CN117725777A - Cable temperature field determining method, device, computer equipment and storage medium - Google Patents
Cable temperature field determining method, device, computer equipment and storage medium Download PDFInfo
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Abstract
The application relates to a cable temperature field determining method, a device, computer equipment and a storage medium, which belong to the technical field of power transmission equipment, and the method comprises the following steps: in response to a temperature field determination request for a target cable, a current surface temperature of the target cable is obtained. And inputting the current surface temperature of the target cable into a thermal network topology model of the target cable to obtain the current cable conductor current of the target cable. Inputting the current cable conductor current into a target temperature field analysis model of the target cable to obtain a current temperature field of the target cable; the target temperature field analysis model is obtained by processing a cable structure of the target cable. According to the method, the thermal network topology model is adopted, the current cable conductor current can be determined based on the current surface temperature of the target cable, and then the current cable conductor current is input into the target temperature field analysis model of the target cable, so that the temperature of the cable conductor of the target cable can be accurately obtained, and the current temperature field of the target cable can be obtained.
Description
Technical Field
The present disclosure relates to the field of power transmission devices, and in particular, to a method and apparatus for determining a cable temperature field, a computer device, and a storage medium.
Background
With the continuous improvement of urban construction level, the power cable gradually replaces overhead lines to become important power transmission equipment of a main network and a distribution network in a power system.
When the cable internally carries current, the conductor generates joule heat based on ohm's law and causes the cable body and surrounding environment to rise in temperature. Taking a crosslinked polyethylene cable as an example, when the temperature of a cable conductor exceeds 90 ℃, the service life of cable insulation is reduced by half, so that the temperature of the cable conductor in the national standard also reaches 90 ℃ as a threshold value of the current-carrying capacity (the maximum power frequency current allowed to flow in the cable conductor for a long time) of the cable.
However, due to the special structure of the cable, no effective method for acquiring the temperature of the cable conductor exists at present, and no effective measure for acquiring the temperature field of the cable exists.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a cable temperature field determination method, apparatus, computer device, and storage medium that can accurately determine a cable temperature field.
In a first aspect, the present application provides a method of determining a cable temperature field. The method comprises the following steps:
acquiring a current surface temperature of the target cable in response to a temperature field determination request for the target cable;
inputting the current surface temperature of the target cable into a thermal network topology model of the target cable to obtain the current cable conductor current of the target cable; the thermal network topology model is obtained by processing material information and environmental parameters of a target cable;
inputting the current cable conductor current into a target temperature field analysis model of the target cable to obtain a current temperature field of the target cable; the target temperature field analysis model is obtained by processing a cable structure of the target cable.
In one embodiment, the material information includes material layers and layer parameters of the material layers, and processing the material information and environmental parameters of the target cable includes:
determining the material thermal resistance and the material heat capacity of each material layer in the target cable according to each material layer and the layer parameters of each material layer; wherein the layer parameters include thermal resistivity and specific heat capacity;
according to the environmental parameters of the target cable, determining the environmental thermal resistance and the environmental heat capacity of the target cable; wherein the environmental parameters include at least one of air humidity, soil moisture content, wind speed, and ambient temperature;
And constructing a thermal network topology model of the target cable according to the environmental thermal resistance and the environmental heat capacity, and the material thermal resistance and the material heat capacity of each material layer.
In one embodiment, processing a cable structure of a target cable includes:
constructing a physical simulation model of the target cable according to the cable structure of the target cable;
based on finite element analysis software, a target temperature field analysis model of the target cable is constructed according to the physical simulation model.
In one embodiment, based on finite element analysis software, constructing a target temperature field analysis model of a target cable according to a physical simulation model, includes:
importing the physical simulation model into finite element analysis software to obtain a primary temperature field analysis model of the target cable;
configuring constraint conditions for the primary temperature field analysis model, and constructing a target temperature field analysis model of the target cable based on the primary temperature field analysis model after the constraint conditions are configured; wherein the constraint conditions include an environmental condition and a boundary condition of the target cable; boundary conditions include convective heat transfer coefficients.
In one embodiment, constructing a target temperature field analysis model of the target cable based on the initial temperature field analysis model after the constraint condition is configured includes:
Performing grid division on the initial temperature field analysis model after constraint conditions are configured to obtain candidate temperature field analysis models of the target cable;
inputting the test cable conductor current corresponding to the test surface temperature of the target cable into a candidate temperature field analysis model to obtain a test temperature field of the target cable;
determining a temperature difference between a predicted surface temperature corresponding to the test temperature field and the test surface temperature;
judging whether the temperature difference is smaller than a difference threshold;
if yes, the candidate temperature field analysis model is used as a target temperature field analysis model of the target cable.
In one embodiment, the method further comprises:
and if the temperature difference is not smaller than the difference threshold, adjusting boundary conditions according to a preset step length to update the candidate temperature field analysis model, and based on the updated candidate temperature field analysis model, returning to execute the test cable conductor current corresponding to the test surface temperature of the target cable, and inputting the test cable conductor current into the candidate temperature field analysis model to obtain the test temperature field of the target cable.
In a second aspect, the present application also provides a cable temperature field determination apparatus. The device comprises:
an acquisition module for acquiring a current surface temperature of the target cable in response to a temperature field determination request for the target cable;
The first determining module is used for inputting the current surface temperature of the target cable into the thermal network topology model of the target cable to obtain the current cable conductor current of the target cable; the thermal network topology model is obtained by processing material information and environmental parameters of a target cable;
the second determining module is used for inputting the current cable conductor current to a target temperature field analysis model of the target cable to obtain the current temperature field of the target cable; the target temperature field analysis model is obtained by processing a cable structure of the target cable.
In a third aspect, the present application also provides a computer device. The computer device comprises a memory storing a computer program and a processor which when executing the computer program performs the steps of:
acquiring a current surface temperature of the target cable in response to a temperature field determination request for the target cable;
inputting the current surface temperature of the target cable into a thermal network topology model of the target cable to obtain the current cable conductor current of the target cable; the thermal network topology model is obtained by processing material information and environmental parameters of a target cable;
Inputting the current cable conductor current into a target temperature field analysis model of the target cable to obtain a current temperature field of the target cable; the target temperature field analysis model is obtained by processing a cable structure of the target cable.
In a fourth aspect, the present application also provides a computer-readable storage medium. A computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:
acquiring a current surface temperature of the target cable in response to a temperature field determination request for the target cable;
inputting the current surface temperature of the target cable into a thermal network topology model of the target cable to obtain the current cable conductor current of the target cable; the thermal network topology model is obtained by processing material information and environmental parameters of a target cable;
inputting the current cable conductor current into a target temperature field analysis model of the target cable to obtain a current temperature field of the target cable; the target temperature field analysis model is obtained by processing a cable structure of the target cable.
In a fifth aspect, the present application also provides a computer program product. Computer program product comprising a computer program which, when executed by a processor, realizes the steps of:
Acquiring a current surface temperature of the target cable in response to a temperature field determination request for the target cable;
inputting the current surface temperature of the target cable into a thermal network topology model of the target cable to obtain the current cable conductor current of the target cable; the thermal network topology model is obtained by processing material information and environmental parameters of a target cable;
inputting the current cable conductor current into a target temperature field analysis model of the target cable to obtain a current temperature field of the target cable; the target temperature field analysis model is obtained by processing a cable structure of the target cable.
The above cable temperature field determination method, apparatus, computer device, and storage medium acquire a current surface temperature of a target cable in response to a temperature field determination request for the target cable. And inputting the current surface temperature of the target cable into a thermal network topology model of the target cable to obtain the current cable conductor current of the target cable. Inputting the current cable conductor current into a target temperature field analysis model of the target cable to obtain a current temperature field of the target cable; the target temperature field analysis model is obtained by processing a cable structure of the target cable. According to the method, the thermal network topology model is adopted, the current cable conductor current can be determined based on the current surface temperature of the target cable, and then the current cable conductor current is input into the target temperature field analysis model of the target cable, so that the temperature of the cable conductor of the target cable can be accurately obtained, and the current temperature field of the target cable can be obtained.
Drawings
Fig. 1 is an application environment diagram of a cable temperature field determining method provided in the present embodiment;
fig. 2 is a flow chart of a first cable temperature field determining method according to the present embodiment;
fig. 3 is a schematic flow chart of a thermal network topology model for constructing a target cable according to the present embodiment;
fig. 4 is a schematic structural diagram of a thermal network topology of a target cable according to the present embodiment;
fig. 5 is a schematic flow chart of a target temperature field analysis model for constructing a target cable according to the present embodiment;
fig. 6 is a flow chart of a second method for determining a cable temperature field according to the present embodiment;
fig. 7 is a block diagram of a cable temperature field determining device according to the present embodiment;
fig. 8 is an internal structural diagram of the computer device provided in the present embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The cable temperature field determining method provided by the embodiment of the application can be applied to an application environment shown in fig. 1. Wherein the server 104 obtains the current surface temperature of the target cable by the detection device 102 in response to a temperature field determination request for the target cable. The server 104 inputs the current surface temperature of the target cable to the thermal network topology model of the target cable to obtain the current cable conductor current of the target cable. The thermal network topology model is obtained by processing material information and environmental parameters of the target cable. The server 104 inputs the present cable conductor current to the target temperature field analysis model of the target cable to obtain the present temperature field of the target cable. The target temperature field analysis model is obtained by processing a cable structure of the target cable.
The server 104 may be implemented as a stand-alone server or a server cluster including a plurality of servers. The detection device 102 is a temperature detection means, such as a temperature sensor or thermocouple.
In one embodiment, as shown in fig. 2, a cable temperature field determining method is provided, and the method is applied to the server in fig. 1 for illustration, and includes the following steps:
s201, in response to a temperature field determination request for a target cable, a current surface temperature of the target cable is acquired.
The target cable refers to a cable needing to determine a temperature field. The temperature field determination request refers to a request transmitted to the server when there is a temperature field determination requirement for the target cable. The current surface temperature refers to the current surface temperature information of the target cable.
An alternative implementation manner of this embodiment is as follows: and responding to a temperature field determining request aiming at the target cable, sending a temperature acquisition request to the detection equipment so as to enable the detection equipment to feed back the current surface temperature of the target cable, and further obtaining the current surface temperature of the target cable.
Another alternative implementation of this embodiment is: in response to a temperature field determination request for the target cable, a current surface temperature of the target cable is retrieved from a temperature detection database. Wherein the temperature monitoring database stores the current surface temperature of the target cable.
S202, inputting the current surface temperature of the target cable into a thermal network topology model of the target cable to obtain the current cable conductor current of the target cable. The thermal network topology model is obtained by processing material information and environmental parameters of the target cable.
The thermal network topology model is constructed based on material information and environmental parameters of the target cable to obtain the topology model. The mathematical expression of the thermal network topology model is t=f (I) or i=f (T), where T is the surface temperature of the target cable and I is the cable conductor current of the target cable. The functions to be realized based on the thermal network topology model are as follows: the cable conductor current of the target cable is determined by the surface temperature of the target cable. The present cable conductor current refers to the present current value of the target cable inner conductor. The material information mainly comprises each material layer of the target cable and layer parameters corresponding to each material layer. The environmental parameter refers to information of the environment to which the target cable belongs.
Optionally, in this embodiment, the current surface temperature of the target cable is preprocessed, and the preprocessed current surface temperature is input into the thermal network topology model of the target cable, so as to obtain the current cable conductor current of the target cable. The pretreatment modes comprise cleaning, correction and form conversion. It should be noted that the current surface temperature may include surface temperatures of multiple locations (i.e., different locations) of the target cable, and the current surface temperature may be converted into a temperature matrix by using form conversion, where the temperature matrix is used as an input parameter of the thermal network topology model.
Optionally, in this embodiment, a communication interface between the thermal network topology model and the temperature monitoring database may be configured, so that when a temperature field determination requirement is met, the thermal network topology model may directly obtain the current surface temperature of the target cable from the temperature monitoring database.
S203, inputting the current cable conductor current into a target temperature field analysis model of the target cable to obtain the current temperature field of the target cable. The target temperature field analysis model is obtained by processing a cable structure of the target cable.
The target temperature field analysis model is a finite element analysis model which is constructed based on the cable structure of the target cable and is used for analyzing the temperature field of the target cable. The current temperature field refers to current global temperature distribution data of the target cable, and not only includes cable conductor temperature data of the target cable.
An alternative implementation manner of this embodiment is as follows: and acquiring the determined current cable conductor current for the target cable from the thermal network topology model, and inputting the current cable conductor current into a target temperature field analysis model of the target cable to obtain the current temperature field of the target cable.
Another alternative implementation of this embodiment is: and constructing a communication interface of the thermal network topology model and the target temperature field analysis model, so that the thermal network topology model determines the current cable conductor current of the target cable, directly inputs the current cable conductor current into the target temperature field analysis model of the target cable, and further obtains the current temperature field of the target cable through the target temperature field analysis model. Specifically, the processing software (for example, MATLAB software) is adopted to carry out coding processing on the thermal network topology model, and a communication interface between the processing software and the software where the target temperature field analysis model is located is established, so that the current cable conductor current of the target cable, which is obtained by processing the thermal network topology model, can be directly input into the target temperature field analysis model, and the current temperature field of the target cable can be obtained more quickly.
The above-described cable temperature field determination method acquires a current surface temperature of a target cable in response to a temperature field determination request for the target cable. And inputting the current surface temperature of the target cable into a thermal network topology model of the target cable to obtain the current cable conductor current of the target cable. Inputting the current cable conductor current into a target temperature field analysis model of the target cable to obtain a current temperature field of the target cable; the target temperature field analysis model is obtained by processing a cable structure of the target cable. According to the method, the thermal network topology model is adopted, the current cable conductor current can be determined based on the current surface temperature of the target cable, and then the current cable conductor current is input into the target temperature field analysis model of the target cable, so that the temperature of the cable conductor of the target cable can be accurately obtained, and the current temperature field of the target cable can be obtained.
In one embodiment, in order to make the cable conductor current of the target cable determined by the thermal network topology model more accurate, as shown in fig. 3, an optional implementation of processing the material information and the environmental parameters of the target cable in S202 includes:
S301, determining the material thermal resistance and the material heat capacity of each material layer in the target cable according to each material layer and the layer parameters of each material layer. Wherein the layer parameters include thermal resistivity and specific heat capacity.
The material layer refers to each layer structure of the target cable, for example, the material layer sequentially comprises a cable conductor, a conductor shielding layer, an insulating shielding layer, a water blocking tape layer, an aluminum protective layer and an outer protective layer (namely an outer sheath) from inside to outside. Layer parameters mainly include thermal resistivity and specific heat capacity of each layer. The thermal resistance of a material refers to the value of how hard the material is to transfer heat. The heat capacity of a material refers to the ratio of the heat exchanged between the material and the environment to the temperature change caused thereby, referred to as the heat capacity of the material.
Alternatively, in this embodiment, the thermal resistance and the thermal capacity of each material layer in the target cable may be determined according to the thermal resistance and the specific heat capacity of each material layer by a calculation formula in the IEC (International Electrotechnical Commission ) 60287 standard.
S302, determining the environmental thermal resistance and the environmental heat capacity of the target cable according to the environmental parameters of the target cable. Wherein the environmental parameter includes at least one of air humidity, soil moisture content, wind speed, and ambient temperature.
The environmental parameters refer to index parameters with larger relevance to thermal resistance and thermal resistance, and mainly comprise at least one of air humidity, soil water content, wind speed and environmental temperature.
Optionally, in this embodiment, according to the environmental parameter of the target cable, the calculation formula in the IEC 60853 standard is combined to determine the environmental thermal resistance and the environmental heat capacity of the target cable.
S303, constructing a thermal network topology model of the target cable according to the environmental thermal resistance and the environmental heat capacity, and the material thermal resistance and the material heat capacity of each material layer.
Optionally, in this embodiment, a thermal network mathematical expression and a thermal network topology structure are constructed according to the environmental thermal resistance and the environmental heat capacity, and the material thermal resistance and the material heat capacity of each material layer, and a thermal network topology model of the target cable is constructed according to the thermal network mathematical expression and the thermal network topology structure.
The input parameter of the thermal network mathematical expression in this embodiment is the current surface temperature (for example, a temperature matrix), the weight coefficient (for example, a coefficient matrix) forming the thermal network mathematical expression is constructed according to the environmental thermal resistance and the environmental heat capacity, and the material thermal resistance and the material heat capacity of each material layer, the output parameter of the thermal network mathematical expression is the cable conductor current (for example, a conductor current matrix) of the target cable, and the thermal network mathematical expression is constructed based on the input parameter, the weight coefficient and the output parameter.
In this embodiment, the hot network topology is shown in fig. 4, and T in fig. 4 1 、T 2 、T 3 、T 4 Respectively represent the surface temperatures of different positions of the target cable, R 1 、R 2 、R 3 Respectively represent the thermal resistance of each material layer and the environment, P 1 、P 2 、P 3 The heat capacity of each material layer and the environment are shown separately, and the power supply identifier in fig. 4 indicates the loss.
In this embodiment, according to each material layer and layer parameters of each material layer, a material thermal resistance and a material heat capacity of each material layer in the target cable are determined. Wherein the layer parameters include thermal resistivity and specific heat capacity. According to the environmental parameters of the target cable, determining the environmental thermal resistance and the environmental heat capacity of the target cable; wherein the environmental parameter includes at least one of air humidity, soil moisture content, and wind speed. According to the environmental thermal resistance and the environmental heat capacity, and the material thermal resistance and the material heat capacity of each material layer, a thermal network topology model of the target cable can be constructed more accurately, and the cable conductor current of the target cable can be determined by the thermal network topology model more accurately.
In one embodiment, in order to accurately construct the target temperature field analysis model, so that the determined temperature field of the target cable is more accurate, as shown in fig. 4, an alternative implementation manner of processing the cable structure of the target cable in S203 in the foregoing embodiment includes:
S501, constructing a physical simulation model of the target cable according to the cable structure of the target cable.
The cable structure refers to a geometric structure of a cable and sequentially comprises a cable conductor, a conductor shield, an insulating layer, an insulating shield, a water blocking belt, an aluminum protective layer, an outer sheath and the like from inside to outside. The physical simulation model is based on the cable structure of the target cable, and the constructed simulation model corresponds to the target cable.
Optionally, in this embodiment, according to the cable structure of the target cable, the physical simulation model of the target cable may be constructed by combining with model construction software. The model building software adopts, but is not limited to, SOLIWORK, UG and other model building software.
S502, constructing a target temperature field analysis model of the target cable according to the physical simulation model based on finite element analysis software.
The finite element analysis software may be, but is not limited to, COMSOL analysis software.
Optionally, in this embodiment, the physical simulation model is imported into finite element analysis software to obtain a primary temperature field analysis model of the target cable. And configuring constraint conditions for the primary temperature field analysis model, and constructing a target temperature field analysis model of the target cable based on the primary temperature field analysis model after the constraint conditions are configured. Wherein the constraint conditions include an environmental condition and a boundary condition of the target cable; boundary conditions include at least convective heat transfer coefficients; environmental conditions include mainly the environment, such as soil, tunnels or exposure to air.
Based on the initial temperature field analysis model after the constraint condition is configured, an optional implementation mode for constructing the target temperature field analysis model of the target cable is as follows:
and performing grid division (for example, adopting tetrahedral grid division) on the initial temperature field analysis model after the constraint condition is configured to obtain candidate temperature field analysis models of the target cable. Inputting the test cable conductor current corresponding to the test surface temperature of the target cable into a candidate temperature field analysis model to obtain a test temperature field of the target cable; determining a temperature difference between a predicted surface temperature corresponding to the test temperature field and the test surface temperature; judging whether the temperature difference is smaller than a difference threshold; if yes, the candidate temperature field analysis model is used as a target temperature field analysis model of the target cable. If the temperature difference is not less than the difference threshold (for example, 0.1K), according to the preset step length, adjusting the boundary condition to update the candidate temperature field analysis model, and based on the updated candidate temperature field analysis model, returning to execute the test cable conductor current corresponding to the test surface temperature of the target cable, inputting the test cable conductor current into the candidate temperature field analysis model to obtain the test temperature field of the target cable, and sequentially iterating until the temperature difference is less than the difference threshold to obtain the target temperature field analysis model.
In this embodiment, a physical simulation model of the target cable is constructed according to the cable structure of the target cable, and the physical simulation model is imported into finite element analysis software to obtain a primary temperature field analysis model of the target cable. And configuring constraint conditions for the primary temperature field analysis model, and performing grid division on the primary temperature field analysis model after the constraint conditions are configured to obtain candidate temperature field analysis models of the target cable. And performing iterative training on the candidate temperature field analysis model, continuously adjusting the flow heat exchange coefficient of the candidate temperature field analysis model, and improving the accuracy of the output result until a target temperature field analysis model with the accuracy of the output result meeting the requirement is obtained.
In one embodiment, as shown in fig. 6, an alternative implementation of the cable temperature field determination method is:
s601, determining the material thermal resistance and the material heat capacity of each material layer in the target cable according to each material layer and the layer parameters of each material layer. Wherein the layer parameters include thermal resistivity and specific heat capacity.
S602, determining the environmental thermal resistance and the environmental heat capacity of the target cable according to the environmental parameters of the target cable. Wherein the environmental parameter includes at least one of air humidity, soil moisture content, and wind speed.
S603, constructing a thermal network topology model of the target cable according to the environmental thermal resistance and the environmental heat capacity, and the material thermal resistance and the material heat capacity of each material layer.
S604, constructing a physical simulation model of the target cable according to the cable structure of the target cable.
S605, importing the physical simulation model into finite element analysis software to obtain a primary temperature field analysis model of the target cable.
S606, configuring constraint conditions for the primary temperature field analysis model. Wherein the constraint conditions include an environmental condition and a boundary condition of the target cable; boundary conditions include convective heat transfer coefficients.
S607, carrying out grid division on the primary temperature field analysis model after the constraint condition is configured to obtain a candidate temperature field analysis model of the target cable.
S608, the conductor current of the test cable corresponding to the test surface temperature of the target cable is input into the candidate temperature field analysis model, and the test temperature field of the target cable is obtained.
S609, determining a temperature difference value between the predicted surface temperature corresponding to the test temperature field and the test surface temperature.
S6010, determining whether the temperature difference is less than a difference threshold. If yes, executing S6011; if not, S6012 is executed.
And S6011, taking the candidate temperature field analysis model as a target temperature field analysis model of the target cable.
And S6012, adjusting boundary conditions according to the preset step length to update the candidate temperature field analysis model, and based on the updated candidate temperature field analysis model, and returning to the step S608.
S6013, in response to the temperature field determination request for the target cable, acquiring the current surface temperature of the target cable.
And S6014, inputting the current surface temperature of the target cable into a thermal network topology model of the target cable to obtain the current cable conductor current of the target cable.
And S6015, inputting the current cable conductor current into a target temperature field analysis model of the target cable to obtain the current temperature field of the target cable.
In this embodiment, after receiving a temperature field determination request for a target cable, the current surface temperature of the target cable is acquired. And inputting the current surface temperature of the target cable into a thermal network topology model of the target cable to obtain the current cable conductor current of the target cable. Inputting the current cable conductor current into a target temperature field analysis model of the target cable to obtain a current temperature field of the target cable; the target temperature field analysis model is obtained by processing a cable structure of the target cable. According to the method, the thermal network topology model is adopted, the current cable conductor current can be determined based on the current surface temperature of the target cable, and then the current cable conductor current is input into the target temperature field analysis model of the target cable, so that the temperature of the cable conductor of the target cable can be accurately obtained, and the current temperature field of the target cable can be obtained.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a cable temperature field determining device for realizing the cable temperature field determining method. The implementation of the solution provided by the device is similar to the implementation described in the above method, so the specific limitations in the embodiments of the device for determining a cable temperature field provided below may be referred to the limitations of the method for determining a cable temperature field hereinabove, and will not be repeated here.
In one embodiment, as shown in fig. 7, there is provided a cable temperature field determination apparatus 1, comprising: an acquisition module 10, a first determination module 20 and a second determination module 30, wherein:
an acquisition module 10 for acquiring a current surface temperature of the target cable in response to a temperature field determination request for the target cable;
a first determining module 20, configured to input a current surface temperature of the target cable to a thermal network topology model of the target cable, to obtain a current cable conductor current of the target cable; the thermal network topology model is obtained by processing material information and environmental parameters of a target cable;
a second determining module 30, configured to input a current cable conductor current to a target temperature field analysis model of the target cable, to obtain a current temperature field of the target cable; the target temperature field analysis model is obtained by processing a cable structure of the target cable.
In one embodiment, for the first determining module 20 in fig. 7, the method is further specifically used for:
determining the material thermal resistance and the material heat capacity of each material layer in the target cable according to each material layer and the layer parameters of each material layer; wherein the layer parameters include thermal resistivity and specific heat capacity;
According to the environmental parameters of the target cable, determining the environmental thermal resistance and the environmental heat capacity of the target cable; wherein the environmental parameter includes at least one of air humidity, soil moisture content, and wind speed;
and constructing a thermal network topology model of the target cable according to the environmental thermal resistance and the environmental heat capacity, and the material thermal resistance and the material heat capacity of each material layer.
In one embodiment, the second determining module 30 in fig. 7 is further specifically configured to:
constructing a physical simulation model of the target cable according to the cable structure of the target cable;
based on finite element analysis software, a target temperature field analysis model of the target cable is constructed according to the physical simulation model.
In one embodiment, the second determining module 30 in fig. 7 is further specifically configured to:
importing the physical simulation model into finite element analysis software to obtain a primary temperature field analysis model of the target cable;
configuring constraint conditions for the primary temperature field analysis model, and constructing a target temperature field analysis model of the target cable based on the primary temperature field analysis model after the constraint conditions are configured; wherein the constraint conditions include an environmental condition and a boundary condition of the target cable; boundary conditions include convective heat transfer coefficients.
In one embodiment, the second determining module 30 in fig. 7 is further specifically configured to:
performing grid division on the initial temperature field analysis model after constraint conditions are configured to obtain candidate temperature field analysis models of the target cable;
inputting the test cable conductor current corresponding to the test surface temperature of the target cable into a candidate temperature field analysis model to obtain a test temperature field of the target cable;
determining a temperature difference between a predicted surface temperature corresponding to the test temperature field and the test surface temperature;
judging whether the temperature difference is smaller than a difference threshold;
if yes, the candidate temperature field analysis model is used as a target temperature field analysis model of the target cable.
In one embodiment, the cable temperature field determining device 1 in fig. 7 further comprises:
and the adjusting module is used for adjusting the boundary condition according to the preset step length to update the candidate temperature field analysis model if the temperature difference value is not smaller than the difference value threshold value, and based on the updated candidate temperature field analysis model, returning to execute the test cable conductor current corresponding to the test surface temperature of the target cable, and inputting the test cable conductor current into the candidate temperature field analysis model to obtain the test temperature field of the target cable.
The respective modules in the above-described cable temperature field determination device may be implemented in whole or in part by software, hardware, and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a server, and the internal structure of which may be as shown in fig. 8. The computer device includes a processor, a memory, an Input/Output interface (I/O) and a communication interface. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface is connected to the system bus through the input/output interface. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer device is used to store data related to the target cable. The input/output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method of determining a cable temperature field.
It will be appreciated by those skilled in the art that the structure shown in fig. 8 is merely a block diagram of some of the structures associated with the present application and is not limiting of the computer device to which the present application may be applied, and that a particular computer device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided comprising a memory and a processor, the memory having stored therein a computer program, the processor when executing the computer program performing the steps of:
acquiring a current surface temperature of the target cable in response to a temperature field determination request for the target cable;
inputting the current surface temperature of the target cable into a thermal network topology model of the target cable to obtain the current cable conductor current of the target cable; the thermal network topology model is obtained by processing material information and environmental parameters of a target cable;
inputting the current cable conductor current into a target temperature field analysis model of the target cable to obtain a current temperature field of the target cable; the target temperature field analysis model is obtained by processing a cable structure of the target cable.
In one embodiment, the processor when executing the computer program further performs the steps of: the material information comprises material layers and layer parameters of the material layers, and the material information and the environment parameters of the target cable are processed, including:
determining the material thermal resistance and the material heat capacity of each material layer in the target cable according to each material layer and the layer parameters of each material layer; wherein the layer parameters include thermal resistivity and specific heat capacity;
according to the environmental parameters of the target cable, determining the environmental thermal resistance and the environmental heat capacity of the target cable; wherein the environmental parameter includes at least one of air humidity, soil moisture content, and wind speed;
and constructing a thermal network topology model of the target cable according to the environmental thermal resistance and the environmental heat capacity, and the material thermal resistance and the material heat capacity of each material layer.
In one embodiment, the processor when executing the computer program further performs the steps of: processing a cable structure of a target cable, comprising:
constructing a physical simulation model of the target cable according to the cable structure of the target cable;
based on finite element analysis software, a target temperature field analysis model of the target cable is constructed according to the physical simulation model.
In one embodiment, the processor when executing the computer program further performs the steps of: based on finite element analysis software, constructing a target temperature field analysis model of a target cable according to a physical simulation model, comprising:
Importing the physical simulation model into finite element analysis software to obtain a primary temperature field analysis model of the target cable;
configuring constraint conditions for the primary temperature field analysis model, and constructing a target temperature field analysis model of the target cable based on the primary temperature field analysis model after the constraint conditions are configured; wherein the constraint conditions include an environmental condition and a boundary condition of the target cable; boundary conditions include convective heat transfer coefficients.
In one embodiment, the processor when executing the computer program further performs the steps of: based on the initial temperature field analysis model after the constraint condition is configured, a target temperature field analysis model of a target cable is constructed, and the method comprises the following steps:
performing grid division on the initial temperature field analysis model after constraint conditions are configured to obtain candidate temperature field analysis models of the target cable;
inputting the test cable conductor current corresponding to the test surface temperature of the target cable into a candidate temperature field analysis model to obtain a test temperature field of the target cable;
determining a temperature difference between a predicted surface temperature corresponding to the test temperature field and the test surface temperature;
judging whether the temperature difference is smaller than a difference threshold;
if yes, the candidate temperature field analysis model is used as a target temperature field analysis model of the target cable.
In one embodiment, the processor when executing the computer program further performs the steps of:
and if the temperature difference is not smaller than the difference threshold, adjusting boundary conditions according to a preset step length to update the candidate temperature field analysis model, and based on the updated candidate temperature field analysis model, returning to execute the test cable conductor current corresponding to the test surface temperature of the target cable, and inputting the test cable conductor current into the candidate temperature field analysis model to obtain the test temperature field of the target cable.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring a current surface temperature of the target cable in response to a temperature field determination request for the target cable;
inputting the current surface temperature of the target cable into a thermal network topology model of the target cable to obtain the current cable conductor current of the target cable; the thermal network topology model is obtained by processing material information and environmental parameters of a target cable;
inputting the current cable conductor current into a target temperature field analysis model of the target cable to obtain a current temperature field of the target cable; the target temperature field analysis model is obtained by processing a cable structure of the target cable.
In one embodiment, the computer program when executed by the processor further performs the steps of: the material information comprises material layers and layer parameters of the material layers, and the material information and the environment parameters of the target cable are processed, including:
determining the material thermal resistance and the material heat capacity of each material layer in the target cable according to each material layer and the layer parameters of each material layer; wherein the layer parameters include thermal resistivity and specific heat capacity;
according to the environmental parameters of the target cable, determining the environmental thermal resistance and the environmental heat capacity of the target cable; wherein the environmental parameter includes at least one of air humidity, soil moisture content, and wind speed;
and constructing a thermal network topology model of the target cable according to the environmental thermal resistance and the environmental heat capacity, and the material thermal resistance and the material heat capacity of each material layer.
In one embodiment, the computer program when executed by the processor further performs the steps of: processing a cable structure of a target cable, comprising:
constructing a physical simulation model of the target cable according to the cable structure of the target cable;
based on finite element analysis software, a target temperature field analysis model of the target cable is constructed according to the physical simulation model.
In one embodiment, the computer program when executed by the processor further performs the steps of: based on finite element analysis software, constructing a target temperature field analysis model of a target cable according to a physical simulation model, comprising:
Importing the physical simulation model into finite element analysis software to obtain a primary temperature field analysis model of the target cable;
configuring constraint conditions for the primary temperature field analysis model, and constructing a target temperature field analysis model of the target cable based on the primary temperature field analysis model after the constraint conditions are configured; wherein the constraint conditions include an environmental condition and a boundary condition of the target cable; boundary conditions include convective heat transfer coefficients.
In one embodiment, the computer program when executed by the processor further performs the steps of: based on the initial temperature field analysis model after the constraint condition is configured, a target temperature field analysis model of a target cable is constructed, and the method comprises the following steps:
performing grid division on the initial temperature field analysis model after constraint conditions are configured to obtain candidate temperature field analysis models of the target cable;
inputting the test cable conductor current corresponding to the test surface temperature of the target cable into a candidate temperature field analysis model to obtain a test temperature field of the target cable;
determining a temperature difference between a predicted surface temperature corresponding to the test temperature field and the test surface temperature;
judging whether the temperature difference is smaller than a difference threshold;
if yes, the candidate temperature field analysis model is used as a target temperature field analysis model of the target cable.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and if the temperature difference is not smaller than the difference threshold, adjusting boundary conditions according to a preset step length to update the candidate temperature field analysis model, and based on the updated candidate temperature field analysis model, returning to execute the test cable conductor current corresponding to the test surface temperature of the target cable, and inputting the test cable conductor current into the candidate temperature field analysis model to obtain the test temperature field of the target cable.
In one embodiment, a computer program product is provided comprising a computer program which, when executed by a processor, performs the steps of:
acquiring a current surface temperature of the target cable in response to a temperature field determination request for the target cable;
inputting the current surface temperature of the target cable into a thermal network topology model of the target cable to obtain the current cable conductor current of the target cable; the thermal network topology model is obtained by processing material information and environmental parameters of a target cable;
inputting the current cable conductor current into a target temperature field analysis model of the target cable to obtain a current temperature field of the target cable; the target temperature field analysis model is obtained by processing a cable structure of the target cable.
In one embodiment, the computer program when executed by the processor further performs the steps of: the material information comprises material layers and layer parameters of the material layers, and the material information and the environment parameters of the target cable are processed, including:
determining the material thermal resistance and the material heat capacity of each material layer in the target cable according to each material layer and the layer parameters of each material layer; wherein the layer parameters include thermal resistivity and specific heat capacity;
according to the environmental parameters of the target cable, determining the environmental thermal resistance and the environmental heat capacity of the target cable; wherein the environmental parameter includes at least one of air humidity, soil moisture content, and wind speed;
and constructing a thermal network topology model of the target cable according to the environmental thermal resistance and the environmental heat capacity, and the material thermal resistance and the material heat capacity of each material layer.
In one embodiment, the computer program when executed by the processor further performs the steps of: processing a cable structure of a target cable, comprising:
constructing a physical simulation model of the target cable according to the cable structure of the target cable;
based on finite element analysis software, a target temperature field analysis model of the target cable is constructed according to the physical simulation model.
In one embodiment, the computer program when executed by the processor further performs the steps of: based on finite element analysis software, constructing a target temperature field analysis model of a target cable according to a physical simulation model, comprising:
Importing the physical simulation model into finite element analysis software to obtain a primary temperature field analysis model of the target cable;
configuring constraint conditions for the primary temperature field analysis model, and constructing a target temperature field analysis model of the target cable based on the primary temperature field analysis model after the constraint conditions are configured; wherein the constraint conditions include an environmental condition and a boundary condition of the target cable; boundary conditions include convective heat transfer coefficients.
In one embodiment, the computer program when executed by the processor further performs the steps of: based on the initial temperature field analysis model after the constraint condition is configured, a target temperature field analysis model of a target cable is constructed, and the method comprises the following steps:
performing grid division on the initial temperature field analysis model after constraint conditions are configured to obtain candidate temperature field analysis models of the target cable;
inputting the test cable conductor current corresponding to the test surface temperature of the target cable into a candidate temperature field analysis model to obtain a test temperature field of the target cable;
determining a temperature difference between a predicted surface temperature corresponding to the test temperature field and the test surface temperature;
judging whether the temperature difference is smaller than a difference threshold;
if yes, the candidate temperature field analysis model is used as a target temperature field analysis model of the target cable.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and if the temperature difference is not smaller than the difference threshold, adjusting boundary conditions according to a preset step length to update the candidate temperature field analysis model, and based on the updated candidate temperature field analysis model, returning to execute the test cable conductor current corresponding to the test surface temperature of the target cable, and inputting the test cable conductor current into the candidate temperature field analysis model to obtain the test temperature field of the target cable.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the various embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the various embodiments provided herein may include at least one of relational databases and non-relational databases. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic units, quantum computing-based data processing logic units, etc., without being limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.
Claims (10)
1. A method of determining a cable temperature field, the method comprising:
acquiring a current surface temperature of a target cable in response to a temperature field determination request for the target cable;
inputting the current surface temperature of the target cable into a thermal network topology model of the target cable to obtain the current cable conductor current of the target cable; the thermal network topology model is obtained by processing material information and environmental parameters of the target cable;
Inputting the current cable conductor current to a target temperature field analysis model of the target cable to obtain a current temperature field of the target cable; the target temperature field analysis model is obtained by processing a cable structure of the target cable.
2. The method of claim 1, wherein the material information includes material layers and layer parameters of the material layers, and wherein the processing the material information and environmental parameters of the target cable includes:
determining the material thermal resistance and the material heat capacity of each material layer in the target cable according to each material layer and the layer parameters of each material layer; wherein the layer parameters include thermal resistivity and specific heat capacity;
according to the environmental parameters of the target cable, determining the environmental thermal resistance and the environmental heat capacity of the target cable; wherein the environmental parameters include at least one of air humidity, soil moisture content, wind speed, and ambient temperature;
and constructing a thermal network topology model of the target cable according to the environmental thermal resistance and the environmental heat capacity, and the material thermal resistance and the material heat capacity of each material layer.
3. The method of claim 1, wherein said processing the cable structure of the target cable comprises:
Constructing a physical simulation model of the target cable according to the cable structure of the target cable;
and constructing a target temperature field analysis model of the target cable according to the physical simulation model based on finite element analysis software.
4. A method according to claim 3, wherein the constructing a target temperature field analysis model of the target cable based on the finite element analysis software from the physical simulation model comprises:
importing the physical simulation model into finite element analysis software to obtain a primary temperature field analysis model of the target cable;
configuring constraint conditions for the primary temperature field analysis model, and constructing a target temperature field analysis model of the target cable based on the primary temperature field analysis model after the constraint conditions are configured; wherein the constraints include environmental conditions and boundary conditions of the target cable; the boundary condition includes a convective heat transfer coefficient.
5. The method of claim 4, wherein constructing the target temperature field analysis model of the target cable based on the initial temperature field analysis model after configuration constraints comprises:
performing grid division on the primary temperature field analysis model after constraint conditions are configured to obtain candidate temperature field analysis models of the target cable;
Inputting the test cable conductor current corresponding to the test surface temperature of the target cable into the candidate temperature field analysis model to obtain a test temperature field of the target cable;
determining a temperature difference between a predicted surface temperature and a test surface temperature corresponding to the test temperature field;
judging whether the temperature difference is smaller than a difference threshold;
and if so, taking the candidate temperature field analysis model as a target temperature field analysis model of the target cable.
6. The method of claim 5, wherein the method further comprises:
and if the temperature difference is not smaller than the difference threshold, adjusting the boundary condition according to a preset step length to update the candidate temperature field analysis model, returning to execute the input of the test cable conductor current corresponding to the test surface temperature of the target cable to the candidate temperature field analysis model based on the updated candidate temperature field analysis model, and obtaining the test temperature field of the target cable.
7. A cable temperature field determination apparatus, comprising:
an acquisition module for acquiring a current surface temperature of a target cable in response to a temperature field determination request for the target cable;
The first determining module is used for inputting the current surface temperature of the target cable into the thermal network topology model of the target cable to obtain the current cable conductor current of the target cable; the thermal network topology model is obtained by processing material information and environmental parameters of the target cable;
the second determining module is used for inputting the current cable conductor current to a target temperature field analysis model of the target cable to obtain a current temperature field of the target cable; the target temperature field analysis model is obtained by processing a cable structure of the target cable.
8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the cable temperature field determination method of any one of claims 1 to 6.
9. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the cable temperature field determination method of any one of claims 1 to 6.
10. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, implements the steps of the cable temperature field determination method as claimed in any one of claims 1 to 6.
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| CN202311600079.7A CN117725777A (en) | 2023-11-27 | 2023-11-27 | Cable temperature field determining method, device, computer equipment and storage medium |
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| CN202311600079.7A CN117725777A (en) | 2023-11-27 | 2023-11-27 | Cable temperature field determining method, device, computer equipment and storage medium |
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