CN107861030A - A kind of stage confirmation method for assessing paper oil insulation development of defects degree - Google Patents
A kind of stage confirmation method for assessing paper oil insulation development of defects degree Download PDFInfo
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- CN107861030A CN107861030A CN201710887655.9A CN201710887655A CN107861030A CN 107861030 A CN107861030 A CN 107861030A CN 201710887655 A CN201710887655 A CN 201710887655A CN 107861030 A CN107861030 A CN 107861030A
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- shelf depreciation
- paper oil
- oil insulation
- probability density
- stage
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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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Housings And Mounting Of Transformers (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a kind of stage confirmation method for assessing paper oil insulation development of defects degree, including step 1：Carry out partial discharge of transformer experiment, the waveform of partial discharge pulse in paper oil insulation equipment to be measured is measured using prior art, the waveform of the paper oil insulation shelf depreciation obtained to sampling is handled, and extracts the total time of the single waveform of shelf depreciation, maximum amplitude, maximum amplitude time.Step 2：It is grouped according to the data of extraction, forms maximum amplitude probability density distribution figure, single waveform total time probability density distribution figure and maximum amplitude proportion probability density distribution figure.Step 3：Three kinds of probability density distribution figures are extracted with average value, variance, the degree of bias, kurtosis is as characteristic quantity, to data progress development of defects divided stages.
Description
Technical field
The present invention relates to a kind of stage confirmation method for assessing paper oil insulation development of defects degree.
Background technology
The running situation of transformer and fault statistics show that built-in electrical insulation is the thin of transformer in AC transmission system over the years
Weak link, in operation apparatus insulated defect presence and insulation electric field, thermal field, mechanical force and chemical stress etc. it is a variety of because
Aging deterioration under plain comprehensive function is the main reason for causing transformer equipment failure, however, converter power transformer does not only exist
The Insulation Problems of common AC power transformer, and its valve side winding bears alternating voltage, DC voltage, alternating current-direct current for a long time
The effect of composite voltage, harmonic wave and polarity inversion voltage, because Electric Field Distribution is different under different voltage types, therefore the change of current becomes
Electric Field Distribution is more complicated compared with AC power transformer in depressor, and its Insulation Problems is also more complicated.
Paper oil insulation is the built-in electrical insulation principal mode of converter power transformer, and shelf depreciation is not only to cause paper oil insulation old
The main reason for changing deterioration, or the important sign and the form of expression of insulation ag(e)ing deterioration, shelf depreciation lasting for a long time will make
Insulation is gradually suffered erosion and damaged, and frequently can lead to great interior insulation accident, and mechanical force or thermal field and electric field is mutual
Effect finally can also develop into discharge in insulation failure and ultimately result in apparatus insulated failure.In order to improve the reliable of converter power transformer
Property, there is engineering significance to transformer oil Aging of Oil-paper Insulation in Oil divided stages.
The content of the invention
The present invention is in order to solve the above problems, it is proposed that a kind of stage confirmation side for assessing paper oil insulation development of defects degree
Method, the present invention can control driving contactor never adhesion, or even if sticking together, then ensure not malfunction, just
Driving potential safety hazard caused by contactor adhesion problems can be eliminated.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of stage confirmation method for assessing paper oil insulation development of defects degree, comprises the following steps：
Step 1：Partial discharge of transformer experiment is carried out, is measured in paper oil insulation equipment to be measured using prior art and locally put
The waveform of electric pulse, the waveform of the paper oil insulation shelf depreciation obtained to sampling are handled, and extract the single waveform of shelf depreciation
Total time, maximum amplitude, the maximum amplitude time.
Step 2：It is grouped according to the data of extraction, maximum amplitude probability density distribution figure is formed, when single waveform is total
Between probability density distribution figure and maximum amplitude proportion probability density distribution figure.
Step 3：Average value is extracted to three kinds of probability density distribution figures, variance, the degree of bias, kurtosis is as characteristic quantity, to data
Carry out development of defects divided stages.
Described three phases are shelf depreciation incipient stage, shelf depreciation developing stage and shelf depreciation prebreakdown rank
Section.The shelf depreciation incipient stage is embodied in：There is a small amount of shelf depreciation, amplitude is small, and waveform total time is short, peak-peak
Proportion is big, and three kinds of probability density distributions are concentrated, and paper oil insulation damage is small.Shelf depreciation developing stage is embodied in：Go out
, there is the shelf depreciation of a small amount of amplitude, the total time of single waveform is elongated, peak-peak institute in the shelf depreciation of existing more number
Accounting example is small, and three kinds of probability density distributions are more concentrated, and paper oil insulation damage is medium.Shelf depreciation prebreakdown stage specific manifestation
For：There is intensive shelf depreciation, and substantial amounts of amplitude shelf depreciation occurs, shared by single waveform total time and peak-peak
Ratio polarises seriously, and three kinds of probability density distributions disperse.
Methods described is applied to the compound converter power transformer of alternating current-direct current.
Maximum amplitude time and single waveform total time of the maximum amplitude proportion for single waveform in methods described
Ratio.
X-axis is time hop count in probability density distribution figure in methods described, the amplitude corresponding to the y-axis amount of being characterized, in z
For the probability of the generation corresponding to respective magnitudes.
Period in the probability density distribution figure refers to choosing 30min~60min period, each to ensure
Data volume in period is enough.
The prior art refers to standard GB/T/T7354-2003/IEC60270：The shelf depreciation inspection of 2000 defineds
Survey technology.
Compared with prior art, beneficial effects of the present invention are：The present invention realizes to be believed using shelf depreciation individual pulse
Number characteristic parameter divide the purpose of inside transformer insulation defect development degree.
Brief description of the drawings
The Figure of description for forming the part of the application is used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its illustrate be used for explain the application, do not form the improper restriction to the application.
Fig. 1：Measurement procedure；
Fig. 2：The oscillogram of measuring system；
When the maximum amplitude distribution map of Fig. 3 (a)-Fig. 3 (c) paper oil insulations, the distribution of single waveform total time and maximum amplitude
Between proportion be distributed three kinds of probability density distribution figures；
Embodiment：
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
It is noted that described further below is all exemplary, it is intended to provides further instruction to the application.It is unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
In the present invention, term as " on ", " under ", "left", "right", "front", "rear", " vertical ", " level ", " side ",
The orientation or position relationship of instructions such as " bottoms " are based on orientation shown in the drawings or position relationship, only to facilitate describing this hair
Bright each part or component structure relation and the relative determined, not refer in particular to either component or element in the present invention, it is impossible to understand
For limitation of the present invention.
In the present invention, term such as " affixed ", " connected ", " connection " should be interpreted broadly, and expression can be fixedly connected,
Can also be integrally connected or be detachably connected；Can be joined directly together, can also be indirectly connected by intermediary.For
The related scientific research of this area or technical staff, the concrete meaning of above-mentioned term in the present invention can be determined as the case may be,
It is not considered as limiting the invention.
As background technology is introduced, shelf depreciation in the prior art be present and be not only to cause paper oil insulation aging deterioration
The main reason for, or insulation ag(e)ing deterioration important sign and the form of expression, shelf depreciation lasting for a long time will make insulation by
Gradually suffer erosion and damage, frequently can lead to great interior insulation accident, and the interaction of mechanical force or thermal field and electric field is most
It also can develop into discharge in insulation failure eventually and ultimately result in the deficiency of apparatus insulated failure, in order to solve technical problem as above,
Present applicant proposes a kind of stage confirmation method for assessing paper oil insulation development of defects degree.
In a kind of typical embodiment of the application, as shown in figure 1, transformer oil paper insulation shelf depreciation development of defects
The diagnostic method of degree includes：
Step 1：Partial discharge of transformer experiment is carried out, is measured in paper oil insulation equipment to be measured using prior art and locally put
The waveform of electric pulse, the waveform of the paper oil insulation shelf depreciation obtained to sampling are handled, and extract the single waveform of shelf depreciation
Total time, maximum amplitude, the maximum amplitude time.
Step 2：It is grouped according to the data of extraction, maximum amplitude probability density distribution figure is formed, when single waveform is total
Between probability density distribution figure and maximum amplitude proportion probability density distribution figure.
Step 3：Average value is extracted to three kinds of probability density distribution figures, variance, the degree of bias, kurtosis is as characteristic quantity, to data
Carry out development of defects divided stages.
By table 1, the numerical value of characteristic quantity has the more obvious rule of development in different phase, utilizes clustering algorithm
The numerical value of characteristic quantity in multiple stages is classified, data as shown in table 2 can be obtained.By the whole development of defects stage
It is divided into three processes, respectively shelf depreciation incipient stage, shelf depreciation developing stage and shelf depreciation prebreakdown stage.
The present invention divides the order of severity of transformer development of defects by the analysis to individual pulse geometric properties, realizes
The target of the order of severity of transformer development of defects is divided using the geometric properties of local discharge signal.
The characteristic numerical quantity of table 1 at different moments
(a) the 2nd group
(b) the 13rd group
(c) the 25th group
The classification results of table 2
The preferred embodiment of the application is the foregoing is only, is not limited to the application, for the skill of this area
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent substitution, improvement etc., should be included within the protection domain of the application.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, model not is protected to the present invention
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deformation that creative work can make still within protection scope of the present invention.
Claims (7)
1. a kind of stage confirmation method for assessing paper oil insulation development of defects degree, it is characterized in that：Comprise the following steps：
Step 1：Partial discharge of transformer experiment is carried out, shelf depreciation arteries and veins in paper oil insulation equipment to be measured is measured using prior art
The waveform of punching, the waveform of the paper oil insulation shelf depreciation obtained to sampling are handled, and extract the total of the single waveform of shelf depreciation
Time, maximum amplitude, maximum amplitude time.
Step 2：It is grouped according to the data of extraction, forms maximum amplitude probability density distribution figure, single waveform total time is general
Rate density profile and maximum amplitude proportion probability density distribution figure.
Step 3：Three kinds of probability density distribution figures are extracted with average value, variance, the degree of bias, kurtosis is as characteristic quantity, to data progress
Development of defects divided stages.
2. a kind of stage confirmation method for assessing paper oil insulation development of defects degree as claimed in claim 1, it is characterized in that：Institute
The three phases stated are shelf depreciation incipient stage, shelf depreciation developing stage and shelf depreciation prebreakdown stage.Shelf depreciation
Incipient stage is embodied in：There is a small amount of shelf depreciation, amplitude is small, and waveform total time is short, and peak-peak proportion is big,
Three kinds of probability density distributions are concentrated, and paper oil insulation damage is small.Shelf depreciation developing stage is embodied in：There is more number
Shelf depreciation, there is the shelf depreciation of a small amount of amplitude, the total time of single waveform is elongated, and peak-peak proportion is small, and three
Kind probability density distribution is more concentrated, and paper oil insulation damage is medium.The shelf depreciation prebreakdown stage is embodied in：Occur intensive
Shelf depreciation, and substantial amounts of amplitude shelf depreciation occurs, and single waveform total time and peak-peak proportion polarise
Seriously, three kinds of probability density distributions disperse.
3. a kind of stage confirmation method for assessing paper oil insulation development of defects degree as claimed in claim 1, it is characterized in that：Institute
Method is stated suitable for the compound converter power transformer of alternating current-direct current.
4. a kind of stage confirmation method for assessing paper oil insulation development of defects degree as claimed in claim 1, it is characterized in that：Institute
It is the maximum amplitude time of single waveform and the ratio of single waveform total time to state maximum amplitude proportion in method.
5. a kind of stage confirmation method for assessing paper oil insulation development of defects degree as claimed in claim 1, it is characterized in that：Institute
It is time hop count to state x-axis in the probability density distribution figure in method, the amplitude corresponding to the y-axis amount of being characterized, and is respective magnitudes in z
The probability of corresponding generation.
6. a kind of stage confirmation method for assessing paper oil insulation development of defects degree as claimed in claim 1, it is characterized in that：Institute
State the period in probability density distribution figure refer to choose 30min~60min period, to ensure in each period
Data volume is enough.
7. a kind of stage confirmation method for assessing paper oil insulation development of defects degree as claimed in claim 1, it is characterized in that：Institute
State prior art and refer to standard GB/T/T7354-2003/IEC60270：The Partial Discharge Detecting Technology of 2000 defineds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710887655.9A CN107861030B (en) | 2017-09-27 | 2017-09-27 | Stage confirmation method for evaluating development degree of oiled paper insulation defect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710887655.9A CN107861030B (en) | 2017-09-27 | 2017-09-27 | Stage confirmation method for evaluating development degree of oiled paper insulation defect |
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| CN107861030A true CN107861030A (en) | 2018-03-30 |
| CN107861030B CN107861030B (en) | 2020-01-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114184904A (en) * | 2021-11-05 | 2022-03-15 | 西南交通大学 | Method for evaluating insulation damage degree of ethylene propylene rubber cable of motor train unit |
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| CN102193052A (en) * | 2010-03-08 | 2011-09-21 | 湖北省电力试验研究院 | Method for jointly evaluating insulation state of oil paper by using multiple statistical parameters |
| CN103091612A (en) * | 2013-01-16 | 2013-05-08 | 重庆市电力公司电力科学研究院 | Separation and recognition algorithm for transformer oiled paper insulation multiple partial discharging source signals |
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| WO2017091966A1 (en) * | 2015-12-01 | 2017-06-08 | General Electric Technology Gmbh | An intelligent assessment method of main insulation condition of transformer oil paper insulation |
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| CN103091612A (en) * | 2013-01-16 | 2013-05-08 | 重庆市电力公司电力科学研究院 | Separation and recognition algorithm for transformer oiled paper insulation multiple partial discharging source signals |
| WO2017091966A1 (en) * | 2015-12-01 | 2017-06-08 | General Electric Technology Gmbh | An intelligent assessment method of main insulation condition of transformer oil paper insulation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114184904A (en) * | 2021-11-05 | 2022-03-15 | 西南交通大学 | Method for evaluating insulation damage degree of ethylene propylene rubber cable of motor train unit |
| CN114184904B (en) * | 2021-11-05 | 2022-07-08 | 西南交通大学 | Method for evaluating insulation damage degree of ethylene propylene rubber cable of motor train unit |
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| CN107861030B (en) | 2020-01-17 |
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