CN110095696B - Cable current-carrying capacity adjusting method, device, equipment and readable storage medium - Google Patents
Cable current-carrying capacity adjusting method, device, equipment and readable storage medium Download PDFInfo
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- CN110095696B CN110095696B CN201910515634.3A CN201910515634A CN110095696B CN 110095696 B CN110095696 B CN 110095696B CN 201910515634 A CN201910515634 A CN 201910515634A CN 110095696 B CN110095696 B CN 110095696B
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- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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- G—PHYSICS
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- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
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Abstract
The invention discloses a method for adjusting the current-carrying capacity of a cable, which comprises the steps of acquiring the temperature change data of a new cable to be evaluated and cables with different operation years in a specified operation state; simulating cable temperature change data to carry out thermal cycle test on the test cable with a plurality of operation years; comparing and analyzing the insulation performance of the test cable subjected to the thermal cycle test with that of the reference cable; and evaluating the current-carrying capacity fluctuation condition of the cable according to the insulation performance fluctuation data and adjusting the current-carrying capacity of the target cable. According to the method, the change of the insulation performance caused by the change of the thermodynamic property in the insulation due to different operation years is analyzed from the angle of XLPE insulation, the critical influence of the difference existing in cable insulation on the semi-crystalline polymer XLPE in the conventional calculation of the current-carrying capacity neglected can be overcome, and the adjustment precision of the current-carrying capacity of the cable is improved. The invention also discloses a device and equipment for adjusting the current-carrying capacity of the cable and a readable storage medium, and the device and the equipment have the beneficial effects.
Description
Technical Field
The invention relates to the technical field of insulation thermal cycle of a crosslinked polyethylene cable, in particular to a method, a device, equipment and a readable storage medium for adjusting the current-carrying capacity of the cable.
Background
The domestic and foreign standards generally consider the influence of a laying mode on the current-carrying capacity on the basis of basic current-carrying capacity when calculating the current-carrying capacity of the cable, and basically follow the mode that room temperature is used as initial temperature, the long-term normal operation working temperature of the cable is 90 ℃ used as final steady-state temperature, the corresponding maximum current is obtained through a thermal circuit method, simulation software and the like, and the adjustment is carried out according to the current waiting value.
The cable is assumed to be in an ideal operation state by the adjusting mode, and actually, the current-carrying capacity of the cable is fluctuated rather than constant and is also influenced by a plurality of factors, so that the method for calculating the current-carrying capacity has great restriction and low evaluation precision, so that the current-carrying capacity adjustment cannot be fit with the actual situation, and the normal operation of the cable is influenced.
Therefore, how to improve the accuracy of adjusting the current-carrying capacity of the cable is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a method for adjusting the current-carrying capacity of a cable, which can improve the accuracy of adjusting the current-carrying capacity of the cable; another object of the present invention is to provide a cable ampacity adjustment device, a cable ampacity adjustment apparatus, and a readable storage medium.
In order to solve the technical problem, the invention provides a method for adjusting the current-carrying capacity of a cable, which comprises the following steps:
acquiring a new cable to be evaluated and cables with different operation years, and taking the obtained cable as a test cable;
acquiring cable temperature change data of the new cable in a specified running state;
performing a thermal cycle test on the test cable with a plurality of operating years according to a preset temperature change rule; the preset temperature change rule is matched with the cable temperature change data;
comparing and analyzing the insulation performance of the test cable subjected to the thermal cycle test and a comparison cable matched with the operation age to obtain insulation performance fluctuation data; wherein the control cable is an original cable that has not been subjected to the thermal cycling test;
evaluating the current-carrying capacity fluctuation condition of the cable according to the insulation performance fluctuation data to generate current-carrying capacity fluctuation analysis data;
adjusting the current-carrying capacity of the target cable according to a preset adjustment rule on the basis of the reference current-carrying capacity according to the current-carrying capacity fluctuation analysis data; and the reference current-carrying capacity is the current-carrying capacity of the new cable in the specified operation state.
Optionally, adjusting the ampacity of the target cable according to a preset adjustment rule on the basis of the reference ampacity according to the ampacity fluctuation analysis data includes:
carrying out fluctuation rule arrangement on the current-carrying capacity fluctuation analysis data according to the operation age to generate current-carrying capacity adjustment rules of each age limit;
determining an operational age of the target cable;
and carrying out current-carrying capacity adjustment on the target cable according to a current-carrying capacity adjustment rule corresponding to the operating life of the target cable.
Optionally, performing fluctuation rule sorting on the ampacity fluctuation analysis data according to the operation age, including:
judging whether the insulation performance after the thermal cycle treatment reaches a preset large reduction standard or not according to the current-carrying capacity fluctuation analysis data corresponding to each operating age;
when the fluctuation quantity does not reach the preset value, generating an up-regulation rule according to the fluctuation quantity;
when the fluctuation amount is reached, a down regulation rule is generated according to the fluctuation amount.
Optionally, acquiring cable temperature change data of the new cable in a specified operating state includes:
acquiring the temperature change condition of the cable when the temperature of the cable conductor is raised from room temperature to a steady state of 90 ℃ in real time to obtain a temperature rise curve;
acquiring an input current effective value corresponding to the new cable when a cable conductor reaches a steady state of 90 ℃, and taking the acquired input current effective value as a reference current-carrying capacity of the target cable;
acquiring the temperature change condition of the cable when the temperature of the cable conductor is reduced from a steady state of 90 ℃ to room temperature in real time to obtain a temperature reduction curve;
and taking the temperature rise curve and the temperature drop curve as the temperature change data of the cable.
Optionally, the acquiring, in real time, a change in the cable temperature of the new cable when the cable conductor is heated from room temperature to a steady state of 90 ℃, includes:
acquiring the temperature change condition of the cable conductor of the new cable in real time when the temperature of the cable conductor is increased from room temperature to a steady state of 90 ℃ under the specified laying condition;
correspondingly, the real-time acquisition of the cable temperature change condition of the new cable when the cable conductor is cooled from the steady state 90 ℃ to the room temperature includes:
and acquiring the temperature change condition of the cable when the temperature of the cable conductor of the new cable is reduced from the steady state 90 ℃ to the room temperature under the specified laying condition in real time.
Optionally, the acquiring a new cable and cables with different operating years, and using the acquired cable as a test cable includes:
acquiring a new cable and cables with different operation years;
cutting each obtained cable into two parts;
respectively taking the two cables obtained by splitting as a test cable and a reference cable; wherein the test cable and the control cable each include a cable having an operational life.
Optionally, the comparing and analyzing the insulation performance of the test cable subjected to the thermal cycle test and a comparison cable matched with the operating life to obtain insulation performance fluctuation data includes:
comparing and analyzing the physical and chemical properties, the electrical properties and the mechanical properties of the test cable subjected to the thermal cycle test and a comparison cable matched with the operation age;
wherein the physicochemical analysis comprises: analyzing microstructure and aggregation state structure;
the electrical analysis comprises: analyzing four parameters of dielectric constant, dielectric loss, conductivity and breakdown field intensity of the dielectric medium;
the mechanical property analysis comprises: and (5) analyzing the mechanical external characteristics.
The invention discloses a cable current-carrying capacity adjusting device, comprising:
the test cable determination unit is used for acquiring a new cable to be evaluated and cables with different operation years and taking the obtained cable as a test cable;
the cable temperature change determining unit is used for acquiring cable temperature change data of the new cable in a specified running state;
the thermal cycle testing unit is used for performing thermal cycle testing on the testing cable with a plurality of operating years according to a preset temperature change rule; the preset temperature change rule is matched with the cable temperature change data;
the insulation performance analysis unit is used for comparing and analyzing the insulation performance of the test cable subjected to the thermal cycle test and a comparison cable matched with the operation age to obtain insulation performance fluctuation data; wherein the control cable is an original cable that has not been subjected to the thermal cycling test;
the fluctuation analysis unit is used for evaluating the current-carrying capacity fluctuation condition of the cable according to the insulation performance fluctuation data and generating current-carrying capacity fluctuation analysis data;
the current-carrying capacity adjusting unit is used for adjusting the current-carrying capacity of the target cable according to the current-carrying capacity fluctuation analysis data and a preset adjusting rule on the basis of the reference current-carrying capacity; and the reference current-carrying capacity is the current-carrying capacity of the new cable in the specified operation state.
The invention discloses a cable current-carrying capacity adjusting device, which comprises:
a memory for storing a program;
and the processor is used for realizing the steps of the cable current-carrying capacity adjusting method when the program is executed.
The invention discloses a readable storage medium, wherein a program is stored on the readable storage medium, and the program realizes the steps of the cable current-carrying capacity adjusting method when being executed by a processor.
According to the method for adjusting the current-carrying capacity of the cable, the new cable to be evaluated and the cables with different operation years are obtained, and the obtained cable is used as a test cable; acquiring cable temperature change data of a new cable in a specified running state; carrying out thermal cycle test on a test cable with a plurality of operation years according to a preset temperature change rule matched with the cable temperature change data; comparing and analyzing the insulation performance of the test cable subjected to the thermal cycle test and a comparison cable matched with the operation age to obtain insulation performance fluctuation data; evaluating the current-carrying capacity fluctuation condition of the cable according to the insulation performance fluctuation data to generate current-carrying capacity fluctuation analysis data; adjusting the current-carrying capacity of the target cable according to a preset adjustment rule on the basis of the reference current-carrying capacity according to the current-carrying capacity fluctuation analysis data; and the reference current-carrying capacity is the current-carrying capacity of the new cable in a specified operation state. The method starts from the angle of the heat resistance of a crosslinked polyethylene material, and considers the influence of the change of the thermodynamic property inside the insulation of the cable caused by different operation years on the insulation property, the scheme can overcome the key influence of the difference of cable insulation on the semi-crystalline polymer XLPE, which is neglected by the current-carrying capacity calculation, and analyzes the change of the thermodynamic property inside the insulation caused by different operation years on the insulation property from the angle of XLPE insulation, so that the current-carrying capacity of the existing cable is finally adjusted, and the adjustment precision of the current-carrying capacity of the cable is improved.
The invention also discloses a cable current-carrying capacity adjusting device, equipment and a readable storage medium, which have the beneficial effects and are not described herein again.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a method for adjusting a current-carrying capacity of a cable according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for adjusting a current-carrying capacity of a cable according to an embodiment of the present invention;
fig. 3 is a block diagram of a structure of a cable ampacity adjustment device according to an embodiment of the present invention;
fig. 4 is a block diagram of a structure of a cable current-carrying capacity adjusting apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a cable current-carrying capacity adjustment device according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide a method for adjusting the current-carrying capacity of a cable, which can improve the accuracy of adjusting the current-carrying capacity of the cable; the invention also provides a cable current-carrying capacity adjusting device, equipment and a readable storage medium.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
During the actual operation of a cable, the current carrying capacity of the cable is affected by many factors, such as the manner of laying and the cable gauge. The calculation of the current carrying capacity of XLPE cables by thermal circuit methods and simulation software is common and follows the basic principle of calculating the maximum current through a conductor, corresponding to a steady state temperature of 90 ℃ in different environments. Since the crystal structure of XLPE is determined by the calcination and cooling processes, XLPE is mainly affected by thermal effects, which can greatly change the insulating morphology over a long period of time.
The effect of heat on the polymer is a complex process, and the inverse temperature effect shows that degradation of semi-crystalline polymers is evident at low temperatures, and performance may be restored at higher temperatures. In studies on the non-isothermal melt crystallization kinetics of polymers it is known that the ability of XLPE to cystinate is strongly influenced by the cooling rate of XLPE and the current salting situation, since different catalysis and cooling rates can change the shape, size and distribution level of spherulites determining certain specific electrical properties of XLPE. It is therefore of great importance to study the variation in properties of XLPE at different melting and cooling rates.
At present, the current-carrying capacity of a cable is generally calculated by taking room temperature as initial temperature and taking the long-term normal operation working temperature of the cable as final steady-state temperature, obtaining corresponding maximum current through a thermal circuit method, simulation software and the like, and adjusting according to a current waiting value. This approach ignores the changes in the XLPE insulation itself due to different aging factors and the effects on the material of the heating and cooling processes under the cable operating conditions, which will completely change the morphology of the XLPE. The microstructure of the XLPE insulating material changes with factors such as heat and electricity, and the thermal resistance and the thermal capacity of the XLPE in a thermal circuit model are variable.
Aiming at the problems that the thermal resistance and the heat capacity in the insulating layer are different due to obvious difference of aggregation state structures in XLPE insulation in different aging stages, and the current-carrying capacity of the cable is further changed, an adjusting scheme of the cable with different aging degrees under the reference current-carrying capacity is made through comparing experiments of cables with different operation years in the same laying environment.
It should be noted that the present invention is mainly directed to a method for adjusting the current-carrying capacity of cables based on XLPE insulation, crosslinked polyethylene (XLPE) being a high molecular polymer with crystalline and amorphous phases, which is widely used as cable insulation due to its high performance in terms of electrical and thermal properties. The present invention takes XLPE cable insulation as an example, and other cable insulation materials can refer to the description of this embodiment, and are not described herein again.
The first embodiment is as follows:
referring to fig. 1, fig. 1 is a flowchart of a method for adjusting a current-carrying capacity of a cable according to the present embodiment; the method can comprise the following steps:
and step s110, acquiring a new cable to be evaluated and cables with different operation years, and taking the obtained cable as a test cable.
XLPE power cables of a certain specification, including new cables and cables of different operational ages, are first selected, sliced, sampled and grouped by age for subsequent testing.
Since the subsequent insulation performance comparison analysis of the test cable performance and the control cable with the same operating life is required, preferably, the process of determining the test cable may specifically be:
acquiring a new cable and cables with different operation years;
cutting each obtained cable into two parts;
respectively taking the two cables obtained by splitting as a test cable and a reference cable; wherein, the test cable and the comparison cable respectively comprise cables with each operation age.
The test cable and the comparison cable are determined by the means, so that the initial insulation performance of the test cable and the initial insulation performance of the comparison cable can be ensured to be the same, and the influence of other factors on the insulation performance can be eliminated.
And step s120, acquiring cable temperature change data of the new cable in a specified operation state.
For the external environment difference under different operation states (such as load increase and the like), different heating and cooling processes exist in the cable under the condition that the same current is introduced, and different heating rates and cooling rates can affect the aggregation state structure of the cable insulation, so that the operation performance of the cable is further affected. The purpose of this step is to determine the variation of the temperature of the cable over time with different operating years, so that the variation of the properties of the insulation of the cable can be determined further on the basis of this temperature variation data.
The temperature change data mainly comprises temperature rise change data and temperature drop change data, the temperature rise change data refers to data that the temperature of the target cable is increased along with the time under the specified operation state, the temperature drop change data refers to data that the temperature of the target cable is reduced along with the time under the specified operation state, and due to the influence of various other factors (such as environmental factors, current factors and the like), the data generated in the temperature rise stage are temperature rise change data and the data generated in the temperature drop stage are temperature drop change data.
The specified running state refers to factors which can affect the insulation temperature of the cable, such as the current of the cable and the state of an external environment, the set specified running state is not limited in the embodiment, and devices which can realize different laying states can be selected according to actual conditions to carry out temperature change simulation. In order to comprehensively determine the cable temperature rise and the performance change process under the temperature drop change in each operating life, preferably, the process of acquiring the cable temperature change data of the new cable in the specified operating state may specifically include the following steps:
acquiring the temperature change condition of the cable when the temperature of the cable conductor is raised from room temperature to a steady state of 90 ℃ in real time to obtain a temperature rise curve;
acquiring an input current effective value corresponding to a new cable when a cable conductor reaches a steady state of 90 ℃, and taking the acquired input current effective value as a reference current-carrying capacity of a target cable;
acquiring the temperature change condition of the cable when the temperature of the cable conductor is reduced from a steady state of 90 ℃ to room temperature in real time to obtain a temperature reduction curve;
and taking the temperature rise curve and the temperature drop curve as cable temperature change data.
The temperature of the cable conductor can be collected by collecting the temperature of the cable insulation inner layer, and other measurement methods can be adopted, which are not described herein.
Furthermore, the cable ampacity can be considered to be a fluctuating value rather than a constant over time in the same environment for XLPE cables of the same gauge. The optimal current-carrying capacity is analyzed from the perspective of the cable laying mode, different heating and cooling processes of the cable exist under the condition that the same current is introduced to the cable due to the difference of external environments of actual running cables with different laying modes, different heating rates and different cooling rates have different degrees of influence on the aggregation state structure of the cable insulation, and the physical, chemical, electrical and mechanical properties of the insulation material are changed. Therefore, preferably, the process of acquiring the cable temperature change condition of the new cable in real time when the cable conductor is heated from room temperature to the steady state of 90 ℃ may further be: acquiring the temperature change condition of the cable conductor of the new cable in real time when the temperature of the cable conductor is increased from room temperature to a steady state of 90 ℃ under the specified laying condition; correspondingly, the process of acquiring the cable temperature change condition of the new cable when the cable conductor is cooled from the steady state 90 ℃ to the room temperature in real time may specifically be: and acquiring the temperature change condition of the cable when the temperature of the cable conductor of the new cable is reduced from the steady state 90 ℃ to the room temperature under the specified laying condition in real time. For example, according to a cable model under direct-buried installation, a sensor is led into a cable conductor by drilling a hole in the cable to determine the cable temperature change condition when the temperature of the cable insulation inner layer of a new cable is increased from room temperature to 90 ℃ in a steady state, and the cable temperature change condition when the temperature is decreased from 90 ℃ in the steady state to room temperature, and the obtained data is used as cable temperature change data.
In the step, the cable temperature change data of the new cable in different operation states are used as a reference to perform subsequent thermal cycle test, so that the influence of other factors existing in other cables with different operation years is eliminated, and the insulation performance change condition of the cable insulation with different operation years can be judged more accurately.
And step s130, performing thermal cycle test on the test cable with a plurality of operation years according to a preset temperature change rule.
The preset temperature change rule is matched with the cable temperature change data, namely the cable temperature change data of the test cable in the specified running state obtained through simulation is used for carrying out thermal cycle test on the test cable, the thermal cycle test process mainly comprises the steps of carrying out temperature rise on cable insulation and testing the performance change of the cable insulation through temperature drop, and the thermal cycle test aims at determining the cable insulation change conditions of the cables with different running years under the preset temperature change rule due to the fact that the cable insulation change conditions are different under the different running years, so that the insulation performance of the cables subjected to the thermal cycle test and the cables not subjected to the thermal cycle test can be analyzed subsequently.
When the thermal cycle test is performed on the cable insulation, the temperature change modes under each laying mode need to be corresponded, that is, the temperature change rule of the cable insulation is matched with the temperature change data corresponding to the specified laying mode, and the temperature change data corresponding to the laying mode in the step s120 is fitted as much as possible.
In this embodiment, the test equipment for implementing the thermal cycle test is not limited, and for example, the temperature-adjustable aging box may perform a simulated thermal cycle test on the new cable and the cable samples with different operation ages according to the temperature rise and temperature drop curves obtained in step s120 for each cable after grouping, and the like, so that the temperature change matched with the cable temperature change data may be implemented.
And step s140, comparing and analyzing the insulation performance of the test cable subjected to the thermal cycle test and the comparison cable matched with the operation age to obtain insulation performance fluctuation data.
The comparison cable is an original cable which is not subjected to the thermal cycle test, for example, the cable which is not subjected to the thermal cycle test and has the annual operating life is analyzed and compared with the cable which is subjected to the thermal cycle test and has the annual operating life, and the operating life of the cables which are compared with the insulating performance needs to be matched, so that the influence of the operating life on the insulating performance can be eliminated. Preferably, in order to eliminate the interference of the influence on the cable insulation performance under other operation factors on the performance analysis comparison process, the obtained original test cable is cut into two parts as much as possible, as in the step s 110.
The items for analyzing and comparing the insulation performance can be set in a self-matching manner according to needs, for example, tensile performance analysis, breakdown voltage analysis and the like can be set, and various insulation performance analyses aim at observing the change condition of the characteristic quantity of the test group sample compared with the reference group after multiple thermal cycles. Preferably, the process of performing insulation performance comparison analysis specifically may include: comparing and analyzing the physical and chemical properties, the electrical properties and the mechanical properties of the test cable subjected to the thermal cycle test and a comparison cable matched with the operation age; wherein, the physicochemical analysis may comprise: analyzing microstructure and aggregation state structure; the electrical analysis includes: analyzing four parameters of dielectric constant, dielectric loss, conductivity and breakdown field intensity of the dielectric medium; the mechanical property analysis comprises the following steps: and (5) analyzing the mechanical external characteristics. The analysis items generally cover all insulation performance influence factors, and the insulation performance analysis can be performed in the aspects to realize the comprehensive analysis of the insulation performance of the cable by temperature, so that the accuracy of current-carrying capacity analysis is further improved.
And s150, evaluating the current-carrying capacity fluctuation condition of the cable according to the insulation performance fluctuation data, and generating current-carrying capacity fluctuation analysis data.
The original insulation performance data is insulation performance data of an original cable which is not subjected to a thermal cycle test, the test insulation performance data obtained through the thermal cycle test is compared with the original insulation performance data to generate cable carrying capacity fluctuation data, and the cable carrying capacity fluctuation data show the influence of temperature change on the insulation performance of cable insulation.
Step s160, adjusting the current-carrying capacity of the target cable according to a preset adjustment rule on the basis of the reference current-carrying capacity according to the current-carrying capacity fluctuation analysis data; and the reference current-carrying capacity is the current-carrying capacity of the new cable in a specified operation state.
Evaluating the current-carrying capacity fluctuation conditions of cables in different laying modes according to the insulation performance parameters of each group, and estimating the current-carrying capacity I in the referenceRIs adjusted on the basis of the reference current-carrying capacity IRThe process of adjustment can be adjusted based on the size of the insulation performance variable quantity, the insulation performance parameters of each group are compared with the performance of unprocessed samples, and the standard current-carrying capacity I of cables with the same specification based on different operation years is obtainedRThe current-carrying capacity adjustment scheme.
Specifically, the process of adjusting the current-carrying capacity of the target cable according to the cable current-carrying capacity fluctuation data and the preset adjustment rule may specifically include the following steps:
carrying out fluctuation rule arrangement on the current-carrying capacity fluctuation analysis data according to the operation age to generate current-carrying capacity adjustment rules of each age;
determining the operating life of the target cable;
and carrying out current-carrying capacity adjustment on the target cable according to a current-carrying capacity adjustment rule corresponding to the operating life of the target cable.
In order to ensure the efficient operation of the cable, the obtained current-carrying capacity adjusting scheme can be specifically that the performance of a sample subjected to thermal cycle treatment becomes good or basically unchanged, and the reference current-carrying capacity I can be adjusted upwardsRThe performance is greatly deteriorated, and the reference current-carrying capacity I should be adjusted downwardR. Specifically, the fluctuation rule arrangement is performed on the ampacity fluctuation analysis data according to the operation age, and includes:
judging whether the insulation performance after the thermal cycle treatment reaches a preset large reduction standard or not according to current-carrying capacity fluctuation analysis data corresponding to each operation age;
when the fluctuation quantity does not reach the preset value, generating an up-regulation rule according to the fluctuation quantity;
when the fluctuation amount is reached, a down regulation rule is generated according to the fluctuation amount.
The specific large reduction standard may be set according to an actual operation condition, and is not limited in this embodiment.
Based on the technical scheme, the method for adjusting the current-carrying capacity of the cable provided by the embodiment evaluates the current-carrying capacity change of the cable through an actual experiment in consideration of the influence of the change of the thermodynamic property in the insulation of the cable caused by different operation years on the insulation performance from the perspective of the heat resistance of the crosslinked polyethylene material, so that the condition of the cable which is more in line with the actual situation is obtained, and the evaluation result is more accurate; and a new idea is provided for formulating the current-carrying capacity of XLPE power cables with the same specification in different operation years.
Example two:
in order to deepen the understanding of the method for adjusting the current-carrying capacity of the cable provided by the present invention, the embodiment takes a specific implementation process of performing a cable sample thermal cycle treatment and a cable insulation performance analysis experiment on an XLPE power cable with a known specification, and evaluating the current-carrying capacity of the cable with different operation years as an example.
The schematic flow chart of the cable ampacity adjustment scheme in this embodiment is shown in fig. 2, and specifically includes the following steps:
the required known XLPE cables with the same specification are obtained and are divided into spare cables, cables which actually run for 15 years and cables which actually run for 30 years. And slicing the cable close to the inner layer insulating layer to obtain a 0.4mm sample, and grouping the samples according to the age limit, wherein each group comprises a reference group and a test group.
1. The standby XLPE power cable with the known specification is tested in an air laying mode, a cable body is firstly drilled to the position close to the insulating inner layer of a conductor, a temperature sensor is placed in the hole to measure the real-time change of the temperature, the current value corresponding to the cable at the steady-state temperature of 90 ℃ is measured by applying current through a feed-through transformer, and the current value is named as reference current-carrying capacity IRAnd recordThe temperature of the cable is increased from room temperature to 90 ℃ and the temperature of the cable is decreased from 90 ℃ to room temperature.
2. According to the curve of the temperature rising process and the temperature reducing process obtained in the step 1, fitting of a temperature curve is carried out through a temperature-adjustable aging heating box, and the standard current-carrying capacity I is carried out on the test group in 3 groups of well-grouped samplesRThermal cycling accelerated aging test.
3. The thermal cycle accelerated aging test comprises 3 stages, wherein the actual temperature change curve of the step 1 is fitted in the temperature rise stage and the temperature fall stage, and a constant temperature stage of 2 hours is added between the temperature rise stage and the temperature fall stage.
Each sample was subjected to 25 thermal cycles.
4. And (3) analyzing the relevant physical and chemical properties, electrical properties and mechanical properties of each group of test groups subjected to thermal cycling treatment and a reference group not subjected to thermal cycling treatment.
The physical and chemical property analysis test specifically comprises the following steps: DSC experiment and flurier infrared spectrum experiment. Electrical analysis: space charge, breakdown voltage, conductance current, etc. The mechanical property analysis experiment is as follows: and (4) tensile test.
5. By comparing the thermodynamic property difference of cable samples caused by different actual operation times of XLPE cables with the same specification, the performance change among cable samples with different operation years under the reference current-carrying capacity IR can be obtained in the comparison of performance analysis experiments, so that the current-carrying capacity adjustment strategy under the corresponding conditions can be obtained.
That is, the material performance of the cable can be kept in a better state after long-term temperature circulation, and the reference current-carrying capacity I of the cable can be realizedRAnd on the basis, adjusting upwards, and otherwise, adjusting downwards.
The cable current-carrying capacity adjusting scheme provided by the embodiment realizes effective analysis of performance change conditions of XLPE with different melting and cooling speeds, is simple and easy to implement, can generate a high-precision adjusting scheme aiming at cables with different aging degrees, and ensures high-efficiency operation of the cables.
Example three:
referring to fig. 3, fig. 3 is a block diagram of a cable current-carrying capacity adjustment apparatus provided in this embodiment; the apparatus may include: a test cable determination unit 210, a cable temperature change determination unit 220, a thermal cycle test unit 230, an insulation performance analysis unit 240, a fluctuation analysis unit 250, and a current capacity adjustment unit 260. The cable ampacity adjusting device provided by the embodiment can be contrasted with the cable ampacity adjusting method.
The test cable determining unit 210 is mainly configured to obtain a new cable to be evaluated and cables with different operation years, and use the obtained cable as a test cable;
the cable temperature change determining unit 220 is mainly used for acquiring cable temperature change data of a new cable in a specified operation state;
the thermal cycle test unit 230 is mainly used for performing a thermal cycle test on a test cable with a plurality of operation years according to a preset temperature change rule; the preset temperature change rule is matched with the cable temperature change data;
the insulation performance analysis unit 240 is mainly used for comparing and analyzing the insulation performance of the test cable subjected to the thermal cycle test and a comparison cable matched with the operation age to obtain insulation performance fluctuation data; wherein the control cable is an original cable which is not subjected to a thermal cycle test;
the fluctuation analysis unit 250 is mainly used for evaluating the fluctuation condition of the current-carrying capacity of the cable according to the insulation performance fluctuation data and generating current-carrying capacity fluctuation analysis data;
the current-carrying capacity adjusting unit 260 is mainly used for adjusting the current-carrying capacity of the target cable according to a preset adjusting rule on the basis of the reference current-carrying capacity according to the current-carrying capacity fluctuation analysis data; and the reference current-carrying capacity is the current-carrying capacity of the new cable in a specified operation state.
Optionally, the current-carrying capacity adjusting unit may specifically include:
the rule determining subunit is used for carrying out fluctuation rule arrangement on the current-carrying capacity fluctuation analysis data according to the operation age to generate current-carrying capacity adjustment rules of each age;
an age determining subunit, configured to determine an operating age of the target cable;
and the rule adjusting subunit is used for adjusting the current-carrying capacity of the target cable according to the current-carrying capacity adjusting rule corresponding to the operating life of the target cable.
Optionally, the rule determining subunit specifically includes:
the judging subunit is used for judging whether the insulation performance after the thermal cycle treatment reaches a preset large reduction standard or not according to the current-carrying capacity fluctuation analysis data corresponding to each operating life;
the up-regulation subunit is used for generating an up-regulation rule according to the fluctuation quantity when the fluctuation quantity does not reach the preset value;
and the downward regulation subunit is used for generating a downward regulation rule according to the fluctuation amount when the fluctuation amount is reached.
Optionally, the cable temperature change determining unit may specifically include:
the first acquisition subunit is used for acquiring the temperature change condition of the cable when the temperature of the cable conductor is raised from room temperature to a steady state of 90 ℃ in real time to obtain a temperature rise curve;
the second obtaining subunit is used for obtaining an input current effective value corresponding to the new cable when the cable conductor reaches a steady state of 90 ℃, and taking the obtained input current effective value as a reference current-carrying capacity of the target cable;
the third acquisition subunit is used for acquiring the temperature change condition of the cable when the temperature of the cable conductor is reduced from the steady state 90 ℃ to the room temperature in real time to obtain a temperature reduction curve;
and the change determining subunit is used for taking the temperature rise curve and the temperature drop curve as the temperature change data of the cable.
Optionally, the second obtaining subunit may be specifically configured to: acquiring the temperature change condition of the cable conductor of the new cable in real time when the temperature of the cable conductor is increased from room temperature to a steady state of 90 ℃ under the specified laying condition;
accordingly, the third acquisition subunit may be specifically configured to: and acquiring the temperature change condition of the cable when the temperature of the cable conductor of the new cable is reduced from the steady state 90 ℃ to the room temperature under the specified laying condition in real time.
Optionally, the test cable determining unit may specifically include:
a cable acquisition subunit for acquiring new cables and cables having different operational years;
the cable splitting subunit is used for splitting each obtained cable into two parts;
the cable dividing subunit is used for respectively using the two split cables as a test cable and a comparison cable; wherein, the test cable and the comparison cable respectively comprise cables with each operation age.
Optionally, the insulation performance analysis unit may specifically include:
the physical and chemical analysis subunit is used for analyzing the microstructure and the aggregation state structure of the test cable subjected to the thermal cycle test and the comparison cable matched with the operation age;
the electrical analysis subunit is used for analyzing four parameters of dielectric constant, dielectric loss, conductivity and breakdown field strength of the dielectric medium of the test cable subjected to the thermal cycle test and the comparison cable matched with the operation age;
and the mechanical analysis subunit is used for carrying out mechanical external characteristic analysis on the test cable subjected to the thermal cycle test and the comparison cable matched with the operation age.
The cable ampacity adjusting device that this embodiment provided is to cable ampacity adjustment accuracy height.
Example four:
referring to fig. 4, fig. 4 is a block diagram of a structure of a cable current-carrying capacity adjusting apparatus provided in this embodiment; the apparatus may include: a memory 300 and a processor 310. The cable ampacity adjusting device can refer to the introduction of the cable ampacity adjusting method.
The memory 300 is mainly used for storing programs;
the processor 310 is mainly used for implementing the steps of the cable ampacity adjustment method when executing the program.
Referring to fig. 5, a schematic structural diagram of a cable ampacity adjustment device provided in this embodiment is shown, where the adjustment device may generate a relatively large difference due to different configurations or performances, and may include one or more processors (CPUs) 322 (e.g., one or more processors) and a memory 332, and one or more storage media 330 (e.g., one or more mass storage devices) storing an application 342 or data 344. Memory 332 and storage media 330 may be, among other things, transient storage or persistent storage. The program stored on the storage medium 330 may include one or more modules (not shown), each of which may include a series of instructions operating on a data processing device. Still further, the central processor 322 may be configured to communicate with the storage medium 330 to execute a series of instruction operations in the storage medium 330 on the adjustment device 301.
The scaling device 301 may also include one or more power supplies 326, one or more wired or wireless network interfaces 350, one or more input-output interfaces 358, and/or one or more operating systems 341, such as Windows Server, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, and so forth.
The steps in the cable ampacity adjusting method described above may be implemented by the structure of the cable ampacity adjusting apparatus provided in this embodiment.
Example five:
the embodiment discloses a readable storage medium, where a program is stored on the readable storage medium, and the program is executed by a processor to implement a step of a cable ampacity adjustment method, where the cable ampacity adjustment method may refer to the embodiment corresponding to fig. 1, and details are not described here again.
The readable storage medium may be a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and various other readable storage media capable of storing program codes.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The method, the device, the equipment and the readable storage medium for adjusting the current-carrying capacity of the cable provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A method for adjusting the current-carrying capacity of a cable is characterized by comprising the following steps:
acquiring a new cable to be evaluated and cables with different operation years, and taking the obtained cable as a test cable;
acquiring cable temperature change data of the new cable in a specified running state;
performing a thermal cycle test on the test cable with a plurality of operating years according to a preset temperature change rule; the preset temperature change rule is matched with the cable temperature change data;
comparing and analyzing the insulation performance of the test cable subjected to the thermal cycle test and a comparison cable matched with the operation age to obtain insulation performance fluctuation data; wherein the control cable is an original cable that has not been subjected to the thermal cycling test;
evaluating the current-carrying capacity fluctuation condition of the cable according to the insulation performance fluctuation data to generate current-carrying capacity fluctuation analysis data;
adjusting the current-carrying capacity of the target cable according to a preset adjustment rule on the basis of the reference current-carrying capacity according to the current-carrying capacity fluctuation analysis data; and the reference current-carrying capacity is the current-carrying capacity of the new cable in the specified operation state.
2. The method for adjusting the ampacity of a cable according to claim 1, wherein the adjusting the ampacity of the target cable according to the reference ampacity based on the ampacity fluctuation analysis data and the preset adjustment rule comprises:
carrying out fluctuation rule arrangement on the current-carrying capacity fluctuation analysis data according to the operation age to generate current-carrying capacity adjustment rules of each age limit;
determining an operational age of the target cable;
and carrying out current-carrying capacity adjustment on the target cable according to a current-carrying capacity adjustment rule corresponding to the operating life of the target cable.
3. The method for adjusting the current-carrying capacity of the cable according to claim 2, wherein the step of performing fluctuation rule arrangement on the current-carrying capacity fluctuation analysis data according to the operation period comprises the following steps:
judging whether the insulation performance after the thermal cycle treatment reaches a preset large reduction standard or not according to the current-carrying capacity fluctuation analysis data corresponding to each operating age;
when the fluctuation quantity does not reach the preset value, generating an up-regulation rule according to the fluctuation quantity;
when the fluctuation amount is reached, a down regulation rule is generated according to the fluctuation amount.
4. The method for adjusting the current-carrying capacity of the cable according to claim 1, wherein acquiring the cable temperature change data of the new cable in the specified operation state comprises:
acquiring the temperature change condition of the cable when the temperature of the cable conductor is raised from room temperature to a steady state of 90 ℃ in real time to obtain a temperature rise curve;
acquiring an input current effective value corresponding to the new cable when a cable conductor reaches a steady state of 90 ℃, and taking the acquired input current effective value as a reference current-carrying capacity of the target cable;
acquiring the temperature change condition of the cable when the temperature of the cable conductor is reduced from a steady state of 90 ℃ to room temperature in real time to obtain a temperature reduction curve;
and taking the temperature rise curve and the temperature drop curve as the temperature change data of the cable.
5. The method for adjusting the current-carrying capacity of the cable according to claim 4, wherein the real-time collection of the temperature change of the cable when the temperature of the cable conductor rises from room temperature to a steady state of 90 ℃ comprises:
acquiring the temperature change condition of the cable conductor of the new cable in real time when the temperature of the cable conductor is increased from room temperature to a steady state of 90 ℃ under the specified laying condition;
correspondingly, the real-time acquisition of the cable temperature change condition of the new cable when the cable conductor is cooled from the steady state 90 ℃ to the room temperature includes:
and acquiring the temperature change condition of the cable when the temperature of the cable conductor of the new cable is reduced from the steady state 90 ℃ to the room temperature under the specified laying condition in real time.
6. The method for adjusting the current-carrying capacity of a cable according to claim 1, wherein the step of obtaining a new cable and cables having different operating years and using the obtained cables as test cables comprises:
acquiring a new cable and cables with different operation years;
cutting each obtained cable into two parts;
respectively taking the two cables obtained by splitting as a test cable and a reference cable; wherein the test cable and the control cable each include a cable having an operational life.
7. The method for adjusting the current-carrying capacity of the cable according to claim 1, wherein the step of comparing and analyzing the insulation performance of the test cable subjected to the thermal cycle test with a reference cable matched with the operating life to obtain insulation performance fluctuation data comprises the following steps:
comparing and analyzing the physical and chemical properties, the electrical properties and the mechanical properties of the test cable subjected to the thermal cycle test and a comparison cable matched with the operation age;
wherein the physicochemical analysis comprises: analyzing microstructure and aggregation state structure;
the electrical analysis comprises: analyzing four parameters of dielectric constant, dielectric loss, conductivity and breakdown field intensity of the dielectric medium;
the mechanical property analysis comprises: and (5) analyzing the mechanical external characteristics.
8. A cable ampacity adjustment device, comprising:
the test cable determination unit is used for acquiring a new cable to be evaluated and cables with different operation years and taking the obtained cable as a test cable;
the cable temperature change determining unit is used for acquiring cable temperature change data of the new cable in a specified running state;
the thermal cycle testing unit is used for performing thermal cycle testing on the testing cable with a plurality of operating years according to a preset temperature change rule; the preset temperature change rule is matched with the cable temperature change data;
the insulation performance analysis unit is used for comparing and analyzing the insulation performance of the test cable subjected to the thermal cycle test and a comparison cable matched with the operation age to obtain insulation performance fluctuation data; wherein the control cable is an original cable that has not been subjected to the thermal cycling test;
the fluctuation analysis unit is used for evaluating the current-carrying capacity fluctuation condition of the cable according to the insulation performance fluctuation data and generating current-carrying capacity fluctuation analysis data;
the current-carrying capacity adjusting unit is used for adjusting the current-carrying capacity of the target cable according to the current-carrying capacity fluctuation analysis data and a preset adjusting rule on the basis of the reference current-carrying capacity; and the reference current-carrying capacity is the current-carrying capacity of the new cable in the specified operation state.
9. A cable ampacity adjustment device, comprising:
a memory for storing a program;
a processor for implementing the steps of the method for adjusting the current-carrying capacity of a cable according to any one of claims 1 to 7 when executing the program.
10. A readable storage medium, characterized in that the readable storage medium stores a program, and the program is executed by a processor to implement the steps of the cable ampacity adjustment method according to any one of claims 1 to 7.
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| CN114167235B (en) * | 2021-11-30 | 2023-08-18 | 广东电网有限责任公司 | Insulation state evaluation method and device for high-voltage cable based on heat capacity change |
| CN114325260A (en) * | 2021-12-06 | 2022-04-12 | 广东电网有限责任公司 | Insulation state evaluation method and device of high-voltage cable based on thermal resistance change |
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| DE2440949B1 (en) * | 1974-08-27 | 1975-10-23 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Testing current carrying capacity of superconducting cables - involves iron core premagnetisation in heavy transformer without additional equipment |
| CN102103173A (en) * | 2011-01-13 | 2011-06-22 | 山东电力集团公司菏泽供电公司 | Method and system for monitoring current-carrying capacity of cable based on distributed optical fiber temperature measuring method |
| CN102323496A (en) * | 2011-05-31 | 2012-01-18 | 广东电网公司广州供电局 | System for monitoring current-carrying capacity of cable conductor and method |
| CN102707745B (en) * | 2012-06-25 | 2014-07-23 | 上海理工大学 | Temperature control method based on symbol identification in cable current-carrying capacity heat cycling test |
| CN103048568B (en) * | 2012-12-21 | 2015-10-21 | 广东电网公司佛山供电局 | Three-core cable laid in cable duct current-carrying method for determination of amount and certainty annuity |
| CN104407247B (en) * | 2014-11-24 | 2017-06-06 | 广州供电局有限公司 | Two determination method and apparatus of parallel direct-burried cabling current-carrying capacity |
| CN105677987B (en) * | 2016-01-11 | 2018-10-16 | 四川明星电缆股份有限公司 | The computational methods of flexible mineral insulation current-carrying capacity of cable, verification device and method |
| CN109490664A (en) * | 2018-10-30 | 2019-03-19 | 国网江苏省电力有限公司南通供电分公司 | A kind of practical carrying current calculation method of underground laying distribution line cable |
| CN109633334A (en) * | 2018-12-29 | 2019-04-16 | 广东电网有限责任公司 | A kind of electric heating combines thermal cycling ageing method, apparatus, equipment and storage medium |
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