Simulation method of GIS high-voltage conductor connecting mechanism

Abstract

The invention 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 based on an electromagnetic principle according to the structure model of a high-voltage conductor connecting mechanism of gas insulated switchgear (GIS) and an electromagnetic excitation source; constructing an electromagnetic excitation source-vibration displacement simulation model of the GIS high-voltage conductor connecting mechanism based on an elastic kinetic equation according to the load matrix; and simulating the structure model of the GIS high-voltage conductor connecting mechanism according to the simulation model, and determining electromagnetic parameter distribution characteristics and vibration parameter distribution characteristics. According to the technical scheme provided by the embodiment of the invention, pre-judgment of possible fault hidden dangers of each structural unit of the GIS high-voltage conductor connecting mechanism is realized, and technical guidance is provided for defect detection technology optimization and abnormal vibration phenomenon analysis.

Description

Technical Field

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

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

[0003] At present, the research on the vibration behavior mechanism of power equipment focuses on obvious vibration abnormal mechanisms such as coil equipment, pantograph-net electrical contact and circuit breaker operating mechanism, while the relevant research on the nonlinear characteristics of mechanical vibration defects of GIS high-voltage conductor connection mechanism has not been reported, and there is a lack of technical guidance in the optimization of defect detection technology and the analysis of abnormal vibration phenomena. Summary of the invention

[0004] The present invention provides a simulation method for a GIS high-voltage conductor connection mechanism to solve the problem that the prior art lacks technical guidance in the optimization of defect detection technology and the analysis of abnormal vibration phenomena.

[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] According to the structural model of the high-voltage conductor connection mechanism of the gas insulated switchgear (GIS) and the electromagnetic excitation source based on the electromagnetic principle, the load matrix of the structural model is calculated;

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

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

[0009] Optionally, the GIS high-voltage conductor connection mechanism includes a plurality of structural units, and different structural units are connected to each other; the load matrix of the structural model is calculated based on the electromagnetic principle according to the pre-constructed structural model of the high-voltage conductor connection mechanism of the gas insulated switchgear (GIS) and the electromagnetic excitation source, including:

[0010] Determine the external Schlorentz stress matrix of each structural unit node according to the volume current density, electric displacement, electric field intensity, magnetic induction intensity, 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 according to the sum of the externally applied Lorentz stress matrices of all the structural unit nodes.

[0012] Optionally, when the GIS high-voltage conductor connection mechanism is a linear elastic material, constructing a simulation model of "electromagnetic excitation source-vibration displacement" of the GIS high-voltage conductor connection mechanism based on the elastic dynamics equation according to the load matrix includes:

[0013] According to the preset material parameters and based on the deformation coordination relationship, the Lamé first constant, Lamé second constant and Green strain matrix are calculated;

[0014] Calculate the Caucthy stress matrix based on the constitutive relationship of elastic mechanics according to the first Lamé constant, the second Lamé constant and the Green strain matrix;

[0015] According to the Caucthy stress matrix and the load matrix, based on the elastic dynamics equation, the vibration displacement of the structural model in the mechanical field is calculated.

[0016] Optionally, after determining the external Schlorentz stress matrix of the structural unit node according to the volumetric current density, electric displacement, electric field intensity, magnetic induction intensity, unit volume, gradient operator and Maxwell stress tensor of each structural unit node, the method further includes:

[0017] Iterating the external Schlorentz stress matrix of the structural unit node according to a first preset iteration condition;

[0018] Determine whether the iteration of the external Schlorentz stress matrix is ​​completed, and if not, return to the step of determining the external Schlorentz stress matrix of the structural unit node according to the volume current density, electric displacement, electric field intensity, magnetic induction intensity, unit volume, 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 according to the Caucthy stress matrix and the load matrix based on the elastic dynamics equation, the method further includes:

[0020] Iterating the vibration displacement of the structural model in the mechanical field according to a second preset iteration condition;

[0021] It is determined whether the vibration displacement iteration is completed. If not, the process returns to the step of calculating the Lamé first constant, the Lamé second constant and the Green strain matrix based on the deformation coordination relationship according to the preset material parameters.

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

[0023] According to the electromagnetic parameter distribution characteristics and the vibration parameter distribution characteristics, the difference characteristics of magnetic flux density, current density, vibration displacement and vibration acceleration at different positions are analyzed.

[0024] Optionally, before calculating 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, the method further includes:

[0025] According to 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 imposed on the structural model.

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

[0028] Simplifying the bolt connection structure between the pot insulator and the housing, and defining the boundary annulus in the form of fixed and distributed stiffness;

[0029] Simplify the bolt connection structure of the conductor base of the pot-type insulator, and fix the bolts in the form of transverse springs and crimping loads;

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

[0031] Optionally, the GIS high-voltage conductor connection mechanism includes an isolating switch air chamber, the isolating switch air chamber includes a plum blossom contact, and applying boundary conditions to the structural model further includes:

[0032] The spring structure of the hoop spring of the plum blossom contact is simplified in the form of preload and radial stiffness, and the contact piece and the clamping ring of the hoop spring are equivalent to an annular 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; the determining of the external Schlorentz stress matrix of the structural unit node according to the volumetric current density, electric displacement, electric field intensity, magnetic induction intensity, unit volume, gradient operator and Maxwell stress tensor of each structural unit node includes:

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

[0035] In the formula, f i exc is the external Schlorentz stress matrix of the structural unit node, D i is the electric displacement, E i is the electric field strength, J i is the current density in the volume, B i is the magnetic induction intensity, T i is the Maxwell stress tensor, dV is the volume inside the unit;

[0036] Determining the load matrix of the structural model according to the sum of the externally applied Lorentz stress matrices of all the structural unit nodes includes:

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

[0038] Where N exc is the number of structural unit nodes, F 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; and calculating the Lamé first constant, the Lamé second constant and the Green strain matrix based on the preset material parameters and the deformation coordination relationship includes:

[0040] The following formulas are used to calculate the Lamé first constant, Lamé second constant and Green strain matrix:

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

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

[0043] In the formula, u Gi is the Green strain matrix of the structural unit, u Si is the deformation gradient matrix of the structural unit, is the transposed matrix of the deformation gradient matrix of the structural unit, and I is the unit matrix;

[0044] According to the first Lamé constant, the second Lamé constant and the Green strain matrix, based on the elastic mechanics constitutive relationship, calculating the Caucthy stress matrix includes:

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

[0046] In the formula, σ Ci is the Caucthy stress matrix of the structural unit, u S0i is the determinant of the deformation gradient matrix of the structural unit, tr(u Gi ) is the trace of the Green strain matrix of the structural unit;

[0047] According to the Caucthy stress matrix and the load matrix, based on the elastic dynamics equation, calculating the vibration displacement of the structural model in the mechanical field includes:

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

[0049] In the formula, ρ i is the material density of the structural unit, x i is the vibration displacement of the structural unit, g is the gravitational acceleration, d i is the damping coefficient of the structural unit.

[0050] The technical solution provided by the embodiment of the present invention calculates the load matrix of the GIS high-voltage conductor connection mechanism in the electromagnetic field, and inputs the load matrix calculated in the electromagnetic field into the mechanical field as the mechanical field load excitation. Based on the elastic dynamics equation in the mechanical field, an "electromagnetic-mechanical" coupling relationship can be established, and then a simulation model of the "electromagnetic excitation source-vibration displacement" of the GIS high-voltage conductor connection mechanism can be constructed. Then, the structural model of the GIS high-voltage conductor connection mechanism can be simulated according to the simulation model to determine the electromagnetic parameter distribution characteristics and the vibration parameter distribution characteristics. By analyzing the electromagnetic parameter distribution characteristics and the vibration parameter distribution characteristics, it is possible to predict the potential fault hazards of each structural unit of the GIS high-voltage conductor connection mechanism, and perform pre-maintenance on the structural units that may have potential fault hazards, providing technical guidance for the optimization of defect detection technology and the analysis of abnormal vibration phenomena.

[0051] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

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

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

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

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

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

[0059] Figure 7 A front view of the air chamber structure model of the disconnector switch of the "plug-in" type connection mechanism provided by an embodiment of the present invention;

[0060] Figure 8 An oblique view of the air chamber structure model of the disconnector switch of the "plug-in" type connection mechanism provided by an embodiment of the present invention;

[0061] Fig. 9 The simulation calculation results of the magnetic flux density distribution characteristics of the busbar air chamber under 1500A current provided by the embodiment of the present invention;

[0062] Fig.10 The simulation calculation results of the current density distribution characteristics of the busbar gas chamber at 1500A current provided by the embodiment of the present invention;

[0063] Fig.11 The simulation calculation results of the magnetic flux density distribution characteristics of the air chamber connection mechanism of the isolating switch under 1500A current provided by the embodiment of the present invention;

[0064] Fig.12 The simulation calculation results of the current density distribution characteristics of the air chamber connection mechanism of the isolating switch under the current of 1500A provided in the embodiment of the present invention;

[0065] Fig.13 The simulation calculation results of the vibration displacement distribution characteristics of the air chamber connection mechanism of the isolating switch under 1500A current provided by the embodiment of the present invention;

[0066] Fig.14 A cross-sectional view of simulation calculation results of vibration displacement distribution characteristics of the air chamber connection mechanism of the disconnector under 1500A current provided by an embodiment of the present invention;

[0067] Fig.15 The simulation calculation results of the vibration acceleration distribution characteristics of the air chamber connection mechanism of the isolating switch under 1500A current provided by the embodiment of the present invention;

[0068] Fig.16 A cross-sectional diagram of simulation calculation results of vibration acceleration distribution characteristics of the air chamber connection mechanism of the isolating switch under 1500A current provided by an embodiment of the present invention;

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

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

[0071] Fig.19 The simulation calculation results of the vibration acceleration distribution characteristics of the busbar air chamber connection mechanism under 1500A current provided in the embodiment of the present invention;

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

[0073] Fig.21 A schematic structural diagram of a simulation device for a GIS high-voltage conductor connection mechanism provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0074] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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 and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0076] Figure 1 The flowchart of a simulation method of a GIS high-voltage conductor connection mechanism provided by an embodiment of the present invention is applicable to the simulation calculation field of electromagnetic field and mechanical field of GIS equipment. The method can be executed by a simulation device of a GIS high-voltage conductor connection mechanism, and the simulation device can be a simulation software, for example, the simulation software can be a finite element simulation software. Figure 1 , the simulation method includes:

[0077] S110. Calculate the load matrix of the structural model based on the electromagnetic principle according to the structural model of the GIS high-voltage conductor connection mechanism and the electromagnetic excitation source.

[0078] Among them, GIS is composed of circuit breakers, disconnectors, grounding switches, mutual inductors, lightning arresters, busbars, connectors and outgoing line terminals. All these devices or components are enclosed in a metal grounded casing, which is filled with SF6 insulating gas at a certain pressure, so it is also called SF6 fully enclosed combination electrical appliances. The structural model of the GIS high-voltage conductor connection mechanism is a three-dimensional model drawn based on three-dimensional mapping software with reference to the real equipment. The electromagnetic excitation source refers to providing electromagnetic excitation in the electromagnetic field for the structural model of the GIS high-voltage conductor connection mechanism. For example, the electromagnetic excitation source can be current.

[0079] Specifically, since the Lorentz force under the action of alternating current is the mechanical factor that causes mechanical vibration of GIS, and the Lorentz force is the force exerted on the moving charge in the 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 for it in the electromagnetic field based on the principles of electromagnetics. The load matrix can usually characterize the magnitude and distribution of the forces exerted on the structural model at different positions and directions. 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. According to the load matrix and based on the elastic dynamics equation, a simulation model of "electromagnetic excitation source-vibration displacement" of the GIS high-voltage conductor connection mechanism is constructed.

[0081] Specifically, a dynamic link 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 equation in the mechanical field, an "electromagnetic-mechanical" coupling relationship is established, and the finite element iterative calculation is realized through the Newton-Raphson iteration method, thereby constructing a simulation model of the "electromagnetic excitation source-vibration displacement" coupling of the GIS high-voltage conductor connection mechanism. The electromagnetic excitation source here refers to the electromagnetic field, and the vibration displacement refers to the mechanical field. A dynamic link database is a way to establish a connection with a database at runtime. During the program running process, the connection parameters such as the database server to be connected, the database name, and the login credentials are dynamically determined according to the actual needs and conditions, and then the connection with the database is established in real time.

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

[0083] Specifically, according to 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 by the electromagnetic parameter distribution cloud map, and the vibration displacement and vibration acceleration are analyzed by the vibration parameter distribution cloud map, so as to provide technical guidance for the optimization of defect detection technology and the analysis of abnormal vibration phenomena.

[0084] The technical solution provided by the embodiment of the present invention calculates the load matrix of the GIS high-voltage conductor connection mechanism in the electromagnetic field, and inputs the load matrix calculated in the electromagnetic field into the mechanical field as the mechanical field load excitation. Based on the elastic dynamics equation in the mechanical field, an "electromagnetic-mechanical" coupling relationship can be established, and then a simulation model of the "electromagnetic excitation source-vibration displacement" of the GIS high-voltage conductor connection mechanism can be constructed. Then, the structural model of the GIS high-voltage conductor connection mechanism can be simulated according to the simulation model to determine the electromagnetic parameter distribution characteristics and the vibration parameter distribution characteristics. By analyzing the electromagnetic parameter distribution characteristics and the vibration parameter distribution characteristics, it is possible to predict the potential fault hazards of each structural unit of the GIS high-voltage conductor connection mechanism, and perform pre-maintenance on the structural units that may have potential fault hazards, providing technical guidance for the optimization of defect detection technology and the analysis of abnormal vibration phenomena.

[0085] Figure 2 A flowchart of another simulation method of a GIS high-voltage conductor connection mechanism provided by an embodiment of the present invention. The embodiment of the present invention further refines the above embodiment on the basis of the above embodiment. The GIS high-voltage conductor connection mechanism includes a plurality of structural units, and different structural units are connected; see Figure 2 , the simulation method includes:

[0086] S210, determining the external Schlorentz stress matrix of each structural unit node according to the volume current density, electric displacement, electric field intensity, magnetic induction intensity, unit volume and Maxwell stress tensor of each structural unit node under the electromagnetic excitation source.

[0087] Among them, the current density, electric displacement, electric field intensity, magnetic induction intensity, unit volume and Maxwell stress tensor are all calculated based on the electromagnetic principle according to the electromagnetic excitation source.

[0088] Specifically, the following formula is used to determine the external Schlorentz stress matrix of the structural unit node:

[0089] In the formula, f i exc is the external Schlorentz stress matrix of the structural unit node, D i is the electric displacement, E i is the electric field strength, Ji is the current density in the volume, B i is the magnetic induction intensity, T i is the Maxwell stress tensor, and dV is the volume inside the unit.

[0090] S220, iterating the external Schlorentz 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 iterative calculations, or can be set based on ensuring that the Lorentz stress matrix can gradually approach an accurate solution during the iteration process and converge within an acceptable error range. The iteration method here uses the Newton-Raphson iteration method to implement finite element iterative calculations.

[0092] S230, judging whether the iteration of the external Schlorentz stress matrix is ​​completed, if so, executing S240; if not, returning to executing S210.

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

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

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

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

[0097] Among them, the preset material parameters include material type, material density, Young's modulus of the material, and Poisson's ratio of the material. The preset material parameters can be set in advance. The deformation coordination relationship is generally understood as imagining that the deformed solid is divided into multiple parts, each of which can be deformed, and the deformation of each part can have many forms. If these deformed small blocks are combined in sequence, there will generally be many gaps and they cannot be combined into the original continuous solid. In order to make the combined shape the same as the original continuous solid, the deformation of each small block cannot be handled arbitrarily, and must meet certain conditions. The mathematical expression of this condition is called the deformation coordination relationship.

[0098] Specifically, the following formula is used to calculate the Lamé first constant, Lamé second constant and Green strain matrix:

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

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

[0101] In the formula, u Gi is the Green strain matrix of the structural unit, u Si is the deformation gradient matrix of the structural unit, is the transposed matrix of the deformation gradient matrix of the structural unit, and I is the preset current.

[0102] S260. Calculate the Caucthy stress matrix based on the constitutive relation of elastic mechanics according to Lamé's first constant, Lamé's second constant and Green's strain matrix.

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

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

[0105] S270. According to the Caucthy stress matrix and the load matrix, based on the elastic dynamics equation, the vibration displacement of the structural model in the mechanical field is calculated.

[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 dynamics equation can be converted into a unit equilibrium differential equation, and then the vibration displacement of the structural model in the mechanical field is calculated by the unit equilibrium differential equation.

[0107] Among them, the elastic dynamics equation should satisfy the following formula:

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

[0109] In the formula, ρ i is the material density of the structural unit, x i is the vibration displacement of the structural unit, g is the gravitational acceleration, d i is the damping coefficient of the structural unit.

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

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

[0112] S290, determine whether the vibration displacement iteration is completed, if so, execute S291; if not, return to execute S250.

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

[0114] The technical solution provided by the embodiment of the present invention implements finite element iterative calculation of the external Lorentz stress matrix of each structural unit node through the Newton-Raphson method, and determines the load matrix of the structural model based on the sum of the external Lorentz stress matrices of all structural unit structures. The load matrix is ​​used as a mechanical field excitation and combined with the elastic dynamics equation to determine the vibration displacement of the structural model, and then outputs the electromagnetic parameter distribution characteristics and the vibration parameter distribution characteristics, further providing technical guidance for the optimization of defect detection technology and the analysis of abnormal vibration phenomena.

[0115] Figure 3 This is a flow chart of another simulation method for a GIS high-voltage conductor connection mechanism provided by an embodiment of the present invention. The embodiment of the present invention further refines the above embodiment on the basis of the above embodiment. Figure 3 , the simulation method includes:

[0116] S310. Construct a structural model of the GIS high-voltage conductor connection mechanism according to the structural parameters of the GIS high-voltage conductor connection mechanism.

[0117] Among them, the structural parameters include structural size and shape; referring to the real equipment, according to the size and shape of the GIS high-voltage conductor connection mechanism, the structural model of the GIS high-voltage conductor connection mechanism is constructed in the three-dimensional mapping software.

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

[0119] Specifically, GIS includes busbars, disconnecting / earthing switches, circuit breakers, current / voltage transformers and other air chambers. The embodiments of the present invention mainly study "bolted" and "plug-in" type connection mechanisms, where the "bolted" type connection mechanism is represented by the busbar air chamber, and the main structures include: guide rods, contact springs, shielding covers, conductor bases, pot-type insulators, shells and brackets, etc.; the "plug-in" type connection mechanism is represented by disconnecting switches, and the main structures include: guide rods, plum blossom contacts, clamp springs, conductor bases, pot-type insulators and shells, etc. The conductor material is conductive metal copper, the shell material is non-magnetic cast steel, and the insulator material is epoxy resin. The shell, conductor base and pot-type insulator are fastened with bolts, and the plum blossom contacts and guide rods are pre-tightened and plugged in with clamp springs. In order to improve the convergence and efficiency of the vibration calculation model of the GIS high-voltage conductor connection mechanism, the following provisions are made: simplify the bolt connection structure of the pot insulator and the shell, and define the boundary annulus in the form of fixed and distributed stiffness; simplify the bolt connection structure of the conductor base of the pot insulator, and use the transverse spring and crimping load as equivalent to the fixing bolt; simplify the spring structure of the hoop spring of the plum blossom contact in the form of preload and radial stiffness, and the contact piece and the clamping ring of the hoop spring are equivalent to an annular integral structure; set the bottom surface of the bracket as a fixed boundary; retain the main parts such as the guide rod, plum blossom contact, conductor base, shell, pot insulator, etc.; all materials are linear elastic materials, and the influence of structural damping is ignored.

[0120] S330. Calculate the load matrix of the structural model based on the electromagnetic principle according to the structural model of the GIS high-voltage conductor connection mechanism and the electromagnetic excitation source.

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

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

[0123] S360. Analyze the difference characteristics of magnetic flux density, current density, vibration displacement and vibration acceleration at different positions based on the electromagnetic parameter distribution characteristics and the vibration parameter distribution characteristics.

[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, according to the distribution characteristics of electromagnetic parameters and vibration parameters, the difference characteristics of magnetic flux density, current density, vibration displacement and vibration acceleration at different positions are analyzed, thereby providing technical guidance for the optimization of defect detection technology and the analysis of abnormal vibration phenomena.

[0125] The simulation method of the GIS high-voltage conductor connection mechanism provided by the present invention is described in detail below in conjunction with a specific embodiment, and the effectiveness of the simulation method provided by the present invention is verified by taking the disconnector air chamber and the busbar air chamber as examples. Figure 4 A flowchart of a simulation method for a GIS high-voltage conductor connection mechanism provided by an embodiment of the present invention is shown in FIG. Figure 4 , the simulation method includes:

[0126] S410: Parameter setting.

[0127] S420: Apply boundary conditions.

[0128] S430, Lorentz force calculation.

[0129] Including calculation of current density J, magnetic flux density B, magnetic induction intensity H, Maxwell stress tensor T and Lorentz force matrix f i .

[0130] S440, determine whether the iteration of the Lorentz force calculation is completed, if not, return to execute S430; if yes, execute S450.

[0131] S450, output electromagnetic field calculation results.

[0132] S460, applying load to the mechanical field through the dynamic link database using the electromagnetic field output result.

[0133] S470, perform mechanical field calculation.

[0134] S480, determining whether the mechanical field calculation iteration is complete, if so, executing S490, if not, returning to executing S470.

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

[0136] Exemplarily, the embodiments of the present invention take the isolating switch air chamber and the busbar air chamber as examples for effectiveness verification: Figure 5 A front view of a busbar air chamber structure model of a "bolted" type connection mechanism provided in an embodiment of the present invention, Figure 6 This is an oblique view of the busbar air chamber structure model of the "bolted" type connection mechanism provided in an embodiment of the present invention, Figure 7A front view of the air chamber structure model of the isolating switch of the "plug-in" type connection mechanism provided by an embodiment of the present invention, Figure 8 The oblique view of the air chamber structure model of the isolating switch of the "plug-in" type connection mechanism provided by the embodiment of the present invention; see Figure 5 , Figure 6 , Figure 7 and Figure 8 , the initial acceleration value of the structure in each coordinate direction is stipulated to be zero, and the electromagnetic and vibration parameter simulation calculations of the two types of air chambers are carried out under frequency domain conditions. The material, geometry and operation parameters are set with reference to the real equipment, and the specific technical parameters of the model are shown in Table 1 below.

[0137] Table 1

[0138]

[0139] Fig. 9 The simulation calculation results of the magnetic flux density distribution characteristics of the busbar air chamber under 1500A current provided by the embodiment of the present invention are as follows: Fig.10 The simulation calculation results of the current density distribution characteristics of the busbar gas chamber under 1500A current provided by the embodiment of the present invention are as follows: Fig.11 The simulation calculation results of the magnetic flux density distribution characteristics of the air chamber connection mechanism of the isolating switch under 1500A current provided by the embodiment of the present invention are as follows: Fig.12 The simulation calculation results of the current density distribution characteristics of the disconnector air chamber connection mechanism under 1500A current provided for the embodiment of the present invention. As can be seen from the figure, the electromagnetic parameter distribution characteristics of the busbar and disconnector air chamber are strongly correlated with the location of the connection mechanism: the busbar conductor base, disconnector plum blossom contact fingers and guide rod area all have strong amplitude distribution, especially the current density amplitude at the confluence of the internal conductor structure is the largest, and the magnetic flux density at the contact part of the base and contact fingers is relatively high. The "conductor base-plum blossom contact fingers-guide rod" connection mechanism inside the disconnector air chamber forms a current conduction area, while the magnetic flux and current density on the grounding switch side are relatively small; the magnetic flux is mainly distributed on the surface of the current-carrying conductor inside the air chamber, and the amplitude is relatively small in the insulator and shell area.

[0140] Fig.13 The simulation calculation results of the vibration displacement distribution characteristics of the air chamber connection mechanism of the isolating switch under 1500A current provided by the embodiment of the present invention are as follows: Fig.14 A cross-sectional view of the simulation calculation results of the vibration displacement distribution characteristics of the air chamber connection mechanism of the disconnector under 1500A current provided by an embodiment of the present invention, Fig.15 The simulation calculation results of the vibration acceleration distribution characteristics of the air chamber connection mechanism of the isolating switch under 1500A current provided by the embodiment of the present invention are as follows: Fig.16 A cross-sectional diagram of the simulation calculation results of the vibration acceleration distribution characteristics of the air chamber connection mechanism of the disconnector under a current of 1500A provided in an embodiment of the present invention, Fig.17The simulation calculation results of the vibration displacement distribution characteristics of the busbar air chamber connection mechanism under 1500A current provided in the embodiment of the present invention; Fig.18 A cross-sectional diagram of simulation calculation results of vibration displacement distribution characteristics of a busbar air chamber connection mechanism under a current of 1500A provided in an embodiment of the present invention; Fig.19 The simulation calculation results of the vibration acceleration distribution characteristics of the busbar air chamber connection mechanism under 1500A current provided in the embodiment of the present invention; Fig. 20 The simulation calculation result of the vibration acceleration distribution characteristics of the busbar air chamber connection mechanism under 1500A current provided by the embodiment of the present invention is a cross-sectional diagram. It can be seen from the figure that the vibration displacement amplitude of the high-voltage conductor connection mechanism of the two air chambers is in the range of 10-7 to 10-5m (micrometer level), and the vibration acceleration amplitude is in the range of 10-3 to 10-1m / s2 (millimeter level), so the acceleration signal is more sensitive to vibration information detection; the amplitude of the internal conductor of the busbar and the disconnector is larger than the external shell amplitude as a whole, and shows a trend of gradual attenuation, which is related to the large Lorentz force generated by the flow of the internal conductor; the vibration amplitude of the connection part of the plum blossom contact and the guide rod of the disconnector air chamber is greater than the vibration amplitude of the internal conductor, because the constraint stiffness of the plum blossom contact is provided by the spring, which has good spatial recovery. In addition, the flow area of ​​the plum blossom contact and the guide rod is small, and the current contraction effect is more obvious; the busbar air chamber conductor is concentrated from the middle to the two ends, especially the amplitude at the end of the base is larger. It can be seen that the GIS vibration amplitude is strongly correlated with the structural form, especially at the contact part of the high-voltage conductor connection mechanism. The current collection and the contraction of the contact area will lead to the increase of the Lorentz magnetic force, driving the structure to produce a strong vibration response. On the other hand, the structural constraint stiffness, spatial freedom, and vibration propagation are also key factors affecting its vibration amplitude. For example, there is no current in the conductor on the grounding switch side, but it still distributes a relatively strong vibration amplitude.

[0141] Fig.21 A structural diagram of a simulation device for a GIS high-voltage conductor connection mechanism provided by an embodiment of the present invention, see Fig.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] The construction module 2120 is used to construct a simulation model of "electromagnetic excitation source-vibration displacement" of the GIS high-voltage conductor connection mechanism according to the load matrix based on the elastic dynamics equation.

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

[0145] The simulation device for the GIS high-voltage conductor connection mechanism provided in the embodiment of the present invention can execute the simulation method for the GIS high-voltage conductor connection mechanism provided in any embodiment of the present 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 to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0147] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A simulation method for a GIS high-voltage conductor connection mechanism, characterized in that: include: According to the structural model of the high-voltage conductor connection mechanism of the gas insulated switchgear (GIS) and the electromagnetic excitation source based on the electromagnetic principle, the load matrix of the structural model is calculated; According to the load matrix and based on the elastic dynamics equation, a simulation model of "electromagnetic excitation source-vibration displacement" of the GIS high-voltage conductor connection mechanism is constructed; The structural model of the GIS high-voltage conductor connection mechanism is simulated according to the simulation model to determine the electromagnetic parameter distribution characteristics and the vibration parameter distribution characteristics.

2. The simulation method according to claim 1, characterized in that: The GIS high-voltage conductor connection mechanism includes a plurality of structural units, and different structural units are connected to each other; the load matrix of the structural model is calculated based on the electromagnetic principle according to the pre-constructed structural model of the high-voltage conductor connection mechanism of the gas insulated switchgear (GIS) and the electromagnetic excitation source, including: Determine the external Schlorentz stress matrix of each structural unit node according to the volume current density, electric displacement, electric field intensity, magnetic induction intensity, unit internal volume and Maxwell stress tensor of each structural unit node under the electromagnetic excitation source; The load matrix of the structural model is determined according to the sum of the externally applied Lorentz stress matrices of all the structural unit nodes.

3. The simulation method according to claim 1, characterized in that: When the GIS high-voltage conductor connection mechanism is a linear elastic material, the construction of the simulation model of "electromagnetic excitation source-vibration displacement" of the GIS high-voltage conductor connection mechanism based on the load matrix and the elastic dynamics equation includes: According to the preset material parameters and based on the deformation coordination relationship, the Lamé first constant, Lamé second constant and Green strain matrix are calculated; Calculate the Caucthy stress matrix based on the constitutive relationship of elastic mechanics according to the first Lamé constant, the second Lamé constant and the Green strain matrix; According to the Caucthy stress matrix and the load matrix, based on the elastic dynamics equation, the vibration displacement of the structural model in the mechanical field is calculated.

4. The simulation method according to any one of claims 2 and 3, characterized in that: After determining the external Schlorentz stress matrix of the structural unit node according to the volumetric current density, electric displacement, electric field intensity, magnetic induction intensity, unit volume, gradient operator and Maxwell stress tensor of each structural unit node, the method further includes: Iterating the external Schlorentz stress matrix of the structural unit node according to a first preset iteration condition; Determine whether the iteration of the external Schlorentz stress matrix is ​​completed, and if not, return to the step of determining the external Schlorentz stress matrix of the structural unit node; After calculating the vibration displacement of the structural model in the mechanical field based on the elastic dynamics equation according to the Caucthy stress matrix and the load matrix, the method further includes: Iterating the vibration displacement of the structural model in the mechanical field according to a second preset iteration condition; It is determined whether the vibration displacement iteration is completed. If not, the process returns to the step of calculating the Lamé first constant, the Lamé second constant and the Green strain matrix.

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

6. The simulation method according to claim 1, characterized in that: Before calculating 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, the method further includes: According to 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 imposed on the structural model.

7. The simulation method according to claim 6, characterized in that: The GIS high-voltage conductor connection mechanism includes a pot-type insulator, a conductor base, a shell and a bracket; the boundary conditions applied to the structural model include: Simplifying the bolt connection structure between the pot insulator and the housing, and defining the boundary annulus in the form of fixed and distributed stiffness; Simplify the bolt connection structure of the conductor base of the pot-type insulator, and fix the bolts in the form of transverse springs and crimping loads; The lower bottom surface of the bracket is set as a fixed boundary.

8. The simulation method according to claim 7, characterized in that: The GIS high-voltage conductor connection mechanism includes an isolating switch air chamber, and the isolating switch air chamber includes a plum blossom contact. The applying boundary conditions to the structural model also includes: The spring structure of the hoop spring of the plum blossom contact is simplified in the form of preload force and radial stiffness, and the contact piece and the clamping ring of the hoop spring are equivalent to an annular integral structure.

9. The simulation method according to claim 2, characterized in that: Determining the external Schlorentz stress matrix of the structural unit node according to the volumetric current density, electric displacement, electric field intensity, magnetic induction intensity, unit volume, gradient operator and Maxwell stress tensor of each structural unit node includes: The external Schlorentz stress matrix of the structural unit node is determined using the following formula: In the formula, f i exc is the external Schlorentz stress matrix of the structural unit node, D i is the electric displacement, E i is the electric field strength, J i is the current density in the volume, B i is the magnetic induction intensity, T i is the Maxwell stress tensor, dV is the volume inside the unit; Determining the load matrix of the structural model according to the sum of the externally applied Lorentz stress matrices of all the structural unit nodes includes: The load matrix of the structural model is determined using the following formula: Where N exc is the number of structural unit nodes, F exc (t) is the load matrix.

10. The simulation method according to claim 3, characterized in that: The preset material parameters include Young's modulus and Poisson's ratio of the GIS high-voltage conductor connection mechanism material; According to the preset material parameters and the deformation coordination relationship, the Lamé first constant, Lamé second constant and Green strain matrix are calculated, including: The following formulas are used to calculate the Lamé first constant, Lamé second constant and Green strain matrix: In the formula, λ S is Lamé's first constant, E S is the Young's modulus of the GIS high-voltage conductor connection material, α S Poisson's ratio of the material of the GIS high-voltage conductor connection mechanism; In the formula, μ S is Lamé's second constant; In the formula, u Gi is the Green strain matrix of the structural unit, u Si is the deformation gradient matrix of the structural unit, is the transposed matrix of the deformation gradient matrix of the structural unit, and I is the unit matrix; According to the first Lamé constant, the second Lamé constant and the Green strain matrix, based on the elastic mechanics constitutive relationship, calculating the Caucthy stress matrix includes: The Caucthy stress matrix is ​​calculated using the following formula: In the formula, σ Ci is the Caucthy stress matrix of the structural unit, u S0i is the determinant of the deformation gradient matrix of the structural unit, tr(u Gi ) is the trace of the Green strain matrix of the structural unit; According to the Caucthy stress matrix and the load matrix, based on the elastic dynamics equation, calculating the vibration displacement of the structural model in the mechanical field includes: The vibration displacement of the structural model in the mechanical field is calculated using the following formula: In the formula, ρ i is the material density of the structural unit, x i is the vibration displacement of the structural unit, g is the gravitational acceleration, d i is the damping coefficient of the structural unit.

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