Isolation switch dynamic arc simulation method considering contact action and related system thereof

Abstract

The invention discloses an isolating switch dynamic arc simulation method considering contact action and a related system thereof, and belongs to the technical field of high-voltage electrical equipment simulation. Firstly, a three-dimensional geometric model of the disconnecting switch is constructed according to actual size parameters, then the three-dimensional geometric model is imported into simulation software, movement of a movable arc striking contact is simulated, and a medium strength recovery curve is obtained. And then constructing an electromagnetic simulation circuit considering arc reignition, simulating a dynamic arcing process, and obtaining a voltage difference and a current at two ends of the isolation switch. The arc extinguishing or arcing state is judged by combining the voltage difference, the current and the medium strength recovery curve, and the electromagnetic simulation circuit is controlled according to the arc extinguishing or arcing state, so that closed-loop simulation of the arcing-arc extinguishing alternating state of the disconnecting switch is realized. According to the method, the contact motion characteristics and the arc physical process are innovatively coupled, the problem of simulation errors caused by the adoption of a simplified medium strength curve in a traditional method is solved, the isolation switch operation transient overvoltage characteristics can be accurately predicted, and a reliable analysis means is provided for insulation design of extra-high voltage equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-voltage equipment simulation, and in particular relates to a dynamic arc simulation method for an isolating switch taking contact action into consideration and a related system thereof. Background Art

[0002] With the development of ultra-high voltage (UHV) power grids, the problem of very fast transient overvoltage (VFTO) caused by dynamic arc reignition during disconnector operation has become increasingly prominent. Circuit breaker failures during disconnector operation are a common occurrence. For example, on May 8, 2020, a 750 kV urban transformer resumed power after the initial inspection of the 750 kV Chengqu Line 2. When closing the 75222 disconnector, the 750 kV II bus tripped. Inspection revealed abnormal SF6 composition in the arc extinguishing chamber of phase C of the 75222 circuit breaker, leading to preliminary diagnosis of an internal circuit breaker fault, including insulation erosion. Failure to accurately simulate the arc reignition process will impede effective suppression of VFTO levels, resulting in reduced lifespan of electrical equipment, circuit breaker failure, and ultimately, impacting the stable operation of the power system.

[0003] The prior art has modeled and analyzed the arc generation process during the operation of the disconnector. In the invention patent with publication number CN114626321A: A dynamic reignition arc resistance simulation model for an AIS disconnector and its modeling method, the method adopts a modular design, including a series branch switch consisting of a controlled switch and a controlled resistor, to achieve the coordinated operation of the control module and the arc resistance control module, dynamically adjust the switch state and resistance value, and realize the simulation of the dynamic process of multiple reignition and extinction of the switch gap arc. However, this method fails to accurately establish a dynamic mapping relationship model between the break distance and the breakdown voltage, and the linearization assumption of the dielectric strength recovery curve between the contacts adopted is significantly different from the actual situation. This idealized processing method ignores the nonlinear characteristics of the dielectric recovery process, resulting in large errors in the arc reignition judgment link, making it difficult to meet the accuracy requirements of actual engineering applications. The reignition judgment criteria adopted fail to fully reflect the nonlinear dielectric recovery characteristics under actual working conditions.

[0004] In the invention patent with publication number CN108988330B, "A Power System Simulation Method Considering Disconnector Arcing," the method establishes a corresponding relationship between the disconnect distance and the breakdown voltage during the disconnector opening / closing process through field testing. Combined with the disconnector opening / closing action curves, the method ultimately establishes a curve showing the breakdown voltage versus time during the disconnector opening / closing process. However, this method relies heavily on field test data, which is significantly limited in its engineering application and adaptability due to the harsh test conditions, high costs, and applicability only to specific models.

[0005] In summary, current disconnector arc simulation models fail to fully account for contact motion, resulting in significant errors in arc restrike characteristics and VFTO predictions. Field experiments establishing the corresponding relationship between the break distance and breakdown voltage during disconnector opening and closing are difficult and expensive. Therefore, a dynamic disconnector arc modeling method that considers contact motion is urgently needed to accurately simulate arc restrike and assess overvoltage risks during disconnector operation. Summary of the Invention

[0006] The present invention provides a dynamic arc simulation method for disconnectors that takes contact movement into consideration and a related system thereof, in order to solve the technical problems existing in the prior art of disconnector arc simulation models, such as insufficient consideration of the contact movement process, large errors in the prediction of arc restrike characteristics and VFTO, and high operational difficulty, high test cost, and limited engineering promotion and adaptability in field tests of disconnectors.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: A method for simulating dynamic arc of an isolating switch considering contact movement includes the following steps: Based on the actual size parameters of the disconnector, a three-dimensional geometric model of the disconnector is established; The 3D geometric model of the disconnector is placed in the simulation software to simulate the motion of the moving arc contact in the disconnector and obtain the dielectric strength recovery curve of the disconnector. Construct an electromagnetic simulation circuit that takes into account the arc restrike process, simulate the dynamic arcing process of the disconnector, and obtain the voltage difference between the two ends of the disconnector and the current of the isolating switch , according to the voltage difference across the isolating switch , current The arc extinguishing or arcing state of the isolating switch is judged by the dielectric strength recovery curve of the isolating switch, and the electromagnetic simulation circuit is controlled to simulate the arc state of the isolating switch according to the judgment result, so as to realize the closed-loop simulation of the arcing-extinction alternating state of the isolating switch.

[0008] The method of establishing a simplified three-dimensional model of the isolating switch based on the actual size parameters of the isolating switch is as follows: based on the size parameters of the actual isolating switch, a 1:1 scale three-dimensional geometric model of the isolating switch is established. The established three-dimensional geometric model of the isolating switch includes the following structural features: a conductive knife assembly, a static contact, a grading ring device and a moving arc-striking contact. The spatial relative position and connection method between the conductive knife assembly, the static contact, the grading ring device and the moving arc-striking contact are consistent with the actual isolating switch.

[0009] The dielectric strength recovery curve of the isolating switch is obtained by placing the three-dimensional geometric model of the isolating switch into the simulation software, performing multi-physics field simulation and electric field cycle simulation on the isolating switch, and obtaining the breakdown voltage of the isolating switch at different movement distances of the moving arc contact. The voltage-distance function and distance-time function of the disconnector are fitted according to the movement speed of the moving arc-striking contact. The voltage-time function of the disconnector is further fitted based on the voltage-distance function and distance-time function of the disconnector to obtain the dielectric strength recovery curve of the disconnector.

[0010] The multi-physics field simulation and electric field circulation simulation of the disconnector require setting three media, copper conductor, polytetrafluoroethylene, and air, for the three-dimensional geometric model of the disconnector in the simulation software to perform the multi-physics field simulation and electric field circulation simulation. The spatial electric field formed by the three media, copper conductor, polytetrafluoroethylene, and air, in the three-dimensional geometric model of the disconnector must meet the following conditions:

[0011] Where, : The total current density includes the conduction current density and the displacement current density, : volume density of the current source, : Imaginary number, : angular frequency, : conductivity, : electric displacement vector, : electric field strength, : Electric potential.

[0012] The voltage difference across the isolating switch It can characterize the recovery process of the arc gap voltage of the isolating switch. The dielectric strength recovery curve of the isolating switch is the voltage difference between the two ends of the isolating switch. and time t Function curve, at the same time t Under the conditions, the formula is satisfied: When the disconnector is in the open position, the gap arc of the disconnector enters the arc burning state.

[0013] The voltage difference across the isolating switch The calculation formula is as follows:

[0014] Where, is the voltage on the power supply side of the isolation switch, is the load side voltage of the isolating switch.

[0015] According to the current Determine the arc extinction state of the disconnector at time , isolation switch current With the previous Current at the moment The result of multiplication is less than 0, and the difference between the two is less than a constant , then it can be determined that the gap arc of the disconnector has entered the extinguishing stage.

[0016] A dynamic arc simulation system for an isolating switch taking contact action into consideration includes a data acquisition unit, a model building unit, an isolating switch motion simulation unit, and a dynamic arc state simulation unit; A data acquisition unit, used to acquire dimensional parameter data of an actual disconnector; A model building unit, used for building a three-dimensional geometric model of the disconnector based on actual size parameters of the disconnector; The isolating switch motion simulation unit is used to place the 3D geometric model of the isolating switch into the simulation software, simulate the motion process of the moving arc-striking contact in the isolating switch, and obtain the dielectric strength recovery curve of the isolating switch; Dynamic arc simulation unit, used to build electromagnetic simulation circuit considering arc reignition process, as well as the voltage difference across the disconnector and the current of the isolating switch I , according to the voltage difference across the isolating switch , current The arc extinguishing or arcing state of the disconnector is judged by the dielectric strength recovery curve of the disconnector, and the arc state of the disconnector is simulated according to the judgment result to realize the closed-loop simulation of the arcing-extinction alternating state of the disconnector.

[0017] An electronic device comprises a memory and a processor, wherein the memory stores a computer program and the processor implements the steps of a dynamic arc simulation method for an isolating switch taking contact action into consideration when executing the computer program.

[0018] A storage medium stores a computer program, which, when executed by a processor, implements the steps of a dynamic arc simulation method for an isolating switch taking contact action into consideration.

[0019] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a dynamic arc simulation method for disconnectors that takes contact action into account. It fully considers the interactive effects of mechanical motion and arc physics, and the relationship between contact speed, gap distance, and breakdown field strength. This method overcomes the shortcomings of existing methods that use linear dielectric strength curves, and accurately characterizes the impact of the dynamic contact separation process on transient overvoltage. This method constructs a dynamic arc model that considers contact motion characteristics and an arc criterion system that considers the nonlinear recovery of dielectric strength through multi-physical field coupling modeling. Compared to traditional simulation methods, the method proposed by the present invention fully retains the coupling relationship of electric field distortion during contact separation, and the simulated arc reignition process is more in line with engineering practice.

[0020] Furthermore, the present invention proposes a dynamic arc simulation method for disconnectors that takes contact motion into account. Based on the dimensional parameters of an actual disconnector, a 1:1 scale three-dimensional geometric model is constructed, encompassing the conductive blade assembly, static contacts, grading ring device, and moving arcing contacts. The relative spatial positions and connections of these components are consistent with the actual design. This fundamentally ensures a high degree of consistency between the model and the actual disconnector, providing an accurate basis for subsequent simulation of the moving arcing contact movement and analysis of arc characteristics. This avoids simulation errors caused by model distortion and addresses the problem that existing models fail to adequately consider the actual disconnector structure. The 3D geometric model is then placed in simulation software to simulate the movement of the moving arcing contact. Through multi-physics and electric field cycle simulations, the breakdown voltage and velocity at different movement distances are determined, and a dielectric strength recovery curve is obtained by fitting a related function. This process fully accounts for the dynamic impact of contact motion on the arc, accurately capturing changes in arc length and electric field distribution during contact motion. This allows the simulation to accurately reflect the dielectric strength recovery of the disconnector during actual operation, effectively addressing the shortcomings of existing technologies that insufficiently consider contact motion and improving arc simulation accuracy.

[0021] Furthermore, an electromagnetic simulation circuit was constructed to account for the arc reignition process. This simulated the dynamic arcing process, obtained the voltage difference and current across the disconnector, and combined with the dielectric strength recovery curve to determine the arc extinction or arcing state, achieving a closed-loop simulation. By simulating arc reignition with the electromagnetic simulation circuit and combining it with real-time monitored voltage, current, and dielectric strength data, the arc state was accurately determined and feedback was used to adjust the simulation. This effectively reduced the prediction error of the arc reignition characteristics and VFTO, and more accurately predicted the dynamic changes of the disconnector arc than existing technologies.

[0022] Furthermore, the simulation software was designed to simulate three media—copper conductors, polytetrafluoroethylene, and air—to meet specific spatial electric field conditions and conduct multi-physics field simulations and electric field loop simulations. The electrical properties of different media vary significantly, and by fully considering their impact on the electric field distribution, parameters such as the disconnector's breakdown voltage were accurately calculated. This optimized dielectric strength recovery curve provided a reliable basis for arc state assessment, improving the overall accuracy and reliability of the simulation model.

[0023] The present invention also proposes a dynamic arc simulation system for disconnectors that takes contact motion into account. A data acquisition unit is specifically responsible for acquiring dimensional parameter data of actual disconnectors, ensuring the authenticity and accuracy of the data. This provides a reliable data foundation for subsequent model construction, fundamentally ensuring the reliability of the simulation system and preventing distortion of subsequent simulation results due to data errors. This aligns with the precise modeling required by the simulation method, laying the foundation for the effective operation of the entire system. The model construction unit constructs a three-dimensional geometric model based on the dimensional parameters of the actual disconnector provided by the data acquisition unit. By accurately recreating the actual disconnector structure, consistent with the modeling techniques used in the simulation method, this system provides an accurate model for disconnector motion simulation and arc state simulation. This allows the entire system to operate based on a realistic and reliable model, improving the accuracy of the system's simulation results. The disconnector motion simulation unit then loads the constructed three-dimensional geometric model into the simulation software, simulating the motion of the arcing contacts to obtain a dielectric strength recovery curve. This unit leverages the core technology of the simulation method for dynamic contact motion simulation, ensuring that the system accurately reflects the impact of contact motion on the disconnector's dielectric strength in real time. This unit provides key data support for the dynamic arc state simulation unit, enhancing the system's ability to simulate the actual operating state of the disconnector. The dynamic arc simulation unit constructs an electromagnetic simulation circuit that takes the arc reignition process into account. It determines the arc state based on voltage difference, current, and dielectric strength recovery curves, achieving closed-loop simulation. This unit fully utilizes closed-loop simulation techniques within simulation methods. Through real-time monitoring and judgment, it accurately simulates the alternating arcing and extinction states of disconnectors. Compared to existing technologies, this system offers superior arc state simulation capabilities, providing more reliable simulation results and decision-making support for engineering applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 : 3D geometric model diagram of disconnector; Figure 2 : Schematic diagram of multi-physics simulation of disconnector; Figure 3 : dielectric strength recovery curve fitting curve; Figure 4 : Isolating switch external circuit control module; Figure 5 :Flowchart of the simulation method for dynamic arc state of disconnector; Figure 6 : Dynamic arcing characteristic state transition diagram of disconnector; Figure 7 : Voltage waveform on both sides of the isolating switch; Figure 8 : Schematic diagram of the disconnector dynamic arc state assessment system module; Figure 9: Schematic diagram of the storage medium structure of the electronic device for dynamic arc state evaluation of the disconnector; Figure 10 : Schematic diagram of electromagnetic simulation circuit considering the arc restrike process. DETAILED DESCRIPTION

[0025] In order to further understand the content of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0026] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] Example 1 like Figure 5 As shown, this embodiment proposes a dynamic arc simulation method for an isolating switch considering the contact action process, comprising the following steps: Based on the dimensional parameters of an actual disconnector, a 1:1 scale 3D geometric model of the disconnector was established. During the modeling process, the structural components that play a decisive role in the electric field distribution of the disconnector, including the conductive blade, static contact, grading ring, and moving arc contact, were retained. The conductive properties of the disconnector were further simulated by accurately simulating its geometry. The contact surface roughness parameters of the static contact were optimized to realistically reflect electrical contact behavior. The ring diameter and spatial installation position of the grading ring were further optimized, while the motion trajectory of the moving arc contact was fully preserved. The relative spatial positions and connection methods of the conductive blade assembly, static contact, grading ring, and moving contact remained consistent with those of the actual disconnector. This ensured a highly realistic model that accurately simulated the electric field distribution, electromagnetic force, and other physical phenomena of the actual disconnector, laying the foundation for accurate simulation of the disconnector's dynamic arcing process. Furthermore, to improve computational efficiency, non-critical components of the disconnector, such as fastening bolts and supporting brackets, were removed to achieve an optimal balance between computational accuracy and efficiency.

[0028] Placing the three-dimensional geometric model of the disconnector into simulation software and simulating the movement of the moving arcing contact in the simulation software can more accurately consider the key factor of contact action. Compared with existing models, this overcomes the problem of insufficient consideration of the contact movement process, thus laying the foundation for accurate simulation of arc restrike.

[0029] By simulating the movement process of the moving arc-striking contact in the disconnector, the dielectric strength recovery curve of the disconnector is obtained, which can more realistically reflect the dielectric recovery characteristics of the disconnector in actual operation, provide a key basis for the subsequent accurate judgment of the arc extinction or arcing state, and help improve the accuracy of the simulation of arc restrike characteristics.

[0030] By constructing an electromagnetic simulation circuit that takes the arc reignition process into account to simulate the dynamic arcing process, the electrical characteristics of the disconnector during operation can be more comprehensively considered. Parameters such as the voltage difference and current across the disconnector obtained through the electromagnetic simulation circuit are combined with the dielectric strength recovery curve to accurately determine the disconnector's arcing or arcing state, thereby simulating the disconnector's dynamic arcing. Simulating the dynamic arcing of the disconnector through simulation reduces reliance on field testing, avoiding the harsh and costly conditions of field testing and the fact that test results are only applicable to specific models. This approach has high engineering scalability and adaptability, providing effective technical support for the design, operation, and maintenance of disconnectors in various scenarios.

[0031] In a further preferred embodiment of the present invention, the dielectric strength recovery curve of the isolating switch is obtained, specifically: the three-dimensional geometric model of the isolating switch is placed in the COMSOL simulation software, and multi-physics field simulation and electric field cycle simulation are performed on the isolating switch to obtain the breakdown voltage of the isolating switch at different movement distances of the moving arc contact. The voltage-distance and distance-time functions of the disconnector are fitted based on the velocity of the moving arcing contact. Based on these voltage-distance and distance-time functions, the voltage-time function of the disconnector is further fitted to obtain the disconnector's dielectric strength recovery curve. Multi-physics simulation and electric field cycle simulation account for the interaction of multiple physical factors and the dynamic changes in the electric field, enabling a more comprehensive and accurate understanding of the disconnector's electrical characteristics under different contact motion states. Furthermore, by fitting the voltage-distance and distance-time functions, the voltage-time function and dielectric strength recovery curve are derived. This method accurately describes the temporal variation of the disconnector's dielectric strength, providing an accurate basis for determining arc extinction or reignition.

[0032] In a further preferred embodiment of the present invention, multi-physics field simulation and electric field circulation simulation are performed on the disconnector. In the simulation software, three media, namely, copper conductor, polytetrafluoroethylene, and air, are set for the three-dimensional geometric model of the disconnector to perform multi-physics field simulation and electric field circulation simulation. The spatial electric field formed by the three media, namely, copper conductor, polytetrafluoroethylene, and air, in the three-dimensional geometric model of the disconnector must meet the following conditions:

[0033] Where, : The total current density includes the conduction current density and the displacement current density, : volume density of the current source, : Imaginary number, : angular frequency, : conductivity, : electric displacement vector, : electric field strength, By setting the three media—copper conductor, polytetrafluoroethylene, and air—in the simulation software and ensuring that they meet specific spatial point conditions, the complex electromagnetic field distribution inside the disconnector can be accurately simulated. This also takes into account the impact of different media on the electric field and current distribution, making the simulation results more consistent with reality and improving the accuracy and reliability of the simulation.

[0034] In a further preferred embodiment of the present invention, the voltage difference across the isolating switch is It can characterize the recovery process of the arc gap voltage of the isolating switch. The dielectric strength recovery curve of the isolating switch is the voltage difference between the two ends of the isolating switch. and time t The function curve of , under the same time t conditions, satisfies the formula: When the arc of the disconnector enters the arcing state, the gap arc of the disconnector enters the arcing state. In the process of judging the arcing state of the disconnector, the voltage difference across the disconnector can be used to characterize the arc gap voltage recovery process, and the arcing state can be judged by comparing it with the dielectric strength recovery curve. This provides a clear and definite quantitative standard for judging whether the disconnector is arcing or arcing, which helps to accurately analyze the arc state of the disconnector under different working conditions. Among them, the voltage difference across the disconnector is The calculation formula is as follows:

[0035] Where, is the voltage on the power supply side of the isolation switch, is the load side voltage of the isolating switch.

[0036] In a further preferred embodiment of the present invention, according to the current Determine the arc extinction state of the disconnector at time , isolation switch current With the previous Current at the moment The result of multiplication is less than 0, and the difference between the two is less than a constant , then it can be determined that the disconnector's gap arc has entered the extinction stage. By determining the disconnector's arc extinction state through the product and difference of currents at different times, this provides an arc extinction determination method based on current variation characteristics. Combined with a voltage-based determination method, this method can more comprehensively and accurately capture the disconnector's arc extinction process, improving the accuracy of the disconnector's dynamic arc state assessment.

[0037] Example 2 This embodiment is based on the GW7B-800 three-column disconnector as the research object. The structure of the GW7B-800 three-column disconnector is as follows: Figure 1As shown in , based on the actual size parameters of the GW7B-800 three-column disconnector, the symmetrical structural characteristics of the equipment are used to reduce the modeling complexity, focusing on retaining the key features that affect the contact movement characteristics, and constructing a 1:1 scale three-dimensional geometric model of the disconnector, as shown in Figure 2 The 3D geometric model of the disconnector significantly improves the computational efficiency of dynamic arc simulation while maintaining computational accuracy. It includes the following key structures: the conductive blade assembly, static contact, grading ring device, and moving arc-striking contact. The spatial relative position and connection method of these components are consistent with the actual product.

[0038] Will Figure 1 The 3D geometric model of the disconnector shown was imported into COMSOL, a finite element simulation and electric field analysis software, for multi-physics simulation and electric field loop simulation. In COMSOL, the three media used in the 3D geometric model of the disconnector were copper conductor, polytetrafluoroethylene, and air. The material parameters for these three media are shown in Table 1 below.

[0039] Table 1

[0040] Boundary conditions are set for the copper conductor, polytetrafluoroethylene, and air in the three-dimensional geometric model of the disconnector. The spatial electric field formed by the copper conductor, polytetrafluoroethylene, and air in the three-dimensional geometric model of the disconnector must meet certain conditions to ensure that the simulation area of the three-dimensional geometric model of the disconnector satisfies current conservation. The spatial electric field must meet the following conditions:

[0041] Where, : The total current density includes the conduction current density and the displacement current density, : volume density of the current source, : Imaginary number, : angular frequency, : conductivity, : electric displacement vector, : electric field strength, : Electric potential.

[0042] Perform multi-physics simulation and electric field cycle simulation on the disconnector to obtain the breakdown voltage of the disconnector at different movement distances of the moving arc contact The voltage-distance function and distance-time function of the disconnector are fitted based on the movement speed of the arc-striking contact. The voltage-time function of the disconnector is further fitted based on the voltage-distance function and distance-time function of the disconnector. The voltage-time function of the disconnector is: , the dielectric strength recovery curve of the disconnector is obtained according to the voltage-time function of the disconnector, such as Figure 3 shown.

[0043] In the PSCAD simulation software, an electromagnetic simulation circuit considering the arc restrike process is constructed, such as Figure 10 As shown, the disconnector is accurately modeled within the dashed box. R(t) The arc resistance model uses the classic Mayr dynamic resistance model, where L is the equivalent inductance of the disconnector gap, C1 is the capacitance of the disconnector gap, C2 is the capacitance of the disconnector's moving arcing contact to ground, C3 is the capacitance of the disconnector's static contact to ground, and C4 is the equivalent capacitance in the circuit breaker's open state. This electromagnetic simulation circuit simulates the dynamic arcing process of the disconnector, and during the simulated dynamic arcing process of the disconnector, the voltage difference across the disconnector is obtained in real time. and the current of the isolating switch , according to the voltage difference across the isolating switch , current The arc extinguishing or arcing state of the isolating switch is determined by the recovery curve of the isolating switch's dielectric strength. The recovery process of the isolating switch's arc gap voltage and the recovery process of the gap dielectric strength jointly determine the breakdown state of the isolating switch's arc gap. Characterize the recovery process of the arc gap voltage of the disconnector, the breakdown voltage of the disconnector at different movement distances of the moving arc contact in the dielectric strength recovery curve function of the disconnector Characterizes the recovery process of gap medium strength. t When the voltage difference between the two ends of the isolation switch is The breakdown voltage of the disconnector at different moving distances of the moving arc contact in the dielectric strength recovery curve function of the disconnector For comparison:

[0044] When the voltage difference between the two ends of the isolating switch The breakdown voltage of the disconnector at different moving distances of the moving arc contact in the dielectric strength recovery curve function of the disconnector When the above formula is met, the dynamic arc of the disconnector is in the arcing state, the gap breaks down, a transient process occurs, and a high-frequency transient current is generated. The disconnector is in the on state, the bus side and the power side are connected, and the bus energy and the power supply energy are redistributed.

[0045] During the arc extinction determination process of the disconnector, at time t When the current through the isolating switch is collected , at this time, if the isolation switch current With the previous Current at the moment The result of multiplication is less than 0, and the difference between the two is less than a constant , it can be determined that the disconnector's dynamic arc has entered the arc extinction phase. Based on this determination, the electromagnetic simulation circuit is controlled to simulate the disconnector's arc state, achieving a closed-loop simulation of the disconnector's alternating arcing and extinction states. Using the disconnector's dynamic arc extinction and arcing criteria, the arc state is updated in real time. Arcing corresponds to an ultra-fast transient process, while arc extinction corresponds to the gap insulation recovery process, with transient and steady-state processes repeating in a repetitive cycle.

[0046] Example 3 like Figure 8 As shown, this embodiment proposes a dynamic arc simulation system for disconnectors considering contact action, comprising a data acquisition unit, a model building unit, a simulation unit, and a dynamic arc state evaluation unit; A data acquisition unit, used to acquire dimensional parameter data of an actual disconnector; The model building unit is used to establish a 1:1 scale three-dimensional geometric model of the disconnector based on the actual size parameters of the disconnector. During the modeling process, non-critical influencing components in the disconnector are eliminated, and the structural components in the disconnector that play a decisive role in the electric field distribution are retained, including the conductive knife, static contact, grading ring and moving arc contact. The spatial relative position and connection method between the conductive knife assembly, static contact, grading ring device and moving arc contact are consistent with the actual disconnector.

[0047] The simulation unit is used to place the 3D geometric model of the disconnector into the simulation software, simulate the motion process of the moving arc contact in the disconnector, and obtain the dielectric strength recovery curve of the disconnector; construct an electromagnetic simulation circuit considering the arc restrike process to obtain the voltage difference between the two ends of the disconnector and the current of the isolating switch , Dynamic arc simulation unit is used to construct electromagnetic simulation circuit considering arc reignition process. Figure 10 As shown, the dynamic arc burning process of the isolating switch is simulated to obtain the voltage difference between the two ends of the isolating switch. and the current of the isolating switch , according to the voltage difference across the isolating switch , current The module uses the isolator's dielectric strength recovery curve to determine whether the isolator is arcing or extinguished. Based on this determination, the electromagnetic simulation circuit simulates the isolator's arcing state, enabling closed-loop simulation of the isolator's alternating arcing and extinction states. This module seamlessly integrates with the external circuit equivalent models of mainstream electromagnetic transient simulation software, fully reproducing the energy redistribution mechanism and high-frequency transient characteristics during the VFTO (Very Fast Transient Overvoltage) generation process.

[0048] In another preferred solution of this embodiment, a control module is provided in the dynamic arc simulation unit, such as Figure 4 (a) and 4 (b), Figure 4 (a) is a schematic diagram of the structure of the control module in the electromagnetic simulation circuit. Figure 4 (b) is a schematic diagram of the control module, where Figure 4 (a) It needs to be connected to the simulated main circuit to obtain the current and voltage values required during the transient switching process of the disconnector in real time. Figure 4 (b) is a custom control module in this embodiment, namely Figure 4 In the chopping reignition in (b), the arcing and arcing criterion are set in each simulation step, and the control module controls the current passing through the isolating switch according to the obtained current. The voltage difference across the isolating switch , judge the arcing or arcing state, and output the control signal according to the judgment result , used to control the state of the disconnector DS in real time, control signal 0 or 1, when the reignition criterion is met, the control signal The output is 0, simulating the arc reignition process; when the arc extinction criterion is met, the control signal The output is 1, simulating the arc extinction process.

[0049] By adjusting the subsequent simulation process based on the current state judgment results in real time, and deriving output values in the customized control module based on the arcing and arcing extinction criteria to control the state of the disconnector DS in real time, the simulation can be made closer to the actual working conditions of the disconnector, and the simulation results can be continuously optimized and corrected to more accurately simulate the dynamic process of arcing and arcing extinction of the disconnector, thereby improving the accuracy and reliability of the simulation.

[0050] like Figure 6 (a) shows the curve of the gap voltage and the withstand voltage of the disconnector. The intersection of the two indicates the reignition time. Figure 6 (b) is a real-time logic state diagram of the isolation switch in the study area, and the control signal When the output value is 1, it means that the arc of the isolating switch is in the arc extinguishing state; the control signal The output value is 0, which means the isolating switch is in arcing state. The voltage waveform on the power supply side of the isolating switch is as follows: Figure 7 As shown in (a). Before the reignition occurs, the isolating switch is in the disconnected state, and the voltage on the power supply side of the isolating switch changes sinusoidally with the power supply; when the reignition occurs, the VFTO pulse is generated, and the two are superimposed to form the waveform of the voltage on the power supply side of the isolating switch. The voltage waveform on the load side of the isolating switch is as follows: Figure 7 As shown in (b), before the reignition occurs, the disconnector is in the open state, but there is residual pressure on the load-side busbar from the last gap conduction.

[0051] Example 4 See also Figure 9 As shown, the present invention also provides an electronic device 100 for a dynamic arc simulation method for an isolating switch taking into account the contact action process; the electronic device 100 includes a memory 101, at least one processor 102, a computer program 103 stored in the memory 101 and capable of running on the at least one processor 102, and at least one communication bus 104.

[0052] The memory 101 can be used to store the computer program 103. The processor 102 implements the steps of the disconnector dynamic arc simulation considering the contact operation process described in Example 1 by running or executing the computer program stored in the memory 101 and calling the data stored in the memory 101. The memory 101 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function (such as a sound playback function, an image playback function, etc.); the data storage area can store data (such as audio data) created based on the use of the electronic device 100. In addition, the memory 101 can include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device.

[0053] The at least one processor 102 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor 102 may be a microprocessor or any conventional processor, etc. The processor 102 is the control center of the electronic device 100 and connects various parts of the entire electronic device 100 using various interfaces and lines.

[0054] The memory 101 in the electronic device 100 stores a plurality of instructions to implement a method for simulating a dynamic arc of an isolating switch taking into account a contact action process. The processor 102 can execute the plurality of instructions to implement: Based on the actual size parameters of the disconnector, a three-dimensional geometric model of the disconnector is established; The 3D geometric model of the disconnector is placed in the simulation software to simulate the motion of the moving arc contact in the disconnector and obtain the dielectric strength recovery curve of the disconnector. Construct an electromagnetic simulation circuit that takes into account the arc restrike process, simulate the dynamic arcing process of the disconnector, and obtain the voltage difference between the two ends of the disconnector and the current of the isolating switch , according to the voltage difference across the isolating switch , current The arc extinguishing or arcing state of the disconnector is judged by the dielectric strength recovery curve of the disconnector, and the arc state of the disconnector is simulated according to the judgment result to realize the closed-loop simulation of the arcing-extinction alternating state of the disconnector.

[0055] Example 5 If the module / unit integrated in the electronic device 100 is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory and read-only memory (ROM, Read-Only Memory).

[0056] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0057] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0058] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0059] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0060] In addition, it should be understood that although this specification describes the embodiments, not every embodiment contains only one independent technical solution. This description is for clarity only. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for the purpose of illustrating the technical concept of the present invention and cannot be used to limit the scope of protection of the present invention. Any changes made based on the technical solution in accordance with the technical concept proposed by the present invention fall within the scope of protection of the claims of the present invention.

Claims

1. A dynamic arc simulation method for an isolating switch considering contact action, characterized in that: The following steps are involved: Based on the actual size parameters of the disconnector, a three-dimensional geometric model of the disconnector is established; The 3D geometric model of the disconnector is placed in the simulation software to simulate the motion of the moving arc contact in the disconnector and obtain the dielectric strength recovery curve of the disconnector. Construct an electromagnetic simulation circuit that takes into account the arc restrike process, simulate the dynamic arcing process of the disconnector, and obtain the voltage difference between the two ends of the disconnector and the current of the isolating switch , according to the voltage difference across the isolating switch , current The arc extinguishing or arcing state of the isolating switch is judged by the dielectric strength recovery curve of the isolating switch, and the electromagnetic simulation circuit is controlled to simulate the arc state of the isolating switch according to the judgment result, so as to realize the closed-loop simulation of the arcing-extinction alternating state of the isolating switch.

2. A method for dynamic arc simulation of an isolating switch considering contact action according to claim 1, characterized in that: The method of establishing a simplified three-dimensional model of the isolating switch based on the actual size parameters of the isolating switch is as follows: a 1:1 scale three-dimensional geometric model of the isolating switch is established based on the size parameters of the actual isolating switch. The established three-dimensional geometric model of the isolating switch includes the following structural features: The conductive knife assembly, static contact, grading ring device and moving arc contact, and the spatial relative positions and connection methods between the conductive knife assembly, static contact, grading ring device and moving arc contact are consistent with the actual disconnector.

3. The method for dynamic arc simulation of an isolating switch considering contact action according to claim 1, characterized in that: The dielectric strength recovery curve of the isolating switch is obtained by placing the three-dimensional geometric model of the isolating switch into the simulation software, performing multi-physics field simulation and electric field cycle simulation on the isolating switch, and obtaining the breakdown voltage of the isolating switch at different movement distances of the moving arc contact. The voltage-distance function and distance-time function of the disconnector are fitted according to the movement speed of the moving arc-striking contact. The voltage-time function of the disconnector is further fitted based on the voltage-distance function and distance-time function of the disconnector to obtain the dielectric strength recovery curve of the disconnector.

4. The method for dynamic arc simulation of an isolating switch considering contact action according to claim 3, characterized in that: The multi-physics field simulation and electric field circulation simulation of the disconnector require setting three media, copper conductor, polytetrafluoroethylene, and air, for the three-dimensional geometric model of the disconnector in the simulation software to perform the multi-physics field simulation and electric field circulation simulation. The spatial electric field formed by the three media, copper conductor, polytetrafluoroethylene, and air, in the three-dimensional geometric model of the disconnector must meet the following conditions: Where, : The total current density includes the conduction current density and the displacement current density, : volume density of the current source, : Imaginary number, : angular frequency, : conductivity, : electric displacement vector, : electric field strength, : Electric potential.

5. The method for dynamic arc simulation of an isolating switch considering contact action according to claim 1, characterized in that: The voltage difference across the isolating switch It can characterize the recovery process of the arc gap voltage of the isolating switch. The dielectric strength recovery curve of the isolating switch is the voltage difference between the two ends of the isolating switch. and time t Function curve, at the same time t Under the conditions, the formula is satisfied: When the disconnector is in the open position, the gap arc of the disconnector enters the arc burning state.

6. A method for simulating dynamic arc of an isolating switch considering contact action according to claim 6, characterized in that: The voltage difference across the isolating switch The calculation formula is as follows: Where, is the voltage on the power supply side of the isolation switch, is the load side voltage of the isolating switch.

7. The method for dynamic arc simulation of an isolating switch considering contact action according to claim 1, characterized in that: According to the current Determine the arc extinction state of the disconnector at time , isolation switch current With the previous Current at the moment The result of multiplication is less than 0, and the difference between the two is less than a constant , then it can be determined that the gap arc of the disconnector has entered the extinguishing stage.

8. A dynamic arc simulation system for disconnectors considering contact movement, based on a dynamic arc simulation method for disconnectors considering contact movement according to any one of claims 1 to 7, characterized in that: It includes a data acquisition unit, a model building unit, an isolating switch motion simulation unit and a dynamic arc state simulation unit; A data acquisition unit, used to acquire dimensional parameter data of an actual disconnector; A model building unit, used for building a three-dimensional geometric model of the disconnector based on actual size parameters of the disconnector; The isolating switch motion simulation unit is used to place the 3D geometric model of the isolating switch into the simulation software, simulate the motion process of the moving arc-striking contact in the isolating switch, and obtain the dielectric strength recovery curve of the isolating switch; Dynamic arc simulation unit, used to build electromagnetic simulation circuit considering arc reignition process, as well as the voltage difference across the disconnector and the current of the isolating switch I , according to the voltage difference across the isolating switch , current The arc extinguishing or arcing state of the disconnector is judged by the dielectric strength recovery curve of the disconnector, and the arc state of the disconnector is simulated according to the judgment result to realize the closed-loop simulation of the arcing-extinction alternating state of the disconnector.

9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method for dynamic arc simulation of an isolating switch considering contact action according to any one of claims 1 to 7 are implemented.

10. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of a method for dynamic arc simulation of an isolating switch considering contact action according to any one of claims 1 to 7 are implemented.

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