CN111157854A - Method and device for processing residual life of cable, storage medium and processor - Google Patents
Method and device for processing residual life of cable, storage medium and processor Download PDFInfo
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- CN111157854A CN111157854A CN201911419973.8A CN201911419973A CN111157854A CN 111157854 A CN111157854 A CN 111157854A CN 201911419973 A CN201911419973 A CN 201911419973A CN 111157854 A CN111157854 A CN 111157854A
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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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- 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
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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
- G01R31/20—Preparation of articles or specimens to facilitate testing
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Abstract
The invention discloses a method and a device for processing the residual life of a cable, a storage medium and a processor. Wherein, the method comprises the following steps: evaluating the cable based on a preset evaluation model to obtain the insulation state and the residual life of the cable; and carrying out weighted average calculation on the insulation state and the residual life according to a preset weight to obtain the final residual life of the cable, wherein the preset weight is a numerical value determined according to field data of cable operation. The invention solves the technical problem that the residual service life of the cable cannot be accurately evaluated in the prior art.
Description
Technical Field
The invention relates to the field of cable life prediction, in particular to a method and a device for processing the residual life of a cable, a storage medium and a processor.
Background
Crosslinked polyethylene is widely used in the power cable industry. Due to the fact that the cable runs under the factors of heat, electricity, machinery and the like for a long time, various defects exist inside the cable insulation material or outside the cable inevitably, the cable insulation is aged or fails, and normal operation of a power system is threatened seriously. The design life of the cable is 30 to 40 years, and since crosslinked cables were put into use since the eighties of the last century, the operating time of a large number of active cables was close to the design life. Therefore, in order to ensure the normal operation of the power system and reduce the accident rate, the research on the aging state and the residual life prediction of the cable is very important for the future planning and the safety maintenance of the power grid.
At present, methods for evaluating the residual life of the cable are also many, such as partial discharge test, space charge method, differential scanning calorimetry, dielectric constant method, and lifetime index method based on breakdown, and cover a plurality of characterization means such as physical, chemical, and electrical. However, most of the existing methods are limited to using a single evaluation means or model as an evaluation standard for the remaining life of the active cable, so that the accuracy of the evaluation result is problematic, and a powerful judgment basis cannot be provided for the normal maintenance and state evaluation of the power grid system cable.
The existing cable aging evaluation method has the following defects:
(1) the evaluation means is single, the residual aging life of the cable is usually given based on only a single factor or an evaluation method, and the result is not representative and objective;
(2) the existing cable life evaluation method based on aging factors can only give the approximate insulation state of the cable, and cannot give a specific life range;
(3) in the existing method, most evaluation models are artificial aging experiments based on new cables, and the residual aging life of the active cables is deduced by comparing with actual aging data, however, the artificial aging conditions are far from the actual operating environment, whether the aging mechanism is consistent or not is uncertain, and the result may have larger deviation.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a method and a device for processing the residual life of a cable, a storage medium and a processor, which are used for at least solving the technical problem that the residual life of the cable cannot be accurately evaluated in the prior art.
According to an aspect of the embodiments of the present invention, there is provided a method for processing a remaining life of a cable, including: evaluating the cable based on a preset evaluation model to obtain the insulation state and the residual life of the cable; and carrying out weighted average calculation on the insulation state and the residual life according to a preset weight to obtain the final residual life of the cable, wherein the preset weight is a numerical value determined according to field data of the operation of the cable.
Optionally, evaluating the cable based on a predetermined evaluation model, and obtaining the insulation state and the remaining life of the cable includes: determining the insulation state of the cable according to an aging factor evaluation model; determining the remaining life of the cable according to a thermal life evaluation model and/or a breakdown characteristic evaluation model.
Optionally, determining the insulation state of the cable according to the aging factor evaluation model includes: obtaining the test current of the cable by using an isothermal relaxation current method; fitting a current curve generated by the test current, and calculating an aging factor; and determining the insulation state according to the aging factor.
Optionally, fitting a current curve generated by the test current, and calculating an aging factor by the following method: fitting by using a third-order exponential decay model to obtain fitting parameters; obtaining a first parameter and a second parameter based on the fitting parameters, wherein the first parameter is a parameter for representing the insulation internal crystal and amorphous interface, and the second parameter is a parameter of polarization caused by insulation aging; and obtaining the aging factor according to the ratio of the first parameter to the second parameter.
Optionally, determining the remaining life of the cable according to the thermal life evaluation model and/or the breakdown characteristic evaluation model comprises: calculating the thermal life at a predetermined operating temperature by
Wherein, TSIs the operating temperature, T, of the conductortB is a constant associated with activation energy for thermal exposure temperature; and/or calculating the remaining life of the cable at a predetermined voltage by
Wherein i is the number of pressurization stages; u shapeiTo apply a voltage; t is tiIs UiDuration of action.
According to another aspect of the embodiments of the present invention, there is also provided a device for processing the remaining life of a cable, including: the evaluation module is used for evaluating the cable based on a preset evaluation model to obtain the insulation state and the residual life of the cable; and the calculation module is used for carrying out weighted average calculation on the insulation state and the residual life according to a preset weight to obtain the final residual life of the cable, wherein the preset weight is a numerical value determined according to field data of cable operation.
Optionally, the evaluation module comprises: a first determination unit for determining an insulation state of the cable according to an aging factor evaluation model; a second determining unit for determining the remaining life of the cable according to the thermal life evaluation model and/or the breakdown characteristic evaluation model.
Optionally, the first determining unit includes: the obtaining subunit is used for obtaining the test current of the cable by using an isothermal relaxation current method; the calculation subunit is used for fitting a current curve generated by the test current and calculating an aging factor; and the determining subunit is used for determining the insulation state according to the aging factor.
According to another aspect of the embodiments of the present invention, there is also provided a storage medium, where the storage medium includes a stored program, and when the program runs, a device in which the storage medium is located is controlled to execute the processing method for the remaining life of the cable described in any one of the above.
According to another aspect of the embodiments of the present invention, there is also provided a processor, configured to execute a program, where the program executes a method for processing the remaining life of the cable according to any one of the above methods.
In the embodiment of the invention, the cable is evaluated based on a preset evaluation model to obtain the insulation state and the residual life of the cable; and performing weighted average calculation on the insulation state and the residual life according to a preset weight to obtain the final residual life of the cable, wherein the preset weight is a numerical value determined according to field data of cable operation, and the insulation state and the residual life obtained by a preset evaluation model are subjected to weighted average calculation to obtain the final residual life of the cable, so that the aim of accurately predicting the final residual life of the cable is fulfilled, thereby effectively ensuring the normal maintenance and overhaul of the cable in the power system, ensuring the safe and reliable operation of the power system, and further solving the technical problem that the residual life of the cable cannot be accurately evaluated in the prior art.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a food flow diagram of a method for managing remaining cable life according to an embodiment of the present invention;
fig. 2 is a schematic view of a cable remaining life processing apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
In accordance with an embodiment of the present invention, there is provided an embodiment of a method for processing remaining life of a cable, it is noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions and that, although a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than that described herein.
Fig. 1 is a food flow chart of a method for processing the remaining life of a cable according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:
step S102, evaluating the cable based on a preset evaluation model to obtain the insulation state and the residual life of the cable;
and step S104, carrying out weighted average calculation on the insulation state and the residual life according to a preset weight to obtain the final residual life of the cable, wherein the preset weight is a numerical value determined according to field data of cable operation.
Through the steps, the cable can be evaluated based on a preset evaluation model to obtain the insulation state and the residual life of the cable; the insulation state and the residual life are subjected to weighted average calculation according to the preset weight to obtain the final residual life of the cable, wherein the preset weight is a numerical value determined according to field data of cable operation, the insulation state and the residual life are obtained through a preset evaluation model, the final residual life of the cable is further obtained, and the purpose of accurately predicting the final residual life of the cable is achieved, so that the technical effects of effectively guaranteeing normal maintenance and overhaul of the cable in a power system, ensuring safe and reliable operation of the power system are achieved, and the technical problem that the residual life of the cable cannot be accurately evaluated in the prior art is solved.
As an optional embodiment, an aging factor evaluation method, a thermal life evaluation method and a breakdown characteristic evaluation method can be adopted to make more reliable evaluation on the residual life of the cable, so that the normal maintenance and overhaul of the cable in a power system are ensured, and the operation safety of a power grid is improved. The aging factor evaluation method comprises the steps of cable overall relaxation current testing, aging factor calculation and evaluation model establishment. Thermal lifetime method involves TGA (thermogravimetric analysis) test to find the activation energy of chemical reaction; the thermal life at high temperature is obtained through an accelerated thermal aging experiment, and the thermal life at working temperature is deduced through a point-slope method. The breakdown characteristic evaluation method is to give the residual life of the cable on the basis of Weibull distribution according to an electric aging inverse power function life model. According to the final results of the three methods, the most reliable residual service life can be obtained by adopting a weighted average method, and the safe and reliable operation of the power system is ensured.
Optionally, the cable is evaluated based on a predetermined evaluation model, and obtaining the insulation state and the remaining life of the cable includes: determining the insulation state of the cable according to the aging factor evaluation model; the remaining life of the cable is determined according to the thermal life evaluation model and/or the breakdown characteristic evaluation model.
As an alternative embodiment, in the process of making the final judgment on the remaining life of the cable, the overall insulation state of the cable is firstly preliminarily known according to the life evaluation model based on the aging factor, and meanwhile, the reliable remaining life is preferably selected by adopting a weighted average method through the remaining life values of the cable in the evaluation model based on the thermal life and the breakdown characteristic evaluation model and combining with field data of cable operation.
It should be noted that, the parameters involved in the above implementation process cover characteristic parameters of various aspects of physics, chemistry and electricity, and the aging state of the cable is evaluated comprehensively; the reliability of the evaluation model and the prediction result is improved, the normal maintenance of the operation cable is facilitated, and the accident rate is reduced. The evaluation test means comprises main factors such as electricity, heat, machinery and the like which influence the cable aging, and the objectivity and the accuracy of an evaluation result are ensured.
Optionally, determining the insulation state of the cable according to the aging factor evaluation model comprises: obtaining the test current of the cable by using an isothermal relaxation current method; fitting a current curve generated by the test current, and calculating an aging factor; based on the aging factor, the insulation state is determined.
As an alternative embodiment, the aging factor method comprises the steps of carrying out an isothermal relaxation current method test on the cable, fitting a matlab to a current curve, calculating an aging factor, and analyzing the insulation state of the aging factor. In the aging factor evaluation model, the polarization time can be properly adjusted according to the sample during the relaxation current test. Therefore, the evaluation method based on the aging factor can integrally judge the macroscopic insulation state of the cable sample, and has simple experimental test principle and simple and convenient operation; the two main factors of the activation energy and the elongation at break for evaluating the insulation state are combined in the thermal aging life evaluation model, so that the reliability of the model is ensured; through multiple considerations such as electricity, heat, chemistry, etc., the evaluation system can give more accurate and reliable remaining life results.
Optionally, fitting a current curve generated by the test current, and calculating the aging factor in the following manner: fitting by using a third-order exponential decay model to obtain fitting parameters; obtaining a first parameter and a second parameter based on the fitting parameters, wherein the first parameter is a parameter for representing the insulation internal crystal and amorphous interface, and the second parameter is a parameter of polarization caused by insulation aging; and obtaining the aging factor according to the ratio of the first parameter and the second parameter.
As an alternative embodiment, the isothermal relaxation current test first pretreats the cable: and stripping the outer shielding layers at two ends of the cable, and cleaning the stripped part by using absolute ethyl alcohol, so that the surface leakage current in the measurement process is reduced as much as possible. One end of the cable is reliably insulated, the other end of the cable is connected with a high-voltage direct-current power supply for polarization, the conductor is connected with the anode, the outer metal shield is grounded, and the polarization time is 1800 s. Fitting the matlab to the current curve and calculating the aging factor according to a 3-order exponential decay model, wherein the formula is as follows:
wherein, ai、τiThe trap density and the trap depth of the cable insulation can be respectively reflected in relation to the dielectric property of the cable insulation; i is0The steady state value at which the depolarizing current reaches relative equilibrium is obtained. The 3 rd order exponential decay model can reflect three polarization processes of the cable insulation, wherein a1、τ1Mainly characterized by the interface formed by the semi-conductive layer of the cable and XLPEA bulk polarization process; a is2、τ2Polarization process corresponding to amorphous state and crystal interface in cable insulation; a is3、τ3The interface polarization process which is caused by corresponding aging and comprises the formation of defects of metal salt, hydrated ions, conductive carbon black and the like.
Then through aiAnd τiThe coefficient represents the aging factor A of the cable insulation state, and the formula is as follows:
wherein, ai、τiCorresponding to the parameters fitted by the third-order exponential model; q2(τ2) Represents a parameter of interest between the crystalline and amorphous interfaces of the insulating interior, the parameter of interest being substantially unchanged during ageing; q3(τ3) It represents the relevant parameter of the various polarizations resulting from the ageing undergone by the insulation, which becomes greater as the degree of ageing increases.
The method comprises the steps of establishing an aging factor database with different operation ages by carrying out current test and aging factor calculation on a large number of cable samples so as to obtain a database about the aging factor and the operation ages of cables, wherein the cables with different operation ages should contain new cables which are not put into use. And a more powerful analysis basis can be provided for the subsequent evaluation of the cable insulation state through the establishment of the database.
The cable is a high voltage cable, which is not limited to a crosslinked polyethylene insulated cable, but is not limited to a specific voltage class.
The above analysis of the state of the aging factor is to obtain the insulation state by following the calculation result of the aging factor through the existing evaluation standard.
Optionally, determining the remaining life of the cable according to the thermal life evaluation model and/or the breakdown characteristic evaluation model comprises: calculating the thermal life at a predetermined operating temperature by
Wherein the content of the first and second substances,TSis the operating temperature, T, of the conductortB is a constant associated with activation energy for thermal exposure temperature; and/or calculating the remaining life of the cable at a predetermined voltage by
Wherein i is the number of pressurization stages; u shapeiTo apply a voltage; t is tiIs UiDuration of action.
As an optional embodiment, the thermal life method is to perform a thermal aging test at a high temperature point for a certain cable material, and then obtain the end-of-life time of the insulating material at the aging temperature through a thermal weight loss comparative analysis at a first stage of inert gas, and obtain the service life of the material at the working temperature through an activation energy method, an accelerated aging test and a life calculation formula. The method has the advantages of short time consumption, simple operation, less workload and the like.
The activation energy method is to perform thermogravimetric analysis on four samples at four heating rates (such as 5 ℃/min, 10 ℃/min, 15 ℃/min and 20 ℃/min) in an air atmosphere, wherein the test temperature ranges from 50 ℃ to 800 ℃.
The activation energy is solved by carrying out chemical reaction kinetic analysis on four thermal weight loss curves measured at four heating rates, and the method can avoid the reaction mechanism. Specifically, the activation energy is solved by adopting an Ozawa method, and the method is based on an equation:
wherein E represents reaction activation energy, α represents the rate of thermal decomposition of a sample, β is temperature rise rate, R represents gas constant, A represents collision coefficient, and T represents absolute temperature, lg β -1/T relation is drawn, activation energy E is obtained by linear fitting of the slope of a straight line, generally speaking, the weight loss percentage is usually 5-10% at the end of the cable insulation aging life, and the aging state of the insulation is obtained by comparing the obtained activation energy E with the value of crosslinked polyethylene under normal conditions and is used as an auxiliary means for accelerated thermal aging experiment life evaluation.
And (3) accelerated thermal aging life evaluation, namely testing the elongation at break of the sample before and after aging at a certain thermal exposure temperature, generally taking the elongation at break reduced by 50% as the end point of the failure of the sample or the change of the measured performance reaching a specified degree, recording the aging time (thermal life), and correcting the thermal life at the thermal exposure temperature. The thermal life at operating temperature was derived by the point-slope method. That is, the thermal life at operating temperature (90 ℃) is derived according to the arrhenius equation:
wherein, Ts-conductor operating temperature (90 ℃); tau iss-thermal life at operating temperature; t ist-a thermal exposure temperature; tau istLifetime at thermal exposure temperature, b is a constant related to activation energy. From the above formula, the thermal life results for each sample at operating temperature (90 ℃) can be deduced.
It should be noted that, in the above thermal life evaluation, the operating temperature is not limited to 90 ℃, and may be selected and changed according to the actual operating conditions.
As an alternative embodiment, the breakdown characteristic evaluation model is a step-by-step boost test performed on a cable sample, and Weibull distribution is a statistical theory describing a chain weak point failure phenomenon, that is, if the weakest link of a product is damaged, the whole product fails, and insulation breakdown of the cable product is just weak point breakdown. The breakdown distribution rule of the cable can be described by 2-dimensional Weibull distribution, namely:
wherein, UbIs the breakdown voltage; t is tbThe time corresponding to the breakdown; kcIs a constant associated with the cable; n is the life index of the cable, and is generally determined by specific production conditions and operating conditions, from which the life of the cable at any electric field strength can be obtained. According to a large number of research results, crosslinked polyethylene is shown to be electrically conductiveThe service life index of the cable is more than n and 9, and the residual service life of the cable under the corresponding voltage can be obtained by the following formula
Wherein i is the number of pressurization stages; u shapeiTo apply a voltage; t is tiIs UiDuration of action; t is trIs the remaining life of the cable.
Example 2
According to another aspect of the embodiments of the present invention, there is also provided a cable remaining life processing apparatus, and fig. 2 is a schematic view of the cable remaining life processing apparatus according to the embodiments of the present invention, as shown in fig. 2, the cable remaining life processing apparatus includes: an evaluation module 22 and a calculation module 24. The following describes in detail the processing device of the remaining life of the cable.
The evaluation module 22 is used for evaluating the cable based on a preset evaluation model to obtain the insulation state and the residual life of the cable;
and a calculating module 24, connected to the evaluating module 22, for performing a weighted average calculation on the insulation state and the remaining life according to a predetermined weight to obtain a final remaining life of the cable, wherein the predetermined weight is a value determined according to field data of cable operation.
It should be noted here that the above-mentioned evaluation module 22 and calculation module 24 correspond to steps S102 to S104 in embodiment 1, and the above-mentioned modules are the same as the examples and application scenarios realized by the corresponding steps, but are not limited to what is disclosed in embodiment 1 above. It should be noted that the modules described above as part of an apparatus may be implemented in a computer system such as a set of computer-executable instructions.
The device can perform weighted average calculation on the insulation state and the residual life obtained by the preset evaluation model, further obtain the final residual life of the cable, and achieve the purpose of accurately predicting the final residual life of the cable, thereby effectively ensuring the normal maintenance and overhaul of the cable in the power system, ensuring the technical effect of safe and reliable operation of the power system, and further solving the technical problem that the residual life of the cable cannot be accurately evaluated in the prior art.
Optionally, the evaluation module comprises: the first determining unit is used for determining the insulation state of the cable according to the aging factor evaluation model; and the second determining unit is used for determining the residual life of the cable according to the thermal life evaluation model and/or the breakdown characteristic evaluation model.
Optionally, the first determination unit includes: the obtaining subunit is used for obtaining the test current of the cable by using an isothermal relaxation current method; the calculation subunit is used for fitting a current curve generated by the test current and calculating an aging factor; and the determining subunit is used for determining the insulation state according to the aging factor.
Optionally, the calculation subunit adopts the following manner: the first processing subunit is used for fitting by utilizing a third-order exponential decay model to obtain fitting parameters; the second processing subunit is used for obtaining a first parameter and a second parameter based on the fitting parameters, wherein the first parameter is a parameter for representing the interface between the insulating internal crystal and the amorphous interface, and the second parameter is a parameter of polarization caused by aging of the insulating internal crystal; and the third processing subunit is used for obtaining the aging factor according to the ratio of the first parameter and the second parameter.
Optionally, the second determination unit includes: calculating the thermal life τ at the predetermined operating temperature bys：
Wherein, TSIs the operating temperature, T, of the conductortB is a constant associated with activation energy for thermal exposure temperature; and/or calculating the remaining life of the cable at a predetermined voltage by
Wherein i is the number of pressurization stages; u shapeiTo apply a voltage; t is tiIs UiDuration of action.
Example 3
According to another aspect of the embodiments of the present invention, there is also provided a storage medium, where the storage medium includes a stored program, and when the program runs, the apparatus where the storage medium is located is controlled to execute the processing method of the remaining life of the cable according to any one of the above.
Example 4
According to another aspect of the embodiments of the present invention, there is also provided a processor, configured to execute a program, where the program executes a method for processing the remaining life of the cable according to any one of the above methods.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for processing the remaining life of a cable, comprising:
evaluating the cable based on a preset evaluation model to obtain the insulation state and the residual life of the cable;
and carrying out weighted average calculation on the insulation state and the residual life according to a preset weight to obtain the final residual life of the cable, wherein the preset weight is a numerical value determined according to field data of the operation of the cable.
2. The method of claim 1, wherein evaluating the cable based on a predetermined evaluation model, and wherein obtaining the insulation status and the remaining life of the cable comprises:
determining the insulation state of the cable according to an aging factor evaluation model;
determining the remaining life of the cable according to a thermal life evaluation model and/or a breakdown characteristic evaluation model.
3. The method of claim 2, wherein determining the insulation state of the cable according to an aging factor evaluation model comprises:
obtaining the test current of the cable by using an isothermal relaxation current method;
fitting a current curve generated by the test current, and calculating an aging factor;
and determining the insulation state according to the aging factor.
4. The method of claim 3, wherein fitting a current curve generated by the test current and calculating an aging factor is performed by:
fitting by using a third-order exponential decay model to obtain fitting parameters;
obtaining a first parameter and a second parameter based on the fitting parameters, wherein the first parameter is a parameter for representing the insulation internal crystal and amorphous interface, and the second parameter is a parameter of polarization caused by insulation aging;
and obtaining the aging factor according to the ratio of the first parameter to the second parameter.
5. The method of claim 1, wherein determining the remaining life of the cable from the thermal life assessment model and/or the assessment model of the breakdown characteristic comprises:
calculating the thermal life τ at the predetermined operating temperature bys：
Wherein, TSIs the operating temperature, T, of the conductortB is a constant associated with activation energy for thermal exposure temperature;
and/or the presence of a gas in the gas,
the remaining life t of the cable at a predetermined voltage is calculated in the following mannerr：
Wherein i is the number of pressurization stages; u shapeiTo apply a voltage; t is tiIs UiDuration of action.
6. A cable residual life management apparatus, comprising:
the evaluation module is used for evaluating the cable based on a preset evaluation model to obtain the insulation state and the residual life of the cable;
and the calculation module is used for carrying out weighted average calculation on the insulation state and the residual life according to a preset weight to obtain the final residual life of the cable, wherein the preset weight is a numerical value determined according to field data of cable operation.
7. The apparatus of claim 6, wherein the evaluation module comprises:
a first determination unit for determining an insulation state of the cable according to an aging factor evaluation model;
a second determining unit for determining the remaining life of the cable according to the thermal life evaluation model and/or the breakdown characteristic evaluation model.
8. The apparatus according to claim 7, wherein the first determining unit comprises:
the obtaining subunit is used for obtaining the test current of the cable by using an isothermal relaxation current method;
the calculation subunit is used for fitting a current curve generated by the test current and calculating an aging factor;
and the determining subunit is used for determining the insulation state according to the aging factor.
9. A storage medium, characterized in that the storage medium comprises a stored program, wherein when the program runs, the device where the storage medium is located is controlled to execute the processing method of the cable residual life according to any one of claims 1 to 5.
10. A processor, characterized in that the processor is configured to run a program, wherein the program is configured to execute the method for processing the remaining life of the cable according to any one of claims 1 to 5 when running.
Priority Applications (1)
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| CN112379229A (en) * | 2020-11-05 | 2021-02-19 | 江苏亨通海洋光网系统有限公司 | Method for evaluating insulation electrical aging life of submarine optical cable with relay |
| 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 |
| CN112964951A (en) * | 2021-02-08 | 2021-06-15 | 广西顺业线缆有限公司 | Traffic cable aging life assessment system |
| CN113203918A (en) * | 2021-04-28 | 2021-08-03 | 国网河北省电力有限公司培训中心 | Power cable residual life prediction method based on aging factor and unequal-interval GM (1,1) model |
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| CN113884130A (en) * | 2021-09-16 | 2022-01-04 | 广州番禺电缆集团有限公司 | Cable aging prediction method, device and equipment based on cable well environment monitoring |
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