Composite insulator interface heating source temperature calculation method, system, equipment and medium

Abstract

The invention belongs to the technical field of power systems, and discloses a composite insulator interface heating source temperature calculation method, system and device and a medium, and the method comprises the steps: building a composite insulator sheath heat transfer model; based on the composite insulator sheath heat transfer model, constructing a composite insulator internal and external temperature mapping relation; the internal and external temperature mapping relation of the composite insulator is a linear function relation formed by the interface heating source temperature of the composite insulator, the surface temperature of the sheath of the composite insulator, material parameters and environmental parameters; and obtaining the current surface temperature, material parameters and environmental parameters of the composite insulator sheath, and calculating the current interface heating source temperature of the composite insulator based on the internal and external temperature mapping relation of the composite insulator. According to the method, the internal heating temperature of the composite insulator can be calculated, and technical support is provided for operation and maintenance of a power grid department, so that the operation state of the heating composite insulator can be determined conveniently, missed disposal opportunities caused by misjudgment are avoided, and serious power grid safety accidents caused by breakage of the composite insulator are prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a method, system, equipment and medium for calculating the temperature of a heat source at an interface of a composite insulator. Background Art

[0002] Composite insulators are widely used in power systems due to their excellent anti-pollution flashover performance, but the frequent occurrence of abnormal heating problems that may cause composite insulator fractures has brought severe challenges to the safe and stable operation of power grids. The source of this abnormal heating is located at the core rod-sheath interface.

[0003] The abnormal heating phenomenon of composite insulators is generally observed by infrared thermal imagers. According to the detection principle of infrared thermal imagers, the temperature measured by the instrument is only the surface temperature of the heating area of ​​the composite insulator, but the temperature of the core rod-sheath interface, which is a key factor affecting the operating performance of the composite insulator, cannot be directly obtained. Studies have shown that high temperature can cause epoxy resin degradation and glass fiber cracking in the core rod, and eventually cause the composite insulator to decay and break. For composite insulators with interface heating, the low temperature value on the surface may mask the high temperature value at the internal core rod-sheath interface heat source, causing the staff to misjudge the operating status of the composite insulator.

[0004] Therefore, in order to correctly evaluate the operating status of the composite insulator, it is necessary to obtain the temperature information at the heat source of the composite insulator interface through certain methods. Summary of the invention

[0005] The embodiments of the present invention provide a method, system, device and medium for calculating the temperature of a heat source at an interface of a composite insulator to solve the above-mentioned technical problems in the prior art.

[0006] In order to have a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended to be a general review, nor is it intended to identify key / important components or to delineate the scope of protection of these embodiments. Its only purpose is to present some concepts in a simple form as a preface to the detailed description that follows.

[0007] According to a first aspect of an embodiment of the present invention, a method for calculating the temperature of a heat source at an interface of a composite insulator is provided.

[0008] In one embodiment, the method for calculating the temperature of the heat source at the composite insulator interface includes:

[0009] The heating phenomenon at the composite insulator core rod-sheath interface is analyzed, and a composite insulator sheath heat transfer model is established based on the analysis results.

[0010] Based on the composite insulator sheath heat transfer model, a mapping relationship between the internal and external temperatures of the composite insulator is constructed; wherein the mapping relationship between the internal and external temperatures of the composite insulator is a linear function relationship between the temperature of the heat source at the composite insulator interface and the surface temperature of the composite insulator sheath, material parameters, and environmental parameters;

[0011] The current composite insulator sheath surface temperature, material parameters and environmental parameters are obtained, and based on the mapping relationship between the internal and external temperatures of the composite insulator, the current composite insulator interface heat source temperature is calculated.

[0012] In one embodiment, the heating phenomenon of the composite insulator core rod-sheath interface is analyzed, and the composite insulator sheath heat transfer model is established according to the analysis results, including:

[0013] When the core rod-sheath interface of the composite insulator is heated, based on the cylindrical coordinate system and according to the forward heat transfer process from the composite insulator-sheath interface to the sheath surface, a two-dimensional solution model for the composite insulator-sheath interface heat conduction forward problem is established, and the composite insulator-sheath heat transfer model is obtained.

[0014] In one embodiment, the heat transfer equation of the composite insulator sheath heat transfer model is:

[0015]

[0016] In the formula, ρ is the sheath density of the composite insulator; c is the sheath specific heat capacity of the composite insulator; T is the sheath temperature of the composite insulator; τ is the time; r is the sheath polar diameter position of the composite insulator; λ is the sheath thermal conductivity of the composite insulator; θ is the sheath polar angle position of the composite insulator; is the symbol of the partial derivative; z is the ordinate parameter in the cylindrical coordinate system; q v It is the heat source inside the sheath.

[0017] In one embodiment, based on the composite insulator sheath heat transfer model, constructing a mapping relationship between the internal and external temperatures of the composite insulator includes:

[0018] Based on the composite insulator sheath heat transfer model, determining the temperature distribution relationship of the composite insulator sheath in the radial direction;

[0019] In a stable temperature field state, integrating the temperature distribution relationship of the composite insulator sheath in the radial direction, and solving the radial temperature distribution relationship of the composite insulator sheath in a stable temperature field state based on the boundary conditions of a given composite insulator sheath heat transfer model;

[0020] According to the radial temperature distribution relationship of the composite insulator sheath under the stable temperature field state and based on the inner diameter of the composite insulator sheath, the mapping relationship between the internal and external temperatures of the composite insulator is solved.

[0021] In one embodiment, the temperature distribution relationship of the composite insulator sheath in the radial direction is expressed as follows:

[0022]

[0023] In the formula, ρ is the sheath density of the composite insulator; c is the sheath specific heat capacity of the composite insulator; T is the sheath temperature of the composite insulator; τ is the time; r is the sheath pole position of the composite insulator; λ is the thermal conductivity of the sheath of the composite insulator; is the symbol of partial derivative; q v It is the heat source inside the sheath.

[0024] In one embodiment, under the stable temperature field state, the equation obtained by integrating the temperature distribution relationship of the composite insulator sheath in the radial direction is:

[0025] T(r)=C1lnr+C2

[0026]

[0027] Where, T is the sheath temperature of the composite insulator; τ is the time, r is the sheath pole position of the composite insulator; λ is the thermal conductivity of the sheath of the composite insulator; T w The maximum temperature outside the sheath of the composite insulator; T h is the ambient temperature; r2 is the outer diameter of the sheath of the composite insulator; h c is the convective heat dissipation coefficient of the outer side of the sheath of the composite insulator; C1 and C2 are both integral operation constants.

[0028] In one embodiment, the boundary condition equation of the composite insulator sheath heat transfer model is:

[0029] T(r2)=T w

[0030]

[0031] Where, T is the sheath temperature of the composite insulator; r is the sheath pole diameter position of the composite insulator; is the symbol of partial derivative; h c is the convection heat dissipation coefficient of the outer sheath of the composite insulator; T w The maximum temperature outside the sheath of the composite insulator; T h is the ambient temperature; r2 is the outer diameter of the sheath of the composite insulator.

[0032] In one embodiment, the equation for the radial temperature distribution relationship of the composite insulator sheath in the stable temperature field state is:

[0033]

[0034] Where, T is the sheath temperature of the composite insulator; r is the sheath pole diameter position of the composite insulator; is the sign of partial derivative; λ is the thermal conductivity of the sheath of composite insulator; h c is the convection heat dissipation coefficient of the outer sheath of the composite insulator; T w The maximum temperature outside the sheath of the composite insulator; T h is the ambient temperature; r2 is the outer diameter of the sheath of the composite insulator.

[0035] In one embodiment, the material parameters include the inner diameter of the composite insulator sheath, the outer diameter of the composite insulator sheath, the thermal conductivity of the composite insulator sheath material, and the convection heat dissipation coefficient of the composite insulator sheath outside; the environmental parameters include the ambient temperature.

[0036] In one embodiment, the equation for the mapping relationship between the internal and external temperatures of the composite insulator is:

[0037]

[0038] Where, T n is the temperature of the heat source at the composite insulator interface, T w is the maximum temperature outside the sheath of the composite insulator, r1 is the inner diameter of the sheath of the composite insulator, r2 is the outer diameter of the sheath of the composite insulator, λ is the thermal conductivity of the sheath material of the composite insulator, h c is the convection heat dissipation coefficient of the outer sheath of the composite insulator, T h is the ambient temperature.

[0039] According to a second aspect of an embodiment of the present invention, a composite insulator interface heat source temperature calculation system is provided.

[0040] In one embodiment, the composite insulator interface heat source temperature calculation system includes:

[0041] The heat transfer model building module is used to analyze the heating phenomenon at the composite insulator core rod-sheath interface and build a composite insulator sheath heat transfer model based on the analysis results;

[0042] A temperature relationship building module is used to build a temperature mapping relationship between the inside and outside of a composite insulator based on the composite insulator sheath heat transfer model; wherein the temperature mapping relationship between the inside and outside of the composite insulator is a linear function relationship between the temperature of the heat source at the composite insulator interface and the surface temperature of the composite insulator sheath, material parameters, and environmental parameters;

[0043] The interface temperature calculation module is used to obtain the current composite insulator sheath surface temperature and material parameters and environmental parameters, and based on the mapping relationship between the internal and external temperatures of the composite insulator, calculate the current composite insulator interface heat source temperature.

[0044] In one embodiment, the heat transfer model building module analyzes the heating phenomenon of the composite insulator core rod-sheath interface and builds the composite insulator sheath heat transfer model according to the analysis results. When the composite insulator has heating at the core rod-sheath interface, based on the cylindrical coordinate system and according to the forward heat transfer process from the composite insulator sheath interface to the sheath surface, a two-dimensional solution model for the composite insulator sheath interface heat conduction forward problem is built to obtain the composite insulator sheath heat transfer model.

[0045] In one embodiment, the heat transfer equation of the composite insulator sheath heat transfer model is:

[0046]

[0047] In the formula, ρ is the sheath density of the composite insulator; c is the sheath specific heat capacity of the composite insulator; T is the sheath temperature of the composite insulator; τ is the time; r is the sheath polar diameter position of the composite insulator; λ is the sheath thermal conductivity of the composite insulator; θ is the sheath polar angle position of the composite insulator; is the symbol of the partial derivative; z is the ordinate parameter in the cylindrical coordinate system; q v It is the heat source inside the sheath.

[0048] In one embodiment, when the temperature relationship construction module constructs the internal and external temperature mapping relationship of the composite insulator based on the composite insulator sheath heat transfer model, the temperature relationship construction module determines the temperature distribution relationship of the composite insulator sheath in the radial direction based on the composite insulator sheath heat transfer model; when the temperature field is stable, the temperature distribution relationship of the composite insulator sheath in the radial direction is integrated, and based on the boundary conditions of the given composite insulator sheath heat transfer model, the radial temperature distribution relationship of the composite insulator sheath under the stable temperature field is solved; according to the radial temperature distribution relationship of the composite insulator sheath under the stable temperature field, based on the inner diameter of the sheath of the composite insulator, the internal and external temperature mapping relationship of the composite insulator is solved.

[0049] In one embodiment, the temperature distribution relationship of the composite insulator sheath in the radial direction is expressed as follows:

[0050]

[0051] In the formula, ρ is the sheath density of the composite insulator; c is the sheath specific heat capacity of the composite insulator; T is the sheath temperature of the composite insulator; τ is the time; r is the sheath pole position of the composite insulator; λ is the thermal conductivity of the sheath of the composite insulator; is the symbol of partial derivative; q v It is the heat source inside the sheath.

[0052] In one embodiment, under the stable temperature field state, the equation obtained by integrating the temperature distribution relationship of the composite insulator sheath in the radial direction is:

[0053] T(r)=C1lnr+C2

[0054]

[0055] Where, T is the sheath temperature of the composite insulator; τ is the time, r is the sheath pole position of the composite insulator; λ is the thermal conductivity of the sheath of the composite insulator; T w The maximum temperature outside the sheath of the composite insulator; T h is the ambient temperature; r2 is the outer diameter of the sheath of the composite insulator; h c is the convective heat dissipation coefficient of the outer side of the sheath of the composite insulator; C1 and C2 are both integral operation constants.

[0056] In one embodiment, the boundary condition equation of the composite insulator sheath heat transfer model is:

[0057] T(r2)=T w

[0058]

[0059] Where, T is the sheath temperature of the composite insulator; r is the sheath pole diameter position of the composite insulator; is the symbol of partial derivative; h c is the convection heat dissipation coefficient of the outer sheath of the composite insulator; T w The maximum temperature outside the sheath of the composite insulator; T h is the ambient temperature; r2 is the outer diameter of the sheath of the composite insulator.

[0060] In one embodiment, the equation for the radial temperature distribution relationship of the composite insulator sheath in the stable temperature field state is:

[0061]

[0062] Where, T is the sheath temperature of the composite insulator; r is the sheath pole diameter position of the composite insulator; is the sign of partial derivative; λ is the thermal conductivity of the sheath of composite insulator; h c is the convection heat dissipation coefficient of the outer sheath of the composite insulator; T w The maximum temperature outside the sheath of the composite insulator; T h is the ambient temperature; r2 is the outer diameter of the sheath of the composite insulator.

[0063] In one embodiment, the material parameters include the inner diameter of the composite insulator sheath, the outer diameter of the composite insulator sheath, the thermal conductivity of the composite insulator sheath material, and the convection heat dissipation coefficient of the composite insulator sheath outside; the environmental parameters include the ambient temperature.

[0064] In one embodiment, the equation for the mapping relationship between the internal and external temperatures of the composite insulator is:

[0065]

[0066] Where, T n is the temperature of the heat source at the composite insulator interface, T w is the maximum temperature outside the sheath of the composite insulator, r1 is the inner diameter of the sheath of the composite insulator, r2 is the outer diameter of the sheath of the composite insulator, λ is the thermal conductivity of the sheath material of the composite insulator, h c is the convection heat dissipation coefficient of the outer sheath of the composite insulator, T h is the ambient temperature.

[0067] According to a third aspect of an embodiment of the present invention, a computer device is provided.

[0068] In one embodiment, the computer device includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0069] According to a fourth aspect of embodiments of the present invention, a computer-readable storage medium is provided.

[0070] In one embodiment, the computer-readable storage medium stores a computer program, and the computer program implements the steps of the above method when executed by a processor.

[0071] The technical solution provided by the embodiment of the present invention may have the following beneficial effects:

[0072] The present invention establishes a composite insulator sheath heat transfer model based on the heating phenomenon of the composite insulator core rod-sheath interface, and derives the internal and external temperature mapping relationship of the composite insulator based on the composite insulator sheath heat transfer model. Therefore, after substituting various parameters into the internal and external temperature mapping relationship of the composite insulator, the internal heating temperature of the composite insulator can be calculated, providing technical support for the operation and maintenance of the power grid department, so as to clarify the operating status of the heating composite insulator, avoid missing the disposal opportunity due to misjudgment, and prevent serious power grid safety accidents such as composite insulator breakage.

[0073] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0075] Figure 1 It is a flow chart showing a method for calculating the temperature of a heat source at an interface of a composite insulator according to an exemplary embodiment;

[0076] Figure 2 It is a structural block diagram of a composite insulator interface heat source temperature calculation system according to an exemplary embodiment;

[0077] Figure 3 is a schematic diagram of a heat transfer model of a composite insulator sheath according to an exemplary embodiment;

[0078] Figure 4 It is a schematic diagram showing the structure of a computer device according to an exemplary embodiment. DETAILED DESCRIPTION

[0079] The following description and accompanying drawings fully illustrate the specific embodiments of this article so that those skilled in the art can practice them. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The scope of the embodiments of this article includes the entire scope of the claims, as well as all available equivalents of the claims. Herein, the terms "first", "second", etc. are only used to distinguish one element from another, without requiring or implying any actual relationship or order between these elements. In fact, the first element can also be called the second element, and vice versa. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the structure, device or equipment including a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also include elements inherent to such structure, device or equipment. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the structure, device or equipment including the elements. Each embodiment is described in a progressive manner herein, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other.

[0080] The terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used herein to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this article and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description herein, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, it can also be the internal connection of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0081] As used herein, the term "plurality" means two or more than two, unless otherwise specified.

[0082] In this document, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0083] In this article, the term "and / or" is a description of the association relationship between objects, indicating that three relationships may exist. For example, A and / or B means: A or B, or, A and B.

[0084] It should be understood that, although the various steps in the flow chart are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the figure may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0085] Each module in the device or system of the present application can be implemented in whole or in part by software, hardware, or a combination thereof. The above modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to the above modules.

[0086] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0087] Figure 1An embodiment of a method for calculating the temperature of a heat source at an interface of a composite insulator according to the present invention is shown.

[0088] In this optional embodiment, the method for calculating the temperature of the heat source at the composite insulator interface includes:

[0089] Step S101, analyzing the heating phenomenon at the composite insulator core rod-sheath interface, and establishing a composite insulator sheath heat transfer model according to the analysis results;

[0090] Step S103, based on the composite insulator sheath heat transfer model, constructing a mapping relationship between the internal and external temperatures of the composite insulator; wherein the mapping relationship between the internal and external temperatures of the composite insulator is a linear function relationship formed by the temperature of the heat source at the composite insulator interface and the surface temperature of the composite insulator sheath, material parameters, and environmental parameters;

[0091] Step S105, obtaining the current surface temperature, material parameters and environmental parameters of the composite insulator sheath, and calculating the current composite insulator interface heat source temperature based on the mapping relationship between the internal and external temperatures of the composite insulator.

[0092] Figure 2 An embodiment of a composite insulator interface heat source temperature calculation system of the present invention is shown.

[0093] In this optional embodiment, the composite insulator interface heat source temperature calculation system includes:

[0094] The heat transfer model building module 201 is used to analyze the heating phenomenon of the composite insulator core rod-sheath interface and build a composite insulator sheath heat transfer model according to the analysis results;

[0095] The temperature relationship building module 203 is used to build a temperature mapping relationship between the inside and outside of the composite insulator based on the composite insulator jacket heat transfer model; wherein the temperature mapping relationship between the inside and outside of the composite insulator is a linear function relationship formed by the temperature of the heat source at the composite insulator interface and the surface temperature of the composite insulator jacket, material parameters, and environmental parameters;

[0096] The interface temperature calculation module 205 is used to obtain the current composite insulator sheath surface temperature and material parameters and environmental parameters, and calculate the current composite insulator interface heat source temperature based on the composite insulator internal and external temperature mapping relationship.

[0097] In the above optional embodiment, if Figure 3As shown, when the heating phenomenon of the composite insulator core rod-sheath interface is analyzed and a composite insulator sheath heat transfer model is established according to the analysis results, when the composite insulator core rod-sheath interface heats up, based on the cylindrical coordinate system and according to the forward heat transfer process from the composite insulator sheath interface to the sheath surface, a two-dimensional solution model for the composite insulator sheath interface heat conduction positive problem is established to obtain the composite insulator sheath heat transfer model.

[0098] When constructing the temperature mapping relationship between the inside and outside of the composite insulator based on the composite insulator sheath heat transfer model, the temperature distribution relationship of the composite insulator sheath in the radial direction can be determined based on the composite insulator sheath heat transfer model; under the stable state of the temperature field, the temperature distribution relationship of the composite insulator sheath in the radial direction is integrated, and based on the boundary conditions of the given composite insulator sheath heat transfer model, the radial temperature distribution relationship of the composite insulator sheath under the stable state of the temperature field is solved; according to the radial temperature distribution relationship of the composite insulator sheath under the stable state of the temperature field, based on the inner diameter of the sheath of the composite insulator, the temperature mapping relationship between the inside and outside of the composite insulator is solved.

[0099] Among them, the heat transfer equation of the composite insulator sheath heat transfer model is:

[0100]

[0101] In the formula, ρ is the sheath density of the composite insulator; c is the sheath specific heat capacity of the composite insulator; T is the sheath temperature of the composite insulator; τ is the time; r is the sheath polar diameter position of the composite insulator; λ is the sheath thermal conductivity of the composite insulator; θ is the sheath polar angle position of the composite insulator; is the symbol of the partial derivative; z is the ordinate parameter in the cylindrical coordinate system; q v It is the heat source inside the sheath.

[0102] The equation for the temperature distribution relationship of the composite insulator sheath in the radial direction is:

[0103]

[0104] In the formula, ρ is the sheath density of the composite insulator; c is the sheath specific heat capacity of the composite insulator; T is the sheath temperature of the composite insulator; τ is the time; r is the sheath pole position of the composite insulator; λ is the thermal conductivity of the sheath of the composite insulator; is the symbol of partial derivative; q v It is the heat source inside the sheath.

[0105] Since there is no heat source inside the sheath, q v = 0. When the temperature field tends to be stable, So we get right By performing the integral operation, the equation obtained is: T(r) = C1lnr + C2; the equation for setting the boundary condition of the composite insulator sheath heat transfer model is: T(r2) = T w ; Substitute the boundary conditions of the composite insulator sheath heat transfer model into the equation T(r)=C1lnr+C2 to obtain constants C1 and C2; where In the above formula, T is the sheath temperature of the composite insulator; τ is the time, r is the sheath pole position of the composite insulator; λ is the thermal conductivity of the sheath of the composite insulator; T w The maximum temperature outside the sheath of the composite insulator; T h is the ambient temperature; r2 is the outer diameter of the sheath of the composite insulator; h c is the convection heat dissipation coefficient of the outer side of the sheath of the composite insulator; is the symbol of partial derivative; T w is the maximum temperature outside the sheath of the composite insulator; r2 is the outer diameter of the sheath of the composite insulator; C1 and C2 are both integral operation constants.

[0106] Substituting the boundary conditions of the composite insulator sheath heat transfer model into the equation obtained by integrating the temperature distribution relationship of the composite insulator sheath in the radial direction, the equation for the radial temperature distribution relationship of the composite insulator sheath under the stable temperature field state is:

[0107]

[0108] Where, T is the sheath temperature of the composite insulator; r is the sheath pole diameter position of the composite insulator; is the sign of partial derivative; λ is the thermal conductivity of the sheath of composite insulator; h c is the convection heat dissipation coefficient of the outer sheath of the composite insulator; T w The maximum temperature outside the sheath of the composite insulator; T h is the ambient temperature; r2 is the outer diameter of the sheath of the composite insulator.

[0109] At this time, when r = r1, the equation for the mapping relationship between the internal and external temperatures of the composite insulator can be obtained as follows: After sorting, we get Where, T n is the temperature of the heat source at the composite insulator interface, T w is the maximum temperature outside the sheath of the composite insulator, r1 is the inner diameter of the sheath of the composite insulator, r2 is the outer diameter of the sheath of the composite insulator, λ is the thermal conductivity of the sheath material of the composite insulator, h c is the convection heat dissipation coefficient of the outer sheath of the composite insulator, T h is the ambient temperature.

[0110] From the equation of the internal and external temperature mapping relationship of the composite insulator, it can be seen that the internal and external temperature mapping relationship of the sheath of the interface heating composite insulator is related to the inner diameter of the sheath, the outer diameter of the sheath, the thermal conductivity of the sheath material, the convection heat dissipation coefficient of the outer side of the sheath, and the ambient temperature. When all the parameters are determined, the internal and external temperatures of the composite insulator sheath are in a linear function relationship.

[0111] The inner diameter of the sheath, the outer diameter of the sheath, and the thermal conductivity of the sheath material can be obtained from the composite insulator manufacturer. The ambient temperature and the maximum temperature outside the sheath can be measured on site (the long-distance infrared temperature measurement results are usually smaller than the actual temperature value of the object. A high-precision lens can be used to ensure the accuracy of the maximum temperature measurement results outside the sheath). However, the convective heat dissipation coefficient outside the sheath will be affected by wind speed. In windless conditions, the convective heat dissipation coefficient can be taken as 12W / (m2·℃). In windy conditions, the convective heat dissipation coefficient needs to be calculated according to the empirical formula. The empirical formula is as follows:

[0112] h c =Bv n (v>0.15m / s)

[0113] In the formula, B and v are coefficients of the empirical formula, which are fitted from a large amount of test data and used to solve h c The numerical value of; B = 18.3; n = 0.5.

[0114] After obtaining various parameters, the maximum temperature of the outer sheath is measured, and its value is substituted into the mapping relationship expression of the inner and outer temperatures of the interface heating composite insulator sheath to obtain the temperature at the heat source of the composite insulator interface.

[0115] Figure 4 An embodiment of a computer device of the present invention is shown. The computer device may be a server, and the computer device includes a processor, a memory, and a network interface connected via a system bus. The processor of the computer device is used 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, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store static information and dynamic information data. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, the steps in the above method embodiment are implemented.

[0116] Those skilled in the art will understand that Figure 4The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present invention, and does not constitute a limitation on the computer device to which the solution of the present invention is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0117] In addition, the present invention also provides the above-mentioned computer device, which includes a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiment when executing the computer program.

[0118] In addition, the present invention further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps in the above method embodiment are implemented.

[0119] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided by the present invention can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0120] The present invention is not limited to the structures which have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A method for calculating the temperature of a heat source at a composite insulator interface, characterized in that: include: The heating phenomenon at the composite insulator core rod-sheath interface is analyzed, and a composite insulator sheath heat transfer model is established based on the analysis results. Based on the composite insulator sheath heat transfer model, a mapping relationship between the internal and external temperatures of the composite insulator is constructed; wherein the mapping relationship between the internal and external temperatures of the composite insulator is a linear function relationship between the temperature of the heat source at the composite insulator interface and the surface temperature of the composite insulator sheath, material parameters, and environmental parameters; The current composite insulator sheath surface temperature, material parameters and environmental parameters are obtained, and based on the mapping relationship between the internal and external temperatures of the composite insulator, the current composite insulator interface heat source temperature is calculated.

2. The method for calculating the temperature of the heat source at the composite insulator interface according to claim 1, characterized in that: The heating phenomenon of the composite insulator core rod-sheath interface is analyzed, and the composite insulator sheath heat transfer model is established based on the analysis results, including: When the composite insulator has heating at the core rod-sheath interface, based on the cylindrical coordinate system and according to the forward heat transfer process from the composite insulator-sheath interface to the sheath surface, a two-dimensional solution model for the composite insulator-sheath interface heat conduction problem is established, and a composite insulator-sheath heat transfer model is obtained. Among them, the heat transfer equation of the composite insulator sheath heat transfer model is: In the formula, ρ is the sheath density of the composite insulator; c is the sheath specific heat capacity of the composite insulator; T is the sheath temperature of the composite insulator; τ is the time; r is the sheath polar diameter position of the composite insulator; λ is the sheath thermal conductivity of the composite insulator; θ is the sheath polar angle position of the composite insulator; is the symbol of the partial derivative; z is the ordinate parameter in the cylindrical coordinate system; q v It is the heat source inside the sheath.

3. The method for calculating the temperature of the heat source at the composite insulator interface according to claim 2, characterized in that: Based on the composite insulator sheath heat transfer model, constructing the internal and external temperature mapping relationship of the composite insulator includes: Based on the composite insulator sheath heat transfer model, determining the temperature distribution relationship of the composite insulator sheath in the radial direction; In a stable temperature field state, integrating the temperature distribution relationship of the composite insulator sheath in the radial direction, and solving the radial temperature distribution relationship of the composite insulator sheath in a stable temperature field state based on the boundary conditions of a given composite insulator sheath heat transfer model; According to the radial temperature distribution relationship of the composite insulator sheath under the stable temperature field state and based on the inner diameter of the composite insulator sheath, the mapping relationship between the internal and external temperatures of the composite insulator is solved.

4. The method for calculating the temperature of the heat source at the composite insulator interface according to claim 3, characterized in that: The equation for the temperature distribution relationship of the composite insulator sheath in the radial direction is: In the formula, ρ is the sheath density of the composite insulator; c is the sheath specific heat capacity of the composite insulator; T is the sheath temperature of the composite insulator; τ is the time; r is the sheath pole position of the composite insulator; λ is the thermal conductivity of the sheath of the composite insulator; is the symbol of partial derivative; q v It is the heat source inside the sheath.

5. The method for calculating the temperature of the heat source at the composite insulator interface according to claim 4, characterized in that: Under the stable temperature field condition, the equation obtained by integrating the temperature distribution relationship of the composite insulator sheath in the radial direction is: T(r)=C1lnr+C2 Where, T is the sheath temperature of the composite insulator; τ is the time, r is the sheath pole position of the composite insulator; λ is the thermal conductivity of the sheath of the composite insulator; T w The maximum temperature outside the sheath of the composite insulator; T h is the ambient temperature; r2 is the outer diameter of the sheath of the composite insulator; h c is the convective heat dissipation coefficient of the outer side of the sheath of the composite insulator; C1 and C2 are both integral operation constants.

6. The method for calculating the temperature of the heat source at the composite insulator interface according to claim 5, characterized in that: The equation of the boundary condition of the composite insulator sheath heat transfer model is: T(r2)=T w Where, T is the sheath temperature of the composite insulator; r is the sheath pole diameter position of the composite insulator; is the symbol of partial derivative; h c is the convection heat dissipation coefficient of the outer sheath of the composite insulator; T w The maximum temperature outside the sheath of the composite insulator; T h is the ambient temperature; r2 is the outer diameter of the sheath of the composite insulator; The equation for the radial temperature distribution of the composite insulator sheath under the stable temperature field is: Where, T is the sheath temperature of the composite insulator; r is the sheath pole diameter position of the composite insulator; is the sign of partial derivative; λ is the thermal conductivity of the sheath of composite insulator; h c is the convection heat dissipation coefficient of the outer sheath of the composite insulator; T w The maximum temperature outside the sheath of the composite insulator; T h is the ambient temperature; r2 is the outer diameter of the sheath of the composite insulator.

7. The method for calculating the temperature of the heat source at the composite insulator interface according to claim 6, characterized in that: The material parameters include the inner diameter of the composite insulator sheath, the outer diameter of the composite insulator sheath, the thermal conductivity of the composite insulator sheath material, and the convection heat dissipation coefficient of the composite insulator sheath outside; the environmental parameters include the ambient temperature; Moreover, the equation for the mapping relationship between the internal and external temperatures of the composite insulator is: Where, T n is the temperature of the heat source at the composite insulator interface, T w is the maximum temperature outside the sheath of the composite insulator, r1 is the inner diameter of the sheath of the composite insulator, r2 is the outer diameter of the sheath of the composite insulator, λ is the thermal conductivity of the sheath material of the composite insulator, h c is the convection heat dissipation coefficient of the outer sheath of the composite insulator, T h is the ambient temperature.

8. A composite insulator interface heat source temperature calculation system, characterized in that: include: The heat transfer model building module is used to analyze the heating phenomenon at the composite insulator core rod-sheath interface and build a composite insulator sheath heat transfer model based on the analysis results; A temperature relationship building module is used to build a temperature mapping relationship between the inside and outside of a composite insulator based on the composite insulator sheath heat transfer model; wherein the temperature mapping relationship between the inside and outside of the composite insulator is a linear function relationship between the temperature of the heat source at the composite insulator interface and the surface temperature of the composite insulator sheath, material parameters, and environmental parameters; The interface temperature calculation module is used to obtain the current composite insulator sheath surface temperature and material parameters and environmental parameters, and based on the mapping relationship between the internal and external temperatures of the composite insulator, calculate the current composite insulator interface heat source temperature.

9. The composite insulator interface heat source temperature calculation system according to claim 8, characterized in that: The heat transfer model establishment module analyzes the heating phenomenon of the composite insulator core rod-sheath interface and establishes the composite insulator sheath heat transfer model according to the analysis results. When the composite insulator core rod-sheath interface heats up, based on the cylindrical coordinate system and according to the forward heat transfer process from the composite insulator sheath interface to the sheath surface, a two-dimensional solution model for the composite insulator sheath interface heat conduction forward problem is established to obtain the composite insulator sheath heat transfer model. Among them, the heat transfer equation of the composite insulator sheath heat transfer model is: In the formula, ρ is the sheath density of the composite insulator; c is the sheath specific heat capacity of the composite insulator; T is the sheath temperature of the composite insulator; τ is the time; r is the sheath polar diameter position of the composite insulator; λ is the sheath thermal conductivity of the composite insulator; θ is the sheath polar angle position of the composite insulator; is the symbol of the partial derivative; z is the ordinate parameter in the cylindrical coordinate system; q v It is the heat source inside the sheath.

10. The composite insulator interface heat source temperature calculation system according to claim 9, characterized in that: When the temperature relationship construction module constructs the internal and external temperature mapping relationship of the composite insulator based on the composite insulator sheath heat transfer model, the temperature relationship construction module determines the temperature distribution relationship of the composite insulator sheath in the radial direction based on the composite insulator sheath heat transfer model; when the temperature field is stable, the temperature distribution relationship of the composite insulator sheath in the radial direction is integrated, and based on the boundary conditions of the given composite insulator sheath heat transfer model, the radial temperature distribution relationship of the composite insulator sheath under the stable temperature field is solved; according to the radial temperature distribution relationship of the composite insulator sheath under the stable temperature field, based on the inner diameter of the sheath of the composite insulator, the internal and external temperature mapping relationship of the composite insulator is solved.

11. The composite insulator interface heat source temperature calculation system according to claim 10, characterized in that: The equation for the temperature distribution relationship of the composite insulator sheath in the radial direction is: In the formula, ρ is the sheath density of the composite insulator; c is the sheath specific heat capacity of the composite insulator; T is the sheath temperature of the composite insulator; τ is the time; r is the sheath pole position of the composite insulator; λ is the thermal conductivity of the sheath of the composite insulator; is the symbol of partial derivative; q v It is the heat source inside the sheath.

12. The composite insulator interface heat source temperature calculation system according to claim 11, characterized in that: Under the stable temperature field condition, the equation obtained by integrating the temperature distribution relationship of the composite insulator sheath in the radial direction is: T(r)=C1lnr+C2 Where, T is the sheath temperature of the composite insulator; τ is the time, r is the sheath pole position of the composite insulator; λ is the thermal conductivity of the sheath of the composite insulator; T w The maximum temperature outside the sheath of the composite insulator; T h is the ambient temperature; r2 is the outer diameter of the sheath of the composite insulator; h c is the convective heat dissipation coefficient of the outer side of the sheath of the composite insulator; C1 and C2 are both integral operation constants.

13. The composite insulator interface heat source temperature calculation system according to claim 12, characterized in that: The equation of the boundary condition of the composite insulator sheath heat transfer model is: T(r2)=T w Where, T is the sheath temperature of the composite insulator; r is the sheath pole diameter position of the composite insulator; is the symbol of partial derivative; h c is the convection heat dissipation coefficient of the outer sheath of the composite insulator; T w The maximum temperature outside the sheath of the composite insulator; T h is the ambient temperature; r2 is the outer diameter of the sheath of the composite insulator; The equation for the radial temperature distribution of the composite insulator sheath under the stable temperature field is: Where, T is the sheath temperature of the composite insulator; r is the sheath pole diameter position of the composite insulator; is the sign of partial derivative; λ is the thermal conductivity of the sheath of composite insulator; h c is the convection heat dissipation coefficient of the outer sheath of the composite insulator; T w The maximum temperature outside the sheath of the composite insulator; T h is the ambient temperature; r2 is the outer diameter of the sheath of the composite insulator.

14. The composite insulator interface heat source temperature calculation system according to claim 13, characterized in that: The material parameters include the inner diameter of the composite insulator sheath, the outer diameter of the composite insulator sheath, the thermal conductivity of the composite insulator sheath material, and the convection heat dissipation coefficient of the composite insulator sheath outside; the environmental parameters include the ambient temperature; Moreover, the equation for the mapping relationship between the internal and external temperatures of the composite insulator is: Where, T n is the temperature of the heat source at the composite insulator interface, T w is the maximum temperature outside the sheath of the composite insulator, r1 is the inner diameter of the sheath of the composite insulator, r2 is the outer diameter of the sheath of the composite insulator, λ is the thermal conductivity of the sheath material of the composite insulator, h c is the convection heat dissipation coefficient of the outer sheath of the composite insulator, T h is the ambient temperature.

15. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

16. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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