CN112345864A - Method and device for detecting current-carrying capacity of overhead transmission line - Google Patents
Method and device for detecting current-carrying capacity of overhead transmission line Download PDFInfo
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Abstract
The application discloses a method and a device for detecting current-carrying capacity of an overhead transmission line, wherein the method comprises the following steps: arranging the metal ball at the position in the same air environment as the overhead transmission line, and enabling the metal ball to be in a temperature stable state when the overhead transmission line normally runs to obtain the temperature of the metal ball, wherein the material of the metal ball is the same as that of the overhead transmission line; calculating the heat exchange coefficient of the metal sphere according to the temperature of the metal sphere based on the heat balance equation of the metal sphere; obtaining the Reynolds number of the metal sphere according to the relationship between the Nonsell number and the heat exchange coefficient, and substituting the Reynolds number of the metal sphere into a Reynolds number relationship formula for calculation to obtain the Reynolds number of the overhead transmission line; the current-carrying capacity of the overhead transmission line is calculated according to the Reynolds number of the overhead transmission line based on a heat balance equation current-carrying capacity calculation formula of the overhead transmission line, so that the technical problem that the current-carrying capacity detection error of the overhead transmission line is large due to the fact that the environmental parameter measurement accuracy of the overhead transmission line is low in the prior art is solved.
Description
Technical Field
The application relates to the technical field of electric power, in particular to a method and a device for detecting current-carrying capacity of an overhead transmission line.
Background
With the rapid growth of economy in China, the power consumption demand is further increased, and the density and scale of the existing power transmission corridors of the power grid are larger and larger, so that the difficulty in erecting new power transmission corridors on the basis of the existing large-scale and high-density power transmission corridors is very high, and therefore, the problem that how to dig the potential transmission capacity on the basis of the existing power transmission corridors is urgently solved.
At present, methods for increasing capacity of overhead transmission lines can be divided into static capacity increasing technology and dynamic capacity increasing technology. The static capacity increasing technology increases the temperature tolerance level of the overhead transmission line, so that the current-carrying capacity of the overhead transmission line is improved; and the dynamic capacity increasing technology is used for calculating the real-time current-carrying capacity of the overhead transmission line based on different models by monitoring the state of the overhead transmission line and the meteorological environment in real time.
However, the existing dynamic capacity increasing technology has low measurement precision on environmental parameters of the overhead transmission line, so that the current-carrying capacity detection error of the overhead transmission line is large.
Disclosure of Invention
The application provides a detection method and a detection device for the current-carrying capacity of an overhead transmission line, which are used for solving the technical problem that the current-carrying capacity detection error of the overhead transmission line is large due to the fact that the environmental parameter measurement precision of the overhead transmission line is low in the prior art.
In view of this, a first aspect of the present application provides a method for detecting a current-carrying capacity of an overhead transmission line, where the method includes:
arranging a metal sphere at the position of the same air environment as that of an overhead transmission line, and when the overhead transmission line normally operates, enabling the metal sphere to be in a temperature stable state to obtain the temperature of the metal sphere, wherein the metal sphere is made of the same material as that of the overhead transmission line;
calculating the heat exchange coefficient of the metal sphere according to the temperature of the metal sphere based on the heat balance equation of the metal sphere;
obtaining the Reynolds number of the metal sphere according to the relationship between the Knoop number and the heat exchange coefficient, and substituting the Reynolds number of the metal sphere into a Reynolds number relationship formula for calculation to obtain the Reynolds number of the overhead transmission line;
and calculating the current-carrying capacity of the overhead transmission line according to the Reynolds number of the overhead transmission line based on a heat balance equation current-carrying capacity calculation formula of the overhead transmission line.
Optionally, the metal sphere is an aluminum sphere.
Optionally, when the overhead transmission line normally operates, the making the metal sphere in a temperature stable state specifically includes:
when the overhead transmission line normally operates, the metal sphere is heated by the constant heat source, so that the metal sphere is in a temperature stable state.
Optionally, the constant heat source is a heating resistance wire.
Optionally, the calculating the heat exchange coefficient of the metal sphere according to the temperature of the metal sphere based on the heat balance equation of the metal sphere specifically includes:
and converting the heat balance equation of the metal sphere through a Newton cooling law to obtain a convective heat transfer coefficient formula of the metal sphere, and substituting the temperature of the metal sphere into the convective heat transfer coefficient formula for calculation to obtain the heat transfer coefficient of the metal sphere.
Optionally, the current carrying capacity calculation formula of the heat balance equation is as follows:
wherein:
wherein I is the current-carrying capacity of the overhead transmission line, qsIs the solar heat absorption power of the overhead transmission line, qrOf said overhead transmission lineRadiation power, R (T) is the resistance of the overhead transmission line at a temperature T, KangleIn the direction of wind, RecIs Reynolds number, k, of the overhead transmission linefFor thermal conductivity of air, TcIs the temperature, T, of the overhead transmission lineaIs the ambient temperature of the overhead transmission line.
This application second aspect provides a detection device of overhead transmission line current-carrying capacity, the device includes:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for arranging a metal sphere at the position of the same air environment as that of an overhead transmission line, and when the overhead transmission line normally operates, the metal sphere is in a temperature stable state to acquire the temperature of the metal sphere, and the material of the metal sphere is the same as that of the overhead transmission line;
the first calculation unit is used for calculating the heat exchange coefficient of the metal sphere according to the temperature of the metal sphere based on the heat balance equation of the metal sphere;
the second calculating unit is used for obtaining the Reynolds number of the metal sphere according to the relationship between the Knudel number and the heat exchange coefficient, substituting the Reynolds number of the metal sphere into a Reynolds number relationship formula for calculation, and obtaining the Reynolds number of the overhead transmission line;
and the third calculating unit is used for calculating the current-carrying capacity of the overhead transmission line according to the Reynolds number of the overhead transmission line based on a current-carrying capacity calculating formula of a thermal balance equation of the overhead transmission line.
Optionally, the metal sphere is an aluminum sphere.
Optionally, the obtaining unit is specifically configured to:
the method comprises the steps that a metal ball body is arranged at the position in the same air environment with an overhead transmission line, when the overhead transmission line normally operates, the metal ball body is heated through a heating resistance wire, the metal ball body is in a temperature stable state, the temperature of the metal ball body is obtained, and the material of the metal ball body is the same as that of the overhead transmission line.
Optionally, the first computing unit is specifically configured to:
and converting the heat balance equation of the metal sphere through a Newton cooling law to obtain a convective heat transfer coefficient formula of the metal sphere, and substituting the temperature of the metal sphere into the convective heat transfer coefficient formula for calculation to obtain the heat transfer coefficient of the metal sphere.
According to the technical scheme, the method has the following advantages:
in the embodiment of the application, a method for detecting the current-carrying capacity of an overhead transmission line is provided, and the method comprises the following steps: arranging the metal ball at the position in the same air environment as the overhead transmission line, and enabling the metal ball to be in a temperature stable state when the overhead transmission line normally runs to obtain the temperature of the metal ball, wherein the material of the metal ball is the same as that of the overhead transmission line; calculating the heat exchange coefficient of the metal sphere according to the temperature of the metal sphere based on the heat balance equation of the metal sphere; obtaining the Reynolds number of the metal sphere according to the relationship between the Nonsell number and the heat exchange coefficient, and substituting the Reynolds number of the metal sphere into a Reynolds number relationship formula for calculation to obtain the Reynolds number of the overhead transmission line; and calculating the current-carrying capacity of the overhead transmission line according to the Reynolds number of the overhead transmission line based on a heat balance equation current-carrying capacity calculation formula of the overhead transmission line.
The utility model provides a detection method of overhead transmission line current-carrying capacity, through set up the metal spheroid in the position with the same air circumstance of overhead transmission line, make the metal spheroid have environmental factors such as the same ambient temperature with overhead transmission line, because overhead transmission line is in the temperature steady state when normal operating, consequently make the metal spheroid be in behind the temperature steady state, obtain the temperature of metal spheroid, and obtain the reynolds number of metal spheroid based on the heat balance equation, the reynolds number of overhead transmission line is obtained with the relation of overhead transmission line reynolds number through the reynolds number of metal spheroid, the current-carrying capacity that obtains overhead transmission line is calculated through heat balance equation current-carrying capacity according to the reynolds number of overhead transmission line at last. This application only needs to reflect overhead transmission line's convection heat transfer state indirectly through the metal spheroid, and consequently the calculation obtains overhead transmission line current-carrying capacity accurate, and implements the degree of difficulty low, and the reliability is high, has solved prior art and has lower to overhead transmission line's environmental parameter measurement accuracy, leads to the great technical problem of current-carrying capacity detection error to overhead transmission line.
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Fig. 1 is a schematic flow chart of a first embodiment of a method for detecting a current-carrying capacity of an overhead transmission line provided in an embodiment of the present application;
fig. 2 is a schematic flowchart of a second embodiment of a method for detecting a current-carrying capacity of an overhead transmission line according to the embodiment of the present application;
fig. 3 is a structural diagram of an embodiment of a device for detecting a current-carrying capacity of an overhead transmission line according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, a first embodiment of a method for detecting a current-carrying capacity of an overhead transmission line according to an embodiment of the present application includes:
It should be noted that, in order to ensure that the environmental factors such as the environmental temperature of the metal sphere and the overhead transmission line are the same, the metal sphere is disposed at the position of the same air environment as the overhead transmission line, because the temperature is in a stable state when the overhead transmission line normally operates, in order to indirectly reflect the convection heat transfer state of the overhead transmission line through the metal sphere, the metal sphere is in a stable temperature state, and the temperature of the metal sphere is obtained, and the material of the metal sphere is the same as that of the overhead transmission line.
And 102, calculating the heat exchange coefficient of the metal sphere according to the temperature of the metal sphere based on the heat balance equation of the metal sphere.
It should be noted that the heat exchange coefficient is obtained by simply converting the heat balance equation of the metal sphere.
Wherein, the heat balance equation of the metal sphere is as follows:
qcs+qrs＝qss+qgs；
in the formula, qcsIs the convective heat dissipation power of a metal sphere, qrsIs the radiation heat dissipation power of a metal sphere, qssIs the solar heat absorption power of a metal sphere, qgsIs the power of an internal heat source of the metal ball.
And 103, obtaining the Reynolds number of the metal sphere according to the relationship between the Knoop number and the heat exchange coefficient, and substituting the Reynolds number of the metal sphere into a Reynolds number relationship formula for calculation to obtain the Reynolds number of the overhead transmission line.
It should be noted that the heat transfer coefficient of the metal sphere and the nussel number Nu have the following relationship:
the Knoop number Nu of the metal sphere and the Reynolds number of the metal sphere have the following relations:
in the formula, kfIs the air thermal conductivity; mu.sf、μwRespectively represents the dynamic viscosity of air environment and the dynamic viscosity of surface air of the metal sphere, Pr is the Plantt number, ResIs the reynolds number of a metal sphere.
It can be understood that, the reynolds number of the metal sphere is obtained by calculation according to the relationship between the knoop number and the heat exchange coefficient, and it should be noted that the reynolds number of the overhead transmission line can be obtained by the relationship between the reynolds number of the metal sphere and the reynolds number of the overhead transmission line, and the relationship of the reynolds number of the metal sphere is:
in the formula, RecReynolds number, Re, of an overhead transmission linesReynolds number for a metal sphere, D0The diameter of the overhead transmission line.
And step 104, calculating the current-carrying capacity of the overhead transmission line according to the Reynolds number of the overhead transmission line based on a current-carrying capacity calculation formula of a thermal balance equation of the overhead transmission line.
And substituting the Reynolds number of the overhead transmission line into a heat balance equation current-carrying capacity calculation formula for calculation, so as to obtain the current-carrying capacity of the overhead transmission line.
The utility model provides a detection method of overhead transmission line current-carrying capacity, set up the position at the same air circumstance with overhead transmission line through the metal spheroid, make the metal spheroid have environmental factor such as the same ambient temperature with overhead transmission line, because overhead transmission line is in the temperature stable state when normal operating, consequently make the metal spheroid be in behind the temperature stable state, obtain the temperature of metal spheroid, and obtain the reynolds number of metal spheroid based on the heat balance equation, then obtain overhead transmission line's reynolds number through the relation of metal spheroid reynolds number and overhead transmission line reynolds number, the current-carrying capacity that obtains overhead transmission line is calculated through heat balance equation current-carrying capacity according to the reynolds number of overhead transmission line at last. This application only needs to reflect overhead transmission line's convection heat transfer state indirectly through the metal spheroid, and consequently the calculation obtains overhead transmission line current-carrying capacity accurate, and implements the degree of difficulty low, and the reliability is high, has solved prior art and has lower to overhead transmission line's environmental parameter measurement accuracy, leads to the great technical problem of current-carrying capacity detection error to overhead transmission line.
The first embodiment of the method for detecting the current-carrying capacity of the overhead transmission line provided by the embodiment of the application is as follows.
Referring to fig. 2, a second embodiment of the method for detecting the current-carrying capacity of an overhead transmission line provided in the embodiment of the present application includes:
It should be noted that, because the aluminum ball has good heat conductivity and the overhead transmission line is made of aluminum, the metal ball is set as the aluminum ball; in addition, in the embodiment, the constant heat source is set as the heating resistance wire to heat the aluminum ball, so that the aluminum ball is in the temperature stable state, the implementation of the aluminum ball in the temperature stable state through the heating resistance wire is simple, the reliability is high, a person skilled in the art can also make the aluminum ball be in the temperature stable state through other modes, and the temperature of the aluminum ball is obtained when the aluminum ball is in the temperature stable state.
The heat balance equation of the aluminum ball is converted through the Newton's cooling law to obtain the convective heat transfer coefficient formula of the aluminum ball, wherein the convective heat transfer coefficient formula of the aluminum ball is as follows:
wherein h is the heat transfer coefficient, l is the diameter of the metal sphere, TsCalculating the temperature, T, of the ballaIs the ambient temperature at which the metal sphere is located.
And 203, obtaining the Reynolds number of the aluminum ball according to the relationship between the Knoop number and the heat exchange coefficient, and substituting the Reynolds number of the aluminum ball into a Reynolds number relational formula for calculation to obtain the Reynolds number of the overhead transmission line.
Step 203 is the same as the description of step 103 in the first embodiment, please refer to the description of step 103, which is not repeated herein.
And 204, calculating the current-carrying capacity of the overhead transmission line according to the Reynolds number of the overhead transmission line based on a current-carrying capacity calculation formula of a thermal balance equation of the overhead transmission line.
Step 204 is the same as step 104 of the first embodiment, please refer to step 104, and will not be described herein again.
Wherein, the current-carrying capacity calculation formula of the heat balance equation is as follows:
wherein:
wherein I is the current-carrying capacity of the overhead transmission line, qsFor the solar heat absorption power of an overhead transmission line, qrFor the radiated heat power of an overhead transmission line, R (T) is the resistance of the overhead transmission line at a temperature T, KangleIn the direction of wind, RecReynolds number, k, of an overhead transmission linefFor thermal conductivity of air, TcTemperature, T, of overhead transmission linesaIs the ambient temperature of the overhead transmission line.
The utility model provides a detection method of overhead transmission line current-carrying capacity, it is good to consider the aluminum ball heat conductivity, and overhead transmission line material is mostly aluminium, consequently set up the metal spheroid into the aluminum ball, and set up the position in the same air circumstance with overhead transmission line through the aluminum ball, make the aluminum ball have environmental factor such as the same ambient temperature with overhead transmission line, because overhead transmission line is in the temperature stable state at normal operating, consequently make the aluminum ball be in behind the temperature steady state, obtain the temperature of aluminum ball, and obtain the reynolds number of aluminum ball based on the heat balance equation, obtain overhead transmission line's reynolds number through the relation of aluminum ball reynolds number and overhead transmission line reynolds number after that, the current-carrying capacity of overhead transmission line is obtained through the calculation of heat balance equation current-carrying capacity according to overhead transmission line's reynolds number. This application only needs to reflect overhead transmission line's convection heat transfer state indirectly through the metal spheroid, and consequently the calculation obtains overhead transmission line current-carrying capacity accurate, and implements the degree of difficulty low, and the reliability is high, has solved prior art and has lower to overhead transmission line's environmental parameter measurement accuracy, leads to the great technical problem of current-carrying capacity detection error to overhead transmission line.
The second embodiment of the method for detecting the current-carrying capacity of the overhead transmission line provided in the embodiment of the present application is as follows.
Referring to fig. 3, an embodiment of a device for detecting a current-carrying capacity of an overhead transmission line according to the present application includes:
the obtaining unit 301 is configured to set the metal sphere at a position in the same air environment as the overhead transmission line, and when the overhead transmission line normally operates, the metal sphere is in a temperature stable state to obtain the temperature of the metal sphere, and the material of the metal sphere is the same as that of the overhead transmission line;
the first calculating unit 302 is configured to calculate a heat exchange coefficient of the metal sphere according to a temperature of the metal sphere based on a thermal balance equation of the metal sphere;
the second calculating unit 303 is configured to obtain a reynolds number of the metal sphere according to a relationship between the knoop number and the heat exchange coefficient, and calculate the reynolds number of the metal sphere by substituting the reynolds number of the metal sphere into a reynolds number relationship formula to obtain a reynolds number of the overhead transmission line;
and the third calculating unit 304 is configured to calculate, based on a current-carrying capacity calculation formula of a thermal balance equation of the overhead transmission line, a current-carrying capacity of the overhead transmission line according to a reynolds number of the overhead transmission line.
The utility model provides a detection apparatus for overhead transmission line current-carrying capacity, set up the position at the same air circumstance with overhead transmission line through the metal spheroid, make the metal spheroid have environmental factor such as the same ambient temperature with overhead transmission line, because overhead transmission line is in the temperature stable state when normal operating, consequently make the metal spheroid be in behind the temperature stable state, acquire the temperature of metal spheroid, and obtain the reynolds number of metal spheroid based on the heat balance equation, the reynolds number of overhead transmission line is acquireed with the relation of overhead transmission line reynolds number through the reynolds number of metal spheroid, the current-carrying capacity that overhead transmission line was obtained in the reynolds number through the calculation of heat balance equation current-carrying capacity according to overhead transmission line at last. This application only needs to reflect overhead transmission line's convection heat transfer state indirectly through the metal spheroid, and consequently the calculation obtains overhead transmission line current-carrying capacity accurate, and implements the degree of difficulty low, and the reliability is high, has solved prior art and has lower to overhead transmission line's environmental parameter measurement accuracy, leads to the great technical problem of current-carrying capacity detection error to overhead transmission line.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The terms "first," "second," "third," "fourth," and the like in the description of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A method for detecting the current-carrying capacity of an overhead transmission line is characterized by comprising the following steps:
arranging a metal sphere at the position of the same air environment as that of an overhead transmission line, and when the overhead transmission line normally operates, enabling the metal sphere to be in a temperature stable state to obtain the temperature of the metal sphere, wherein the metal sphere is made of the same material as that of the overhead transmission line;
calculating the heat exchange coefficient of the metal sphere according to the temperature of the metal sphere based on the heat balance equation of the metal sphere;
obtaining the Reynolds number of the metal sphere according to the relationship between the Knoop number and the heat exchange coefficient, and substituting the Reynolds number of the metal sphere into a Reynolds number relationship formula for calculation to obtain the Reynolds number of the overhead transmission line;
and calculating the current-carrying capacity of the overhead transmission line according to the Reynolds number of the overhead transmission line based on a heat balance equation current-carrying capacity calculation formula of the overhead transmission line.
2. The method for detecting the current-carrying capacity of the overhead transmission line according to claim 1, wherein the metal sphere is an aluminum sphere.
3. The method for detecting the current-carrying capacity of the overhead transmission line according to claim 1, wherein when the overhead transmission line normally operates, the metal sphere is in a temperature stable state, and specifically comprises:
when the overhead transmission line normally operates, the metal sphere is heated by the constant heat source, so that the metal sphere is in a temperature stable state.
4. The method for detecting the current-carrying capacity of the overhead transmission line according to claim 3, wherein the constant heat source is a heating resistance wire.
5. The method for detecting the current-carrying capacity of the overhead transmission line according to claim 1, wherein the calculating of the heat exchange coefficient of the metal sphere according to the temperature of the metal sphere based on the heat balance equation of the metal sphere specifically comprises:
and converting the heat balance equation of the metal sphere through a Newton cooling law to obtain a convective heat transfer coefficient formula of the metal sphere, and substituting the temperature of the metal sphere into the convective heat transfer coefficient formula for calculation to obtain the heat transfer coefficient of the metal sphere.
6. The method for detecting the ampacity of the overhead transmission line according to claim 1, wherein the ampacity of the thermal balance equation is calculated by the following formula:
wherein:
wherein I is the current-carrying capacity of the overhead transmission line, qsIs the solar heat absorption power of the overhead transmission line, qrFor the radiated heat power of said overhead transmission line, R (T) is the resistance of said overhead transmission line at a temperature T, KangleIn the direction of wind, RecIs Reynolds number, k, of the overhead transmission linefFor thermal conductivity of air, TcIs the temperature, T, of the overhead transmission lineaIs the ambient temperature of the overhead transmission line.
7. The utility model provides a detection apparatus for overhead transmission line ampacity which characterized in that includes:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for arranging a metal sphere at the position of the same air environment as that of an overhead transmission line, and when the overhead transmission line normally operates, the metal sphere is in a temperature stable state to acquire the temperature of the metal sphere, and the material of the metal sphere is the same as that of the overhead transmission line;
the first calculation unit is used for calculating the heat exchange coefficient of the metal sphere according to the temperature of the metal sphere based on the heat balance equation of the metal sphere;
the second calculating unit is used for obtaining the Reynolds number of the metal sphere according to the relationship between the Knudel number and the heat exchange coefficient, substituting the Reynolds number of the metal sphere into a Reynolds number relationship formula for calculation, and obtaining the Reynolds number of the overhead transmission line;
and the third calculating unit is used for calculating the current-carrying capacity of the overhead transmission line according to the Reynolds number of the overhead transmission line based on a current-carrying capacity calculating formula of a thermal balance equation of the overhead transmission line.
8. The device for detecting the current-carrying capacity of the overhead transmission line according to claim 7, wherein the metal sphere is an aluminum sphere.
9. The device for detecting the current-carrying capacity of the overhead transmission line according to claim 7, wherein the obtaining unit is specifically configured to:
the method comprises the steps that a metal ball body is arranged at the position in the same air environment with an overhead transmission line, when the overhead transmission line normally operates, the metal ball body is heated through a heating resistance wire, the metal ball body is in a temperature stable state, the temperature of the metal ball body is obtained, and the material of the metal ball body is the same as that of the overhead transmission line.
10. The device according to claim 7, wherein the first calculating unit is specifically configured to:
and converting the heat balance equation of the metal sphere through a Newton cooling law to obtain a convective heat transfer coefficient formula of the metal sphere, and substituting the temperature of the metal sphere into the convective heat transfer coefficient formula for calculation to obtain the heat transfer coefficient of the metal sphere.
Priority Applications (1)
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