CN112597626A - Simulation calculation method of contact resistance at grounding conductor connection part based on COMSOL - Google Patents
Simulation calculation method of contact resistance at grounding conductor connection part based on COMSOL Download PDFInfo
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- 238000004364 calculation method Methods 0.000 title claims abstract description 23
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- 230000003746 surface roughness Effects 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 13
- 230000008602 contraction Effects 0.000 claims description 3
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- 238000010586 diagram Methods 0.000 description 2
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Abstract
本发明提出一种基于COMSOL的接地导体连接处接触电阻仿真计算方法，通过搭建COMSOL仿真模型，根据所获取的接地导体规格、接地导体电阻率、接地导体表面粗糙度、螺栓型号，设置COMSOL软件中的接地导体相关参数，建立接地导体模型；根据获取的接地导体相关参数，在接地导体一端建立电流源，一端设置接地，通过计算两端电势差来间接计算接地导体的接触电阻。该方法能够准确评估接地导体连接处上的接触电阻大小，及时做好安全措施，提高接地导体的在电力系统发生短路时的通流能力。
The invention proposes a COMSOL-based simulation calculation method for the contact resistance of the grounding conductor connection. By building a COMSOL simulation model, according to the acquired grounding conductor specifications, grounding conductor resistivity, grounding conductor surface roughness, and bolt type, the COMSOL software is set. According to the relevant parameters of the grounding conductor obtained, the grounding conductor model is established; according to the obtained relevant parameters of the grounding conductor, a current source is established at one end of the grounding conductor, and one end is grounded, and the contact resistance of the grounding conductor is indirectly calculated by calculating the potential difference between the two ends. The method can accurately evaluate the contact resistance at the connection of the grounding conductor, take safety measures in time, and improve the current-carrying capacity of the grounding conductor when a short circuit occurs in the power system.
Description
Technical Field
The invention belongs to the field of power system grounding simulation calculation, and particularly relates to a COMSOL-based grounding conductor connection contact resistance simulation calculation method.
Background
With the continuous improvement of the voltage level of the power grid, the highest voltage level reaches 1000kV, the grounding short-circuit current of the system is increased, and the voltage of the grounding grid is increased. In large earth current systems, the short circuit current flowing into the earth grid is typically in the range of a few thousand amperes to a few tens of kiloamperes. Such a strong short-circuit current flows through the earth screen conductor and dissipates into the ground, which generates a high amount of heat in the conductor.
When the temperature of the conductors exceeds a certain value and the conductors are naturally cooled in the soil, the mechanical properties of the conductors are obviously reduced, particularly at the connecting part between the conductors, because the contact resistance is large, when short-circuit current passes through the connecting part, the temperature is far higher than other positions, and the conductors reach the melting point of the metal material, so that the conductors are melted. This can promote the ground net conductor fracture, and the ground net disintegrates to greatly reduce the reliability of ground net, cause the potential safety hazard. Therefore, how to evaluate the magnitude of the contact resistance at the ground conductor connection is a problem that needs to be solved urgently at present.
The invention aims to overcome the defects of the prior art, provides a COMSOL-based grounding conductor connection contact resistance simulation calculation method, evaluates the size of the grounding conductor connection contact resistance, makes a measure for reducing the contact resistance in time and improves the current capacity of the grounding conductor.
Disclosure of Invention
The invention provides a COMSOL-based method for simulating and calculating contact resistance at a connection part of a grounding conductor, which comprises the following steps:
step 1: obtaining basic parameters of grounding conductor
The grounding conductor comprises a grounding conductor specification, a grounding conductor material performance parameter, grounding conductor contact surface properties, a bolt model and a nut model;
step 2: building COMSOL simulation model
Setting relevant parameters of the grounding conductor in COMSOL software according to the obtained specification of the grounding conductor, the performance parameters of the grounding conductor material, the properties of the grounding conductor contact surface, the type of the bolt and the type of the nut, and establishing a grounding conductor model;
and step 3: ground conductor bulk resistance R1Is calculated by
Setting the grounding conductor as a united body, wherein the contact surfaces are completely bonded without contact resistance, establishing a current source at one end, introducing 1A current, setting the grounding at the other end, and indirectly calculating the body resistance R of the grounding conductor by calculating the potential difference between the two ends1；
And 4, step 4: ground conductor overall resistance R2Is calculated by
The grounding conductor is arranged into an assembly body, contact resistance exists between contact surfaces at the moment, a current source is established at one end, 1A current is introduced, grounding is arranged at the other end, and the potential difference between the two ends is calculated to indirectly connectCalculating the overall resistance R of the ground conductor2；
And 5: calculation of the contact resistance R of the grounding conductor
From the calculated bulk resistance R of the ground conductor1And the overall resistance R of the grounding conductor2Integral resistance R of grounding conductor2Minus the bulk resistance R of the ground conductor1The evaluated value is the ground conductor contact resistance R.
Further, the specifications of the grounding conductor comprise the length of the grounding conductor, the lap joint length of the connecting part of the grounding conductor and the thickness of the grounding conductor.
Further, the performance parameters of the grounding conductor material comprise density, resistivity, Young modulus, Poisson's ratio, relative permeability, thermal expansion coefficient, resistivity, temperature coefficient and thermal conductivity coefficient.
Further, the ground conductor contact surface properties include contact surface roughness average height, contact surface roughness average slope, contact pressure, micro-hardness, shrink conductance.
Further, the bolt model includes bolt head fastener radius, bolt head thickness, nominal diameter, bolt length.
Further, the nut model includes the nominal aperture of the nut, the thickness of the nut, and the radius of the bolt head fastener.
Further, the ground conductors are arranged as a united body, and the body resistance R of the ground conductors is calculated1(ii) a Calculating the overall resistance R of the grounding conductor2When the grounding conductor is arranged as an assembly body, the value of the pretightening force of the bolt is set (the pretightening force F and the fastening moment M meet the condition that M is 0.2F D, and D is the nominal diameter of the bolt); ground conductor overall resistance R2Minus the bulk resistance R of the ground conductor1The evaluated value is the ground conductor contact resistance R.
Drawings
Fig. 1 is a flow chart of a simulation calculation model for establishing contact resistance at a ground conductor connection.
FIG. 2 is a simulation model diagram of a grounding conductor established based on COMSOL in the method of the present invention.
FIG. 3 is a schematic diagram of the locations of the applied current and the measured voltage in the method of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples.
The invention combines COMSOL software to carry out simulation calculation on the contact resistance at the connection position of the grounding conductor.
The COMSOL software is a large-scale high-grade numerical simulation software developed by the COMSOL company in Sweden and widely applied to scientific research and engineering calculation in various fields, and realizes high-precision numerical simulation of any multi-physical field by high-efficiency calculation performance and outstanding multi-physical field coupling analysis capability. The invention combines the condition of the lap joint of the grounding conductor with COMSOL software, comprehensively considers the factors of the specification of the grounding conductor, the material performance of the grounding conductor, the contact surface attribute of the grounding conductor and the like, establishes a simulation model of the lap joint of the grounding conductor and can more accurately calculate the contact resistance of the lap joint of the grounding conductor.
Specifically, the COMSOL-based method for simulating and calculating the contact resistance at the connection position of the ground conductor comprises the following steps:
step 1, obtaining electrical basic parameters, wherein the parameters comprise:
1) the related specifications of the grounding conductor comprise the length of the grounding conductor, the lap joint length of the connecting part of the grounding conductor and the thickness of the grounding conductor;
2) the related performance parameters of the grounding conductor material comprise density, resistivity, Young modulus, Poisson ratio, relative permeability, thermal expansion coefficient, resistivity, temperature coefficient and thermal conductivity coefficient;
3) the properties of the contact surface of the grounding conductor comprise the average height of the roughness of the contact surface, the average slope of the roughness of the contact surface, contact pressure, microhardness and contraction conductance;
4) the related bolt model comprises the radius of a bolt head fastener, the thickness of a bolt head, a nominal diameter and the length of a bolt;
5) the related nut model comprises a nominal aperture of the nut, the thickness of the nut and the radius of a bolt head fastener.
And 2, building a COMSOL simulation model.
A flow chart of a simulation calculation model of the contact resistance at the ground conductor connection is set up, as shown in fig. 1.
In the COMSOL, a 'geometric' module under a component is used, model coordinates are firstly calculated, then a three-dimensional model of the grounding conductor is drawn according to the coordinates, a conductor material which the grounding conductor wants to define is selected from a material library, the selected material is compared with performance parameters acquired by the grounding conductor, and if the selected material is different from the performance parameters acquired by the grounding conductor, the selected material is modified according to the performance parameters acquired by the grounding conductor. And simultaneously defining the properties of the electric contact pairs in the current module, including the average height of the contact surface roughness, the average slope of the contact surface roughness, the contact pressure, the micro-hardness and the contraction conductance. In the solid mechanical module, the contact pressure method of the contact pair is selected as "penalty", while the frame of the ground conductor is set as "fixed constraint".
And (3) establishing a model of the connection part of the grounding conductor according to the step (2), and selecting corresponding fastening torque to complete the establishment of the model according to the actual grounding working condition, wherein the model is shown in figure 2.
And step 3: ground conductor bulk resistance R1Is calculated by
Setting the grounding conductor as a united body, wherein the contact surfaces are completely bonded without contact resistance, establishing a current source at one end, introducing 1A current, setting the grounding at the other end, and indirectly calculating the body resistance R of the grounding conductor by calculating the potential difference between the two ends1；
And 4, step 4: ground conductor overall resistance R2Is calculated by
Set up the ground conductor into the assembly body, there is contact resistance between the contact surface this moment, the current source is established to one end, lets in 1A electric current, and one end sets up ground connection, sets up the numerical value of bolt pretightning force simultaneously (satisfy between pretightning force F and the fastening moment M that M is 0.2F D, D is the nominal diameter of bolt), through calculating the whole resistance R of both ends potential difference indirect calculation ground conductor2；
And 5: calculation of the contact resistance R of the grounding conductor
From the calculated bulk resistance R of the ground conductor1And the overall resistance R of the grounding conductor2Integral resistance R of grounding conductor2Minus the bulk resistance R of the ground conductor1The evaluated value is groundingConductor contact resistance R.
The schematic of the locations where current is applied and voltage is measured in steps 3-5 is shown in FIG. 3.
Through the steps, the contact resistance of the grounding conductor at the connection part under different fastening moments can be accurately calculated.
It should be emphasized that the embodiments described herein are illustrative rather than restrictive, and thus the present invention is not limited to the embodiments described in the detailed description, but also includes other embodiments that can be derived from the technical solutions of the present invention by those skilled in the art.
Claims (7)
1. A method for simulating and calculating contact resistance at a connection part of a grounding conductor based on COMSOL comprises the following steps:
step 1: the basic parameters of the grounding conductor are obtained,
the grounding conductor comprises a grounding conductor specification, a grounding conductor material performance parameter, grounding conductor contact surface properties, a bolt model and a nut model;
step 2: a COMSOL simulation model is built up,
setting relevant parameters of the grounding conductor in COMSOL software according to the acquired specification of the grounding conductor, the material performance parameters of the grounding conductor, the contact surface attribute of the grounding conductor, the model parameters of the bolt and the model parameters of the nut, and establishing a grounding conductor model;
and step 3: ground conductor bulk resistance R1The calculation of (a) is performed,
setting the grounding conductor as a united body, wherein the contact surfaces are completely bonded without contact resistance, establishing a current source at one end, introducing 1A current, setting the grounding at the other end, and indirectly calculating the body resistance R of the grounding conductor by calculating the potential difference between the two ends1；
And 4, step 4: ground conductor overall resistance R2The calculation of (a) is performed,
the grounding conductor is arranged into an assembly body, contact resistance exists between contact surfaces at the moment, a current source is established at one end, 1A current is introduced, the grounding is arranged at one end, and meanwhile the numerical value of the bolt pretightening force is set, wherein the pretightening force F and the fastening torqueM is 0.2F D, D is the nominal diameter of the bolt, and the overall resistance R of the grounding conductor is indirectly calculated by calculating the potential difference between the two ends2；
And 5: the calculation of the contact resistance R of the ground conductor,
from the calculated bulk resistance R of the ground conductor1And the overall resistance R of the grounding conductor2Integral resistance R of grounding conductor2Minus the bulk resistance R of the ground conductor1The evaluated value is the ground conductor contact resistance R.
2. The COMSOL-based ground conductor connection contact resistance simulation calculation method of claim 1, wherein: the specifications of the grounding conductor comprise the length of the grounding conductor, the lap joint length of the connecting part of the grounding conductor and the thickness of the grounding conductor.
3. The COMSOL-based ground conductor connection contact resistance simulation calculation method of claim 1, wherein: the performance parameters of the grounding conductor material comprise density, resistivity, Young modulus, Poisson ratio, relative permeability, thermal expansion coefficient, resistivity, temperature coefficient and thermal conductivity coefficient.
4. The COMSOL-based ground conductor connection contact resistance simulation calculation method of claim 1, wherein: the ground conductor contact surface properties include contact surface roughness average height, contact surface roughness average slope, contact pressure, microhardness, and electrical conductance by contraction.
5. The COMSOL-based ground conductor connection contact resistance simulation calculation method of claim 1, wherein: the bolt model parameters comprise the radius of a bolt head fastener, the thickness of a bolt head, a nominal diameter and the length of a bolt.
6. The COMSOL-based ground conductor connection contact resistance simulation calculation method of claim 1, wherein: the nut model parameters comprise the nominal aperture of the nut, the thickness of the nut and the radius of a bolt head fastener.
7. The COMSOL-based ground conductor connection contact resistance simulation calculation method of claim 1, wherein: calculating the body resistance R of the grounding conductor1Providing a ground conductor as a united body; calculating the overall resistance R of the grounding conductor2When the grounding conductor is arranged as an assembly body, the numerical value of the pretightening force of the bolt is set; ground conductor overall resistance R2Minus the bulk resistance R of the ground conductor1The evaluated value is the ground conductor contact resistance R.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6208146B1 (en) * | 1999-02-08 | 2001-03-27 | General Motors Corporation | Method and apparatus for measuring contact resistance for spot welding simulations |
| CN105183988A (en) * | 2015-09-07 | 2015-12-23 | 电子科技大学 | Method of calculating and analyzing temperature and stress strain finite elements of earth stud after being powered on |
| CN109460616A (en) * | 2018-11-12 | 2019-03-12 | 广东电网有限责任公司 | Contact resistance calculation method and device |
| CN110068735A (en) * | 2019-01-24 | 2019-07-30 | 贵州电网有限责任公司 | A method of measurement and reckoning grounding body and soil contact resistance |
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2020
- 2020-11-19 CN CN202011302581.6A patent/CN112597626A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6208146B1 (en) * | 1999-02-08 | 2001-03-27 | General Motors Corporation | Method and apparatus for measuring contact resistance for spot welding simulations |
| CN105183988A (en) * | 2015-09-07 | 2015-12-23 | 电子科技大学 | Method of calculating and analyzing temperature and stress strain finite elements of earth stud after being powered on |
| CN109460616A (en) * | 2018-11-12 | 2019-03-12 | 广东电网有限责任公司 | Contact resistance calculation method and device |
| CN110068735A (en) * | 2019-01-24 | 2019-07-30 | 贵州电网有限责任公司 | A method of measurement and reckoning grounding body and soil contact resistance |
Non-Patent Citations (3)
| Title |
|---|
| SUN XIANGDONG等: "Research on Performance of Grounding Conductor Based on Multi-Physics", 《JOURNAL OF PHYSICS: CONFERENCE SERIES》 * |
| 刘刚等: "基于轴向热路模型的架空地线与预绞丝接触端面接触电阻的计算", 《华南理工大学学报(自然科学版)》 * |
| 辛鹏等: "螺栓连接的有限元建模及仿真分析", 《车辆与动力技术》 * |
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Application publication date: 20210402 |