CN102998323A - Method for evaluating aging degree of crosslinked polyethylene cable based on nuclear magnetic resonance - Google Patents
Method for evaluating aging degree of crosslinked polyethylene cable based on nuclear magnetic resonance Download PDFInfo
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- CN102998323A CN102998323A CN2012105024770A CN201210502477A CN102998323A CN 102998323 A CN102998323 A CN 102998323A CN 2012105024770 A CN2012105024770 A CN 2012105024770A CN 201210502477 A CN201210502477 A CN 201210502477A CN 102998323 A CN102998323 A CN 102998323A
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Abstract
The invention relates to a method for evaluating aging degree of a crosslinked polyethylene cable based on nuclear magnetic resonance. The method comprises the following steps of: testing and comparing a molecular structure of the crosslinked polyethylene cable under different aging degrees through a nuclear magnetic resonance analyzer, and obtaining a proportional relation among the crosslinked polyethylene aging degrees, the temperature and the time, thus obtaining an aging state and residual service life of the crosslinked polyethylene cable to be evaluated according to the proportional relation. According to the method, the aging performance of an insulating material is detected from a micro perspective.
Description
Technical field
The present invention relates to a kind ofly come method that the twisted polyethylene cable degree of aging is assessed based on nuclear magnetic resonance principle, be specifically related to the relation of twisted polyethylene cable micro-property and its degree of aging.
Background technology
Crosslinked polyethylene (XLPE) cable is very important equipment in the electric power power transmission and transformation, it has the restrictive function of bottle-neck to electric load safety, stable transfer, be approximately 30 years the designed life of XLPE cable, the cable that more domestic Utilities Electric Co.s come into operation in early days is near tenure of use, cable is because construction lack of standardization and weather and artificial origin, cause cable running environment to worsen, for example, the filling of the accumulation of cable, ponding, mud, rubbish etc.Studies show that the variation of running environment in the cable tunnel, can cause the temperature of cable to raise, the degree of aging aggravation of cable.Except the life-span that affects cable self, also can cause the impact on operation of power networks stability.Because cable running environment is destroyed and cable overlapping, so that the heat dissipation channel of a lot of cables obtains destroying, thereby cable produces the faults such as local overheating easily when operation, comprising: local overheating, humidified insulation and mechanical damage aging and that construction lack of standardization causes.
Because running environment is abominable, the underground cable in a lot of cities is in order to ensure the safe operation of cable, and all in the low load condition operation, the utilization ratio of cable is low, and operating cost is high.In order to improve the economical and power supply reliability of cable operation, national grid has begun to carry out the assessment of assets life-cycle.Therefore under the prerequisite of the safe operation that guarantees cable, improve operational efficiency and the utilization factor of cable, the operating cost that reduces cable is the problem that Utilities Electric Co. needs solution at present badly.
The methods such as present thermal lifetime appraisal procedure such as conventional method, differential scanning calorimetry (DSC), Weibull distributed model method.But conventional method and Weibull distributed model method are just considered the change situation of a certain performance parameter of insulating material, with actual conditions certain difference are arranged.The DSC method can't be set up information that this method provides and the relation between the material function inefficacy theoretically.Particularly because twisted polyethylene cable is laid and the complicacy of running environment, in actual motion, can be subject to the impact of the factors such as electricity, heat, chemistry and water, cause it aging, at present mainly from macroscopic perspective, assess its running status and serviceable life according to the variation of a certain performance of crosslinked polyethylene, can not consider the impact that its aging action brings comprehensively, cause assessment result and actual conditions that certain difference is arranged.
Summary of the invention
The objective of the invention is to overcome according to a certain bulk parameter and assess the deficiency that the twisted polyethylene cable degree of aging exists, a kind of method of assessing the twisted polyethylene cable degree of aging according to the microcosmic molecular structure of insulating material is provided.When insulating material occured to wear out, its molecular structure or polymer sequence can change, thereby cause that material microstructure changes, molecular structure is as shown in Figure 1 under normal circumstances for it, because the chief component of crosslinked polyethylene is c h bond, when occuring to wear out, molecular structure will change.And nuclear magnetic resonance is as a kind of method of detection material micromechanism, can both distinguish preferably different structure sequence in the chemical composition of macromolecular material and the composition of the same race, provide a kind of and can characterize the crosslinked polyethylene aging conditions from microcosmic angle so the present invention is based on nuclear magnetic resonance principle, be convenient to assess the ageing state of twisted polyethylene cable.
The feature of nuclear magnetic resoance spectrum (such as width, shape and the area of spectral line) can characterize nuclear character and residing environment, and definite molecular structure.After sample carried out nuclear magnetic resonance spectroscopy and inverting, we can obtain the parameters such as chemical shift (relaxation time), peak area, can utilize them to determine the variation of molecular structure.Insulating material in ageing process because macromolecules degradation, deteriorated etc., the material molecule structure can change, at first by magnetic nuclear resonance analyzer test insulating material molecular structure situation under normal circumstances, and the molecular structure situation of test insulating material in ageing process, the relation of degree of aging and its micro-property of crosslinked polyethylene can be obtained, its degree of aging can be assessed more accurately.
The technical solution used in the present invention is that a kind of twisted polyethylene cable degree of aging appraisal procedure based on nuclear magnetic resonance may further comprise the steps:
1) utilize nuclear magnetic resonance to obtain the molecular structure of normal twisted polyethylene cable
Get the insulating layer material of normal twisted polyethylene cable, along the sampling of insulation course axial direction, and be cut into particle of uniform size, take by weighing 1.2 grams as normal specimens, utilize magnetic nuclear resonance analyzer that normal specimens is analyzed, obtain the peak area SP of normal twisted polyethylene cable
0And longitudinal relaxation time RTL
0The magnetic nuclear resonance analyzer parameter arranges as follows: centre frequency is 22MHz, and deviation frequency is 584.347825 KHz, and the pulse train repetition time is 2000us, and the repeated sampling number of times is 16.
2) normal twisted polyethylene cable is carried out aging test and sampling
Get normal twisted polyethylene cable, be cut into some sections stub cables, every section stub cable is grown 15～20 centimetres, utilize the air thermal aging oven under 90 ℃, 110 ℃ and 130 ℃ of three temperature, stub cable is carried out aging test, and sampling is 7 times under each temperature, and the time interval of every sub-sampling is the geometric ratio relation; Stub cable after the aging test is taken a sample along the insulation course axial direction respectively, and be cut into particle of uniform size, take by weighing 1.2 grams as aged samples.
3) aging twisted polyethylene cable characteristic quantity is carried out nuclear magnetic resonance spectroscopy
Utilize magnetic nuclear resonance analyzer to step 2) in each aged samples analyze, obtain the SP that concerns of the peak area of twisted polyethylene cable and aging temperature and digestion time
T, t, and longitudinal relaxation time and aging temperature and digestion time concern RTL
T, t, subscript T and t represent respectively aging temperature and digestion time.
4) get twisted polyethylene cable to be assessed, along the sampling of insulation course axial direction, and be cut into particle of uniform size, take by weighing 1.2 grams as testing sample, utilize magnetic nuclear resonance analyzer that testing sample is analyzed, obtain the peak area SP of twisted polyethylene cable to be assessed
ObjAnd longitudinal relaxation time RTL
Obj
5) peak area in step 3) and aging temperature and digestion time concerns SP
T, tAnd longitudinal relaxation time and aging temperature and digestion time concern RTL
T, tIn, find out the peak area SP with twisted polyethylene cable to be assessed
ObjAnd longitudinal relaxation time RTL
ObjHave cable aging temperature and digestion time under identical peak area and the longitudinal relaxation time, remember that respectively this aging temperature and digestion time are T
S, t
S
6) the aging temperature T that utilizes the air thermal aging oven to obtain in step 5)
SLower, normal twisted polyethylene cable is worn out, until insulation is not up to standard, it is t that the note cable is aged to the digestion time of insulation when not up to standard
Se
7) time that can also use under original load and running environment of twisted polyethylene cable to be assessed is:
In the formula:
The time that under original load and running environment, can also use for twisted polyethylene cable to be assessed;
The time of having used before detected for twisted polyethylene cable to be assessed.
The present invention is owing to the good effect that adopts said method to produce is very significant, namely compare the molecular structure of twisted polyethylene cable under different degree of agings by the magnetic nuclear resonance analyzer test, obtain the proportionate relationship between insulating material degree of aging and the temperature and time, realized ageing state and the residual life of assessment twisted polyethylene cable.
Description of drawings
Fig. 1 is the twisted polyethylene cable molecular structure;
Fig. 2 is nuclear magnetic resonance inverting spectrogram;
Sample peak area and thermal aging time graph of a relation when Fig. 3 is 90 ℃;
The graph of a relation of sample peak area and digestion time when Fig. 4 is 110 ℃;
The graph of a relation of sample peak area and digestion time when Fig. 5 is 130 ℃;
Fig. 6 be under the different temperatures peak area with respect to the variation amplitude figure of normal crosslinked polyethylene;
Fig. 7 is crest 1 longitudinal relaxation time and digestion time graph of a relation under the different temperatures;
Fig. 8 is crest 2 longitudinal relaxation times and digestion time graph of a relation under the different temperatures.
Embodiment
The inventive method is referring to following steps.
1) utilize nuclear magnetic resonance to obtain the molecular structure of normal twisted polyethylene cable
Get the insulating layer material (crosslinked polyethylene) of normal (newly dispatching from the factory) cable sample, along the sampling of insulation course axial direction, and be cut into particle of uniform size, take by weighing 1.2g as normal specimens.
Utilize magnetic nuclear resonance analyzer that normal specimens is analyzed, the magnetic nuclear resonance analyzer parameter arranges as follows: centre frequency (SF1) is 22MHz, deviation frequency (O1) is 584.347825 KHz, the pulse train repetition time (TR) is 2000us, repeated sampling number of times (NS) is 16, and accompanying drawing 2 is in this parameter the lower sample nuclear magnetic resonance inverting spectrogram that obtains to be set.
By nuclear magnetic resonance spectroscopy, obtain the peak area SP of normal twisted polyethylene cable
0And longitudinal relaxation time RTL
0, this peak area SP
0With RTL
0Foundation as the assessment of twisted polyethylene cable degree of aging.
2) normal twisted polyethylene cable is carried out aging test and sampling
According to the IEC6-811-1 standard, get normal (newly dispatching from the factory) twisted polyethylene cable, be cut into some sections stub cables, every section section stub cable length is 15～20 centimetres, utilize the air thermal aging oven under 90 ℃, 110 ℃ and 130 ℃ of three temperature grades stub cable to be carried out aging test, sampling is 7 times under each test temperature.
Under the different temperatures grade, raise 10 ℃ according to temperature, the sample life-span can reduce 1/2～1/3 digestion time of calculating under the different temperatures grade, and under the same temperature grade, the time interval of sample sampling should be the geometric ratio relation, is the geometric ratio relation between every section sample digestion time namely.Still take a sample along the insulation course axial direction for the some stub cable sampling methods after aging, and be cut into particle of uniform size, every sub-sampling 1.2g.For the sample sampling of different degree of agings three times, each nmr experiments sampling 3 times, the fully impact that brings of Elimination test error.
3) aging cable characteristic quantity is carried out nuclear magnetic resonance spectroscopy
Utilize magnetic nuclear resonance analyzer to step 2) in each aged samples analyze, obtain the SP that concerns of the peak area of twisted polyethylene cable and aging temperature and digestion time
T, t, shown in accompanying drawing 3～5, and longitudinal relaxation time and aging temperature and digestion time concern RTL
T, t, subscript T and t represent respectively aging temperature and digestion time, shown in accompanying drawing 7～8; For example adopt 90 ℃ of peak areas of aging 120 hours to be expressed as: SP
90,120
4) get twisted polyethylene cable to be assessed, along the sampling of insulation course axial direction, and be cut into particle of uniform size, take by weighing 1.2 grams as testing sample, utilize magnetic nuclear resonance analyzer that testing sample is analyzed, obtain the peak area SP of twisted polyethylene cable to be assessed
ObjAnd longitudinal relaxation time RTL
Obj
5) peak area in step 3) and aging temperature and digestion time concerns SP
T, tAnd longitudinal relaxation time and aging temperature and digestion time concern RTL
T, tIn, find out the peak area SP with twisted polyethylene cable to be assessed
ObjAnd longitudinal relaxation time RTL
ObjHave cable aging temperature and digestion time under identical peak area and the longitudinal relaxation time, remember that respectively this aging temperature and digestion time are T
S, t
S
6) adopt T
S, t
STwisted polyethylene cable to normal (newly dispatching from the factory) wears out, until insulation is not up to standard, it is t that the note cable is aged to the digestion time of insulation when not up to standard
Se
Therefore 7) can draw the time that twisted polyethylene cable to be assessed can also use under original load and running environment is:
In the formula:
The time that under original load and running environment, can also use for twisted polyethylene cable to be assessed;
The time of having used before detected for twisted polyethylene cable to be assessed.
Below the application process to technical scheme of the present invention is described further take the 110kV twisted polyethylene cable as example.
1) peak area that obtains normal cable is 6925.45
, the longitudinal relaxation time at peak 1 is 20.6663ms, the longitudinal relaxation time at peak 2 is 144.278ms.
2) under 90 ℃, 110 ℃, 130 ℃ according to the aging cable of IEC60811 standard, and obtain the curved line relation formula of peak area and the longitudinal relaxation time of each aged samples.
3) cable to be assessed (2 years is 17200h) is carried out nuclear magnetic resonance spectroscopy, obtaining its peak area is 5583.18
, the longitudinal relaxation time at peak 1 is 17.7387ms, the longitudinal relaxation time at peak 2 is 127.5420ms.
4) in the curve map that obtains, find temperature spot and the time point identical from cable peak area to be assessed and different peaks longitudinal relaxation time, be 130 ℃ herein, 240h.
5) obtain with a collection of cable that newly dispatches from the factory and under 130 ℃, wear out, to failure of insulation (it is the not up to standard to insulate) time be 2000h.
6) residual life that obtains this cable is 2000/240*17200-17200=14.40.
In order to further specify the feasibility of the method, according to the experimental formula of generally acknowledging in the world, namely cable is in certain operating temperature range simultaneously, and the most situation of the relational expression of life-span and temperature meets following experimental formula:
Wherein R is gas law constant, is 8.314, energy of activation
Be the characteristic quantity that characterizes the insulating material degree of aging, data are by experiment obtained
With obtain by IEC60811 standard breaking elongation experiment
Compare, carry out breaking elongation when experiment of cable insulation according to the IEC60811 standard, test specimen is to take from step 2 equally) in same batch sample, obtain energy of activation
Be 130.181kJ/mol, with the energy of activation that obtains by magnetic nuclear resonance method
128.35kJ/mol close, carry out again the cable insulation failure test, can solve variable a, the life formula that the life formula that namely obtains by nuclear magnetic resonance principle and IEC60811 standard obtain is close, and the method accuracy in assessment twisted polyethylene cable life-span is described.
The method of the assessment twisted polyethylene cable degree of aging based on nuclear magnetic resonance principle provided by the invention can be applicable in the high voltage insulating materials Aging Assessment, has realized from the detection of microcosmic angle to the insulating material ageing properties.Particularly fast-developing at the present extra-high voltage grid of China, and in the serious situation of high voltage insulating materials aging conditions, the present invention provides effective ways for the assessment insulating material.
Claims (2)
1. the twisted polyethylene cable degree of aging appraisal procedure based on nuclear magnetic resonance is characterized in that, may further comprise the steps:
1) utilize nuclear magnetic resonance to obtain the molecular structure of normal twisted polyethylene cable
Get the insulating layer material of normal twisted polyethylene cable, along the sampling of insulation course axial direction, and be cut into particle of uniform size, take by weighing 1.2 grams as normal specimens, utilize magnetic nuclear resonance analyzer that normal specimens is analyzed, obtain the peak area SP of normal twisted polyethylene cable
0And longitudinal relaxation time RTL
0
2) normal twisted polyethylene cable is carried out aging test and sampling
Get normal twisted polyethylene cable, be cut into some sections stub cables, every section stub cable is grown 15～20 centimetres, utilize the air thermal aging oven under 90 ℃, 110 ℃ and 130 ℃ of three temperature, stub cable is carried out aging test, and sampling is 7 times under each temperature, and the time interval of every sub-sampling is the geometric ratio relation; Stub cable after the aging test is taken a sample along the insulation course axial direction respectively, and be cut into particle of uniform size, take by weighing 1.2 grams as aged samples;
3) aging twisted polyethylene cable characteristic quantity is carried out nuclear magnetic resonance spectroscopy
Utilize magnetic nuclear resonance analyzer to step 2) in each aged samples analyze, obtain the SP that concerns of the peak area of twisted polyethylene cable and aging temperature and digestion time
T, t, and longitudinal relaxation time and aging temperature and digestion time concern RTL
T, t, subscript T and t represent respectively aging temperature and digestion time;
4) get twisted polyethylene cable to be assessed, along the sampling of insulation course axial direction, and be cut into particle of uniform size, take by weighing 1.2 grams as testing sample, utilize magnetic nuclear resonance analyzer that testing sample is analyzed, obtain the peak area SP of twisted polyethylene cable to be assessed
ObjAnd longitudinal relaxation time RTL
Obj;
5) peak area in step 3) and aging temperature and digestion time concerns SP
T, tAnd longitudinal relaxation time and aging temperature and digestion time concern RTL
T, tIn, find out the peak area SP with twisted polyethylene cable to be assessed
ObjAnd longitudinal relaxation time RTL
ObjHave cable aging temperature and digestion time under identical peak area and the longitudinal relaxation time, remember that respectively this aging temperature and digestion time are T
S, t
S
6) the aging temperature T that utilizes the air thermal aging oven to obtain in step 5)
SLower, normal twisted polyethylene cable is worn out, until insulation is not up to standard, it is t that the note cable is aged to the digestion time of insulation when not up to standard
Se
7) time that can also use under original load and running environment of twisted polyethylene cable to be assessed is:
In the formula:
The time that under original load and running environment, can also use for twisted polyethylene cable to be assessed;
The time of having used before detected for twisted polyethylene cable to be assessed.
2. described a kind of twisted polyethylene cable degree of aging appraisal procedure based on nuclear magnetic resonance according to claim 1, it is characterized in that: the magnetic nuclear resonance analyzer parameter arranges as follows: centre frequency is 22MHz, deviation frequency is 584.347825 KHz, the pulse train repetition time is 2000us, and the repeated sampling number of times is 16.
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Inventor after: Pan Xiubao Inventor after: Luo Hanwu Inventor after: Yang Fan Inventor after: Gao Bing Inventor after: Zhong Jie Inventor after: Guo Xingye Inventor after: Ran Wei Inventor before: Yang Fan Inventor before: Gao Bing Inventor before: Zhong Jie Inventor before: Guo Xingye Inventor before: Ran Wei |
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Effective date of registration: 20161123 Address after: The western part of Tongliao city the Inner Mongolia Autonomous Region 028000 Huolinhe Street No. 2080 Patentee after: STATE GRID EAST INNER MONGOLIA ELECTRIC POWER COMPANY LIMITED Patentee after: Chongqing University Address before: 400044 Shapingba District Sha Street, No. 174, Chongqing Patentee before: Chongqing University |