CN105842598A - Cross-linked polyethylene cable life detection method - Google Patents
Cross-linked polyethylene cable life detection method Download PDFInfo
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- CN105842598A CN105842598A CN201610427314.9A CN201610427314A CN105842598A CN 105842598 A CN105842598 A CN 105842598A CN 201610427314 A CN201610427314 A CN 201610427314A CN 105842598 A CN105842598 A CN 105842598A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
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Abstract
The invention provides a cross-linked polyethylene cable life detection method. The life of a cable is determined through testing. Test data temperature, illumination intensity, oxygen concentration and humidity information act as variables, and a neural network is trained. After a cable life prediction neural network is established, temperature, illumination intensity, oxygen concentration and humidity information of the environment in which the cable to be detected is laid is inputted, and the neural network calculates and gives the predicted life value of the cable so that the predicted service life and the residual life of the cable can be assessed and reference can be provided for replacement of the cable. The defects of the conventional cable life detection method are overcome, the structure of the cable is not damaged, error of the assessment result is low and the detection result is accurate. Reference is provided for laying and replacement of the cable, the complicated process of replacement of the cable is reduced, waste of materials can be reduced, cost can be saved, accident hidden trouble is less and fire and other disasters caused by the cable are less.
Description
Technical field
The present invention relates to cable detection technical field, more particularly, it relates to a kind of twisted polyethylene cable life-span is pre-
Survey method.
Background technology
The life-span of cable is detected and assesses, is that reasonable arrangement cable is changed, it is ensured that supply of electric power is safe and reliable
One important technical, is also the extremely important part realizing management effective to cable in intelligent grid.Along with electrically
Equipment is increasingly advanced, and the most generally, the usage amount of power cable also can get more and more.
In normal conditions of use, performance degenerates until losing its service behaviour and obtaining process and claim electric wire product lentamente
For " aging ".Cable senile cause is broadly divided into:
1) electrical ageing
Electrical ageing refer under electric field long term, due to the mass defect in cables manufacturing, construction machinery and external force
Effect injury, space in insulant, crackle etc., cause internal field uneven, induce shelf depreciation, with the variation of conductor
Portion, space, impurity are starting point, and local failure develops into poplar bundles, gradually causes insulation breakdown.Voltage ageing complicated mechanism,
It comprises because insulation breakdown produces.Discharge the series of physical and chemical effect caused.
The insulation breakdown mechanism of solid insulating material mainly has following two theoretical:
1. when reaching certain electric field, electron amount sharply increases so that insulating materials suffers electrical breakdown, due to electrical breakdown
Main cause is electronics, thus is referred to as " electrical breakdown ".
The most on insulator plus after voltage, have micro-electric current to pass through, this electric current the Joule heat produced causes material to hit
Wearing out bad, this is referred to as " thermal breakdown ".
) heat ageing
Heat ageing refers to the change of dielectric load current and short circuit current causes thermal expansion, material oxidation, thermal decomposition etc.
Aging and the insulating materials performance that chemical change and the physical change such as firmness change, be full of cracks cause reduces.Its chemical constitution exists
Change under the effect of heat so that the phenomenon of decreasing insulating.The essence of heat ageing is the insulating materials shadow at heat
Chemical change is there occurs, so heat ageing is also referred to as chemical aging under sound.Generally, the speed of chemical reaction is along with ring
The rising of border temperature and accelerate.Macromolecule organic material for insulation can issue heat degraded at the long term of heat, mainly
Being oxidation reaction, this reaction is also referred to as autoxidation free radical chain reaction, if the oxidation reaction of polyethylene is exactly from C mono-H
In key, the disengaging of H starts.
Heat ageing makes the electrically and mechanically performance of insulating materials produce deterioration simultaneously, and insulation life reduces, but the most aobvious
The change of the mechanical properties such as the performance write or the percentage elongation of material, hot strength.Such as, XLPE material is considered to work as extensibility
End-of-life when initial 400%--600% is reduced to 100%.
) mechanical aging
Mechanical aging is cable system producing, install, in running by the effect of various mechanical stresses occur aging.
This aging mainly insulating materials produces the defect of microcosmic under mechanical stress effect, and these small defects are over time
The continuous action of passage and mechanical stress slowly deteriorates, and forms minute crack and gradually expands, until causing shelf depreciation etc. to break
The phenomenon of bad insulation, this phenomenon also referred to as " an electric machinery punctures '.
) water is aging
Water immerses after cable (during manufacture or construction with run center tap leaching tide etc.), due to the folded effect of electric field, uneven at electric field
Even and electric field force centrostigma forms water tree.Generally there are interior water guide poplar bundles, butterfly water tree and outer water guide poplar bundles battle array.
When the after-applied voltage of immersion such as rubber, plastic cable makees long term test, compared with being not added with the situation that voltage only soaks
Low compared with dielectric characteristic.This phenomenon is referred to as " immersion class electrical phenomena ".To the edge material producing " immersion class electrical phenomena "
Carry out microexamination, be found to have the existence of the dendritic structure similar with electric branch, because this dendritic structure water is relevant, and
Being formed under low electric-field intensity, long duration of action, for distinguishing with electric branch, referred to as water tree water tree is at water-filled shape
Look like white under state, but be just difficult to observe after drying.Water tree common crystalline material such as polyethylene and crosslinking
Polyethylene, and few in the polymer such as the PVC of amorphous material, butyl rubber find.Additionally, water tree is at the work of DC voltage
With lower life of relatively having difficult labour, but being relatively easily generated under alternating voltage effect, voltage also can promote the generation of water tree frequently.
The factor that cable is aging relates generally to the aspects such as electricity, heat, machinery and environment.
Power cable test technology seriously lags behind power cable manufacture and application technology.Country is about insulated power cable
(XLPE) test method, standard and the operating standard after putting into operation is promulgated at 20 century 70s mostly, and relatively outmoded backwardness, has
Even continue to use the test method of paper oil insulation power cable.DC break down voltage test is usually used in the preventative of oil medium electrical equipment
Diagnostic test, before phase early 1990s, the most generally continues to use the test method of paper oil insulation cable, often takes off-line
DC break down voltage destructive testing is as insulated power cable completion commissioning test and the only resource of periodicity preventive trial.
DC break down voltage test be usually used in oil medium electrical equipment prediction diagnosis test, phase early 1990s it
Before, the most generally continue to use the test method of paper oil insulation cable, often take the pressure destructive testing of offline DC as insulation
The only resource of power cable completion commissioning test and periodically preventive trial.Theoretical analysis and calculation, experimental study and long-term
A large amount of practical operating experiences of accumulation show: on the one hand, owing to DC break down voltage process of the test is to inject greatly to cable insulation medium
The space charge process of amount, space charge is limited to the good insulating properties of medium and can not leak in time.These remaining void electricity
The internal field that lotus accumulation is formed and outer construction frequency superposition of electricity field, distorting medium internal electric field is distributed, major injury cable insulation,
The power cable often making pass the test just occurs cable insulation to puncture event after putting into operation in several hours or tens hours
, even there is multiple spot breakdown fault in barrier.On the other hand, the voltage value of DC break down voltage test is the highest, and test period is longer, direct current
Electric field promotes the water tree in medium to change to electric branch, and the test of periodic DC break down voltage causes cable insulation in early days beyond doubt
Deterioration, shortens the cable running safety life-span relatively.According to statistics: between 1962-1999, fortune is put into after DC break down voltage pass the test
The number of times that the cable of row breaks down in a short time accounts for cable operation fault total degree.The fact that again illustrate direct current
Pressure test not only can not find cable operational defect in time, and the insulation harm making power cable on the contrary is relatively big, shortens cable
Service life.Up to the present, many countries, including China, the most no longer use DC break down voltage to test as crosslinked polyethylene
The preventive trial means of insulated power cable.
Crosslinked polyethylene electric wire is used to obtain the macromolecular material such as rubber, plastics, promotes aging that factor mainly has:
Oxygen must exist, and works under heating condition, and by solar radiation, the effect of ozone, and under low temperature, bending is moved, worn away, material
The cracking of material or polymerization, the migration of material component and volatilization, it is subject to erosion of oil or solvent etc..In these factors, heat with oxygen is
The principal element of material aging, thermo-oxidative ageing, by generally betiding in various use environment, the most in an atmosphere, is therefore studied
It is particularly important with the thermo-oxidative ageing of examination product.The macromolecular material such as rubber, plastics can absorb the external world oxygen, and
This internal diffusion, oxygen atom can with rubber, resin chemically reactive (oxidation) and cause crosslinking so that making material forfeiture excellent
Elasticity, flexibility make mechanical performance progressively degenerate, the most also cause the forfeiture of electric property.Part in rubber-plastics material is joined
Mixture (such as plasticizer) is oxidized, and it is volatilizable that oxidation product has, and having of having can promote ageing process, and product is in hot state
Work, because temperature is the highest, the molecular thermalmotion of material will be greatly increased, simultaneously because the effect of heat, the cracking of material, component
Migration or volatilization the most necessarily aggravate, these phenomenons are referred to as " heat ageing ".The heat of the rubber-plastics material that therefore product is used is old
Change with the quality of material, Recipe have the biggest relation, as the heat ageing of rubber except having with rubber clone outside the Pass, also depend on
In preventing aging system and vulcanizing system.The intermediate product that addition age resistor can make oxidation generate is passivated and postpones oxidation, but anti-old
Agent itself the most also can volatilize, consume so that ineffective.The heat aging performance of polyvinyl chloride plastic is main and steady
Determine system relevant.
For power and illuminating line, the India-rubber cable of employing in use, due to the oxidation of rubber
Decomposition, makes the electric physical and mechanical property of vulcanized rubber change: hardening, become fragile, and forms crackle, air on rubber
It is filled in crackle with moisture and makes the aging aggravation of cable, ultimately result in insulation breakdown or short circuit.Additionally, cable uses bad environments
Accelerate the aging of cable insulation layer material.So cable failure be there is no suitable standard, and cable life is lacked effectively
Research and method of estimation, thus the replacing to cable bears the character of much blindness with regard to band, and change cable operation loaded down with trivial details and
Being the operation that a price is much more expensive and heavy, its result necessarily causes the waste of material or brings the hidden danger of accident.So,
It is not only important from the viewpoint of collateral security power equipment functional reliability to definitely evaluating of a cable life, and from advance
Also it is critically important from the perspective of fire-proof.
Patent document CN 104089838 A discloses a kind of cable insulation life-span method for quick based on hardness,
By the data of cable insulation hardness under different temperatures during acquisition senile experiment and time point, set up described in correspondence many
Plant the Ageing Model of different cables；Analyze the hardness of cable insulation to be detected and use temperature, bringing described aging mould into
Type, obtains the service life of cable insulation to be detected.But mainly use temperature and hardness to set up Ageing Model to evaluate electricity
The life-span of cable, not comprehensively so as to get cable life the most accurate.
Patent document CN 103605054 A discloses the degradation detecting method of a kind of twisted polyethylene cable, the present invention
Relating to a kind of 10kV twisted polyethylene cable water tree ageing management system, this system includes: 10kV crosslinked polyethylene is to be measured
Cable, described 10kV crosslinked polyethylene cable under test external insulation ground connection, cable core is with switch module input S0 even
Connecing, switch module output is divided into S1, S2, S3 and S4 tetra-end, is connected DC power source unit, S2 end between S1 end and ground
It is directly grounded, between S3 end and ground, is connected repetition pulse unit, be connected between S4 end and ground by ac square wave unit string
Connecing the circuit of detection resistance R, connect microcurrent at detection resistance R two ends, microcurrent passes through universal serial bus and computer
Connect.The present invention can make measurement more thoroughly by being transformed into leakage current by the repetitive frequency pulsed pre-detrapping electric charge induced
Result reflects water tree degree of aging more really.But the mainly detection of high-voltage cross-linking polythene cable, hands over for low pressure
Connection PE cable aging and life tests without reference to.
Its aging speed of different twisted polyethylene cables and life-span are different, use, its longevity in different environment
Life also can be very different, it is therefore desirable to a kind of effective twisted polyethylene cable life detecting method, exists assessing cable
Life expectancy in practical service environment, changes cable and the laying of cable for the later stage and line equipment transformation provides reference.
Summary of the invention
In view of this, the invention provides a kind of twisted polyethylene cable life detecting method, use impact to cross-link poly-second
Temperature, intensity of illumination, oxygen concentration and the humidity information that alkene cable is aging, as variable, is trained neutral net, is established cable
After life prediction neutral net, the input temperature of cable under test environment, intensity of illumination, oxygen concentration and humidity information, nerve net
Network calculates the life prediction value providing cable, makes assessment with the life expectancy to cable, and changing for cable provides reference.This
Bright technical scheme is as follows:
A kind of twisted polyethylene cable life detecting method, it is characterised in that including: set up pilot system, test cross-links poly-second
In the life-span of alkene cable, shown pilot system organizes the value of temperature, intensity of illumination, oxygen concentration and humidity by setting more, and test is many
The life-span of twisted polyethylene cable under the conditions of group different tests；Temperature, intensity of illumination, oxygen concentration and humid test letter will be organized more
Breath, as independent variable, utilizes described independent variable composing training sample；
Set up three layers of BP neutral net, utilize described training sample to be trained, the BP neutral net set up by described training
Sample is input to three layers of BP neutral net, is calculated cable life value；Cable life value will be obtained by neural computing
The cable life value contrast measured with experiment, adjusts weights and the threshold value of three layers of BP neutral net, until calculated value is surveyed with experiment
The difference of value is sufficiently small or be zero, so that it is determined that the weights of three layers of BP neutral net and threshold value；
Choosing the use ambient parameter of cable under test, be input in the BP neutral net trained, neutral net is given cable
Predicting the outcome of life-span.
Further, judged the insulating properties of cable by the dielectric loss angle of power frequency method test cable, and then determine
The longevity of cable.
Further, three layers of BP neutral net include input layer, intermediate layer and output layer.
Further, the test data value of 100-200 group cable is chosen as training sample.
Further, by dielectric loss measuring instrument, the cable in chamber is carried out dielectric loss angle test；Dielectric loss measuring instrument
Operating frequency range is 0.0001Hz-1KHz.
Further, cable sample length to be tested is not less than 3m.
The invention has the beneficial effects as follows: use neural network cable life forecast model, a kind of crosslinked polyethylene electricity
Cable life detecting method, uses and affects the aging temperature of twisted polyethylene cable, intensity of illumination, oxygen concentration and humidity information work
For variable, train neutral net, after establishing cable life prediction neural network, input the temperature of cable under test environment, illumination
Intensity, oxygen concentration and humidity information, neural computing provides the life prediction value of cable, does with the life expectancy to cable
Going out assessment, changing for cable provides reference, overcomes the deficiency of traditional cable life detecting method, will not destroy the knot of cable
Structure, assessment result deviation is little, and testing result is accurate.Replacing to cable provides reference, reduces the cumbersome process changing cable, energy
Enough reduce the disasters such as the waste of material, cost-effective, less accident potential, the less fire occurred because of cable.
Accompanying drawing explanation
Fig. 1 is that embodiment of the present invention dielectric loss measuring instrument tests structural representation.
Fig. 2 is the flow chart of embodiment of the present invention cable life prediction.
Detailed description of the invention
Describe the present invention the most by way of example in detail.
Artificial neural network (Artificial Neural Networks) is also referred to as neutral net (NNs) or referred to as connects
Connect model (Connection Model), refer to construct during biology learns in the field such as information and computer science
Neutral net.It is a kind of imitation human brain neural network's behavioural characteristic, a large amount of neurons extensively interconnect and become a kind of multiple
Miscellaneous network system, carries out the algorithm mathematics model of distributed parallel information processing.This network relies on the complexity of system, logical
Cross interconnective relation between the internal great deal of nodes of adjustment, thus reach the purpose of process information.The present invention proposes one
Cable life Forecasting Methodology based on neutral net, uses and affects the aging temperature of twisted polyethylene cable, intensity of illumination, oxygen
Concentration and humidity information, as variable, train neutral net, after establishing cable life prediction neural network, input cable under test
The temperature of environment, intensity of illumination, oxygen concentration and humidity information, neural computing provides the life prediction value of cable, with right
The life expectancy of cable makes assessment.
The idiographic flow of crosslinked polyethylene life detecting method of the present invention is as shown in Figure 2.
S1: by accelerated aging test, utilize the life-span of industrial frequency experiment method detection cable.Accelerated aging test, by carrying
The temperature of high experimental condition, tests out the life value of cable.
The present invention is tested the state of tested cable by power frequency method.Power frequency method principle is as it is shown in figure 1, dielectric loss angle, statistical analysis shows that tan δ is more than 1% expression defective insulation.The present invention uses and is situated between
Damage tester and measure the dielectric loss angle of cable.Cable is put in chamber, use set temperature, intensity of illumination, oxygen
Gas concentration and humidity data, by improving temperature, be accelerated degradation to cable.Because under normal conditions, cable
Life-span is generally 20-30, so natural ageing test test is unrealistic, by improving temperature employing accelerated ageing in the present invention
Test method, records the life value of cable.When accelerated aging test, the medium using dielectric loss measuring instrument to measure cable in real time damages
Consumption angle, when dielectric loss angle tan δ is more than 1%, writes down experimental period, is the life value of cable.Cable to same size, surveys
Cable experimental lifetime value under the conditions of examination multi-group data, preferably 100-200 group data.
100-200 group temperature, intensity of illumination, oxygen concentration and the humidity value of the experiment of S2, power taking cable are as independent variable.
S3, using the independent variable in S2 as training sample, set up three layers of BP neutral net, choose 150 groups of data as instruction
Practice sample the BP neutral net set up is trained.In the present embodiment, preferably 150 groups cable testing supplemental characteristics are to three layers of BP
Neutral net is trained.There is certain deviation in cable testing parameter value and actually applied numerical value on cable, chooses
Data are very few, there is certain randomness, and the neutral net error that so training obtains will be bigger, the mistake to life prediction
Difference also can be the biggest；The ambient parameter data group chosen too much can introduce unnecessary data deviation, because have chosen too much data,
Occur that the probability of the biggest data point of deviation will improve, easily cause the deviation of training neutral net, and choose too much data,
Workload can be increased.Prove through test of many times, use the supplemental characteristic training of 100-200 group to obtain neutral net error relatively.
Less initial value is composed to intermediate layer weights and threshold value.Training sample is input to three layers of BP neutral net, is calculated cable
Life value；Cable life value will be obtained by neural computing and measure the life value contrast obtained with experiment, according to calculating
The difference adjustment intermediate layer weights of value and actual value and the size of threshold value, repetition training step, until calculated value and actual value
Differ sufficiently small or be zero, so that it is determined that the intermediate layer weights of three layers of BP neutral net and threshold value；Obtain the three layers of BP trained
Artificial neural network.
S4, temperature, intensity of illumination, oxygen concentration and the humidity number chosen in the cable practical service environment in life-span to be detected
According to, it being input in the three layers of BP neutral net trained, neural computing is given and predicts the outcome cable life.
After three layers of BP neural computing go out the bimetry of cable, it was predicted that the life-span is the whole service life of cable, subtracts
Go the time used, i.e. can obtain the residual life reference value of this cable under test, it was predicted that residual life reference can be provided,
There is provided reference for changing cable and relevant device, it is to avoid the waste of cable, it is possible to effectively economize on resources, also save people simultaneously
Power cost.
The invention provides the life detecting method of a kind of twisted polyethylene cable, by the life-span of test determination cable,
Using test data temperature, intensity of illumination, oxygen concentration and humidity information as variable, train neutral net, establish the cable longevity
After life prediction neural network, input cable under test will lay the temperature in environment, intensity of illumination, oxygen concentration and humidity letter
Breath, neural computing provides the life prediction value of cable, and with the expected service life to cable, residual life makes assessment,
Change for cable and reference is provided.Use neural network cable life forecast model, by experimental test cable temperature, illumination
Intensity, oxygen concentration and four kinds of parameters of humidity information evaluate the service life of cable, overcome traditional cable life tests side
The deficiency of method, will not destroy the structure of cable, and assessment result deviation is little, and testing result is accurate.Laying and replacing to cable carry
For reference, reduce change cable cumbersome process, it is possible to reduce material waste, cost-effective, less accident potential, less because of
The disasters such as the fire occurred for cable.
Finally illustrating, above example is only in order to illustrate technical scheme and unrestricted, and this area is common
Other amendment or equivalents that technical scheme is made by technical staff, without departing from technical solution of the present invention
Spirit and scope, all should contain in the middle of scope of the presently claimed invention.
Claims (7)
1. a twisted polyethylene cable life detecting method, it is characterised in that including: use accelerated aging test test crosslinking
In the life-span of PE cable, shown test organizes the value of temperature, intensity of illumination, oxygen concentration and humidity by setting more, and test is many
The life-span of twisted polyethylene cable under the conditions of group different tests；Temperature, intensity of illumination, oxygen concentration and humid test letter will be organized more
Breath, as independent variable, utilizes described independent variable composing training sample；
Set up three layers of BP neutral net, utilize described training sample to be trained, the BP neutral net set up by described training
Sample is input to three layers of BP neutral net, is calculated cable life value；Cable life value will be obtained by neural computing
The cable life value contrast measured with experiment, adjusts weights and the threshold value of three layers of BP neutral net, until calculated value is surveyed with experiment
The difference of value is sufficiently small or be zero, so that it is determined that the weights of three layers of BP neutral net and threshold value；
That chooses cable under test uses the temperature of environment, intensity of illumination, oxygen concentration and humidity parameter, is input to the BP trained
In neutral net, neutral net is given and predicts the outcome the twisted polyethylene cable life-span.
Detection method the most according to claim 1, it is characterised in that by the longevity of power frequency method test twisted polyethylene cable
Life.
Detection method the most according to claim 2, it is characterised in that described power frequency method includes utilizing dielectric loss measuring instrument to test
The dielectric loss angle of cable.
Detection method the most according to claim 3, it is characterised in that described dielectric loss measuring instrument operating frequency range is
0.0001Hz-1KHz。
Detection method the most according to claim 4, it is characterised in that cable sample length to be tested is not less than 3m.
Detection method the most according to claim 1, it is characterised in that described three layers of BP neutral net include input layer, in
Interbed and output layer.
Detection method the most according to claim 6, it is characterised in that the test data value choosing 100-200 group cable is made
For training sample.
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| CN111025090A (en) * | 2019-11-19 | 2020-04-17 | 云南电网有限责任公司临沧供电局 | Cable life prediction method based on leakage current difference coefficient |
| CN112557847A (en) * | 2020-11-30 | 2021-03-26 | 国网辽宁省电力有限公司电力科学研究院 | Polypropylene cable composite aging test device and method |
| 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 |
| 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 |
| CN113678004A (en) * | 2019-03-28 | 2021-11-19 | 纬湃科技有限责任公司 | Method and apparatus for estimating aging of electronic components |
| CN114325182A (en) * | 2021-12-17 | 2022-04-12 | 西南交通大学 | Evaluation method for thermal-oxidative aging degree of 10kVXLPE cable based on temperature-electricity change rate |
| CN117420006A (en) * | 2023-10-18 | 2024-01-19 | 句容市家天下网络科技有限公司 | Cable breakage evaluation system using neural network |
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| CN117420006A (en) * | 2023-10-18 | 2024-01-19 | 句容市家天下网络科技有限公司 | Cable breakage evaluation system using neural network |
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