CN111985075A - Temperature distribution calculation method and system suitable for zinc oxide arrester - Google Patents

Abstract

The invention provides a temperature distribution calculation method and system suitable for a zinc oxide arrester, which convert the sunlight radiation and the wind speed into corresponding boundary conditions to be applied to a temperature field simulation model, so that the temperature distribution rule of an extra-high voltage arrester under the influence of external environmental factors can be researched and analyzed without carrying out a temperature rise test with long period and large error, and technical support is provided for infrared temperature measurement and fault diagnosis of the arrester.

Description

Temperature distribution calculation method and system suitable for zinc oxide arrester

technical field

The present disclosure belongs to the field of high-voltage equipment state detection, and relates to a temperature distribution calculation method and system suitable for zinc oxide arresters.

Background technique

The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art.

Zinc oxide arresters are important overvoltage protection equipment in UHV substations, and are generally arranged on the main transformer and line outlet sides of GIS. When the internal resistance sheet of the arrester is damp and deteriorated, it will cause the change of the surface temperature characteristics, so that the operation status of the UHV arrester can be diagnosed by means of infrared temperature measurement.

However, the arrester is a voltage-induced heating device, which has the characteristics of small heat generation and low surface temperature rise, and its surface temperature is also affected by external environmental factors, such as light intensity, wind strength, etc., which will inevitably give infrared temperature measurement and fault diagnosis. It will bring difficulties. If you wait for suitable environmental conditions, the work efficiency will be reduced, and even the defects will not be found in time. Therefore, it is necessary to study the internal and external temperature distribution characteristics of the UHV arrester under the influence of external environmental factors.

The traditional lightning arrester temperature rise test is usually carried out in the test hall. The test period is long and there are many error factors, and it is impossible to truly simulate the outdoor field operating environment. If the simulation software can be used to establish a lightning arrester temperature field that comprehensively considers the influence of wind speed, sunlight and other factors The calculation model can quickly and accurately study and analyze the internal and external temperature distribution law of the arrester under the influence of external environmental factors.

SUMMARY OF THE INVENTION

In order to solve the above problems, the present disclosure proposes a temperature distribution calculation method and system suitable for zinc oxide arresters. The present disclosure converts sunlight radiation and wind speed into corresponding boundary conditions and applies them to the temperature field simulation model, so that no The temperature rise test with long cycle and large error can study and analyze the temperature distribution law of UHV arrester under the influence of external environmental factors, and provide technical support for the infrared temperature measurement and fault diagnosis of the arrester.

According to some embodiments, the present disclosure adopts the following technical solutions:

A temperature distribution calculation method suitable for zinc oxide arresters. In the temperature field calculation process, the sunlight radiation and wind speed are converted into corresponding boundary conditions and applied to the temperature field simulation model, and the calculation is performed to obtain the temperature distribution of each position. .

As an optional embodiment, the boundary conditions include applying convection boundary conditions to the interface between the outside of the arrester and air, applying solar radiation boundary conditions to the light side of the arrester, and applying interface continuous boundary conditions to the interfaces of other parts of the arrester.

As an optional embodiment, before the temperature field calculation process, an electric field calculation process is also included, which specifically includes:

(1-1) Apply corresponding electric field boundary conditions to different parts of the arrester;

(1-2) Assign values to the dielectric constant and resistivity of each part of the arrester;

(1-3) Perform electric field simulation calculation on the arrester, and use the voltage and current data obtained from the simulation to calculate the leakage current heat generation and the dielectric loss heat generation.

As an optional implementation manner, in the step (1-1), the electric field boundary conditions include:

The first type of boundary conditions are applied to the equalizing ring and the base. The potential is a known quantity. The potential of the equalizing ring is the operating voltage and the base potential is 0V;

As an optional implementation manner, the specific steps of the temperature field calculation process are:

(2-1) Taking the leakage current heat generation and dielectric loss heat generation calculated by the electric field as the heat source, the arrester satisfies the Poisson equation in the entire temperature field calculation area;

(2-2) Apply corresponding thermal conduction boundary conditions to different parts of the arrester;

(2-3) Assign values to the thermal conductivity of each part of the arrester and the convective heat transfer coefficient and radiation coefficient of its surface;

(2-4) The temperature field simulation calculation is performed on the arrester, and the temperature distribution of each position is obtained by solving.

A temperature distribution calculation system suitable for zinc oxide arresters, comprising:

The electric field calculation module is configured to perform electric field simulation calculation for the arrester, and use the voltage and current data obtained from the simulation to calculate the leakage current heat generation and the dielectric loss heat generation;

The temperature field calculation module is configured to combine the leakage current heat generation and the dielectric loss heat generation, convert the sunlight radiation and wind speed into corresponding boundary conditions and apply them to the temperature field simulation model, perform calculation, and solve the temperature distribution of each position.

As an optional implementation manner, the electric field calculation module includes:

The first boundary condition applying module is configured to apply corresponding electric field boundary conditions to different parts of the arrester;

The first assignment module is configured to assign values to the dielectric constant and resistivity of each part of the arrester;

The first simulation calculation module is configured to perform electric field simulation calculation on the arrester, and use the voltage and current data obtained by the simulation to calculate the leakage current heat generation and the dielectric loss heat generation.

As an optional implementation manner, the temperature field calculation module includes:

The heat source building block is configured to use the leakage current heat generation and the dielectric loss heat generation calculated by the electric field as the heat source;

The second boundary condition applying module is configured to apply corresponding heat conduction boundary conditions to different parts of the arrester;

The second assignment module is configured to assign assignments to the thermal conductivity of each part of the arrester and the convective heat transfer coefficient and radiation coefficient of its surface;

The second simulation calculation module is configured to perform simulation calculation on the temperature field of the arrester, and obtain the temperature distribution of each position by solving.

A computer-readable storage medium stores a plurality of instructions, and the instructions are adapted to be loaded by a processor of a terminal device and execute the temperature distribution calculation method applicable to a zinc oxide arrester.

A terminal device includes a processor and a computer-readable storage medium, where the processor is used to implement various instructions; the computer-readable storage medium is used to store a plurality of instructions, and the instructions are suitable for being loaded and executed by the processor. Calculation method of temperature distribution of zinc oxide arrester.

A method for identifying faults of an arrester, which uses the temperature distribution obtained by the above-mentioned temperature distribution calculation method applicable to a zinc oxide arrester to determine whether each part fails.

Compared with the prior art, the beneficial effects of the present disclosure are:

1. The calculation speed is fast and the efficiency is high, which avoids the shortcomings of long on-site temperature rise test cycle, waste of manpower and material resources, and many error factors. At the same time, the thermoelectric coupling method is used to calculate the temperature distribution of the zinc oxide arrester, and the power loss value calculated from the electric field simulation results is used as the heat source of the temperature field simulation, which has high accuracy.

2. The environmental factors such as wind speed and light intensity in the operating environment can be easily simulated, and the temperature distribution of the zinc oxide arrester under the influence of different environmental factors can be studied and analyzed conveniently and quickly only by modifying the corresponding boundary conditions.

3. The operating status of the zinc oxide arrester can be set at will, damp, deteriorated, dirty, etc. The conclusions drawn have certain reference significance for infrared temperature measurement and fault identification in non-ideal environments, and have good practical application value and promotion value. .

Description of drawings

The accompanying drawings that constitute a part of the present disclosure are used to provide further understanding of the present disclosure, and the exemplary embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure.

Fig. 1 is the structural schematic diagram of the zinc oxide arrester of the present embodiment;

Figures 2(a) and 2(b) are schematic diagrams of the temperature distribution of the arrester under different conditions of this embodiment;

Figure 3 (a)-(d) is a schematic diagram of the temperature distribution of the arrester under the influence of different wind speeds in this embodiment;

FIG. 4 is a flow chart of the method for calculating the electric field and the temperature field of the zinc oxide arrester according to the embodiment of the present application.

Detailed ways:

The present disclosure will be further described below with reference to the accompanying drawings and embodiments.

It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present disclosure. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and/or combinations thereof.

A simulation calculation method suitable for the temperature distribution of zinc oxide arresters, as shown in Figure 4, includes the electric field calculation process and the temperature field calculation process.

(1) The specific steps of the electric field calculation process are:

(1-1) There is no charge excitation source inside or outside the arrester during operation, so the Laplace equation is satisfied in the entire calculation area.

(1-2) Apply the corresponding electric field boundary conditions to different parts of the arrester: the first type of boundary conditions are applied to the voltage equalizing ring and the base, the potential of which is a known quantity, the voltage equalizing ring potential is the operating voltage, and the base potential is 0V; the rest The interface continuous boundary condition is applied to each part interface.

(1-3) Assign values to the dielectric constant and resistivity of each part of the arrester.

(1-4) Perform electric field simulation calculation on the arrester, and use the voltage and current data obtained by the simulation to further calculate the leakage current heating P _l and the dielectric loss heating P _j .

(2) The specific steps of the temperature field calculation process are:

(2-1) Taking the leakage current heating P _l and the dielectric loss heating P _j calculated by the electric field as the heat source, the arrester satisfies the Poisson equation in the entire temperature field calculation area.

(2-2) Apply corresponding heat conduction boundary conditions to different parts of the arrester: apply convection boundary conditions to the interface between the outside of the arrester and the air; apply solar radiation boundary conditions to the light side of the arrester; apply continuous boundary conditions to the interface of the rest of the parts .

(2-3) Assign values to the thermal conductivity of each part of the arrester and the convective heat transfer coefficient and radiation coefficient of its surface.

(2-4) The temperature field simulation calculation is performed on the arrester, and the temperature distribution of each position is obtained by solving.

As a typical embodiment, as shown in Figure 1, the 1000kV zinc oxide arrester is mainly composed of a voltage equalizing ring, a base and 5 arrester sections connected in series. The temperature field simulation shows that the temperature distribution of the arrester during normal operation and the overall deterioration of the second section of the resistor is shown in Figure 2(a), (b).

When the arrester is in normal operation, the temperature distribution on the outer surface is relatively uniform, the maximum temperature is 17.7°C, and the temperature rise is less than 0.2K. When the second section of the arrester is overall degraded, the first section and the third section have local high temperatures. This is because the voltage of the deteriorating resistors decreases, so that the two adjacent sections bear a higher voltage, resulting in an increase in temperature. At this time, the maximum temperature of the outer surface of the arrester is 20.4°C, and the temperature rise is about 2.3K.

Change the convective boundary conditions of the interface between the 1000kV zinc oxide arrester and the air, and the simulation calculation obtains the temperature distribution of the arrester under the influence of different wind speeds (respectively 1m/s, 3m/s, 6m/s, 9m/s) as shown in Figure 3(a)- (d).

The increase of wind speed strengthens the air convection heat dissipation, so that the maximum surface temperature of the arrester caused by the heating of the internal defect decreases, and the temperature rise decreases, and may even be lower than the judgment threshold of the infrared temperature measurement defect of the arrester. Therefore, if the infrared temperature measurement is carried out when the wind speed is high, It may be difficult to detect defects in time.

In addition, the operating status of the zinc oxide arrester and various environmental factors in operation can be set at will, which is conducive to scientific research and engineering simulation, and has good practical application value and promotion value.

The following product examples or application examples are also provided:

A temperature distribution calculation system suitable for zinc oxide arresters, comprising:

The electric field calculation module is configured to perform electric field simulation calculation for the arrester, and use the voltage and current data obtained from the simulation to calculate the leakage current heat generation and the dielectric loss heat generation;

The temperature field calculation module is configured to combine the leakage current heat generation and the dielectric loss heat generation, convert the sunlight radiation and wind speed into corresponding boundary conditions and apply them to the temperature field simulation model, perform calculation, and solve the temperature distribution of each position.

As an optional implementation manner, the electric field calculation module includes:

The first boundary condition applying module is configured to apply corresponding electric field boundary conditions to different parts of the arrester;

The first assignment module is configured to assign values to the dielectric constant and resistivity of each part of the arrester;

The first simulation calculation module is configured to perform electric field simulation calculation on the arrester, and use the voltage and current data obtained by the simulation to calculate the leakage current heat generation and the dielectric loss heat generation.

As an optional implementation manner, the temperature field calculation module includes:

The heat source building block is configured to use the leakage current heat generation and the dielectric loss heat generation calculated by the electric field as the heat source;

The second boundary condition applying module is configured to apply corresponding heat conduction boundary conditions to different parts of the arrester;

The second assignment module is configured to assign assignments to the thermal conductivity of each part of the arrester and the convective heat transfer coefficient and radiation coefficient of its surface;

The second simulation calculation module is configured to perform simulation calculation on the temperature field of the arrester, and obtain the temperature distribution of each position by solving.

A computer-readable storage medium stores a plurality of instructions, and the instructions are adapted to be loaded by a processor of a terminal device and execute the temperature distribution calculation method applicable to a zinc oxide arrester.

A terminal device includes a processor and a computer-readable storage medium, where the processor is used to implement various instructions; the computer-readable storage medium is used to store a plurality of instructions, and the instructions are suitable for being loaded and executed by the processor. Calculation method of temperature distribution of zinc oxide arrester.

A method for identifying faults of an arrester, which uses the temperature distribution obtained by the above-mentioned temperature distribution calculation method applicable to a zinc oxide arrester to determine whether each part fails.

As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flows of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

The above descriptions are only preferred embodiments of the present disclosure, and are not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure should be included within the protection scope of the present disclosure.

Although the specific embodiments of the present disclosure have been described above in conjunction with the accompanying drawings, they do not limit the protection scope of the present disclosure. Those skilled in the art should understand that on the basis of the technical solutions of the present disclosure, those skilled in the art do not need to pay creative efforts. Various modifications or variations that can be made are still within the protection scope of the present disclosure.

Claims (10)

1. A temperature distribution calculation method suitable for a zinc oxide arrester is characterized by comprising the following steps: in the temperature field calculation process, the solar radiation and the wind speed are converted into corresponding boundary conditions to be applied to a temperature field simulation model for calculation, and the temperature distribution of each position is obtained through solving.

2. The method for calculating the temperature distribution of the zinc oxide arrester according to claim 1, wherein the method comprises the following steps: the boundary conditions include a convection boundary condition applied to an interface between the exterior of the arrester and air, a solar radiation boundary condition applied to a light side by the arrester, and an interface continuity boundary condition applied to interfaces of the rest of the arrester.

3. The method for calculating the temperature distribution of the zinc oxide arrester according to claim 1, wherein the method comprises the following steps: before the temperature field calculation process, an electric field calculation process is also included, and the method specifically comprises the following steps:

(1-1) applying corresponding electric field boundary conditions to different parts of the lightning arrester;

(1-2) assigning values to the dielectric constant and the resistivity of each part of the lightning arrester;

and (1-3) carrying out electric field simulation calculation on the lightning arrester, and calculating the leakage current heating and the dielectric loss heating by using voltage and current data obtained by simulation.

4. The method for calculating the temperature distribution of the zinc oxide arrester according to claim 3, wherein the method comprises the following steps: in the step (1-1), the electric field boundary conditions include:

applying a first class of boundary conditions to the equalizing ring and the base, wherein the potential of the equalizing ring is a known quantity, the potential of the equalizing ring is an operating voltage, and the potential of the base is 0V; the remaining portions of the interface impose an interface continuity boundary condition.

5. The method for calculating the temperature distribution of the zinc oxide arrester according to claim 1, wherein the method comprises the following steps: the temperature field calculation process comprises the following specific steps:

(2-1) taking leakage current heating and dielectric loss heating obtained by electric field calculation as heat sources, wherein the lightning arrester meets the Poisson equation in the whole temperature field calculation region;

(2-2) applying corresponding thermal conduction boundary conditions to different parts of the lightning arrester;

(2-3) assigning values to the heat conductivity coefficient of each part of the lightning arrester, the convection heat transfer coefficient and the radiation coefficient of the surface of the lightning arrester;

and (2-4) carrying out temperature field simulation calculation on the lightning arrester, and solving to obtain the temperature distribution of each position.

6. The utility model provides a temperature distribution calculation system suitable for zinc oxide arrester which characterized by: the method comprises the following steps:

the electric field calculation module is configured to perform electric field simulation calculation on the lightning arrester, and calculate leakage current heating and dielectric loss heating by using voltage and current data obtained by simulation;

and the temperature field calculation module is configured to convert the solar radiation and the wind speed into corresponding boundary conditions and apply the boundary conditions to the temperature field simulation model in combination with the leakage current heating and the dielectric loss heating, calculate and solve the temperature distribution of each position.

7. The temperature distribution calculation system for the zinc oxide lightning arrester according to claim 6, characterized in that: the electric field calculation module includes:

a first boundary condition applying module configured to apply respective electric field boundary conditions to different parts of the arrester;

the first assignment module is configured to assign dielectric constants and resistivity of all parts of the lightning arrester;

and the first simulation calculation module is configured to perform electric field simulation calculation on the lightning arrester, and calculate the leakage current heating and the dielectric loss heating by using voltage and current data obtained by simulation.

8. The temperature distribution calculation system for the zinc oxide lightning arrester according to claim 6, characterized in that: the temperature field calculation module includes:

the heat source construction module is configured to use the leakage current heating and the dielectric loss heating obtained by electric field calculation as a heat source;

a second boundary condition applying module configured to apply respective thermal conduction boundary conditions to different parts of the arrester;

the second assignment module is configured to assign values to the heat conductivity coefficient of each part of the lightning arrester, the convective heat transfer coefficient of the surface of the lightning arrester and the radiation coefficient of the surface of the lightning arrester;

and the second simulation calculation module is configured to perform temperature field simulation calculation on the lightning arrester, and solve the temperature distribution of each position.

9. A computer-readable storage medium characterized by: a plurality of instructions are stored, wherein the instructions are suitable for being loaded by a processor of a terminal device and executing the temperature distribution calculation method suitable for the zinc oxide arrester according to any one of claims 1-5.

10. A lightning arrester fault identification method is characterized in that: determining whether each part is in failure by using the temperature distribution obtained by the temperature distribution calculation method for the zinc oxide arrester according to any one of claims 1 to 5.

Images