CN108387824A - A kind of paper oil insulation state evaluating method improving recovery voltage measurement mode - Google Patents
A kind of paper oil insulation state evaluating method improving recovery voltage measurement mode Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
Abstract
A kind of paper oil insulation state evaluating method improving recovery voltage measurement mode, it is the improved recovery voltage measurement method of primary multiple short time continuous discharge of charging for a long time, by realizing automatic collection to the electrometer programming for acquiring return voltage data, the sample of different damp degrees is tested, and picks out the parameter of extension each branch of debye equivalent circuit according to the initial slope that each discharge process measures；Network function analysis is finally combined to calculate the return voltage and initial slope of each electric discharge link；Analysis finds that initial slope calculated value and measured value curve co-insides degree are higher, illustrates that the parameter in the equivalent circuit that the initial slope obtained by this improved recovery voltage measurement method picks out is effective；Meanwhile conventional return voltage simulated on the equivalent circuit using matlab and recycling multiple charge and discharge process.While experimental period is foreshortened to the one third of conventional method or less by the present invention, the return voltage polarized spectrum of reduction can equally assess the state of insulation of transformer oil paper insulation sample.
Description
Technical field
The present invention relates to transformer oil Aging of Oil-paper Insulation in Oil and forecasting technique in life span field, are based especially on a kind of improvement reply
The paper oil insulation state evaluating method of voltage measurement mode.
Background technology
Oil-immersed power transformer has many advantages, such as that higher dielectric strength, longer service life are thus widely used in
In electric system, however transformer is in the process of running, inevitably by electricity, heat, mechanical stress and other environment
The influence of factor causes the insulation performance of medium constantly to deteriorate, and therefore, studies the diagnostic method of transformer oil paper insulation state,
And the state of insulation of transformer is correctly assessed, to ensuring that the safe and stable and reliability service of entire power grid has great theory
And practical significance.
Currently, the diagnostic method for transformer oil paper insulation state is examined by the lossless of theoretical foundation of dielectric response
Disconnected method, wherein return voltage method has benefited from its susceptibility height, contains much information, strong antijamming capability, and is convenient for on-the-spot test,
Thus obtain extensive concern.However traditional return voltage method time of measuring length is a big defect, repeats charge and discharge repeatedly originally
It needs to take considerable time, also needs to measure return voltage peak value in each cycle, more extend time of measuring, it is entire real
The process of testing need to expend 3~5 hours, inefficiency；Some existing improved methods are also mostly to put primary electricity filling primary electricity, weight
It carries out, is intended merely to through its influence rule to characteristic quantity of change charge and discharge time study on the basis of repetition measurement amount multiple periods
Rule, there is no be improved to measurement method from the point of view of shortening experimental period；In addition, traditional recovery voltage measurement method
Directly transformer oil paper insulation state is assessed with the characteristic quantity of measurement, influence of the experimental error to result is very big, and leads
Time constant is that most common insulation diagnosis characteristic quantity, the determination of main time constant directly influence most in recovery voltage measurement method
Whole diagnostic result, it is therefore desirable to accurately determine the peak value corresponding time in polarized spectrum as possible.
Invention content
In order to solve these problems, the purpose of the present invention is to provide a kind of oilpaper improving recovery voltage measurement mode is exhausted
Experimental period is foreshortened to the one third of conventional method or less by edge state evaluating method under the same polarization time.Meanwhile
Equivalent circuit to picking out parameter emulates, and moisture contains in the time to peak and insulating paper of the return voltage polarized spectrum of reduction
There are correspondences between amount, can assess the state of paper oil insulation.
The technical solution that the present invention takes is：
A kind of paper oil insulation state evaluating method improving recovery voltage measurement mode, includes the following steps：
Step 1：Dry insulating paper is exposed into the natural moisture absorption in air in the lab, is then fully soaked in it
In new transformer insulation oil, the experiment sample of different in moisture content is obtained；
Step 2：Transformer oil paper insulation return voltage automated collection systems to 6517B electro static instruments mainly by being written VB journeys
Sequence, controls the automatic switching of high voltage direct current source module and ammeter measurement module therein, realizes charge and discharge and measurement procedure
Loop control, and the automatic collection to transformer oil paper insulation return voltage；
Step 3：Sample is placed in three electrode assemblies and access system, recovery voltage measurement system is opened, is set in parameter
It sets interface to be configured charging voltage, charging time, discharge cycles number, each discharge time, starts electro static instrument, it is initial
Change, start acquisition after system will execute charging link automatically, then according to gradually incremental step-length carry out cycle electric discharge, measure
Process, increment of each measurement links initial time return voltage within the sampling interval are the initial slope of the link；
Step 4：By the initial slope for link of discharging every time during the continuous discharge of acquisition to extending debye equivalent circuit
In the parameter of each branch recognized；
Step 5：After picking out each branch parameters, equivalent circuit is analyzed by network function, utilizes linear circuit
Superposition theorem, the return voltage and its initial slope of link of respectively discharging in more discharge processes can be calculated；By initial slope meter
Calculation value is compared with measured value, the parameter of adjusting and optimizing algorithm so that each electric discharge link is initial oblique during continuous discharge
Rate calculated value and measured value registration are as high as possible, that is, the parameter picked out is reported as precisely as possible.
Step 6：The equivalent circuit of parameter will be picked out, repeatedly the traditional of charge and discharge replys electricity for simulation in matlab
It presses measurement method, programming simulation to go out return voltage polarized spectrum, observes the return voltage pole that the sample of different in moisture content restores
Change and compose presented rule, paper oil insulation state is commented according to time to peak in polarized spectrum and the correspondence of moisture
Estimate, time to peak is bigger, then moisture is more in insulating paper, and state of insulation is poorer.
In the step 4, identification process is as follows：
Capacitance voltage is on branch i after jth time electric discharge：
Wherein, i represents each branch, and j represents each electric discharge link, U0For the charging voltage being arranged before measurement, tcWhen to charge
Between, tdcjFor each discharge time, τiThe time constant for indicating each branch, by the product representation of corresponding branch RC parameters.
Equivalent circuit is analyzed according to circuit characteristic, in conjunction with low of switch, can be built using the initial slope measured
About each branch RC parameters in equivalent circuit and transformer geometric capacitance CgObject function, acquired by optimization algorithm optimal
Solution, is brought into formula
In solve insulation resistance Rg, at this point, Urj(t) it is the second return voltage value measured after j-th of electric discharge link,Indicate the slope of corresponding sampled point.
In the step 5, return voltage and its initial slope calculating are as follows：
After jth time electric discharge, the return voltage general formula that when capacitance independent role on branch i generates is as follows：
Wherein, ucpij(0-) it is open circuit measurement momentary capacitance voltage value, multinomial Nij(s) and Dij(s) equivalent by analyzing
The operational form of circuit equation obtains, coefficient a0,ij、a1,ij、…、an-1,ijAnd b0,ij、b1,ij、…、bn+1,ijWith equivalent circuit
In relating to parameters, be Rpi、Cpi、Cg、RgCombination as a result, analytic process is complicated, obtained using matlab Analysis of programming, and
Find out zero z1、z2、…、zn-1With pole p1、p2、…、pn+1。
It can be obtained by Laplace Transform, after jth time electric discharge, the return voltage that branch i capacitance voltage independent roles generate is:
Wherein, Kr,ijIt represents to Nij(s)/Dij(s) denominator polynomials in do corresponding every term coefficient when factorization,
Number and Dij(s) polynomial exponent number is related, and K is determined with the method for limitsr,ijValue, formula is as follows：
Dij' (s) be Dij(s) single order is led, pr,ijFor pole.
According to superposition theorem, you can after obtaining jth time electric discharge, when the capacitance voltage collective effect of n item branch road, in circuit
The return voltage and its initial slope that both ends generate.
A kind of paper oil insulation state evaluating method improving recovery voltage measurement mode of the present invention, advantage are：
Improved method in addition to having made breakthrough improvement on measurement method, highly shortened experimental period it
Outside, the return voltage polarized spectrum of the equivalent circuit reduction gone out according to the data identification that this method measures, equally can be to different water
The state of insulation of the transformer oil paper insulation sample of point content is assessed, and the polarized spectrum is by more accurate equivalent circuit
It calculates, the error introduced in measurement process greatly reduces, and the result of the time to peak characteristic quantity that extracts assessment is also more
Reliably.
Description of the drawings
Fig. 1 is the flow diagram that the present invention tests.
Fig. 2 is three-electrode system structure chart；
Wherein：V：Voltmeter, 1- transformer oil, 2- top crowns, 3- oil immersion cardboards, 4- bottom crowns.
Fig. 3 is recovery voltage measurement key wiring diagram.
Fig. 4 is the measurement process figure of conventional return voltage method.
Fig. 5 is the measurement process figure for improving return voltage method.
Fig. 6 is extension debye equivalent circuit diagram.
Fig. 7 is the corresponding computing circuit of j-th of 1 capacitance voltage independent role of electric discharge link branch.
Fig. 8 is that calculating return voltage of the sample of 0.7% moisture after 0.1s, 1s, 10s, 100s discharge time is bent
Line chart.
Fig. 9 is the measured value and calculated value comparison diagram of each electric discharge link initial slope during continuous discharge.
Figure 10 is the return voltage polarization spectrogram of each moisture sample of reduction.
Specific implementation mode
A kind of paper oil insulation state evaluating method improving recovery voltage measurement mode,
1), in terms of measurement method：It is realized by a prolonged charging and continuous discharge process of multiple short time,
Compared to it is traditional with the charge and discharge time than 2:1 repeats the recovery voltage measurement method in multiple periods, under the same polarization time
Experimental period shorten to original one third hereinafter, improving conventional efficient；
2), in terms of branch capacitance voltage description：After the change of measurement method, using the tired form for multiplying damped expoential to every
Branch capacitance voltage after secondary discharge process is described, and often puts primary electricity and multiplies one on the basis of a preceding capacitance voltage
Damped expoential, it is progressive；
3), in terms of parameter identification：The initial slope for link of respectively being discharged in the process using the entire continuous discharge measured, with
And the slope of second sampled point recognizes the parameter for extending debye equivalent circuit；
4), in terms of characteristic quantity is assessed in insulation：Return voltage polarized spectrum is calculated using the Equivalent Circuit Parameter picked out
Characteristic quantity of the time to peak as assessment transformer oil paper insulation state, rather than the polarized spectrum directly obtained by measurement data
In main time constant characteristic quantity assessed.
It is described 1) in：The process of primary multiple short time continuous discharge of charging for a long time, under the same polarization time originally
Experimental period can be foreshortened to the one third of conventional method, meanwhile, each measurement links only need to measure first three reply electricity
Pressure value, the return voltage peak value without measuring the link always just terminate, and more improve conventional efficient.
It is described 2) in：Since the discharge process of improved method is repeatedly carried out continuously, multiply decaying using tired
The voltage of each branch capacitance after each discharge process is described such as formula (1) in the form of index.
It is described 3) in：According to the initial slope after link of discharging every time during the entire continuous discharge measured, find out
In effect circuit after the RC parameters and transformer geometric capacitance of each branch, it is taken in formula (2) and solves insulation resistance Rg, this
When, Urj(t) it is the second return voltage value measured after j-th of electric discharge link,Indicate the slope of corresponding sampled point.
It is described 4) in：The experimental results showed that time to peak in the return voltage polarized spectrum of improved method reduction with
The increase of moisture in insulating paper and increase, i.e., by this method restore return voltage polarized spectrum time to peak it is bigger,
Paper oil insulation state is poorer.
As shown in Figure 1, measurement method of the present invention by multiple continuous discharge of once charging for a long time, in same polarization
Between under time of measuring foreshortened into the one third of conventional method hereinafter, the data for improving conventional efficient, and measuring can be compared with
The parameter in extension debye equivalent circuit is accurately picked out, returning after improving measurement method can be calculated according to the equivalent circuit
Complex voltage and its initial slope, meanwhile, conventional recovery voltage measurement method is simulated on the equivalent circuit simulates return voltage
Polarized spectrum can assess the state of insulation of paper oil insulation sample using the time to peak of the polarized spectrum.Specific implementation step
It is as follows：
1) laboratory sample that moisture in insulating paper is respectively 0.7%, 1.3%, 3.4% is prepared in the lab, it will
Sample is positioned in three electrode assemblies shown in Fig. 2 for simulated experiment transformer；
2) according to the key wiring diagram of Fig. 3 measuring systems recovery voltage measurement is opened by experimental transformer access system
System, in parameter setting interface to charging voltage 1000V, charging time 2000s, discharge cycles number 13 times, each discharge time
It is respectively set to 0.1s, 0.2s, 0.5s, 1s, 2s, 5s, 10s, 20s, 50s, 100s, 200s, 500s, 1000s, starts electrostatic
Meter, is initialized, and system will execute charging link automatically after click starts acquisition, and be put according to the discharge time of setting
Electricity, the cyclic process measured, schematic diagram such as Fig. 5, conventional recovery voltage measurement process schematic such as Fig. 4.
The link can be obtained according to each measurement links initial time return voltage increment and the ratio in sampling interval
Initial slope value, the initial slope data that different in moisture content sample measures after each electric discharge link are as follows：
The initial slope that 1 different in moisture content sample of table measures after each electric discharge link
| 0.1s | 0.2s | 0.5s | 1s | 2s | 5s | 10s | 20s | 50s | 100s | 200s | 500s | 1000s | |
| 0.7% | 38.82 | 27.18 | 20.76 | 16.94 | 15.45 | 16.05 | 14.20 | 12.80 | 7.462 | 5.594 | 3.688 | 1.909 | 0.890 |
| 1.3% | 37.46 | 29.78 | 27.64 | 25.68 | 23.42 | 20.14 | 16.10 | 21.78 | 15.69 | 6.29 | 3.91 | 1.92 | 0.38 |
| 3.4% | 41.69 | 29.38 | 23.69 | 20.30 | 17.60 | 15.42 | 13.60 | 20.59 | 16.87 | 7.35 | 4.74 | 2.42 | 1.03 |
3) extension debye equivalent circuit is made of a plurality of RC branch circuit parallel connections, as shown in fig. 6, can in theory very intuitively
Different degrees of medium relaxation process is described, generally can accurately reflect time of day, i.e. n=6 using 6 branches.With
Above-mentioned initial slope combination optimization algorithm can pick out the parameter of each branch in equivalent circuit, and concrete analysis process is as follows：
Capacitance voltage such as formula (1) on branch i, analyzes equivalent circuit according to circuit characteristic after jth time electric discharge,
In conjunction with low of switch, can be built about each branch RC parameters and transformer geometry in equivalent circuit using the initial slope measured
Capacitance CgObject function, optimal solution is acquired by optimization algorithm, is brought into formula (2) and solves insulation resistance Rg, at this point, Urj
(t) it is the second return voltage value measured after j-th of electric discharge link,Indicate the slope of corresponding sampled point.
The parameter in extension debye equivalent circuit is recognized by shuffled frog leaping algorithm, with moisture in insulating paper
For 0.7%, identification result such as following table：
Identification result when 2 moisture 0.7% of table
4) after picking out each branch parameters, equivalent circuit is analyzed by network function, return voltage can be calculated
And its initial slope：
When the capacitance voltage independent role of branch 1, corresponding computing circuit is as shown in fig. 7, other branch independent roles
When voltage source need to only be moved on to corresponding branch road.
As n=6, after jth time electric discharge, return voltage that when capacitance independent role on branch i generates can abbreviation be such as
Lower form：
Wherein, ucpij(0-) it is open circuit measurement momentary capacitance voltage value, multinomial Nij(s) and Dij(s) equivalent by analyzing
The operational form of circuit equation obtains, coefficient a0,ij、a1,ij、…、a5,ijAnd b0,ij、b1,ij、…、b7,ijWith in equivalent circuit
Relating to parameters is Rpi、Cpi、Cg、RgCombination as a result, obtaining finding out zero z and pole p using matlab.
It can be obtained by Laplace Transform, after jth time electric discharge, the return voltage that branch i capacitance voltage independent roles generate is:
Wherein, Kr,ijIt represents to Nij(s)/Dij(s) denominator polynomials in do corresponding every term coefficient when factorization,
Number and Dij(s) polynomial exponent number is related.K is determined with the method for limitsr,ijValue, formula is as follows：
Dij' (s) be Dij(s) single order is led, pr,ijFor pole.
According to superposition theorem, you can after obtaining jth time electric discharge, when the capacitance voltage collective effect of 6 branch roads, in circuit
The return voltage and its initial slope that both ends generate.
Calculating return voltage curve of the sample of 0.7% moisture after 0.1s, 1s, 10s, 100s discharge time is as schemed
8, during calculated continuous discharge the initial slope of each electric discharge link with measure the initial slope comparison such as Fig. 9 obtained, two
Person's registration is 92.52%, illustrates that the return voltage initial slope value of each electric discharge link measured by improved method is distinguished
The parameter for knowing the equivalent circuit is effective, can be insulated during reflected well multiple discharge by the equivalent circuit
The polarization of media interior, process of depolarization theoretically demonstrate the feasibility of the experimental method.It can also further adjustment algorithm
Parameter so that the parameter picked out is reported as precisely as possible.
By charge and discharge than 2 on the equivalent circuit for pick out parameter:1 cycle repeatedly simulates conventional recovery voltage measurement method,
Return voltage polarized spectrum such as Figure 10 of each moisture sample can be simulated by matlab, it can be seen that pass through equivalent circuit
The time to peak of the return voltage polarized spectrum of reduction increases with the increase of moisture in insulating paper, and moisture and oilpaper
There is good correspondences between state of insulation, more demonstrate the effective of the data that improved measurement method obtains
Property, and realize with this measurement method the feasibility of follow-up paper oil insulation status assessment.
In conclusion improved method highly shortened reality in addition to having made breakthrough improvement on measurement method
It tests except the time, the return voltage polarized spectrum of the equivalent circuit reduction gone out according to the data identification that this method measures, it equally can be with
The state of insulation of the transformer oil paper insulation sample of different in moisture content is assessed, and the polarized spectrum is by more accurate
What equivalent circuit calculated, the error introduced in measurement process greatly reduces, the time to peak characteristic quantity assessment extracted
As a result also more reliable.
The application of the present invention is merely to illustrate the present invention, but is not limited to the example above, the improvement carried out on this basis and
Equivalents should all belong to the protection domain of appended claims of the present invention.
Claims (8)
1. a kind of paper oil insulation state evaluating method improving recovery voltage measurement mode, it is characterised in that include the following steps：
Step 1：Dry insulating paper is exposed into the natural moisture absorption in air, then it is fully soaked in new transformer insulation oil
In, obtain the experiment sample of different in moisture content；
Step 2：Transformer oil paper insulation return voltage automated collection systems, by the way that electro static instrument write-in program, control is therein
The automatic switching of high voltage direct current source module and ammeter measurement module realizes charge and discharge and the loop control of measurement procedure, and
To the automatic collection of transformer oil paper insulation return voltage；
Step 3：Sample is placed in three electrode assemblies and access system, recovery voltage measurement system is opened, in parameter setting circle
It is configured in face of charging voltage, charging time, discharge cycles number, each discharge time, starts electro static instrument, initialized,
System will execute charging link automatically after starting acquisition, and the mistake of cycle electric discharge, measurement is then carried out according to gradually incremental step-length
Journey, increment of each measurement links initial time return voltage within the sampling interval are the initial slope of the link；
Step 4：By the initial slope of electric discharge link is each in the equivalent circuit of debye to extending every time during the continuous discharge of acquisition
The parameter of branch is recognized；
Step 5：After picking out each branch parameters, equivalent circuit is analyzed by network function, utilizes the folded of linear circuit
It reorders reason, the return voltage and its initial slope of link of respectively discharging in more discharge processes can be calculated；By initial slope calculated value
It is compared with measured value, the parameter of adjusting and optimizing algorithm so that the initial slope meter of each electric discharge link during continuous discharge
Calculation value and measured value registration are as high as possible, that is, the parameter picked out is reported as precisely as possible；
Step 6：The equivalent circuit of parameter will be picked out, simulation is repeated as many times traditional recovery voltage measurement mode of charge and discharge, compiles
Journey simulates return voltage polarized spectrum, the rule that the return voltage polarized spectrum that the sample of observation different in moisture content restores is presented
Rule, assesses paper oil insulation state according to time to peak in polarized spectrum and the correspondence of moisture, time to peak is got over
Greatly, then moisture is more in insulating paper, and state of insulation is poorer.
2. a kind of paper oil insulation state evaluating method improving recovery voltage measurement mode according to claim 1, feature
It is：In the step 4, parameter identification process is as follows：
Equivalent circuit is analyzed according to circuit characteristic, in conjunction with low of switch, using the initial slope measured can build about
Each branch RC parameters and transformer geometric capacitance C in equivalent circuitgObject function, optimal solution is acquired by optimization algorithm,
It is taken to formula
In solve insulation resistance Rg, at this point, Urj(t) it is the second return voltage value measured after j-th of electric discharge link,
Indicate the slope of corresponding sampled point；
Wherein, i represents each branch, and j represents each electric discharge link, U0For the charging voltage being arranged before measurement, tcFor charging time, tdcj
For each discharge time, τiThe time constant for indicating each branch, by the product representation of corresponding branch RC parameters.
3. a kind of paper oil insulation state evaluating method improving recovery voltage measurement mode according to claim 1, feature
It is：In the step 5, return voltage and its initial slope calculating are as follows：
After jth time electric discharge, return voltage that when capacitance independent role on branch i generates can abbreviation at following form：
Wherein, ucpij(0-) it is open circuit measurement momentary capacitance voltage value, multinomial Nij(s) and Dij(s) pass through analyzing equivalent circuit
The operational form of equation obtains, coefficient a0,ij、a1,ij、…、an-1,ijAnd b0,ij、b1,ij、…、bn+1,ijWith in equivalent circuit
Relating to parameters is Rpi、Cpi、Cg、RgCombination as a result, obtaining that zero z can be found out using matlab1、z2、…、zn-1With pole p1、
p2、…、pn+1；
It can be obtained by Laplace Transform, after jth time electric discharge, the return voltage that capacitance voltage independent role generates on branch i is:
Wherein, Kr,ijIt represents to Nij(s)/Dij(s) denominator polynomials in do corresponding per term coefficient when factorization, number
With Dij(s) polynomial exponent number is related, and K is determined with the method for limitsr,ijValue, formula is as follows：
Dij' (s) be Dij(s) single order is led, pr,ijFor pole；
According to superposition theorem, you can after obtaining jth time electric discharge, when the capacitance voltage collective effect of n item branch road, at circuit both ends
The return voltage and its initial slope of generation.
4. a kind of paper oil insulation state evaluating method improving recovery voltage measurement mode, it is characterised in that：
1), in terms of measurement method：It is realized, is compared by a prolonged charging and continuous discharge process of multiple short time
In it is traditional with the charge and discharge time than 2:1 repeats the recovery voltage measurement method in multiple periods, is tested under the same polarization time
Time shorten to original one third or less；
2), in terms of branch capacitance voltage description：After the change of measurement method, using the tired form for multiplying damped expoential to putting every time
Branch capacitance voltage after electric process is described, and often puts primary electricity and multiplies a decaying on the basis of a preceding capacitance voltage
Index, it is progressive；
3), in terms of parameter identification：Utilize the initial slope of each electric discharge link during the entire continuous discharge measured, Yi Ji
The slope of two sampled points recognizes the parameter for extending debye equivalent circuit；
4), in terms of characteristic quantity is assessed in insulation：The peak value of return voltage polarized spectrum is calculated using the Equivalent Circuit Parameter picked out
Characteristic quantity of the time as assessment transformer oil paper insulation state, rather than directly by the polarized spectrum of measurement data acquisition
Main time constant characteristic quantity is assessed.
5. a kind of paper oil insulation state evaluating method improving recovery voltage measurement mode according to claim 4, feature
It is：
It is described 1) in：The process of primary multiple short time continuous discharge of charging for a long time, originally can under the same polarization time
Experimental period is foreshortened to the one third of conventional method, meanwhile, each measurement links only need to measure first three return voltage value
.
6. according to claim 4 it is a kind of improve recovery voltage measurement mode paper oil insulation state evaluating method, it is described 2)
In：Since the discharge process of improved method is repeatedly carried out continuously, using the tired form for multiplying damped expoential to every
The voltage of each branch capacitance is described after secondary discharge process：
Capacitance voltage is on branch i after jth time electric discharge：
Wherein, i represents each branch, and j represents each electric discharge link, U0For the charging voltage being arranged before measurement, tcFor charging time, tdcj
For each discharge time, τiThe time constant for indicating each branch, by the product representation of corresponding branch RC parameters.
7. according to claim 4 it is a kind of improve recovery voltage measurement mode paper oil insulation state evaluating method, it is described 3)
In：According to the initial slope after link of discharging every time during the entire continuous discharge measured, each branch in equivalent circuit is found out
RC parameters and transformer geometric capacitance after, be taken in formula (1) and solve insulation resistance Rg, at this point, Urj(t) it is j-th
The second return voltage value measured after electric discharge link,Indicate the slope of corresponding sampled point.
8. according to claim 4 it is a kind of improve recovery voltage measurement mode paper oil insulation state evaluating method, it is described 4)
In：Time to peak in the return voltage polarized spectrum of improved method reduction increases with the increase of moisture in insulating paper
Greatly, i.e., the time to peak of the return voltage polarized spectrum restored by this method is bigger, and paper oil insulation state is poorer.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110531230A (en) * | 2019-09-11 | 2019-12-03 | 厦门理工学院 | A kind of transformer oil paper insulation system aging method for diagnosing status |
| CN110542816A (en) * | 2019-09-11 | 2019-12-06 | 厦门理工学院 | method for drawing return voltage polarization spectrum, terminal device and storage medium |
| CN110542840A (en) * | 2019-09-11 | 2019-12-06 | 厦门理工学院 | Return voltage curve drawing method, terminal device and storage medium |
| CN110542815A (en) * | 2019-09-11 | 2019-12-06 | 厦门理工学院 | method for drawing reply voltage initial slope spectral line, terminal device and storage medium |
| CN111830371A (en) * | 2020-01-17 | 2020-10-27 | 哈尔滨理工大学 | Method and system for evaluating aging state of insulating paperboard |
| CN115792522A (en) * | 2022-12-08 | 2023-03-14 | 青岛艾测科技有限公司 | Capacitive load insulation detection method, device and equipment |
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| CN110542840A (en) * | 2019-09-11 | 2019-12-06 | 厦门理工学院 | Return voltage curve drawing method, terminal device and storage medium |
| CN110542815A (en) * | 2019-09-11 | 2019-12-06 | 厦门理工学院 | method for drawing reply voltage initial slope spectral line, terminal device and storage medium |
| CN111830371A (en) * | 2020-01-17 | 2020-10-27 | 哈尔滨理工大学 | Method and system for evaluating aging state of insulating paperboard |
| CN111830371B (en) * | 2020-01-17 | 2022-09-20 | 哈尔滨理工大学 | Method and system for evaluating aging state of insulating paperboard |
| CN115792522A (en) * | 2022-12-08 | 2023-03-14 | 青岛艾测科技有限公司 | Capacitive load insulation detection method, device and equipment |
| CN115792522B (en) * | 2022-12-08 | 2023-07-28 | 青岛艾测科技有限公司 | Capacitive load insulation detection method, device and equipment |
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