Dynamic simulation method for breaking process of molded case circuit breaker based on heterogeneous simulation system

Abstract

The application discloses a dynamic simulation method for breaking process of a molded case circuit breaker based on a heterogeneous simulation system, and relates to the technical field of low-voltage electrical appliance design and simulation. The application constructs a high-efficiency heterogeneous simulation system which is accurately dispatched by a cooperative simulation control module, and the loop current calculated by a first simulation subsystem is transmitted to a second simulation subsystem in real time, which is used to calculate the electromagnetic force driving the mechanism to move, and the contact displacement generated by the mechanism movement is fed back to the first subsystem immediately, which is used to dynamically update the resistance characteristic of the arc model, thereby affecting the calculation of the arc voltage, and the arc voltage is directly fed back to the circuit model, which determines the current value at the next moment, forming a complete dynamic interaction simulation chain from the circuit current, the electromagnetic force, the mechanical displacement, the arc resistance, the arc voltage and the circuit current, so that the simulation model can self-consistently reflect the dynamic evolution process of each physical quantity in the real breaking process.

Description

TECHNICAL FIELD

[0001] The application relates to the field of low-voltage electrical appliance design and simulation, in particular to a dynamic simulation method for the breaking process of a molded case circuit breaker based on a heterogeneous simulation system. BACKGROUND

[0002] As a key protection electrical appliance in a low-voltage distribution network, the breaking performance of a molded case circuit breaker is directly related to the safe and stable operation of the entire power system. The breaking process of the circuit breaker is an extremely complex transient physical process, which involves the strong nonlinear coupling between multiple physical fields such as circuit system, electromagnetic field, mechanical movement, arc plasma, and fluid field and thermal field in the arc chamber. Accurate simulation of the dynamic process of the "electric-magnetic-mechanical-thermal-flow" multi-field coupling is of great significance for in-depth understanding of the breaking mechanism, prediction of the breaking performance, and optimization of product design. Traditional single simulation tools, whether circuit simulation software or structural dynamics analysis software, are difficult to simulate the complex interaction process with high fidelity due to their inherent limitations.

[0003] At present, the research simulation method for the breaking process of the molded case circuit breaker has significant deficiencies. Most researches adopt an isolated simulation strategy, that is, only the electrical characteristics of the arc are simulated using circuit simulation software, or only the movement process of the mechanism is analyzed using multi-body dynamics software. This method artificially breaks the inherent internal relationship between the physical fields: the movement speed of the mechanism directly affects the stretching speed and length of the arc, thereby changing its resistance characteristics and arc voltage; the arc voltage in turn reacts on the circuit, determining the trend of the short-circuit current; at the same time, the intense aerodynamic effect caused by the arc burning will form a counterforce on the contact movement. The isolated simulation cannot realize the real-time bidirectional transmission and feedback of these key parameters, resulting in a large deviation between the simulation results and the physical reality, and thus cannot accurately simulate the dynamic influence of the aerodynamic force on the breaking process, limiting the prediction accuracy and reliability of the simulation model.

[0004] Therefore, there is an urgent need in the art for a collaborative simulation method that can realize real-time, bidirectional, and dynamic interaction of key parameters, in order to break through the limitations of the prior art and provide a virtual simulation platform for truly reflecting the multi-physical field coupling in the entire breaking process of the molded case circuit breaker. SUMMARY

[0005] The application aims at solving the problems in the prior art and provides a dynamic simulation method for breaking process of molded case circuit breaker based on a heterogeneous simulation system.

[0006] The application aims at solving the problems in the prior art and provides a dynamic simulation method for breaking process of molded case circuit breaker based on a heterogeneous simulation system.

[0007] S100, constructing a heterogeneous simulation system connected by a first simulation subsystem and a second simulation subsystem through a cooperative simulation control module;

[0008] S200, model establishment and initialization: establishing a circuit simulation model containing a power supply, a load, a short-circuit fault module and a circuit breaker arc model in the first simulation subsystem, and establishing a multi-body dynamics model containing a contact system, an operating mechanism, a lock and a spring in the second simulation subsystem; setting consistent initial conditions including voltage, current, initial position of the contact, and mechanism state;

[0009] S300, cooperative simulation execution and dynamic data exchange: starting the cooperative simulation control module, making the first simulation subsystem and the second simulation subsystem parallel computing and keeping a synchronous clock, and executing data interaction and calculation in each simulation step;

[0010] S400, simulation result output and analysis: repeating S300 until the simulation ends, outputting and analyzing the contact motion characteristic curve, the current and voltage waveform, the arc energy and the breaking time parameter.

[0011] Further, in S100, the first simulation subsystem adopts a circuit simulation method for simulating circuit characteristics and arc electrical characteristics, and performs electromagnetic transient simulation.

[0012] The second simulation subsystem employs multibody dynamics and finite element analysis methods to simulate the multibody dynamics characteristics and contact motion of the operating mechanism, and performs multibody dynamics and finite element analysis simulations.

[0013] The collaborative simulation control module is connected between the first simulation subsystem and the second simulation subsystem, configured to manage simulation clock synchronization, and used for bidirectional data exchange between the first simulation subsystem and the second simulation subsystem.

[0014] Furthermore, in S300, the specific steps for performing data interaction and calculation are as follows:

[0015] S301, The first simulation subsystem calculates the loop current value at the current moment. and arc voltage value based on arc model ;

[0016] S302, the arc voltage value The circuit simulation model of the first simulation subsystem is transmitted and fed back in real time through the collaborative simulation control module, which serves as the voltage drop of the arc branch and dynamically affects the calculation of the loop current in the next simulation step.

[0017] S303, The circuit current value The data is transmitted in real time to the second simulation subsystem via the collaborative simulation control module.

[0018] S304, the second simulation subsystem, based on the received loop current value... Calculate the electromagnetic force acting on the moving contact and mechanism and the electromagnetic force The load is applied to the multibody dynamics model to calculate the displacement of the contact. ,speed Acceleration motion parameters;

[0019] S305, The calculated contact displacement value The arc model of the first simulation subsystem is transmitted in real time through the collaborative simulation control module to update the arc length and its resistance / conductivity characteristics, thereby affecting the calculation of the arc voltage in the next step.

[0020] Furthermore, in S304, the electromagnetic force The calculation is performed in the following way:

[0021] A static magnetic field model of the circuit breaker was established in advance using the finite element method, and simulations were conducted to obtain different current values ​​at different moving contact positions D. Corresponding electromagnetic force acting on the moving contact Two-dimensional mapping relationship table ;

[0022] During the collaborative simulation process, the second simulation subsystem calculates the received real-time current value. and current contact displacement value By querying the two-dimensional mapping table Interpolation is then performed to obtain the electromagnetic force at the current moment. .

[0023] Furthermore, in S305, the contact displacement value Resistance values ​​used for dynamically updating the arc model Its update relationship is: ,in, The initial contact resistance. The correlation coefficient is related to the properties of the arc plasma medium and the diameter of the arc column.

[0024] Furthermore, S300 also includes:

[0025] S306, The second simulation subsystem calculates the contact movement speed. Transmitted to the first simulation subsystem;

[0026] S307, the arc model of the first simulation subsystem is based on the speed Calculate the aerodynamic pressure generated by the electric arc and the pneumatic pressure The feedback is sent to the second simulation subsystem and applied as an additional load to the moving contact to simulate the reaction of aerodynamic force on the mechanism's motion.

[0027] Furthermore, in S307, the pneumatic pressure The calculation is performed in the following way:

[0028] Based on the contact movement speed And the current arc morphology, through Calculations are performed, in which, The density of the medium inside the arc extinguishing chamber, This is the aerodynamic drag coefficient.

[0029] Furthermore, the pneumatic pressure The load is applied in the following manner:

[0030] The second simulation subsystem will receive Value multiplied by an equivalent area of ​​action Converted into force: This force is then applied as a pair of loads in opposite directions to the end of the moving contact and the corresponding reference point on the arc-extinguishing chamber wall, respectively, to simulate the hindering effect of arc pneumatic pressure on the movement of the contact.

[0031] Compared with existing technologies, this dynamic simulation method for the breaking process of molded case circuit breakers based on heterogeneous simulation systems has the following advantages:

[0032] This invention constructs a highly efficient heterogeneous simulation system precisely scheduled by a collaborative simulation control module. The loop current calculated by the first simulation subsystem is transmitted in real-time to the second simulation subsystem to calculate the electromagnetic force driving the mechanism. The contact displacement generated by the mechanism's movement is immediately fed back to the first subsystem to dynamically update the resistance characteristics of the arc model, thus affecting the calculation of the arc voltage. This arc voltage is then directly fed back to the circuit model, determining the current value at the next moment. This forms a complete, dynamically interactive simulation chain encompassing circuit current, electromagnetic force, mechanical displacement, arc resistance, arc voltage, and circuit current. This mechanism fundamentally overcomes the shortcomings of isolated simulation, ensuring that the interactions between the four key physical fields—electricity, magnetism, mechanics, and arc—are accurately and in real-time depicted. This allows the simulation model to self-consistently reflect the dynamic evolution of each physical quantity during the actual breaking process, greatly improving the realism and accuracy of the simulation.

[0033] Other advantages, objectives and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from the practice of the invention. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0035] Figure 1 The flowchart shows the operation of a dynamic simulation method for the breaking process of a molded case circuit breaker based on a heterogeneous simulation system.

[0036] Figure 2 This is a flowchart illustrating the steps of a dynamic simulation method for the breaking process of a molded case circuit breaker based on a heterogeneous simulation system. Detailed Implementation

[0037] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0038] Example 1

[0039] This embodiment provides the working principle of a dynamic simulation method for the breaking process of a molded case circuit breaker based on a heterogeneous simulation system. By constructing a heterogeneous architecture including a first simulation subsystem, a second simulation subsystem, and a collaborative simulation control module, the functional positioning and technical principles of each module are clarified. The model is established step by step, parameter initialization, collaborative simulation data interaction, and result analysis are completed. Electromagnetic force mapping query, dynamic update of arc resistance, aerodynamic pressure calculation and load application are integrated into the process to establish quantitative relationships between key parameters. Real-time coupled simulation of multiple physical fields of electro-magnetism-mechanics-arc is achieved during the breaking process, providing a specific implementation plan for simulating the breaking performance of molded case circuit breakers.

[0040] (I) Heterogeneous simulation system construction phase (S100)

[0041] A heterogeneous system architecture adapted for multi-physics coupled simulation of the breaking process of molded case circuit breakers was constructed to solve the problem that a single simulation tool cannot simultaneously simulate electrical characteristics and mechanical motion. This architecture consists of three parts: a first simulation subsystem, a second simulation subsystem, and a collaborative simulation control module. The functions and technical principles of each module are designed as follows:

[0042] The first simulation subsystem is designed to simulate circuit characteristics and arc electrical characteristics, and to perform electromagnetic transient simulation. The essence of the circuit breaker breaking process is the transient change of the circuit from conduction to disconnection, which involves electrical phenomena such as fault current generation, arc ignition and extinguishing. Circuit simulation methods are required to capture these transient processes. The circuit simulation method establishes a circuit topology model, solves the time-domain changes of voltage and current based on Kirchhoff's laws, and introduces an arc model to describe the nonlinear electrical characteristics of the contact gap, thereby realizing the dynamic calculation of key electrical parameters such as circuit current and arc voltage.

[0043] The second simulation subsystem is designed to simulate the multibody dynamics and contact motion of the operating mechanism, performing multibody dynamics and finite element analysis simulations. The operating mechanism is the core component driving the contact motion, and its motion involves the interaction of multiple rigid bodies such as linkages, latches, and springs. It is necessary to establish the kinematic and dynamic models of each component using multibody dynamics methods, and analyze the relationship between force, displacement, velocity, and acceleration. At the same time, electromagnetic force, as a key load affecting the mechanism's motion, requires the calculation of electromagnetic force by discretizing the magnetic field region into finite elements using finite element analysis methods, solving Maxwell's equations to obtain the magnetic field distribution, and then calculating the electromagnetic force on the current in the magnetic field, providing accurate load input for subsequent mechanism motion simulation.

[0044] The collaborative simulation control module, serving as the core hub connecting the two subsystems, revolves around clock synchronization and bidirectional data exchange. During the switching process, the changes in electrical and mechanical parameters are time-dependent. If the clocks of the two subsystems are not synchronized, it will lead to a time difference in data interaction, resulting in distortion of the simulation results. Therefore, the module needs to be configured with a clock synchronization unit to ensure that the two subsystems can perform parallel calculations under the same time base through a preset synchronization strategy. The bidirectional data exchange is realized based on the data interaction interface, which transmits the electrical parameters (such as loop current) output by the first subsystem to the second subsystem in real time, and simultaneously feeds back the mechanical parameters (such as contact displacement) output by the second subsystem to the first subsystem in real time, forming the transmission of "electrical-mechanical" parameters and providing data interaction support for multiphysics coupling simulation.

[0045] The collaborative simulation control module establishes a communication connection with the two subsystems through a data interaction interface. The clock synchronization unit sends clock synchronization signals to the two subsystems to ensure that the start and end times of the calculations within each simulation step are consistent. The data interaction unit transmits key parameters between the two subsystems according to a preset transmission frequency, thereby realizing a collaborative operation mechanism of "electrical simulation - mechanical simulation - data feedback - parameter update", laying the architectural foundation for the simulation execution in subsequent stages.

[0046] (II) Model Establishment and Initialization Phase (S200)

[0047] Refined models were established in both subsystems, and consistent initial conditions were set to ensure that the simulation starting point matched the actual switching conditions. The specific implementation process and technical principles are as follows:

[0048] First Simulation Subsystem: Circuit Simulation Model Establishment

[0049] The circuit simulation model comprises four core components: power supply, load, short-circuit fault module, and circuit breaker arc model. The power supply module provides the energy basis for the generation of fault current. The load module simulates the current state during normal circuit operation by setting parameters such as the resistance and inductance of the load, providing a benchmark for current changes when a short-circuit fault occurs. The short-circuit fault module simulates the transient process of a sudden low-impedance path appearing in the circuit by setting the fault trigger time and fault type. When the fault is triggered, the module reduces the impedance of the fault branch in the circuit to an extremely low value. According to Ohm's law, the loop current will rapidly rise to the short-circuit current level, thereby triggering the operating mechanism to act. The circuit breaker arc model dynamically updates the arc length through contact displacement, thereby adjusting the arc resistance / conductance characteristics.

[0050] Second simulation subsystem: Establishment of multibody dynamics model

[0051] The multibody dynamics model comprises four core components: the contact system, the operating mechanism, the latch, and the spring. The contact system is the key component for current conduction and interruption, consisting of a moving contact and a stationary contact, laying the foundation for subsequent calculations of the moving contact's displacement and velocity. The operating mechanism is the transmission component that drives the moving contact's movement, composed of rigid bodies such as connecting rods and rotating shafts. It simulates the relative motion relationships between components during actual operation, thereby driving the moving contact to achieve separation. The latch keeps the moving and stationary contacts closed during normal operation of the circuit breaker. In the event of a fault, it releases the mechanism to trigger contact separation. The spring is the power source of the operating mechanism, consisting of a tripping spring and a closing spring. Under normal conditions, the tripping spring is in a pre-compressed state, storing elastic potential energy. After the latch is released, the spring's elastic potential energy is converted into the mechanism's kinetic energy, driving the moving contact to separate rapidly.

[0052] The initial conditions must be set to ensure that the simulation starting points of the two subsystems are consistent to avoid simulation deviations caused by differences in initial states. The initial voltage is set to the rated output voltage of the power module to ensure that the initial state of the circuit matches the normal operating conditions. The initial current is set to the load current when the circuit is operating normally. The initial position of the contacts is set to the position in the "closed state", that is, the moving contact is in contact with the stationary contact. At this time, the contact gap is 0. The movement process of the contacts from closing to separating in the subsequent simulation can directly correspond to the contact action in the actual breaking process, providing a basis for the initial value of the arc length in the arc model (initially 0). The initial state of the mechanism is set to the "locked and spring pre-compressed" state. The lock ensures that the mechanism does not move, and the spring pre-compressed stores enough power to provide energy for rapid tripping when a fault is triggered.

[0053] (III) Collaborative Simulation Execution and Dynamic Data Exchange Phase (S300)

[0054] Under the scheduling of the collaborative simulation control module, parallel computing and real-time data interaction between the two subsystems are realized, capturing the dynamic coupling relationship of "electromagnetism-mechanics-arc" during the switching process. The data interaction and calculation process within each simulation step strictly follows the preset logic. The technical principles and operation process of the specific steps are as follows:

[0055] Electrical parameter calculation (S301): The first simulation subsystem calculates the loop current value at the current moment. and arc voltage value based on arc model .

[0056] Arc voltage is fed back to the circuit model (S302): The calculated arc voltage value is fed back to the circuit model. The circuit simulation model of the first simulation subsystem is fed back in real time by the collaborative simulation control module as the voltage drop of the arc branch.

[0057] The loop current is transferred to the second subsystem (S303): the loop current value is transferred through the co-simulation control module. Transferred to the second simulation subsystem in real time,

[0058] Electromagnetic force calculation and mechanism motion parameter solution (S304): According to the received loop current value Calculate the electromagnetic force , and load it as a load into the multi-body dynamics model to solve the displacement of the contact , velocity , acceleration motion parameters. Among them, for the electromagnetic force Adopt the method of "pre-establishing a mapping relationship table + real-time interpolation". Before simulation, establish a static magnetic field model of the circuit breaker through finite element software, set different current values, solve the magnetic field distribution corresponding to each current value, and then calculate the electromagnetic force acting on the moving contact ; Organize all "current value - electromagnetic force" data into a mapping relationship table and store it in the database of the second subsystem. During the co-simulation process, the second subsystem receives the real-time current value After that, instead of re-performing finite element analysis, by querying the mapping relationship table, the interpolation method is used to obtain the current Corresponding electromagnetic force , if Is between two adjacent current values I1 and I2 in the mapping relationship table (I1 < < I2), the corresponding electromagnetic forces are And , then (t) = + ([[]] - I1) × ([[]] - ) / (I2 - I1). This method not only ensures the accuracy of electromagnetic force calculation but also greatly improves the calculation efficiency, meeting the requirements of real-time co-simulation.

[0059] Contact displacement feedback to the arc model (S305): Transmit the calculated contact displacement value To the arc model of the first simulation subsystem in real time through the co-simulation control module, for updating the arc length and its resistance / conductance characteristics. The contact displacement Is directly equal to the change in arc length - initially the contacts are closed and the arc length is 0; when the contacts separate, the moving contact moves a distance , the contact gap increases, and the arc length becomes (ignoring microscopic effects such as arc contraction), so after the first simulation subsystem receives , directly update the arc length parameter in the arc model to , providing a basis for subsequent arc resistance calculation. The update of arc resistance is based on the quantitative formula , where, The initial contact resistance is the resistance when the contacts are closed. To establish a correlation coefficient between the arc plasma dielectric properties and the arc column diameter, reflecting the conductivity characteristics during contact, the first simulation subsystem will update the arc resistance. Substitute the values ​​into the arc model to calculate the arc voltage for the next simulation step. This enables dynamic adjustment of the arc voltage as the contact displacement changes.

[0060] Contact velocity is transmitted to the first subsystem (S306): The second simulation subsystem transmits the calculated contact motion velocity V(t) to the first simulation subsystem. The first subsystem acquires V(t), calculates the aerodynamic pressure, and feeds it back to the second subsystem, thus realizing the coupling of "mechanical motion-aerodynamic effect-mechanical motion".

[0061] Aerodynamic pressure calculation and feedback (S307): The arc model of the first simulation subsystem calculates the aerodynamic pressure P(t) based on V(t) and feeds it back to the second subsystem as an additional load. The aerodynamic pressure is calculated using the formula... ,in, The density of the medium inside the arc extinguishing chamber, The aerodynamic drag coefficient is P(t). After receiving P(t), the second subsystem needs to convert it into a force. And applied to the multibody dynamics model, therefore it is necessary to... Multiply by the equivalent area of ​​action Gain concentration ,in, The equivalent area of ​​the moving contact in contact with the medium is denoted as . As a pair of loads in opposite directions, they are applied to the end of the moving contact and the corresponding reference point on the arc-extinguishing chamber wall, respectively. The reason for this application is that, according to Newton's third law, the moving contact is subjected to the pressure of the medium. (The direction is opposite to the direction of motion), and at the same time, the medium will generate a reaction force on the arc-extinguishing chamber wall. (The direction is the same as the direction of motion). This method ensures the force balance of the multibody dynamics model and avoids instability in the model calculation due to unilateral force application. Subsequently, when the second subsystem solves for the mechanism motion parameters in the next simulation step, it will incorporate this force into the dynamic equation, making the simulation results closer to the actual working condition where the contact motion is hindered by aerodynamics during the actual breaking process.

[0062] (iv) Simulation Result Output and Analysis Stage (S400)

[0063] By repeating the co-simulation process of the S300 stage until the simulation ends (i.e., the arc is extinguished, the criterion being that the loop current drops to 0 and remains there for a period of time), the key simulation results are then output and analyzed to verify the effectiveness of the simulation model. The specific implementation process and technical principles are as follows:

[0064] Simulation completion logic: Arc extinction marks the completion of the breaking process. This judgment is based on the correlation between electrical parameters and physical phenomena. When the arc extinguishes, the insulation strength of the contact gap recovers, and current can no longer be conducted; therefore, the loop current I(t) drops to 0. Simultaneously, the arc voltage... The current will drop to 0 as it disappears, ensuring that the arc is indeed extinguished, which meets the judgment criteria for the actual interruption process.

[0065] Simulation results output: Output and analyze contact motion characteristic curves, current and voltage waveforms, arc energy, and breaking time parameters. For the contact motion characteristic curves: include displacement-time curves (D(t)-t) and velocity-time curves (V(t)-t), reflecting the motion process of the contacts from closing to separating; for the current and voltage waveforms: include loop current waveforms (I(t)-t) and arc voltage waveforms (…). The current waveform is used to reflect the generation, change, and extinction process of the short-circuit current. For arc energy, it reflects the energy released during arc combustion. Excessive energy may lead to arc chamber burnout, contact welding, and other faults, thus serving as an indicator for evaluating the circuit breaker's breaking performance. For breaking time, it refers to the total time from the occurrence of a short-circuit fault to the extinction of the arc, including the opening time from the fault occurrence to the start of contact separation and the arc burning time from the start of contact separation to the extinction of the arc. Breaking time reflects the protection speed of the circuit breaker; the shorter the time, the better the protection effect on the power distribution system, preventing equipment damage due to prolonged exposure to short-circuit current. Through result output and analysis, the effectiveness of the entire heterogeneous simulation system is verified, providing data support for subsequent circuit breaker design optimization.

[0066] In summary, this embodiment achieves dynamic simulation of the breaking process of a molded case circuit breaker based on a heterogeneous simulation system through complete steps. By combining the first simulation subsystem (electrical simulation), the second simulation subsystem (mechanical simulation), and the collaborative simulation control module (clock synchronization and data interaction), it solves the problem that a single simulation tool cannot take into account the coupling of multiple physics fields. The collaborative simulation control module enables data interaction with existing subsystems, further improving the simulation capability of multi-physics field coupling.

[0067] Example 2

[0068] Based on Example 1, this example elaborates on the operation process of the dynamic simulation method for the breaking process of a molded case circuit breaker based on a heterogeneous simulation system, such as...Figure 1 As shown, the specific process is as follows:

[0069] (1) Constructing a heterogeneous simulation system

[0070] Build a simulation platform consisting of two subsystems:

[0071] First subsystem: Used for electrical simulation of circuits and arcs.

[0072] The second subsystem is used for multibody dynamics and mechanism motion simulation.

[0073] The two subsystems are connected by a co-simulation control module to ensure clock synchronization and data exchange.

[0074] (2) Establish simulation model and initialize

[0075] A circuit model is established in the first subsystem, including power supply, load, short-circuit module, and circuit breaker arc model.

[0076] A multibody dynamics model is established in the second subsystem, including contacts, operating mechanisms, latches, springs, etc.

[0077] Set uniform initial conditions: voltage, current, initial contact position, mechanism state, etc.

[0078] (3) Start the collaborative simulation control module

[0079] The simulation is started, and the two subsystems begin parallel computation.

[0080] The collaborative control module ensures that the clocks of both are synchronized.

[0081] (4) Calculate electrical quantities for the first subsystem

[0082] Calculate the loop current and arc voltage at the current moment.

[0083] (5) Transferring arc voltage to the circuit model

[0084] The arc voltage is fed back into the circuit model of the first subsystem, affecting the current calculation at the next moment.

[0085] (6) Transfer the current value to the second subsystem

[0086] The current current value is sent to the second subsystem via the collaborative control module.

[0087] (7) The second subsystem calculates the electromagnetic force

[0088] Based on the received current value, a predefined current-electromagnetic force mapping table is consulted to obtain the current electromagnetic force.

[0089] (8) Apply electromagnetic force to the dynamic model

[0090] Electromagnetic force is applied as an external load to the multibody dynamics model.

[0091] (9) Calculate the contact motion parameters

[0092] Solve the dynamic equations to obtain the motion state of the contact, such as displacement, velocity, and acceleration.

[0093] (10) Transfer contact displacement to the first subsystem

[0094] The contact displacement value is sent back to the arc model of the first subsystem.

[0095] (11) Update the arc resistance characteristics

[0096] The arc resistance is dynamically adjusted according to the contact displacement, which affects the arc voltage at the next moment.

[0097] Repeat the above data exchange and calculation process within each simulation step until the simulation ends.

[0098] (12) Output simulation results

[0099] Output parameters such as contact motion curve, current and voltage waveforms, arc energy, and breaking time.

[0100] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A dynamic simulation method for the breaking process of a molded case circuit breaker based on a heterogeneous simulation system, characterized in that, The specific steps of this method are as follows: S100, Construction of Heterogeneous Simulation System: Construct a heterogeneous simulation system consisting of a first simulation subsystem and a second simulation subsystem connected by a collaborative simulation control module; S200. Model Establishment and Initialization: In the first simulation subsystem, establish a circuit simulation model including power supply, load, short-circuit fault module and circuit breaker arc model; in the second simulation subsystem, establish a multibody dynamics model including contact system, operating mechanism, latch and spring; set consistent initial conditions, including voltage, current, initial contact position and mechanism state. S300, Cooperative Simulation Execution and Dynamic Data Exchange: The cooperative simulation control module is started, enabling the first simulation subsystem and the second simulation subsystem to perform parallel calculations and maintain a synchronized clock, and to perform data interaction and calculation within each simulation step; In step S300, the specific steps for performing data interaction and calculation are as follows: S301, The first simulation subsystem calculates the loop current value at the current moment. and arc voltage value based on arc model ; S302, the arc voltage value The circuit simulation model of the first simulation subsystem is transmitted and fed back in real time through the collaborative simulation control module, which serves as the voltage drop of the arc branch and dynamically affects the calculation of the loop current in the next simulation step. S303, The circuit current value The data is transmitted in real time to the second simulation subsystem via the collaborative simulation control module. S304, the second simulation subsystem, based on the received loop current value... Calculate the electromagnetic force acting on the moving contact and mechanism and the electromagnetic force The load is applied to the multibody dynamics model to calculate the displacement of the contact. ,speed Acceleration motion parameters; S305, calculate the displacement of the contact. The arc model of the first simulation subsystem is transmitted in real time through the collaborative simulation control module to update the arc length and its resistance / conductivity characteristics, thereby affecting the calculation of the arc voltage in the next step. S400 Simulation Result Output and Analysis: Repeat S300 until the simulation ends, output and analyze the contact motion characteristic curve, current and voltage waveforms, arc energy, and breaking time parameters.

2. The dynamic simulation method for the breaking process of a molded case circuit breaker based on a heterogeneous simulation system according to claim 1, characterized in that, In S100, the first simulation subsystem uses circuit simulation methods to simulate circuit characteristics and electric arc electrical characteristics, and performs electromagnetic transient simulation. The second simulation subsystem employs multibody dynamics and finite element analysis methods to simulate the multibody dynamics characteristics and contact motion of the operating mechanism, and performs multibody dynamics and finite element analysis simulations. The collaborative simulation control module is connected between the first simulation subsystem and the second simulation subsystem, configured to manage simulation clock synchronization, and used for bidirectional data exchange between the first simulation subsystem and the second simulation subsystem.

3. The dynamic simulation method for the breaking process of a molded case circuit breaker based on a heterogeneous simulation system according to claim 1, characterized in that, In S304, electromagnetic force The calculation is performed in the following way: A static magnetic field model of the circuit breaker was established in advance using the finite element method, and simulations were conducted to obtain different current values ​​at different moving contact positions D. Corresponding electromagnetic force acting on the moving contact Two-dimensional mapping relationship table ; During the collaborative simulation process, the second simulation subsystem calculates the received real-time current value. and current contact displacement value By querying the two-dimensional mapping table Interpolation is then performed to obtain the electromagnetic force at the current moment. .

4. The dynamic simulation method for the breaking process of a molded case circuit breaker based on a heterogeneous simulation system according to claim 1, characterized in that, In S305, the contact displacement value Resistance values ​​used for dynamically updating the arc model Its update relationship is: ,in, The initial contact resistance. The correlation coefficient is related to the properties of the arc plasma medium and the diameter of the arc column.

5. The dynamic simulation method for the breaking process of a molded case circuit breaker based on a heterogeneous simulation system according to claim 1, characterized in that, The S300 also includes: S306, The second simulation subsystem calculates the contact movement speed. Transmitted to the first simulation subsystem; S307, the arc model of the first simulation subsystem is based on the speed Calculate the aerodynamic pressure generated by the electric arc and the pneumatic pressure The feedback is sent to the second simulation subsystem and applied as an additional load to the moving contact to simulate the reaction of aerodynamic force on the mechanism's motion.

6. The dynamic simulation method for the breaking process of a molded case circuit breaker based on a heterogeneous simulation system according to claim 5, characterized in that, In S307, the pneumatic pressure The calculation is performed in the following way: Based on the contact movement speed And the current arc morphology, through Calculations are performed, in which, The density of the medium inside the arc extinguishing chamber, This is the aerodynamic drag coefficient.

7. The dynamic simulation method for the breaking process of a molded case circuit breaker based on a heterogeneous simulation system according to claim 6, characterized in that, The pneumatic pressure The load is applied in the following manner: The second simulation subsystem will receive Value multiplied by an equivalent area of ​​action Converted into force: This force is then applied as a pair of loads in opposite directions to the end of the moving contact and the corresponding reference point on the arc-extinguishing chamber wall, respectively, to simulate the hindering effect of arc pneumatic pressure on the movement of the contact.

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