CN108872814A - A kind of high-tension current inductor inside paper oil insulation lifetime estimation method - Google Patents
A kind of high-tension current inductor inside paper oil insulation lifetime estimation method Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- 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 present invention relates to paper oil insulation lifetime estimation methods inside a kind of high-tension current inductor.The present invention provides a kind of effective numerical computation method for paper oil insulation life appraisal inside high-tension current inductor, carries out translation reduction using the paper oil insulation dielectric dissipation factor curve tested under different temperatures of the present invention, obtains temperature shift factor；It is obtained according to temperature shift factor calculated, corresponding moisture content oil immersion cardboard activation energy；The calculating process for repeating oil immersion cardboard activation energy, establishes the relationship of oil immersion cardboard activation energy and moisture content；The reaction Kinetics Model of cellulose aging in paper oil insulation is finally combined, it can accurate evaluation high-tension current inductor inside oil paper insulation ageing state.The present invention realizes the life prediction of different test temperatures, different water cut oilpaper.
Description
Technical field
The invention belongs to paper oil insulation life appraisal field, in particular to paper oil insulation inside a kind of high-tension current inductor
Lifetime estimation method.
Background technique
High-tension current inductor is link in operation of power networks and its important, but due to the influence of long-term complicated running environment
Serious aging, insulation performance will occur for (moisture content, aging temperature etc.), high-tension current inductor inside paper oil insulation part
It substantially reduces, seriously affects the stabilization of power grid, therefore the service life of high-tension current inductor is paper insulated depending on interior oil
Degree of aging, research high-tension current inductor built-in electrical insulation aging life-span assessment algorithm have great importance.
For paper oil insulation class equipment, the reduction degree of the insulating board degree of polymerization becomes the important finger in discriminating device service life
Mark, but for high-tension current inductor equipment, the degree of aging of built-in electrical insulation by sampling and testing assess the service life and
It is complicated, not easy to operate, and since temperature, the difference of moisture content make test result more inaccurate, measurement error is very big,
Therefore now need to high-tension current inductor inside paper oil insulation performance decline degree carry out quantitative analysis, thus accurate evaluation its
Service life.
The method prediction paper oil insulation more provided in the world using ieee standard C57.91 and IEC standard 600767 is surplus
The remaining service life effectively directly insulate according to the trend of hot(test)-spot temperature inside paper oil insulation and the insulating board degree of polymerization
Service life, calculation is simple, but does not consider the influence of the other factors such as water content, calculates service life of paper oil insulation more single
One, effective calculation method is not yet formed at present is used for engineering practice.
Although a kind of method for the ageing state for assessing paper oil insulation of patent of invention CN201310066515- has used frequency temperature
Translation is theoretical, and also by frequency warm translation calculation activation energy, but is primarily used to calculate shift factor, passes through activation energy
Shift factor is indicated with temperature, and further obtains the dielectric loss curve under different temperatures, eliminates the influence of temperature.The patent
Dielectric spectra under main measurement ageing state, by the algebraic relation between the fitting degree of polymerization and dielectric constant and dielectric loss into
The assessment of row ageing state.
Device and its prediction of the patent of invention CN201310134298- transformer oil Aging of Oil-paper Insulation in Oil assessment with life prediction
Degree of polymerization index after method is sample aging to transformer insulating paper and insulating board measures, and carries out to insulating paper mechanical strong
Degree test is analyzed furfural content variation in oil in insulating paper ageing process, is carried out to moisture content in paper and Board ageing process
Test and oil dissolved gas content measuring.Water, oil dissolved gas in the degree of polymerization, mechanical strength, furfural, ageing process is carried out
Detection, and the service life is assessed by these parameters.
Report there is no at present for the life appraisal of the insulating board of initial aqueous rates different under unaged state, therefore existing
Having technology, there is an urgent need for a kind of novel technical solutions in the middle to solve the problems, such as this.
Summary of the invention
The technical problem to be solved by the present invention is to：A kind of high-tension current inductor inside paper oil insulation life appraisal is provided
Method is used to solve not yet to be formed the technical issues of service life effective calculation method of paper oil insulation is for engineering practice at present.
A kind of high-tension current inductor inside paper oil insulation lifetime estimation method, the described method comprises the following steps, and
Following steps sequentially carry out：
Step 1: obtaining dielectric dissipation factor curve of the oilpaper of known aqueous rate under the translation reference temperature of setting；
Obtain dielectric dissipation factor curve of the oilpaper of identical moisture content under the test temperature of setting；
Step 2: bent according to dielectric dissipation factor of the oilpaper of known aqueous rate under translation reference temperature and test temperature
The expression formula of the activation energy Δ E of oilpaper after line, shift factor formula and fitting obtains the shift factor reason of each moisture content oilpaper
By expression formula；
Step 3: carrying out the accelerated aging test under the aging reference temperature of setting to oilpaper, aging is obtained with reference to temperature
Lower oilpaper modal corresponding with ageing time is spent, and draws the ageing time under aging reference temperature and degree of polymerization variation song
Line；
Step 4: according to ageing time and degree of polymerization change curve in step 3, cellulose-binding chemical reaction kinetics
It learns equation and chemical rate equation carries out curve fitting, obtain the phase relation in cellulose chemistry reaction kinetics equation
Number：k2、k10With the value of b, wherein k10For the initial value of reaction rate k (t), k2It is fitting coefficient undetermined with b；
Step 5: by the k of acquisition10Value translated according to the shift factor theoretical expression obtained in step 2, obtain
Reaction rate initial value k ' after must translating10：
Step 6: according to the reaction rate initial value k ' after being translated in step 510And the fitting coefficient k in step 42
And b, the Estimate equation of paper oil insulation service life L is obtained, the high-tension current inductor of known aqueous rate is obtained by solving the equation
Insulation life L assessed value of the internal oilpaper under the test temperature of setting.
Shift factor formula is as follows in the step 2：
Wherein：α is the shift factor under identical moisture content；TrefFor reference temperature, unit is：K；T is test temperature,
Its unit is：K；Δ E is the activation energy of oilpaper；R is generator molecular constant, 8.314J/ (molK).
The activation energy Δ E of oilpaper passes through the matched curve of oilpaper activation energy and moisture content relationship after being fitted in the step 2
It is obtained after fitting, the activation energy Δ E expression formula of oilpaper is after fitting：
Δ E=A exp (w/B)+C
Wherein, Δ E is the activation energy of oilpaper, and w is oilpaper moisture content, and A, B, C are fitting parameter undetermined.
The oilpaper activation energy and the preparation method of the matched curve of moisture content relationship are：
1. being taken on the dielectric dissipation factor curve under the translation reference temperature and test temperature of identical moisture content oilpaper
The test temperature dielectric dissipation factor of same frequency is oilpaper under identical moisture content with the difference of translation blank medium loss factor
The corresponding shift factor value of test temperature；
2. calculating according to shift factor value and shift factor formula by slope, oilpaper under identical moisture content is obtained
Activation energy takes the average value of activation energy for the activation energy Δ E of oilpaper, obtains the activation energy of oilpaper under each moisture content；
3. establishing abscissa is oilpaper moisture content according to the activation energy of oilpaper under each moisture content of acquisition, ordinate is oil
The oilpaper activation energy of paper activation energy and the matched curve of moisture content relationship.
Shift factor theoretical expression is in the step 2：
Wherein：α is the shift factor under corresponding moisture content；TrefFor reference temperature, unit is：K；T is test temperature,
Its unit is：K；Δ E is the activation energy of oilpaper, and R is generator molecular constant, 8.314J/ (molK)；W is oilpaper moisture content；A,
B, C is fitting parameter undetermined.
Cellulose chemistry reaction kinetics equation is in the step 4：
Wherein：DPtFor the degree of polymerization of t moment；DP0For the degree of polymerization of initial time；K (t) is reaction rate；k10For k (t)
Initial value；k2Wherein b is fitting parameter undetermined；T is the reaction time.
Chemical rate equation is in the step 4：
K=Abwexp(-ΔE/RT)
Wherein bwIndicate influence of the moisture content to reaction rate, wherein A, b are fitting parameter undetermined, and T is test temperature,
Unit is：K；Δ E is the activation energy of oilpaper；R is generator molecular constant, 8.314J/ (molK).
Reaction rate initial value k ' after being translated in the step 510For：
k′10=α k10
Wherein, k10For the initial value of k (t), k (t) is reaction rate；
The Estimate equation of acquisition paper oil insulation service life L is in the step 6：
Wherein：DPtFor the degree of polymerization of t moment；DP0For the degree of polymerization of initial time；k10For the initial value of k (t)；K (t) is
Reaction rate；k2For constant；T is the reaction time；α is the shift factor under corresponding moisture content；TrefFor reference temperature, unit
For：K；T is test temperature, and unit is：K；Δ E is the activation energy of oilpaper, and R is generator molecular constant, 8.314J/ (mol
K)；W is oilpaper moisture content；A, B, C, b are fitting parameter undetermined.
A kind of device of high-tension current inductor inside paper oil insulation life appraisal, including：
First obtains module, for obtaining the dielectric dissipation factor curve under translation reference temperature and test temperature；
Second obtains module, the shift factor theoretical expression for obtaining each moisture content oilpaper；
Third obtains module, for obtaining the oilpaper ageing time under aging reference temperature, oil corresponding with ageing time
Paper modal and ageing time and degree of polymerization change curve；
4th obtains module, for obtaining the related coefficient in cellulose chemistry reaction kinetics equation：k2、k10With b's
It is worth, wherein k10For the initial value of reaction rate k (t), k2It is fitting coefficient undetermined with b；
5th obtains module, for the reaction rate initial value k ' after being translated10
6th obtains module, for the Estimate equation by the paper oil insulation service life inside high-tension current inductor, obtains
Know insulation life assessed value of the oilpaper under the test temperature of setting inside the high-tension current inductor of moisture content.
Beneficial effects of the present invention：
The present invention provides a kind of effective numerical computation method for paper oil insulation life appraisal inside high-tension current inductor,
Translation reduction is carried out using the paper oil insulation dielectric dissipation factor curve tested under different temperatures of the present invention, obtains temperature
Shift factor；It is obtained according to temperature shift factor calculated, corresponding moisture content oilpaper activation energy；Repeat the meter of oilpaper activation energy
Calculation process establishes the relationship of oilpaper activation energy and moisture content；Finally combine the kinetics of cellulose aging in paper oil insulation
Model, can accurate evaluation high-tension current inductor inside oil paper insulation ageing state.
The present invention realizes the life prediction of different test temperatures, different water cut oilpaper, obtains one group of accelerated ageing examination
The service life of different aging temperatures, different water cut oilpaper can be inferred after testing by the formula of foundation.
The calculating of shift factor be just suggested before very early be used as frequency temperature translation or when temperature translate.Difference of the invention
The mathematical relationship being between the moisture content and activation energy by finding insulating board, activation energy is replaced with moisture content, into
And shift factor is indicated by moisture content again.And it is real with the reaction rate of shift factor translation cellulose kinetic model
Now to the prediction in oilpaper service life.
Detailed description of the invention：
Fig. 1 is the flow diagram of paper oil insulation lifetime estimation method inside a kind of high-tension current inductor of the present invention；
Fig. 2 is 1.2% oilpaper of moisture content dielectric loss data and corresponding under different test temperatures in the embodiment of the present invention
Matched curve；
Fig. 3 is the activation energy calculated curve of 1.2% oilpaper of moisture content in the embodiment of the present invention；
Fig. 4 is oilpaper activation energy and the matched curve of moisture content relationship in the embodiment of the present invention；
Fig. 5 is in the embodiment of the present invention under 130 DEG C of accelerated aging tests, and the oilpaper degree of polymerization is with ageing time change curve；
Fig. 6 is fibrin reaction kinetics equation matched curve in the embodiment of the present invention.
Specific embodiment
A kind of high-tension current inductor inside paper oil insulation lifetime estimation method, as shown in Figure 1, including the following steps：
Step 1 sets reference temperature, inputs the moisture content of oilpaper, obtains the oilpaper of known aqueous rate under reference temperature
The corresponding dielectric dissipation factor value of each Frequency point, be sequentially connected each value with smoothed curve and obtain medium under translation reference temperature
Loss factor curve；
Test temperature is set, the corresponding dielectric dissipation factor of each Frequency point of oilpaper of identical moisture content under test temperature is obtained
Value is sequentially connected the dielectric dissipation factor curve that each value obtains identical moisture content oilpaper under test temperature with smoothed curve.
The dielectric dissipation factor curve of oilpaper is as shown in Figure 2 under different test temperature, identical moisture content, the medium damage
The abscissa for consuming factors curve is frequency, and ordinate is dielectric dissipation factor.
By the dielectric loss under the dielectric dissipation factor and translation reference temperature under the test temperature of specific frequency point in Fig. 2
Factor takes difference, can calculate the size of its shift factor value under corresponding moisture content；
Shift factor value in step 1 is substituted into shift factor formula, is calculated, be can be obtained identical by slope by step 2
The activation energy of oilpaper under moisture content takes the average value of activation energy for the activation energy Δ E of oilpaper；
The shift factor formula is as follows,
Wherein：α is the shift factor under corresponding moisture content；TrefFor reference temperature, unit is：K；T is test temperature,
Its unit is：K；Δ E is the activation energy of oilpaper；R is generator molecular constant, is worth for 8.314J/ (mol*K)；
Since the activation energy of same cardboard should be identical, by obtaining the activation energy of slope calculating after translation in size
There is a little gap, is calculated by being averaged, obtain its average activation energy, it is believed that average activation energy is the activation energy of oil immersion cardboard
ΔE；
The calculating process of the repeated translation factor and activation energy calculates difference according to the test result under different water cut
The activation energy of moisture content oilpaper establishes the matched curve of oilpaper activation energy Yu its moisture content, oilpaper after matched curve fitting
Activation energy Δ E expression formula is：
Δ E=A exp (w/B)+C
Wherein, Δ E is the activation energy of oilpaper, and w is oilpaper moisture content, and A, B, C are fitting parameter undetermined；
By above-mentioned calculated result, shift factor theoretical expression relevant to test temperature, oilpaper moisture content is established such as
Under；
Wherein α is the shift factor under corresponding moisture content；TrefFor reference temperature, unit is：K；T is test temperature,
Unit is：K；Δ E is the activation energy of oilpaper, and R is generator molecular constant, 8.314J/ (molK)；W is oilpaper moisture content；A,B,
C is fitting parameter undetermined；
Step 3 carries out accelerating thermal aging test to the oilpaper of known aqueous rate, aging reference temperature can sets itself, obtain
The oilpaper ageing time under the aging reference temperature of setting and oilpaper modal corresponding with ageing time are taken, aging is drawn
Time and degree of polymerization change curve,
The abscissa of the ageing time and degree of polymerization change curve is ageing time, and ordinate is the degree of polymerization；
Step 4, according to the test data obtained in step 3, cellulose-binding chemical reaction kinetics equation and chemistry
Reaction rate equation carries out curve fitting, and the related coefficient in cellulose chemistry reaction kinetics equation can be obtained：k2、k10And b,
Wherein k10For the initial value of k (t), k2, b be fitting coefficient undetermined；
The cellulose chemistry reaction kinetics equation is as follows：
Wherein：DPtFor the degree of polymerization of t moment；DP0For the degree of polymerization of initial time；K (t) is degradation rate；k10For k (t)
Initial value；k2For fitting parameter undetermined；T is the reaction time；
The chemical rate equation is：
K=Abwexp(-ΔE/RT)
Wherein bwIndicate influence of the moisture content to reaction rate, wherein A, b are fitting parameter undetermined, and T is test temperature,
Unit is：K；Δ E is the activation energy of oilpaper；R is generator molecular constant, 8.314J/ (molK)；
Step 5, according to the k obtained in step 410Value the shift factor theoretical expression in step 2 is carried out it is flat
It moves, the reaction rate initial value k ' after being translated10：
k′10=α k10
Wherein, k10For the initial value of k (t), k (t) is reaction rate；
Step 6, according to the reaction rate initial value k ' after being translated in step 510With the fitting undetermined obtained in step 4
Coefficient k2, b, obtain paper oil insulation service life L Estimate equation, by solve the equation obtain known aqueous rate high-tension current it is mutual
Insulation life L assessed value of the oilpaper under the test temperature of setting inside sensor；
The Estimate equation of the paper oil insulation service life L is：
Wherein：DPtFor the degree of polymerization of t moment；DP0For the degree of polymerization of initial time；k10For the initial value of k (t)；K (t) is
Reaction rate；k2For constant；T is the reaction time；α is the shift factor under corresponding moisture content；TrefFor reference temperature, unit
For：K；T is test temperature, and unit is：K；Δ E is the activation energy of oilpaper, and R is generator molecular constant, 8.314J/ (mol
K)；W is oilpaper moisture content；A, B, C, b are fitting parameter undetermined.
A kind of device of high-tension current inductor inside paper oil insulation life appraisal, including：
First obtains module, for obtaining the dielectric dissipation factor curve under translation reference temperature and test temperature；
Second obtains module, the shift factor theoretical expression for obtaining each moisture content oilpaper；
The preparation method of the shift factor theoretical expression is：Take under same frequency test temperature dielectric dissipation factor with
The difference of the dielectric dissipation factor of reference temperature obtains the corresponding shift factor value of oilpaper test temperature under identical moisture content；It will put down
It moves factor values and substitutes into shift factor formula, calculated by slope, the activation energy of oilpaper under identical moisture content can be obtained, take activation
The average value that can be worth is the activation energy Δ E of oilpaper；The calculating process of the repeated translation factor and activation energy obtains different water cut oil
The activation energy of paper establishes the matched curve of oilpaper activation energy Yu its moisture content, the activation energy Δ E of oilpaper after matched curve fitting
Expression formula；The activation energy Δ E expression formula of oilpaper after fitting is substituted into shift factor formula, obtains shift factor theoretical expression；
The shift factor formula is as follows,
Wherein：α is the shift factor under corresponding moisture content；TrefFor reference temperature, unit is：K；T is test temperature,
Its unit is：K；Δ E is the activation energy of oilpaper；R is generator molecular constant, is worth for 8.314J/ (mol*K)；
The activation energy Δ E expression formula of oilpaper is after the matched curve fitting：
Δ E=A exp (w/B)+C
Wherein, Δ E is the activation energy of oilpaper, and w is oilpaper moisture content, and A, B, C are fitting parameter undetermined；
Shift factor theoretical expression is as follows；
Wherein α is the shift factor under corresponding moisture content；TrefFor reference temperature, unit is：K；T is test temperature,
Unit is：K；Δ E is the activation energy of oilpaper, and R is generator molecular constant, 8.314J/ (molK)；W is oilpaper moisture content；A,B,
C is fitting parameter undetermined；
Third obtains module, for obtaining the oilpaper ageing time under aging reference temperature, oil corresponding with ageing time
Paper modal and ageing time and degree of polymerization change curve；
4th obtain module, by ageing time and degree of polymerization change curve cellulose-binding chemical reaction kinetics equation and
Chemical rate equation carries out curve fitting, for obtaining the related coefficient in cellulose chemistry reaction kinetics equation：k2、
k10With the value of b, wherein k10For the initial value of reaction rate k (t), k2It is fitting coefficient undetermined with b；
The cellulose chemistry reaction kinetics equation is as follows：
Wherein：DPtFor the degree of polymerization of t moment；DP0For the degree of polymerization of initial time；K (t) is degradation rate；k10For k (t)
Initial value；k2For fitting parameter undetermined；T is the reaction time；
The chemical rate equation is：
K=Abwexp(-ΔE/RT)
Wherein bwIndicate influence of the moisture content to reaction rate, wherein A, b are fitting parameter undetermined, and T is test temperature,
Unit is：K；Δ E is the activation energy of oilpaper；R is generator molecular constant, 8.314J/ (molK)；
5th obtains module, is used for the initial value k of reaction rate k (t)10It is carried out according to shift factor theoretical expression flat
It moves, the reaction rate initial value k ' after being translated10
6th obtains module, the Estimate equation for passing through the paper oil insulation service life, obtains the high-tension current of known aqueous rate
Insulation life assessed value of the oilpaper under the test temperature of setting inside mutual inductor.
The Estimate equation of the paper oil insulation service life L is：
Wherein：DPtFor the degree of polymerization of t moment；DP0For the degree of polymerization of initial time；k10For the initial value of k (t)；K (t) is
Reaction rate；k2For constant；T is the reaction time；α is the shift factor under corresponding moisture content；TrefFor reference temperature, unit
For：K；T is test temperature, and unit is：K；Δ E is the activation energy of oilpaper, and R is generator molecular constant, 8.314J/ (mol
K)；W is oilpaper moisture content；A, B, C, b are fitting parameter undetermined.
The oilpaper is oilpaper inside high-tension current inductor.
Embodiment：
It is as follows to high-tension current inductor inside paper oil insulation life appraisal process：
Oilpaper is made with common insulating board and 45# naphthenic base transformer mineral insulating oil in laboratory conditions, and is allowed
The cardboard nature moisture absorption carries out follow-up test at different in moisture content (0.17%, 1.2%, 2.7%, 3.2%)；
Frequency domain of the above-mentioned different water cut oilpaper at 40 DEG C, 60 DEG C, 80 DEG C, 100 DEG C of temperature is tested with test apparatus to be situated between
It is as shown in Figure 2 now to choose 1.2% oilpaper test curve of moisture content for matter damage curve；It is translation reference temperature with 40 DEG C, respectively will
60 DEG C, 80 DEG C, 100 DEG C of dielectric loss curves progress translation calculations, obtain the shift factor under corresponding test temperature, according to translation
The relationship of the factor and test temperature calculates the activation energy of aqueous oilpaper, and (slope of matched curve can be counted in figure as shown in Figure 3
Calculate the activation energy of aqueous oilpaper)；Repeat above-mentioned aqueous oilpaper activation energy calculation method, obtain different water cut oilpaper (0.17%,
2.7%, 3.2%) activation energy establishes the relationship of oilpaper activation energy and moisture content, as shown in figure 4, can be carried out with exponential equation
Fitting, the Fitting Calculation result are：
Δ E=1.247exp (w/0.01288)+79.45
By above-mentioned calculated result, shift factor theoretical expression relevant to test temperature, oilpaper moisture content is established：
Wherein α is the shift factor under corresponding moisture content；TrefFor reference temperature, unit is：K；T is test temperature,
Unit is：K；R is generator molecular constant, 8.314J/ (molK)；W is oilpaper moisture content.
To obtain the oilpaper lifetime data under accelerated ageing reference temperature, 130 DEG C of acceleration heat are carried out in laboratory conditions
Degradation obtains the oilpaper degree of polymerization with ageing time change curve, as shown in Figure 5；According to 130 DEG C of degradation data, obtain
To data matched curve, as shown in fig. 6, can be obtained in cellulose chemistry reaction kinetics equation according to data fit equation
Related coefficient, wherein：k2=6.72 × 10-5, k10=2.21 × 10-5, b=1.5-1.7, thus obtain with aging temperature, oilpaper
The service life L Estimate equation of oilpaper can be obtained in the related shift factor expression formula of moisture content：
Wherein：DPtFor the degree of polymerization of t moment；DP0For the degree of polymerization of initial time；α be corresponding moisture content under translation because
Son；T is test temperature, and unit is：K；R is generator molecular constant, 8.314J/ (molK)；W is oilpaper moisture content.
When moisture content is 0.5%, and temperature is 70 DEG C, when bringing the service life L Estimate equation of above-mentioned oilpaper into, shift factor meter
Calculate gained：
Service life is calculated as：
Paper oil insulation lifetime estimation method inside a kind of high-tension current inductor according to the present invention can calculate any
The aging life-span of Oil-Paper Insulation under aging temperature, moisture content is obtained by the life appraisal algorithm when moisture content is
0.5%, when temperature is 70 DEG C, the paper oil insulation service life is 30 years, and the service life that corresponding transformer can be run is 30 years, this method
It is of great significance to assessment paper oil insulation service life of equipment.
The present invention is first according to the dielectric dissipation factor curve of oilpaper under a certain moisture content measured at several temperature, setting
Fiducial temperature simultaneously calculates the shift factor under different temperatures dielectric loss curvilinear translation to fiducial temperature according to translation formula, passes through
Shift factor calculates the average activation energy of corresponding oilpaper, repeats above-mentioned experiment, tests the average activation of different moisture content oilpaper
Can, the corresponding relationship of oilpaper activation energy Yu its interior moisture content is thus established, to obtain translation relevant to temperature, water content
The theoretical expression of factor-alpha；Obtain under fiducial temperature that cellulose is old in paper oil insulation secondly by the accelerated aging test of oilpaper
The aging curve for changing reaction, determines the related coefficient in model for the reaction Kinetics Model of test result cellulose-binding, obtains
To the theoretical expression of life model；Finally shift factor α is combined with the life model of oilpaper in paper oil insulation, by anti-
Rate equation is answered, the theoretical expression that can calculate oilpaper service life under different temperatures, different water cut is obtained.
Place is not described in detail by the present invention, is the well-known technique of those skilled in the art of the present technique.Those skilled in the art
It should be appreciated that embodiments herein can provide as method, system or computer program product.Therefore, the application can be used completely
The form of hardware embodiment, complete software embodiment or embodiment combining software and hardware aspects.Moreover, the application can adopt
It wherein include computer-usable storage medium (the including but not limited to magnetic of computer usable program code used in one or more
Disk storage, CD-ROM, optical memory etc.) on the form of computer program product implemented.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Finally it should be noted that：The above examples are only used to illustrate the technical scheme of the present invention rather than to its protection scope
Limitation, although the application is described in detail referring to above-described embodiment, those of ordinary skill in the art should
Understand：Those skilled in the art read the specific embodiment of application can still be carried out after the application various changes, modification or
Person's equivalent replacement, but these changes, modification or equivalent replacement, are applying within pending claims.
Claims (10)
1. paper oil insulation lifetime estimation method inside a kind of high-tension current inductor, which is characterized in that the method includes following
Step, and following steps sequentially carry out：
Step 1: obtaining dielectric dissipation factor curve of the oilpaper of known aqueous rate under the translation reference temperature of setting；It obtains
Dielectric dissipation factor curve of the oilpaper of identical moisture content under the test temperature of setting；
Step 2: according to the oilpaper of known aqueous rate translation reference temperature and test temperature under dielectric dissipation factor curve,
The expression formula of the activation energy Δ E of oilpaper after shift factor formula and fitting, the shift factor for obtaining each moisture content oilpaper are theoretical
Expression formula；
Step 3: carrying out the accelerated aging test under the aging reference temperature of setting to oilpaper, obtain under aging reference temperature
Oilpaper modal corresponding with ageing time, and draw the ageing time under aging reference temperature and degree of polymerization change curve；
Step 4: according to ageing time and degree of polymerization change curve in step 3, cellulose-binding Chemical Kinetics side
Journey and chemical rate equation carry out curve fitting, and obtain the related coefficient in cellulose chemistry reaction kinetics equation：k2、
k10With the value of b, wherein k10For the initial value of reaction rate k (t), k2It is fitting coefficient undetermined with b；
Step 5: by the k of acquisition10Value translated according to the shift factor theoretical expression obtained in step 2, put down
Reaction rate initial value k ' after shifting10；
Step 6: according to the reaction rate initial value k ' after being translated in step 510And the fitting coefficient k in step 42And b,
The Estimate equation for obtaining paper oil insulation service life L is obtained inside the high-tension current inductor of known aqueous rate by the solution equation
Insulation life L assessed value of the oilpaper under the test temperature of setting.
2. paper oil insulation lifetime estimation method inside a kind of high-tension current inductor according to claim 1, feature exist
In：Shift factor formula is as follows in the step 2：
Wherein：α is the shift factor under identical moisture content；TrefFor reference temperature, unit is：K；T is test temperature, list
Position is：K；Δ E is the activation energy of oilpaper；R is generator molecular constant, 8.314J/ (molK).
3. paper oil insulation lifetime estimation method inside a kind of high-tension current inductor according to claim 1, feature exist
In：The activation energy Δ E of oilpaper is fitted by the matched curve of oilpaper activation energy and moisture content relationship after being fitted in the step 2
After obtain, the activation energy Δ E expression formula of oilpaper is after fitting：
Δ E=Aexp (w/B)+C
Wherein, Δ E is the activation energy of oilpaper, and w is oilpaper moisture content, and A, B, C are fitting parameter undetermined.
4. paper oil insulation lifetime estimation method inside a kind of high-tension current inductor according to claim 3, feature exist
In：The oilpaper activation energy and the preparation method of the matched curve of moisture content relationship are：
1. being taken same on the dielectric dissipation factor curve under the translation reference temperature and test temperature of identical moisture content oilpaper
The test temperature dielectric dissipation factor of frequency is that oilpaper is tested under identical moisture content with the difference of translation blank medium loss factor
The corresponding shift factor value of temperature；
2. calculating according to shift factor value and shift factor formula by slope, the activation of oilpaper under identical moisture content is obtained
It can be worth, take the average value of activation energy for the activation energy Δ E of oilpaper, obtain the activation energy of oilpaper under each moisture content；
3. establishing abscissa is oilpaper moisture content according to the activation energy of oilpaper under each moisture content of acquisition, ordinate is living for oilpaper
Change the oilpaper activation energy of energy and the matched curve of moisture content relationship.
5. paper oil insulation lifetime estimation method inside a kind of high-tension current inductor according to claim 1, feature exist
In：Shift factor theoretical expression is in the step 2：
Wherein：α is the shift factor under corresponding moisture content；TrefFor reference temperature, unit is：K；T is test temperature, list
Position is：K；Δ E is the activation energy of oilpaper, and R is generator molecular constant, 8.314J/ (molK)；W is oilpaper moisture content；A,B,C
It is fitting parameter undetermined.
6. paper oil insulation lifetime estimation method inside a kind of high-tension current inductor according to claim 1, feature exist
In：Cellulose chemistry reaction kinetics equation is in the step 4：
Wherein：DPtFor the degree of polymerization of t moment；DP0For the degree of polymerization of initial time；K (t) is reaction rate；k10For the first of k (t)
Initial value；k2Wherein b is fitting parameter undetermined；T is the reaction time.
7. paper oil insulation lifetime estimation method inside a kind of high-tension current inductor according to claim 1, feature exist
In：Chemical rate equation is in the step 4：
K=Abwexp(-ΔE/RT)
Wherein bwIndicate influence of the moisture content to reaction rate, wherein A, b are fitting parameter undetermined, and T is test temperature, unit
For：K；Δ E is the activation energy of oilpaper；R is generator molecular constant, 8.314J/ (molK).
8. paper oil insulation lifetime estimation method inside a kind of high-tension current inductor according to claim 1, feature exist
In：Reaction rate initial value k ' after being translated in the step 510For：
k'10=α k10
Wherein, k10For the initial value of k (t), k (t) is reaction rate.
9. paper oil insulation lifetime estimation method inside a kind of high-tension current inductor according to claim 1, feature exist
In：The Estimate equation of acquisition paper oil insulation service life L is in the step 6：
Wherein：DPtFor the degree of polymerization of t moment；DP0For the degree of polymerization of initial time；k10For the initial value of k (t)；K (t) is reaction
Rate；k2For constant；T is the reaction time；α is the shift factor under corresponding moisture content；TrefFor reference temperature, unit is：K；
T is test temperature, and unit is：K；Δ E is the activation energy of oilpaper, and R is generator molecular constant, 8.314J/ (molK)；W is
Oilpaper moisture content；A, B, C, b are fitting parameter undetermined.
10. the device of paper oil insulation life appraisal inside a kind of high-tension current inductor, it is characterized in that：Including：
First obtains module, for obtaining the dielectric dissipation factor curve under translation reference temperature and test temperature；
Second obtains module, the shift factor theoretical expression for obtaining each moisture content oilpaper；
Third obtain module, for obtain the oilpaper ageing time under aging reference temperature, oilpaper corresponding with ageing time gather
Right value and ageing time and degree of polymerization change curve；
4th obtains module, for obtaining the related coefficient in cellulose chemistry reaction kinetics equation：k2、k10With the value of b,
Middle k10For the initial value of reaction rate k (t), k2It is fitting coefficient undetermined with b；
5th obtains module, for the reaction rate initial value k ' after being translated10
6th obtains module, the Estimate equation for passing through the paper oil insulation service life, obtains the high-tension current mutual inductance of known aqueous rate
Insulation life assessed value of the oilpaper under the test temperature of setting inside device.
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