A simulation method of GIS high-voltage conductor connecting mechanism

Abstract

The application discloses a simulation method of a GIS high-voltage conductor connecting mechanism. The method comprises the following steps: calculating a load matrix of a structure model of a GIS high-voltage conductor connecting mechanism based on electromagnetic principles according to the structure model and an electromagnetic excitation source of the GIS high-voltage conductor connecting mechanism; constructing a simulation model of the GIS high-voltage conductor connecting mechanism "electromagnetic excitation source-vibration displacement" based on an elastic dynamics equation according to the load matrix; and simulating the structure model of the GIS high-voltage conductor connecting mechanism according to the simulation model to determine electromagnetic parameter distribution characteristics and vibration parameter distribution characteristics. The technical scheme provided in the embodiment of the application realizes the pre-judgment of possible fault hidden dangers of each structure unit of the GIS high-voltage conductor connecting mechanism, and provides a technical guide for defect detection technology optimization and abnormal vibration phenomenon analysis.

Description

Technical Field

[0001] This invention relates to the field of power distribution network technology, and in particular to a simulation method for a GIS high-voltage conductor connection mechanism. Background Technology

[0002] Insulation and mechanical defects formed during the manufacturing, installation, and operation of gas-insulated switchgear (GIS) are the main causes of its failures. Studies on typical GIS failure cases show that discharge and mechanical failures account for 52.0% and 18.8% respectively, with nearly one-third of discharge failures directly related to mechanical defects. Therefore, investigating the dynamic response characteristics of mechanical vibration defects in the high-voltage conductor connection mechanism of GIS is crucial for optimizing defect detection technology and analyzing abnormal vibration phenomena.

[0003] Currently, research on the vibration behavior mechanism of power equipment focuses on coil-type equipment, pantograph-catenary contact, and circuit breaker operating mechanisms, which exhibit obvious vibration anomalies. However, research on the nonlinear characteristics of mechanical vibration defects in GIS high-voltage conductor connection mechanisms has not been reported, and there is a lack of technical guidance in optimizing defect detection technology and analyzing abnormal vibration phenomena. Summary of the Invention

[0004] This invention provides a simulation method for GIS high-voltage conductor connection mechanisms to address the lack of technical guidance in the optimization of defect detection technology and the analysis of abnormal vibration phenomena in existing technologies.

[0005] According to one aspect of the present invention, a simulation method for a GIS high-voltage conductor connection mechanism is provided, characterized in that it includes:

[0006] Based on the structural model of the high-voltage conductor connection mechanism of the gas-insulated switchgear (GIS) and the electromagnetic excitation source, the load matrix of the structural model is calculated according to electromagnetic principles.

[0007] Based on the load matrix and the elastic dynamics equation, a simulation model of "electromagnetic excitation source-vibration displacement" for the GIS high-voltage conductor connection mechanism is constructed.

[0008] The structural model of the GIS high-voltage conductor connection mechanism is simulated based on the simulation model to determine the electromagnetic parameter distribution characteristics and vibration parameter distribution characteristics.

[0009] Optionally, the GIS high-voltage conductor connection mechanism includes multiple structural units, which are connected to each other; the calculation of the load matrix of the structural model based on the pre-constructed structural model of the gas-insulated switchgear (GIS) high-voltage conductor connection mechanism and the electromagnetic excitation source, based on electromagnetic principles, includes:

[0010] The external Schlorentz stress matrix of each structural unit node is determined based on the in-volume current density, electric displacement, electric field strength, magnetic induction intensity, in-unit volume, gradient operator, and Maxwell stress tensor of each structural unit node under the electromagnetic excitation source.

[0011] The load matrix of the structural model is determined by summing the externally applied Lorentz stress matrices of all the structural unit nodes.

[0012] Optionally, when the GIS high-voltage conductor connection mechanism is made of a linear elastic material, the step of constructing a simulation model of the GIS high-voltage conductor connection mechanism based on the load matrix and the elastic dynamics equation includes:

[0013] Based on the preset material parameters and deformation compatibility relationship, calculate Lamé's first constant, Lamé's second constant, and Green's strain matrix;

[0014] Based on the Lamé first constant, the Lamé second constant, and the Green strain matrix, the Caucthy stress matrix is ​​calculated according to the constitutive relation of elasticity.

[0015] Based on the Caucthy stress matrix and the load matrix, and using the elastic dynamics equations, the vibration displacement of the structural model in the mechanical field is calculated.

[0016] Optionally, after determining the external Schrödinger stress matrix of the structural unit node based on the intravolume current density, electric displacement, electric field strength, magnetic induction intensity, intra-unit volume, gradient operator, and Maxwell stress tensor of each structural unit node, the method further includes:

[0017] The external Schrörentz stress matrix of the structural unit node is iterated according to the first preset iteration condition;

[0018] Determine whether the iteration of the external Schrödinger stress matrix has ended. If not, return to the step of determining the external Schrödinger stress matrix of the structural unit node based on the volume current density, electric displacement, electric field strength, magnetic induction intensity, volume within the unit, gradient operator, and Maxwell stress tensor of each structural unit node.

[0019] After calculating the vibration displacement of the structural model in the mechanical field based on the Caucthy stress matrix and the load matrix and the elastic dynamics equations, the method further includes:

[0020] The vibration displacement of the structural model in the mechanical field is iterated according to the second preset iteration condition;

[0021] Determine whether the vibration displacement iteration has ended. If not, return to the step of calculating the Lamé first constant, Lamé second constant, and Green strain matrix based on the deformation compatibility relationship according to the preset material parameters.

[0022] Optionally, after simulating the structural model of the GIS high-voltage conductor connection mechanism based on the "electromagnetic-mechanical" coupled vibration simulation model to determine the electromagnetic parameter distribution characteristics and vibration parameter distribution characteristics, the method further includes:

[0023] Based on the electromagnetic parameter distribution characteristics and the vibration parameter distribution characteristics, the differences in magnetic flux density, current density, vibration displacement, and vibration acceleration at different locations are analyzed.

[0024] Optionally, before calculating the load matrix of the structural model based on electromagnetic principles using the structural model of the gas-insulated switchgear (GIS) high-voltage conductor connection mechanism and the electromagnetic excitation source, the method further includes:

[0025] Based on the structural parameters of the GIS high-voltage conductor connection mechanism, a structural model of the GIS high-voltage conductor connection mechanism is constructed.

[0026] Boundary conditions are applied to the structural model.

[0027] Optionally, the GIS high-voltage conductor connection mechanism includes a basin-type insulator, a conductor base, a housing, and a support; applying boundary conditions to the structural model includes:

[0028] The bolted connection structure between the basin insulator and the housing is simplified to define the boundary torus in the form of fixed and distributed stiffness;

[0029] The bolt connection structure of the conductor base of the basin insulator is simplified, and the bolts are fixed in the form of a transverse spring and a compression load.

[0030] The bottom surface of the bracket is set as a fixed boundary.

[0031] Optionally, the GIS high-voltage conductor connection mechanism includes a disconnector gas chamber, the disconnector gas chamber includes a perforated contact, and the application of boundary conditions to the structural model further includes:

[0032] The clamping spring of the plum blossom contact is simplified in terms of preload and radial stiffness, and the contact plate and retaining ring of the clamping spring are equivalent to a circumferential integral structure.

[0033] Optionally, the preset material parameters include Young's modulus and Poisson's ratio of the GIS high-voltage conductor connection mechanism material; determining the external Schrödinger stress matrix of the structural unit node based on the intravolume current density, electric displacement, electric field strength, magnetic induction intensity, intravolume, gradient operator, and Maxwell stress tensor of each structural unit node includes:

[0034] The external Schrörentz stress matrix of the structural element node is determined using the following formula:

[0035] In the formula, f i exc Let D be the external Schlorentz stress matrix of the structural element node. i E is the electric displacement. i J is the electric field strength. i B is the volumetric current density. i T represents the magnetic flux density. i Let dV be the Maxwell stress tensor, and dV be the volume within the element.

[0036] The load matrix of the structural model is determined by summing the externally applied Lorentz stress matrices of all the structural element nodes, including:

[0037] The load matrix of the structural model is determined using the following formula:

[0038] In the formula, N exc F represents the number of nodes in the structural unit. exc (t) is the load matrix.

[0039] Optionally, the preset material parameters include Young's modulus and Poisson's ratio of the GIS high-voltage conductor connection mechanism material; based on the preset material parameters and deformation compatibility relationship, the calculation of Lamé's first constant, Lamé's second constant, and Green's strain matrix includes:

[0040] The Lamé first constant, Lamé second constant, and Green strain matrix are calculated using the following formulas:

[0041] In the formula, λ S E is Lamé's first constant. S α represents the Young's modulus of the material used in GIS high-voltage conductor connection mechanisms. S Poisson's ratio for the material of the GIS high-voltage conductor connection mechanism;

[0042] In the formula, μ S It is Lamé's second constant;

[0043] In the formula, u Gi Let u be the Green strain matrix of the structural element. Si Let be the deformation gradient matrix of the structural element. Let I be the transpose of the deformation gradient matrix of the structural element, and let I be the identity matrix.

[0044] Based on the Lamé first constant, the Lamé second constant, and the Green strain matrix, the Caucthy stress matrix is ​​calculated according to the constitutive relations of elasticity, including:

[0045] The Caucthy stress matrix is ​​calculated using the following formula:

[0046] In the formula, σ Ci Let u be the Caucthy stress matrix of the structural element. S0i Let tr(u) be the determinant of the deformation gradient matrix of the structural element. Gi ) represents the trace of the Green strain matrix of the structural element;

[0047] Based on the Caucthy stress matrix and the load matrix, and using the elastic dynamics equations, the vibration displacement of the structural model in the mechanical field is calculated as follows:

[0048] The vibration displacement of the structural model in the mechanical field is calculated using the following formula:

[0049] In the formula, ρ i x is the material density of the structural unit. i Let d be the vibration displacement of the structural element, g be the acceleration due to gravity, and d be the acceleration due to gravity. i denoted as the damping coefficient of the structural unit.

[0050] The technical solution provided by this invention calculates the load matrix of the GIS high-voltage conductor connection mechanism in an electromagnetic field and inputs the calculated load matrix into a mechanical field as a mechanical field load excitation. Based on the elastic dynamics equations in the mechanical field, an "electromagnetic-mechanical" coupling relationship can be established, thereby constructing a simulation model of the GIS high-voltage conductor connection mechanism's "electromagnetic excitation source-vibration displacement". Then, the structural model of the GIS high-voltage conductor connection mechanism can be simulated based on the simulation model to determine the distribution characteristics of electromagnetic and vibration parameters. By analyzing these distribution characteristics, potential faults in each structural unit of the GIS high-voltage conductor connection mechanism can be predicted, and pre-maintenance can be performed on structural units with potential faults. This provides technical guidance for optimizing defect detection technology and analyzing abnormal vibration phenomena.

[0051] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 A flowchart illustrating a simulation method for a GIS high-voltage conductor connection mechanism provided in an embodiment of the present invention;

[0054] Figure 2 A flowchart illustrating another simulation method for a GIS high-voltage conductor connection mechanism provided in an embodiment of the present invention;

[0055] Figure 3 A flowchart illustrating a simulation method for another GIS high-voltage conductor connection mechanism provided in an embodiment of the present invention;

[0056] Figure 4 A flowchart illustrating a simulation method for another GIS high-voltage conductor connection mechanism provided in an embodiment of the present invention;

[0057] Figure 5 This is a front view of the busbar air chamber structure model of the "bolted" type connection mechanism provided in an embodiment of the present invention;

[0058] Figure 6 This is a perspective view of the busbar air chamber structure model of the "bolted" type connection mechanism provided in an embodiment of the present invention;

[0059] Figure 7 This is a front view of the isolating switch air chamber structure model of the "plug-in" type connection mechanism provided in an embodiment of the present invention;

[0060] Figure 8 This is a perspective view of the isolating switch air chamber structure model of the "plug-in" type connection mechanism provided in an embodiment of the present invention;

[0061] Figure 9 The simulation calculation results of the magnetic flux density distribution characteristics of the bus air chamber under a current of 1500A are provided in the embodiments of the present invention.

[0062] Figure 10 The simulation calculation results of the current density distribution characteristics of the busbar air chamber under a current of 1500A are provided in the embodiments of the present invention.

[0063] Figure 11 The simulation results of the magnetic flux density distribution characteristics of the disconnector switch gas chamber connection mechanism under a current of 1500A are provided in the embodiments of the present invention.

[0064] Figure 12 The simulation results of the current density distribution characteristics of the disconnector gas chamber connection mechanism under a current of 1500A are provided in the embodiments of the present invention.

[0065] Figure 13 The simulation results of the vibration displacement distribution characteristics of the disconnector switch gas chamber connection mechanism under a current of 1500A are provided in the embodiments of the present invention.

[0066] Figure 14 A cross-sectional view of the simulation calculation results of the vibration displacement distribution characteristics of the disconnector switch gas chamber connection mechanism under a current of 1500A provided in an embodiment of the present invention;

[0067] Figure 15 The simulation results of the vibration acceleration distribution characteristics of the disconnector switch gas chamber connection mechanism under a current of 1500A provided in the embodiments of the present invention;

[0068] Figure 16 This is a cross-sectional view of the simulation calculation results of the vibration acceleration distribution characteristics of the disconnector switch gas chamber connection mechanism under a current of 1500A, provided in an embodiment of the present invention.

[0069] Figure 17 The simulation calculation results of the vibration displacement distribution characteristics of the busbar air chamber connection mechanism under a current of 1500A are provided in the embodiments of the present invention.

[0070] Figure 18 A cross-sectional view of the simulation calculation results of the vibration displacement distribution characteristics of the busbar air chamber connection mechanism under a current of 1500A provided in an embodiment of the present invention;

[0071] Figure 19 The simulation results of the vibration acceleration distribution characteristics of the busbar air chamber connection mechanism under a current of 1500A are provided in the embodiments of the present invention.

[0072] Figure 20 This is a cross-sectional view of the simulation calculation results of the vibration acceleration distribution characteristics of the busbar air chamber connection mechanism under a current of 1500A, provided in an embodiment of the present invention.

[0073] Figure 21 This is a schematic diagram of the structure of a simulation device for a GIS high-voltage conductor connection mechanism provided in an embodiment of the present invention. Detailed Implementation

[0074] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0075] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0076] Figure 1 This is a flowchart illustrating a simulation method for a GIS high-voltage conductor connection mechanism according to an embodiment of the present invention. This embodiment is applicable to the simulation calculation of electromagnetic and mechanical fields of GIS equipment. The method can be executed by a simulation device for the GIS high-voltage conductor connection mechanism, which can be simulation software, such as finite element simulation software. See also... Figure 1 The simulation method includes:

[0077] S110. Based on the structural model of the GIS high-voltage conductor connection mechanism and the electromagnetic excitation source, calculate the load matrix of the structural model according to electromagnetic principles.

[0078] The GIS (Gas Insulator System) consists of circuit breakers, disconnect switches, grounding switches, instrument transformers, surge arresters, busbars, connectors, and outgoing terminals. All these devices and components are enclosed in a grounded metal casing filled with pressurized SF6 insulating gas; hence, it is also called an SF6 fully enclosed combined electrical appliance. The structural model of the GIS high-voltage conductor connection mechanism is a three-dimensional model drawn using 3D modeling software, referencing a real-world example device. The electromagnetic excitation source refers to the source that provides electromagnetic excitation to the structural model of the GIS high-voltage conductor connection mechanism in an electromagnetic field; for example, the electromagnetic excitation source can be an electric current.

[0079] Specifically, since the Lorentz force under alternating current is the mechanical factor that causes mechanical vibration of GIS, and the Lorentz force is the force experienced by moving charges in a magnetic field, the load matrix of the structural model is calculated based on the structural model of the GIS high-voltage conductor connection mechanism and electromagnetic excitation is provided to it in an electromagnetic field, based on the principles of electromagnetics. The load matrix can usually characterize the magnitude and distribution of the forces at different positions and directions of the structural model. When dynamic loads are involved, the load matrix helps to understand the dynamic response characteristics of the structure, such as vibration and impact.

[0080] S120. Based on the load matrix and the elastic dynamics equation, construct a simulation model of the "electromagnetic excitation source-vibration displacement" of the GIS high-voltage conductor connection mechanism.

[0081] Specifically, a dynamic linking database is used to input the load matrix calculated in the electromagnetic field into the mechanical field as the mechanical field load excitation. Based on the elastic dynamics equations in the mechanical field, an "electromagnetic-mechanical" coupling relationship is established, and finite element iterative calculations are performed using the Newton-Raphson iterative method to construct a simulation model of the "electromagnetic excitation source-vibration displacement" coupling of the GIS high-voltage conductor connection mechanism. Here, the electromagnetic excitation source refers to the electromagnetic field, and the vibration displacement refers to the mechanical field. Dynamic linking databases are a method of establishing a connection to a database at runtime. During program execution, connection parameters such as the database server, database name, and login credentials are dynamically determined according to actual needs and conditions, and then the connection to the database is established in real time.

[0082] S130. Simulate the structural model of the GIS high-voltage conductor connection mechanism based on the simulation model to determine the electromagnetic parameter distribution characteristics and vibration parameter distribution characteristics.

[0083] Specifically, based on the simulation model, the structural model of the GIS high-voltage conductor connection mechanism is simulated in the finite element simulation software, and the electromagnetic parameter distribution cloud map and vibration parameter distribution cloud map of the simulation model are output. The distribution of magnetic flux density and current density is analyzed through the electromagnetic parameter distribution cloud map, and the vibration displacement and vibration acceleration are analyzed through the vibration parameter distribution cloud map, providing technical guidance for the optimization of defect detection technology and the analysis of abnormal vibration phenomena.

[0084] The technical solution provided by this invention calculates the load matrix of the GIS high-voltage conductor connection mechanism in an electromagnetic field and inputs the calculated load matrix into a mechanical field as a mechanical field load excitation. Based on the elastic dynamics equations in the mechanical field, an "electromagnetic-mechanical" coupling relationship can be established, thereby constructing a simulation model of the GIS high-voltage conductor connection mechanism's "electromagnetic excitation source-vibration displacement". Then, the structural model of the GIS high-voltage conductor connection mechanism can be simulated based on the simulation model to determine the distribution characteristics of electromagnetic and vibration parameters. By analyzing these distribution characteristics, potential faults in each structural unit of the GIS high-voltage conductor connection mechanism can be predicted, and pre-maintenance can be performed on structural units with potential faults. This provides technical guidance for optimizing defect detection technology and analyzing abnormal vibration phenomena.

[0085] Figure 2 This is a flowchart illustrating another simulation method for a GIS high-voltage conductor connection mechanism provided by an embodiment of the present invention. This embodiment further refines the aforementioned embodiments. The GIS high-voltage conductor connection mechanism includes multiple structural units, which are connected to each other. (See also...) Figure 2 The simulation method includes:

[0086] S210. Determine the external Schrorentz stress matrix of each structural unit node based on the current density, electric displacement, electric field strength, magnetic induction intensity, unit volume, and Maxwell stress tensor within the volume of each structural unit node under electromagnetic excitation source.

[0087] Among them, the current density, electric displacement, electric field strength, magnetic induction intensity, volume within the element, and Maxwell stress tensor are all calculated based on electromagnetic principles using electromagnetic excitation sources.

[0088] Specifically, the external Schrörentz stress matrix of the structural element nodes is determined using the following formula:

[0089] In the formula, f i exc Let D be the external Schlorentz stress matrix of the structural element node. i E is the electric displacement. i J is the electric field strength.i B is the volumetric current density. i T represents the magnetic flux density. i Let dV be the Maxwell stress tensor and dV be the volume within the element.

[0090] S220. Iterate the external Schrödinger stress matrix of the structural unit node according to the first preset iteration condition.

[0091] The first preset iteration condition can be set based on a preset number of iterations, or it can be set based on ensuring that the Lorentz stress matrix gradually approaches the accurate solution during the iteration process and converges within an acceptable error range. Here, the Newton-Raphson iteration method is used to implement finite element iterative calculations.

[0092] S230. Determine whether the iteration of the external Schrödinger stress matrix has ended. If yes, proceed to S240; otherwise, return to S210.

[0093] S240. Determine the load matrix of the structural model based on the sum of the externally applied Lorentz stress matrices of all structural unit nodes.

[0094] Specifically, the load matrix of the structural model is determined using the following formula:

[0095] In the formula, N exc F represents the number of nodes in the structural unit. exc (t) is the load matrix.

[0096] S250. When the GIS high-voltage conductor connection mechanism is made of linear elastic material, the Lamé first constant, Lamé second constant and Green strain matrix are calculated based on the deformation compatibility relationship according to the preset material parameters.

[0097] The preset material parameters include material type, material density, Young's modulus, and Poisson's ratio. These preset material parameters can be set in advance. Deformation compatibility is generally understood as imagining a deformable solid divided into multiple parts, each of which can be deformed in many ways. If these deformed pieces are sequentially combined, many gaps will typically appear, preventing the reassembly into a continuous solid. To ensure the combined shape matches the original continuous solid, the deformation of each piece cannot be arbitrarily handled; certain conditions must be met. The mathematical expression for these conditions is called the deformation compatibility relationship.

[0098] Specifically, the Lamé first constant, Lamé second constant, and Green strain matrix are calculated using the following formulas:

[0099] In the formula, λS E is Lamé's first constant. S α represents the Young's modulus of the material used in GIS high-voltage conductor connection mechanisms. S Poisson's ratio for the material of the GIS high-voltage conductor connection mechanism;

[0100] In the formula, μ S It is Lamé's second constant;

[0101] In the formula, u Gi Let u be the Green strain matrix of the structural element. Si Let be the deformation gradient matrix of the structural element. Let be the transpose of the deformation gradient matrix of the structural element, and I be the preset current.

[0102] S260. Based on Lamé's first constant, Lamé's second constant, and Green's strain matrix, calculate the Caucthy stress matrix according to the constitutive relation of elasticity.

[0103] Specifically, the Caucthy stress matrix is ​​calculated using the following formula:

[0104] In the formula, σ Ci Let u be the Caucthy stress matrix of the structural element. S0i Let tr(u) be the determinant of the deformation gradient matrix of the structural element. Gi ) represents the trace of the Green strain matrix of the structural element.

[0105] S270. Based on the Caucthy stress matrix and load matrix, and using the elastic dynamics equations, calculate the vibration displacement of the structural model in the mechanical field.

[0106] Specifically, the load matrix calculated in the electromagnetic field is used as the mechanical field excitation. When the GIS high-voltage conductor connection mechanism is a linear elastic material, the elastic dynamic equation can be converted into a unit equilibrium differential equation, and then the vibration displacement of the structural model in the mechanical field can be calculated through the unit equilibrium differential equation.

[0107] The elastic dynamics equation should satisfy the following equation:

[0108] In the formula, M, C, and K are the mass, damping, and stiffness matrices of the system, respectively. X(t) and F are the time-varying acceleration, time-varying velocity, and time-varying displacement matrices of the structural element nodes, respectively. exc(t) represents the load matrix; however, when the GIS high-voltage conductor connection mechanism is made of a linear elastic material, the elastic dynamics equation can be transformed into an element equilibrium differential equation, and then the vibration displacement of the structural model in the mechanical field can be calculated using the element equilibrium differential equation. The element equilibrium differential equation should satisfy the following equation:

[0109] In the formula, ρ i x is the material density of the structural unit. i Let d be the vibration displacement of the structural element, g be the acceleration due to gravity, and d be the acceleration due to gravity. i denoted as the damping coefficient of the structural unit.

[0110] S280. Iterate the vibration displacement of the structural model in the mechanical field according to the second preset iteration conditions.

[0111] The second preset iteration condition can be set based on a preset number of iterations, or it can be set based on ensuring that the vibration displacement gradually approaches the accurate solution during the iteration process and converges within an acceptable error range. Here, the Newton-Raphson iteration method is used to implement finite element iterative calculations.

[0112] S290. Determine whether the vibration displacement iteration has ended. If yes, execute S291; otherwise, return to execute S250.

[0113] S291, Output electromagnetic parameter distribution characteristics and vibration parameter distribution characteristics.

[0114] The technical solution provided by this invention uses the Newton-Raphson method to perform finite element iterative calculation of the external Schering-Lorentz stress matrix of each structural unit node. Based on the sum of the external Schering-Lorentz stress matrices of all structural units, the load matrix of the structural model is determined. The load matrix is ​​used as a mechanical field excitation, and combined with the elastic dynamics equation, the vibration displacement of the structural model is determined. Then, the electromagnetic parameter distribution characteristics and vibration parameter distribution characteristics are output, further providing technical guidance for the optimization of defect detection technology and the analysis of abnormal vibration phenomena.

[0115] Figure 3 This is a flowchart illustrating a simulation method for a GIS high-voltage conductor connection mechanism, provided by an embodiment of the present invention. This embodiment further refines the aforementioned embodiments. See also... Figure 3 The simulation method includes:

[0116] S310. Based on the structural parameters of the GIS high-voltage conductor connection mechanism, construct a structural model of the GIS high-voltage conductor connection mechanism.

[0117] The structural parameters include structural dimensions and shape; referencing the actual equipment, a structural model of the GIS high-voltage conductor connection mechanism is constructed in 3D modeling software based on the dimensions and shape of the GIS high-voltage conductor connection mechanism.

[0118] S320. Apply boundary conditions to the structural model.

[0119] Specifically, GIS includes air chambers such as busbars, isolating / grounding switches, circuit breakers, and current / voltage transformers. This invention focuses on "bolted" and "plug-in" connection mechanisms. The "bolted" connection mechanism, represented by the busbar air chamber, mainly includes a guide rod, contact spring, shield, conductor base, basin-type insulator, shell, and support. The "plug-in" connection mechanism, represented by the isolating switch, mainly includes a guide rod, plum blossom contact, clamping spring, conductor base, basin-type insulator, and shell. The conductor material is conductive copper, the shell material is non-magnetic cast steel, and the insulator material is epoxy resin. The shell, conductor base, and basin-type insulator are fastened with bolts, while the plum blossom contact and guide rod are pre-tightened with clamping springs and plugged in. To improve the convergence and efficiency of the vibration calculation model for GIS high-voltage conductor connection mechanisms, the following provisions are made: The bolted connection structure of the basin insulator and the shell is simplified, and the boundary torus is defined in the form of fixed and distributed stiffness; the bolted structure of the conductor base of the basin insulator is simplified, and the bolts are equivalently fixed in the form of transverse springs and compression loads; the clamping spring of the plum blossom contact is simplified in the form of preload and radial stiffness, and the contact plate and retaining ring of the clamping spring are equivalent to a circumferential integral structure; the lower surface of the support is set as a fixed boundary; the main components such as the guide rod, plum blossom contact, conductor base, shell, and basin insulator are retained; all materials are linear elastic materials, and the influence of structural damping is ignored.

[0120] S330. Based on the structural model of the GIS high-voltage conductor connection mechanism and the electromagnetic excitation source, calculate the load matrix of the structural model according to electromagnetic principles.

[0121] S340. Based on the load matrix and the elastic dynamics equation, construct a simulation model of the "electromagnetic excitation source-vibration displacement" of the GIS high-voltage conductor connection mechanism.

[0122] S350. Simulate the structural model of the GIS high-voltage conductor connection mechanism based on the simulation model to determine the electromagnetic parameter distribution characteristics and vibration parameter distribution characteristics.

[0123] S360. Based on the electromagnetic parameter distribution characteristics and vibration parameter distribution characteristics, analyze the differences in magnetic flux density, current density, vibration displacement, and vibration acceleration at different locations.

[0124] Among them, electromagnetic parameters include parameters such as magnetic flux density and current density, and vibration parameters include parameters such as vibration displacement and vibration acceleration. Specifically, based on the distribution characteristics of electromagnetic parameters and vibration parameters, the differences in magnetic flux density, current density, vibration displacement and vibration acceleration at different locations are analyzed, thereby providing technical guidance for the optimization of defect detection technology and the analysis of abnormal vibration phenomena.

[0125] The simulation method for the GIS high-voltage conductor connection mechanism provided by the present invention will be described in detail below with reference to a specific embodiment. Taking the disconnector gas chamber and busbar gas chamber as examples, the effectiveness of the simulation method provided by the present invention will be verified. Figure 4 A flowchart of a simulation method for another GIS high-voltage conductor connection mechanism provided in an embodiment of the present invention is available. Figure 4 The simulation method includes:

[0126] S410, Parameter Settings.

[0127] S420, Apply boundary conditions.

[0128] S430, Lorentz force calculation.

[0129] This includes calculating the current density J, magnetic flux density B, magnetic induction H, Maxwell stress tensor T, and Lorentz force matrix f. i .

[0130] S440. Determine whether the Lorentz force calculation has finished iterating. If not, return to execute S430; if yes, execute S450.

[0131] S450 outputs the electromagnetic field calculation results.

[0132] S460: Apply loads to the mechanical field by passing the electromagnetic field output results through a dynamic link database.

[0133] S470, Perform mechanical field calculations.

[0134] S480. Determine whether the mechanical field calculation has finished iterating. If yes, execute S490; otherwise, return to execute S470.

[0135] S490, Output the mechanical field calculation results.

[0136] For example, the effectiveness of this invention is verified using the disconnector gas chamber and the busbar gas chamber as examples: Figure 5 This is a front view of the busbar air chamber structure model of the "bolted" type connection mechanism provided in an embodiment of the present invention. Figure 6 This is a perspective view of the busbar air chamber structure model of the "bolted" type connection mechanism provided in an embodiment of the present invention. Figure 7This is a front view of the isolating switch air chamber structure model of the "plug-in" type connection mechanism provided in an embodiment of the present invention. Figure 8 This is a perspective view of the isolating switch chamber structure model of the "plug-in" type connection mechanism provided in an embodiment of the present invention; see also Figure 5 , Figure 6 , Figure 7 and Figure 8 The initial acceleration values ​​of the structure in all coordinate directions are set to zero. Electromagnetic and vibration parameter simulations of the two types of air chambers are performed in the frequency domain. The material, geometric, and operating parameters are set with reference to the real equipment. The specific technical parameters of the model are shown in Table 1 below.

[0137] Table 1

[0138]

[0139] Figure 9 The above are simulation results of the magnetic flux density distribution characteristics of the busbar air chamber under a current of 1500A, provided by an embodiment of the present invention. Figure 10 The above are simulation results of the current density distribution characteristics of the busbar air chamber under a current of 1500A, provided in an embodiment of the present invention. Figure 11 The above are simulation results of the magnetic flux density distribution characteristics of the disconnector gas chamber connection mechanism under a current of 1500A, provided in an embodiment of the present invention. Figure 12 The figures show the simulation results of the current density distribution characteristics of the disconnector switch gas chamber connection mechanism under a current of 1500A, as provided in this embodiment of the invention. As can be seen from the figures, the electromagnetic parameter distribution characteristics of the busbar and disconnector switch gas chamber are strongly correlated with the connection mechanism: strong amplitude distributions exist in the busbar conductor base, the disconnector switch's pentagonal contact fingers, and the guide rod area, especially at the current convergence point of the internal conductor structure, where the current density amplitude is the largest, and the magnetic flux density is high at the contact points of the base and contact fingers. The "conductor base-pentagonal contact finger-guide rod" connection mechanism inside the disconnector switch gas chamber forms a current conduction zone, while the magnetic flux and current density on the grounding switch side are smaller; the magnetic flux is mainly distributed on the surface of the current-carrying conductor inside the gas chamber, with smaller amplitudes in the insulator and shell areas.

[0140] Figure 13 The above are simulation results of the vibration displacement distribution characteristics of the disconnector switch gas chamber connection mechanism under a current of 1500A, provided in an embodiment of the present invention. Figure 14 This is a cross-sectional view showing the simulation calculation results of the vibration displacement distribution characteristics of the disconnector switch gas chamber connection mechanism under a current of 1500A, provided in an embodiment of the present invention. Figure 15 The above are simulation results of the vibration acceleration distribution characteristics of the disconnector switch gas chamber connection mechanism under a current of 1500A, provided in an embodiment of the present invention. Figure 16 This is a cross-sectional view of the simulation calculation results of the vibration acceleration distribution characteristics of the disconnector switch gas chamber connection mechanism under a current of 1500A, provided in an embodiment of the present invention. Figure 17The simulation calculation results of the vibration displacement distribution characteristics of the busbar air chamber connection mechanism under a current of 1500A are provided in the embodiments of the present invention. Figure 18 A cross-sectional view of the simulation calculation results of the vibration displacement distribution characteristics of the busbar air chamber connection mechanism under a current of 1500A provided in an embodiment of the present invention; Figure 19 The simulation results of the vibration acceleration distribution characteristics of the busbar air chamber connection mechanism under a current of 1500A are provided in the embodiments of the present invention. Figure 20 This is a cross-sectional view of the simulation calculation results of the vibration acceleration distribution characteristics of the busbar air chamber connection mechanism under a current of 1500A, provided by an embodiment of the present invention. As shown in the figure, the vibration displacement amplitude of the high-voltage conductor connection mechanism of the two air chambers is in the range of 10⁻⁷ to 10⁻⁵ m (micrometer level), and the vibration acceleration amplitude is in the range of 10⁻³ to 10⁻¹ m / s² (millimeters level). Therefore, the acceleration signal is more sensitive to vibration information detection. The amplitude of the conductors inside the busbar and disconnector is generally greater than that of the outer shell, and shows a gradually decreasing trend, which is related to the large Lorentz force generated by the current flow through the internal conductors. The vibration amplitude of the connection between the plum blossom contact and the guide rod in the disconnector air chamber is greater than that of the internal conductor because the constraint stiffness of the plum blossom contact is provided by a spring, which has good spatial recovery. In addition, the current flow area of ​​the plum blossom contact and the guide rod is small, and the current contraction effect is more obvious. The conductors of the busbar air chamber show a form of concentration from the middle to both ends, especially with a larger amplitude at the base end. Therefore, the vibration amplitude of GIS is strongly correlated with its structural form. Especially at the contact points of high-voltage conductor connection mechanisms, the convergence of current and the shrinking of the contact area lead to an increase in the Lorentz force, driving the structure to produce a strong vibration response. On the other hand, the constraint stiffness of the structure, its spatial degrees of freedom, and vibration propagation are also key factors affecting its vibration amplitude. For example, even though there is no current flowing through the conductor on the grounding switch side, a relatively strong vibration amplitude is still distributed.

[0141] Figure 21 This is a schematic diagram of the structure of a simulation device for a GIS high-voltage conductor connection mechanism provided in an embodiment of the present invention. (See attached diagram.) Figure 21 The simulation device includes: a calculation module 2110, a construction module 2120, and a simulation module 2130.

[0142] The calculation module 2110 is used to calculate the load matrix of the structural model based on the electromagnetic principle, according to the structural model of the high-voltage conductor connection mechanism of the gas-insulated switchgear (GIS) and the electromagnetic excitation source.

[0143] Module 2120 is used to construct a simulation model of the “electromagnetic excitation source-vibration displacement” of the GIS high-voltage conductor connection mechanism based on the load matrix and the elastic dynamic equation.

[0144] The simulation module 2130 is used to simulate the structural model of the GIS high-voltage conductor connection mechanism based on the simulation model, and to determine the electromagnetic parameter distribution characteristics and vibration parameter distribution characteristics.

[0145] The simulation device for the GIS high-voltage conductor connection mechanism provided in this embodiment of the invention can execute the simulation method for the GIS high-voltage conductor connection mechanism provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0146] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0147] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A simulation method for a GIS high-voltage conductor connection mechanism, characterized in that, include: Based on the pre-constructed structural model of the gas-insulated fully enclosed combined electrical equipment GIS high-voltage conductor connection mechanism and the electromagnetic excitation source, the load matrix of the structural model is calculated according to electromagnetic principles. Based on the load matrix and the elastic dynamics equation, a simulation model of "electromagnetic excitation source-vibration displacement" for the GIS high-voltage conductor connection mechanism is constructed. The structural model of the GIS high-voltage conductor connection mechanism is simulated based on the simulation model to determine the electromagnetic parameter distribution characteristics and vibration parameter distribution characteristics. The GIS high-voltage conductor connection mechanism includes multiple structural units, which are connected to each other. The calculation of the load matrix of the structural model based on the pre-constructed structural model of the gas-insulated fully enclosed combined electrical equipment GIS high-voltage conductor connection mechanism and the electromagnetic excitation source, using electromagnetic principles, includes: The external Schlorentz stress matrix of each structural unit node is determined based on the in-volume current density, electric displacement, electric field strength, magnetic induction intensity, in-unit volume, gradient operator, and Maxwell stress tensor of each structural unit node under the electromagnetic excitation source. The load matrix of the structural model is determined by summing the external Schrödinger stress matrices of all the structural unit nodes. When the GIS high-voltage conductor connection mechanism is made of a linear elastic material, the simulation model of the GIS high-voltage conductor connection mechanism based on the load matrix and the elastic dynamics equation includes: Based on the preset material parameters and deformation compatibility relationship, calculate Lamé's first constant, Lamé's second constant, and Green's strain matrix; Based on the Lamé first constant, the Lamé second constant, and the Green strain matrix, the Caucthy stress matrix is ​​calculated according to the constitutive relation of elasticity. Based on the Caucthy stress matrix and the load matrix, and using the elastic dynamics equations, the vibration displacement of the structural model in the mechanical field is calculated.

2. The simulation method according to claim 1, characterized in that, After determining the external Schrödinger stress matrix of the structural unit node based on the in-volume current density, electric displacement, electric field strength, magnetic induction intensity, in-unit volume, gradient operator, and Maxwell stress tensor of each structural unit node under the electromagnetic excitation source, the method further includes: The external Schrörentz stress matrix of the structural unit node is iterated according to the first preset iteration condition; Determine whether the iteration of the external Schrödinger stress matrix has ended. If not, return to the step of determining the external Schrödinger stress matrix of the structural unit node. After calculating the vibration displacement of the structural model in the mechanical field based on the Caucthy stress matrix and the load matrix and the elastic dynamics equations, the method further includes: The vibration displacement of the structural model in the mechanical field is iterated according to the second preset iteration condition; Determine whether the vibration displacement iteration has ended. If not, return to the steps of calculating Lamé's first constant, Lamé's second constant, and Green's strain matrix.

3. The simulation method according to claim 1, characterized in that, After simulating the structural model of the GIS high-voltage conductor connection mechanism based on the simulation model to determine the electromagnetic parameter distribution characteristics and vibration parameter distribution characteristics, the method further includes: Based on the electromagnetic parameter distribution characteristics and the vibration parameter distribution characteristics, the differences in magnetic flux density, current density, vibration displacement, and vibration acceleration at different locations are analyzed.

4. The simulation method according to claim 1, characterized in that, Before calculating the load matrix of the structural model based on electromagnetic principles using the pre-constructed structural model of the gas-insulated fully enclosed combined electrical equipment (GIS) high-voltage conductor connection mechanism and the electromagnetic excitation source, the following steps are also included: Based on the structural parameters of the GIS high-voltage conductor connection mechanism, a structural model of the GIS high-voltage conductor connection mechanism is constructed. Boundary conditions are applied to the structural model.

5. The simulation method according to claim 4, characterized in that, The GIS high-voltage conductor connection mechanism includes a basin-type insulator, a conductor base, a housing, and a support; the boundary conditions applied to the structural model include: The bolted connection structure between the basin insulator and the housing is simplified to define the boundary torus in the form of fixed and distributed stiffness; The bolt connection structure between the basin insulator and the conductor base is simplified, and the bolts are fixed in the form of a transverse spring and a compression load. The bottom surface of the bracket is set as a fixed boundary.

6. The simulation method according to claim 5, characterized in that, The GIS high-voltage conductor connection mechanism includes a disconnector gas chamber, the disconnector gas chamber includes a perforated contact, and the application of boundary conditions to the structural model further includes: The clamping spring of the plum blossom contact is simplified in terms of preload and radial stiffness, and the contact plate and retaining ring of the clamping spring are equivalent to a circumferential integral structure.

7. The simulation method according to claim 1, characterized in that, The determination of the external Schrödinger stress matrix of each structural unit node based on the in-volume current density, electric displacement, electric field strength, magnetic induction intensity, in-unit volume, gradient operator, and Maxwell stress tensor under the electromagnetic excitation source includes: The external Schrörentz stress matrix of the structural element node is determined using the following formula: In the formula, Here is the external Schlorentz stress matrix of the structural element node. For electric displacement, For electric field strength, The volumetric current density, It represents the magnetic flux density. For Maxwell's stress tensor, The volume within the unit; The load matrix of the structural model is determined by summing the external Schrödinger stress matrices of all the structural element nodes, including: The load matrix of the structural model is determined using the following formula: In the formula, The number of nodes in the structural unit. This is the load matrix.

8. The simulation method according to claim 1, characterized in that, The preset material parameters include Young's modulus and Poisson's ratio of the GIS high-voltage conductor connection mechanism material; Based on the preset material parameters and deformation compatibility relationship, the Lamé first constant, Lamé second constant, and Green strain matrix are calculated, including: The Lamé first constant, Lamé second constant, and Green strain matrix are calculated using the following formulas: In the formula, Let Lamé be the first constant. The Young's modulus of the material used in GIS high-voltage conductor connection mechanisms. Poisson's ratio for the material of the GIS high-voltage conductor connection mechanism; In the formula, It is Lamé's second constant; In the formula, The Green strain matrix of the structural element. Let be the deformation gradient matrix of the structural element. Let be the transpose of the deformation gradient matrix of the structural element. It is the identity matrix; Based on the Lamé first constant, the Lamé second constant, and the Green strain matrix, the Caucthy stress matrix is ​​calculated according to the constitutive relations of elasticity, including: The Caucthy stress matrix is ​​calculated using the following formula: In the formula, The Caucthy stress matrix of the structural element. Let be the determinant of the deformation gradient matrix of the structural element. The trace of the Green strain matrix of the structural element; Based on the Caucthy stress matrix and the load matrix, and using the elastic dynamics equations, the vibration displacement of the structural model in the mechanical field is calculated as follows: The vibration displacement of the structural model in the mechanical field is calculated using the following formula: In the formula, The material density of the structural unit. The vibration displacement of the structural unit. It is the acceleration due to gravity. denoted as the damping coefficient of the structural unit.

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