Method for measuring point optimization for generator circuit breaker loop resistance measurement and related apparatus

Abstract

The application belongs to the technical field of generator circuit breaker, and discloses a kind of measurement point optimization method for generator circuit breaker loop resistance measurement and related device, this method is simulated in three-dimensional finite element model first single-point current injection and calculates the error of loop resistance simulation value and theoretical value;If the error is out of limit, an equally spaced measurement point is added on the circumference of the circuit breaker, and the error under the new layout is recalculated by simulation;This process is repeated until the error meets the preset threshold, and the final required equally spaced measurement point quantity is output. Using this method significantly eliminates the position sensitivity error of single-point measurement, obtains stable measurement values that can truly represent the overall loop resistance, accurately assesses the performance state of the circuit breaker, and early detects potential defects such as poor contact, meets the stringent requirements of precise state assessment of high-current level equipment, and fundamentally solves the misjudgment problem caused by shunt effect of traditional methods.

Description

Technical Field

[0001] This invention belongs to the field of generator circuit breaker technology, and particularly relates to a method and related device for optimizing measurement points for measuring the circuit resistance of a generator circuit breaker. Background Technology

[0002] In the field of large generator sets and power systems, generator circuit breakers (GCBs) are critical protective devices ensuring equipment safety and grid stability. Their core mission is to instantaneously interrupt short-circuit currents exceeding 100kA during short-circuit faults. The value of the megawatt-class generators and offshore wind power converter systems they protect often exceeds 100 million yuan. Because they continuously bear ultra-high operating currents of 12kA to 40kA, the state of the GCB's conductive circuit directly determines the equipment's operational safety. Even slight abnormalities in circuit resistance can lead to serious accidents such as contact welding, insulation degradation, or even explosions. Therefore, relevant standards explicitly list circuit breaker circuit resistance as a key parameter that must be regularly tested. Accurate measurement of this resistance is not only a fundamental means of assessing the connection status and conductivity of the equipment's conductive circuit but also crucial data support for condition monitoring in intelligent operation and maintenance of power systems.

[0003] Currently, the industry commonly uses the DC voltage drop method to measure the circuit resistance of circuit breakers. This method applies a DC source across the circuit under test, samples the input voltage and current, and calculates the resistance value based on Ohm's law. It also has no specific requirements regarding the wiring position. However, for large-diameter generator circuit breakers with rated short-circuit currents exceeding 120kA, the cross-sectional area of ​​their current-carrying conductors is much larger than that of conventional circuit breakers. This causes the test current to shun along non-target paths within the conductor and distribute unevenly. This characteristic results in significant differences in resistance values ​​obtained at different wiring positions during single-point wiring measurements. The measurement results only reflect local potential differences rather than the true circuit resistance, leading to misjudgments of the generator circuit breaker's performance status by users. This hinders early identification of potential equipment defects and fails to meet the precise condition assessment requirements of large-diameter GCBs.

[0004] It is evident that the existing DC voltage drop method using a single-point connection is not applicable to large-diameter generator circuit breakers, making it difficult to accurately measure their circuit resistance and leading to inaccurate equipment performance status assessment. Summary of the Invention

[0005] This invention provides a method and related apparatus for optimizing measurement points for measuring the circuit resistance of a generator circuit breaker. This method can effectively solve the problem that the existing DC voltage drop method using a single-point connection is not applicable to large-diameter generator circuit breakers, and can meet the requirement of accurately measuring the circuit resistance of the generator circuit breaker, thus ensuring the accuracy of equipment performance status assessment.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A method for optimizing measurement points in generator circuit breaker circuit resistance measurement includes:

[0008] A three-dimensional finite element model was constructed based on the actual dimensions of the generator circuit breaker.

[0009] A single-point current injection simulation was performed using a three-dimensional finite element model to calculate the error between the simulated and theoretical values ​​of the loop resistance.

[0010] Measurement point addition process: If the error between the simulated value and the theoretical value of the loop resistance exceeds the preset threshold range, a measurement point is added on the circumference of the generator circuit breaker in the three-dimensional finite element model. The newly added measurement point is on the same circumference as the original measurement point and all measurement points are equidistantly distributed.

[0011] Error calculation process: The three-dimensional finite element model is subjected to current injection simulation and the error between the simulated value and the theoretical value of the loop resistance is recalculated;

[0012] Loop process: Repeat the process of adding measurement points and calculating errors until the error between the simulated value and the theoretical value of the loop resistance meets the preset threshold range, and output the final number of measurement points.

[0013] Furthermore, the actual dimensions of the generator circuit breaker include the outer diameter of the generator circuit breaker; after the cyclic process, it also includes:

[0014] The outer diameter of the generator circuit breaker was changed, the three-dimensional finite element model was reconstructed, and the single-point current injection simulation, measurement point addition process, error calculation process and error calculation process were re-executed;

[0015] Obtain the final number of measurement points corresponding to the outer diameter of multiple sets of different generator circuit breakers;

[0016] Based on the number of final measurement points corresponding to the outer diameter of multiple sets of different generator circuit breakers, a universal relationship table between outer diameter and minimum number of measurement points is established to guide the actual measurement of the circuit resistance of generator circuit breakers in practice.

[0017] Furthermore, the change in the outer diameter of the generator circuit breaker includes:

[0018] For generator circuit breakers of the same series, the outer diameter of the generator circuit breaker is continuously changed at preset intervals until the outer diameter reaches the maximum.

[0019] Furthermore, after performing single-point current injection simulation on the three-dimensional finite element model and calculating the error between the simulated and theoretical values ​​of the loop resistance, the process further includes:

[0020] If the error between the simulated value and the theoretical value of the loop resistance meets the preset threshold range, the final number of measurement points will be 1, which indicates that the optimal measurement point corresponding to the outer diameter of the current generator circuit breaker is 1.

[0021] Furthermore, in the process of performing single-point current injection simulation on the three-dimensional finite element model and calculating the error between the simulated and theoretical values ​​of the loop resistance, the simulated loop resistance value is calculated based on Ohm's law.

[0022] The specific formula for calculating the error between the simulated and theoretical values ​​of the loop resistance is as follows:

[0023] Error = ×100%

[0024] In the formula, R sim Represents the simulated value of the loop resistance; R theory This represents the theoretical value of the loop resistance.

[0025] Furthermore, during the process of adding the measurement points, the simulated value of the loop resistance is calculated based on the formula for parallel equivalent resistance, as follows:

[0026] 1 / R sim =1 / R1+1 / R2+…1 / R i

[0027] In the formula, R sim Represents the simulated value of the loop resistance; R i The value represents the resistance at each measurement point; i represents the number of measurement points, which is a positive integer.

[0028] Furthermore, the construction of the three-dimensional finite element model based on the actual dimensions of the generator circuit breaker includes:

[0029] Collect key geometric parameters of the conductive circuit of the generator circuit breaker; the key geometric parameters include: the outer diameter, wall thickness and total length of the generator circuit breaker, as well as the structural dimensions of key connection parts;

[0030] Initialize the conductivity, electrical boundary conditions, and current source excitation of the conductor material, and define the corresponding return points to form a complete simulation loop;

[0031] A three-dimensional finite element model was constructed based on the key geometric parameters of the generator circuit breaker's conductive circuit, the conductivity of the conductor material, the electrical boundary conditions, and the current source excitation.

[0032] A measurement point optimization system for measuring the circuit resistance of a generator circuit breaker includes:

[0033] The model building module is used to construct a three-dimensional finite element model based on the actual dimensions of the generator circuit breaker.

[0034] The simulation module is used to perform single-point current injection simulation on a three-dimensional finite element model and calculate the error between the simulated and theoretical values ​​of the loop resistance.

[0035] The measurement point addition module is used to execute the measurement point addition process; the measurement point addition process is as follows: if the error between the simulated value and the theoretical value of the loop resistance exceeds the preset threshold range, a measurement point is added on the circumference of the generator circuit breaker in the three-dimensional finite element model. The newly added measurement point is on the same circumference as the original measurement point and all measurement points are equidistantly distributed.

[0036] The calculation module is used to perform the error calculation process; the error calculation process involves performing current injection simulation on the three-dimensional finite element model and recalculating the error between the simulated value and the theoretical value of the loop resistance.

[0037] The iterative module is used to execute the loop process; the loop process is to repeatedly execute the measurement point addition process and the error calculation process until the error between the simulated value and the theoretical value of the loop resistance meets the preset threshold range, and then output the final number of measurement points.

[0038] A measurement point optimization device for measuring the circuit resistance of a generator circuit breaker, comprising:

[0039] Memory, used to store computer programs;

[0040] A processor is used to execute the computer program to implement the steps of the above-described method for optimizing measurement points for measuring the circuit resistance of a generator circuit breaker.

[0041] A computer-readable storage medium storing a computer program, which, when executed by a processor, is used to implement the steps of the above-described method for optimizing measurement points for measuring the circuit resistance of a generator circuit breaker.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] This invention provides a method for optimizing measurement points in generator circuit breaker circuit resistance measurement. The method first simulates single-point current injection in a three-dimensional finite element model and calculates the error between the simulated and theoretical circuit resistance values. If the error exceeds the limit, a measurement point is added at equal intervals on the circumference of the circuit breaker, and the error under the new point arrangement is recalculated. This process is repeated until the error meets a preset threshold, and the final required number of equidistant measurement points is output. Addressing the problem of non-uniform current distribution caused by the large conductor cross-sectional area, spatial potential sampling is performed through equidistant layout of multiple measurement points. Equidistant layout systematically covers the circumferential conductor cross-section, forcing the simulated current to be constrained to flow through more equivalent paths in the model, thereby more comprehensively capturing the actual potential field distributed on the conductor cross-section. The synthesis of multi-point measurement results effectively offsets the locality and randomness of single-location sampling, making the simulated value approximate the theoretical resistance value reflecting the overall conductivity characteristics. This method significantly eliminates the position sensitivity error of single-point measurement, obtains stable measurement values ​​that can truly characterize the overall circuit resistance, accurately assesses the performance status of circuit breakers, detects potential defects such as poor contact at an early stage, meets the stringent requirements for accurate condition assessment of high-current-level equipment, and fundamentally solves the problem of misjudgment caused by the shunting effect in traditional methods. Attached Figure Description

[0044] Figure 1 The overall current density distribution diagram of the single-point measurement wiring of the generator circuit breaker provided in this embodiment of the invention;

[0045] Figure 2 A flowchart illustrating the implementation of the method for optimizing measurement points for measuring the circuit resistance of a generator circuit breaker provided in this embodiment of the invention;

[0046] Figure 3 A flowchart of a method for optimizing measurement points for measuring the circuit resistance of a generator circuit breaker, provided as an embodiment of the present invention;

[0047] Figure 4 This is a schematic diagram of a measurement point optimization system for measuring the circuit resistance of a generator circuit breaker, provided in an embodiment of the present invention. Detailed Implementation

[0048] To further understand the content of this invention, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments are merely illustrative and not limiting of the invention.

[0049] To facilitate a better understanding of the technical solutions provided by this invention, the technical terms involved are explained as follows:

[0050] Large-diameter generator circuit breakers: Circuit breakers are devices capable of closing, continuously carrying, and interrupting rated current under normal operating conditions. They can also close, carry, and interrupt short-circuit currents not exceeding their specified rated current within a specified time. They are important switching devices in power systems, playing a crucial role in interrupting short-circuit faults and protecting the safe and stable operation of the power system. Large-diameter generator circuit breakers (Generator Circuit-Breakers) are high-current switching devices connecting generators and transformers. They typically have high rated current and breaking capacity, meeting the demands of high electrical loads and improving the reliability of the main transformer in generator sets. They are suitable for various types of large power plants, including nuclear, thermal, and hydropower plants. The technical solution proposed in this invention targets large-diameter generator circuit breakers with a rated short-circuit breaking current greater than or equal to 120kA and using SF6 as the arc-extinguishing medium.

[0051] Circuit resistance: Circuit breaker circuit resistance refers to the DC resistance value of its conductive circuit (including moving contacts, stationary contacts, conductive rods, terminals, etc.) when the circuit breaker is in the closed state, usually measured in microohms (μΩ). It is an important parameter for measuring the conductivity performance of the circuit breaker, reflecting the integrity of the conductive circuit and the contact quality.

[0052] Multi-point current sharing measurement: Multiple current injection and voltage measurement points are evenly arranged around the conductor circumference to improve the uniformity of current distribution.

[0053] Error threshold: refers to the maximum allowable deviation between the measured value and the theoretical value. In this embodiment, multi-point current sharing measurement is set: multiple current injection and voltage measurement points are evenly arranged around the conductor to improve the uniformity of current distribution.

[0054] Error threshold: refers to the maximum permissible deviation between the measured value and the theoretical value, which is set to 20% in this scheme.

[0055] As mentioned in the background section, traditional circuit breaker measurement methods use the DC voltage drop method. A DC source is applied across the resistor in the circuit breaker under test, and the voltage and current flowing through the input resistor are sampled. The resistance value is then calculated using Ohm's law. There are no requirements regarding the wiring location. However, the conductor cross-sectional area of ​​large-diameter generator circuit breakers is much larger than that of conventional circuit breakers. The test current is shunted along a non-target path, resulting in significant differences in the measured values ​​at different points. Single-point wiring measurements cannot accurately determine the performance status of the generator circuit breaker and can lead to misjudgments of its breaking capacity. In ANSYS Maxwell finite element software, the DC field calculation settings and mesh generation were completed. The calculation current was set to 1000A, with current entering from the left and exiting from the right. The overall current density distribution is as follows: Figure 1As shown, the uneven distribution of current electrons indicates that different wiring methods can lead to significant differences in the measured circuit resistance values ​​when measuring the circuit resistance of a large-diameter generator circuit breaker.

[0056] To achieve the above objectives, this embodiment provides an optimization method for measuring the circuit resistance of generator circuit breakers. This method establishes a three-dimensional finite element simulation model of the generator circuit breaker to simulate the circuit resistance measurement process of circuit breakers with different outer diameters under different numbers of current injection points. Through systematic error analysis, it determines the minimum number of measurement points required to meet engineering accuracy requirements and ultimately forms a universally applicable guiding specification, providing direct and reliable technical basis for field testing.

[0057] like Figure 3 As shown, this embodiment provides a method for optimizing measurement points for measuring the circuit resistance of a generator circuit breaker, including:

[0058] A three-dimensional finite element model was constructed based on the actual dimensions of the generator circuit breaker.

[0059] A single-point current injection simulation was performed using a three-dimensional finite element model to calculate the error between the simulated and theoretical values ​​of the loop resistance.

[0060] Measurement point addition process: If the error between the simulated value and the theoretical value of the loop resistance exceeds the preset threshold range, a measurement point is added on the circumference of the generator circuit breaker in the three-dimensional finite element model. The newly added measurement point is on the same circumference as the original measurement point and all measurement points are equidistantly distributed.

[0061] Error calculation process: The three-dimensional finite element model is subjected to current injection simulation and the error between the simulated value and the theoretical value of the loop resistance is recalculated;

[0062] Loop process: Repeat the process of adding measurement points and calculating errors until the error between the simulated value and the theoretical value of the loop resistance meets the preset threshold range, and output the final number of measurement points.

[0063] The optimization method provided in this embodiment will be further explained below with reference to the accompanying drawings:

[0064] like Figure 2 As shown in the figure, this embodiment provides a method for optimizing measurement points for measuring the circuit resistance of a generator circuit breaker. The specific steps are as follows:

[0065] Step 1: Simulation Model Construction

[0066] Geometric Modeling: A precise 3D model is created based on the actual dimensions of the target generator circuit breaker's conductive circuit (mainly referring to the main conductive rod). Key geometric parameters include: the circuit breaker's outer diameter, wall thickness, total length, and structural details of key connection parts (such as flanges and contacts). The conductor outer diameter range considered in this embodiment typically covers 200mm to 1200mm and above, to encompass mainstream large-diameter generator circuit breakers.

[0067] Material property definition: Define the electrical conductivity of the conductor material, typically the nominal conductivity of pure aluminum or aluminum alloys. The contact resistance of the contact area must also be considered, and can be set based on empirical data or experimental values.

[0068] Boundary conditions and excitation settings: Set the electrical boundary conditions of the model. Apply a constant current source excitation (e.g., DC 1000A) at the current injection point and define the corresponding return point to form a complete simulation loop.

[0069] Step 2: Systematic analysis of single-point measurement simulation:

[0070] 1) First, a single-point current injection simulation is performed. A constant current is injected at the preset measurement point in the model, and the theoretical value of the loop resistance and the simulation value of the single-point measurement are calculated by the finite element software solver.

[0071] 2) Calculation of the error between simulated and theoretical values:

[0072] Calculate the simulated value of the loop resistance R sim Compared with the theoretical value R theory Error:

[0073] Error = ×100%

[0074] The simulated value of the loop resistance is calculated based on the formula for parallel equivalent resistance, as follows:

[0075] 1 / R sim =1 / R1+1 / R2+…1 / R i

[0076] In the formula, R sim Represents the simulated value of the loop resistance; R i The value represents the resistance at each measurement point; i represents the number of measurement points, which is a positive integer.

[0077] 3) Judgment and Decision: Set an acceptable error threshold for the project. In this embodiment, a preliminary threshold of 20% is recommended. This threshold can be adjusted according to the stringency of specific project requirements. If the calculation error is ≤20%, it is considered that for a conductor of this outer diameter, single-point current injection measurement of its loop resistance has sufficient accuracy, the scheme is feasible, and there is no need to add measurement points. If the calculation error is >20%, it indicates that the single-point measurement deviation is too large, and the result is unreliable. In this case, add a current injection point. The newly added injection point should be symmetrical or reasonably distributed on the conductor cross-section with respect to the initial point to ensure the uniformity of current distribution.

[0078] 4) Iterative simulation: On the model with added measurement points (e.g., two-point injection, with current evenly distributed), the loop resistance simulation calculation is performed again, and the error between the new simulation value and the theoretical value is calculated again.

[0079] 5) Loop Termination: Repeat the process of "error judgment - adding measurement points - resimulation" until the loop resistance error calculated by simulation is less than or equal to 20%. The number of measurement points at this point is the minimum number of measurement points required for this specific outer diameter conductor under this error requirement.

[0080] Step 3: Establish a universal relationship table between outer diameter and minimum number of measurement points:

[0081] 1) Repeat the complete iterative optimization analysis process of step (2) above for a series of generator circuit breaker conductive rods with different outer diameters (e.g., starting from 200mm, with intervals of 50mm or 100mm, up to 1200mm).

[0082] 2) Data recording and organization: For each outer diameter dimension, record the minimum number of measurement points required to finally meet the error requirement (≤20%).

[0083] 3) Relationship table construction: Compile the correspondence between all "circuit breaker outer diameters" and "corresponding minimum number of measurement points" into a table to form a clear and concise "generator circuit breaker circuit resistance minimum number of measurement points - outer diameter relationship comparison table" to obtain a universal relationship table between outer diameter and minimum number of measurement points.

[0084] The above relationship table can be directly applied to actual engineering measurements, avoiding accuracy problems caused by insufficient measurement points, reducing the waste of manpower and time caused by over-measurement, and significantly improving the scientific nature and efficiency of measurement work.

[0085] like Figure 4As shown, this embodiment also provides a measurement point optimization system for measuring the circuit resistance of a generator circuit breaker, including: a model building module for building a three-dimensional finite element model based on the actual dimensions of the generator circuit breaker; a simulation module for performing single-point current injection simulation on the three-dimensional finite element model and calculating the error between the simulated and theoretical values ​​of the circuit resistance; a measurement point addition module for executing the measurement point addition process; the measurement point addition process: if the error between the simulated and theoretical values ​​of the circuit resistance exceeds a preset threshold range, a measurement point is added on the circumference of the generator circuit breaker in the three-dimensional finite element model, and the newly added measurement point is on the same circumference as the original measurement point, making all measurement points equally distributed; a calculation module for executing the error calculation process; the error calculation process: performing current injection simulation on the three-dimensional finite element model and recalculating the error between the simulated and theoretical values ​​of the circuit resistance; an iteration module for executing a loop process; the loop process: repeatedly executing the measurement point addition process and the error calculation process until the error between the simulated and theoretical values ​​of the circuit resistance meets the preset threshold range, and outputting the final number of measurement points.

[0086] The present invention also provides a measurement point optimization device for measuring the circuit resistance of a generator circuit breaker, comprising: a memory for storing a computer program; and a processor for executing the computer program to implement the steps of the measurement point optimization method for measuring the circuit resistance of a generator circuit breaker.

[0087] The present invention also provides a computer program product, including a computer program / instructions that, when executed by a processor, implement the steps of the method for optimizing measurement points for measuring the circuit resistance of a generator circuit breaker.

[0088] When the processor executes the computer program, it implements the steps of optimizing the measurement points for measuring the circuit resistance of the generator circuit breaker, for example: constructing a three-dimensional finite element model based on the actual size of the generator circuit breaker; performing a single-point current injection simulation on the three-dimensional finite element model to calculate the error between the simulated and theoretical values ​​of the circuit resistance; measurement point addition process: if the error between the simulated and theoretical values ​​of the circuit resistance exceeds a preset threshold range, a measurement point is added on the circumference of the generator circuit breaker in the three-dimensional finite element model, and the newly added measurement point is on the same circumference as the original measurement point, making all measurement points equally spaced; error calculation process: performing a current injection simulation on the three-dimensional finite element model and recalculating the error between the simulated and theoretical values ​​of the circuit resistance; loop process: repeatedly executing the measurement point addition process and the error calculation process until the error between the simulated and theoretical values ​​of the circuit resistance meets the preset threshold range, and outputting the final number of measurement points.

[0089] For example, the computer program may be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the present invention. The one or more modules / units may be a series of computer program instruction segments capable of performing preset functions, wherein the instruction segments describe the execution process of the computer program in the generator circuit breaker loop resistance measurement point optimization device. For example, the computer program can be divided into a model building module, a simulation module, a measurement point addition module, a calculation module, and an iteration module. The model building module is used to build a three-dimensional finite element model based on the actual dimensions of the generator circuit breaker. The simulation module is used to perform single-point current injection simulation on the three-dimensional finite element model and calculate the error between the simulated and theoretical values ​​of the loop resistance. The measurement point addition module is used to execute the measurement point addition process. In this process, if the error between the simulated and theoretical values ​​of the loop resistance exceeds a preset threshold range, a measurement point is added to the circumference of the generator circuit breaker in the three-dimensional finite element model. The newly added measurement point is on the same circumference as the original measurement point, and all measurement points are equidistantly distributed. The calculation module is used to execute the error calculation process. This process involves performing current injection simulation on the three-dimensional finite element model and recalculating the error between the simulated and theoretical values ​​of the loop resistance. The iteration module is used to execute a loop process. This loop process repeats the measurement point addition process and the error calculation process until the error between the simulated and theoretical values ​​of the loop resistance meets the preset threshold range, and then outputs the final number of measurement points.

[0090] The device for optimizing measurement points for measuring the circuit resistance of a generator circuit breaker can be a desktop computer, laptop, handheld computer, or cloud server, etc. This device may include, but is not limited to, a processor and memory. Those skilled in the art will understand that the above are examples of devices for optimizing measurement points for measuring the circuit resistance of a generator circuit breaker and do not constitute a limitation on such devices. The device may include more components than described above, or combine certain components, or use different components. For example, the device may also include input / output devices, network access devices, buses, etc.

[0091] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor, or any conventional processor. This processor is the control center for optimizing the measurement points of the generator circuit breaker loop resistance measurement, and it connects various parts of the entire generator circuit breaker loop resistance measurement optimization equipment via various interfaces and lines.

[0092] The memory can be used to store the computer program and / or modules. The processor implements various functions of the generator circuit breaker loop resistance measurement point optimization device by running or executing the computer program and / or modules stored in the memory and calling the data stored in the memory.

[0093] The memory may primarily include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a function (such as sound playback, image playback, etc.). The data storage area may store data created based on the use of the mobile phone (such as audio data, phonebook, etc.). Furthermore, the memory may include high-speed random access memory and non-volatile memory, such as hard disks, RAM, plug-in hard disks, smart media cards (SMC), secure digital cards (SD cards), flash cards, at least one disk storage device, flash memory device, or other volatile solid-state storage devices.

[0094] The present invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method for optimizing measurement points for measuring the circuit resistance of a generator circuit breaker.

[0095] If the module / unit of the generator circuit breaker circuit resistance measurement optimization system is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.

[0096] Based on this understanding, the present invention can implement all or part of the process in the above-mentioned method for optimizing measurement points for measuring the circuit resistance of a generator circuit breaker. This can also be accomplished by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the steps of the above-mentioned method for optimizing measurement points for measuring the circuit resistance of a generator circuit breaker. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or a preset intermediate form, etc.

[0097] The computer-readable storage medium may include: any entity or device capable of carrying the computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc.

[0098] It should be noted that the content contained in the computer-readable storage medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable storage medium does not include electrical carrier signals and telecommunication signals.

[0099] In summary, this invention provides a method and related apparatus for optimizing measurement points in generator circuit breaker circuit resistance measurement, which has the following advantages compared to existing measurement methods:

[0100] First, the accuracy is controllable: the error is controlled within the set range through simulation iteration to ensure the reliability of the measurement results;

[0101] Second, it has wide applicability: it is suitable for circuit breakers of different outer diameters and has good engineering adaptability;

[0102] Third, it provides strong guidance: it offers a clear reference for the number of measurement points, avoiding the uncertainty of selecting the number of measurement points based on experience;

[0103] Fourth, cost savings: While ensuring accuracy, avoid unnecessary excessive measurement points and save testing resources.

[0104] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for optimizing measurement points in generator circuit breaker circuit resistance measurement, characterized in that, include: A three-dimensional finite element model was constructed based on the actual dimensions of the generator circuit breaker. A single-point current injection simulation was performed using a three-dimensional finite element model to calculate the error between the simulated and theoretical values ​​of the loop resistance. Measurement point addition process: If the error between the simulated value and the theoretical value of the loop resistance exceeds the preset threshold range, a measurement point is added on the circumference of the generator circuit breaker in the three-dimensional finite element model. The newly added measurement point is on the same circumference as the original measurement point and all measurement points are equidistantly distributed. Error calculation process: The three-dimensional finite element model is subjected to current injection simulation and the error between the simulated value and the theoretical value of the loop resistance is recalculated; Loop process: Repeat the process of adding measurement points and calculating errors until the error between the simulated value and the theoretical value of the loop resistance meets the preset threshold range, and output the final number of measurement points.

2. The method for optimizing measurement points for measuring the circuit resistance of a generator circuit breaker according to claim 1, characterized in that, The actual dimensions of the generator circuit breaker include the outer diameter of the generator circuit breaker; Following the cyclic process, the following is also included: The outer diameter of the generator circuit breaker was changed, the three-dimensional finite element model was reconstructed, and the single-point current injection simulation, measurement point addition process, error calculation process and error calculation process were re-executed; Obtain the final number of measurement points corresponding to the outer diameter of multiple sets of different generator circuit breakers; Based on the number of final measurement points corresponding to the outer diameter of multiple sets of different generator circuit breakers, a universal relationship table between outer diameter and minimum number of measurement points is established to guide the actual measurement of the circuit resistance of generator circuit breakers in practice.

3. The method for optimizing measurement points for measuring the circuit resistance of a generator circuit breaker according to claim 2, characterized in that, The change of the outer diameter of the generator circuit breaker includes: For generator circuit breakers of the same series, the outer diameter of the generator circuit breaker is continuously changed at preset intervals until the outer diameter reaches the maximum.

4. The method for optimizing measurement points for measuring the circuit resistance of a generator circuit breaker according to claim 1, characterized in that, After performing single-point current injection simulation on the three-dimensional finite element model and calculating the error between the simulated and theoretical values ​​of the loop resistance, the method further includes: If the error between the simulated value and the theoretical value of the loop resistance meets the preset threshold range, the final number of measurement points will be 1, which indicates that the optimal measurement point corresponding to the outer diameter of the current generator circuit breaker is 1.

5. The method for optimizing measurement points for measuring the circuit resistance of a generator circuit breaker according to claim 1, characterized in that, In the process of performing single-point current injection simulation on the three-dimensional finite element model and calculating the error between the simulated and theoretical values ​​of the loop resistance, the simulated value of the loop resistance is calculated based on Ohm's law. The specific formula for calculating the error between the simulated and theoretical values ​​of the loop resistance is as follows: Error = ×100% In the formula, R sim Represents the simulated value of the loop resistance; R theory This represents the theoretical value of the loop resistance.

6. The method for optimizing measurement points for measuring the circuit resistance of a generator circuit breaker according to claim 1, characterized in that, During the process of adding the measurement points, the simulated value of the loop resistance is calculated based on the formula for parallel equivalent resistance, as follows: 1 / R sim =1 / R1+1 / R2+…1 / R i In the formula, R sim Represents the simulated value of the loop resistance; R i The value represents the resistance at each measurement point; i represents the number of measurement points, which is a positive integer.

7. The method for optimizing measurement points for measuring the circuit resistance of a generator circuit breaker according to claim 1, characterized in that, The construction of a three-dimensional finite element model based on the actual dimensions of the generator circuit breaker includes: Collect key geometric parameters of the conductive circuit of the generator circuit breaker; the key geometric parameters include: the outer diameter, wall thickness and total length of the generator circuit breaker, as well as the structural dimensions of key connection parts; Initialize the conductivity, electrical boundary conditions, and current source excitation of the conductor material, and define the corresponding return points to form a complete simulation loop; A three-dimensional finite element model was constructed based on the key geometric parameters of the generator circuit breaker's conductive circuit, the conductivity of the conductor material, the electrical boundary conditions, and the current source excitation.

8. A measurement point optimization system for measuring the circuit resistance of a generator circuit breaker, characterized in that, include: The model building module is used to construct a three-dimensional finite element model based on the actual dimensions of the generator circuit breaker. The simulation module is used to perform single-point current injection simulation on a three-dimensional finite element model and calculate the error between the simulated and theoretical values ​​of the loop resistance. The measurement point addition module is used to execute the measurement point addition process; the measurement point addition process is as follows: if the error between the simulated value and the theoretical value of the loop resistance exceeds the preset threshold range, a measurement point is added on the circumference of the generator circuit breaker in the three-dimensional finite element model. The newly added measurement point is on the same circumference as the original measurement point and all measurement points are equidistantly distributed. The calculation module is used to perform the error calculation process; the error calculation process involves performing current injection simulation on the three-dimensional finite element model and recalculating the error between the simulated value and the theoretical value of the loop resistance. The iterative module is used to execute the loop process; the loop process is to repeatedly execute the measurement point addition process and the error calculation process until the error between the simulated value and the theoretical value of the loop resistance meets the preset threshold range, and then output the final number of measurement points.

9. A measurement point optimization device for measuring the circuit resistance of a generator circuit breaker, characterized in that, include: Memory, used to store computer programs; A processor, configured to execute the computer program to implement the steps of the method for optimizing measurement points for measuring the circuit resistance of a generator circuit breaker as described in any one of claims 1-7.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it is used to implement the steps of the method for optimizing measurement points for measuring the circuit resistance of a generator circuit breaker as described in any one of claims 1-7.

Images