WO2017141793A1 - Procédé de diagnostic et système de diagnostic pour appareil électrique équipé d'un moule en résine pour l'isolation électrique - Google Patents

Procédé de diagnostic et système de diagnostic pour appareil électrique équipé d'un moule en résine pour l'isolation électrique Download PDF

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Publication number
WO2017141793A1
WO2017141793A1 PCT/JP2017/004619 JP2017004619W WO2017141793A1 WO 2017141793 A1 WO2017141793 A1 WO 2017141793A1 JP 2017004619 W JP2017004619 W JP 2017004619W WO 2017141793 A1 WO2017141793 A1 WO 2017141793A1
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Prior art keywords
resin mold
stress
electrical
electrical insulation
insulation
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PCT/JP2017/004619
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English (en)
Japanese (ja)
Inventor
拓 小野寺
美稀 山崎
竹内　正樹
天兒　洋一
憲一 相馬
浩司 三本
雄大 平野
Original Assignee
株式会社日立産機システム
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Priority claimed from JP2016027723A external-priority patent/JP6668101B2/ja
Priority claimed from JP2016029472A external-priority patent/JP6670629B2/ja
Application filed by 株式会社日立産機システム filed Critical 株式会社日立産機システム
Publication of WO2017141793A1 publication Critical patent/WO2017141793A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N19/00—Investigating materials by mechanical methods

Definitions

  • This invention relates to the diagnostic technique of the electric equipment provided with the resin mold for electrical insulation.
  • electrical devices such as transformers, switches, motors, and inverters are provided with a current-carrying part such as a coil and an electrically insulating resin mold surrounding it.
  • a resin mold By forming a resin mold, it is possible to prevent equipment failure due to electric leakage, prevent electric leakage to the surrounding area where electrical equipment is installed, and ensure safety.
  • this resin mold is mainly composed of a resin material such as an epoxy resin. Furthermore, a coloring agent and an inorganic filler may be mix
  • thermal stress is applied to the interface between the energized part such as a coil and the resin mold. This is a heat stress caused by environmental temperature differences, such as heat generation resulting from continuous energization of a current-carrying portion made of a metal material and a large temperature difference between day and night in the day.
  • the interface is peeled off or the resin mold is cracked, resulting in dielectric breakdown, and electrical insulation by the resin mold cannot be guaranteed. As a result of failure.
  • the metal energized portion is not damaged, and the portion that determines the failure of the electric device is a resin mold.
  • diagnosis of electrical equipment has been performed by measuring the deterioration state of an insulator such as a resin mold.
  • the deterioration state of the insulator has been measured by measurement by a general test, measurement by partial discharge, measurement by optical diagnosis, and the like.
  • a general test measure the insulation resistance and dielectric loss of the insulator.
  • partial discharge the amount of discharge charge per insulator is measured.
  • optical diagnosis the reflectance of light is measured for the insulator.
  • Patent Document 1 is an example of a diagnostic method for electrical equipment using such a conventional technique.
  • optical diagnosis is employed. This is to obtain the reflectance spectrum of the resin material that has been thermally deteriorated in advance, two types of single wavelength light that matches the wavelength of the reflection peak of the colorant and the inorganic filler is incident on the resin mold to be diagnosed, It is intended to determine the degree of chemical deterioration of the resin mold to be diagnosed by collating with the reflectance spectrum obtained in advance.
  • the diagnostic method for an electric device described in Patent Document 1 is based on a chemical degradation measurement outside the visible resin mold, and peeling of the interface between the energized part and the resin mold touched above or cracking of the resin mold The establishment of a more accurate diagnostic method is desired.
  • peeling of the interface between the current-carrying site inside the electrical equipment and the resin mold and cracking of the resin mold are due to repeated thermal stress that is naturally applied during the operation of the electrical equipment.
  • the present invention has been made in view of such circumstances, and by quantifying the stress applied to the resin mold at the interface between the energized portion inside the electric device and the resin mold, a highly accurate diagnosis method for the electric device and It is an object to provide a diagnostic system.
  • an electrical equipment diagnosis system including an electrically insulating resin mold, the measuring means for measuring the electrically insulating resin mold;
  • the control means and the display means the measuring means measures the stress applied to the surface layer part of the resin mold for electrical insulation, and the control part performs electrical measurement based on the measured stress applied to the surface layer part. It is converted into stress applied to the interface between the insulating resin mold and the conductive material covered by the electrical insulating resin mold, and the equivalent age of the resin mold for electrical insulation is specified based on the stress applied to the interface.
  • the display means is a diagnostic system for an electrical device that displays the converted equivalent elapsed years.
  • the present invention it is possible to provide a highly accurate diagnosis method and diagnosis system for an electric device based on the stress applied to the resin mold at the interface between the energized portion inside the electric device and the resin mold.
  • FIG. 1 is a flowchart showing in a stepwise manner a diagnostic method for an electrical device including an electrically insulating resin mold according to an embodiment of the present invention.
  • the diagnostic method for an electrical device including the resin mold for electrical insulation includes a first step relating to diagnosis (measurement of stress applied to a surface layer portion of the resin mold), a second Step (Conversion of stress applied to the surface part of the resin mold into stress at the interface with the current-carrying part), and third step (Conversion of stress at the interface with the current-carrying part of the resin mold to equivalent elapsed years) Including.
  • test piece 12 of the resin mold material with which an electric equipment is equipped may be the test piece cut out directly from the electric equipment 11 which actually operate
  • the flow from 11A to 11C shown in FIG. 1 relates to numerical analysis of the electrical equipment 11 by the finite element method, and is performed before actually diagnosing the electrical equipment, and the result is stored in the database.
  • finite element modeling is performed based on the component structure of the electrical device.
  • the material properties of the material that actually configures each part of the electrical device 11, such as a current-carrying part or a resin mold are input.
  • the material physical properties are mechanical physical properties such as Young's modulus and Poisson's ratio, and thermal physical properties such as linear expansion coefficient and thermal conductivity.
  • the thermal stress analysis of the electrical device 11 is performed using the model created in the electrical device modeling 11A.
  • the current value is obtained from Ohm's law using the electrical resistance and voltage at the energization site in the model, and then the heat is generated from Joule's law. Find the amount.
  • ⁇ A thermal stress analysis is performed in consideration of the heat generation at the energized part.
  • the electrical resistance and voltage can be calculated from the total length of the windings constituting the coil and the cross-sectional area of the windings.
  • the thermal stress analysis 11B the distribution of stress applied to the resin mold included in the electrical device 11 can be found.
  • the obtained stress value includes the residual stress resulting from the shape of the resin mold in addition to the thermal stress generated when the heat generated at the energized portion is transferred to the resin mold.
  • the stress distribution is a value of stress at each position from the interface portion 23 between the energized portion 21 and the resin mold 22 for electrical insulation to the surface layer portion 24 of the resin mold. means.
  • FIG. 2 is a schematic diagram of the stress distribution, and the stress S1 applied to the interface 23 and the stress S2 applied to the surface layer 24 are extracted from the distribution.
  • the stress S ⁇ b> 2 applied to the surface layer portion 24 is smaller than the stress S ⁇ b> 1 applied to the interface portion 23, but the stress S ⁇ b> 2 applied to the surface layer portion 24 may be greater than the stress S ⁇ b> 1 applied to the interface portion 23. It doesn't matter if they are equal.
  • the ratio of the stress S ⁇ b> 1 and the stress S ⁇ b> 2 obtained from the thermal stress analysis that is, the value of S ⁇ b> 1 / S ⁇ b> 2 is created as a database.
  • the thermal stress analysis is performed on the electrical device 11 having various dimensions, output, and energized state. Therefore, the stress ratio obtained from the thermal stress analysis is functionalized according to the size, output, usage environment, energized state, etc. of the electrical equipment 11 when creating a database.
  • the usage environment includes information such as the temperature, humidity, and air pollution level of the place where the electric device 11 is operated, and the energized state refers to the average energization time per year and the current peak value in one day. It includes information such as the hold time and what percentage of the maximum output of the electrical equipment is used.
  • the flow from 12A to 12B is also performed before actually diagnosing the electric device, and the result is stored in the database.
  • the flow from 12A to 12B relates to a fatigue life test for the test piece 12 of the resin mold material included in the electric device.
  • a fatigue life test is performed on the test piece 12 of the resin mold material included in the electrical equipment.
  • the fatigue life test is performed by processing a test piece 12 of a resin mold material included in an electrical device into, for example, a strip shape or a dumbbell shape, fixing one end of the processed test piece, and applying a tensile load to the other end. Done.
  • the size of the test piece may be in accordance with, for example, JIS K 7139 standard.
  • the tensile load is repeatedly applied, and the repetition frequency and the maximum value of the load are arbitrary. When a repeated tensile load is applied, the test piece breaks at a certain number of repetitions.
  • a fatigue life curve can be obtained by performing such a test several times while changing the maximum value of the tensile load, and plotting the number of repetitions leading to fracture on the horizontal axis and the maximum value of the tensile load on the vertical axis. .
  • the fatigue life curve obtained as a result of the fatigue life test has a stress value when a logarithmic scale is used for the number of repetitions leading to the fracture on the horizontal axis in accordance with empirical formulas such as the exponential Basquin rule and Coffin-Manson rule. It becomes a decreasing curve.
  • this material fatigue constant is databased as a numerical value unique to the test piece 12 of the resin mold material provided in the electric equipment.
  • the fatigue life test can be performed on the test piece 12 of the resin mold material provided in the electric apparatus having various material compositions. Therefore, the material fatigue constant obtained from the fatigue life test is functionalized according to the material composition of the test piece 12 of the resin mold material included in the electric device when the database is created.
  • the material composition means the types of resin main agent, curing agent, coloring agent, reinforcing agent, and the like and the mixing ratio thereof that constitute the test piece 12 of the resin mold material provided in the electric equipment.
  • the preparation for diagnosing the electrical device 11 is completed by the flow from 11A to 11C and the flow from 12A to 12B shown in FIG. From here, three diagnostic steps will be described.
  • the stress S2 applied to the surface layer portion 24 of the resin mold for electrical insulation provided in the electrical device 11 is measured.
  • the stress is measured by a nondestructive inspection method.
  • the electrical device 11 may be in an energized load state or in a power failure state.
  • the obtained stress value includes the residual stress caused by the shape of the resin mold in addition to the thermal stress generated when the heat generated at the energized part is transferred to the resin mold.
  • the nondestructive inspection is performed using a stress measuring device using synchrotron radiation such as X-rays. In this case, the stress is measured from the X-ray diffraction of the inorganic filler compounded with the resin mold.
  • the stress acting on the powdered composite inorganic filler may be regarded as the stress applied to the resin mold itself.
  • the measured stress value reflects the adhesion state between the inorganic filler and the resin base material at the micro level. Specifically, at the time of resin molding, the inorganic filler and the resin base material are firmly adhered at a micro level, and an equivalent and non-zero stress acts on both the inorganic filler and the resin base material. When aged or a thermal load is applied, the adhesion between the inorganic filler and the resin base material becomes weak, and the stress is eventually released.
  • the microstructure of the powder of inorganic filler compounded in the resin mold for electrical insulation may be either crystalline with regular atomic arrangement or amorphous with irregular atomic arrangement, but stress measurement by X-ray In the case of conducting, it is necessary to be crystalline having a clear diffraction pattern.
  • Examples of the crystalline inorganic filler include crystalline silica, aluminum oxide, aluminum hydroxide, calcium carbonate, iron oxide, titanium oxide, zirconium oxide, cesium oxide and the like. Moreover, the compounding quantity of an inorganic filler is arbitrary.
  • the first process described above is a resin internal state inspection process, a surface layer stress inspection process, or an interface stress inspection process.
  • the stress S2 applied to the surface layer portion 24 of the resin mold for electrical insulation provided in the electrical device 11 obtained in the ⁇ first step S101> and the stress ratio accumulated in the stress ratio database 11C The product of (S1 / S2) is calculated and converted to the stress S1 applied to the interface 23 with the energized part.
  • the stress ratio is functionalized according to the size, output, and energization state of the electrical device 1, a stress ratio suitable for the status of the electrical device used for diagnosis is input.
  • the stress S1 applied to the interface part 23 between the energized part and the resin mold for electrical insulation obtained in the ⁇ second step S102> is applied to the fatigue life curve, and the number of repeated stress loads is calculated. Convert.
  • the fatigue life curve is created by substituting the two material fatigue constants in the database obtained in 12B into an empirical expression such as an exponential Basquin rule or Coffin-Manson rule. By substituting the stress S1 of the interface 23 for the fatigue life curve, the number of repetitions corresponding to the stress can be obtained.
  • the second step described above is a resin mold stress specifying process, a resin mold internal stress specifying process, a current-carrying part stress specifying process, or an interface stress specifying process.
  • the number of repetitions obtained from the fatigue life curve is converted into the number of years elapsed of the electrical equipment 11. For example, if you continue to use an electrical device at maximum output for a long period of time and the thermal load on the resin mold is repeated, the electrical device has accumulated more years than actually passed from the date of manufacture of the electrical device. It becomes equal to the state of.
  • Equivalent age is the number of years that have elapsed in the use of electrical equipment, taking into account such usage conditions.
  • the equivalent elapsed years are longer than the actual elapsed years.
  • the equivalent elapsed years may be shortened, for example, when the electronic device is stored without being used at all.
  • the conversion of the number of repetitions obtained from the fatigue life curve to the equivalent number of elapsed years is performed using a conversion coefficient. For example, when an electric device is operated continuously regardless of day and night, the thermal stress increases and decreases once due to the temperature difference between day and night.
  • the conversion coefficient is 1 day / time.
  • the third step based on the material fatigue constant obtained from the material fatigue constant database, the relationship between the stress applied to the interface and the corresponding elapsed time is obtained, and this relationship is obtained in the second step.
  • the stress applied to the surface layer portion may be applied to obtain the equivalent elapsed years.
  • the remaining life can be obtained by subtracting the number of elapsed years of the electrical equipment from the design life of the electrical equipment.
  • the remaining life means the remaining number of years that the electrical equipment can be safely used while ensuring electrical insulation.
  • the remaining life shows a negative value, the electric device has already reached the state exceeding the design life.
  • the third process described above is, in other words, equivalent elapsed year identification processing, resin mold equivalent age identification processing, or mold transformer equivalent lifetime identification processing.
  • FIG. 3 is a block configuration diagram showing a diagnostic system for an electrical device including an electrically insulating resin mold according to an embodiment of the present invention.
  • the electrical equipment diagnosis system includes a surface layer stress measurement device 30 and a diagnosis device 40.
  • the surface layer stress measuring device 30 is a device that measures the stress S2 applied to the surface layer portion 24 of the resin mold for electrical insulation provided in the electric device 11, and uses, for example, an X-ray stress measuring device that measures stress from X-ray diffraction. be able to.
  • the diagnostic device 40 includes an interface stress calculation unit 42, a resin mold stress ratio database 43, an equivalent elapsed year calculation unit 44, a material fatigue constant database 45, and a display unit 46.
  • the resin mold stress ratio database 43 performs finite element modeling based on the component structure of the electrical equipment, performs thermal stress analysis of the electrical equipment, and obtains the stress ratio S1 / S2 between the surface layer stress and the interface stress, It is a database.
  • the material fatigue constant database 45 is a database in which the fatigue life curve is obtained by conducting a fatigue life test on the test piece of the resin mold material provided in the electric equipment, and the material fatigue constant obtained from the fatigue life curve is made into a database. .
  • the interface stress calculation unit 42 calculates the product of the surface layer stress S2 measured by the surface layer stress measurement device 30 and the stress ratio accumulated in the resin mold stress ratio database 43, and calculates the stress S1 applied to the interface. To do.
  • the equivalent elapsed year calculation unit 44 applies the interface stress obtained by the interface stress calculation unit 42 to a fatigue life curve created based on the material fatigue constants in the material fatigue constant database 45 to obtain the number of stress load repetitions.
  • the display part 46 displays the equivalent elapsed years of the obtained electrical equipment.
  • the display unit 46 may be provided in the diagnostic device 40, or may be a tablet terminal or the like that is separate from the diagnostic device, and a display signal may be transmitted from the diagnostic device thereto.
  • the surface layer stress measuring device 30 and the diagnostic device 40 are described as separate devices, but the two devices may be integrated into one device.
  • the diagnostic method and diagnostic system for an electrical device including the resin mold for electrical insulation described above provides the thermal stress applied to the resin mold at the interface portion 23 between the energized portion inside the electrical device and the resin mold, which regulates the failure of the electrical device. Based on this, it is possible to provide a highly accurate diagnostic technique for obtaining the equivalent age and remaining life of electrical equipment.
  • the electrical device was diagnosed according to the above diagnostic procedure.
  • a mold transformer was chosen as a representative of electrical equipment.
  • the transformer used for diagnosis is equipped with a coil wound with copper wire as a current-carrying part and a resin mold around it for electrical insulation.
  • the resin mold is made of a composite material of epoxy resin and contains crystalline silica as a main filler.
  • the ratio (S1 / S2) of the stress applied to the resin mold at the interface with the coil and the stress on the surface layer of the resin mold was determined.
  • Table 1 shows the analysis results of stress ratios for three transformers with different dimensions, outputs, and energized states. All transformers of No. 1, No. 2 and No. 3 have been used for 10 years since the start of energization. In the dimensions, the height of the coil portion is shown as a representative value.
  • the energization load factor is the ratio of the load factor in actual use that occupies the maximum capacity of the transformer. The larger this value, the greater the heat generation, and the greater the generation of thermal stress. From the comparison between No. 1 and No. 2 in Table 1, it can be seen that the stress ratio increases as the energization load factor increases.
  • Table 1 is an example of a resin mold stress ratio database 11C.
  • FIG. 4 shows a fatigue life curve obtained from the fatigue life test.
  • the fatigue life curve is plotted with an exponential Basquin rule.
  • the No. 1 and No. 2 curves have an intercept of 110 MPa and an exponential coefficient of -0.04, and the No. 3 curve has an intercept of 100 MPa and an exponential coefficient of -0.08.
  • the resin mold material used for transformer No. 3 was obtained from the material fatigue constant, that is, the tensile strength obtained from the section and the index part, compared to the resin mold material used for transformer No. 1, No. 2. Both of the coefficients representing the degree of attenuation of the stress value are small.
  • the resin mold material used for transformer No. 3 has a lower tensile strength than the resin mold material used for transformer No. 1 and No. 2, and the number of repetitions increases. Thus, it can be seen that the amount of decrease in the stress value is large.
  • Table 2 shows an example of the obtained material fatigue constant database 12B.
  • the stress applied to the surface layer portion of the resin mold is calculated by using the stress ratio S1 / S2 stored in the stress ratio database obtained in [1] at the interface stress calculation section. Converted into stress acting on the resin mold at the interface with the coil to be molded.
  • the transformer of this example is operated continuously regardless of day and night, and because the increase and decrease in thermal stress occurs once a day due to the temperature difference between day and night, the conversion coefficient was set to 1 day / time.
  • the relationship between the stress applied to the interface portion prepared in advance and the equivalent elapsed years may be used, and an example is shown in FIG. Table 3 summarizes the diagnostic results for transformers No. 1, No. 2, and No. 3.
  • the No. 1 transformer is diagnosed as having approximately the same age as the actual age.
  • the transformers of No. 2 and No. 3 are diagnosed as having a considerable age exceeding the actual age.
  • all transformers of No. 1, No. 2, and No. 3 are designed with a lifespan of 30 years. By subtracting the number of years elapsed from the life of 30 years, the remaining life of the transformer can be calculated as 19.9 years for No. 1, 15.2 years for No. 2, and 7.4 years for No. 3. From the outside, the signs of internal interface peeling and resin mold cracking, which cause failure, can be digitized and diagnosed appropriately.
  • peeling of the interface between the current-carrying site inside the electrical equipment and the resin mold and cracking of the resin mold are due to repeated thermal stress that is naturally applied during the operation of the electrical equipment.
  • the present invention has been described by taking a transformer as an example.
  • the present invention is not limited to a transformer, and can be used for all electric devices in which energized parts such as a switch, a motor, an inverter, etc. are resin-molded.
  • the three diagnosis steps including the first step S101, the second step S102, and the third step S103 have been described.
  • the second embodiment as in the first embodiment, an example of a display method and a diagnosis method when using S101 to S103 will be described.
  • the deterioration state of conventional resin molds is due to destructive inspection. For example, in a device such as a transformer that requires continuous operation day and night, inspection cannot be performed unless operation is stopped.
  • the life can be diagnosed by the nondestructive inspection of the resin mold as in the first embodiment.
  • FIG. 6 is a diagram illustrating an example of an inspection method.
  • the mold transformer 100 has a resin mold 110. A state in which the resin mold 110 is imaged by the inspection means 120 is shown.
  • the inspection unit 120 is irradiated with optics or X-rays and is reflected from the resin mold 110.
  • the life information of the mold transformer 100 to be described later is displayed on the display means 150, and the display result is observed by the inspector 200.
  • FIG. 7 shows an example of a diagnosis region of the mold transformer 100 having the resin mold 110 to be diagnosed shown in FIG. Diagnosis areas described later may be performed with areas or resolutions, but are described here as areas A111, B112, and C113.
  • the inspection means 120 is used to observe or image the resin mold 110.
  • the inspection unit 120 will be described as an inspection, it may be imaging or photographing, and may be any unit that can observe the surface state of the resin mold 110.
  • the inspection unit 120 will be described later using a detection unit 121 that images the surface of the resin mold 110, a storage unit 122 that stores the captured image of the resin mold, and an image of the resin mold 110 stored in the storage unit 122. It has the control part 123 which calculates the equivalent elapsed years, and the communication part 124.
  • the inspection unit 120 may have a display unit 125 as necessary.
  • the display unit 125 displays the image and data acquired by the detection unit 121 and displays information received from the communication unit 124.
  • the detection unit 121 images the surface of the resin mold 110 formed so as to cover the coil of the mold transformer 100.
  • the storage unit 122 stores temperature distribution information on the surface of the resin mold 110. Further, the method described in Embodiment 1 or Example 1 may be used without using the temperature distribution information.
  • the imaging method uses thermography for observing the surface temperature distribution of the resin mold 110.
  • thermography it is only necessary to observe the surface temperature distribution, and not only thermography but also an imaging method capable of acquiring infrared wavelengths as numerical values from an object to be inspected.
  • thermography it is not essential to measure the surface temperature of the entire resin mold 110 such as thermography in order to specify the surface stress using thermal stress analysis.
  • the surface layer stress can be specified only by measuring a part of the temperature. In this case, for example, it can be carried out if the temperature of the portion irradiated with the laser light can be measured.
  • the method is not limited to laser light, and a method of measuring the temperature of the resin mold 110 by means such as a thermometer may be employed. More accurate thermal stress analysis can be performed by measuring a wider area than pinpoint temperature measurement.
  • the detection unit 121 can acquire the temperature distribution on the surface of the resin mold 110 by performing it while the mold transformer 100 is in operation (also referred to as an operating state). This is because in order to calculate the thermal stress from the surface temperature distribution of the resin mold 110, it is necessary to acquire the temperature distribution during operation.
  • the method of thermal stress analysis is performed using the temperature distribution on the surface of the resin mold 110 in the operating state.
  • the resin mold stress ratio database 11C and the thermal stress analysis 11B shown in FIG. 1 described in the first embodiment may be used.
  • control unit 123 acquires or converts the surface temperature distribution of the image captured by the detection unit 121, and then processes in the order of the first step S101, the second step S102, and the third step S103. .
  • the life or deterioration state of the mold 110 is specified by such processing steps.
  • the first to third steps S101 to S103 may be performed by the control unit 123 of the inspection unit 120 or the control unit 153 of the display unit 150, or may be performed by another computer or the like.
  • the resin mold 110 at the time of shipment of the mold transformer 100 has a shrinkage stress on the coil.
  • the shrinkage stress is generated by shrinkage when the resin mold 110 before solidification covering the coil is solidified. Insulating property can be maintained by covering the coil with the resin mold 110 which is an insulating member.
  • the shrinkage stress decreases with time from the production of the mold transformer 100.
  • the resin mold 110 is heated by the operation of the mold transformer 100, and then the load factor is lowered to cool or dissipate heat. At this time, the resin mold 110 undergoes thermal expansion and contraction, and the load stress (interfacial stress) between the coil and the resin mold 110 changes.
  • the load stress when the load stress is lowered, there may be a gap between the coil and the resin mold 110 and partial discharge may occur.
  • the value of the partial discharge exceeds a predetermined value, the mold transformer 100 needs to be replaced. Further, it is considered that the partial discharge can also be caused by scattering of silica inside the resin mold 110.
  • the control unit 123 calculates the surface stress of the resin mold 110 by performing thermal analysis using the temperature distribution information on the surface of the resin mold 110 stored in the storage unit 122.
  • the void can be specified using the processing method for specifying the interface stress using the stress ratio described in the first embodiment. Also, it is better to specify the gap at the interface between the coil of the same model and the resin mold 110 and the stress at the interface. can do.
  • control unit 123 may also specify the temperature distribution information on the surface of the resin mold 110.
  • the detection unit 121 has a means for detecting the wavelength of infrared rays, calculation and conversion from the wavelength and intensity to temperature distribution information can be performed.
  • Interfacial stress measurement is not limited to those using thermal stress analysis, but is compared with actual data of interfacial stress measured by disassembling the resin mold of a transformer of the same model or model number, and the resin to be measured The mold may be compared and specified.
  • the equivalent elapsed years (also referred to as equivalent use years or substantial transformer age) of the imaged mold transformer 100 may be specified using the surface layer stress and the interface stress. .
  • “equivalent elapsed years” is a concept of a virtual elapsed years considering a use state specified from an actual use environment, unlike the time when the mold transformer 100 is actually used.
  • the service life of the mold transformer 100 is specified assuming a predetermined operating state and a load factor to be used. However, if the use is continued in an environment where the load factor is high with respect to the predetermined operating state, etc., If it is assumed that a large amount of time has passed and the use is continued in an environment where the load factor is low with respect to a predetermined operation state or the like, the number of years elapsed is considered to be small. Note that when the load factor is low with respect to a predetermined operation state or the like, the influence of the deterioration of the resin mold 110 due to thermal stress is small, so that the considerable elapsed time may coincide with the actual use time.
  • the identified equivalent elapsed years are displayed on the display means 150 shown in FIG. You may display on the test
  • the display unit 150 is operated by the communication unit 154 that communicates with the inspection unit 120 and other devices, the control unit 153 that calculates and calculates the communicated information, and the control unit 153.
  • a storage unit 152 that stores the received information
  • a display unit 155 that displays the information stored in the storage unit 152 and the communicated information.
  • You may have input means, such as a touch panel, a keyboard, and a mouse
  • Transformer surface temperature distribution information 500 is displayed in the upper left area of the display unit 155 of the display means 150. Further, a measurement region 501 corresponding to the transformer surface temperature distribution information 500, a surface temperature 502, and a measurement value 503 are displayed on the upper right side of the display unit 155.
  • the model information 511 of the measured mold transformer 100, the size information 512 of the transformer, the stress gradient value information 513, the actual age information 514 (the actual age, the actual age) Equivalent age information 515 (also called real transformer age) is displayed. It is not necessary to display all of these pieces of information, and at least the equivalent elapsed year information 515 can be displayed.
  • the transformer surface temperature distribution information 500 divides the area into large areas, and in this example, three areas A, B, and C are displayed. Each region can be colored or hatched to visualize the surface temperature.
  • the average temperature of the areas A, B, and C of the measurement area 501 and the temperature at the position of the cursor 505 are displayed as the surface temperature 502.
  • the surface portion stress 503 calculated from the surface temperature information is displayed.
  • the cursor 505 moves by operating the touch panel or operating the cursor 505, and appropriately displays the temperature at the position of the cursor 505.
  • the transformer surface temperature distribution information 500 can know not only the rough surface temperature in the region using the color map but also the detailed surface temperature at a specific position.
  • the equivalent elapsed years 515 specified using the information on the surface stress 503 and the interface stress 504 are displayed.
  • the actual number of years 514 (the actual usage time of the transformer) is displayed. This makes it possible to compare the actual usage time with the equivalent elapsed years of the transformer. In this case, it means that the diagnosed mold transformer 100 has been used for four years more than the actual usage time.
  • the stress gradient rate 513 specified based on the amount of change in the surface portion stress 503 may be displayed.
  • the stress gradient rate indicates the amount of change between shipment and measurement.
  • the stress gradient rate 513 may be specified using the interface stress 504. In any case, by displaying the stress gradient rate 513, it is possible to indicate the degree of progress of the assumed usage time with respect to the actual usage time of the mold transformer 100.
  • the actual use time was 25 years, but the elapsed time (actual transformer age) is 29 years. Because there is, it turns out that the exchange time is near. That is, it can be seen that the mold transformer 100 to be measured was used in an environment where the estimated usage time is added to the actual usage time, and can be notified to the user that replacement is necessary. Therefore, it is possible to know the replacement time of the mold transformer using the corresponding elapsed years.
  • the surface portion stress 503 may display the surface portion stress calculated by observing the surface portion of the resin mold 110 using the X-ray of Embodiment 1 in addition to the surface temperature 502.
  • the mold transformer 100 is often operated for a long time in a predetermined load state at a predetermined time zone, the temperature distribution on the surface of the resin mold 110 for one day is observed over time such as time-lapse observation. The thermal stress of the resin mold up to can be estimated more accurately.
  • the relationship between the load factor and the surface temperature distribution can be specified, and the surface stress with higher accuracy can be specified. As a result, a highly accurate life diagnosis can be performed.
  • Example 3 which is an example of the display method will be described with reference to FIG. An example in which the equivalent elapsed years are specified for the types AAA, AAB, AAC, and AAD among the four types of molded transformers 100 will be shown. The difference from the previous display example is that it has replacement year information 516. All mold transformers have a service life (service life) of 30 years.
  • the replacement year information 516 indicates the replacement time of the transformer specified by comparing the service life and the corresponding elapsed time. In the case of the model AAA, it is desirable that the equivalent service life is subtracted from the useful life of 30 years and the replacement time is within one year. This is displayed as replacement year information 516.
  • the replacement year information 516 may have a function of indicating the replacement time with three indicators.
  • yellow and red indications may be used as characters as “Needs Attention” and “Danger” corresponding to the degree of polymerization used as an index of the oil-filled transformer.
  • “Caution” is displayed in yellow and “Danger” is displayed in red.
  • the replacement year information 516 is displayed for the remaining five years.
  • the center yellow is lit.
  • the model AAC shows that the replacement year information 516 is over two years. In this case, it indicates that a replacement is required promptly. At this time, if the indicator is red, it is better to blink. It turns out that the degree of urgency is higher.
  • the replacement time is displayed as red, yellow, or blue with the replacement time passed or 1 year, 5 years, or 10 years as a threshold value, but may be set at a predetermined value. Considering the replacement time of the mold transformer 100, it is convenient for the user to display about three years as yellow until the replacement.
  • the above three indicators are not limited to the three colors of blue, yellow, and red, and may be indicated by colors or color bars for displaying three stages.
  • Fig. 16 shows the case of displaying with a color bar.
  • Model information 511 and replacement year information 516a are shown.
  • the color bar of the replacement year information 516a displays ten bars having different lengths. If the remaining three years, such as model AAI, it is better to light up the three in short order and display the remaining seven as light gray.
  • model AAJ it is only necessary to turn on five and turn off the remaining five (non-lighting state).
  • model AAK all the lights should be lit. If the model is AAL, the replacement time is over one year, so the color bar should be grayed out and turned off or blinking. Alternatively, all the lights may be lit in a color different from the state where there is a margin until the replacement.
  • the color bars are red from the left, 4 yellow from the 5th, and green or blue from the 6th to the 10th, the color bar is easy to recognize.
  • the interfacial stress 517 and the average use energization 518 in the actual use environment are displayed on the upper stage, and the assumed replacement time 520 is displayed on the lower stage.
  • the interface load stress 517 is an interface stress specified from the surface layer stress described in the first embodiment.
  • the display of the stress gradient rate 513 is not essential.
  • the threshold value of the interface stress that is 30 years, which is the service life, is displayed, that is, the interface stress that is determined to have an equivalent elapsed time of 30 years is displayed. Display the current status and the number of years until the recommended replacement time. Thereby, the replacement recommendation time in consideration of the actual usage load ratio of the resin mold 110 can be specified.
  • the actual use load ratio when replaced or the interface stress when replaced is displayed, and the recommended replacement time is also displayed. it can.
  • the replacement time it is possible to know the replacement time visually by adopting the three indicators described in the third embodiment.
  • replacement is recommended before the equivalent age reaches 29 years, and when the equivalent elapsed age diagnosed this time is 26 years, the recommended replacement time is within 3 years.
  • the equivalent elapsed year 28 the user who actually uses the model AAE displays the replacement time corresponding to the equivalent elapsed year, so that the user can easily determine the replacement time.
  • FIG. 12 shows model information 511, transformer size information 512, (predicted) actual elapsed years 514a, equivalent elapsed years information 515a, used energization average information 518, and transformer capacity information 519. Since the actual age 514a is an estimated value, it is also a predicted actual age.
  • the use energization average information 518 is a value in consideration of the use situation of the diagnosed mold transformer 100.
  • the transformer capacity information 519 corresponds to the model information 511 and is information stored in advance in a database or the like.
  • the mold transformer 100 in which the interface stress is specified is of the model AAE, and the actual usage time and the corresponding elapsed years are displayed.
  • the model AAE is replaced (replaced)
  • the equivalent elapsed years are the same years.
  • the models AAF and AAG are displayed as candidate transformers to be replaced.
  • the figure shows a case where the size is close to that of the transformer used and the transformer capacity is replaced with a larger one than the model AAE.
  • the average energization of the models AAF and AAG is 60% and 50%. Based on the average use energization information of the model AAE, the equivalent elapsed years when used in the same manner as the models AAE of the models AAF and AAG are specified and displayed. In other words, since the resin mold 110 or the like is not actually measured for the equivalent elapsed years of the models AAF and AAG, data and the like measured by the other models AAF and AAG are used.
  • the temperature distribution on the transformer surface is the same distribution if there is no disturbance and the same model.
  • the temperature distribution when the models AAF and AAG are operated in the same way as the model AAE by calculating the temperature distribution of the models AAF and AAG from the measurement data of the same model and applying the average usage information of the model AAE to the models AAF and AAG.
  • the state can be specified.
  • the corresponding usage time and the predicted actual usage time can be obtained using the temperature distribution state.
  • the equivalent usage time when the predicted actual usage time is 20 years is displayed as in the model AAE.
  • the model is replaced with the model AAE, the actual use time and the equivalent use time coincide with each other, which is preferable as a replacement target.
  • the accuracy of specifying the predicted actual usage time and the number of years elapsed will be improved.
  • Example 6 will be described with reference to FIG. 13 for a method of displaying the replacement period for each industry.
  • the information which diagnosed the model AAH of the mold transformer 100 is displayed on the upper stage.
  • the actual age 514 is 22 years, while the equivalent age 515a is 23 years.
  • the replacement time for each industry is displayed in the lower part. Specifically, industry information 530a, industry-specific replacement recommended use years 530b, and recommended years 530c until replacement are displayed. As the recommended replacement years for each industry type 530b, the replacement years of transformers for each industry type are stored in advance in the storage unit.
  • the user can easily determine when to replace the transformer. Note that it is possible to determine the replacement time even if only the lower table is displayed.
  • the replacement time information 516 shown in FIG. 11 can be used as the recommended time 530c until the replacement.
  • Example 7 a method of displaying the life prediction information 540 of the mold transformer 100 whose surface temperature is measured will be described with reference to FIG.
  • the life prediction information 540 indicates a state in which the temperature at a specific location in the transformer surface temperature distribution information 500 described with reference to FIG. 9 is observed.
  • the upper graph shows the measured temperature on the vertical axis and the corresponding measurement time on the horizontal axis. That is, it shows a temperature change at a predetermined location on the surface of the mold transformer 100.
  • the lower row is a table in which characteristic temperatures identified from the graph are extracted.
  • a time zone 540a, a temperature 540b, a recommended value 540c, and a recommended load factor 540d are shown.
  • the time zone 540a is a characteristic value extracted.
  • a known method such as determination of the maximum value can be used for extracting the feature amount.
  • the recommended value 540c is shown for the characteristic time zone temperature 540b.
  • the recommended value 540c is a temperature that becomes a recommended value
  • the recommended load factor 540d indicates a recommended value for changing the load factor (use state) of the mold transformer 100 at the time of temperature measurement.
  • the load factor is 2%. Lower it. Moreover, it is good to raise a load factor 8% in the time slot
  • this can extend the life of the mold transformer 100 by suppressing the temperature change of the resin mold 110.
  • Example 7 shows the interfacial stress 517 and the partial discharge converted value 550a corresponding to the measured load stress.
  • the amount of the gap between the coil and the resin mold 110 can be estimated from the internal state of the resin mold 110 and the interface stress. Using these internal states and the amount of voids, the partial discharge value 550a of the mold transformer 100 is converted.
  • a partial discharge value obtained by actually measuring another mold transformer 100 of the same model is prepared in advance as a database.
  • a partial discharge value conversion table corresponding to the interfacial stress or surface layer stress of the resin mold 110 and the internal state is prepared.
  • the partial discharge value can be converted from the interface stress and the internal state using the conversion table.
  • the interface stress 517 at the time of shipment is 39 MPa, and the partial discharge conversion value 550 a at this time is 0.
  • Measured load stresses measured 3 years ago and predicted 3 years later are 38, 37, and 36 MPa, respectively, and partial discharge conversion values are XXX, YYY, and ZZZ.
  • the measurement stress values measured three years ago and the current measurement are actually load stresses specified from the surface temperature distribution of the resin mold 110 and the like.
  • the future internal state of the resin mold 110 and the amount of gap between the coil and the resin mold 110 can be predicted.
  • the measured load stress predicted after three years can be displayed, and the corresponding partial discharge converted value can also be shown.
  • the partial discharge converted value 550a is an index well known in the transformer industry, and can provide an index that is easy for the user to understand.

Abstract

La présente invention concerne un procédé de haute précision pour le diagnostic d'un appareil électrique en quantifiant les contraintes exercées sur un moule en résine au niveau d'une partie d'interface entre une partie sous tension à l'intérieur de l'appareil électrique et le moule en résine. Ce système de diagnostic pour appareil électrique équipé d'un moule en résine pour l'isolation électrique comprend : un moyen de mesure pour mesurer le moule en résine pour l'isolation électrique ; un moyen de commande ; et un moyen d'affichage. Le moyen de mesure mesure la contrainte exercée sur une partie de couche superficielle du moule en résine pour l'isolation électrique. La partie de commande convertit la contrainte mesurée exercée sur la partie de couche superficielle en une contrainte exercée sur la partie d'interface entre le moule en résine pour l'isolation électrique et un matériau conducteur recouvert par le moule en résine pour l'isolation électrique et identifie également un nombre équivalent d'années écoulées pour le moule en résine pour l'isolation électrique sur la base de la contrainte exercée sur la partie d'interface. Le moyen d'affichage affiche le nombre équivalent d'années écoulées identifié.
PCT/JP2017/004619 2016-02-17 2017-02-08 Procédé de diagnostic et système de diagnostic pour appareil électrique équipé d'un moule en résine pour l'isolation électrique WO2017141793A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2016-027723 2016-02-17
JP2016027723A JP6668101B2 (ja) 2016-02-17 2016-02-17 電気絶縁用樹脂モールドを備えた電気機器の診断方法および診断システム
JP2016029472A JP6670629B2 (ja) 2016-02-19 2016-02-19 電気機器の診断システム
JP2016-029472 2016-02-19

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004012270A (ja) * 2002-06-06 2004-01-15 Meidensha Corp モールド品の内部ひずみ測定法
JP2006267089A (ja) * 2005-02-28 2006-10-05 Kobe Steel Ltd 構造部材の応力推定方法
JP2007285930A (ja) * 2006-04-18 2007-11-01 Fuji Electric Systems Co Ltd 高分子材料の劣化診断方法および装置
JP2014092512A (ja) * 2012-11-06 2014-05-19 Hitachi Metals Ltd ケーブルの屈曲断線寿命予測方法および装置
WO2015132838A1 (fr) * 2014-03-03 2015-09-11 株式会社日立製作所 Procédé et dispositif pour afficher une fatigue de matériau de machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004012270A (ja) * 2002-06-06 2004-01-15 Meidensha Corp モールド品の内部ひずみ測定法
JP2006267089A (ja) * 2005-02-28 2006-10-05 Kobe Steel Ltd 構造部材の応力推定方法
JP2007285930A (ja) * 2006-04-18 2007-11-01 Fuji Electric Systems Co Ltd 高分子材料の劣化診断方法および装置
JP2014092512A (ja) * 2012-11-06 2014-05-19 Hitachi Metals Ltd ケーブルの屈曲断線寿命予測方法および装置
WO2015132838A1 (fr) * 2014-03-03 2015-09-11 株式会社日立製作所 Procédé et dispositif pour afficher une fatigue de matériau de machine

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