CN105866015A - Method and system for evaluating ageing life of crosslinked polyethylene insulating cable for smart energy - Google Patents
Method and system for evaluating ageing life of crosslinked polyethylene insulating cable for smart energy Download PDFInfo
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- CN105866015A CN105866015A CN201610319113.7A CN201610319113A CN105866015A CN 105866015 A CN105866015 A CN 105866015A CN 201610319113 A CN201610319113 A CN 201610319113A CN 105866015 A CN105866015 A CN 105866015A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The invention discloses a method and a system for evaluating the ageing life of a crosslinked polyethylene insulating cable for smart energy. The method comprises the following steps: accelerating a thermal ageing life estimation test, and introducing an electrical ageing factor in the thermal ageing life estimation test. According to the method and the system, electricity is introduced on the basis of a single factor thermal ageing estimation test, that is, the thermal ageing test is accelerated on a cable test specimen, and meanwhile a rated working voltage is applied to an insulating layer of the cable test specimen, so that the simulated ageing test conditions are in better accordance with an ageing process in a practical operating process of cable insulation; therefore, the evaluated life value which is more close to the actual life of the cable can be obtained; the method and the system have more guidance meaning on the transformation and replacement of a cable project engineering.
Description
Technical field
The present invention relates to wisdom energy cross-linked polyethylene insulated cable aging life-span appraisal procedure and system.
Background technology
At present, cable service life of regulation is an assessed value in industry, if assessed value is little, can cause the mistake of cable
Early changing causes capital to waste, if assessed value is excessive, will be accidents caused because changing cable the most in time, and there is safety
Hidden danger.Therefore, the service life of accurate evaluation cable there is the biggest economic benefit and realistic meaning.
Traditional cable life appraisal procedure, is to set up Arrhenius model by accelerating thermal aging test, according to relatively
The aging life-span time at a temperature of the aging life-span of measuring and calculating is extrapolated to cable actual motion under high-temperature, but this acceleration is old
Change test and only considered the impact on cable insulation ageing process of " hot " factor, and cable insulation is in actual moving process
Can be affected, to crosslinked polyethylene in these factors by the factor such as heat, electricity, stress, chemical substance, moisture, light
Aging active be hot and electric, especially entering moisture within insulating materials under electric field action can be formed
" water tree " phenomenon, it is the key factor causing Electrical Tree Aging of XLPE Insulation to lose efficacy.So, only consider by accelerating
The aging life-span of thermal aging test extrapolation cross-linked polyethylene insulated cable is not accurate enough.
Summary of the invention
First purpose of the present invention is to provide a kind of more efficiently cable aging life-span evaluation test system.
The technical scheme realizing first purpose of the present invention is a kind of wisdom energy cross-linked polyethylene insulated cable aging longevity
Life assessment system, including AC power, line resistance, high temperature resistant electric power connection line and air aging baking oven；Described air
Sample holder is set in ageing oven；Described sample holder includes draw-in groove and the fixing sliding clamp that slides in draw-in groove.
Described air aging baking oven inwall surrounding arranges epoxy resin backplate.
Second object of the present invention is to provide a kind of more efficiently cable aging life-span evaluation test method.
The technical scheme realizing second purpose of the present invention is a kind of wisdom energy cross-linked polyethylene insulated cable aging longevity
Life appraisal procedure, it is characterised in that: use aforesaid wisdom energy cross-linked polyethylene insulated cable aging life-span to assess system
System, comprises the following steps:
Step one: sample of cable to be assessed is pre-processed；
Step 2: by sample of cable to be assessed, put into the air aging baking oven reaching design temperature, by electricity to be assessed
Cable sample conductor and insulating barrier connect AC power, carry out heat ageing；
Step 3: stop the insulating barrier to the sample of cable to be assessed after step 2 and sample, according to GB/T 2951.11-2008
Method of testing carries out mechanical robustness testing, record the elongation rate of tensile failure of arbitrary sample become before heat ageing ± 50%, aging
The cable aging life-span that time used is under Current Temperatures；
Step 4: utilize Arrhenius relationship to fit to curve ln t=E/RT+A, in formula, t the result of step 3
Being the aging reaction time, E is insulating materials activation energy, and R is mol gas constant, and T is aging temperature.Pass through to be surveyed
Ageing time fits to curve with the pass mooring points of temperature, is extrapolated to the service life under cable operating temperature.
Specifically, described step one pretreatment for peel off sample of cable one end to be assessed outer jacket, expose conductor and
Insulating barrier；In order to make assessment data the most accurate, if described sample of cable single-core cable to be assessed, Specimen Number is many
In 3；If three-core cable, Specimen Number is no less than 2, uses connecting line in parallel between multiple sample of cables to be assessed.
Further preferred scheme, in described step 2, described air aging baking oven is known air replacement rate and air stream
The ageing oven of speed.
In described step 2, described design temperature, for exceeding in the range of cable actual motion temperature 30～50 DEG C, at least selects
Select three temperature environments and be accelerated degradation.
As temperature set optimal scheme, in described step 2, described design temperature be respectively 110 DEG C, 125 DEG C,
135 DEG C, air exchange frequency 8～20 time/hour of ageing oven.
In described step 2, sample of cable to be assessed is placed on the slidably specimen holder of air aging baking oven and clips.
In described step 3, choosing insulating barrier from sample of cable two ends to be assessed, the sampling number of each sample insulation is many
In 2.
After have employed technique scheme, the present invention has following positive effect: (1) one aspect of the present invention considers
Affect the key factor " hot " of Electrical Tree Aging of XLPE Insulation, and to cable in original acceleration thermal lifetime is tested
Insulation applies operating voltage, simultaneously it is contemplated that affect the key factor " electric " of Electrical Tree Aging of XLPE Insulation, thus combines
Conjunction considers " hot ", the impact on cable aging life-span of " electric " dual factors, has formulated closer to cable actual motion environment
Experimental condition, reduce the assessment errors that single heat ageing causes actual life relative to cable so that the electricity of assessment
Cable more meets the actual useful year of cable service life, provides more for the transformation of power network line, the operation maintenance etc. of cable
Add definite reference frame, reduce unnecessary cost waste, reduce operation risk.
(2) the air aging baking oven that the present invention uses is the ageing oven of known air replacement rate and air velocity, it is possible to protect
Card heat ageing speed is not affected by the volatile matter of release, oxygen depletion etc. in ageing process, improves the accuracy of test.
(3) sample of cable is used slidably fixture to be fixed during accelerated aging test by the present invention, reaches
Can arbitrarily adjust sample of cable position in sample mount and to the fixing effect of the sample of cable of various outer diameter size.
(4) present invention uses epoxy resin board to be used for blocking air aging baking oven inwall surrounding, prevents the charged appearance of baking oven
Potential safety hazard, and blocked the metal inner surface generation electromagnetic induction of sample of cable and chamber, reduce result of the test error.
Accompanying drawing explanation
It is clearly understood to make present disclosure be easier to, below according to specific embodiment and combine accompanying drawing, to this
Invention is described in further detail, wherein
Fig. 1 is the schematic diagram of the embodiment of the present invention 1.
Fig. 2 is the sample holder schematic diagram of the present invention.
Fig. 3 is the single sample of cable to be assessed structural representation used in Fig. 1.
Fig. 4 is the schematic diagram of the embodiment of the present invention 2.
Fig. 5 is the three cores sample of cable to be assessed structural representation used in Fig. 4.
Accompanying drawing is numbered:
AC power 1, line resistance 2, high temperature resistant electric power connection line 3, air aging baking oven 4, sample holder 41, card
Groove 41-1, sliding clamp 41-2, conductor 5, insulating barrier 6, metal screen layer 7.
Detailed description of the invention
(embodiment 1)
Seeing Fig. 1, Fig. 2 and Fig. 3, the cross-linked polyethylene insulated cable aging life-span assessment of the wisdom energy of the present embodiment is
System, including AC power 1, line resistance 2, high temperature resistant electric power connection line 3 and air aging baking oven 4；Air aging dries
Sample holder 41 is set in case 4；Sample holder 41 includes draw-in groove 41-1 and fixing slip of sliding in draw-in groove 41-1
Fixture 41-2.Air aging baking oven 4 inwall surrounding arranges epoxy resin backplate.
Aging life-span appraisal procedure, comprises the following steps:
Step one: sample of cable to be assessed to single (structure is as shown in Figure 3) pre-processes, strip cable one end
Outer jacket, according to sample of cable external diameter regulate sliding clamp, the sample of cable handled well is fixed on sample holder 41
On, each sample holder 41 is fixed 3 sample of cables to be assessed.
Step 2: the sample holder 41 fixing sample of cable to be assessed is respectively put into reach design temperature 3
In air aging baking oven 4, temperature is respectively 110 DEG C, 125 DEG C, 135 DEG C, and the inwall surrounding of air aging baking oven 4 is equal
Using epoxy resin board to isolate, the conductor 5 of sample of cable to be assessed connects AC power, sample of cable metallic shield
Layer 7 ground connection, are respectively adopted high temperature resistant connecting line 3 also between the conductor 5 of three assessment sample of cables and between metal screen layer 7
Connection, makes each sample insulating barrier 6 bear electric-field intensity U0 and is accelerated thermal aging test.
Step 3: stop the insulating barrier to the sample of cable to be assessed after step 2 and sample, according to GB/T 2951.11-2008
Method of testing carries out mechanical robustness testing, chooses insulating barrier, the sampling of each sample insulation from sample of cable two ends to be assessed
Number is no less than 2, record the elongation rate of tensile failure of arbitrary sample become before heat ageing ± 50%, the aging time used is i.e.
For the cable aging life-span under Current Temperatures；
Step 4: utilize Arrhenius relationship to fit to curve ln t=E/RT+A, in formula, t the result of step 3
Being the aging reaction time, E is insulating materials activation energy, and R is mol gas constant, and T is aging temperature.Pass through to be surveyed
Ageing time fits to curve with the pass mooring points of temperature, is extrapolated to the service life under cable operating temperature.
(embodiment 2)
Seeing Fig. 4 and Fig. 5, a kind of method of the present embodiment is substantially the same manner as Example 1, and difference is: such as Fig. 5
Shown in, sample of cable to be assessed is three-core cable.
Step one is fixed on each sample holder 41 2 sample of cables to be assessed.
Step 2 uses in advance metal copper wire linked together by three conductors 5 of every sample of cable to be assessed, then connect
Connect AC power, choose any metal screen layer ground connection, two sample of cables in three insulated wire cores of sample of cable to be assessed
Three conductors 5 between and metal screen layer 7 between to be respectively adopted high temperature resistant connecting line 3 in parallel.
Particular embodiments described above, has been carried out the purpose of the present invention, technical scheme and beneficial effect the most in detail
Illustrate, be it should be understood that the specific embodiment that the foregoing is only the present invention, be not limited to the present invention,
All within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, should be included in this
Within bright protection domain.
Claims (9)
1. a wisdom energy cross-linked polyethylene insulated cable aging life-span assesses system, it is characterised in that: include handing over
Stream power supply (1), line resistance (2), high temperature resistant electric power connection line (3) and air aging baking oven (4)；Described air
Sample holder (41) is set in ageing oven (4)；Described sample holder (41) includes draw-in groove (41-1) and at draw-in groove
(41-1) slide in fixing sliding clamp (41-2).
A kind of wisdom energy cross-linked polyethylene insulated cable aging life-span assessment system the most according to claim 1,
It is characterized in that: described air aging baking oven (4) inwall surrounding arranges epoxy resin backplate.
3. a wisdom energy cross-linked polyethylene insulated cable aging life-span appraisal procedure, it is characterised in that: use such as
The wisdom energy described in claim 2 cross-linked polyethylene insulated cable aging life-span assesses system, comprises the following steps:
Step one: sample of cable to be assessed is pre-processed；
Step 2: by sample of cable to be assessed, put into the air aging baking oven reaching design temperature, by electricity to be assessed
Cable sample conductor and insulating barrier connect AC power, carry out heat ageing；
Step 3: stop the insulating barrier to the sample of cable to be assessed after step 2 and sample, according to GB/T 2951.11-2008
Method of testing carries out mechanical robustness testing, record the elongation rate of tensile failure of arbitrary sample become before heat ageing ± 50%, aging
The cable aging life-span that time used is under Current Temperatures；
Step 4: utilize Arrhenius relationship to fit to curve ln t=E/RT+A, in formula, t the result of step 3
Being the aging reaction time, E is insulating materials activation energy, and R is mol gas constant, and T is aging temperature.Pass through to be surveyed
Ageing time fits to curve with the pass mooring points of temperature, is extrapolated to the service life under cable operating temperature.
A kind of wisdom energy cross-linked polyethylene insulated cable aging life-span appraisal procedure the most according to claim 3,
It is characterized in that: the pretreatment of described step one is the outer jacket peeling off sample of cable one end to be assessed, expose conductor with exhausted
Edge layer；If described sample of cable single-core cable to be assessed, Specimen Number is no less than 3；If three-core cable, sample
Number is no less than 2, uses connecting line in parallel between multiple sample of cables to be assessed.
A kind of wisdom energy cross-linked polyethylene insulated cable aging life-span appraisal procedure the most according to claim 3,
It is characterized in that: in described step 2, described air aging baking oven is the ageing oven of known air replacement rate and air velocity.
A kind of wisdom energy cross-linked polyethylene insulated cable aging life-span appraisal procedure the most according to claim 5,
It is characterized in that: in described step 2, described design temperature for exceeding in the range of cable actual motion temperature 30～50 DEG C,
Three temperature environments are at least selected to be accelerated degradation.
A kind of wisdom energy cross-linked polyethylene insulated cable aging life-span appraisal procedure the most according to claim 6,
It is characterized in that: in described step 2, described design temperature is respectively 110 DEG C, 125 DEG C, 135 DEG C, ageing oven
Air exchange frequency 8～20 time/hour.
A kind of wisdom energy cross-linked polyethylene insulated cable aging life-span appraisal procedure the most according to claim 6,
It is characterized in that: in described step 2, sample of cable to be assessed is placed on the slidably specimen holder of air aging baking oven and clips.
A kind of wisdom energy cross-linked polyethylene insulated cable aging life-span appraisal procedure the most according to claim 3,
It is characterized in that: in described step 3, choose insulating barrier, the sampling of each sample insulation from sample of cable two ends to be assessed
Number is no less than 2.
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| CN201610319113.7A CN105866015A (en) | 2016-05-12 | 2016-05-12 | Method and system for evaluating ageing life of crosslinked polyethylene insulating cable for smart energy |
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| CN201610319113.7A CN105866015A (en) | 2016-05-12 | 2016-05-12 | Method and system for evaluating ageing life of crosslinked polyethylene insulating cable for smart energy |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108051364A (en) * | 2017-12-13 | 2018-05-18 | 中国科学院长春应用化学研究所 | A kind of EPR nuclear energy cable residue lifetime estimation method and prediction EPR nuclear energy cable remaining life methods |
| CN109142204A (en) * | 2018-09-03 | 2019-01-04 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of change of current change multifactor aging testing method of sealing element |
| CN109490717A (en) * | 2018-12-29 | 2019-03-19 | 云南电网有限责任公司电力科学研究院 | A kind of threephase cable degradation system and method |
| CN109596920A (en) * | 2018-12-20 | 2019-04-09 | 国网北京市电力公司 | Cable senile experiment device |
| CN112881586A (en) * | 2021-01-20 | 2021-06-01 | 国网江苏省电力有限公司电力科学研究院 | Performance evaluation detection method and system for cable flame-retardant wrapping tape after operation |
| CN112949099A (en) * | 2021-04-28 | 2021-06-11 | 哈尔滨理工大学 | Mathematical model for prediction of electric-heat combined aging life of crosslinked polyethylene cable |
| CN114184488A (en) * | 2021-12-01 | 2022-03-15 | 中海石油(中国)有限公司 | Method for rapidly testing service life of optical cable of oil well |
| CN114324129A (en) * | 2021-12-10 | 2022-04-12 | 国网内蒙古东部电力有限公司电力科学研究院 | Aging simulation device for high-voltage bushing insulating material |
| WO2022100391A1 (en) * | 2020-11-11 | 2022-05-19 | 南方电网科学研究院有限责任公司 | Method for detecting service life of pre-crosslinked material for high-voltage alternating-current cable insulation |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108051364A (en) * | 2017-12-13 | 2018-05-18 | 中国科学院长春应用化学研究所 | A kind of EPR nuclear energy cable residue lifetime estimation method and prediction EPR nuclear energy cable remaining life methods |
| CN109142204A (en) * | 2018-09-03 | 2019-01-04 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of change of current change multifactor aging testing method of sealing element |
| CN109596920A (en) * | 2018-12-20 | 2019-04-09 | 国网北京市电力公司 | Cable senile experiment device |
| CN109490717A (en) * | 2018-12-29 | 2019-03-19 | 云南电网有限责任公司电力科学研究院 | A kind of threephase cable degradation system and method |
| WO2022100391A1 (en) * | 2020-11-11 | 2022-05-19 | 南方电网科学研究院有限责任公司 | Method for detecting service life of pre-crosslinked material for high-voltage alternating-current cable insulation |
| CN112881586A (en) * | 2021-01-20 | 2021-06-01 | 国网江苏省电力有限公司电力科学研究院 | Performance evaluation detection method and system for cable flame-retardant wrapping tape after operation |
| CN112881586B (en) * | 2021-01-20 | 2023-04-14 | 国网江苏省电力有限公司电力科学研究院 | Method for determining failure criterion of flame-retardant wrapping tape of cable and evaluating performance of cable after operation |
| CN112949099A (en) * | 2021-04-28 | 2021-06-11 | 哈尔滨理工大学 | Mathematical model for prediction of electric-heat combined aging life of crosslinked polyethylene cable |
| CN112949099B (en) * | 2021-04-28 | 2022-12-02 | 哈尔滨理工大学 | Mathematical model for predicting electric-heating combined aging life of crosslinked polyethylene cable |
| CN114184488A (en) * | 2021-12-01 | 2022-03-15 | 中海石油(中国)有限公司 | Method for rapidly testing service life of optical cable of oil well |
| CN114184488B (en) * | 2021-12-01 | 2024-01-30 | 中海石油(中国)有限公司 | Quick testing method for service life of optical cable of oil well |
| CN114324129A (en) * | 2021-12-10 | 2022-04-12 | 国网内蒙古东部电力有限公司电力科学研究院 | Aging simulation device for high-voltage bushing insulating material |
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