CN108680613A - A method of assessing moisture in insulating paper using complex dielectric permittivity initial slope - Google Patents
A method of assessing moisture in insulating paper using complex dielectric permittivity initial slope Download PDFInfo
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- CN108680613A CN108680613A CN201810368030.6A CN201810368030A CN108680613A CN 108680613 A CN108680613 A CN 108680613A CN 201810368030 A CN201810368030 A CN 201810368030A CN 108680613 A CN108680613 A CN 108680613A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
Abstract
A method of moisture in insulating paper being assessed using complex dielectric permittivity initial slope, this method is by complex dielectric permittivity real part in f=10‑4The absolute value of change rate when Hz | k | the frequency domain character parameter as characterization oilpaper damp degree.The experimental study paper oil insulation test product complex dielectric permittivity of different in moisture content and | k | changing rule, and result of study shows：With the rising of insulating paper moisture M, the complex dielectric permittivity real part ε ' curves of oilpaper test product are in high band translational tendency, and low-frequency range complex dielectric permittivity real part amplitude of variation increases with the rising of moisture, by surveying ε ' f curve matchings, it was found that | k | there is preferably exponential function relation between oilpaper moisture M, it can be used for the qualitative assessment of paper oil insulation damp degree, method proposed by the present invention has operation easier, and to the undamaged feature of inside transformer insulation system, it is more suitable for the assessment of transformer insulated state of making moist.
Description
Technical field
The present invention relates to the insulation condition diagnosis detection for belonging to oil paper insulation electrical equipment and life appraisal fields, especially relate to
A kind of and method for assessing moisture in insulating paper using complex dielectric permittivity initial slope.
Background technology
For oil-immersed transformer as the core equipment in electric system, its operating status is related to the balance of entire power grid
With stabilization, thereby, it is ensured that the safe operation of transformer seems particularly significant.Paper oil insulation is as oil-immersed transformer interior insulation
Primary structure, the wherein damp degree of insulating paper and the quality of paper oil insulation overall performance are closely bound up, studies have shown that moisture contains
The increase of amount can promote the Heat Ageing of insulating paper, and insulating paper can gradually be cracked to form moisture simultaneously in Heat Ageing
The moisture in air is absorbed, the heat ageing cracking process of insulating paper is accelerated, leads to paper oil insulation performance worse and worse, make
The service life for obtaining insulating paper is reduced rapidly.Therefore, seem particularly significant to the quantitative evaluation of paper oil insulation moisture.Tradition
Insulating paper in moisture detection method during sampling, be easy can insulation system is caused to damage, moisture is in cardboard
Between uneven distribution also result in test result inaccuracy.Dielectric spectroscopy method (Frequency Domain
Spectroscopy, FDS) as a kind of lossless Electrical Measurement Technology, paper oil insulation complex dielectric permittivity can be effectively obtained with frequency
The data of rate variation, have very strong anti-interference ability, are more suitable for the field diagnostic of oil-immersed transformer state of insulation and comment
Estimate.
Dielectric constant is that medium applies the response to electric field under electric field outside, and real part represents the degree of polarization of macroscopic view, can have
The size and variable condition of effect reflection polarization intensity, the dielectric response that dielectric externally applies electric field depend greatly on electricity
The frequency of field, and when the frequency for applying electric field outside is higher, dielectric relaxor process can't instantaneously occur, but can postpone foundation
, thus with apply between electric field that there are certain phase differences outside, permittivity ε * (ω) is writing a letter in reply for extra electric field frequency as a result,
Number：ε * (ω)=ε ' (ω)-i ε " (ω), wherein complex dielectric permittivity real part ε ' (ω) indicate the size of polarization intensity, imaginary part ε "
The various steerings polarization that (ω) reflects material internal under high frequency does not catch up with various relaxation polarization caused by high-frequency electric field variation
Loss.It makes moist with paper oil insulation currently, domestic and foreign scholars have carried out the frequency domain characters such as complex dielectric permittivity amount based on FDS measuring technologies
The research of quantitative relationship between degree, the results showed that increasing for moisture can cause insulating inner polarization and relaxation process to become
Change, therefore, monitors the variation of paper oil insulation complex dielectric permittivity, and study the changing rule of its real and imaginary parts respectively, it can be more
The variation of effective analysis paper oil insulation state.
Invention content
In view of the above technical problems, it is more accurately to be made moist to transformer oil paper insulation using the assessment of frequency domain dielectric characterization amount
State, the present invention propose a kind of method for assessing moisture in insulating paper using complex dielectric permittivity initial slope, this method
By complex dielectric permittivity real part in f=10-4The absolute value of change rate when Hz | k |, the frequency domain character as characterization oilpaper damp degree
Parameter.The experimental study paper oil insulation test product complex dielectric permittivity of different in moisture content and | k | changing rule, and result of study
Show：With the rising of insulating paper moisture M, the complex dielectric permittivity real part ε ' curves of oilpaper test product are in become to high band translation
Gesture, and low-frequency range complex dielectric permittivity real part amplitude of variation increases with the rising of moisture, by surveying ε '-f curve matchings,
It was found that | k | there is preferably exponential function relation between oilpaper moisture M, can be used for quantifying for paper oil insulation damp degree and comment
Estimate.The method of the present invention has operation easier, and to the undamaged feature of inside transformer insulation system, is more suitable for transformer
The assessment of humidified insulation state.
The technical solution that the present invention takes is：
A method of moisture in insulating paper being assessed using complex dielectric permittivity initial slope, is included the following steps：
Step 1：Complex dielectric permittivity real part ε ˊ are defined with frequency variation curve in Frequency point f=10-4Initial change when Hz
Rate kcFor the initial slope of complex dielectric permittivity real part, pass through kcTo predict the damp degree of insulating paper in oil-immersed transformer；
Step 2：The built-in electrical insulation structure of oil-immersed transformer is simulated using three electrode assemblies, interrecord structure parameter passes through
Dielectric spectroscopy measuring instrument obtains the multiple capacitance parameter of insulating paper, passes through the calculating of capacitance parameter and dielectric constant and insulation system
Formula obtains change curves of the complex dielectric permittivity real part ε ˊ with frequency, calculates in Frequency point f=10-4Initial rate of change when Hz is exhausted
To value | kc|；
Step 3：The different insulating paper sample of five groups of moistures is prepared for by the method for the natural moisture absorption in the lab,
Measure and calculate the absolute value of complex dielectric permittivity real part ε ˊ initial rate of change | kc|, analysis | kc| between insulating paper damp degree
Quantitative relationship；
Step 4：It is fitted through data | kc| obtain exponential fitting relation function expression formula, letter with insulating paper moisture M
Counting relational expression is | kc|=21770exp (0.4372M), the formula illustrate initial rate of change absolute value | kc| it is smaller, in insulating paper
Water content is also smaller, and the insulation degree of inside transformer is better, available | kc| the water content of quantitative evaluation transformer insulating paper.
In the step 1, test frequency f=10 is defined-4The initial rate of change absolute value of , ε ˊ is when Hz | kc|, it is initial oblique
Rate | kc|=d ε ˊ/df, due to | kc| value range in low-frequency range, value depends on rapid polarization inside empire paper and builds
Vertical process, and the dielectric relaxor process in dielectric and its internal water molecule content are closely related, therefore can incite somebody to action | kc| it is used for
In the paper insulated damp degree assessment of transformer oil.
In the step 1, propose complex dielectric permittivity real part dielectric spectroscopy curve in Frequency point f=10-4It is initial when Hz
Change rate kc, dielectric spectroscopy test is carried out to empire paper sample, obtains preceding the 7 of its complex dielectric permittivity real part frequency domain spectral curve
A measured data point obtains the linear relation of preceding 7 data points, later by frequency f=10- by curve matching4Hz is substituted into
Acquire initial rate of change kc, kcThe process of establishing of empire paper inside rapid polarization is reflected, this kind of polarization is established process and mainly taken
Hydrone content certainly in paper oil insulation medium can be used for assessing the shape that makes moist of oil-immersed transformer paper oil insulation entirety
State.In the step 2, using the built-in electrical insulation structure of three electrode assemblies simulation oil-immersed transformer in laboratory, at room temperature
It measures (about 30 DEG C or so)；In the preparation process of insulating paper moisture test product, experiment material uses thickness about 0.5mm, partly
Diameter is the cellulose ox-hide insulating paper disk and 25# U.S.s power high transformer insulating oil of 65mm, and the insulating paper after drying is exposed to
The natural moisture absorption, is often once weighed after half an hour with Precision Electronics Balance in air, is justified by insulating paper before and after calculating the moisture absorption
It is respectively 0.7%, 1.3%, 2.5%, 3.4% that the quality of piece, which prepares moisture M, 4.2% five groups of insulating paper test products, often
Group test product is formed by stacking by five insulating paper disks.
In the step 2, measuring instrument selects the IDAX-300 dielectric response testers of Megger companies of U.S. production,
It is tested at room temperature, in the preparation process of insulating paper moisture test product, experiment material is using thickness about 0.5mm, radius 65mm
Cellulose ox-hide insulating paper disk and 25# U.S.s power high transformer insulating oil, by the insulating paper after drying be exposed in air from
The right moisture absorption is often once weighed after half an hour with Precision Electronics Balance, and the quality of insulating paper disk before and after the calculating moisture absorption is passed through
It is respectively 0.7%, 1.3%, 2.5%, 3.4% to prepare moisture M, 4.2% five groups of insulating paper test products, every group of test product by
Five insulating paper disks are formed by stacking；
Test equipment parameter setting method：Set AC supply voltage maximum value Umax=200V, highest test frequency fH=
4kHz, minimum test frequency fL=0.1mHz can carry out DATA REASONING.Wherein UmaxIt is surveyed for paper oil insulation dielectric spectroscopy
When examination, general setting value, test frequency range, which is chosen to be 0.1mHz -4kHz, can make measurement range wider, and acquisition information is more rich,
Keep measurement result more reliable.
In the step 3, since paper oil insulation is conventional dielectric, the alternating voltage being applied on paper oil insulation makes in it
There is dielectric relaxor phenomenon in portion, and when media interior polar molecule increases, polarization intensity increases, and will certainly cause dielectric constant
Increase, the slow polarization and rapid polarization in low-frequency range can have sufficient time to establish.But after paper oil insulation makes moist, moisture
Sub- increasing number due to internal polarization majority because moisture causes, and belongs to rapid polarization process, paper oil insulation complex dielectric permittivity
Initial rate of change is caused the rate of ε ' declines faster by the polarized strong influence of moisture.The above analysis is as can be seen that moisture contains
Influence of the variation of amount to complex dielectric permittivity real part ε ' is fairly obvious, and water content has relatively been obtained through experimental data and interpretation of result
M and kcBetween functional relation be：
|kc|=2.177 × 104·exp(0.4372M)
The paper insulated k of transformer oil will be surveyedcThe value of M can be obtained by substituting into above formula, so as to make moist to paper oil insulation
State carries out tentative prediction and assessment.
A kind of method for assessing moisture in insulating paper using complex dielectric permittivity initial slope of the present invention, technique effect is such as
Under：
1, insulating materials can not be destroyed in not suspended core, does not have to analyze under the premise of sampling paper insulated in paper oil insulation
It makes moist state, the insulation performance for accurate evaluation oil paper insulation electrical equipment provides reliable basis.
2, complex dielectric permittivity initial slope proposed by the present invention | kc | it effectively can reliably assess the inside paper of transformer
Humidified insulation degree, operation is easier, and will not be damaged to the insulation system of equipment, is a kind of more preferably transformer insulated
Make moist method for diagnosing status.
Description of the drawings
Fig. 1 is the operating process schematic diagram of the present invention.
Fig. 2 is the actual measurement frequency domain spectrogram of complex dielectric permittivity real part.
Fig. 3 is three electrode assembly schematic diagrames；
In Fig. 3：1- measuring electrodes, 2- high-field electrodes, 3- guard electrodes, 4- transformer oil, 5- insulating paper samples.
Fig. 4 is the M and its complex dielectric permittivity real part initial slope value absolute value of different in moisture test product | kc| matched curve
Figure.
Specific implementation mode
Principle analysis：
A method of moisture in insulating paper being assessed using complex dielectric permittivity initial slope, Binding experiment is ground with theory
Study carefully in the initial slope absolute value and paper oil insulation of complex dielectric permittivity real part dielectric spectroscopy curve between paper insulation moisture
Affecting laws and numerical relation.The alternating voltage applied on the dielectric makes dielectric relaxor phenomenon occur inside dielectric,
When media interior polar molecule increases, polarization intensity increases, and will certainly cause the increase of dielectric constant, the slow pole in low-frequency range
Change and rapid polarization can have sufficient time to establish.But after humidified insulation, hydrone increasing number, since internal polarization is more
Number belongs to rapid polarization process because moisture causes, and the initial rate of change of paper oil insulation complex dielectric permittivity is polarized by moisture
Strong to influence, causing the rates of ε ' declines, faster hydrone increases as a kind of highly polar molecule, quantity so that oilpaper is whole
The polarization intensity of body enhances, due to | kc| be the change rate initial value of complex dielectric permittivity real part ε ', that is, the change rate for the moment ε ' that polarizes,
The value is mainly influenced by rapid polarization process, i.e. the influence of hydrone electrode couple muon polarization, therefore with the increasing of moisture
Greatly, the initial value of ε ' change rates | kc| can gradually it increase.Oilpaper test product under different moisture content M is obtained by fitting | kc| between M
Functional relation, you can be used for the qualitative assessment of paper oil insulation damp degree.
A method of moisture in insulating paper being assessed using complex dielectric permittivity initial slope, is included the following steps：
1) complex dielectric permittivity real part ε ˊ, are defined with frequency variation curve in Frequency point f=10-4Initial rate of change k when Hzc
For the initial slope of complex dielectric permittivity real part, pass through kcTo predict the damp degree of insulating paper in oil-immersed transformer；Through experiment
Verification, kcThere are apparent alternation relationship, moisture M and oilpaper with paper insulated moisture M in transformer oil paper insulation
Humidified insulation degree is closely related, and can assess the paper insulated damp degree of transformer oil.
2) the built-in electrical insulation structure of oil-immersed transformer, is simulated using three electrode assemblies, interrecord structure parameter passes through frequency domain
Dielectric spectra measuring instrument obtains the multiple capacitance parameter of insulating paper, passes through the calculation formula of capacitance parameter and dielectric constant and insulation system
Change curves of the complex dielectric permittivity real part ε ˊ with frequency is obtained, is calculated in Frequency point f=10-4Initial rate of change absolute value when Hz
|kc|；
3) the different insulating paper sample of five groups of moistures, is prepared for by the method for the natural moisture absorption in the lab, is surveyed
Measure and calculate the absolute value of complex dielectric permittivity real part ε ˊ initial rate of change | kc|, analysis | kc| with the amount between insulating paper damp degree
Change relationship；It is analyzed according to experimental data, the alternating voltage applied on the dielectric makes occur polarization relaxation inside dielectric
Henan phenomenon, when media interior polar molecule increases, polarization intensity increases, and will certainly cause the increase of dielectric constant, in low-frequency range
It is slow polarization and rapid polarization can have sufficient time to establish.But after humidified insulation, hydrone increasing number, due to interior
Portion's polarization is most because moisture causes, and belongs to rapid polarization process, and the initial rate of change of paper oil insulation complex dielectric permittivity is by water
Point polarized strong influence, causing the rates of ε ' declines, faster hydrone makes as a kind of highly polar molecule, increasing for quantity
The polarization intensity enhancing for obtaining oilpaper entirety, due to | kc| it is the change rate initial value of complex dielectric permittivity real part ε ', that is, polarize moment ε '
Change rate, which is mainly influenced by rapid polarization process, i.e. the influence of hydrone electrode couple muon polarization, therefore with moisture
The increase of content, the initial value of ε ' change rates | kc| can gradually it increase.It is fitted to obtain oilpaper test product under different moisture content M through data
|kc| the functional relation between M | kc|=21770exp (0.4372M), you can commented for quantifying for paper oil insulation damp degree
Estimate.
As shown in Fig. 2, the actual measurement frequency domain spectrogram of the complex dielectric permittivity real part for the present invention, ε ' is complex dielectric permittivity real part, f
For frequency, M is the moisture in insulating paper, which gives the change between complex dielectric permittivity real part ε ' and frequency
Change trend.Every dielectric spectral line is in f=10-4Slope d ε '/df absolute values when Hz are initial slope | kc|。
The preparation of moisture test product：For convenience of the measurement of sample moisture, every group of sample insulating paper is carried out first abundant
It is weighed after drying and obtains the gross weight of every group of sample, then allow it to be exposed in air the natural moisture absorption (at room temperature), every half an hour
It is weighed once using Precision Electronics Balance, increased weight after its moisture absorption divided by the quality after the moisture absorption, which can be obtained its moisture, to be contained
Amount waits for carrying out FDS tests after test product moisture record.
Build experiment porch：The built-in electrical insulation structure of oil-immersed transformer is simulated using three electrode assemblies, as shown in figure 3,
The IDAX-300 dielectric response testers of Megger companies of measuring instrument U.S. production, measure voltage peak UmaxFor 200V, highest
Test frequency fH=4kHz, minimum test frequency fL=0.1mHz.To prevent the interference of ambient temperature, experiment is in 30 DEG C of perseverance
It is carried out in incubator, before test starts, so that sample is stood 6h in insulating box, so that it is fully warmed-up, it is ensured that test sample
Entirety reaches 30 DEG C.
Fig. 4 is under the different M that survey of the present invention, the complex dielectric permittivity real part initial slope absolute value of Oil-Paper Insulation with
The matched curve of M, it can be seen from the figure that the rising of moisture M can drive initial slope absolute value in insulating paper | kc| it is same
Shi Zeng great.
Due to hydrone increasing number, due to internal polarization majority because moisture causes, and belong to rapid polarization process, oilpaper
The initial rate of change for the complex dielectric permittivity that insulate is caused the rates of ε ' declines faster, therefore multiple by the polarized strong influence of moisture
The absolute value of dielectric constant initial slope | kc| also increase therewith, inquires into its relationship with M below.
Initial slope is with moisture just like minor function relationship：
|kc|=2.177 × 104·exp(0.4372M)；
In formula, | kc| it is the absolute value of complex dielectric permittivity real part dielectric spectroscopy curve initial slope, M is paper oil insulation knot
Paper insulated moisture (hundred-mark system) in structure；
To sum up, obtained the moisture test product ε ' of different M the matched curve of FDS initial segments and | k |, as shown in table 1 below：
Data can be seen that from upper table 1 | kc| gradually increase with the rising for dividing water content M, this is because hydrone
It is a kind of highly polar molecule, quantity increases the polarization intensity enhancing so that oilpaper entirety, due to | kc| it is complex dielectric permittivity
The change rate initial value of real part ε ', that is, the change rate for the moment ε ' that polarizes, the value are mainly influenced by rapid polarization process, i.e. hydrone
The influence of electrode couple muon polarization, thus with the increase of moisture, the initial value of ε ' change rates | kc| gradually increase.
The relative dielectric constant real part of paper oil insulation test product, imaginary part are very sensitive to the moisture of insulating board, with
The raising of moisture, ε ' and ε " gradually increase, and ε '-f curves are intended to high band movement, and complex dielectric permittivity real part ε ' is in f
=10-4~10-2Fall in Hz frequency ranges gradually increases.
The present invention is using the FDS curves of complex dielectric permittivity real part ε ' in f=10-4The slope absolute value of Hz | kc| as to oil
Paper insulation damp degree carries out the frequency domain character parameter of quantitative evaluation, by actual measurement ε '-f curve matchings calculating, acquiring | kc
|, there are good exponential function relations between the value and M, and pass through another group of experimental verification characteristic parameter proposed by the present invention |
kc| the validity when assessing paper oil insulation damp degree can incite somebody to action | kc| the scene inspection of for transformer paper oil insulation damp degree
In survey.The achievement in research of the present invention is it is further proposed that provides new using the initial slope characteristic quantity diagnosing insulation state of making moist
Research Thinking.
Claims (6)
1. a kind of method for assessing moisture in insulating paper using complex dielectric permittivity initial slope, it is characterised in that including following
Step：
Step 1：Complex dielectric permittivity real part ε ˊ are defined with frequency variation curve in Frequency point f=10-4Initial rate of change k when Hzc
For the initial slope of complex dielectric permittivity real part, pass through kcTo predict the damp degree of insulating paper in oil-immersed transformer；
Step 2：The built-in electrical insulation structure of oil-immersed transformer is simulated using three electrode assemblies, interrecord structure parameter passes through frequency domain
Dielectric spectra measuring instrument obtains the multiple capacitance parameter of insulating paper, passes through the calculation formula of capacitance parameter and dielectric constant and insulation system
Change curves of the complex dielectric permittivity real part ε ˊ with frequency is obtained, is calculated in Frequency point f=10-4Initial rate of change absolute value when Hz
|kc|；
Step 3：The different insulating paper sample of five groups of moistures is prepared for by the method for the natural moisture absorption in the lab, is measured
And calculate the absolute value of complex dielectric permittivity real part ε ˊ initial rate of change | kc|, analysis | kc| with the quantization between insulating paper damp degree
Relationship；
Step 4：It is fitted through data | kc| obtain exponential fitting relation function expression formula, functional relation with insulating paper moisture M
Formula is | kc|=21770exp (0.4372M), the formula illustrate initial rate of change absolute value | kc| smaller, water content in insulating paper
Also smaller, the insulation degree of inside transformer is better, utilizes | kc| the water content of quantitative evaluation transformer insulating paper.
2. a kind of method for assessing moisture in insulating paper using complex dielectric permittivity initial slope according to claim 1,
It is characterized in that：In the step 1, test frequency f=10 is defined-4The initial rate of change absolute value of , ε ˊ is when Hz | kc|, initially
Slope | kc|=d ε ˊ/df, due to | kc| value range in low-frequency range, value depends on rapid polarization inside empire paper
Process is established, and the dielectric relaxor process in dielectric and its internal water molecule content are closely related, therefore will | kc| it is used for
In the paper insulated damp degree assessment of transformer oil.
3. a kind of method for assessing moisture in insulating paper using complex dielectric permittivity initial slope according to claim 1,
It is characterized in that：In the step 1, propose complex dielectric permittivity real part dielectric spectroscopy curve in Frequency point f=10-4It is first when Hz
Beginning change rate kc, dielectric spectroscopy test is carried out to empire paper sample, obtains its complex dielectric permittivity real part frequency domain spectral curve
Preceding 7 measured datas point obtains the linear relation of preceding 7 data points, later by frequency f=10 by curve matching-4Hz generations
Enter to acquire initial rate of change kc, kcThe process of establishing of empire paper inside rapid polarization is reflected, it is main that process is established in this kind of polarization
Depending on the hydrone content in paper oil insulation medium, it can be used for assessing the shape that makes moist of oil-immersed transformer paper oil insulation entirety
State.
4. a kind of method for assessing moisture in insulating paper using complex dielectric permittivity initial slope according to claim 1,
It is characterized in that：In the step 2, the built-in electrical insulation structure of oil-immersed transformer is simulated in laboratory using three electrode assemblies,
It measures at room temperature；In the preparation process of insulating paper moisture test product, experiment material is using thickness 0.5mm, radius 65mm
Cellulose ox-hide insulating paper disk and 25# U.S.s power high transformer insulating oil, by the insulating paper after drying be exposed in air from
The right moisture absorption is often once weighed after half an hour with Precision Electronics Balance, and the quality of insulating paper disk before and after the calculating moisture absorption is passed through
It is respectively 0.7%, 1.3%, 2.5%, 3.4% to prepare moisture M, 4.2% five groups of insulating paper test products, every group of test product by
Five insulating paper disks are formed by stacking.
5. a kind of method for assessing moisture in insulating paper using complex dielectric permittivity initial slope according to claim 1,
It is characterized in that：In the step 2, measuring instrument selects the IDAX-300 dielectric responses test of Megger companies of U.S. production
Instrument is tested at room temperature, and in the preparation process of insulating paper moisture test product, experiment material is using thickness about 0.5mm, radius
The cellulose ox-hide insulating paper disk and 25# U.S.s power high transformer insulating oil of 65mm, is exposed to air by the insulating paper after drying
The middle nature moisture absorption, is often once weighed after half an hour with Precision Electronics Balance, and insulating paper disk before and after the calculating moisture absorption is passed through
It is respectively 0.7%, 1.3%, 2.5%, 3.4% that quality, which prepares moisture M, 4.2% five groups of insulating paper test products, every group of examination
Product are formed by stacking by five insulating paper disks；
Test equipment parameter setting method：Set AC supply voltage maximum value Umax=200V, highest test frequency fH=4kHz,
Minimum test frequency fL=0.1mHz, you can carry out DATA REASONING.
6. a kind of method for assessing moisture in insulating paper using complex dielectric permittivity initial slope according to claim 1,
It is characterized in that：In the step 3, water content M and kcBetween functional relation be：
|kc|=2.177 × 104·exp(0.4372M)
The paper insulated k of transformer oil will be surveyedcThe value of M can be obtained by substituting into above formula, so as to paper oil insulation make moist state into
Row tentative prediction and assessment.
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| CN115421013A (en) * | 2022-10-09 | 2022-12-02 | 哈尔滨理工大学 | Insulation damping and aging evaluation method for inverted current transformer |
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