CN107957436A - Method for evaluating uneven moisture degree of oil-impregnated paper insulation assembly - Google Patents
Method for evaluating uneven moisture degree of oil-impregnated paper insulation assembly Download PDFInfo
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- 238000009413 insulation Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000012360 testing method Methods 0.000 claims abstract description 30
- 230000003595 spectral effect Effects 0.000 claims description 32
- 238000001566 impedance spectroscopy Methods 0.000 claims description 21
- 239000003990 capacitor Substances 0.000 claims description 5
- 238000001228 spectrum Methods 0.000 claims description 5
- 238000007654 immersion Methods 0.000 claims description 4
- 238000012795 verification Methods 0.000 claims description 3
- 238000001453 impedance spectrum Methods 0.000 abstract 9
- 238000011156 evaluation Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 21
- 238000010586 diagram Methods 0.000 description 10
- 230000006378 damage Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009659 non-destructive testing Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 229910017435 S2 In Inorganic materials 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
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Abstract
The invention provides a method for evaluating the uneven moisture degree of an oil-impregnated paper insulating assembly, which comprises the following steps: step S1, forming a plurality of oil-impregnated paper samples which are uniformly wetted and are not uniformly wetted through a plurality of oil-impregnated paper insulation samples, carrying out frequency domain dielectric spectrum test on each oil-impregnated paper sample to obtain a plurality of first dielectric spectrum curves, and establishing a corresponding relation between each first dielectric spectrum curve and the wetted degree of each oil-impregnated paper sample; and step S2, performing frequency domain dielectric spectrum testing on the actual oil-impregnated paper insulating assembly to obtain a second dielectric spectrum curve, and when the similarity between the second dielectric spectrum curve and one of the first dielectric spectrum curves reaches a preset requirement, taking the moisture degree corresponding to the corresponding first dielectric spectrum curve as the moisture degree of the actual oil-impregnated paper insulating assembly. The invention has the advantages that: the uneven moisture degree of the oil paper insulation is evaluated by utilizing the frequency domain dielectric spectrum characteristic peak, compared with the existing method, the oil paper insulation moisture evaluation accuracy is improved, and more detailed moisture conditions can be obtained.
Description
Technical field
The present invention relates to transmission of electricity detection technique field, especially a kind of uneven damp degree for assessing oil-impregnated paper insulation component
Method.
Background technology
Oil-impregnated paper insulation is one of most common insulating materials of power equipment, is mainly used for oil-immersed transformer, oil-paper
In the insulation system of the equipment such as casing and oil immersed type capacitor.In 110kV and above network system, oil-impregnated paper insulation institute accounting
Example reaches more than 93%.Wherein, for capacitor type bushing as one of typical oil-impregnated paper insulation equipment, it is power transformer
Indispensable external connection component.Not only have the function of winding leads drawing transformer, also take on support and fix
The effect of lead.Data shows that 110kV and above bushing shell for transformer accident occupy certain ratio in total number of accident, and
With increasing for voltage class, the ratio that casing causes the accident rises.And the failure of bushing shell for transformer or damage not only result in
Transformer has a power failure, thereby increases and it is possible to which bushing explosion can be caused to cause transformer damage, and even leading to fire further expands accident scope.
For oil-impregnated paper insulation casing, moisture has obvious acceleration, the higher aging speed of moisture for insulating paper aging
Rate is faster, and insulation paper polymerization degree fall off rate is also substantially accelerated.Therefore the safe and stable operation of casing directly affects whole electricity
The stabilization of net, the diagnosis and evaluating significance to its state of insulation and the model that makes moist are great.
At present, the detection method for moisture in insulating paper has dry weight method, karr-Fei Xiufa, oil-paper water
Balance-dividing curve method etc..The above two measurements, which must sample, to be destroyed apparatus insulated, and weight method is low by karr-take because of measurement accuracy
Xiu Fafa is substituted.Oil-paper water balance curve method measures water content in oil content first, further according to oil-paper water balance curve
Estimate water content in paper, the convenient operation of this method and will not injure apparatus insulated, but measurement accuracy is relatively low.
FDS is utilized existing（Dielectric spectroscopy method）Assess in oil-impregnated paper insulation water content method, usually by water content
It is considered as equivalent water content, and assumes that moisture distribution is uniform.
The content of the invention
The technical problems to be solved by the invention are, there is provided a kind of to assess the uneven by tidal excursion of oil-impregnated paper insulation component
The method of degree, assesses the uneven damp degree of paper oil insulation using dielectric spectroscopy characteristic peak, compared to existing method, improves
Paper oil insulation, which makes moist, assesses accuracy, and can draw more detailed situation of making moist.
In order to solve the above technical problem, the present invention provides a kind of uneven damp degree for assessing oil-impregnated paper insulation component
Method, including：
Step S1, multiple oil-impregnated paper insulation samples uniformly to make moist are combined by different way, form multiple uneven oil that make moist
Impregnated paper sample, and dielectric spectroscopy test is carried out to each non-uniform oil-paper sample that makes moist, obtain multiple first dielectric spectras
Curve, and it is corresponding with the damp degree for the non-uniform oil-paper sample that each makes moist to establish each first dielectric spectral curve
Relation；
Step S2, carries out dielectric spectroscopy test to actual oil-impregnated paper insulation component, obtains the second dielectric spectral curve, when described the
When the similarity of one of two dielectric spectral curves and the first dielectric spectral curve reaches pre-provisioning request, by corresponding first dielectric spectra
Damp degree of the corresponding damp degree of curve as the actual oil immersion insulation assembly.
Further included before the step S1：Step S0, makes the different multiple oil-paper uniformly to make moist of damp degree
Insulated sample, and dielectric spectroscopy test is carried out to each oil-impregnated paper insulation sample uniformly to make moist, obtain multiple 3rd dielectrics
Spectral curve.
Further included after the step S1：Obtain each oil-impregnated paper insulation uniformly to make moist in each stack combinations
The equivalent impedance value of the dielectric spectral curve of sample；According to acquisition each impedance of oil-impregnated paper insulation sample for uniformly making moist etc.
Valid value calculates the dielectric loss curve of each stack combinations；And obtained in the dielectric curve verification step S1 for passing through the calculating
The first dielectric spectral curve accuracy.
Wherein, the damp degree of the different oil-impregnated paper insulation samples uniformly to make moist is different.
Wherein, the oil-impregnated paper insulation component is used for the equipment such as oil-immersed transformer, oilpaper casing and oil immersed type capacitor
In.
Wherein, it is that input voltage is 200V's at 40 degree that dielectric spectroscopy test is carried out in the step S1 and step S2
In the case of carry out.
Wherein, the thickness of the uneven oil-paper sample that makes moist after multiple oil-impregnated paper insulation sample combinations uniformly made moist with
The thickness of the single oil-paper sample uniformly to make moist is identical.
The beneficial effect of the embodiment of the present invention is：
The embodiment of the present invention is by assessing the uneven damp degree of oil-impregnated paper insulation sample, on the one hand, it is exhausted to improve oilpaper
Edge, which makes moist, assesses accuracy, and can draw more detailed situation of making moist；On the one hand, compared with dry weight method, the present invention can
To significantly improve the precision of test, and specific moisture distributing state can be obtained；On the other hand, with karr-Fei Xiufa phases
Than the present invention can realize non-destructive testing, to sample or oil paper insulation electrical equipment without destruction and test process convenient quickly.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of one embodiment flow signal of the method for the uneven damp degree for assessing oil-impregnated paper insulation component
Figure.
Fig. 2 is that a kind of another embodiment flow of the method for the uneven damp degree for assessing oil-impregnated paper insulation component is shown
It is intended to.
Fig. 3 is another embodiment schematic diagram of the tan δ-f curves under different moisture content in the present invention.
Fig. 4 is another embodiment schematic diagram of the C '-f curves under different moisture content in the present invention.
Fig. 5 is another embodiment schematic diagram of the C "-f curves under different moisture content in the present invention.
Fig. 6 is another characteristic embodiment schematic diagram of tan δ-f of equivalent water content 2% in the present invention.
Fig. 7 is another characteristic embodiment schematic diagram of tan δ-f of equivalent water content 3% in the present invention.
Fig. 8 is another characteristic embodiment schematic diagram of tan δ-f of equivalent water content 4% in the present invention.
Fig. 9 is another embodiment schematic diagram of double-deck paper oil insulation equivalent circuit diagram in the present invention.
Embodiment
The embodiment of the present invention is illustrated below in conjunction with the accompanying drawings.
Fig. 1 is a kind of one embodiment of the method for the uneven damp degree of assessment oil-impregnated paper insulation component of the present invention
Flow diagram.Applicable object of the present invention is the insulation of the equipment such as oil-immersed transformer, oilpaper casing and oil immersed type capacitor
System.
Step S1, the multiple oil-impregnated paper insulation sample uniformly to make moist is combined by different way, forms multiple make moist
Uneven oil-paper sample, and carry out dielectric spectroscopy test to each non-uniform oil-paper sample of making moist, obtains multiple the
One dielectric spectral curve, and each first dielectric spectral curve is established with the non-uniform oil-paper sample that each makes moist by tidal excursion
The correspondence of degree.
Step S2, carries out dielectric spectroscopy test to actual oil-impregnated paper insulation component, obtains the second dielectric spectral curve, work as institute
When stating the similarity of one of the second dielectric spectral curve and the first dielectric spectral curve and reaching pre-provisioning request, corresponding first is situated between
Damp degree of the corresponding damp degree of electric spectral curve as the actual oil immersion insulation assembly.
Fig. 2 is a kind of another implementation of the method for the uneven damp degree of assessment oil-impregnated paper insulation component of the present invention
The flow diagram of example, the method may include：
Step S0, make the different multiple oil-impregnated paper insulation samples uniformly to make moist of damp degree, and uniformly makes moist to each
Oil-impregnated paper insulation sample carries out dielectric spectroscopy test, and the dielectric for obtaining multiple oil-impregnated paper insulation samples uniformly to make moist is set a song to music
Line.
Step S1, the multiple oil-impregnated paper insulation sample uniformly to make moist is combined by different way, forms multiple make moist
Uneven oil-paper sample, and carry out dielectric spectroscopy test to each non-uniform oil-paper sample of making moist, obtains multiple the
One dielectric spectral curve, and each first dielectric spectral curve is established with the non-uniform oil-paper sample that each makes moist by tidal excursion
The correspondence of degree；
Step S11, the dielectric spectral curve for the oil-impregnated paper insulation sample that each obtained in each stack combinations is uniformly made moist
Equivalent impedance value, each superposition is calculated according to acquisition each equivalent impedance value of oil-impregnated paper insulation sample for uniformly making moist
The dielectric loss curve of combination, and the first dielectric spectral curve obtained in the dielectric curve verification step S1 for passing through the calculating
Accuracy.
Step S2, carries out dielectric spectroscopy test to actual oil-impregnated paper insulation component, obtains the second dielectric spectral curve, work as institute
When stating the similarity of one of the second dielectric spectral curve and the first dielectric spectral curve and reaching pre-provisioning request, corresponding first is situated between
Damp degree of the corresponding damp degree of electric spectral curve as the actual oil immersion insulation assembly.
With reference to a specific example, one is done to the damp degree appraisal procedure of the oil-impregnated paper insulation component of the present invention
A detailed description.
In step so), can prepare initial water content is：It is dry（dry）, 1%, 2%, 3%, 4%, 5%, 6% uniformly make moist
Oilpaper element stack sample.It 6% is what manual humidification obtained that wherein water content, which is, and running equipment will not usually make moist so
Seriously, in order to observe water content it is larger when Water retention whether with water content it is relatively low when have preferable uniformity,
More data points are provided for assessment curve to improve fitting precision.Obtain different moisture content（<0.5%、1%、2%、3%、4%、5%
With 6%）Element stack oil-paper test product, carry out dielectric spectroscopy test, frequency range is 1mHz ~ 5kHz, test temperature 40
DEG C, test voltage peak value is 200V.The dielectric spectral curve of acquisition is as shown in Fig. 3, Fig. 4 and Fig. 5.
In step sl, sample combination uniformly is made moist into the uneven paper oil insulation sample to make moist more than, go forward side by side
Row dielectric spectroscopy is tested, and obtains the corresponding dielectric spectral curve of different unevennesses.As an example, cable paper unit can be folded
Layer reconfigure for element stack that equivalent water content is 2%, 3%, 4% and keep with combine before element stack thickness, specifically
Combination is as shown in table 1.Uneven damp degree n is defined as the extent of deviation of local water content and equivalent water content, and n values are bigger,
Then make moist more not uneven, such as following formula
(1)
The 1 equivalent water content of element stack oil-paper test product of table
The test product that makes moist uneven to above three classes carries out dielectric spectroscopy test at 40 DEG C（Test voltage 200V）, test result
Respectively as shown in Fig. 6, Fig. 7 and Fig. 8.
In step S11, using the dielectric spectroscopy of the Homogeneous Aqueous amount in step S0 come alternative steps S1 it is uneven by
The dielectric spectroscopy of uniform part in damp test product.Due to double thickness, capacitance needs double during calculating, according to complex media
Equivalent polarization, loss parameter calculate, using double-deck series model come between result of the test contrast.Homogeneous Aqueous amount
The dielectric response of dielectric spectroscopy is tested gained impedance Z and can be represented by R, C parallel equivalent circuit, such as following formula
(2)
According to Fig. 9 equivalent-circuit models, the RC equivalent circuit parameters substitution formula (3) of the different water content of individual layer can be obtained double-deck
Cause interfacial polarization that tan δ-f curves are lost by uneven during the combination of paper oil insulation.
(3)
(4)
(5)
Tan δ-f the curves for calculating gained are contrasted with the uneven dielectric spectroscopy curve to make moist measured by oilpaper sample,
During curve co-insides degree highest, you can correspond to form by looking into the water content for being similar to table 1 and damp degree and draw the paper oil insulation
The uneven damp degree of sample.
Finally, in step S2, you can made moist according to the dielectric spectral curve that actual oil-impregnated paper insulation component obtains with uneven
The similarity degree of the dielectric spectral curve of sample judges the damp degree of actual oil-impregnated paper insulation component.
In conclusion the embodiment of the present invention passes through a kind of side for the uneven damp degree for assessing oil-impregnated paper insulation component
Method, on the one hand, improve paper oil insulation and make moist assessment accuracy, and can draw more detailed situation of making moist；On the one hand, with doing
Dry weight method is compared, and the present invention can significantly improve the precision of test, and can obtain specific moisture distributing state；It is another
Aspect, compared with karr-Fei Xiufa, the present invention can realize non-destructive testing, to sample or oil paper insulation electrical equipment without destruction
And test process convenient quickly.
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
Enclose, therefore equivalent variations made according to the claims of the present invention, it is still within the scope of the present invention.
Claims (7)
- A kind of 1. method for the uneven damp degree for assessing oil-impregnated paper insulation component, it is characterised in that including：Step S1, multiple oil-impregnated paper insulation samples uniformly to make moist are combined by different way, form multiple uneven oil that make moist Impregnated paper sample, and dielectric spectroscopy test is carried out to each non-uniform oil-paper sample that makes moist, obtain multiple first dielectric spectras Curve, and it is corresponding with the damp degree for the non-uniform oil-paper sample that each makes moist to establish each first dielectric spectral curve Relation；Step S2, carries out dielectric spectroscopy test to actual oil-impregnated paper insulation component, obtains the second dielectric spectral curve, when described the When the similarity of one of two dielectric spectral curves and the first dielectric spectral curve reaches pre-provisioning request, by corresponding first dielectric spectra Damp degree of the corresponding damp degree of curve as the actual oil immersion insulation assembly.
- 2. according to the method described in claim 1, it is characterized in that, further included before the step S1：Step S0, make the different multiple oil-impregnated paper insulation samples uniformly to make moist of damp degree, and uniformly makes moist to each Oil-impregnated paper insulation sample carries out dielectric spectroscopy test, obtains multiple 3rd dielectric spectral curves.
- 3. according to the method described in claim 2, it is characterized in that, further included after the step S1：The equivalent impedance of the dielectric spectral curve for the oil-impregnated paper insulation sample that each obtained in each stack combinations is uniformly made moist Value；Each stack combinations is calculated according to acquisition each equivalent impedance value of oil-impregnated paper insulation sample for uniformly making moist Dielectric loss curve；And the accuracy of the first dielectric spectral curve obtained in the dielectric curve verification step S1 for passing through the calculating.
- 4. according to the method described in claim 1, it is characterized in that, the different oil-impregnated paper insulation samples uniformly to make moist makes moist Degree is different.
- 5. according to the method described in claim 1, it is characterized in that, the oil-impregnated paper insulation component be used for oil-immersed transformer, In the equipment such as oilpaper casing and oil immersed type capacitor.
- 6. according to the method any one of claim 1-5, it is characterised in that into line frequency in the step S1 and step S2 Domain dielectric spectra test is that input voltage carries out in the case of being 200V at 40 degree.
- 7. according to the method any one of claim 1-5, it is characterised in that：The thickness of the uneven oil-paper sample that makes moist after multiple oil-impregnated paper insulation sample combinations uniformly made moist with it is single uniformly The thickness of the oil-paper sample to make moist is identical.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108982603A (en) * | 2018-08-24 | 2018-12-11 | 西南交通大学 | A kind of test method of oil-immersed sleeve pipe dampness state |
| CN112505112A (en) * | 2020-12-08 | 2021-03-16 | 海南电网有限责任公司电力科学研究院 | FDS-based transformer local damping feature extraction method |
| CN112834872A (en) * | 2020-12-22 | 2021-05-25 | 深圳供电局有限公司 | Transformer bushing tap local damping assessment method and device and computer equipment |
| CN113447537A (en) * | 2021-06-25 | 2021-09-28 | 海南电网有限责任公司电力科学研究院 | Oiled paper insulation frequency domain dielectric spectrum measuring method and device, storage medium and terminal |
| CN113484369A (en) * | 2021-06-25 | 2021-10-08 | 海南电网有限责任公司电力科学研究院 | Oil paper insulation dielectric spectrum characteristic analysis method |
| CN113588733A (en) * | 2021-07-09 | 2021-11-02 | 深圳供电局有限公司 | Method and equipment for evaluating moisture content of oiled paper insulation |
| RU2788308C1 (en) * | 2022-06-27 | 2023-01-17 | Общество с ограниченной ответственностью "Инжиниринговый Центр Элхром" (ООО "Инжиниринговый Центр Элхром") | Method and device for continuous control of humidity of paper-oil insulation of high-voltage oil-filled equipment |
| CN117169788A (en) * | 2023-11-03 | 2023-12-05 | 江苏嘉盟电力设备有限公司 | Method for analyzing moisture state of middle joint of crosslinked polyethylene insulated power cable |
| CN117407631A (en) * | 2023-12-15 | 2024-01-16 | 南京中鑫智电科技有限公司 | Method and system for evaluating high-voltage sleeve damp state |
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| CN108982603A (en) * | 2018-08-24 | 2018-12-11 | 西南交通大学 | A kind of test method of oil-immersed sleeve pipe dampness state |
| CN112505112A (en) * | 2020-12-08 | 2021-03-16 | 海南电网有限责任公司电力科学研究院 | FDS-based transformer local damping feature extraction method |
| CN112834872A (en) * | 2020-12-22 | 2021-05-25 | 深圳供电局有限公司 | Transformer bushing tap local damping assessment method and device and computer equipment |
| CN113447537A (en) * | 2021-06-25 | 2021-09-28 | 海南电网有限责任公司电力科学研究院 | Oiled paper insulation frequency domain dielectric spectrum measuring method and device, storage medium and terminal |
| CN113484369A (en) * | 2021-06-25 | 2021-10-08 | 海南电网有限责任公司电力科学研究院 | Oil paper insulation dielectric spectrum characteristic analysis method |
| CN113588733A (en) * | 2021-07-09 | 2021-11-02 | 深圳供电局有限公司 | Method and equipment for evaluating moisture content of oiled paper insulation |
| RU2788308C1 (en) * | 2022-06-27 | 2023-01-17 | Общество с ограниченной ответственностью "Инжиниринговый Центр Элхром" (ООО "Инжиниринговый Центр Элхром") | Method and device for continuous control of humidity of paper-oil insulation of high-voltage oil-filled equipment |
| CN117169788A (en) * | 2023-11-03 | 2023-12-05 | 江苏嘉盟电力设备有限公司 | Method for analyzing moisture state of middle joint of crosslinked polyethylene insulated power cable |
| CN117169788B (en) * | 2023-11-03 | 2024-01-30 | 江苏嘉盟电力设备有限公司 | Method for analyzing moisture state of middle joint of crosslinked polyethylene insulated power cable |
| CN117407631A (en) * | 2023-12-15 | 2024-01-16 | 南京中鑫智电科技有限公司 | Method and system for evaluating high-voltage sleeve damp state |
| CN117407631B (en) * | 2023-12-15 | 2024-02-27 | 南京中鑫智电科技有限公司 | Method and system for evaluating high-voltage sleeve damp state |
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