CN103439639A - XLPE cable insulation aging state assessment method - Google Patents
XLPE cable insulation aging state assessment method Download PDFInfo
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- CN103439639A CN103439639A CN2013104065941A CN201310406594A CN103439639A CN 103439639 A CN103439639 A CN 103439639A CN 2013104065941 A CN2013104065941 A CN 2013104065941A CN 201310406594 A CN201310406594 A CN 201310406594A CN 103439639 A CN103439639 A CN 103439639A
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Abstract
The invention relates to an XLPE cable insulation aging state assessment method. The method comprises: establishing an XLPE cable insulation accelerated ageing test device; simulating the aging salutation of an XLPE cable insulation layer in actual operation; analyzing the change of XLPE cable insulation dielectric and physical and chemical performance before and after an accelerated ageing test through testing, wherein the change comprises such aspects as a wideband dielectric loss frequency spectrum and a Fourier transformation infrared light spectrum; and evaluating the aging situation.
Description
Technical field
The present invention relates to insulating material aging assessment field, relate in particular to novel XLPE cable insulation ag(e)ing state evaluating method.
Background technology
Along with developing rapidly of city and modern industry, crosslinked polyethylene (XLPE) power cable because its excellent electric property and transmission capacity are large, good heat resistance, be easy to the advantages such as bending, attachment tab is simple, mounting and installation is convenient and be widely used in city transmission line of electricity and power distribution network.In dry environment, the electric property of cable insulation is very superior, yet, after cable puts into operation, the effect that will be subject to the factors such as electricity, heat, humidity, machinery, chemistry occurs aging.The 35kV of China's operation at present and the XLPE cable of above high pressure, some has progressed into " midlife " of cable expected life.Therefore, how to assess the ageing state of these XLPE cable insulation, when judgement should be changed, avoids causing the accident because cable insulation is aging, becomes a current important topic.
For XLPE cable insulation ag(e)ing state evaluating method, just started the external sixties in 20th century to detect the research with aging detection technique about XLPE cable insulation weakness, so far still at development.Japan carries out XLPE cable insulation ag(e)ing detection technique research country early.For the 6kV level, detection technique has non-online and online.Non-online residual voltage, back suction receipts electric current, DC leakage-current, potential decay method, residual charge, the DC voltage method of superposition etc. of comprising.Online flip-flop, the Fluctuation Method of comprising, DC voltage method of superposition etc.XLPE cable insulation ag(e)ing state estimation research is domestic carry out more late, the online measuring technique that can apply at power department and relevant device that Site Detection XLPE insulation ag(e)ing is not at present also generally acknowledged, therefore the data accumulation of cable insulation ageing state is less, lacks and differentiates the aging standard of cable.The present invention has set up the insulation accelerated ageing test apparatus of a kind of XLPE cable, the aging conditions of XLPE cable insulation course in the simulation actual motion.By the dielectric of XLPE cable insulation before and after the test analysis accelerated aging test and the variation of physicochemical property, comprise wideband dielectric loss frequency spectrum, Fourier's infrared spectrum, its ageing state is assessed.The method can become the important detection means that Utilities Electric Co. carries out the assessment of XLPE cable ageing state, provide technical support the tenure of use of improving power cable for the ageing state of Utilities Electric Co.'s accurate evaluation power cable and operating management department, to promoting the XLPE cable power supply reliability, reducing operation and maintenance cost important in inhibiting.
Purpose
The object of the present invention is to provide a kind of XLPE cable insulation ag(e)ing state evaluating method.
Technical scheme
The technical solution adopted for the present invention to solve the technical problems is: set up the insulation accelerated ageing test apparatus of a kind of XLPE cable, the aging conditions of XLPE cable insulation course in the simulation actual motion.By the dielectric of XLPE cable insulation before and after the test analysis accelerated aging test and the variation of physicochemical property, comprise wideband dielectric loss frequency spectrum, Fourier's infrared spectrum, its ageing state is assessed.
Beneficial effect
Advantage of the present invention and beneficial effect:
(1) set up the insulation accelerated ageing test apparatus of a kind of XLPE cable, can be used for simulating XLPE cable in actual motion
The aging conditions of insulation course.
(2) provide a kind of ageing state to the XLPE cable insulation to carry out the method for effective accurate evaluation.
The accompanying drawing explanation
Fig. 1 is the insulation accelerated ageing test apparatus of XLPE cable;
Fig. 2 is aging front and back XLPE sample wideband dielectric loss frequency spectrograms;
Fig. 3 is aging front and back XLPE sample Fourier infrared spectrograms;
Preferred forms
Electric aging and heat ageing is the topmost factor of current XLPE cable insulation ag(e)ing, in order effectively to simulate the aging conditions of XLPE cable insulation course in actual motion, set up the insulation accelerated ageing test apparatus of a kind of XLPE cable, as shown in Figure 1, prepare test and use aging sample, then its dielectric and physicochemical property are carried out to test analysis.The described XLPE cable ageing state of this patent appraisal procedure, implementation step comprises: prepare aging sample, test dielectric and the physicochemical property of aging front and back sample.Specific as follows:
1. preparation process
(1) the former pellet of getting the preparation XLPE cable directly on vulcanizing press under 180 ℃, 10MPa pressure hot pressing 3 minutes in flakes, thickness 1mm, naturally cooling under room temperature, obtain the square sample that length width is 200mm.
(2) above-mentioned square sample is processed into to the square sample that length width is 50mm, is placed between two equal diameter cylindrical electrodes.Electrode diameter is (25 ± 1) mm, high about 25mm, and its edge is rounded to the circular arc that radius is (3.0 ± 0.2) mm, and the accurate centering of upper/lower electrode is placed.The upper end cylinder electrode is close to specimen surface and is connected with high-voltage power supply, back electrode ground connection.By electrode together with the whole constant temperature roaster cavity that is placed in of sample.
(3) sample is applied to the power-frequency voltage of 10kV, temperature setting is set to 90 ℃ in constant temperature roaster, in succession carries out after the electric heating associating aging test of 100h, 200h, 300h taking out standby.
(4) will test the gained sample and clean in absolute ethyl alcohol, then carry out the ultrasonic cleaning processing, remove the impact of surface impurity.2. test experiments
(1) wideband dielectric loss frequency spectrum test
The sample prepared is taken out after two hours at 50 ℃ of constant temperature oven inner dryings, and the sample upper and lower surface is coated to conductive silver glue, treat the dielectric loss frequency spectrum test frequently of the dry laggard line width of conductive silver glue.Use the Novo Control Concept40 wideband dielectric Impedance Analysis instrument test frequency of German import at 5*10
-2～10
3the dielectric loss value of sample while changing in the Hz scope, test is carried out under room temperature, vacuum condition, and test voltage is the 1kV alternating voltage.Obtain result as shown in Figure 2, as can be seen from the figure, its wideband dielectric loss spectrum curve of the sample of different digestion times has notable difference.Along with the increase of digestion time, the dielectric loss value of XLPE sample all has obvious increase on whole frequency spectrum, and the low frequency part trend below 1Hz is more obvious.There are obvious correlativity in dielectric loss frequency spectrum and its degree of aging that the XLPE sample is described.Therefore can be used for assessing XLPE cable insulation ag(e)ing state to the measurement of dielectric loss frequency spectrum.
(2) Fourier's infrared spectrum
Adopt the TENSOR-27 type infrared spectrometric analyzer of German BRUKER company to be analyzed sample.In experiment, the square sample of the 50mmx50mm that makes is carried out to infrared light scanning, experimental result is read by dedicated analysis software OPUS-Viewer.Obtain result as shown in Figure 3, as can be seen from the figure, the sample of different digestion times is at wave number 1720cm
-1and 1600cm
-1near absorbance log has notable difference, and these two wave bands are corresponding C=O keys and C=C key respectively, illustrates in ageing process oxidation and degraded have occurred.Along with the increase of digestion time, on the absorbance log of XLPE sample on these two wave bands, obvious increase is all arranged.There are obvious correlativity in infrared spectrum and its degree of aging that the XLPE sample is described.Therefore also can be used for assessing XLPE cable insulation ag(e)ing state by the measurement to infrared spectrum.
In a word, the inventive method is simple to operate, is easy to realize, can fast and effeciently to the ageing state of XLPE cable insulation, be assessed.
Claims (2)
- Patent of the present invention relates to a kind of XLPE cable insulation ag(e)ing state evaluating method, and it comprises:1. set up the insulation accelerated ageing test apparatus of a kind of XLPE cable, the aging conditions of XLPE cable insulation course in the simulation actual motion.
- 2. by the dielectric of XLPE cable insulation before and after the test analysis accelerated aging test and the variation of physicochemical property, comprise wideband dielectric loss frequency spectrum, Fourier's infrared spectrum, its ageing state is assessed.
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| CN104122465A (en) * | 2014-07-22 | 2014-10-29 | 西安交通大学 | Device and method for united aging of multi-group piece-shaped samples under voltage temperature gradient |
| CN104267322A (en) * | 2014-10-11 | 2015-01-07 | 南宁市第一中学 | Method for detecting aging of cable insulator |
| CN104330711A (en) * | 2014-10-27 | 2015-02-04 | 华北电力大学 | Saturated reactor insulation accelerated aging test device and test method |
| CN104793111A (en) * | 2015-03-31 | 2015-07-22 | 华南理工大学 | Insulating cable residual service life comprehensive evaluation method based on physical, chemical and electric properties |
| CN105259486A (en) * | 2015-11-17 | 2016-01-20 | 华中科技大学 | Aging site rapid diagnosis method for 10 kV XLPE cable based on polarization current measurement |
| 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 |
| CN105842598A (en) * | 2016-06-14 | 2016-08-10 | 国家电网公司 | Cross-linked polyethylene cable life detection method |
| CN106291280A (en) * | 2016-08-04 | 2017-01-04 | 国网天津市电力公司 | XLPE cable based on wideband dielectric Measured By Impedance Spectroscopy insulation degree of purity appraisal procedure |
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| CN107797035A (en) * | 2017-10-12 | 2018-03-13 | 国网天津市电力公司电力科学研究院 | XLPE insulating performance of cable appraisal procedures based on wideband dielectric Measured By Impedance Spectroscopy |
| CN109557431A (en) * | 2018-11-19 | 2019-04-02 | 国网北京市电力公司 | A kind of immersion measurement method based on XLPE cable insulation tabletting sample |
| CN110186513A (en) * | 2019-06-18 | 2019-08-30 | 重庆大学 | A kind of characterizing method of sea cable crosslinked polyethylene insulation material aging |
| CN110632483A (en) * | 2019-11-03 | 2019-12-31 | 西南交通大学 | Service life estimation method of EPR cable based on multi-scale space spectrogram information |
| CN111060472A (en) * | 2019-12-23 | 2020-04-24 | 重庆大学 | Method for characterizing and analyzing aging state of crosslinked polyethylene submarine cable insulating material |
| CN112557842A (en) * | 2020-11-24 | 2021-03-26 | 西南交通大学 | XLPE cable aging state evaluation method based on dielectric constant evaluation factor |
| CN113484694A (en) * | 2021-06-23 | 2021-10-08 | 四川大学 | FDR wave crest displacement measurement and calculation wave velocity cable insulation performance evaluation method |
| CN116643132A (en) * | 2023-07-26 | 2023-08-25 | 四川省机场集团有限公司成都天府国际机场分公司 | Cable insulation on-line monitoring method and device based on high-frequency signals |
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| CN104122465A (en) * | 2014-07-22 | 2014-10-29 | 西安交通大学 | Device and method for united aging of multi-group piece-shaped samples under voltage temperature gradient |
| CN104122465B (en) * | 2014-07-22 | 2017-01-11 | 西安交通大学 | Device and method for united aging of multi-group piece-shaped samples under voltage temperature gradient |
| CN104267322A (en) * | 2014-10-11 | 2015-01-07 | 南宁市第一中学 | Method for detecting aging of cable insulator |
| CN104267322B (en) * | 2014-10-11 | 2017-03-29 | 南宁市第一中学 | The aging method of detection cable insulation |
| CN104330711A (en) * | 2014-10-27 | 2015-02-04 | 华北电力大学 | Saturated reactor insulation accelerated aging test device and test method |
| CN104793111B (en) * | 2015-03-31 | 2017-11-07 | 华南理工大学 | Based on reason, change, the insulated cable residual life comprehensive estimation methods of electrical characteristics |
| CN104793111A (en) * | 2015-03-31 | 2015-07-22 | 华南理工大学 | Insulating cable residual service life comprehensive evaluation method based on physical, chemical and electric properties |
| 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 |
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| CN105259486A (en) * | 2015-11-17 | 2016-01-20 | 华中科技大学 | Aging site rapid diagnosis method for 10 kV XLPE cable based on polarization current measurement |
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| CN112557842A (en) * | 2020-11-24 | 2021-03-26 | 西南交通大学 | XLPE cable aging state evaluation method based on dielectric constant evaluation factor |
| CN112557842B (en) * | 2020-11-24 | 2021-09-21 | 西南交通大学 | XLPE cable aging state evaluation method based on dielectric constant evaluation factor |
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| CN116643132A (en) * | 2023-07-26 | 2023-08-25 | 四川省机场集团有限公司成都天府国际机场分公司 | Cable insulation on-line monitoring method and device based on high-frequency signals |
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Application publication date: 20131211 |