CN108594089B - Method and device for detecting polymerization degree of insulating paper in transformer - Google Patents
Method and device for detecting polymerization degree of insulating paper in transformer Download PDFInfo
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- CN108594089B CN108594089B CN201810404782.3A CN201810404782A CN108594089B CN 108594089 B CN108594089 B CN 108594089B CN 201810404782 A CN201810404782 A CN 201810404782A CN 108594089 B CN108594089 B CN 108594089B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1218—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using optical methods; using charged particle, e.g. electron, beams or X-rays
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
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Abstract
The embodiment of the invention discloses a method and a device for detecting the polymerization degree of insulating paper in a transformer, wherein the method comprises the following steps: obtaining suspended fiber particles from insulating oil of a transformer, and obtaining a refractive index difference diagram to be analyzed of the suspended fiber particles through a single polarization system; generating a color proportion vector of the refractive index difference diagram to be analyzed according to the calculated color proportion of the refractive index difference diagram to be analyzed; calculating a first distance between a color proportion vector of a refractive index difference chart to be analyzed and a color proportion vector of a preset image, wherein the preset image is the refractive index difference chart of suspended fiber particles of unaged insulating oil; and inputting the first distance into a preset model to obtain the polymerization degree, wherein the preset model is a relation model between the distance and the polymerization degree. The invention does not need the transformer to stop running, and the lifting cover is used for coring, and is not influenced by the oil filtering, oil changing and the like of the transformer.
Description
Technical Field
The invention relates to the field of transformers, in particular to a method and a device for detecting the polymerization degree of insulating paper in a transformer.
Background
The oil paper insulation is the main insulation form of the power transformer, the insulation performance of the transformer is continuously deteriorated along with the increase of the operation life of the transformer, and the operation safety and reliability of the transformer are seriously affected by the aging of solid insulation. Therefore, the aging evaluation of the oiled paper insulation is of great significance.
However, although the conventional evaluation methods such as Tensile Strength (TS) and average Degree of Polymerization (DP) can reflect the aging state of the insulating paper more directly, they require that the transformer be removed from operation and the hood be cored during measurement, and are difficult to use for on-site measurement. Although the contents of furfural, CO and CO2 are widely used for field monitoring of transformer insulation, the measurement result is easily influenced by operation factors such as oil filtering, oil changing and the like and environmental factors, so that the aging state evaluation accuracy of transformer insulation paper is reduced due to too many influencing factors in the current measurement method.
Disclosure of Invention
The embodiment of the invention provides a method and a device for detecting the polymerization degree of insulating paper in a transformer, which can be used for evaluating the polymerization degree of the insulating paper in the transformer.
According to an aspect of the present invention, there is provided a method for detecting a degree of polymerization of insulating paper in a transformer, including:
obtaining the suspended fiber particles from insulating oil of a transformer, and obtaining a refractive index difference diagram to be analyzed of the suspended fiber particles through a single polarization system;
generating a color proportion vector of the refractive index difference diagram to be analyzed according to the calculated color proportion of the refractive index difference diagram to be analyzed;
calculating a first distance between a color proportion vector of the refractive index difference chart to be analyzed and a color proportion vector of a preset image, wherein the preset image is the refractive index difference chart of suspended fiber particles of unaged insulating oil;
and inputting the first distance into a preset model to obtain the polymerization degree, wherein the preset model is a relation model between the distance and the polymerization degree.
Preferably, the generating a color proportion vector of the refractive index difference chart to be analyzed according to the calculated color proportion of the refractive index difference chart to be analyzed specifically includes:
determining a plurality of characteristic observation regions of the refractive index difference diagram to be analyzed;
calculating the color proportion of each characteristic observation region, and correspondingly generating a color proportion vector of each characteristic observation region according to the color proportion of each characteristic observation region;
the calculating of the first distance between the color proportion vector of the refractive index difference chart to be analyzed and the color proportion vector of the preset image is specifically as follows:
and respectively calculating second distances between the characteristic observation regions and the color proportion vectors of the preset images, and performing mean value calculation on all the second distances to obtain first distances between the color proportion vectors of the refractive index difference diagram to be analyzed and the color proportion vectors of the preset images.
Preferably, the color ratios include a red color ratio and a blue color ratio.
Preferably, the color proportion of the characteristic observation region is calculated by the formula
In the formula, ri、biAs a color ratio of the i-th characteristic observation region, Rj、Gj、BjIs the color component of the jth pixel point, and p is the number of the pixel points.
Preferably, the method for detecting the degree of polymerization of the insulating paper in the transformer further comprises the following steps:
and fitting the training distance corresponding to the suspended fiber particles of the insulating oil in each preset aging stage and the polymerization degree of the insulating paper in each preset aging stage to obtain the preset model.
Preferably, the preset model is:
wherein DP is the degree of polymerization, k1，k2For the fitting coefficient, V is the distance.
Preferably, the training distance, the first distance and the second distance are mahalanobis distances.
According to another aspect of the present invention, there is provided an apparatus for detecting a degree of polymerization of insulating paper in a transformer, comprising:
the acquisition module is used for acquiring the suspended fiber particles from the insulating oil of the transformer and acquiring a refractive index difference diagram to be analyzed of the suspended fiber particles through a single polarization system;
the generating module is used for generating a color proportion vector of the refractive index difference chart to be analyzed according to the calculated color proportion of the refractive index difference chart to be analyzed;
the calculation module is used for calculating a first distance between a color proportion vector of the refractive index difference chart to be analyzed and a color proportion vector of a preset image, and the preset image is the refractive index difference chart of suspended fiber particles of unaged insulating oil;
and the input module is used for inputting the first distance into a preset model to obtain the polymerization degree, and the preset model is a relation model between the distance and the polymerization degree.
According to another aspect of the present invention, there is provided an apparatus for detecting a degree of polymerization of insulating paper in a transformer, comprising: a memory, and a processor coupled to the memory;
the processor is configured to execute the method for detecting the degree of polymerization of the insulating paper in the transformer as described above based on the instructions stored in the memory device.
According to another aspect of the present invention, there is provided a computer-readable medium having stored thereon a computer program which, when executed by a processor, implements the above-described method for detecting the degree of polymerization of insulating paper in a transformer.
According to the technical scheme, the embodiment of the invention has the following advantages:
the invention provides a method and a device for detecting the polymerization degree of insulating paper in a transformer, wherein the method comprises the following steps: obtaining suspended fiber particles from insulating oil of a transformer, and obtaining a refractive index difference diagram to be analyzed of the suspended fiber particles through a single polarization system; generating a color proportion vector of the refractive index difference diagram to be analyzed according to the calculated color proportion of the refractive index difference diagram to be analyzed; calculating a first distance between a color proportion vector of a refractive index difference chart to be analyzed and a color proportion vector of a preset image, wherein the preset image is the refractive index difference chart of suspended fiber particles of unaged insulating oil; and inputting the first distance into a preset model to obtain the polymerization degree, wherein the preset model is a relation model between the distance and the polymerization degree. The invention extracts the color chromaticity characteristic quantity from the refraction difference image of the suspended fiber particles in the insulating oil to evaluate the polymerization degree of the insulating paper in the transformer, does not need the transformer to stop running, takes core by hanging a cover, and is not influenced by the oil filtering, oil changing and the like of the transformer.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic flow chart of an embodiment of a method for detecting a degree of polymerization of insulating paper in a transformer according to the present invention;
FIG. 2 is a schematic flow chart of another embodiment of a method for detecting the degree of polymerization of insulating paper in a transformer according to the present invention;
fig. 3 is a schematic structural diagram of an embodiment of a device for detecting a degree of polymerization of insulating paper in a transformer according to the present invention;
FIGS. 4-11 are plots of refractive index differences for 0, 4, 7, 10, 22, 35, 60, 90 days of aging in 140 degree oil;
fig. 12 is a diagram showing the fitting results.
Detailed Description
The embodiment of the invention provides a method and a device for detecting the polymerization degree of insulating paper in a transformer, which can be used for evaluating the polymerization degree of the insulating paper in the transformer.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of a method for detecting a degree of polymerization of an insulating paper in a transformer according to the present invention includes:
101. obtaining suspended fiber particles from insulating oil of a transformer, and obtaining a refractive index difference diagram to be analyzed of the suspended fiber particles through a single polarization system;
102. generating a color proportion vector of the refractive index difference diagram to be analyzed according to the calculated color proportion of the refractive index difference diagram to be analyzed;
103. calculating a first distance between a color proportion vector of a refractive index difference chart to be analyzed and a color proportion vector of a preset image, wherein the preset image is the refractive index difference chart of suspended fiber particles of unaged insulating oil;
104. and inputting the first distance into a preset model to obtain the polymerization degree, wherein the preset model is a relation model between the distance and the polymerization degree.
The invention provides a method for detecting the polymerization degree of insulating paper in a transformer, which comprises the following steps: obtaining suspended fiber particles from insulating oil of a transformer, and obtaining a refractive index difference diagram to be analyzed of the suspended fiber particles through a single polarization system; generating a color proportion vector of the refractive index difference diagram to be analyzed according to the calculated color proportion of the refractive index difference diagram to be analyzed; calculating a first distance between a color proportion vector of a refractive index difference chart to be analyzed and a color proportion vector of a preset image, wherein the preset image is the refractive index difference chart of suspended fiber particles of unaged insulating oil; and inputting the first distance into a preset model to obtain the polymerization degree, wherein the preset model is a relation model between the distance and the polymerization degree. The invention extracts the color chromaticity characteristic quantity from the refraction difference image of the suspended fiber particles in the insulating oil to evaluate the polymerization degree of the insulating paper in the transformer, does not need the transformer to stop running, takes core by hanging a cover, and is not influenced by the oil filtering, oil changing and the like of the transformer.
Another embodiment of the method for detecting the degree of polymerization of the insulating paper in the transformer according to the present invention is described below with reference to fig. 2, and the embodiment includes:
201. obtaining suspended fiber particles from insulating oil of a transformer, and obtaining a refractive index difference diagram to be analyzed of the suspended fiber particles through a single polarization system;
when the degree of polymerization of the insulation paper of the transformer to be tested needs to be evaluated, suspended fiber particles can be obtained from the insulation oil of the transformer, and a refractivity difference diagram to be analyzed of the suspended fiber particles is obtained through a single polarization system.
202. Determining a plurality of characteristic observation regions of a refractive index difference diagram to be analyzed;
after the refractive index difference chart to be analyzed is obtained, the refractive index difference chart can be divided into a plurality of characteristic observation regions according to preset conditions.
203. Calculating the color proportion of each characteristic observation region, and correspondingly generating a color proportion vector of each characteristic observation region according to the color proportion of each characteristic observation region;
in the present embodiment, the color ratio includes a red color ratio and a blue color ratio. Therefore, the formula for calculating the color ratio of the feature observation region may be:
in the formula, ri、biAs a color ratio of the i-th characteristic observation region, Rj、Gj、BjIs the color component of the jth pixel point, and p is the number of the pixel points.
204. Respectively calculating second distances between each characteristic observation region and the color proportion vector of the preset image, and performing mean value calculation on all the second distances to obtain a first distance between the color proportion vector of the refractive index difference diagram to be analyzed and the color proportion vector of the preset image;
and sequentially calculating a second distance between each characteristic observation region and the color proportion vector of the preset image, wherein the process relates to the following calculation formula:
in the formula, yi＝(ri,bi)TIs the color scale vector of the i-th feature observation region, y0＝(r0,b0)TAs a color scale vector of the preset image, S0Is the covariance.
And after each second distance is obtained, performing mean value calculation on all the second distances to obtain a first distance between the color proportion vector of the refractive index difference diagram to be analyzed and the color proportion vector of the preset image, wherein the first distance is the characteristic colorimetric value of the whole refractive index difference diagram to be analyzed.
The formula for the mean calculation is:
in the formula, viIs the second distance of the ith feature observation region.
205. And inputting the first distance into a preset model to obtain the polymerization degree, wherein the preset model is a relation model between the distance and the polymerization degree.
And finally, inputting the first distance as the input of a preset model, and obtaining the polymerization degree of the transformer insulating paper to be detected after inputting the model.
In this embodiment, the preset model may filter a transformer in the insulating oil at each preset aging stage in advance to obtain suspended fiber particles therein, and then obtain a refractive index difference chart of the suspended fiber particles at each preset aging stage, as shown in fig. 4 to 11, a certain amount of insulating paper is placed in an appropriate amount of transformer oil and aged at 140 ℃ for 0, 4, 7, 10, 22, 35, 60, and 90 days, respectively.
After obtaining the refractive index difference maps of the aging stages, executing the steps 202 to 204 to obtain the training distances of the aging stages, measuring the polymerization degrees of the insulation paper of the aging stages, and fitting the training distances and the polymerization degrees of the insulation paper corresponding to the aging stages, as shown in fig. 12, so as to obtain the preset model:
wherein DP is the degree of polymerization, k1，k2For the fitting coefficient, V is the distance. It should be noted that the training distance, the first distance, and the second distance in this embodiment are mahalanobis distances.
Referring to fig. 3, an embodiment of an apparatus for detecting a degree of polymerization of an insulating paper in a transformer according to the present invention includes:
the obtaining module 301 is configured to obtain suspended fiber particles from insulating oil of a transformer, and obtain a refractive index difference diagram to be analyzed of the suspended fiber particles through a single polarization system;
a generating module 302, configured to generate a color proportion vector of the refractive index difference chart to be analyzed according to the calculated color proportion of the refractive index difference chart to be analyzed;
the calculation module 303 is configured to calculate a first distance between a color proportion vector of the refractive index difference chart to be analyzed and a color proportion vector of a preset image, where the preset image is a refractive index difference chart of suspended fiber particles of unaged insulating oil;
the input module 304 is configured to input the first distance into the preset model to obtain a polymerization degree, where the preset model is a relationship model between the distance and the polymerization degree.
Optionally, the generating module 302 specifically includes:
the determination unit is used for determining a plurality of characteristic observation regions of the refractive index difference diagram to be analyzed;
the calculation unit is used for calculating the color proportion of each characteristic observation area and correspondingly generating a color proportion vector of each characteristic observation area according to the color proportion of each characteristic observation area;
the calculating module 303 is further configured to calculate second distances between the feature observation regions and the color proportion vectors of the preset images, and perform mean calculation on all the second distances to obtain a first distance between the color proportion vector of the refractive index difference diagram to be analyzed and the color proportion vector of the preset image.
Optionally, the color scale includes a red scale and a blue scale.
Optionally, the calculation formula of the color ratio of the feature observation region is as follows:
in the formula, ri、biAs a color ratio of the i-th characteristic observation region, Rj、Gj、BjIs the color component of the jth pixel point, and p is the number of the pixel points.
Optionally, the apparatus for detecting a degree of polymerization of insulating paper in a transformer provided by the present invention further includes:
and the fitting module is used for fitting the training distances corresponding to the suspended fiber particles of the insulating oil in each preset aging stage and the polymerization degree of the insulating paper in each preset aging stage to obtain a preset model.
The optional preset models are:
wherein DP is the degree of polymerization, k1，k2For the fitting coefficient, V is the distance.
Optionally, the training distance, the first distance, and the second distance are mahalanobis distances.
Another embodiment of the apparatus for detecting a degree of polymerization of insulating paper in a transformer according to the present invention includes: a memory, and a processor coupled to the memory;
the processor is configured to execute the method of detecting the degree of polymerization of the insulating paper in the transformer as above based on instructions stored in the memory device.
The present invention also relates to a computer-readable medium having stored thereon a computer program which, when executed by a processor, implements the above method for detecting the degree of polymerization of insulating paper in a transformer.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A method for detecting the polymerization degree of insulating paper in a transformer is characterized by comprising the following steps:
obtaining suspended fiber particles from insulating oil of a transformer, and obtaining a refractive index difference diagram to be analyzed of the suspended fiber particles through a single polarization system;
generating a color proportion vector of the refractive index difference diagram to be analyzed according to the calculated color proportion of the refractive index difference diagram to be analyzed;
calculating a first distance between a color proportion vector of the refractive index difference chart to be analyzed and a color proportion vector of a preset image, wherein the preset image is the refractive index difference chart of suspended fiber particles of unaged insulating oil;
inputting the first distance into a preset model to obtain a polymerization degree, wherein the preset model is a relation model between the distance and the polymerization degree;
the generating of the color proportion vector of the refractive index difference chart to be analyzed according to the calculated color proportion of the refractive index difference chart to be analyzed specifically includes:
determining a plurality of characteristic observation regions of the refractive index difference diagram to be analyzed;
calculating the color proportion of each characteristic observation region, and correspondingly generating a color proportion vector of each characteristic observation region according to the color proportion of each characteristic observation region;
the calculating of the first distance between the color proportion vector of the refractive index difference chart to be analyzed and the color proportion vector of the preset image is specifically as follows:
respectively calculating second distances between each characteristic observation region and the color proportion vector of the preset image, and performing mean value calculation on all the second distances to obtain a first distance between the color proportion vector of the refractive index difference diagram to be analyzed and the color proportion vector of the preset image;
the color proportion comprises a red proportion and a blue proportion;
the calculation formula of the color proportion of the characteristic observation area is as follows:
in the formula, ri、biAs a color ratio of the i-th characteristic observation region, Rj、Gj、BjIs the color component of the jth pixel point, and p is the number of the pixel points.
2. The method for detecting the degree of polymerization of insulating paper in a transformer according to claim 1, further comprising:
and fitting the training distance corresponding to the suspended fiber particles of the insulating oil in each preset aging stage and the polymerization degree of the insulating paper in each preset aging stage to obtain the preset model.
3. The method for detecting the degree of polymerization of insulating paper in a transformer according to claim 2, wherein the method further comprises the step of measuring the degree of polymerization of the insulating paper
Then, the preset model is:
wherein DP is the degree of polymerization, k1，k2For the fitting coefficient, V is the distance.
4. The method for detecting the degree of polymerization of insulating paper in a transformer according to claim 3, wherein the training distance, the first distance, and the second distance are all mahalanobis distances.
5. The utility model provides a degree of polymerization detection device of insulating paper in transformer which characterized in that includes:
the acquisition module is used for acquiring suspended fiber particles from insulating oil of a transformer and acquiring a refractive index difference diagram to be analyzed of the suspended fiber particles through a single polarization system;
the generating module is used for generating a color proportion vector of the refractive index difference chart to be analyzed according to the calculated color proportion of the refractive index difference chart to be analyzed;
the calculation module is used for calculating a first distance between a color proportion vector of the refractive index difference chart to be analyzed and a color proportion vector of a preset image, and the preset image is the refractive index difference chart of suspended fiber particles of unaged insulating oil;
the input module is used for inputting the first distance into a preset model to obtain the polymerization degree, and the preset model is a relation model between the distance and the polymerization degree;
the generating of the color proportion vector of the refractive index difference chart to be analyzed according to the calculated color proportion of the refractive index difference chart to be analyzed specifically includes:
determining a plurality of characteristic observation regions of the refractive index difference diagram to be analyzed;
calculating the color proportion of each characteristic observation region, and correspondingly generating a color proportion vector of each characteristic observation region according to the color proportion of each characteristic observation region;
the calculating of the first distance between the color proportion vector of the refractive index difference chart to be analyzed and the color proportion vector of the preset image is specifically as follows:
respectively calculating second distances between each characteristic observation region and the color proportion vector of the preset image, and performing mean value calculation on all the second distances to obtain a first distance between the color proportion vector of the refractive index difference diagram to be analyzed and the color proportion vector of the preset image;
the color proportion comprises a red proportion and a blue proportion;
the calculation formula of the color proportion of the characteristic observation area is as follows:
in the formula, ri、biAs a color ratio of the i-th characteristic observation region, Rj、Gj、BjIs the color component of the jth pixel point, and p is the number of the pixel points.
6. The utility model provides a degree of polymerization detection device of insulating paper in transformer which characterized in that includes: a memory, and a processor coupled to the memory;
the processor is configured to execute the method of detecting the degree of polymerization of the insulating paper in the transformer according to any one of claims 1 to 4, based on the instructions stored in the memory device.
7. A computer-readable medium on which a computer program is stored, characterized in that the program, when executed by a processor, implements the method for detecting the degree of polymerization of insulating paper in a transformer according to any one of claims 1 to 4.
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| CN112924444A (en) * | 2020-12-30 | 2021-06-08 | 广东电网有限责任公司电力科学研究院 | Aging evaluation method and device for transformer oil insulation paper |
| CN112926191A (en) * | 2020-12-31 | 2021-06-08 | 广东电网有限责任公司电力科学研究院 | Method for evaluating residual life of insulating paper |
| CN113413229B (en) * | 2021-06-04 | 2023-01-06 | 昆明医科大学附属口腔医院 | Digital method for evaluating quality of dental preparation |
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