CN111638429A - Temperature correction method and device for insulating material state evaluation - Google Patents
Temperature correction method and device for insulating material state evaluation Download PDFInfo
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Abstract
The invention provides a temperature correction method and a temperature correction device for insulating material state evaluation, wherein an oiled paper insulating structure of a bushing is simulated by an oil-immersed insulating paperboard, a time translation factor and an amplitude translation factor are extracted according to a PDC curve, a function relation model among temperature, moisture and the translation factors is established by using a depth fitting technology, and temperature correction of different moisture content samples at any test temperature is realized by the model.
Description
Technical Field
The invention relates to the technical field of insulation state evaluation of electrical equipment, in particular to a temperature correction method and a temperature correction device for insulation material state evaluation.
Background
The transformer oiled paper condenser bushing is a core device in the power transmission process, and a main insulation system of the transformer oiled paper condenser bushing is composed of liquid insulation and solid insulation. The deterioration of the solid insulation has the characteristic of being irreversible, so that the quality of the solid insulation of the transformer determines the whole service life of the bushing. The sleeve is not only influenced by a complex electric field and a temperature field in the long-term operation process, but also influenced by external environments such as wind, sunshine and the like, and the factors cause the gradual degradation of the solid insulation of the sleeve. Research shows that the aging of the solid insulation of the sleeve can cause the overall reduction of the insulation performance of the sleeve, so that the stability and the safety of electric energy transmission are reduced, and the normal operation of the whole power grid is even influenced. Therefore, the research on the state evaluation of the solid insulating material of the sleeve has important engineering and academic significance.
In recent years, the application of dielectric response technology based on dielectric theory in the direction of evaluating the insulation state of transformer bushings has received wide attention of scholars. The polarization depolarization current method (PDC) based on the time domain dielectric response technology is widely applied to the research of the evaluation of the solid insulation state of the casing because the PDC has the advantages of rich carried insulation information, simple and convenient measurement, capability of visually reflecting the polarization information of the insulation oil and the insulation paper in a test result, no mutual interference and the like. However, during the dielectric response measurement process in the field of the casing, it is difficult to maintain a certain constant temperature state during the dielectric response test process for the casing due to external conditions such as season, geographical location, weather, and the like. In this case, if the influence of the test temperature on the PDC test curve is disregarded, the resulting state evaluation results will have a non-negligible error. Therefore, the method has important significance for researching the temperature influence rule of the casing solid insulation PDC test result and the temperature correction method thereof.
In order to solve the problems, relevant scholars study the temperature influence rule of the PDC measurement result and provide a corresponding temperature correction method. The main curve technology based on time-temperature superposition is used as a correction model to solve the influence of temperature on a measurement result, and a new idea is provided for relevant research. However, the existing temperature correction models only take temperature as the only factor influencing the PDC test result, and ignore the fact that moisture is also an important factor influencing the dielectric relaxation polarization process. The dielectric response characteristics exhibited by solid insulation of casing with different water content at the same temperature are different regardless of the effect of moisture on the PDC test curve, which also results in large errors in the state evaluation results.
Disclosure of Invention
The invention aims to provide a temperature correction method and a temperature correction device for insulating material state evaluation, which aim to solve the problem that a temperature correction model does not comprehensively consider moisture and temperature in the prior art and improve the accuracy of the evaluation of the solid insulating state of a transformer bushing based on time-domain dielectric response.
To achieve the above technical object, the present invention provides a temperature correction method for insulation material state evaluation, the method comprising the operations of:
simulating an oiled paper insulation structure of the sleeve by using an oil-immersed insulation paperboard;
carrying out time domain dielectric response tests on the insulating paperboards with different moisture contents at different test temperatures to obtain corresponding PDC curves;
translating PDC curves obtained by testing at different temperatures based on a time domain superposition principle to enable the testing curves at different temperatures to be superposed with reference curves at reference temperatures;
recording the coordinate change of the curve before and after translation, and extracting a time translation factor and an amplitude translation factor;
based on the calculation results of the time translation factor and the amplitude translation factor, establishing a functional relation model between the time translation factor and the temperature and the moisture and a functional relation model between the amplitude translation factor and the temperature and the moisture through depth fitting;
and calculating to obtain coordinates of the test curve translated to the reference temperature at any temperature through the functional relation model, and performing temperature correction.
Preferably, the PDC curve is obtained from a dielectric response tester DIRANA test.
Preferably, the translating the PDC curves obtained by the tests at different temperatures specifically includes:
and selecting one of the PDC curves of the same sample tested at different temperatures as a reference temperature, selecting the PDC curve at the temperature as a reference curve, and horizontally translating and vertically translating the test curves at other temperatures to be coincident with the reference curve.
Preferably, the reference temperature is a minimum value of the test temperature.
Preferably, the calculation formula of the time translation factor and the amplitude translation factor is as follows:
τTis a time shift factor, tTTime, t, corresponding to a point on the polarization current curve of the dielectric at a certain temperatureTrefThe time corresponding to the point when the polarization current curve is translated to the reference temperature;
αTas an amplitude translation factor, hTAssigning a value h to the polarization current corresponding to a certain point on the polarization current curve at a certain temperatureTrefThe amplitude of the polarization current corresponding to the point when the sample is translated to the reference temperature.
Preferably, the establishing of the functional relationship model among temperature, moisture and translation factor by depth fitting specifically includes:
the method comprises the steps of establishing three-dimensional space distribution by taking temperature and moisture as independent variables and a translation factor as a dependent variable, respectively using an extreme um function and a Gauss2D function as fitting functions, setting the fitting convergence tolerance to be 1E-20, setting the iteration times to be 100000 times, and calculating the confidence interval of parameters based on progressive symmetry.
The present invention also provides a temperature correction device for insulation material condition evaluation, the device comprising:
the insulating structure simulation module is used for simulating an oiled paper insulating structure of the sleeve by using the oil-immersed insulating paperboard;
the PDC curve acquisition module is used for carrying out time domain dielectric response tests on the insulating paperboards with different moisture contents at different test temperatures to obtain corresponding PDC curves;
the curve translation module is used for translating PDC curves obtained by testing at different temperatures based on a time domain superposition principle so as to enable the testing curves at different temperatures to be superposed with the reference curves at the reference temperatures;
the translation factor extraction module is used for recording the coordinate change of the curve before and after translation and extracting a time translation factor and an amplitude translation factor;
the function model establishing module is used for establishing a function relation model between the time translation factor and the temperature and the moisture and a function relation model between the amplitude translation factor and the temperature and the moisture through depth fitting based on the calculation results of the time translation factor and the amplitude translation factor;
and the temperature correction module is used for calculating the coordinates of the test curve translated to the reference temperature at any temperature through the functional relation model and correcting the temperature.
Preferably, the PDC curve is obtained from a dielectric response tester DIRANA test.
Preferably, the reference temperature is a minimum value of the test temperature.
Preferably, the calculation formula of the time translation factor and the amplitude translation factor is as follows:
τTis a time shift factor, tTTime, t, corresponding to a point on the polarization current curve of the dielectric at a certain temperatureTrefThe time corresponding to the point when the polarization current curve is translated to the reference temperature;
αTas an amplitude translation factor, hTAssigning a value h to the polarization current corresponding to a certain point on the polarization current curve at a certain temperatureTrefThe amplitude of the polarization current corresponding to the point when the sample is translated to the reference temperature.
The effect provided in the summary of the invention is only the effect of the embodiment, not all the effects of the invention, and one of the above technical solutions has the following advantages or beneficial effects:
compared with the prior art, the oil-paper insulation structure of the oil-immersed insulation paperboard simulation bushing is used, the time translation factor and the amplitude translation factor are extracted according to the PDC curve, the functional relation model among temperature, moisture and the translation factors is established by using the depth fitting technology, the temperature correction of different moisture content samples at any test temperature is realized through the model, the temperature correction model can improve the estimation accuracy of the solid insulation state of the bushing of the transformer based on time domain dielectric response, and the temperature correction model has positive significance for the safe and stable operation of the bushing and other electric power equipment.
Drawings
FIG. 1 is a flow chart of a temperature calibration method for insulation material condition evaluation according to an embodiment of the present invention;
FIG. 2 is a graphical representation of PDC curves at different test temperatures for different moisture content samples provided in an example of the present invention;
FIG. 3 is a schematic diagram of the spatial distribution of the time shift factor provided in the embodiment of the present invention;
FIG. 4 is a schematic diagram of a time-shift factor depth-fitting surface provided in an embodiment of the present invention;
FIG. 5 is a schematic diagram of a temperature calibration curve provided in an embodiment of the present invention;
fig. 6 is a block diagram of a temperature correction system for insulation material condition evaluation according to an embodiment of the present invention.
Detailed Description
In order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and procedures are omitted so as to not unnecessarily limit the invention.
A temperature correction method and apparatus for insulation material condition evaluation according to embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the present invention discloses a temperature correction method for insulation material state evaluation, the method comprising the following operations:
simulating an oiled paper insulation structure of the sleeve by using an oil-immersed insulation paperboard;
carrying out time domain dielectric response tests on the insulating paperboards with different moisture contents at different test temperatures to obtain corresponding PDC curves;
translating PDC curves obtained by testing at different temperatures based on a time domain superposition principle to enable the testing curves at different temperatures to be superposed with reference curves at reference temperatures;
recording the coordinate change of the curve before and after translation, and extracting a time translation factor and an amplitude translation factor;
based on the calculation results of the time translation factor and the amplitude translation factor, establishing a functional relation model between the time translation factor and the temperature and the moisture and a functional relation model between the amplitude translation factor and the temperature and the moisture through depth fitting;
and calculating to obtain coordinates of the test curve translated to the reference temperature at any temperature through the functional relation model, and performing temperature correction.
And (3) carrying out drying and oil immersion treatment on the insulating paper board of 0.5mm, and carrying out preparation and data test on an experimental sample by utilizing the oil-immersed insulating paper board to simulate the oiled paper insulating structure of the sleeve.
The time domain dielectric response test of the transformer solid insulation paper board with different initial water content at different temperatures is carried out to obtain the corresponding time domain dielectric spectrum, as shown in figure 2. The transformer solid insulation paper boards with different initial water contents are obtained by absorbing moisture for the insulation paper boards with the same aging degree, namely, the test samples are the insulation paper boards with the same aging degree and different water contents. The PDC curve is obtained by testing a dielectric response tester DIRANA, the amplitude of the test voltage is 200V, the polarization time is set to be 5000 seconds, the temperature of the temperature change test is 45 ℃, 60 ℃, 75 ℃ and 90 ℃, the horizontal axis is a time scale, and the vertical axis is a polarization current value. After each temperature rise, the insulating oil and the insulating paperboard are required to be balanced and kept stand for 48 hours at the target temperature, so that the moisture migration between the insulating oil and the insulating paperboard reaches dynamic balance.
And selecting one of the PDC curves of the same sample tested at different temperatures as a reference temperature, selecting the PDC curve at the temperature as a reference curve, and horizontally translating and vertically translating the test curves at other temperatures to be coincident with the reference curve. Setting the reference temperature as the lowest temperature of the temperature-changing test, namely 45 ℃, setting the polarization current curve at the temperature as the reference curve, setting the test temperatures as 60 ℃, 75 ℃ and 90 ℃, translating the polarization current curve at each test temperature to the right and downwards based on the time-temperature superposition principle until the polarization current curve is basically overlapped with the reference curve, and recording the coordinates of each translated curve.
The coordinate corresponding to a certain point on the curve under different test temperatures before translation is (t)T，hT) The coordinate of the fixed point after translating to the reference temperature is (t)Tref，hTref) Then, the numerical expressions of the time translation factor and the amplitude translation factor can be obtained by analyzing the change condition of the corresponding point coordinates before and after translation:
τTis a time shift factor, tTTime, t, corresponding to a point on the polarization current curve of the dielectric at a certain temperatureTrefThe time corresponding to the point when the polarization current curve is translated to the reference temperature.
αTAs an amplitude translation factor, hTAssigning a value h to the polarization current corresponding to a certain point on the polarization current curve at a certain temperatureTrefThe amplitude of the polarization current corresponding to the point when the sample is translated to the reference temperature.
The results of the moisture content test in fig. 2 were translated and the translation factors were calculated, and the time translation factor and amplitude translation factor calculation results are shown in table 1, taking a sample with a moisture content of 0.81% as an example:
TABLE 1
And establishing a functional relation model among the temperature, the moisture and the translation factor based on the calculation result of the translation factor, and taking the test temperature and the moisture content as independent variables, wherein the three-dimensional space distribution established by taking the time translation factor as a dependent variable is shown in figure 3.
The general model for calculating the translation factor corresponding to any initial water content and test temperature is realized by depth fitting of the spatial scatter distribution rule shown in fig. 3, when the general models for time translation factor and amplitude translation factor are established by the depth fitting technology, the fitting functions respectively use an extreme sum function and a Gauss2D function, the fitting convergence tolerance is set to be 1E-20, the iteration frequency is set to be 100000 times, and the calculation method of the confidence interval of the parameters is based on progressive symmetry, wherein the general models for time translation factor and assignment translation factor corresponding to any initial water content and test temperature obtained by fitting are as shown in tables 2 and 3:
TABLE 2
TABLE 3
Wherein x represents the measurement temperature and has a unit of K, and y represents the moisture content of the measured sample. The equation of the three-dimensional curved surface corresponding to the time translation factor is shown in fig. 4, and any point on the curved surface uniquely corresponds to the translation factor value under a certain temperature and water content (T, mc%).
When the general models shown in the tables 2 and 3 are used for temperature correction of the solid insulation time domain dielectric spectrum of the transformer, corresponding time translation factors and amplitude translation factors can be obtained through calculation by presetting the moisture content and the test temperature. In the embodiment of the invention, four kinds of insulating paper boards with different aging states and moisture contents are selected, and translation factors of the insulating paper boards are calculated through a universal model obtained through fitting, wherein the calculation results of a verification sample with the moisture content of 1.21% are shown in a table 4:
TABLE 4
Substituting the calculation result into the numerical expression of the time translation factor and the amplitude translation factor to calculate the coordinate (t) after the test curve is translated to the reference temperature at any temperatureTref，hTref) And a curve which is drawn by partially utilizing the calculated coordinates and is subjected to temperature influence elimination is shown in fig. 5, wherein the calculated translation curve in the curve is basically superposed with the reference curve, and the feasibility of utilizing the model to correct the temperatures of samples in different insulation states is shown.
According to the embodiment of the invention, the oiled paper insulation structure of the bushing is simulated by the oil-immersed insulation paperboard, the time translation factor and the amplitude translation factor are extracted according to the PDC curve, the functional relation model among temperature, moisture and the translation factor is established by using the depth fitting technology, and the temperature correction of different moisture content samples at any test temperature is realized by the model.
As shown in fig. 6, an embodiment of the present invention further discloses a temperature correction device for insulation material state evaluation, the device including:
the insulating structure simulation module is used for simulating an oiled paper insulating structure of the sleeve by using the oil-immersed insulating paperboard;
the PDC curve acquisition module is used for carrying out time domain dielectric response tests on the insulating paperboards with different moisture contents at different test temperatures to obtain corresponding PDC curves;
the curve translation module is used for translating PDC curves obtained by testing at different temperatures based on a time domain superposition principle so as to enable the testing curves at different temperatures to be superposed with the reference curves at the reference temperatures;
the translation factor extraction module is used for recording the coordinate change of the curve before and after translation and extracting a time translation factor and an amplitude translation factor;
the function model establishing module is used for establishing a function relation model between the time translation factor and the temperature and the moisture and a function relation model between the amplitude translation factor and the temperature and the moisture through depth fitting based on the calculation results of the time translation factor and the amplitude translation factor;
and the temperature correction module is used for calculating the coordinates of the test curve translated to the reference temperature at any temperature through the functional relation model and correcting the temperature.
And (3) carrying out drying and oil immersion treatment on the insulating paper board of 0.5mm, and carrying out preparation and data test on an experimental sample by utilizing the oil-immersed insulating paper board to simulate the oiled paper insulating structure of the sleeve.
Time domain dielectric response tests are carried out on the transformer solid insulation paper boards with different initial water contents at different temperatures to obtain corresponding time domain dielectric spectrums. The transformer solid insulation paper boards with different initial water contents are obtained by absorbing moisture for the insulation paper boards with the same aging degree, namely, the test samples are the insulation paper boards with the same aging degree and different water contents. The PDC curve is obtained by testing a dielectric response tester DIRANA, the amplitude of the test voltage is 200V, the polarization time is set to be 5000 seconds, the temperature of the temperature change test is 45 ℃, 60 ℃, 75 ℃ and 90 ℃, the horizontal axis is a time scale, and the vertical axis is a polarization current value. After each temperature rise, the insulating oil and the insulating paperboard are required to be balanced and kept stand for 48 hours at the target temperature, so that the moisture migration between the insulating oil and the insulating paperboard reaches dynamic balance.
And selecting one of the PDC curves of the same sample tested at different temperatures as a reference temperature, selecting the PDC curve at the temperature as a reference curve, and horizontally translating and vertically translating the test curves at other temperatures to be coincident with the reference curve. Setting the reference temperature as the lowest temperature of the temperature-changing test, namely 45 ℃, setting the polarization current curve at the temperature as the reference curve, setting the test temperatures as 60 ℃, 75 ℃ and 90 ℃, translating the polarization current curve at each test temperature to the right and downwards based on the time-temperature superposition principle until the polarization current curve is basically overlapped with the reference curve, and recording the coordinates of each translated curve.
The coordinate corresponding to a certain point on the curve under different test temperatures before translation is (t)T，hT) The coordinate of the fixed point after translating to the reference temperature is (t)Tref，hTref) Then, the numerical expressions of the time translation factor and the amplitude translation factor can be obtained by analyzing the change condition of the corresponding point coordinates before and after translation:
τTis a time shift factor, tTTime, t, corresponding to a point on the polarization current curve of the dielectric at a certain temperatureTrefThe time corresponding to the point when the polarization current curve is translated to the reference temperature.
αTAs an amplitude translation factor, hTAssigning a value h to the polarization current corresponding to a certain point on the polarization current curve at a certain temperatureTrefThe amplitude of the polarization current corresponding to the point when the sample is translated to the reference temperature.
And translating the moisture content test results respectively, calculating translation factors of the moisture content test results, establishing a functional relation model among the temperature, the moisture and the translation factors based on the calculation results of the translation factors, and taking the test temperature and the moisture content as independent variables.
The general model for calculating the translation factor corresponding to any initial water content and test temperature is realized by depth fitting of a spatial scatter distribution rule, when the general model for time translation factor and amplitude translation factor is established by a depth fitting technology, an ExtemeCum function and a Gauss2D function are respectively used as fitting functions, the fitting convergence tolerance is set to be 1E-20, the iteration times are set to be 100000 times, and the calculation method of the confidence interval of the parameters is based on progressive symmetry.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A temperature correction method for insulation state assessment, characterized in that it comprises the following operations:
simulating an oiled paper insulation structure of the sleeve by using an oil-immersed insulation paperboard;
carrying out time domain dielectric response test on the insulating paperboards with different moisture contents at different temperature test temperatures to obtain corresponding PDC curves;
translating PDC curves obtained by testing at different temperatures based on a time domain superposition principle to enable the testing curves at different temperatures to be superposed with reference curves at reference temperatures;
recording the coordinate change of the curve before and after translation, and extracting a time translation factor and an amplitude translation factor;
based on the calculation results of the time translation factor and the amplitude translation factor, establishing a functional relation model between the time translation factor and the temperature and the moisture and a functional relation model between the amplitude translation factor and the temperature and the moisture through depth fitting;
and calculating to obtain coordinates of the test curve translated to the reference temperature at any temperature through a functional relation model, and performing temperature correction.
2. The temperature correction method for insulation material condition evaluation according to claim 1, wherein the PDC curve is obtained from a dielectric response tester DIRANA test.
3. The temperature correction method for insulation material condition evaluation according to claim 1, wherein the translating PDC curves obtained by testing at different temperatures is specifically:
and selecting one of the PDC curves of the same sample tested at different temperatures as a reference temperature, selecting the PDC curve at the temperature as a reference curve, and horizontally translating and vertically translating the test curves at other temperatures to be coincident with the reference curve.
4. A temperature correction method for insulation material condition evaluation according to claim 3, characterized in that the reference temperature is the minimum value of the test temperature.
5. The temperature correction method for insulation material condition evaluation according to claim 1, wherein the calculation formula of the time shift factor and the amplitude shift factor is as follows:
τTis a time shift factor, tTTime, t, corresponding to a point on the polarization current curve of the dielectric at a certain temperatureTrefThe time corresponding to the point when the polarization current curve is translated to the reference temperature;
αTas an amplitude translation factor, hTAssigning a value h to the polarization current corresponding to a certain point on the polarization current curve at a certain temperatureTrefThe amplitude of the polarization current corresponding to the point when the sample is translated to the reference temperature.
6. The temperature correction method for insulation material condition evaluation according to claim 1, wherein the establishing of the functional relationship model among temperature, moisture and translation factor by depth fitting is specifically:
the method comprises the steps of establishing three-dimensional space distribution by taking temperature and moisture as independent variables and a translation factor as a dependent variable, respectively using an extreme um function and a Gauss2D function as fitting functions, setting the fitting convergence tolerance to be 1E-20, setting the iteration times to be 100000 times, and calculating the confidence interval of parameters based on progressive symmetry.
7. A temperature correction device for insulation material condition assessment, the device comprising:
the insulating structure simulation module is used for simulating an oiled paper insulating structure of the sleeve by using the oil-immersed insulating paperboard;
the PDC curve acquisition module is used for carrying out time domain dielectric response tests on the insulating paperboards with different moisture contents at different test temperatures to obtain corresponding PDC curves;
the curve translation module is used for translating PDC curves obtained by testing at different temperatures based on a time domain superposition principle so as to enable the testing curves at different temperatures to be superposed with the reference curves at the reference temperatures;
the translation factor extraction module is used for recording the coordinate change of the curve before and after translation and extracting a time translation factor and an amplitude translation factor;
the function model establishing module is used for establishing a function relation model between the time translation factor and the temperature and the moisture and a function relation model between the amplitude translation factor and the temperature and the moisture through depth fitting based on the calculation results of the time translation factor and the amplitude translation factor;
and the temperature correction module is used for calculating the coordinates of the test curve translated to the reference temperature at any temperature through the functional relation model and correcting the temperature.
8. The temperature correction device for insulation material condition assessment according to claim 1, wherein said PDC curve is obtained from a dielectric response tester DIRANA test.
9. The temperature correction device for insulation material condition evaluation according to claim 1, wherein the reference temperature is a minimum value of the test temperature.
10. The temperature correction device for insulation material condition evaluation according to claim 1, wherein the calculation formula of the time shift factor and the amplitude shift factor is as follows:
tTis a time shift factor, tTTime, t, corresponding to a point on the polarization current curve of the dielectric at a certain temperatureTrefThe time corresponding to the point when the polarization current curve is translated to the reference temperature;
αTas an amplitude translation factor, hTAssigning a value h to the polarization current corresponding to a certain point on the polarization current curve at a certain temperatureTrefThe amplitude of the polarization current corresponding to the point when the sample is translated to the reference temperature.
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