CN107860980A - A kind of time-frequency domain combines quick dielectric response method of testing - Google Patents
A kind of time-frequency domain combines quick dielectric response method of testing Download PDFInfo
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- CN107860980A CN107860980A CN201710977990.8A CN201710977990A CN107860980A CN 107860980 A CN107860980 A CN 107860980A CN 201710977990 A CN201710977990 A CN 201710977990A CN 107860980 A CN107860980 A CN 107860980A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
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Abstract
The invention discloses a kind of time-frequency domain to combine quick dielectric response method of testing, including：The frequency for obtaining test product to be measured is more than the dielectric and magnetic of setpoint frequency threshold value；Polarization and the depolarization current curve of the test product to be measured are measured using three-electrode method；The electrical conductivity of the test product to be measured is calculated according to the polarization and depolarization current；According to the depolarization current and electrical conductivity, the frequency that the test product to be measured is calculated is less than the dielectric and magnetic of the setpoint frequency threshold value；The frequency of the test product to be measured is more than the dielectric and magnetic of setpoint frequency threshold value and frequency is stitched together less than the dielectric and magnetic of the setpoint frequency threshold value, obtains the dielectric and magnetic of the test product to be measured.Method provided by the invention combines PDC and FDS Dominant Facies, and compared to the time that traditional FDS measuring methods can save 80%, and accurate impression improves a lot.
Description
Technical field
The invention belongs to technical field of insulation detection, is surveyed more particularly, to a kind of time-frequency domain with reference to quick dielectric response
Method for testing.
Background technology
The actual motion life-span of high-tension electricity equipment is often what is determined by the deterioration state of its insulating properties, thus to height
It is very necessary that piezoelectric forces equipment, which periodically carries out insulation diagnosis,.The method of traditional in-site measurement power frequency dielectric dissipation factor is only
The average effect of insulation macroscopically can be reflected, conductance is cannot be distinguished by and be lost and relaxation loss, it is impossible to reflect insulating materials comprehensively
Various microcosmic polarization behaviors.Thus, it is necessary to more comprehensive method of testing is used, a variety of polarization that be directed to medium enter
Row measurement, the time domain or frequency domain characteristic of various polarization parameters are analyzed, so as to reflect the apparatus insulated true shape of high-tension electricity comprehensively
Condition.
Conventional isolation diagnostic method has frequency domain method (Frequency Domain Spectroscopy, FDS), in time domain
Recovery voltage measurement method and polarization/depolarization current method (Polarization＆Depolarization Current, PDC).
Recover voltage measurement method and only study the process of depolarization of medium, the influence factor of conductivity variations can not consider in medium
It is interior.Dielectric response is a kind of effective ways based on time domain and the measurement of frequency domain wide scope with FDS methods, has become diagnosis high pressure and sets
The effective tool of standby state of insulation, FDS methods are to measure the dielectric dissipation factor tan δ (ω) and electric capacity C (ω) under different frequency,
Parameter measurement especially under low frequency and ultralow frequency more can accurately embody the relaxation such as the polarization of medium median surface, interfacial polarization pole
Change feature, reflect the practical development situation of the apparatus insulated aging of high-tension electricity.PDC methods can reduce time of measuring, and FDS rules have
Preferable anti-noise jamming ability.
PDC methods can realize measurement faster, but in higher frequency range, the degree of accuracy is restricted, real
The upper limiting frequency of border application is usually 1Hz.FDS methods can apply to low frequency and high frequency, but for extremely low frequency, it is necessary to very
Long time of measuring.It is therefore desirable to provide a kind of side that can be directed to all frequency ranges and carry out quick dielectric response test
Method.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, rung the invention provides a kind of time-frequency domain with reference to quick dielectric
Method of testing is answered, its object is to be directed to all frequency ranges to carry out quick dielectric response test, thus solves existing skill
Using the technical problem that single method of testing accuracy and testing time are longer in art.
To achieve the above object, the invention provides a kind of time-frequency domain to combine quick dielectric response method of testing, its feature
It is, methods described includes：
The frequency for obtaining test product to be measured is more than the dielectric and magnetic of setpoint frequency threshold value；
Polarization and the depolarization current curve of the test product to be measured are measured using three-electrode method；
The electrical conductivity of the test product to be measured is calculated according to the polarization and depolarization current；
According to the depolarization current and electrical conductivity, the frequency of the test product to be measured is calculated less than the setting frequency
The dielectric and magnetic of rate threshold value；
The frequency of the test product to be measured is more than the dielectric and magnetic of setpoint frequency threshold value and frequency is less than the setpoint frequency
The dielectric and magnetic of threshold value is stitched together, and obtains the dielectric and magnetic of the test product to be measured.
In one embodiment of the present of invention, the conductance of the test product to be measured is calculated according to the polarization and depolarization current
Rate, it is specially：
According to formulaCalculate the conductivityσ0, wherein the t1For polarization electricity
Flow half time to peak, tcFor polarization time, idepolFor depolarization current, C0For geometric capacitance, UcFor polarizing voltage, ε0For dielectric
Constant, ipolFor polarization current.
In one embodiment of the present of invention, according to the depolarization current and electrical conductivity, it is calculated described to be tested
The frequency of product is less than the dielectric and magnetic of the setpoint frequency threshold value, is specially：
According to depolarization current idepolCalculate multipole rate χ (ω) imaginary part part χ " (ω) and real part part χ ' (ω)；
According to the imaginary part part χ " (ω) and real part part χ ' (ω) and the conductivity meter of the multipole rate χ (ω)
Calculate the imaginary part part ε " (ω) and real part part ε ' (ω) of complex dielectric permittivity；
Dielectric and magnetic, wherein ω are calculated according to the imaginary part part ε " (ω) of the complex dielectric permittivity and real part part ε ' (ω)
For frequency.
In one embodiment of the present of invention, imaginary part part χ " (ω) and real part part χ ' (ω) points of multipole rate χ (ω)
It is not：
In one embodiment of the present of invention, the imaginary part part ε " (ω) and real part part ε ' (ω) of complex dielectric permittivity are respectively
For：
In one embodiment of the present of invention, according to the imaginary part part ε " (ω) and real part part ε ' of the complex dielectric permittivity
(ω) calculates dielectric and magnetic, is specially：
In one embodiment of the present of invention, the frequency for obtaining test product to be measured is more than the dielectric frequency of setpoint frequency threshold value
Spectrum, it is specially：It is more than the dielectric and magnetic of setpoint frequency threshold value using the frequency of frequency domain method direct measurement test product to be measured.
In one embodiment of the present of invention, the setpoint frequency threshold value is 0.1Hz.
In one embodiment of the present of invention, the three-electrode method is specially：
High-pressure stage and measurement pole are oppositely arranged, the measurement extremely periphery sets protection pole, in the high-pressure stage and measurement pole
Between place test product to be measured.
In one embodiment of the present of invention, the voltage of the high-pressure stage and measurement interpolar is direct current 200V.
In general, by the contemplated above technical scheme of the present invention compared with prior art, have following beneficial to effect
Fruit：The present invention combines the dielectric response for measuring test product to be measured, including complex dielectric permittivity and dielectric dissipation factor using time-frequency domain；
Obtained after low-frequency range part is by the polarization of PDC methods measurement test product and depolarization current curve through Hamon is approximate, frequency is big
Directly measured by FDS methods in the part of setpoint frequency threshold value, then splice test result at one piece.It is provided by the invention
Method combines PDC and FDS Dominant Facies, compared to the time that traditional FDS measuring methods can save 80%, and antijamming capability
By force, accurate impression improves a lot.
Brief description of the drawings
Fig. 1 is the schematic flow sheet that time-frequency domain combines quick dielectric response method of testing in the embodiment of the present invention；
Fig. 2 is FDS measuring circuits principle schematic in the embodiment of the present invention；
Fig. 3 is FDS measurement results schematic diagram in the embodiment of the present invention；
Fig. 4 is PDC measuring circuits principle schematic in the embodiment of the present invention；
Fig. 5 is PDC measurement results schematic diagram in the embodiment of the present invention；
Fig. 6 is the medium spectrum diagram for splicing to obtain in the embodiment of the present invention；
Fig. 7 is the contrast schematic diagram the time required to different method of testings in the embodiment of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below
Conflict can is not formed each other to be mutually combined.
Measurement faster can realized due to PDC methods, but in higher frequency range, the degree of accuracy receives limit
System, the upper limiting frequency of practical application is usually 1Hz.FDS methods can apply to low frequency and high frequency, but for extremely low frequency,
Need the time of measuring grown very much.Therefore, PDC measurement results are transformed into frequency domain in the present invention, completed with reference to FDS methods whole
The measurement of individual frequency-domain segment.
To achieve these goals, the present invention combines the dielectric response parameter for measuring test product to be measured using time-frequency domain, including
Complex dielectric permittivity and dielectric dissipation factor；In low-frequency range part, (frequency is more than setpoint frequency threshold value, such as 0.1Hz) passes through measurement
Obtained after the polarization of test product to be measured and depolarization current curve through Harmon (Hamon) is approximate, frequency is more than the setpoint frequency threshold
The part direct measurement of value, then by low frequency part and the splicing of the test result of HFS at one piece.
As shown in figure 1, the invention provides a kind of time-frequency domain to combine quick dielectric response method of testing, including：
S1, dielectric and magnetic of the frequency more than setpoint frequency threshold value for obtaining test product to be measured；
Using FDS methods, for example with FDS test circuits as shown in Figure 2, measure test product to be measured and be more than setpoint frequency threshold
The dielectric and magnetic of value.The setpoint frequency threshold value can be set according to demand, such as 0.1Hz is arranged in the embodiment of the present invention,
The measurement range of dielectric and magnetic can also be set according to demand, such as what is measured in the embodiment of the present invention may range from 0.1Hz-
5kHz.Its measurement result is as shown in Figure 3.
S2, polarization and the depolarization current curve for measuring using three-electrode method the test product to be measured；
Specifically, test product to be measured can be positioned in the closed environment of constant temperature and humidity, and be surveyed using three-electrode structure
Amount.Such as PDC test circuits as shown in Figure 4 can be used, in the circuit, it is oppositely arranged high-pressure stage and measurement pole, institute
State measurement extremely periphery and protection pole is set, test product to be measured is placed between the high-pressure stage and measurement pole., can in the embodiment of the present invention
So that polarizing voltage is arranged into DC200V, the depolarising time is 10000s, and test product to be measured is transformer oil paper insulation test piece (this hair
Transformer cellulose insulation cardboard and 25# transformer oil are used in bright embodiment), obtained depolarization current curve such as Fig. 5
It is shown.
S3, the electrical conductivity for calculating according to the polarization and depolarization current the test product to be measured；
After polarization and depolarization current is obtained, formula can be passed throughCalculate oil
Paper insulated electrical conductivity, wherein t1For the time to peak of polarization current half, tcFor polarization time, idepolFor depolarization current, C0To be several
What electric capacity, UcPolarizing voltage, ε0For dielectric constant, ipolFor polarization current.
S4, according to the depolarization current and gained electrical conductivity, the frequency of the test product to be measured is calculated less than described
The dielectric and magnetic of setpoint frequency threshold value；
Then by the approximate depolarization current i of HamondepolRelational expression with multipole rate χ (ω) isDerive the imaginary part part of multipole rate；The pass of imaginary part and real part most afterwards through repolarization rate
SystemDerive the real part part of multipole rate；
Again by relational expression ε ' (ω)=ε of complex dielectric permittivity and multipole rate∞+ χ ' (ω) and
Complex dielectric permittivity is calculated, then by dielectric dissipation factor and the relation of complex dielectric permittivityIt is less than
The dielectric loss curve (such as spectral range is 0.0001Hz-0.1Hz) of the dielectric and magnetic of the setpoint frequency threshold value.
S5, by the frequency of the test product to be measured be more than setpoint frequency threshold value dielectric and magnetic and frequency less than it is described setting frequency
The dielectric and magnetic of rate threshold value is stitched together, and obtains the dielectric and magnetic of the test product to be measured；
Finally by FDS as shown in Figure 2 in the medium spectrum curve and the embodiment of the present invention that are obtained in step S4 test
As a result it is stitched together to obtain final complete medium spectrum curve Fig. 6.
In the embodiment of the present invention, the dielectric response for measuring test product to be measured (paper oil insulation test product) is combined using time-frequency domain,
Including complex dielectric permittivity and dielectric dissipation factor；Passed through after polarization depolarization current curve of the low-frequency range part by measuring test product
Hamon is approximate to be obtained, and frequency is more than 0.1Hz parts direct measurement, then splices test result at one piece.It is provided by the invention
Method combines PDC and FDS Dominant Facies, as shown in fig. 7, can save for 80% time compared to traditional FDS measuring methods, and
Accurate impression improves a lot.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles of the invention etc., all should be included
Within protection scope of the present invention.
Claims (10)
1. a kind of time-frequency domain combines quick dielectric response method of testing, it is characterised in that methods described includes：
The frequency for obtaining test product to be measured is more than the dielectric and magnetic of setpoint frequency threshold value；
Polarization and the depolarization current curve of the test product to be measured are measured using three-electrode method；
The electrical conductivity of the test product to be measured is calculated according to the polarization and depolarization current；
According to the depolarization current and electrical conductivity, the frequency that the test product to be measured is calculated is less than the setpoint frequency threshold
The dielectric and magnetic of value；
The frequency of the test product to be measured is more than the dielectric and magnetic of setpoint frequency threshold value and frequency is less than the setpoint frequency threshold value
Dielectric and magnetic be stitched together, obtain the dielectric and magnetic of the test product to be measured.
2. time-frequency domain as claimed in claim 1 combines quick dielectric response method of testing, it is characterised in that according to the polarization
The electrical conductivity of the test product to be measured is calculated with depolarization current, is specially：
According to formulaCalculate the conductivityσ0, wherein the t1For polarization current half-peak
It is worth time, tcFor polarization time, idepolFor depolarization current, C0For geometric capacitance, UcFor polarizing voltage, ε0For dielectric constant,
ipolFor polarization current.
3. time-frequency domain as claimed in claim 2 combines quick dielectric response method of testing, it is characterised in that goes to pole according to described
Galvanic current and electrical conductivity, the frequency that the test product to be measured is calculated are less than the dielectric and magnetic of the setpoint frequency threshold value, tool
Body is：
According to depolarization current idepolCalculate multipole rate χ (ω) imaginary part part χ " (ω) and real part part χ ' (ω)；
Calculated according to the imaginary part part χ " (ω) of the multipole rate χ (ω) and real part part χ ' (ω) and the conductivity meter
The imaginary part part ε " (ω) and real part part ε ' (ω) of complex dielectric permittivity；
Dielectric and magnetic is calculated according to the imaginary part part ε " (ω) of the complex dielectric permittivity and real part part ε ' (ω), wherein ω is frequency
Rate.
4. time-frequency domain as claimed in claim 3 combines quick dielectric response method of testing, it is characterised in that multipole rate χ
The imaginary part part χ " (ω) and real part part χ ' (ω) of (ω) are respectively：
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5. time-frequency domain as claimed in claim 3 combines quick dielectric response method of testing, it is characterised in that complex dielectric permittivity
Imaginary part part ε " (ω) and real part part ε ' (ω) is respectively：
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6. time-frequency domain as claimed in claim 3 combines quick dielectric response method of testing, it is characterised in that according to multiple Jie
The imaginary part part ε " (ω) and real part part ε ' (ω) of electric constant calculate dielectric and magnetic, are specially：
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7. time-frequency domain as claimed in claim 1 or 2 combines quick dielectric response method of testing, it is characterised in that the acquisition
The frequency of test product to be measured is more than the dielectric and magnetic of setpoint frequency threshold value, is specially：Utilize frequency domain method FDS direct measurements test product to be measured
Frequency be more than setpoint frequency threshold value dielectric and magnetic.
8. time-frequency domain as claimed in claim 1 or 2 combines quick dielectric response method of testing, it is characterised in that the setting
Frequency threshold is 0.1Hz.
9. time-frequency domain as claimed in claim 1 or 2 combines quick dielectric response method of testing, it is characterised in that three electricity
Pole method is specially：
High-pressure stage and measurement pole are oppositely arranged, the measurement extremely periphery sets protection pole, between the high-pressure stage and measurement pole
Place test product to be measured.
10. time-frequency domain as claimed in claim 9 combines quick dielectric response method of testing, it is characterised in that the high-pressure stage
Voltage with measuring interpolar is direct current 200V.
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| CN108828416A (en) * | 2018-06-08 | 2018-11-16 | 西安交通大学 | A kind of crosslinking polyethylene-insulated cable insulation ageing state appraisal procedure based on to derivative analysis method |
| CN110794273A (en) * | 2019-11-19 | 2020-02-14 | 哈尔滨理工大学 | Potential time domain spectrum testing system with high-voltage driving protection electrode |
| CN111208397A (en) * | 2020-02-28 | 2020-05-29 | 重庆大学 | System and method for measuring high-voltage time/frequency domain dielectric response characteristics of power equipment |
| CN111913046A (en) * | 2020-05-27 | 2020-11-10 | 哈尔滨理工大学 | Principle for measuring steady-state relaxation polarizability of insulating dielectric medium based on polarization current time domain spectrum |
| CN112287545A (en) * | 2020-10-29 | 2021-01-29 | 吉林大学 | Time-space division order conductivity modeling and simulating method for two-phase conductive medium |
| CN112698115A (en) * | 2020-12-03 | 2021-04-23 | 华北电力大学 | Electric field distribution determination method and system in multilayer composite medium transient process |
| CN113376440A (en) * | 2020-12-11 | 2021-09-10 | 国网山东省电力公司滨州供电公司 | Integrated measurement device and method for frequency domain dielectric spectrum of overhead line |
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| CN115015684A (en) * | 2022-08-10 | 2022-09-06 | 山东和兑智能科技有限公司 | High-voltage bushing digital evaluation method and system based on time-frequency domain feature fusion |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108828416A (en) * | 2018-06-08 | 2018-11-16 | 西安交通大学 | A kind of crosslinking polyethylene-insulated cable insulation ageing state appraisal procedure based on to derivative analysis method |
| CN110794273A (en) * | 2019-11-19 | 2020-02-14 | 哈尔滨理工大学 | Potential time domain spectrum testing system with high-voltage driving protection electrode |
| CN111208397A (en) * | 2020-02-28 | 2020-05-29 | 重庆大学 | System and method for measuring high-voltage time/frequency domain dielectric response characteristics of power equipment |
| CN111913046A (en) * | 2020-05-27 | 2020-11-10 | 哈尔滨理工大学 | Principle for measuring steady-state relaxation polarizability of insulating dielectric medium based on polarization current time domain spectrum |
| CN112287545A (en) * | 2020-10-29 | 2021-01-29 | 吉林大学 | Time-space division order conductivity modeling and simulating method for two-phase conductive medium |
| CN112287545B (en) * | 2020-10-29 | 2022-07-05 | 吉林大学 | Time-space division order conductivity modeling and simulating method for two-phase conductive medium |
| CN112698115A (en) * | 2020-12-03 | 2021-04-23 | 华北电力大学 | Electric field distribution determination method and system in multilayer composite medium transient process |
| CN112698115B (en) * | 2020-12-03 | 2021-11-23 | 华北电力大学 | Electric field distribution determination method and system in multilayer composite medium transient process |
| CN113376440A (en) * | 2020-12-11 | 2021-09-10 | 国网山东省电力公司滨州供电公司 | Integrated measurement device and method for frequency domain dielectric spectrum of overhead line |
| CN113514739A (en) * | 2021-06-16 | 2021-10-19 | 国网吉林省电力有限公司电力科学研究院 | IWOA-BP algorithm-based oil paper insulation aging evaluation method |
| CN115015684A (en) * | 2022-08-10 | 2022-09-06 | 山东和兑智能科技有限公司 | High-voltage bushing digital evaluation method and system based on time-frequency domain feature fusion |
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