CN112182940B - High-voltage switch cabinet insulation partition plate arrangement optimization method considering microenvironment - Google Patents
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Abstract
The invention discloses a method for optimizing the arrangement of insulating partition plates of a high-voltage switch cabinet by considering a microenvironment, which comprises the following steps: firstly, establishing a three-dimensional finite element geometric model and an electric-thermal-current multi-field coupling physical model of the high-voltage switch cabinet, and carrying out simulation calculation on the internal thermal field humidity distribution of the high-voltage switch cabinet; then, based on the rule of influence of the simulation on the electric field in the high-voltage switch cabinet, adjusting the arrangement parameters of the insulating partition plates and analyzing the influence of the arrangement parameters on the electric field distribution; and meanwhile, the insulation clear distance of the high-voltage switch cabinet is calculated according to the electric field distribution of the high-voltage switch cabinet and the air stream discharge starting criterion, and the influence of the arrangement parameters of the insulation partition plates on the insulation clear distance is analyzed. By the method, the electric field distribution in the high-voltage switch cabinet can be as uniform as possible by reasonably arranging the insulating partition plates, so that the reliability and stability of equipment operation are improved.
Description
Technical Field
The invention relates to the technical safety field of structure optimization of a high-voltage switch cabinet of a power system, in particular to a method for optimizing the arrangement of insulating partition plates of the high-voltage switch cabinet by considering a microenvironment.
Background
The switch cabinet is used as a metal closed switch power device and is widely applied in China. The junction road is used for connecting a transmission network and a distribution network, and plays a vital role in improving the reliability of the distribution network. The frequent occurrence of faults of the high-voltage switch cabinet becomes a main obstacle for improving the reliability of a distribution network. Meanwhile, with the development and application of intellectualization and miniaturization of the switch cabinet taking air as a main insulating medium, the space size and the occupied area of the switch cabinet are greatly reduced, and meanwhile, the appearance of composite insulation and the improvement of the insulation requirement are realized.
In the actual operation process, the working environment of the high-voltage switch cabinet is severe, which relates to high temperature, high humidity, dirt and the like, and the insulation strength of the switch cabinet is reduced due to moisture absorption, dust attachment, condensation and the like when the insulation partition plate runs in the environment for a long time. Under harsh operating conditions, unreasonable structural design and insulation partition arrangement, the high-voltage switch cabinet easily causes insulation defects and even insulation faults, and the stable operation of a power system is seriously influenced. Therefore, it is necessary to optimize the arrangement parameters (size, number and installation position) of the insulating plates of the high-voltage switch cabinet under the premise of considering the microenvironment, so as to provide effective guidance for the insulation design transformation.
At present, for the optimization problem of high-voltage switch cabinet equipment elements, domestic and foreign researches mainly focus on structural optimization, such as the improvement of creepage distance, the addition of a shielding ring, the improvement of electrode shape and the like, and although a certain effect is obtained, the miniaturization and the compaction development of equipment are not facilitated. In addition, the discharge defects of the insulating partition plates of the switch cabinet occur frequently, and insulation optimization research aiming at the partition plates is relatively less. Therefore, under the condition of comprehensively considering the microenvironment of the switch cabinet, the insulation optimization design needs to be carried out on the electric field distribution of the insulation partition plate, and the reliability and the stability of the operation of the equipment are improved.
Disclosure of Invention
The invention aims to make up the defects of the prior art and provides the method for optimizing the arrangement of the insulating partition plates of the high-voltage switch cabinet in consideration of the microenvironment.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for optimizing the arrangement of insulating partition plates of a high-voltage switch cabinet in consideration of a microenvironment comprises the following steps:
s1, establishing a three-dimensional finite element geometric model according to a bus chamber structure of the high-voltage switch cabinet by adopting finite element simulation software COMSOL Multiphysics, and setting the length, width and height of the insulating partition plates as a, b and c and the central position coordinates thereof as (x, y and z);
s2, setting material parameters according to physical properties of each structural material of the bus chamber;
s3, adding current physical field constraint conditions to the three-dimensional finite element geometric model of the bus chamberVoltage excitation U is arranged in sequence for A, B, C three-phase bus bars in fieldA＝U0·sin(100·pi·t)、UB＝U0·sin(100·pi·t+120)、UC＝U0Sin (100. pi. t +240) with a metal casing grounded, where U040.5 kV;
s4, adding solid and fluid heat transfer physical fields to the three-dimensional finite element geometric model of the bus chamber, setting the bus as a heat source, and setting the thermal power of the ABC three-phase busbar as P according to the actual measurement resultA、PB、PCThe outer wall of the bus bar chamber is provided with a heat flux of 5W/m2Boundary conditions, the interior air setting humid air boundary conditions;
s5, mesh subdivision is carried out on the bus room according to the bus room structure and the physical field characteristics;
s6, establishing an electric-thermal-current multi-field coupling physical model, and carrying out simulation calculation on the electric-thermal-current multi-field coupling physical model to obtain the electric, thermal, current and humidity distribution of the electric-thermal-current multi-field coupling physical model;
s7, calculating the electric field distribution E (z) of the high-voltage switch cabinet based on the influence of the microenvironment to obtain the non-uniform coefficient of the electric field
S8, calculating the distribution of the impact ionization coefficient alpha and the electron adhesion coefficient eta of the air according to the electric field distribution, and substituting the obtained distribution of alpha and eta into the initial criterion (1) of the stream flow to judge the initial of the stream flow;
wherein z iscThe critical electron avalanche length is determined by alpha-eta;
s9, changing the insulation distance L to ensure that the insulation distance L just does not meet the criterion of stream starting, thereby determining the minimum insulation clear distance L of the high-voltage switch cabinetmin；
S10, changing the arrangement parameters of the insulating partition plates, wherein the arrangement parameters of the insulating partition plates are a, b and c, and the coordinates (x, y and z) of the center position, repeating the steps S1-S9 to calculate the electric fieldDistribution, electric field inhomogeneity factor f, and minimum insulation clear distance LminAnd judging the influence of the arrangement parameters of the insulating partition plates on the uniformity of the electric field and the minimum insulating clear distance, and finally obtaining the optimal arrangement parameters of the insulating partition plates.
Compared with the prior art, the invention has the beneficial effects that: the invention can realize the analysis of the influence of the arrangement of the insulation partition plates of the switch cabinet on the distribution of the electric field, thereby providing a basis for the calculation of the insulation net distance in the high-voltage switch cabinet under the composite insulation. Based on the basis of finite element simulation of multiple physical fields, the electric field distribution is homogenized by changing the size and the installation position of the insulating partition plate, and the influence on the insulating clear distance is analyzed.
Drawings
In order that the advantages of the invention will be readily understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings. Understanding that these drawings depict only typical embodiments of the invention and are not therefore to be considered to be limiting of its scope, the invention will be described and explained with additional specificity and detail through the use of the accompanying drawings.
FIG. 1 is a simulation-calculated model diagram of a bus bar room of a high-voltage switchgear;
FIG. 2 is a mesh generation result diagram for a bus bar room of the high voltage switchgear;
FIG. 3 is a graph of a simulation result of a temperature field for a bus bar compartment of a high voltage switchgear;
FIG. 4 is a flow field simulation result diagram for a bus bar chamber of a high voltage switch cabinet;
FIG. 5 is a graph of humidity simulation results for a bus bar compartment of a high voltage switchgear;
fig. 6 is a diagram of the electric field simulation result for the bus bar chamber of the high-voltage switch cabinet.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that embodiments of the invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in detail so as not to obscure the embodiments of the invention.
In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the invention. It is apparent that the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The following detailed description of preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.
In the description of the present invention, the terms "inside", "outside", "longitudinal", "transverse", "upper", "lower", "top", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are for convenience only to describe the present invention without requiring the present invention to be necessarily constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Embodiments of the invention are described in further detail below with reference to the accompanying drawings:
referring to fig. 1 to 6, the method for optimizing the arrangement of the insulating partition plate of the high-voltage switch cabinet considering the microenvironment comprises the steps of firstly, establishing a three-dimensional finite element geometric model and an electric-thermal-current multi-field coupling physical model of the high-voltage switch cabinet, and performing simulation calculation on the internal thermal field humidity distribution of the high-voltage switch cabinet; then, based on the rule of influence of the simulation on the electric field in the high-voltage switch cabinet, adjusting the arrangement parameters of the insulating partition plates and analyzing the influence of the arrangement parameters on the electric field distribution; and meanwhile, the insulation clear distance of the high-voltage switch cabinet is calculated according to the electric field distribution of the high-voltage switch cabinet and the air stream discharge starting criterion, and the influence of the arrangement parameters of the insulation partition plates on the insulation clear distance is analyzed. The method comprises the following specific steps:
s1, establishing a three-dimensional finite element geometric model according to the bus chamber structure of the high-voltage switch cabinet by adopting finite element simulation software COMSOL Multiphysics, and setting the length, the width and the height of the insulating partition plates as a, b and c and the central position coordinates as (x, y and z).
And S2, setting material parameters according to the physical properties of the structural materials of the bus chamber.
S3, adding current physical field constraint conditions to the three-dimensional finite element geometric model of the bus chamber,voltage excitation U is sequentially arranged on A, B, C three-phase bus bars in a physical fieldA＝U0·sin(100·pi·t)、UB＝U0·sin(100·pi·t+120)、UC＝U0Sin (100. pi. t +240) with a metal casing grounded, where U0Is 40.5 kV.
S4, adding solid and fluid heat transfer physical fields to the three-dimensional finite element geometric model of the bus chamber, setting the bus as a heat source, and setting the thermal power of the ABC three-phase busbar as P according to the actual measurement resultA、PB、PCIn which P isACan be set to 25.3W, PBCan be set to 19.7W, PCCan be set to 16.2W, and the heat flux of the outer wall of the bus bar chamber is 5W/m2Boundary conditions, the interior air sets the humid air boundary conditions.
And S5, mesh generation is carried out on the bus room according to the bus room structure and the physical field characteristics.
S6, establishing an electric-thermal-flow multi-field coupling physical model, and carrying out simulation calculation on the electric-thermal-flow multi-field coupling physical model to obtain the electric, thermal, flow and humidity distributions of the electric-thermal-flow multi-field coupling physical model.
S7, calculating the electric field distribution E (z) of the high-voltage switch cabinet based on the influence of the microenvironment to obtain the non-uniform coefficient of the electric field
S8, calculating the distribution of the impact ionization coefficient alpha and the electron adhesion coefficient eta of the air according to the electric field distribution, and substituting the obtained distribution of alpha and eta into the initial criterion (1) of the stream flow to judge the initial of the stream flow;
wherein z iscThe critical electron avalanche length is determined by α ═ η.
S9, changing the insulation distance L to ensure that the insulation distance L just does not meet the criterion of stream starting, thereby determining the minimum insulation clear distance L of the high-voltage switch cabinetmin。
S10, changing the arrangement parameters of the insulating partition boardsThe arrangement parameters of the middle insulating partition boards are a, b and c and the coordinates (x, y and z) of the central position, and the steps S1-S9 are repeated to calculate the electric field distribution, the electric field nonuniformity factor f and the minimum insulating clear distance LminAnd judging the influence of the arrangement parameters of the insulating partition plates on the uniformity of the electric field and the minimum insulating clear distance, and finally obtaining the optimal arrangement parameters of the insulating partition plates.
In summary, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can propose other embodiments within the technical teaching of the present invention, but these embodiments are included in the scope of the present invention.
Claims (1)
1. A method for optimizing the arrangement of insulating partition plates of a high-voltage switch cabinet in consideration of a microenvironment is characterized by comprising the following steps:
s1, establishing a three-dimensional finite element geometric model according to a bus chamber structure of the high-voltage switch cabinet by adopting finite element simulation software COMSOL Multiphysics, and setting the length, width and height of the insulating partition plates as a, b and c and the central position coordinates thereof as (x, y and z);
s2, setting material parameters according to physical properties of each structural material of the bus chamber;
s3, adding current physical field constraint conditions to the bus chamber three-dimensional finite element geometric model, and sequentially setting voltage excitation U for A, B, C three-phase bus bars in a physical fieldA＝U0·sin(100·pi·t)、UB＝U0·sin(100·pi·t+120)、UC＝U0Sin (100. pi. t +240) with a metal casing grounded, where U040.5 kV;
s4, adding solid and fluid heat transfer physical fields to the three-dimensional finite element geometric model of the bus chamber, setting the bus as a heat source, and setting the thermal power of the ABC three-phase busbar as P according to the actual measurement resultA、PB、PCThe outer wall of the bus bar chamber is provided with a heat flux of 5W/m2Boundary conditions, the interior air setting humid air boundary conditions;
s5, mesh subdivision is carried out on the bus room according to the bus room structure and the physical field characteristics;
s6, establishing an electric-thermal-current multi-field coupling physical model, and carrying out simulation calculation on the electric-thermal-current multi-field coupling physical model to obtain the electric, thermal, current and humidity distribution of the electric-thermal-current multi-field coupling physical model;
s7, calculating the electric field distribution E (z) of the high-voltage switch cabinet based on the influence of the microenvironment to obtain the non-uniform coefficient of the electric field
S8, calculating the distribution of the impact ionization coefficient alpha and the electron adhesion coefficient eta of the air according to the electric field distribution, and substituting the obtained distribution of alpha and eta into the initial criterion (1) of the stream flow to judge the initial of the stream flow;
wherein z iscThe critical electron avalanche length is determined by alpha-eta;
s9, changing the insulation distance L to ensure that the insulation distance L just does not meet the criterion of stream starting, thereby determining the minimum insulation clear distance L of the high-voltage switch cabinetmin；
S10, changing the arrangement parameters of the insulating partition boards, wherein the arrangement parameters of the insulating partition boards are a, b and c and the coordinates (x, y and z) of the center position, repeating the steps S1-S9 to calculate the electric field distribution, the electric field nonuniformity coefficient f and the minimum insulation clear distance LminAnd judging the influence of the arrangement parameters of the insulating partition plates on the uniformity of the electric field and the minimum insulating clear distance, and finally obtaining the optimal arrangement parameters of the insulating partition plates.
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