CN115186528A - Cable current-carrying capacity estimation method and device, storage medium and equipment - Google Patents
Cable current-carrying capacity estimation method and device, storage medium and equipment Download PDFInfo
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- CN115186528A CN115186528A CN202210628960.7A CN202210628960A CN115186528A CN 115186528 A CN115186528 A CN 115186528A CN 202210628960 A CN202210628960 A CN 202210628960A CN 115186528 A CN115186528 A CN 115186528A
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Abstract
The invention discloses a method, a device, equipment and a storage medium for estimating the current-carrying capacity of a cable, and relates to the technical field of power cables. The main aim at improves that current when cable current-carrying capacity is analyzed mainly based on cable inner structure and cable material etc. do not consider other factors that produce the influence to the cable temperature rise to make current cable current-carrying capacity estimate the not accurate problem inadequately. The method comprises the following steps: constructing a cable model and calculating a first current-carrying capacity according to the cable model, wherein the first current-carrying capacity is the basic current-carrying capacity of the cable; configuring a cable coating and a coating parameter corresponding to the cable coating in the cable model; calculating a second current-carrying capacity based on the coating parameter and the first current-carrying capacity, the second current-carrying capacity being a cable current-carrying capacity coated with the cable coating.
Description
Technical Field
The invention relates to the technical field of power cables, in particular to a method, a device, a storage medium and equipment for estimating the current-carrying capacity of a cable.
Background
With the high-speed development of economy, the power demand is continuously increased, the requirement on power transmission reliability is also improved, and the current-carrying capacity of a power cable is one of important indexes for measuring the power transmission capacity of a line. The current-carrying capacity of the power cable refers to the magnitude of current which can pass under the premise that the cable line runs in a steady state and the maximum allowable temperature of the wire core is not exceeded, and the current-carrying capacity of the power cable is reasonably distributed, so that power resources can be effectively utilized.
The current-carrying distribution of the power cable is generally judged according to the conductor temperature in the cable and accessories, and the conductor temperature in the cable and accessories is an important basis for determining the magnitude of current allowed to pass through a wire core in steady-state operation, so that the current-carrying capacity of the cable can be developed to the maximum extent by accurately acquiring the conductor temperature. At present, when the current-carrying capacity of a cable is analyzed, the current-carrying capacity is mainly analyzed based on the internal structure of the cable, the material of the cable and the like, and other factors influencing the temperature rise of the cable are not considered, so that the current-carrying capacity of the existing cable is not accurately estimated, and therefore a more accurate analysis mode is urgently needed to estimate the current-carrying capacity.
Disclosure of Invention
In view of this, the present invention provides a method, an apparatus, a device, and a storage medium for estimating a current-carrying capacity of a cable, which mainly aims to solve the technical problem that the current-carrying capacity of the cable is not accurately estimated due to the fact that the current-carrying capacity of the cable is mainly analyzed based on an internal structure of the cable, a cable material, and the like, and other factors that affect the temperature rise of the cable are not considered.
According to an aspect of the present invention, there is provided a method for estimating current-carrying capacity of a cable, comprising:
constructing a cable model and calculating a first current-carrying capacity according to the cable model, wherein the first current-carrying capacity is the basic current-carrying capacity of the cable;
configuring a cable coating and coating parameters corresponding to the cable coating in the cable model;
calculating a second current-carrying capacity based on the coating parameter and the first current-carrying capacity, the second current-carrying capacity being a cable current-carrying capacity coated with the cable coating.
Preferably, the building of the cable model includes:
acquiring cable characteristic parameters, wherein the cable characteristic parameters at least comprise cable geometric dimension, cable layered structure parameters and cable material attributes;
and constructing a cable finite element analysis model according to the cable characteristic parameters, and determining the cable finite element analysis model as the cable model.
Preferably, the paint parameters include at least a paint thermal conductivity and a coating thickness, and the calculating the second ampacity based on the paint parameters and the first ampacity includes:
generating different sets of coating parameters according to the coating heat conductivity coefficient and the coating thickness, sequentially inputting the sets of different sets of coating parameters into the cable model, and calculating based on the first current-carrying capacity to obtain a plurality of third current-carrying capacities;
and performing data fitting according to the third current carrying capacity, the heat conductivity coefficient and the coating thickness, and calculating the second current carrying capacity by using the obtained fitting function.
Preferably, after the building of the cable model, the method further includes:
adding a physical field corresponding to a cable operation environment; and
and configuring a current capacity estimation boundary condition.
Preferably, the method further comprises:
triggering the cable model to calculate under the physical field and the boundary condition and output the cable temperature, and drawing a cable temperature field based on the cable temperature, wherein the cable temperature field is used for identifying the temperature corresponding to each layered structure of the cable;
the calculating a first ampacity according to the cable model comprises:
and calculating a first current-carrying capacity based on the cable temperature field and a preset cable temperature threshold value.
Preferably, the adding of the physical field corresponding to the cable work environment includes:
and calling a preset multi-physical-field interface to add the physical field, wherein the multi-physical field at least comprises a magnetic field and solid heat transfer.
Preferably, the method further comprises:
and outputting a recommended coating scheme according to the second current-carrying capacity, wherein the recommended coating scheme at least comprises a fireproof coating mark and a coating thickness.
According to another aspect of the present invention, there is provided an estimation device for cable current-carrying capacity, comprising:
the building module is used for building a cable model;
the calculation module is used for calculating a first current-carrying capacity according to the cable model, wherein the first current-carrying capacity is the basic current-carrying capacity of the cable;
a configuration module for configuring a cable coating and coating parameters corresponding to the cable coating in the cable model;
the calculation module is further configured to calculate a second current-carrying capacity based on the coating parameter and the first current-carrying capacity, the second current-carrying capacity being a cable current-carrying capacity coated with the cable coating.
Preferably, the building block comprises:
the system comprises an acquisition unit, a processing unit and a control unit, wherein the acquisition unit is used for acquiring cable characteristic parameters which at least comprise the geometric dimension of a cable, the parameters of a cable layered structure and the attributes of a cable material;
and the construction unit is used for constructing a cable finite element analysis model according to the cable characteristic parameters and determining the cable finite element analysis model as the cable model.
Preferably, the calculation module includes:
the input unit is used for generating different paint parameter sets according to the paint heat conductivity coefficient and the coating thickness and sequentially inputting the different paint parameter sets into the cable model;
the calculating unit is used for calculating based on the first carrying capacity to obtain a plurality of third carrying capacities;
and the fitting unit is used for fitting data according to the third carrying capacity, the coating heat conductivity coefficient and the coating thickness and calculating the second carrying capacity by using the obtained fitting function.
Preferably, the apparatus further comprises: the adding module is used for adding the data of the mobile phone,
the adding module is used for adding a physical field corresponding to a cable operation environment;
the configuration module is further used for configuring the current capacity estimation boundary condition.
Preferably, the apparatus further comprises: a drawing module for drawing the image of the object,
the drawing module is used for triggering the cable model to calculate under the physical field and the boundary condition and outputting the cable temperature, and drawing a cable temperature field based on the cable temperature, wherein the cable temperature field is used for identifying the temperature corresponding to each layered structure of the cable;
the calculation module is specifically configured to calculate a first current-carrying capacity based on the cable temperature field and a preset cable temperature threshold.
Preferably, the adding module is specifically configured to invoke a preset multi-physical field interface to add the physical field, where the multi-physical field at least includes an electromagnetic field and a solid heat transfer.
Preferably, the apparatus further comprises:
and the output module is used for outputting a recommended coating scheme according to the second current-carrying capacity, wherein the recommended coating scheme at least comprises a fireproof coating mark and a coating thickness.
According to a further aspect of the present invention, there is provided a storage medium having at least one executable instruction stored therein, the executable instruction causing a processor to perform operations corresponding to the method for estimating the current capacity of a cable as described above.
According to still another aspect of the present invention, there is provided a computer apparatus including: the system comprises a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface complete mutual communication through the communication bus;
the memory is used for storing at least one executable instruction, and the executable instruction enables the processor to execute the operation corresponding to the cable current-carrying capacity estimation method.
By the technical scheme, the technical scheme provided by the embodiment of the invention at least has the following advantages:
the invention provides a method and a device for estimating the current-carrying capacity of a cable, which comprises the steps of firstly constructing a cable model and calculating a first current-carrying capacity according to the cable model, wherein the first current-carrying capacity is the basic current-carrying capacity of the cable; secondly, configuring a cable coating and coating parameters corresponding to the cable coating in the cable model; finally, a second ampacity is calculated based on the coating parameter and the first ampacity, and the second ampacity is the cable ampacity coated with the cable coating. Compared with the prior art, the cable current-carrying capacity can be calculated and obtained when the cable is coated with the fireproof coating by constructing the two-dimensional cable simulation model and calculating the basic current-carrying capacity of the cable without the fireproof coating, then adding the corresponding parameters of the cable fireproof coating and the fireproof coating in the model and based on the basic current-carrying capacity, so that the influence of the cable coating fireproof material on the temperature rise inside the cable and the influence of the cable on the current-carrying capacity can be considered when the cable current-carrying capacity is estimated, and the accuracy of estimating the current-carrying capacity of the cable is improved.
The above description is only an overview of the technical solutions of the present invention, and the present invention can be implemented in accordance with the content of the description so as to make the technical means of the present invention more clearly understood, and the above and other objects, features, and advantages of the present invention will be more clearly understood.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 shows a flow chart of a method for estimating current-carrying capacity of a cable according to an embodiment of the present invention;
fig. 2 is a flow chart of another method for estimating the current-carrying capacity of a cable according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a cable structure provided by an embodiment of the invention;
FIG. 4 is a schematic diagram showing another cable temperature field distribution provided by the embodiment of the invention;
fig. 5 is a block diagram illustrating an estimation apparatus for cable current-carrying capacity according to an embodiment of the present invention;
fig. 6 is a block diagram illustrating another apparatus for estimating the current-carrying capacity of a cable according to an embodiment of the present invention;
fig. 7 shows a schematic structural diagram of a computer device according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Aiming at the situation that the existing current-carrying capacity analysis of the cable is mainly based on the internal structure of the cable, the cable material and the like, and other factors influencing the temperature rise of the cable are not considered, so that the existing current-carrying capacity of the cable is not accurate enough, the embodiment of the invention provides a method for estimating the current-carrying capacity of the cable, and as shown in fig. 1, the method comprises the following steps:
101. and constructing a cable model and calculating a first current-carrying capacity according to the cable model.
Wherein the first current-carrying capacity is the basic current-carrying capacity of the cable, that is, the current-carrying capacity of the cable without the fireproof coating. It should be noted that the fireproof coating is coated outside the cable, so that the fireproof effect of the cable can be effectively improved, the heat dissipation of the cable is blocked, and the temperature rise of the cable has certain influence on the current-carrying capacity of the cable. Therefore, when estimating the current carrying capacity of the cable coated with the fireproof coating, the basic current carrying capacity of the cable without the fireproof material can be determined first, so that the current carrying capacity of the cable coated with the fireproof material can be further researched based on the basic current carrying capacity.
The cable model may be a finite element analysis model, or may be any other two-dimensional model capable of performing simulation on a cable, which is not specifically limited in this embodiment of the present application. In the practical application process, parameters related to the actual operation conditions of the cable, such as the internal structure of the cable, the material of the cable, the installation distribution condition between the cables, various environmental parameters contained in the cable operation environment and the like, can be collected in advance, and the parameters are input into a modeling device in the cable current-carrying capacity estimation system to generate a cable model.
102. And configuring a cable coating and coating parameters corresponding to the cable coating in the cable model.
Specifically, a cable coating structure layer can be added to the cable model, such as adding a coating layer at the cable outer sheath layer, setting the coating thickness of the coating layer and the thermal conductivity of the coating, and the like.
103. Calculating a second carrying capacity based on the coating parameter and the first carrying capacity.
Wherein the second current carrying capacity is a cable current carrying capacity coated with the cable coating.
According to the above, after the cable model is built, the coating layer and the coating thickness and the thermal conductivity corresponding to the coating layer may be continuously added to the two-dimensional simulation model, and after the addition is completed, a window may be preset, for example, a "start operation" button is clicked, so as to trigger the cable current-carrying capacity estimation server to calculate based on the current two-dimensional model and input a mathematical model for calculating the cable current-carrying capacity after receiving the instruction, and based on the mathematical model, the cable current-carrying capacity coated with the fireproof coating can be calculated.
The invention provides a method and a device for estimating the current-carrying capacity of a cable, which comprises the steps of firstly constructing a cable model and calculating a first current-carrying capacity according to the cable model, wherein the first current-carrying capacity is the basic current-carrying capacity of the cable; secondly, configuring a cable coating and coating parameters corresponding to the cable coating in the cable model; finally, a second current-carrying capacity is calculated based on the coating parameter and the first current-carrying capacity, the second current-carrying capacity being a cable current-carrying capacity coated with the cable coating. Compared with the prior art, the cable current-carrying capacity can be calculated and obtained when the cable is coated with the fireproof coating by constructing the two-dimensional cable simulation model and calculating the basic current-carrying capacity of the cable without the fireproof coating, then adding the corresponding parameters of the cable fireproof coating and the fireproof coating in the model and based on the basic current-carrying capacity, so that the influence of the cable coating fireproof material on the temperature rise inside the cable and the influence of the cable on the current-carrying capacity can be considered when the cable current-carrying capacity is estimated, and the accuracy of estimating the current-carrying capacity of the cable is improved.
Further, as a refinement and an extension of the above embodiment, in order to fully illustrate a specific implementation process of the above embodiment, another method for estimating a current-carrying capacity of a cable is provided, as shown in fig. 2, the method includes:
201. and constructing a cable model.
The cable model can be a finite element analysis model or any other two-dimensional model capable of carrying out simulation on the cable, and the cable model can contain cable structure, cable material, cable environment and other cable attribute information, and can also contain attribute information associated with the cable, such as other cables in a cluster, a transformation system and the like, and relevant data are input into a modeling device in the cable current-carrying capacity estimation system according to different application scenes so as to construct the cable model.
Specifically, step 201 in the embodiment of the present application may include: acquiring cable characteristic parameters; and constructing a cable finite element analysis model according to the cable characteristic parameters, and determining the cable finite element analysis model as the cable model. The cable characteristic parameters at least comprise the geometric dimension of the cable, the layered structure parameters of the cable and the material properties of the cable.
For example, the parameters of the cable layering structure in the cable model constructed in the embodiment of the present application may be as shown in fig. 3, where the cable is sequentially arranged from inside to outside, and each layering is: the cable comprises a conductor, an inner shielding layer, an insulating layer, an outer shielding layer, a buffer layer, an aluminum sheath and an outer sheath. The geometric dimensions of the cable can include the diameter of the conductor (core), the diameter of the inner shielding layer, the diameter of the insulating layer and the like, and the heat conductivity coefficient of the conductor (core), the heat conductivity coefficient of the inner shielding layer, the heat conductivity coefficient of the outer shielding layer, the heat conductivity coefficient of the buffer layer, the heat conductivity coefficient of the aluminum sheath, the heat conductivity coefficient of the outer sheath and the like.
In order to improve the accuracy of estimating the current-carrying capacity of the cable based on the cable model, the method may further include: adding a physical field corresponding to a cable operation environment; and configuring a ampacity estimation boundary condition. Wherein adding a physical field corresponding to the cable work environment comprises: and calling a preset multi-physical field interface to add the physical field, wherein the multi-physical field at least comprises an electromagnetic field and solid heat transfer.
The term "field" refers to the distribution of objects in space, objects in the field are governed by the law of physical field, and the distribution and change law of the object under study in space can be known by the value of each corresponding physical quantity in space under the action of each field. In the embodiment of the present application, since the space where the current carrying capacity of the cable is located is affected by the two physical fields of the electromagnetic field and the solid heat transfer, the two physical fields are added in this step to construct a more accurate cable model. Specifically, in the embodiment of the present application, an interface may be called through a preset plurality of physical fields, and a corresponding physical field may be configured in the simulation model according to actual requirements.
Further, the embodiment of the present application may further include: and triggering the cable model to calculate under the physical field and the boundary condition and output the cable temperature, and drawing a cable temperature field based on the cable temperature.
Wherein the cable temperature field is used to identify the temperature corresponding to each layered structure of the cable. In an embodiment of the present application, the boundary conditions set may be to define a conductor domain in the inner conductor portion of the cable and configure the current and resistivity corresponding to the conductor domain a priori while setting a temperature boundary condition at the solid heat transfer interface.
In addition, because cable body structure is accurate, consequently when carrying out cable current-carrying capacity estimation according to the cable model, need meticulous subdivision in order to satisfy the computational requirement of higher accuracy, and then promote the accuracy nature that cable current-carrying capacity estimated. In the embodiment of the application, a mesh subdivision form is adopted, the mesh is set to be a physical field control network, the size of a unit is refined, the mesh can be set to be a sequence type and a unit size according to different application requirements, and for example, a mesh subdivision diagram can be shown in fig. 4.
Further, in the embodiment of the present application, when the current-carrying capacity of the cable is calculated according to the cable model, a research type may also be set, and specifically, the research type is set as a frequency domain-steady state research type. Since the cable is operated for a long time, it needs to be set in a "steady state" type for analysis and calculation in order to estimate its temperature distribution and current-carrying capacity in a steady operation state. And since the alternating current flowing in the cable has a certain frequency, typically 50Hz, the study type of the cable model is set as a frequency domain-steady state study type in the embodiment of the present application. After the setting is finished, finite element calculation can be carried out according to the cable model, and a calculation result is output, so that a cable temperature field is drawn. And solving the cable geometric model configured with the boundary conditions to obtain a cable temperature field capable of identifying the temperature distribution condition of the cable core.
202. And calculating a first current-carrying capacity according to the cable model.
Wherein the first current-carrying capacity is the basic current-carrying capacity of the cable, namely the current-carrying capacity of the cable without the fireproof coating. It should be noted that, the fireproof coating is coated outside the cable, so that the fireproof effect of the cable can be effectively improved, the dissipation of the heat of the cable is blocked, and the temperature rise of the cable has certain influence on the current-carrying capacity of the cable. Therefore, when estimating the current carrying capacity of the cable coated with the fireproof coating, the basic current carrying capacity of the cable without the fireproof material can be determined first, so as to further study the current carrying capacity of the cable coated with the fireproof material based on the basic current carrying capacity.
In the embodiment of the present application, step 202 may specifically include: and calculating a first current-carrying capacity based on the cable temperature field and a preset cable temperature threshold value.
The temperature threshold of the cable may be set according to different application scenarios, for example, the temperature threshold is set to 90 ℃. In a specific implementation process, whether the current-carrying capacity of the cable is adjustable may be determined based on a priori conditions, and if it is determined that the current-carrying capacity of the cable may be appropriately increased, the current-carrying capacity of the cable may be adjusted slightly multiple times, so that the temperature of the cable approaches the temperature threshold, and the current-carrying capacity of the cable when the temperature of the cable satisfies the preset condition is determined as the first current-carrying capacity described in this step, which is only an example, and the specific embodiment is not limited thereto.
In the embodiment of the application, the basic current-carrying capacity of the cable without the fireproof coating is determined based on the cable model, preset research conditions and the like, so that the current-carrying capacity of the cable coated with the fireproof coating is determined by the influence of the coated fireproof coating on the current-carrying capacity of the cable, data processing capacity is reduced to the maximum extent during estimation of the current-carrying capacity of the cable, and accuracy of estimation of the current-carrying capacity is improved.
203. And configuring a cable coating and coating parameters corresponding to the cable coating in the cable model.
The conceptual explanation of the coating parameters and the specific implementation of this step can be referred to the corresponding description in step 102, and this is not repeated in this application.
204. And generating different sets of coating parameters according to the coating heat conductivity coefficient and the coating thickness, sequentially inputting the sets of coating parameters into the cable model, and calculating based on the first current-carrying capacity to obtain a plurality of third current-carrying capacities.
Different fireproof coatings have different heat conductivity coefficients, and the influence of the same fireproof coating on the current-carrying capacity of the cable is different when the coating thickness is different, so that in the implementation process, different fireproof coating parameters input into a cable model need to be adjusted after the basic current-carrying capacity is obtained through calculation, namely for the fireproof coating with the heat conductivity coefficient of M, the coating thickness of h can be sequentially calculated 1 、h 2 ……h i The third load flow of the cable, and the coating thickness h of the same fireproof coating, when the thermal conductivity coefficients are respectively M 1 、M 2 ……M n When the fireproof coating is coated on the cable, the third carrying capacity of the cable is obtained by respectively inputting a large number of different coating parameter combinations into the cable model, and the cable carrying capacity estimation server can calculate based on the cable basic carrying capacity and finally obtain a plurality of groups of carrying capacity test data so as to facilitate the test data according to the carrying capacityThe relation between the coating parameters for applying the fireproof coating and the carrying capacity is further determined.
205. And performing data fitting according to the third carrying capacity, the coating heat conductivity coefficient and the coating thickness, and calculating the second carrying capacity by using the obtained fitting function.
Wherein the second ampacity is a cable ampacity coated with the cable coating. And establishing a mathematical model according to the calculated carrying capacity test data and by combining key parameters such as the heat conductivity coefficient of the fireproof coating, the coating thickness and the like, so as to obtain the cable carrying capacity of the fireproof coating under coating.
Specifically, the second ampacity may be expressed as:
y＝984-0.029r 2.51 x, wherein y represents the current carrying capacity of the cable and has the unit of A; r represents a thermal conductivity coefficient in W/(m.K); x represents the coating thickness in mm.
In the embodiment of the application, after the cable simulation model is built, after the cable related attribute information, the fireproof coating and the coating parameters are added into the simulation model, a physical field and boundary conditions are configured for the cable model, so that the cable current-carrying capacity estimation server can calculate the cable basic current-carrying capacity of the non-coated fireproof material, data fitting is carried out on the basis of the basic current-carrying capacity, different coating heat conductivity coefficients and different coating thicknesses, and finally the relation between the cable current-carrying capacity coated with the fireproof coating, the heat conductivity coefficient of the fireproof coating and the coating thickness is obtained.
206. Outputting a recommended coating scheme according to the second ampacity.
Wherein, the recommended coating scheme at least comprises a fireproof coating mark and a coating thickness.
According to the embodiment of the application, the mathematical relation between the cable current-carrying capacity of the coated fireproof coating and the thermal conductivity and coating thickness of the coating can be established, so that in specific application, a corresponding coating scheme can be output according to different operation requirements, for example, if a cable covered by the fireproof coating with a certain thermal conductivity coefficient of R is known and the coating thickness of the fireproof coating outside the cable is X, the maximum current-carrying capacity which can be borne by the cable on the premise of ensuring the safe operation of the cable can be calculated.
The invention provides a method and a device for estimating the current-carrying capacity of a cable, which comprises the steps of firstly constructing a cable model and calculating a first current-carrying capacity according to the cable model, wherein the first current-carrying capacity is the basic current-carrying capacity of the cable; secondly, configuring a cable coating and coating parameters corresponding to the cable coating in the cable model; finally, a second ampacity is calculated based on the coating parameter and the first ampacity, and the second ampacity is the cable ampacity coated with the cable coating. Compared with the prior art, the cable current-carrying capacity estimation method and the cable current-carrying capacity estimation device have the advantages that the cable two-dimensional simulation model is built, the cable basic current-carrying capacity without the fireproof coating is calculated, then the corresponding parameters of the cable fireproof coating and the fireproof coating are added into the model, and the cable current-carrying capacity when the cable is coated with the fireproof coating can be calculated and obtained based on the basic current-carrying capacity, so that the influence of the cable coating fireproof material on the temperature rise inside the cable and the influence of the cable current-carrying capacity can be considered when the cable current-carrying capacity is estimated, and the accuracy of cable current-carrying capacity estimation is improved.
Further, as a specific implementation of the method shown in fig. 1 and fig. 2, the present embodiment provides an apparatus for estimating a current-carrying capacity of a cable, as shown in fig. 5, the apparatus includes: a building module 31, a calculation module 32, a configuration module 33.
A building module 31 for building a cable model;
a calculating module 32, configured to calculate a first ampacity according to the cable model, where the first ampacity is a basic ampacity of a cable;
a configuration module 33 for configuring a cable coating and coating parameters corresponding to the cable coating in the cable model;
the calculating module 32 is further configured to calculate a second current-carrying capacity based on the coating parameter and the first current-carrying capacity, where the second current-carrying capacity is a cable current-carrying capacity coated with the cable coating.
In a specific application scenario, as shown in fig. 6, the building module 31 includes:
an obtaining unit 311, configured to obtain cable characteristic parameters, where the cable characteristic parameters at least include a cable geometric size, a cable layered structure parameter, and a cable material attribute;
the constructing unit 312 is configured to construct a cable finite element analysis model according to the cable characteristic parameters, and determine the cable finite element analysis model as the cable model.
In a specific application scenario, as shown in fig. 6, the calculating module 32 includes:
an input unit 321, configured to generate different sets of coating parameters according to the coating thermal conductivity and the coating thickness, and sequentially input the sets of different sets of coating parameters into the cable model;
a calculating unit 322, configured to calculate based on the first ampacity, to obtain a plurality of third ampacity;
and the fitting unit 323 is used for performing data fitting according to the third carrying capacity, the heat conductivity coefficient and the coating thickness, and calculating the second carrying capacity by using the obtained fitting function.
In a specific application scenario, as shown in fig. 6, the apparatus further includes: the addition module (34) is used for adding,
the adding module 34 is configured to add a physical field corresponding to a cable operating environment;
the configuration module 33 is further configured to configure a boundary condition for current capacity estimation.
In a specific application scenario, as shown in fig. 6, the apparatus further includes: the drawing module (35) is used for drawing,
the drawing module 35 is configured to trigger the cable model to calculate and output a cable temperature under the physical field and the boundary condition, and draw a cable temperature field based on the cable temperature, where the cable temperature field is used to identify a temperature corresponding to each hierarchical structure of the cable;
the calculating module 32 is specifically configured to calculate the first ampacity based on the cable temperature field and a preset cable temperature threshold.
In a specific application scenario, as shown in figure 6,
the adding module 34 is specifically configured to invoke a preset multi-physical field interface to add the physical field, where the multi-physical field includes at least an electromagnetic field and a solid heat transfer.
In a specific application scenario, as shown in fig. 6, the apparatus further includes:
and an output module 36, configured to output a recommended coating scheme according to the second current-carrying capacity, where the recommended coating scheme at least includes a fire retardant coating identifier and a coating thickness.
The invention provides an estimation device of cable current-carrying capacity, which comprises the steps of firstly constructing a cable model and calculating first current-carrying capacity according to the cable model, wherein the first current-carrying capacity is the basic current-carrying capacity of a cable; secondly, configuring a cable coating and coating parameters corresponding to the cable coating in the cable model; finally, a second ampacity is calculated based on the coating parameter and the first ampacity, and the second ampacity is the cable ampacity coated with the cable coating. Compared with the prior art, the cable current-carrying capacity estimation method and the cable current-carrying capacity estimation device have the advantages that the cable two-dimensional simulation model is built, the cable basic current-carrying capacity without the fireproof coating is calculated, then the corresponding parameters of the cable fireproof coating and the fireproof coating are added into the model, and the cable current-carrying capacity when the cable is coated with the fireproof coating can be calculated and obtained based on the basic current-carrying capacity, so that the influence of the cable coating fireproof material on the temperature rise inside the cable and the influence of the cable current-carrying capacity can be considered when the cable current-carrying capacity is estimated, and the accuracy of cable current-carrying capacity estimation is improved.
According to an embodiment of the present invention, there is provided a storage medium storing at least one executable instruction, where the computer executable instruction is capable of executing the method for estimating the current capacity of the cable in any of the method embodiments described above.
Fig. 7 is a schematic structural diagram of a computer device according to an embodiment of the present invention, and the specific embodiment of the present invention does not limit the specific implementation of the computer device.
As shown in fig. 7, the computer apparatus may include: a Processor (Processor) 402, a Communications Interface 404, memory 406, and a Communications bus 408.
Wherein: the processor 402, communication interface 404, and memory 406 communicate with each other via a communication bus 408.
A communication interface 404 for communicating with network elements of other devices, such as clients or other servers.
The processor 402 is configured to execute the program 410, and may specifically execute the relevant steps in the above-described embodiment of the method for estimating the current capacity of the cable.
In particular, program 410 may include program code comprising computer operating instructions.
The processor 402 may be a central processing unit CPU, or an Application Specific Integrated Circuit ASIC (Application Specific Integrated Circuit), or one or more Integrated circuits configured to implement an embodiment of the present invention. The computer device includes one or more processors, which may be the same type of processor, such as one or more CPUs; or may be different types of processors such as one or more CPUs and one or more ASICs.
A memory 406 for storing a program 410. The Memory 406 may comprise high-speed RAM Memory, and may also include Non-volatile Memory (Non-volatile Memory), such as at least one disk Memory.
The program 410 may be specifically configured to cause the processor 402 to perform the following operations:
constructing a cable model and calculating a first current-carrying capacity according to the cable model, wherein the first current-carrying capacity is the basic current-carrying capacity of the cable;
configuring a cable coating and a coating parameter corresponding to the cable coating in the cable model;
calculating a second current-carrying capacity based on the coating parameter and the first current-carrying capacity, the second current-carrying capacity being a cable current-carrying capacity coated with the cable coating.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized in a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a memory device and executed by a computing device, and in some cases, the steps shown or described may be executed out of order, or separately as individual integrated circuit modules, or multiple modules or steps thereof may be implemented as a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. A method for estimating the ampacity of a cable, comprising:
constructing a cable model and calculating a first current-carrying capacity according to the cable model, wherein the first current-carrying capacity is the basic current-carrying capacity of the cable;
configuring a cable coating and a coating parameter corresponding to the cable coating in the cable model;
calculating a second current-carrying capacity based on the coating parameter and the first current-carrying capacity, the second current-carrying capacity being a cable current-carrying capacity coated with the cable coating.
2. The method of claim 1, wherein the building a cable model comprises:
acquiring cable characteristic parameters, wherein the cable characteristic parameters at least comprise cable geometric dimension, cable layered structure parameters and cable material attributes;
and constructing a cable finite element analysis model according to the cable characteristic parameters, and determining the cable finite element analysis model as the cable model.
3. The method of claim 1, wherein the coating parameters include at least a coating thermal conductivity and a coating thickness, and wherein calculating the second current-carrying capacity based on the coating parameters and the first current-carrying capacity comprises:
generating different sets of coating parameters according to the coating heat conductivity coefficient and the coating thickness, sequentially inputting the sets of different sets of coating parameters into the cable model, and calculating based on the first current-carrying capacity to obtain a plurality of third current-carrying capacities;
and performing data fitting according to the third carrying capacity, the coating heat conductivity coefficient and the coating thickness, and calculating the second carrying capacity by using the obtained fitting function.
4. The method according to claim 1 or 2, wherein after the building of the cable model, the method further comprises:
adding a physical field corresponding to a cable operation environment; and
and configuring a current capacity estimation boundary condition.
5. The method of claim 4, further comprising:
triggering the cable model to calculate under the physical field and the boundary condition and output the cable temperature, and drawing a cable temperature field based on the cable temperature, wherein the cable temperature field is used for identifying the temperature corresponding to each layered structure of the cable;
the calculating a first ampacity according to the cable model comprises:
and calculating a first current-carrying capacity based on the cable temperature field and a preset cable temperature threshold value.
6. The method of claim 4, wherein the adding a physical field corresponding to a cable work environment comprises:
and calling a preset multi-physical field interface to add the physical field, wherein the multi-physical field at least comprises an electromagnetic field and solid heat transfer.
7. The method of claim 3, further comprising:
and outputting a recommended coating scheme according to the second current-carrying capacity, wherein the recommended coating scheme at least comprises a fireproof coating mark and a coating thickness.
8. An apparatus for estimating the ampacity of a cable, comprising:
the building module is used for building a cable model;
the calculation module is used for calculating a first current-carrying capacity according to the cable model, wherein the first current-carrying capacity is the basic current-carrying capacity of the cable;
a configuration module for configuring a cable coating and coating parameters corresponding to the cable coating in the cable model;
the calculation module is further configured to calculate a second ampacity based on the coating parameter and the first ampacity, where the second ampacity is a cable ampacity coated with the cable coating.
9. A storage medium having stored therein at least one executable instruction for causing a processor to perform operations corresponding to the method for estimating current capacity of a cable according to any one of claims 1 to 7.
10. A computer device, comprising: the system comprises a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface complete mutual communication through the communication bus;
the memory is used for storing at least one executable instruction, and the executable instruction causes the processor to execute the operation corresponding to the cable current-carrying capacity estimation method according to any one of claims 1-7.
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