CN101470058A - Method for evaluating residual service life of marine low-pressure rubber-insulated cable - Google Patents
Method for evaluating residual service life of marine low-pressure rubber-insulated cable Download PDFInfo
- Publication number
- CN101470058A CN101470058A CNA2007101593216A CN200710159321A CN101470058A CN 101470058 A CN101470058 A CN 101470058A CN A2007101593216 A CNA2007101593216 A CN A2007101593216A CN 200710159321 A CN200710159321 A CN 200710159321A CN 101470058 A CN101470058 A CN 101470058A
- Authority
- CN
- China
- Prior art keywords
- cable
- life
- dielectric loss
- loss angle
- angle tangent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The invention discloses a method for evaluating the residual life of low voltage rubber insulation cable used on ships, comprising: processing thermal accelerated aging test on the insulation material of a cable sample; quickly simulating the aging process of the cable; attaining a cable service life equation based on the breaking elongation of the cable insulation material; in each time node of the thermal accelerated aging test, measuring the tangent value of dielectric loss angle of the cable insulation material, to obtain a cable service life equation based on the tangent value of dielectric loss angle of the insulation material and a tangent critical value of the dielectric loss angle at the end of the cable life; evaluating the service life of a low voltage rubber insulation cable of one standard via the two service life equations; according to the tangent value of dielectric loss angle measured in site, using the cable service life equation based on the tangent value of dielectric loss angle to evaluate the residual life of the in-situ cable. The method can quickly and accurately evaluate the residual life of cable in-situ.
Description
Technical field
The invention belongs to insulation of electrical installation diagnostic techniques field, relate to the diagnosis of low-voltage cable state of insulation, specially refer to a kind of method of assessing residual service life of marine low-pressure rubber-insulated cable.
Background technology
Shipboard cable mostly is low-pressure rubber-insulated cable, and so-called low-voltage cable is meant that rated voltage is lower than the cable of 1kV.For ship power and illuminating line, the India-rubber cable that adopts in use because the oxygenolysis of rubber changes the physical and mechanical properties of vulcanized rubber: hardening, become fragile, form crackle on rubber, air and moisture are filled in the crackle.Above-mentioned factor all can be quickened the aging of cable insulation layer material, and the narrow and small of space is difficult to carry out detection and maintenance in the cabin, is difficult to scent a hidden danger the localization of faults.
The insulation technology state of shipboard cable is normally according to the evaluation of the tour of the analysis of shipping data, maintainer's inquiry, cable trace and insulation resistance determined.Can confirm by check test whether cable is fit to operation, but can not determine the ability to work of cable under the impaired condition (increase of superpotential, transition humidity, working current etc.), especially remain mission life.To the definite evaluation of the present insulation technology state of cable not only the viewpoint of collateral security marine vessel power equipment work reliability be important, and also be very important from the angle of fire preventing.Being noted that when boats and ships keep in repair changing cable is the very expensive and heavy operation of a price, not having the replacing of abundant foundation maybe must change and do not implement, all is unallowed.
Aging at cable insulation fault and cable insulation, over nearly 30 years, research institution and laboratory have proposed numerous test methods and means both at home and abroad, and be as shown in table 1.
Table 1 cable testing method
| The pilot project title | Test type | The pilot project title | Test type |
| DC voltage withstand test | Off-line, destructiveness | Power frequency withstand test | Off-line, destructiveness |
| The frequency conversion resonance vibration pressure-proof test | Off-line, destructiveness | 0.1Hz Ultra-low frequency voltage endurance test | Off-line, destructiveness |
| The oscillating voltage test | Off-line, destructiveness | Partial discharge test | Off-line, non-destructive |
| Return voltage | Off-line, non-destructive | The dielectric loss angle tangent test | Off-line, non-destructive |
| Dc superposition method | Online, non-destructive | Exchange method of superposition | Online, non-destructive |
| The flip-flop method | Online, non-destructive | The harmonic component method | Online, non-destructive |
So far, having different views of relevant both at home and abroad these test methods of expert opinion is bigger, except DC voltage withstand test be acknowledged as invalid and harmful, other pilot projects and method still are in continuous exploration and conceptual phase.All there are many immature, imperfection parts in above-mentioned test method, its actual operability, with the equivalence of power-frequency voltage test, find that the validity etc. of cable insulation early defect is still among research, accumulation operating experience process.Secondly, no matter preventive trial adopts above-mentioned which kind of test method, its selected trial voltage is all very high, is actually cable major insulation is once damaged, and has correspondingly shortened the cable running safety life-span.
Shipboard cable to the requirement of detection technique is: off-line, online and non-destructive, promptly can realize having a power failure detection, charged detection and test voltage are lower than the specified power-frequency voltage (U of cable
0).Result according to Literature Consult, 0.1Hz sinusoidal voltage test, dielectric loss angle tangent test and insulation resistance test can satisfy the requirement of shipboard cable detection technique, but the employed test voltage of above-mentioned method of testing can not surpass the rated operational voltage of cable, is applied to shipboard cable insulation technology state-detection and has following problem:
(1) shipboard cable is the rubber-covered low-voltage cable, the result of study of all documents of finding at present all is at middle and high piezoelectric forces cable, cable insulation material is generally tygon (PE), crosslinked polyethylene (XLPE), polyvinyl chloride (PVC) and paper medium insulated cable (PILC), so the shipboard cable insulation detects the support that lacks the literature research result;
(2) because shipboard cable is a low-voltage cable, in other industry, as power industry, the low-voltage cable accessibility is good, the replacing quantities is little, the cable preventive trial can use disruptive method, the timely cable of changing in back of pinpointing the problems can be dealt with problems, therefore the research of the insulation lossless detection method of low-voltage cable does not cause enough attention, also lack relevant criterion and criterion, and the experimental technique of cable lags significantly behind the manufacturing technology and the application technology of cable at present, original standard, rules, for example in " power equipment preventive trial rules ", only usefulness length is seldom mentioned the pre-method for testing after cable puts into operation, and does not have operability;
(3) though the test of 0.1Hz sinusoidal voltage, dielectric loss angle tangent test and insulation resistance test can satisfy the requirement of shipboard cable detection technique, but be engaged in the state of insulation evaluation work of shipboard cable at present without any unit, do not retrieve the data of construction value yet, lack the reference of historical data data.
Summary of the invention
The purpose of this invention is to provide a kind of method that can effectively assess residual service life of marine low-pressure rubber-insulated cable, reach the purpose of comparatively accurately and rapidly assessing residual service life of marine low-pressure rubber-insulated cable.
Technical scheme of the present invention is that the chamber test is assessed residual service life of marine low-pressure rubber-insulated cable in conjunction with the method for on-the-spot test by experiment, and it comprises the steps:
(1) insulating material to cable sample carries out accelerating thermal aging test, the ageing process of quick dummycable, stopping index-cable rubber breaking elongation (breaking elongation of cable insulation material drops to 150%) with internationally recognized cable insulation aging life-span is criterion, along with the growth of quickening thermal aging time, monotonicity will take place the breaking elongation of cable insulation material changes, and obtains the cable life equation based on the cable insulation material breaking elongation.This life-span equation should have following form:
Log τ=a+b/T formula (1)
τ-product is in the life-span of temperature T condition work in the formula; T-working temperature (absolute temperature K); A, b-and the relevant coefficient of material heat ageing essence;
(2) cable insulation material is quickened in each timing node of heat ageing, measure the dielectric loss angle tangent of cable insulation material simultaneously, the critical value of the dielectric loss angle tangent of (breaking elongation of cable insulation material drops to 150%) when acquisition stops based on the cable life equation of cable insulation material dielectric loss angle tangent and cable life, this life-span equation should have following form:
Tan δ=Aexp (Y/B)+C formula (2)
Wherein, A, B, C are undetermined constant, and be relevant with the insulating material and the structure of cable; Y is the use year number of cable;
(3) to low-pressure rubber-insulated cable with a kind of specifications and models, utilize two kinds of life-span equations of acquisition in (1) and (2) that its life-span is judged, be benchmark with the result of determination of formula (1), the result of formula (2) is verified and revises;
(4) in the field engineering implementation process of cable insulation technique state estimation, the breaking elongation of cable insulation material is can not detected parameter, and the dielectric loss value of cable insulation material is on-the-spot detectable amount.Therefore,, utilize the life-span equation of formula (2), can make judgement to the residual life of on-site cable rapidly according to the dielectric loss angle tangent that measures in the field engineering implementation process.
The present invention follows following principle in the process that obtains the cable life equation:
(1) determines the temperature range of thermal aging test, and in this temperature range, choose the accelerating thermal aging test that 3～5 test temperatures are carried out product.
(2) selection in acceleration heat ageing cycle.During accelerating thermal aging test, the cycle is generally got 6～10, counts with the actual measurement that draws aging curve under each test temperature.If aging curve is an index law, all period interval just adopt geometric progression, promptly 1,2,4,8,16 ... Deng.If aging curve is linear rule, all period interval just adopt arithmetic series, promptly 2,4,6,8,10 ... Deng.Last point should be near near the end-of-life index.
(3) the selected performance parameter that can reflect the parameter of test product main performance as examination, this performance parameter should be able to reflect the most delicately that test product changes the ground rule with thermal aging time, can test exactly, test figure has better repeatability etc.And selected this parameter is when being lower than some values, promptly as the critical value of end-of-life.The present invention selects the breaking elongation of cable insulation material and dielectric loss angle tangent as performance assessment criteria.
(4) under each selected ground temperature, carry out thermal aging test, obtain the relation curve of test product performance parameter and thermal aging time under each temperature, be called aging curve.
Aging curve under each temperature can be listed the aging curve equation.The critical value (during end-of-life) that aging curve is extended to performance parameter is the life time under a certain temperature, and this life time also can be tried to achieve from the aging curve equation.
(5) relation of life time under each temperature and temperature being made curve, is exactly the life curve of product to be tested.Can list the equation of life curve equally according to curve.Can determine the mission life of product under a certain temperature from life curve.
Effect of the present invention and benefit are as follows, the method of the assessment residual service life of marine low-pressure rubber-insulated cable that the present invention proposes can be made rapidly the residual life of cable and assessment accurately at the scene, for the maintenance and the replacing of shipboard cable provides foundation accurately, a large amount of evaluation times and expense have effectively been saved.In addition, this technology also can be used for assessing the marine low-pressure cable of other types insulating material.
Embodiment
The residual life of the main cable of not changing with certain ship of navigating by water 40 years of assessment is that example elaborates to the present invention.The detail parameters of cable is as shown in table 2.
The dried cable data of certain shipowner of table 2
| Length (m) | The core number | Specification (mm 2) | Insulation | Outer jacket | Lay the time | The cable model |
| 10 | 1 | 185 | EP rubbers | Neoprene | 40 years | CEF |
(1) based on the cable life equation of cable insulation material breaking elongation
Insulating material EP rubbers to cable carries out accelerating thermal aging test, and the nominal operation temperature of cable is 85 ℃, and the accelerating thermal aging test equilibrium temperature is selected 100 ℃, and 110 ℃, 120 ℃.The breaking elongation test result of cable insulation material is as shown in table 3.
The breaking elongation test result of table 3 accelerating thermal aging test
According to the data of accelerated aging test, use linear regression analysis, can calculate and reduce to 150% with breaking elongation is the thermal lifetime equation of the cable insulation material EP rubbers of failure criteria:
logτ＝-11.654+5417/T
Wherein, τ is the aging life-span of EP rubbers; T is the running temperature of cable.
If 40 ℃ of the average running temperatures of cable, then the life-span of cable is 50 years, and then remaining mission life is 10 years.
(2) based on the cable life equation of cable insulation material dielectric loss angle tangent
Insulating material EP rubbers to cable carries out accelerating thermal aging test, and the nominal operation temperature of cable is 85 ℃, and the accelerating thermal aging test equilibrium temperature is selected 100 ℃, and 110 ℃, 120 ℃, the dielectric loss test data of cable insulation material is as shown in table 4.
The dielectric loss test result of table 4 accelerating thermal aging test
Test figure is carried out the relational expression that theoretical analysis obtains is:
tanδ＝Aexp(Y/B)+C
Wherein, A, B, C are undetermined constant, and be relevant with the insulating material and the structure of cable; Y is the use year number of cable.Numerical analysis is the result obtain: to ethylene propylene rubber insulated cable, and A=0.08, B=28.5, C=0.01,
Be tan δ=0.08exp (Y/28.5)+0.01
It is 48 years that the critical data 0.5 of the dielectric loss angle tangent when stopping with second third cable life is brought the cable life that above-mentioned equation obtains into, and the residue mission life is 8 years, and this is approaching with the result based on the cable life equation of cable insulation material breaking elongation.
(3) dielectric loss angle tangent of certain ship cable of field engineering measurement is 0.26751, utilizes the equation that obtains in (2), and year number that lays of cable is 41 years, and is approaching consistent with the actual year number that lays, and proved the accuracy of this equation.
Claims (4)
1, a kind of method of assessing residual service life of marine low-pressure rubber-insulated cable, its feature comprises the steps:
(1) insulating material to cable sample carries out accelerating thermal aging test, and the ageing process of dummycable is obtained the cable life equation based on the cable insulation material breaking elongation fast;
(2) in carrying out each timing node of accelerating thermal aging test, measure the dielectric loss angle tangent of cable insulation material simultaneously, obtain the critical value of the dielectric loss angle tangent when stopping based on the cable life equation of insulating material dielectric loss angle tangent and cable life;
(3), utilize two kinds of life-span equations that its life-span is assessed to low-pressure rubber-insulated cable with a kind of specifications and models;
(4) according to the dielectric loss angle tangent of in-site measurement, utilize and the residual life of on-site cable is made assessment based on the cable life equation of dielectric loss angle tangent.
2, a kind of method of assessing residual service life of marine low-pressure rubber-insulated cable according to claim 1, it is characterized in that, described based on the cable insulation material dielectric loss angle tangent the cable life equation and the critical value of the dielectric loss angle tangent of cable life when stopping.
3, a kind of method of assessing residual service life of marine low-pressure rubber-insulated cable according to claim 1, it is characterized in that, described dielectric loss angle tangent according to in-site measurement utilizes and based on the cable life equation of dielectric loss angle tangent the residual life of on-site cable is made assessment.
4, a kind of method of assessing residual service life of marine low-pressure rubber-insulated cable according to claim 1 is characterized in that, the measuring voltage of described dielectric loss angle tangent is lower than the rated operational voltage of cable, belongs to Non-Destructive Testing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101593216A CN101470058B (en) | 2007-12-27 | 2007-12-27 | Method for evaluating residual service life of marine low-pressure rubber-insulated cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101593216A CN101470058B (en) | 2007-12-27 | 2007-12-27 | Method for evaluating residual service life of marine low-pressure rubber-insulated cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101470058A true CN101470058A (en) | 2009-07-01 |
| CN101470058B CN101470058B (en) | 2012-05-16 |
Family
ID=40827735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101593216A Expired - Fee Related CN101470058B (en) | 2007-12-27 | 2007-12-27 | Method for evaluating residual service life of marine low-pressure rubber-insulated cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101470058B (en) |
Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818975A (en) * | 2012-08-03 | 2012-12-12 | 上海市电力公司 | Method for forecasting insulation aging of cable |
| CN102944777A (en) * | 2012-10-31 | 2013-02-27 | 广州供电局有限公司 | Method for detecting service life of cable |
| CN103472363A (en) * | 2012-06-06 | 2013-12-25 | 宝山钢铁股份有限公司 | Crosslinked polyethylene cable residual life assessment method |
| CN104049154A (en) * | 2013-03-11 | 2014-09-17 | 江苏核电有限公司 | Sample reservation method for nuclear-power-station reactor control protection system cable |
| CN104794330A (en) * | 2015-04-03 | 2015-07-22 | 国家电网公司 | Middle-high-voltage power cable residual life evaluation method considering stress randomness |
| CN105388403A (en) * | 2015-11-09 | 2016-03-09 | 大连理工大学 | Hardness-retention-rate-based rapid detection method of residual life of low-voltage cable |
| CN105445626A (en) * | 2015-11-09 | 2016-03-30 | 西北工业大学 | Residual life evaluation method for low-voltage and multi-core cable |
| CN105486832A (en) * | 2015-12-30 | 2016-04-13 | 深圳供电局有限公司 | Method for assessing insulation aging state of cable |
| CN105675642A (en) * | 2016-01-18 | 2016-06-15 | 中国兵器工业第五九研究所 | Semi-quantitative assessment test and data processing method for storage life in condition with single temperature |
| CN105866015A (en) * | 2016-05-12 | 2016-08-17 | 远东电缆有限公司 | Method and system for evaluating ageing life of crosslinked polyethylene insulating cable for smart energy |
| CN105866647A (en) * | 2016-06-08 | 2016-08-17 | 西安交通大学 | XLPE (Cross Linked Polythylene) insulation aging estimation method based on different frequency and dielectric loss ratios |
| CN106124191A (en) * | 2016-08-31 | 2016-11-16 | 中国兵器工业第五九研究所 | A kind of residue lifetime estimation method of rubber seal |
| CN106199350A (en) * | 2016-06-27 | 2016-12-07 | 上海电力学院 | A kind of rubber plastic cable insulation ag(e)ing state evaluating method |
| CN106645980A (en) * | 2016-12-29 | 2017-05-10 | 北京世纪航凯电力科技股份有限公司 | Dynamic continuous medium loss measuring system and method for high voltage cable |
| CN106644916A (en) * | 2017-03-06 | 2017-05-10 | 大连理工大学 | Method for evaluating ageing life of cable insulation material for ship |
| CN106872070A (en) * | 2016-12-29 | 2017-06-20 | 大连银海贡创科技发展有限公司 | A kind of optical fiber composite cable expert diagnostic system based on many reference amounts |
| 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 |
| CN108287174A (en) * | 2018-01-25 | 2018-07-17 | 西华大学 | Bus duct life-span prediction method based on the loss of alternating temperature lower thermal life |
| CN108426926A (en) * | 2018-03-12 | 2018-08-21 | 中国科学院生态环境研究中心 | A kind of device that based on dielectric loss angle tangent micro- plastics are detected with identification |
| CN110907287A (en) * | 2019-12-10 | 2020-03-24 | 中广核高新核材科技（苏州）有限公司 | Method for evaluating service life of composite material cable bridge |
| CN111289863A (en) * | 2020-03-30 | 2020-06-16 | 国网山东省电力公司聊城供电公司 | Power cable middle joint insulation detection method based on dielectric spectrum method |
| 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 |
| CN112557839A (en) * | 2020-11-24 | 2021-03-26 | 西南交通大学 | Method for evaluating thermo-oxidative aging degree of ethylene propylene rubber cable of motor train unit |
| CN112557841A (en) * | 2020-11-24 | 2021-03-26 | 西南交通大学 | Vehicle-mounted EPR cable state evaluation method based on calculation of insulation layer hardness |
| CN112946431A (en) * | 2021-01-27 | 2021-06-11 | 广东工业大学 | Evaluation method for insulation thermal aging of vehicle-mounted cable based on polarization detection |
| CN113125909A (en) * | 2021-04-19 | 2021-07-16 | 国网江苏省电力有限公司泰州供电分公司 | Method for determining residual life of cable |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2265215C1 (en) * | 2004-07-19 | 2005-11-27 | Восточно-Сибирский государственный технологический университет | Method for determining pickling extent of leather web |
| CN100403042C (en) * | 2006-03-06 | 2008-07-16 | 西安交通大学 | Insulating state on-line monitoring method of cross-linked PE cable |
-
2007
- 2007-12-27 CN CN2007101593216A patent/CN101470058B/en not_active Expired - Fee Related
Cited By (37)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472363A (en) * | 2012-06-06 | 2013-12-25 | 宝山钢铁股份有限公司 | Crosslinked polyethylene cable residual life assessment method |
| CN103472363B (en) * | 2012-06-06 | 2016-01-27 | 宝山钢铁股份有限公司 | Twisted polyethylene cable residual life assessment method |
| CN102818975A (en) * | 2012-08-03 | 2012-12-12 | 上海市电力公司 | Method for forecasting insulation aging of cable |
| CN102944777A (en) * | 2012-10-31 | 2013-02-27 | 广州供电局有限公司 | Method for detecting service life of cable |
| CN102944777B (en) * | 2012-10-31 | 2016-03-30 | 广州供电局有限公司 | Cable detection method in serviceable life |
| CN104049154A (en) * | 2013-03-11 | 2014-09-17 | 江苏核电有限公司 | Sample reservation method for nuclear-power-station reactor control protection system cable |
| CN104794330B (en) * | 2015-04-03 | 2018-01-19 | 国家电网公司 | The middle-high voltage power cable residue lifetime estimation method of meter and stress randomness |
| CN104794330A (en) * | 2015-04-03 | 2015-07-22 | 国家电网公司 | Middle-high-voltage power cable residual life evaluation method considering stress randomness |
| CN105388403A (en) * | 2015-11-09 | 2016-03-09 | 大连理工大学 | Hardness-retention-rate-based rapid detection method of residual life of low-voltage cable |
| CN105445626A (en) * | 2015-11-09 | 2016-03-30 | 西北工业大学 | Residual life evaluation method for low-voltage and multi-core cable |
| CN105445626B (en) * | 2015-11-09 | 2018-08-24 | 西北工业大学 | A kind of low pressure multicore cable residue lifetime estimation method |
| CN105388403B (en) * | 2015-11-09 | 2018-05-08 | 大连理工大学 | A kind of low-voltage cable remaining life quick determination method based on hardness retention rate |
| CN105486832A (en) * | 2015-12-30 | 2016-04-13 | 深圳供电局有限公司 | Method for assessing insulation aging state of cable |
| CN105675642A (en) * | 2016-01-18 | 2016-06-15 | 中国兵器工业第五九研究所 | Semi-quantitative assessment test and data processing method for storage life in condition with single temperature |
| CN105866015A (en) * | 2016-05-12 | 2016-08-17 | 远东电缆有限公司 | Method and system for evaluating ageing life of crosslinked polyethylene insulating cable for smart energy |
| CN105866647A (en) * | 2016-06-08 | 2016-08-17 | 西安交通大学 | XLPE (Cross Linked Polythylene) insulation aging estimation method based on different frequency and dielectric loss ratios |
| CN105866647B (en) * | 2016-06-08 | 2018-08-31 | 西安交通大学 | XLPE insulation ag(e)ing state evaluating methods based on different frequency dielectric loss ratio |
| CN106199350B (en) * | 2016-06-27 | 2019-04-26 | 国网上海市电力公司 | A kind of rubber plastic cable insulation ag(e)ing state evaluating method |
| CN106199350A (en) * | 2016-06-27 | 2016-12-07 | 上海电力学院 | A kind of rubber plastic cable insulation ag(e)ing state evaluating method |
| CN106124191A (en) * | 2016-08-31 | 2016-11-16 | 中国兵器工业第五九研究所 | A kind of residue lifetime estimation method of rubber seal |
| CN106645980A (en) * | 2016-12-29 | 2017-05-10 | 北京世纪航凯电力科技股份有限公司 | Dynamic continuous medium loss measuring system and method for high voltage cable |
| CN106872070A (en) * | 2016-12-29 | 2017-06-20 | 大连银海贡创科技发展有限公司 | A kind of optical fiber composite cable expert diagnostic system based on many reference amounts |
| CN106644916A (en) * | 2017-03-06 | 2017-05-10 | 大连理工大学 | Method for evaluating ageing life of cable insulation material for ship |
| 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 |
| CN108287174A (en) * | 2018-01-25 | 2018-07-17 | 西华大学 | Bus duct life-span prediction method based on the loss of alternating temperature lower thermal life |
| CN108426926B (en) * | 2018-03-12 | 2020-04-14 | 中国科学院生态环境研究中心 | Device for detecting and identifying micro plastic based on dielectric loss tangent value |
| CN108426926A (en) * | 2018-03-12 | 2018-08-21 | 中国科学院生态环境研究中心 | A kind of device that based on dielectric loss angle tangent micro- plastics are detected with identification |
| CN110907287A (en) * | 2019-12-10 | 2020-03-24 | 中广核高新核材科技（苏州）有限公司 | Method for evaluating service life of composite material cable bridge |
| CN111289863A (en) * | 2020-03-30 | 2020-06-16 | 国网山东省电力公司聊城供电公司 | Power cable middle joint insulation detection method based on dielectric spectrum method |
| 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 |
| CN112557839A (en) * | 2020-11-24 | 2021-03-26 | 西南交通大学 | Method for evaluating thermo-oxidative aging degree of ethylene propylene rubber cable of motor train unit |
| CN112557841A (en) * | 2020-11-24 | 2021-03-26 | 西南交通大学 | Vehicle-mounted EPR cable state evaluation method based on calculation of insulation layer hardness |
| CN112557839B (en) * | 2020-11-24 | 2021-09-24 | 西南交通大学 | Method for evaluating thermo-oxidative aging degree of ethylene propylene rubber cable of motor train unit |
| CN112946431A (en) * | 2021-01-27 | 2021-06-11 | 广东工业大学 | Evaluation method for insulation thermal aging of vehicle-mounted cable based on polarization detection |
| CN112946431B (en) * | 2021-01-27 | 2022-08-12 | 广东工业大学 | Evaluation method for insulation thermal aging of vehicle-mounted cable based on polarization detection |
| CN113125909A (en) * | 2021-04-19 | 2021-07-16 | 国网江苏省电力有限公司泰州供电分公司 | Method for determining residual life of cable |
| CN113125909B (en) * | 2021-04-19 | 2022-10-28 | 国网江苏省电力有限公司泰州供电分公司 | Method for determining residual life of cable |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101470058B (en) | 2012-05-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101470058B (en) | Method for evaluating residual service life of marine low-pressure rubber-insulated cable | |
| CN106644916A (en) | Method for evaluating ageing life of cable insulation material for ship | |
| CN105388403B (en) | A kind of low-voltage cable remaining life quick determination method based on hardness retention rate | |
| TW201504637A (en) | Method for evaluating cable aging and deterioration by using slice sampling | |
| CN106093614A (en) | A kind of method of return voltage initial slope assessment transformer insulation state | |
| CN112257232B (en) | Life model establishing method based on ethanol in oil and transformer paper polymerization degree | |
| CN108051364A (en) | A kind of EPR nuclear energy cable residue lifetime estimation method and prediction EPR nuclear energy cable remaining life methods | |
| CN104459486A (en) | Method for evaluating insulation of crosslinked polyethylene medium-voltage cable through polarization current | |
| Arvind et al. | Condition monitoring of power transformer: A review | |
| Ohlen et al. | Dielectric frequency response and temperature dependence of power factor | |
| CN105445626B (en) | A kind of low pressure multicore cable residue lifetime estimation method | |
| Rux et al. | Assessing the condition of hydrogenerator stator winding insulation using the ramped high direct-voltage test method | |
| Schwarz et al. | Diagnostic methods for transformers | |
| RU2373546C2 (en) | Method of determination of condition and resource of isolation | |
| Verma et al. | Generation of furanic compounds in transformer oil under accelerated thermal and electrical stress | |
| Joshi et al. | Dielectric diagnosis of EHV current transformer using frequency domain spectroscopy (FDS) & polarization and depolarization current (PDC) techniques | |
| CN108375537A (en) | Cable for ship insulation life detection method based on biggest quality minimizing speed | |
| CN102928748A (en) | Test method and test system for water-soaking pressure resistance of double metal piece type waterproof temperature controller | |
| Münster et al. | Optical sensor for determining the degree of polymerization of the insulation paper inside transformers | |
| Aakre et al. | Review of partial discharge and dielectric loss tests for hydropower generator bars | |
| Kangozhin et al. | Thermal diagnostics of oil-filled equipment under operating voltage | |
| Thango et al. | Empirical Based Approaches to Evaluating the Residual Life for Oil-Immersed Transformers—A Case Study | |
| Krishnan et al. | Review of the Monitoring Diagnostic Methods of Oil Immersed Transformers | |
| Iacob et al. | Lifetime Estimation of Vehicle Alternators | |
| Vandermaar | Condition assessment of power transformers |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120516 Termination date: 20211227 |