CN105866647A - XLPE insulation aging state evaluation method based on different frequency dielectric loss ratios - Google Patents
XLPE insulation aging state evaluation method based on different frequency dielectric loss ratios Download PDFInfo
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- CN105866647A CN105866647A CN201610404171.XA CN201610404171A CN105866647A CN 105866647 A CN105866647 A CN 105866647A CN 201610404171 A CN201610404171 A CN 201610404171A CN 105866647 A CN105866647 A CN 105866647A
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- 238000009413 insulation Methods 0.000 title claims abstract description 63
- 239000004703 cross-linked polyethylene Substances 0.000 title claims abstract description 38
- 229920003020 cross-linked polyethylene Polymers 0.000 title claims abstract description 38
- 230000032683 aging Effects 0.000 title claims abstract description 19
- 238000011156 evaluation Methods 0.000 title abstract description 4
- 238000005259 measurement Methods 0.000 claims abstract description 27
- 238000012360 testing method Methods 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000005507 spraying Methods 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 238000004544 sputter deposition Methods 0.000 claims description 3
- 101100008047 Caenorhabditis elegans cut-3 gene Proteins 0.000 claims description 2
- 238000012935 Averaging Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000012797 qualification Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000010616 electrical installation Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000001566 impedance spectroscopy Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
Classifications
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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
- G01R31/1272—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 of cable, line or wire insulation, e.g. using partial discharge measurements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Testing Relating To Insulation (AREA)
Abstract
An XLPE insulation aging state evaluation method based on different frequency dielectric loss ratios comprises the following steps: preparing slice samples of the inner layer, the middle layer and the outer layer of the cable insulation; measuring the dielectric loss of the sample under the voltage of 50Hz and 0.1H under the same condition; obtaining the dielectric loss ratio of each sample under 0.1Hz and 50Hz, and calculating the dielectric loss ratio of each insulating layer and the whole insulating layer on the basis; evaluating the aging state of XLPE insulation of the alternating current or direct current cable according to the dielectric loss ratio of each layer and the change rule and the dielectric loss ratio of the whole insulation; according to the method, the influence of uneven aging at different positions can be eliminated, the integral state of insulation can be reflected, and the aging degree of XLPE insulation of the AC and DC cables can be accurately evaluated; the sample amount required by the test is small, and the requirements on the voltage and the capacity of a test instrument are low; the ratio of dielectric loss measurement values under different frequencies is used as a characteristic parameter, so that the system error of a test instrument and the influence of the external environment are reduced; and the comparison with historical data is not needed, and the engineering application is convenient.
Description
Technical field
The present invention relates to a kind of method that XLPE insulation ag(e)ing state is estimated, specifically relate to
And measurement of based on polymer solids medium dielectric loss angle tangent at different frequencies and ratio
Relatively, the method ageing state of XLPE insulation being estimated.
Background technology
Dielectric loss angle tangent (tan δ, hereinafter referred " dielectric loss ") be describe dielectric material and
The important performance characteristic of insulation of electrical installation state.Dielectric loss can reflect the globality defect of insulation
(as the most aging) and serious locality defect (Ru Shuishu)；By tanδ variation with voltage
Curve may determine that whether insulation makes moist, containing bubble and degree of aging etc.；It and breakdown voltage
Between there is also dull corresponding relation, dielectric loss increases, and breakdown voltage declines；These all show to be situated between
Damage can be as the actual parameter of insulation diagnosis.
Dielectric loss is an amount varied with frequency, and this change is to polarize present in medium
Caused.But, the frequency spectrum measuring dielectric loss needs special equipment, and by complete for whole frequency spectrum
Integral representation is the most inconvenient for engineering evaluation, the most directly perceived.For the ease of engineer applied, I
Generally provide dielectric loss value under a certain characteristic frequency, two the most commonly used features frequencies
Rate is 50Hz and 0.1Hz.
Initial dielectric loss measurement is all carried out under power frequency (i.e. 50Hz), such as, and GB/T
3048.11-2007 " electric wire electrical performance test method the 11st part: dielectric loss angle is just
Cut test " in specified in more detail measured to the dielectric loss value of cable product in industrial-frequency alternating current pressure
The continuous request such as prepared by testing equipment, sample, test procedure, result sign.
Along with the development of detection technique, intrasonic (i.e. 0.1Hz) test method is in generation nineteen ninety
Being suggested, and be applied in the middle of the state-detection of solid polymer insulation, it can be substantially reduced
Requirement to place capacity, reduces equipment volume, is conducive to carrying out on-the-spot test.IEEE divides
The relevant criterion of intrasonic test has not been formulated, 2004 and in 2000 in 2013
IEEE.Std.400-2001, IEEE.Std.400.2-2004, IEEE.Std.400.2-2013, and
Wherein describe the off-line test method for finished product ac cable, and cable insulation is different old
The basis for estimation of change degree.But substantial amounts of research finds, criterion listed by standard is the most inapplicable
In engineering practice, such as, standard specifies: when the dielectric loss recorded is more than 4 × 10-3Time, show electricity
Cable serious aging, it is necessary to change immediately.And it practice, a large amount of preferable cable of state its be situated between
Loss measurement value is also both greater than 4 × 10-3。
Insulation dielectric loss value, tested person system accuracy and external environment fluctuation is measured under single-frequency
Impact relatively big, sometimes can not truly reflect the virtual condition of insulation system.Can choose
The ratio of the dielectric loss measurement value under two characteristic frequencyes of 50Hz and 0.1Hz judges that XLPE insulate
Ageing state, and its concrete assessment technology, there is no correlational study at present.
Summary of the invention
XLPE is insulated currently with dielectric loss measurement under 50Hz or 0.1Hz frequency to make up
Carrying out state estimation tested person system and external environment impact is serious, test data dispersibility is big,
The problem that can not truly reflect system mode, it is an object of the invention to provide a kind of based on difference
The XLPE insulation ag(e)ing state evaluating method of frequency dielectric loss ratio, the inventive method is based on two
Under individual characteristic frequency, XLPE insulation ag(e)ing state is had by the relative ratio of dielectric loss measurement value
The method of effect assessment.
For achieving the above object, the present invention is by the following technical solutions:
A kind of XLPE insulation ag(e)ing state evaluating method based on different frequency dielectric loss ratio, bag
Include following steps:
Step 1: prepare sliced piece specimen, intercept the electricity of certain length from XLPE finished cable
Cable sample section, after taking out conductor thread core and divesting all parts beyond insulation shielding, circumferentially side
To carrying out hoop cutting, it is thus achieved that certain thickness film type XLPE insulate test piece, exists respectively
All cut 3 to 5 plate sheet samples corresponding to insulation inner, middle and outer layer position, clean, flatten,
And it is standby after doing appropriate pretreatment；
Sample dielectric loss measurement under step 2:50Hz voltage, in the environmental condition determined and test
Under the conditions of, measure each sample dielectric loss value under 50Hz power-frequency voltage one by one, be designated as tan δ (50)；
Sample dielectric loss measurement under step 3:0.1Hz voltage, at the environment identical with step 2
Under condition and experimental condition, only electric voltage frequency is adjusted to 0.1Hz, measures each sample one by one and exist
Dielectric loss value under 0.1Hz Ultra-low Frenquency Voltage, is designated as tan δ (0.1)；
Step 4: data process, to each tested sample, asks for itself 0.1Hz and 50Hz electricity
The ratio of pressure dielectric loss, is designated as λ, λ=tan δ (0.1)/tan δ (50)；The λ measured value of each layer is asked
Averagely, as the final result of this layer, it is designated as λIn、λIn、λOutward；Again inner, middle and outer layer is surveyed
Value averaged, as the final result of insulation global feature parameter, is designated as λWhole；
Step 5: insulation ag(e)ing state estimation, according to gained feature parameter"λ"WholeSize, it is judged that
The ageing state of surveyed XLPE cable insulation, λWholeThe biggest, the degree of aging of insulation is the most serious.
Pretreated sample two sides ion sputtering instrument carries out metal spraying process to reduce measurement
Error.
According to proposed by the invention based on the comparing of dielectric loss measurement value under two characteristic frequencyes
The method that XLPE insulation ag(e)ing state is effectively assessed by value, can be to AC and DC electricity
The ageing state of cable XLPE insulation carries out accurate evaluation, effectively judges the real-time of XLPE cable
State, safe operation defeated for AC and DC, distribution line provides safeguard.The present invention is with insulation
Section is test sample, and required sample size is little, and voltage and capacity requirement to test instrunment are low；
The present invention, using the meansigma methods of inner, middle and outer layer sample measurement value as final measurement result, disappears
Except the aging uneven impact of diverse location, be conducive to the overall performance of reflection insulation；This
The bright characteristic parameter insulated as XLPE using the ratio of dielectric loss measurement value under different frequency, reduces
Test instrument system error and the impact of external environment；The present invention is with 50Hz under the same terms
And the ratio of 0.1Hz dielectric loss measurement value is as the basis for estimation of state of insulation, it is not necessary to cable
Historical data is analyzed, and engineer applied is convenient.
Accompanying drawing explanation
Fig. 1 is the ring cutting sampling schematic diagram of XLPE cable insulation.
Fig. 2 is the sample object figure in the embodiment of the present invention after XLPE cable insulation ring cutting.
Fig. 3 is the sample pictorial diagram after spraying gold electrode in the embodiment of the present invention.
Fig. 4 is the dielectric and magnetic test electrode pictorial diagram in the embodiment of the present invention.
Fig. 5 is the dielectric and magnetic test electrode structure schematic diagram in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention will be described in more detail.
Proposed by the invention based on the relative ratio pair of dielectric loss measurement value under two characteristic frequencyes
The method that XLPE insulation ag(e)ing state is effectively assessed, comprises the steps:
Step 1: prepare sliced piece specimen；
Run that within 16 years, to exchange XLPE cable with the 110kV of 24 years be right with new, on-the-spot
As, take the cut cable being about 100mm respectively, remove conductor thread core and divest insulation shielding with
Outer all parts, carry out hoop cutting (such as peel a fruit skin) along cable circumferencial direction, will absolutely
The sliced piece specimen of edge layer ring cutting Cheng Houyue (0.2 ± 0.02) mm, is radially divided into insulation
Three parts, are called internal layer, middle level and outer layer, as it is shown in figure 1, to every kind of cable, point
Do not cutting 3 samples corresponding to insulation inner, middle and outer layer position, be cut into the length of side and be about 100mm
Rectangle, use after alcohol wipe, all samples be positioned in 50 DEG C of constant temperature ovens, take out
Vacuum drying 6h, takes out sample in baking oven afterwards and flattens standby；Insulation slice thickness
Should be not too small, otherwise there will be significantly curling and out-of-flatness.Fig. 2 is in the embodiment of the present invention
Sample object figure after XLPE cable insulation ring cutting.
In order to reduce measurement error, improve contacting between sample and measuring instrument institute belt electrode,
Sample two sides ion sputtering instrument can be carried out metal spraying process, add the sample after gold electrode such as
Shown in Fig. 3.
Sample dielectric loss measurement under step 2:50Hz voltage；
Sample dielectric loss measurement under step 3:0.1Hz voltage；
As preferred embodiment, select Germany's Novocontrol Concept 80 broadband dielectric spectroscopy instrument,
Can once complete same tested sample dielectric loss measurement under 50Hz and 0.1Hz voltage；Wideband
The test electrode material object of dielectric spectrometer and structural representation thereof, the most as shown in Figure 4 and Figure 5, will
The most when attached, arrange test temperature is 25 DEG C to sample, and test frequency range is 0.05Hz～1kHz,
Start test under vacuum, after having tested, record sample under 0.1Hz and 50Hz frequency
Dielectric loss value；One sample of one-shot measurement, changes sample afterwards, until all samples are all surveyed
Amount completes；
Step 4: data process；
To each tested sample, ask for the ratio λ of dielectric loss under itself 0.1Hz and 50Hz voltage, as
Shown in table 1, every kind of cable have chosen 3 samples at each layer；Afterwards, 3 to each layer
Individual measured value is averaged, it is thus achieved that the λ of every kind of cable XLPE insulationIn、λIn、λOutward；Finally,
Inner, middle and outer layer measurement result is averaged again, it is thus achieved that the characteristic parameter that insulation is overall,
I.e. λWhole, as shown in table 1.
Table 1
Step 5: insulation ag(e)ing state estimation；
It can be seen that the dielectric loss measurement value of individual sample exists bigger dispersion from table 1 data
Property, it is difficult to be used for insulating assessment, and use and take, at same position, the side that three samples are averaged
Formula can reduce this dispersibility；Meanwhile, inner, middle and outer layer is averaged by employing again
Mode is conducive to the integrality of reflection insulation.Along with XLPE cable runs the increase of the time limit,
Dielectric loss ratio λWholeIt is monotone increasing, from the 1.76 of new cable, to running the 3.37 of 16 years cables,
Arrive again and run the 5.39 of 24 years cables, show λWholeCan be with the entirety of Efficient Characterization XLPE insulation
Ageing state.Analyze and also find, the insulation shape that the dielectric loss of new cable is caused by processing extrusion
State differentia influence, the dielectric loss ratio of each layer does not has evident regularity；And for running 16 years and 24
Year cable, from internal layer to outer layer, dielectric loss ratio presents the trend being gradually reduced, this with exchange
The practical situation that electric field in cable insulation and heterogeneity phantom the most gradually weaken matches.
In order to verify that the method carries out the effect of Aging Assessment to direct current cables XLPE insulation,
The dielectric loss listing the direct current cables XLPE insulation after testing new and pre-qualification in table 2 is surveyed
Amount result.It can be seen that first, after testing through pre-qualification, the entirety of XLPE insulation
Dielectric loss ratio λWholeThere is obvious increase, increased to 2.51 by 1.06；Secondly, new cable
Inner, middle and outer layer dielectric loss ratio does not has evident regularity, and after pre-qualification is tested, Jie of sample
Damaging ratio and present the trend being gradually increased from internal layer to outer layer, this transports through scene with ac cable
The result that after row, the dielectric loss ratio of XLPE insulation is gradually reduced from inside to outside is completely contrary, display
Direct current cables insulation diverse field strength distribution characteristic under high pressure, high load capacity.
Table 2
The dielectric loss ratio more than measured under two characteristic frequencyes (0.1Hz and 50Hz) of acquisition exists
The distribution of inner, middle and outer layer and AC and DC cable reality are with voltage, on-load state is to insulation
Thermal-electrical aging effect completely the same, and assess parameter lambdaWholeSize and XLPE insulate in reality
Run or after long term test, occur aging degree to present dull corresponding relation, thus can test
Card, proposed by the invention based on the relative ratio pair of dielectric loss measurement value under two characteristic frequencyes
The method that XLPE insulation ag(e)ing state is estimated is simple, accurately and reliably.
Claims (2)
1. an XLPE insulation ag(e)ing state evaluating method based on different frequency dielectric loss ratio, its feature exists
In: comprise the steps:
Step 1: prepare sliced piece specimen, intercept the cable sample section of certain length from XLPE finished cable, take
After going out conductor thread core and divesting all parts beyond insulation shielding, along the circumferential direction carry out hoop cutting, obtain
Obtain certain thickness film type XLPE insulation test piece, respectively corresponding to insulation inner, middle and outer layer position
All cut 3 to 5 plate sheet samples, clean, flatten, and standby after doing pretreatment；
Sample dielectric loss measurement under step 2:50Hz voltage, under the environmental condition determined and experimental condition,
Measure each sample dielectric loss value under 50Hz power-frequency voltage one by one, be designated as tan δ (50)；
Sample dielectric loss measurement under step 3:0.1Hz voltage, in the environmental condition identical with step 2 and test
Under the conditions of, only electric voltage frequency is adjusted to 0.1Hz, measures each sample one by one under 0.1Hz Ultra-low Frenquency Voltage
Dielectric loss value, is designated as tan δ (0.1)；
Step 4: data process, and to each tested sample, ask for dielectric loss under itself 0.1Hz and 50Hz voltage
Ratio, is designated as λ, λ=tan δ (0.1)/tan δ (50)；The λ measured value of each layer is averaging, final as this layer
As a result, it is designated as λIn、λIn、λOutward；Again to inner, middle and outer layer measured value averaged, as insulation entirety
The final result of characteristic parameter, is designated as λWhole；
Step 5: insulation ag(e)ing state estimation, according to gained feature parameter"λ"WholeSize, it is judged that surveyed XLPE
The ageing state of cable insulation, λWholeThe biggest, the degree of aging of insulation is the most serious.
XLPE insulation ag(e)ing state based on different frequency dielectric loss ratio the most according to claim 1 is commented
Estimate method, it is characterised in that: pretreated sample two sides ion sputtering instrument is carried out metal spraying and processes to subtract
Little measurement error.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110133456A (en) * | 2019-05-21 | 2019-08-16 | 深圳供电局有限公司 | Method for constructing criterion system for cable insulation ultralow frequency dielectric loss detection |
| CN110298012A (en) * | 2019-06-24 | 2019-10-01 | 西安交通大学 | Mesolow XLPE cable lifetime estimation method based on test data Yu O&M information |
| CN110618364A (en) * | 2019-11-03 | 2019-12-27 | 西南交通大学 | Method for evaluating insulation reliability of XLPE cable terminal of power distribution network |
| CN111337797A (en) * | 2020-01-21 | 2020-06-26 | 广西大学 | XLPE power cable main insulation non-uniform thermal aging state evaluation method based on modified Debye model |
| CN111398722A (en) * | 2020-04-14 | 2020-07-10 | 西安交通大学 | Equipment for on-site measurement of transmission characteristics of power cable |
| CN111965497A (en) * | 2020-06-22 | 2020-11-20 | 内蒙古大唐国际托克托发电有限责任公司 | High-voltage cable early defect joint diagnosis method |
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| CN110133456B (en) * | 2019-05-21 | 2021-03-19 | 深圳供电局有限公司 | Method for constructing criterion system for cable insulation ultralow frequency dielectric loss detection |
| CN110133456A (en) * | 2019-05-21 | 2019-08-16 | 深圳供电局有限公司 | Method for constructing criterion system for cable insulation ultralow frequency dielectric loss detection |
| CN110298012A (en) * | 2019-06-24 | 2019-10-01 | 西安交通大学 | Mesolow XLPE cable lifetime estimation method based on test data Yu O&M information |
| CN110298012B (en) * | 2019-06-24 | 2020-09-01 | 西安交通大学 | Test data and operation and maintenance information-based medium and low voltage XLPE cable service life assessment method |
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