible to diagnose the deterioration state of the insulator with higher accuracy.

The embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims rather than the above description, and it is intended that equivalent meanings and all changes within the scope of the claims are included.

1 CPU, 2 Mouse, 3 Keyboard, 4 RAM, 5 Hard disk, 6 Optical disk drive, 7 Communication interface, 8 Monitor, 9 ROM, 31 Probe, 32 Electrode, 33,1100 Adhesive, 34 Insulator to be diagnosed, 35 Resistance meter, 49 Switch gear, 50a, 50b Circuit breaker, 51a, 51b Operating mechanism, 52 Horizontal busbar, 53a, 53b, 54a, 54b Connection conductor, 55 Diagnosis target, 55a, 55b Mold frame, 56 Busbar support plate, 57a, 57b cable, 58, 58a, 58b, 58c, 58d insulator, 61a trolley, 73, 520 relational expression creation section, 100 arrow, 102, 420 storage section, 200 resistance measuring device, 400 deterioration diagnosis device, 410 input section, 421 No. 1 database, 422 second database, 430 control unit, 440 output unit, 470 output device, 510 estimation unit, 530, 540 lifespan calculation unit, 600 computer, 800 area, 1101, 1102, 1103, 1104 mark.

Claims (20)

A method for diagnosing deterioration of electrical equipment including insulators, the method comprising:
The resistance values obtained by applying electrodes to the adhesives attached to insulators with different degrees of deterioration and immersed in an aqueous solvent, and the analysis results of the amount of ions dissolved in the adhesives, determine the influence on insulation deterioration. accessing a first database having a correction coefficient in which the amount of ions is taken into account;
For the resistance value obtained in advance, a first database showing the relationship between the conversion value calculated using the correction coefficient obtained from the first database and taking into account the amount of ions that affect insulation deterioration and the surface resistivity of the insulator. 2 accessing the database;
A step of applying an electrode to an adhesive body immersed in an aqueous solvent to obtain a resistance value of an insulator to be diagnosed;
Deriving a correction coefficient and a conversion value from the first database based on the obtained resistance value;
estimating the surface resistivity of the insulator from the second database based on the derived converted value;
The diagnosis target is determined based on the relationship between the age of use of the insulator and the surface resistivity, which is derived from the estimated surface resistivity and the surface resistivity of the insulator before use, and a predetermined threshold value. and calculating the life span of an insulator. 2. The method according to claim 1, wherein the relationship between the age of use and surface resistivity is represented by a straight line connecting the estimated surface resistivity and the surface resistivity of the insulator before use. 3. The method according to claim 1, further comprising the step of calculating the remaining life of the insulator to be diagnosed by subtracting the number of years of use of the insulator to be diagnosed from the number of years of service life. 3. The method according to claim 1 , wherein the solvent in which the adhesive body is immersed includes an aqueous solvent, an organic solvent, or a mixture of the aqueous solvent and the organic solvent. 3. The method according to claim 1 , wherein a mark corresponding to the shape of the electrode is formed on the adhesive body. 3. The method according to claim 1, wherein the step of acquiring the resistance value includes the step of applying the electrode to a predetermined position on the adhesive body depending on the position of the electrode. 3. The method according to claim 1 , wherein the electrical equipment includes any one of a power receiving and distribution device, a transformer, a control gear, a generator, an electric motor, and a power supply device for power supply. A device for diagnosing deterioration of electrical equipment including insulators,
a storage device;
a processor electrically connected to the storage device,
The storage device is
The resistance values obtained by applying electrodes to the adhesives attached to insulators with different degrees of deterioration and immersed in an aqueous solvent, and the analysis results of the amount of ions dissolved in the adhesives, determine the influence on insulation deterioration. a first database having a correction coefficient that takes into account the amount of ions;
For the resistance value obtained in advance, a first database showing the relationship between the conversion value calculated using the correction coefficient obtained from the first database and taking into account the amount of ions that affect insulation deterioration and the surface resistivity of the insulator. 2 databases are stored.
The processor includes:
For the insulator to be diagnosed, the resistance value is obtained by applying an electrode to the adhesive that is immersed in an aqueous solvent.
Deriving a correction coefficient and a conversion value from the first database based on the obtained resistance value,
Estimating the surface resistivity of the insulator from the second database based on the derived converted value,
The diagnosis target is determined based on the relationship between the age of use of the insulator and the surface resistivity, which is derived from the estimated surface resistivity and the surface resistivity of the insulator before use, and a predetermined threshold value. A device that calculates the lifespan of insulators. 9. The device according to claim 8, wherein the relationship between the age of use and surface resistivity is represented by a straight line connecting the estimated surface resistivity and the surface resistivity of the insulator before use. The apparatus according to claim 8 or 9, wherein the processor calculates the remaining life of the insulator to be diagnosed by subtracting the number of years of use of the insulator to be diagnosed from the number of years of service life. The apparatus according to claim 8 or 9 , wherein the solvent in which the adhesive body is immersed includes an aqueous solvent, an organic solvent, or a mixture of the aqueous solvent and the organic solvent. The device according to claim 8 or 9 , wherein a mark corresponding to the shape of the electrode is formed on the adhesive body. The apparatus according to claim 8 or 9 , wherein acquiring the resistance value includes applying the electrode to a predetermined position on the adhesive body depending on the position of the electrode. The device according to claim 8 or 9 , wherein the electrical equipment includes any one of a power receiving and distribution device, a transformer, a control gear, a generator, an electric motor, and a power supply device for power supply. A program including instructions for causing a processor of a computer to execute a method for diagnosing deterioration of electrical equipment including insulators, the program causing the processor to:
The resistance values obtained by applying electrodes to the adhesives attached to insulators with different degrees of deterioration and immersed in an aqueous solvent, and the analysis results of the amount of ions dissolved in the adhesives, determine the influence on insulation deterioration. accessing a first database having a correction coefficient in which the amount of ions is taken into account;
For the resistance value obtained in advance, a first database showing the relationship between the conversion value calculated using the correction coefficient obtained from the first database and taking into account the amount of ions that affect insulation deterioration and the surface resistivity of the insulator. 2 accessing the database;
a step of accepting an input of a resistance value obtained by applying an electrode to an adhesive body immersed in an aqueous solvent for an insulator to be diagnosed;
Deriving a correction coefficient and a conversion value from the first database based on the obtained resistance value;
estimating the surface resistivity of the insulator from the second database based on the derived converted value;
The diagnosis target is determined based on the relationship between the age of use of the insulator and the surface resistivity, which is derived from the estimated surface resistivity and the surface resistivity of the insulator before use, and a predetermined threshold value. A program that executes steps to calculate the lifespan of an insulator. 16. The program according to claim 15, wherein the relationship between the number of years of use and the surface resistivity is represented by a straight line connecting the estimated surface resistivity and the surface resistivity of the insulator before use. 17. The program further causes the computer to calculate the remaining life of the insulator to be diagnosed by subtracting the number of years of use of the insulator to be diagnosed from the number of years of service life of the insulator to be diagnosed. program. 17. The program according to claim 15, wherein the solvent in which the adhesive body is immersed includes an aqueous solvent, an organic solvent, or a mixture of the aqueous solvent and the organic solvent. The program according to claim 15 or 16 , wherein a mark corresponding to the shape of the electrode is formed on the adhesive body. The program according to claim 15 or 16 , wherein the resistance value is a resistance value obtained by applying the electrode to a predetermined position on the adhesive body depending on the position of the electrode.

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