CN-121980771-A - Multi-physical-field pre-judging method for separator temperature rise

CN121980771ACN 121980771 ACN121980771 ACN 121980771ACN-121980771-A

Abstract

The invention provides a multi-physical-field prediction method for the temperature rise of a separator, which comprises the steps of carrying out geometric modeling and material modeling on a defined physical structure of the separator by utilizing multi-physical-field simulation software, carrying out grid distribution to obtain a multi-physical-field geometric model and a material physical model, carrying out electric field, temperature field simulation and simulation probe setting under various current working conditions based on the multi-physical-field geometric model and the material physical model to obtain a multi-physical-field simulation temperature rise result, carrying out parameterization scanning on the structure dimensions of each part of the separator based on the defined physical structure of the separator to obtain various scheme results, selecting an optimal design scheme from the scheme results, carrying out comparison of simulation temperature rise and expected temperature rise based on the multi-physical-field simulation temperature rise result of the optimal scheme, carrying out prediction of the separator according to the comparison result, and obtaining a simulation reliability evaluation result. The invention can reduce the number of the test samples, shorten the test period and avoid blind field tests, thereby realizing the technical effects of energy conservation and cost reduction.

Inventors

CAO WEN
YANG HAO
ZENG XINRONG
YANG TE
WANG HAO
HE ZEGONG
WU JIANG
DU YAN
ZHAO LONG
ZHANG YONGYI

Assignees

西安工程大学

Dates

Publication Date: 20260505
Application Date: 20251231

Claims (7)

1. The multi-physical-field pre-judging method for the temperature rise of the separator is characterized by comprising the following steps of: defining a physical structure of a separator, carrying out geometric modeling and material modeling on the physical structure of the separator by utilizing multi-physical-field simulation software, and carrying out grid distribution to obtain a multi-physical-field geometric and material physical model; Based on the multi-physical field geometry and the material physical model, performing electric field simulation, temperature field simulation and simulation probe setting under various current working conditions to obtain a multi-physical field simulation temperature rise result; Based on the physical structure of the separator, carrying out parameterized scanning on the structure size of each part of the separator to obtain a plurality of scheme results, and selecting an optimal scheme from the plurality of scheme results; based on the multi-physical-field simulation temperature rise result of the optimal scheme, comparing the simulation temperature rise with the expected temperature rise, and performing prejudgment of the separator according to the comparison result to obtain a simulation credibility evaluation result.
2. The method for predicting the temperature rise of a separator in multiple physical fields according to claim 1, wherein defining the separator physical structure, performing geometric modeling and material modeling on the separator physical structure by using multiple physical fields simulation software, and performing grid distribution to obtain a multiple physical fields geometric and material physical model, comprises: Selecting the structural form, the material form and the geometric parameters of the developed detacher to obtain a detacher physical structure, wherein the detacher physical structure comprises a heating resistor, a thermal explosion device or a hot melting part, a current lead, a copper sheet, a spring, an inductor, a shell, an insulating layer, a filling layer and sealant; And selecting multiple physical field simulation software, performing geometric modeling on a heating resistor, a thermal explosion device or a hot melting part, a copper sheet, a spring, an inductor, a conductor, a shell, a heat preservation layer, a filling layer and sealant of the physical structure of the separator, selecting materials of the physical structure, defining constant-pressure heat capacity, relative dielectric constant, density, heat conductivity coefficient and conductivity parameters, and obtaining a multiple physical field geometric and material physical model.
3. The method for predicting the temperature rise of the separator by using the multiple physical fields according to claim 2, wherein the method for predicting the temperature rise of the separator by using the multiple physical fields is characterized by performing electric field simulation, temperature field simulation and simulation probe setting under multiple current working conditions based on the multiple physical field geometry and material physical model to obtain a multiple physical field simulation temperature rise result, and comprises the following steps: applying power frequency leakage current or impact current, heidler thunder current or square wave current to the conductive part in the multi-physical field geometric and material physical model to obtain electric field distribution; defining the environment temperature, setting Joule heat as a heat source item of a temperature field, conducting heat transfer through heat conduction and heat convection, and then calculating an energy conservation equation, a mass conservation equation and a momentum conservation equation to obtain steady-state temperature field distribution; Setting the Joule heat as a heat source boundary condition in steady-state temperature field distribution, setting fluid free in and out in a flow field as a flow field boundary condition, and setting a probe with the type of maximum value at a thermal explosion device or a thermal melting part; recording the highest temperature of the heating resistor along with time by using the probe, and outputting a temperature rise and time curve and a steady-state highest temperature value; And integrating the electric field distribution, the steady-state temperature field distribution, the temperature rise and time curve and the steady-state highest temperature value into a multi-physical field simulation temperature rise result.
4. A method for predicting multiple physical fields of temperature rise of a separator according to claim 3, wherein applying a power frequency leakage current or impact current, heidler rad current or square wave current to a conductive part in the multiple physical field geometry and material physical model to obtain electric field distribution comprises: And applying power frequency leakage current or impact current, heidler lightning current or square wave current to the conductive part in the multi-physical field geometric and material physical model as simulation current. Based on the simulation current, electric field intensity and current density are calculated, a current field equation is calculated according to the electric field intensity and the current density, joule heat is calculated according to the current field equation, and then the change relation of conductivity along with temperature is calculated according to the Joule heat, so that electric field distribution is obtained.
5. The method for predicting multiple physical fields for temperature rise of a detacher according to claim 4, wherein the parameterized scanning is performed on the structural dimensions of each part of the detacher based on the physical structure of the detacher to obtain multiple scheme results, and an optimal scheme is selected from the multiple scheme results, comprising: based on the physical structure of the separator, parameterizing and scanning the key structure size of the separator, acquiring temperature rise distribution under different size schemes through multi-physical field simulation, iteratively optimizing the structure parameters with the minimum temperature rise as a target, and determining the optimal structure size; Performing multi-physical field simulation comparison on the heat-insulating layer material, quantifying the influence of the thermal resistance, the thermal conductivity coefficient and the heat capacity characteristic of different materials on the temperature rise of the separator, and selecting the optimal heat-insulating layer material which is most matched with the heat characteristic of the separator; And combining the optimal structure size and the optimal heat insulation layer material to construct an optimal scheme of the heat-structure coupling of the separator.
6. The multi-physical-field pre-judging method for the temperature rise of the separator according to claim 5, wherein the comparison of the simulated temperature rise and the expected temperature rise is performed based on the multi-physical-field simulated temperature rise result of the optimal scheme, and the pre-judging of the separator is performed according to the comparison result to obtain a simulated credibility evaluation result, and the method comprises the following steps: Based on the multi-physical-field simulation temperature rise result, comparing the simulation temperature rises under the action of various simulation currents with the expected temperature rises, and judging that the detacher cannot reach the action temperature under the actual power frequency leakage current and impact when the highest temperature rise value is less than 95% of the expected temperature rise; And when the separator is judged to be unable to reach the action temperature, continuing to improve the structural scheme of the separator, and when the separator is judged to be able to reach the action temperature, developing an entity test to obtain experimental comparison data, and performing simulated cross verification according to the experimental comparison data to obtain a simulation credibility assessment result.
7. The method of claim 6, wherein the physical test comprises environmental configuration, object configuration and temperature measurement.

Description

Multi-physical-field pre-judging method for separator temperature rise Technical Field The invention relates to the technical field of performance detection of a separator, in particular to a multi-physical-field pre-judging method for temperature rise of the separator. Background Currently, an adaptive type disconnector is commonly assembled on a running metal oxide arrester, so that the arrester can be reliably disconnected from a system when the arrester fails, and the fault expansion is prevented. When the conventional thermal explosion type detacher is used for performing impact tests such as power frequency leakage current, 2ms square wave, 4/10 mu s large current and the like, the temperature rise margin of the conventional thermal explosion type detacher can not be quantified before the test by taking the action or not as a qualified criterion, so that 1) the test result is only in a binary conclusion (action/non-action) that quantitative margin information of the action critical point is not obtained, and the critical margin can not be predicted in advance by fully evaluating the false action risk and the refusal action risk. 2) The pre-test quantified temperature rise margin is not possible-the temperature rise of a design cannot be quantitatively predicted (Margin of temperature rise) before the test, but the problem is passively found in the test. 3) The repeated test is repeated for a plurality of times, the cost is high, a large number of samples are needed for grasping whether the design is reliable, the repeated test is performed under various working conditions, the equipment occupation time is long, and the manpower and material resources are high. 4) The simulation method is free from system or excessive in simplification, only heat conduction is considered in the traditional simulation, heat convection/heat radiation is not considered, a certain model is possibly simply adopted for lightning current waveforms, deviation from measured data is large, temperature rise prediction accuracy is insufficient, and the method is difficult to be used as a design waste judgment basis. Disclosure of Invention In order to overcome the defects of the prior art, the invention aims to provide the multi-physical-field prejudging method for the temperature rise of the separator, which can reduce the number of samples, shorten the test period and avoid blind field tests, thereby realizing the technical effects of energy conservation and cost reduction. In order to achieve the purpose, the invention provides a multi-physical-field prejudging method for the temperature rise of a separator, which comprises the following steps: defining a physical structure of a separator, carrying out geometric modeling and material modeling on the physical structure of the separator by utilizing multi-physical-field simulation software, and carrying out grid distribution to obtain a multi-physical-field geometric and material physical model; Based on the multi-physical field geometry and the material physical model, performing electric field simulation, temperature field simulation and simulation probe setting under various current working conditions to obtain a multi-physical field simulation temperature rise result; Based on the physical structure of the separator, carrying out parameterized scanning on the structure size of each part of the separator to obtain a plurality of scheme results, and selecting an optimal scheme from the plurality of scheme results; based on the multi-physical-field simulation temperature rise result of the optimal scheme, comparing the simulation temperature rise with the expected temperature rise, and performing prejudgment of the separator according to the comparison result to obtain a simulation credibility evaluation result. Optionally, defining a physical structure of the detacher, performing geometric modeling and material modeling on the physical structure of the detacher by using multi-physical-field simulation software, and performing grid distribution to obtain a multi-physical-field geometric and material physical model, including: Selecting the structural form, the material form and the geometric parameters of the developed detacher to obtain a detacher physical structure, wherein the detacher physical structure comprises a heating resistor, a thermal explosion device or a hot melting part, a current lead, a copper sheet, a spring, an inductor, a shell, an insulating layer, a filling layer and sealant; And selecting multiple physical field simulation software, performing geometric modeling on a heating resistor, a thermal explosion device or a hot melting part, a copper sheet, a spring, an inductor, a conductor, a shell, a heat preservation layer, a filling layer and sealant of the physical structure of the separator, selecting materials of the physical structure, defining constant-pressure heat capacity, relative dielectric constant, density, heat conductivity coefficient and conduc