A maintenance decision-making method, device, terminal equipment, and storage medium for a high-voltage circuit breaker.

Abstract

This invention discloses a maintenance decision-making method, apparatus, terminal equipment, and storage medium for high-voltage circuit breakers. Based on the maximum breaking count and fault current of several high-voltage circuit breakers, the safety availability margin of the circuit breakers is assessed, and then the probability of wear-free failure in the future is determined. Further, based on the performance information parameters of the high-voltage circuit breakers, the probability of no initial failure and the probability of no sudden failure are determined. Finally, the failure-free probability of each high-voltage circuit breaker in each future time period is evaluated, thereby determining several target high-voltage circuit breakers that need maintenance in each future time period and generating corresponding circuit breaker maintenance strategies. Therefore, this invention screens the target high-voltage circuit breakers that need maintenance in each time period by evaluating the failure-free probability of each high-voltage circuit breaker in each future time period, eliminating the need for inspection and maintenance of high-voltage circuit breakers with no failure risk, effectively improving the maintenance efficiency of high-voltage circuit breakers.

Description

Technical Field

[0001] This invention relates to the field of gas-insulated combined electrical equipment technology, and in particular to a maintenance decision-making method, device, terminal equipment and storage medium for a high-voltage circuit breaker. Background Technology

[0002] High-voltage circuit breakers, as indispensable components of power systems, bear the crucial responsibility of preventing faults in transmission lines, transformers, and various equipment within substations. By the end of the 20th century, significant advancements in high-voltage switchgear technology had led to the gradual replacement of traditional oil-insulated and air-insulated circuit breakers with vacuum-insulated and SF6 gas-insulated circuit breakers. These newer circuit breakers better meet the demands of compact designs, significantly reducing maintenance cycles and extending service life. SF6 gas exhibits superior arc-extinguishing characteristics; specifically, its arc extinguishing speed is nearly 100 times faster than that of air. Replacing high-voltage oil and air circuit breakers with SF6 gas circuit breakers not only improves system reliability but also effectively reduces operating costs, bringing positive economic benefits. Accordingly, the correct, efficient, and reasonable maintenance of high-voltage SF6 circuit breakers to ensure they reach their expected average service life and maintain the overall stability of the power system is of paramount importance.

[0003] Currently, the maintenance of circuit breaker equipment is mainly carried out through planned power outages. However, due to the large number of circuit breakers, the workload of maintaining all of them is enormous, the maintenance efficiency is low, and the required power outage time is long, which seriously affects users' normal power supply. Summary of the Invention

[0004] This invention provides a maintenance decision-making method, apparatus, terminal equipment, and storage medium for high-voltage circuit breakers. By assessing the failure-free probability of each high-voltage circuit breaker in each future time period, a circuit breaker maintenance strategy is formulated, effectively improving the maintenance efficiency of high-voltage circuit breakers.

[0005] An embodiment of the present invention provides a maintenance decision-making method for high-voltage circuit breakers, comprising:

[0006] The system acquires performance information parameters, maximum number of interruptions, and fault current of several high-voltage circuit breakers in the power system under each historical interruption state.

[0007] The maximum number of interruptions and the fault current are input into a preset wear-free fault probability model so that the wear-free fault probability model outputs the wear-free fault probability of each of the high-voltage circuit breakers in each future time period; wherein, the wear-free fault probability model is a mathematical model that evaluates the safety availability margin of the high-voltage circuit breaker based on the maximum number of interruptions and the fault current experienced by the high-voltage circuit breaker, and then determines the wear-free fault probability of the high-voltage circuit breaker in the future based on the safety availability margin.

[0008] Based on the performance information parameters of each high-voltage circuit breaker, determine the probability of no initial fault for each high-voltage circuit breaker and the probability of no sudden fault for each high-voltage circuit breaker in each future time period; wherein, the probability of no initial fault is the probability that the high-voltage circuit breaker will not fail during the initial interruption; the probability of no sudden fault is the probability that the high-voltage circuit breaker will not fail due to the sudden failure of a key component.

[0009] Based on the probability of no wear failure, the probability of no sudden failure, and the probability of no initial failure, the probability of no failure of the high-voltage circuit breaker in each future time period is determined.

[0010] Based on the fault-free probability, determine the target high-voltage circuit breakers that need to be maintained in each future time period, and generate the corresponding circuit breaker maintenance strategy.

[0011] Furthermore, the wear-free failure probability model outputs the wear-free failure probability of each of the high-voltage circuit breakers in each future time period, including:

[0012] Based on the maximum number of breaking operations of each high-voltage circuit breaker, the number of breaking operations and the safety margin of each high-voltage circuit breaker under several preset operating conditions are determined, and a time variable of the safety margin of several operating conditions is constructed with respect to time; wherein, the operating conditions include: a first operating condition, a second operating condition, and a third operating condition; the first operating condition is when the fault current is less than a first threshold, the second operating condition is when the fault current is between the first threshold and the second threshold, and the third operating condition is when the fault current is greater than the second threshold, the first threshold is less than the second threshold, and the second threshold is less than the third threshold;

[0013] Based on the fault current, the number of interruptions, and the safety margin, the probability of an initial wear-free fault in which each of the high-voltage circuit breakers will not fail due to wear of the arc-extinguishing device under each operating condition is confirmed.

[0014] Based on the number of interruptions, the initial wear-free failure probability, and the time variable, the wear-free failure probability of each high-voltage circuit breaker in each future time period is determined.

[0015] Furthermore, the wear-free failure probability model is as follows:

[0016]

[0017] Where P2(t) is the wear-free failure probability of the high-voltage circuit breaker in time period t, m is the first interruption count of the high-voltage circuit breaker under the first operating condition, p is the second interruption count of the high-voltage circuit breaker under the second operating condition, k is the third interruption count of the high-voltage circuit breaker under the third operating condition, and A m Let A be the initial wear-free failure probability of the high-voltage circuit breaker under the first operating condition. p Let A be the second initial wear-free fault probability of the high-voltage circuit breaker under the second operating condition. k Let a1 be the first time variable of the first safety margin with respect to time, a2 be the second time variable of the second safety margin with respect to time, and a3 be the third time variable of the third safety margin with respect to time.

[0018] Furthermore, the performance information parameters include: the model of the high-voltage circuit breaker;

[0019] Based on the performance information parameters of each high-voltage circuit breaker, determine the probability of no initial fault for each high-voltage circuit breaker, including:

[0020] Based on the model of each high-voltage circuit breaker, determine the number of initial faults that occurred during the breaking test for each model of high-voltage circuit breaker;

[0021] Calculate the difference between the number of initial failures and the total number of interruption tests, and use the ratio of the difference to the total number of interruption tests as the probability of no initial failure.

[0022] Furthermore, the performance information parameters include: performance parameters of key components in the high-voltage circuit breaker;

[0023] Based on the performance information parameters of each high-voltage circuit breaker, determine the probability of no sudden failure for each high-voltage circuit breaker in each future time period, including:

[0024] The probability of no sudden failure for the high-voltage circuit breaker in each future time period is calculated using the following formula, based on the performance parameters:

[0025]

[0026] Where P1(t) is the probability of no sudden failure of the high-voltage circuit breaker during time period t, and λ0 is the performance parameter.

[0027] Furthermore, determining the fault-free probability of the high-voltage circuit breaker in each future time period based on the probability of no wear failure, the probability of no sudden failure, and the probability of no initial failure includes:

[0028] The failure-free probability of the high-voltage circuit breaker in each future time period is determined according to the following formula:

[0029] P(t) = P0P1(t)P2(t);

[0030] Wherein, P(t) is the probability of no fault in the high-voltage circuit breaker during time period t, P0 is the probability of no initial fault in the high-voltage circuit breaker, P1(t) is the probability of no sudden fault in the high-voltage circuit breaker during time period t, and P2(t) is the probability of no wear fault in the high-voltage circuit breaker during time period t.

[0031] Furthermore, based on the fault-free probability, the step of determining several target high-voltage circuit breakers requiring maintenance in each future time period and generating corresponding circuit breaker maintenance strategies includes:

[0032] Obtain the preset fault-free probability threshold;

[0033] Based on the fault-free probability threshold, the target fault-free probability less than the fault-free probability threshold in each time period is determined, as well as the target high-voltage circuit breaker corresponding to each target fault-free probability.

[0034] Based on the probability of no faults of several targets in each time period, the target high-voltage circuit breakers are sorted from smallest to largest to determine the maintenance priority of the target high-voltage circuit breakers.

[0035] Based on the maintenance priority of the target high-voltage circuit breaker, a circuit breaker maintenance strategy is generated for each time period.

[0036] Another embodiment of the present invention provides a maintenance decision device for a high-voltage circuit breaker, comprising:

[0037] The data acquisition module is used to acquire performance information parameters, maximum number of interruptions, and fault current of several high-voltage circuit breakers in the power system under each historical interruption state.

[0038] The first fault-free probability module is used to input the maximum number of interruptions and the fault current into a preset wear-free fault probability model, so that the wear-free fault probability model outputs the wear-free fault probability of each of the high-voltage circuit breakers in each future time period; wherein, the wear-free fault probability model is a mathematical model that evaluates the safety availability margin of the high-voltage circuit breaker based on the maximum number of interruptions and the fault current experienced by the high-voltage circuit breaker, and then determines the wear-free fault probability of the high-voltage circuit breaker in the future based on the safety availability margin;

[0039] The second fault-free probability module is used to determine the probability of no initial fault for each high-voltage circuit breaker and the probability of no sudden fault for each high-voltage circuit breaker in each future time period based on the performance information parameters of each high-voltage circuit breaker; wherein, the probability of no initial fault is the probability that the high-voltage circuit breaker will not fail during the initial interruption; the probability of no sudden fault is the probability that the high-voltage circuit breaker will not fail due to the sudden failure of a key component.

[0040] The fault-free probability calculation module is used to determine the fault-free probability of the high-voltage circuit breaker in each future time period based on the wear-free fault probability, the sudden fault probability, and the initial fault probability.

[0041] A maintenance strategy generation module is used to determine, based on the fault-free probability, several target high-voltage circuit breakers requiring maintenance in each future time period, and generate corresponding circuit breaker maintenance strategies. Another embodiment of the present invention provides a terminal device including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements a high-voltage circuit breaker maintenance decision-making method as described in any of the above embodiments.

[0042] Another embodiment of the present invention provides a storage medium including a stored computer program, wherein, when the computer program is executed, it controls the device where the storage medium is located to perform a maintenance decision method for a high-voltage circuit breaker as described in any of the above embodiments.

[0043] The following benefits can be obtained by implementing the present invention:

[0044] This invention discloses a maintenance decision-making method, apparatus, terminal equipment, and storage medium for high-voltage circuit breakers. The method, based on consideration of the limited service life of high-voltage circuit breakers, assesses the future safety margin of several high-voltage circuit breakers based on their maximum breaking count and fault current under each historical breaking state. This determines the probability of wear-free failure in the future, and further, based on the performance parameters of the high-voltage circuit breakers, determines the probability of no initial failure (no failure during initial breaking) and the probability of no sudden failure (no failure due to sudden failure of critical components) in any future time period. Finally, it assesses the failure-free probability of each high-voltage circuit breaker in each future time period, thereby determining several target high-voltage circuit breakers requiring maintenance in each future time period and generating corresponding circuit breaker maintenance strategies. Therefore, this invention effectively improves the maintenance efficiency of high-voltage circuit breakers by evaluating the failure-free probability of each high-voltage circuit breaker in each future time period, without requiring maintenance of high-voltage circuit breakers without fault risk. Attached Figure Description

[0045] Figure 1 This is a flowchart illustrating a maintenance decision-making method for a high-voltage circuit breaker according to an embodiment of the present invention.

[0046] Figure 2 This is a schematic diagram of the structure of a maintenance decision device for a high-voltage circuit breaker provided in an embodiment of the present invention.

[0047] Figure 3 This is a schematic diagram of different fault current magnitudes on a single line according to an embodiment of the present invention.

[0048] Figure 4 This is a schematic diagram of a mathematical model relating the magnitude of the fault current to the safety margin, provided in an embodiment of the present invention. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0051] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0052] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0053] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0054] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0055] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0056] See Figure 1 This is a flowchart illustrating a maintenance decision-making method for a high-voltage circuit breaker according to an embodiment of the present invention, including:

[0057] S1. Obtain the performance information parameters, maximum number of interruptions, and fault current of several high-voltage circuit breakers in the power system under each historical interruption state.

[0058] S2. Input the maximum number of interruptions and the fault current into a preset wear-free fault probability model, so that the wear-free fault probability model outputs the wear-free fault probability of each of the high-voltage circuit breakers in each future time period; wherein, the wear-free fault probability model is a mathematical model that evaluates the safety availability margin of the high-voltage circuit breaker based on the maximum number of interruptions and the fault current experienced by the high-voltage circuit breaker, and then determines the wear-free fault probability of the high-voltage circuit breaker in the future based on the safety availability margin;

[0059] Preferably, the wear-free failure probability model outputs the wear-free failure probability of each of the high-voltage circuit breakers in each future time period, including:

[0060] S21. Based on the maximum number of interruptions of each high-voltage circuit breaker, determine the number of interruptions and the safety margin of each high-voltage circuit breaker under several preset operating conditions, and construct a time variable of the safety margin of several operating conditions with respect to time; wherein, the operating conditions include: a first operating condition, a second operating condition, and a third operating condition; the first operating condition is when the fault current is less than a first threshold, the second operating condition is when the fault current is between the first threshold and the second threshold, and the third operating condition is when the fault current is greater than the second threshold, the first threshold is less than the second threshold, and the second threshold is less than the third threshold;

[0061] S22. Based on the fault current, the number of interruptions, and the safety margin, confirm the initial wear-free fault probability that each of the high-voltage circuit breakers will not fail due to arc extinguishing device wear under each operating condition.

[0062] S23. Determine the probability of wear-free failure for each of the high-voltage circuit breakers in each future time period based on the number of interruptions, the initial probability of wear-free failure, and the time variable.

[0063] Preferably, the wear-free failure probability model is:

[0064]

[0065] Where P2(t) is the wear-free failure probability of the high-voltage circuit breaker in time period t, m is the first interruption count of the high-voltage circuit breaker under the first operating condition, p is the second interruption count of the high-voltage circuit breaker under the second operating condition, k is the third interruption count of the high-voltage circuit breaker under the third operating condition, and A m Let A be the initial wear-free failure probability of the high-voltage circuit breaker under the first operating condition. p Let A be the second initial wear-free fault probability of the high-voltage circuit breaker under the second operating condition. k Let a1 be the first time variable of the first safety margin with respect to time, a2 be the second time variable of the second safety margin with respect to time, and a3 be the third time variable of the third safety margin with respect to time.

[0066] In a preferred embodiment of the present invention, for circuit breaker devices with different qualities and varying times of commissioning, the concept of "safety availability margin" is proposed and represented by N, E N E N-1 E N-2...this indicates the circuit breaker states with different lifespan margins. A mathematical probability model is constructed to obtain the equation for the wear-free fault probability P2 with respect to t. The short-circuit current and fault probability are quantified into mathematical expressions related to time t, the number of interruption statistics, and data from the product manual, thereby estimating the fault-free probability of a specific circuit breaker.

[0067] For the safety margin N, the larger N is, the less likely the circuit breaker is to fail; the larger the fault current intensity is, the greater the fault current intensity is, and the more severe the damage to the circuit breaker is. Figure 3 The image shows the magnitude of the short-circuit current at different fault points on a single line. The magnitude of the different fault currents is the most intuitive data characterizing the strength of the fault current. Figure 4 This is a simplified diagram of a mathematical model established based on the above description, for example, a safety availability margin of E. N The circuit breaker, after experiencing a fault current, has a safety margin of E. N-1 When N decreases to 0, it indicates that the circuit breaker has experienced a fault.

[0068] Understandably, the probability of failure due to wear of the causeless arc-extinguishing device is usually a major influencing factor on the failure-free probability of high-voltage circuit breakers. Therefore, further analysis and the establishment of a more detailed mathematical statistical model are necessary. After comprehensive consideration and analysis, it is believed that... in Let Pi be the three-phase short-circuit current when a fault occurs at point Ki. In actual line operation, the probability P2(t) of a fault due to wear of the arc-extinguishing device can be considered as being determined by Ei. N The sum of probabilities of transitioning from state E1:

[0069]

[0070] If N is the initial resource, then each i-th state is characterized by the remainder of resource i and the used resource N–i. The differential equation for the probability of this state is:

[0071]

[0072] Based on the two sets of equations above, P2(t) for evaluating a certain series of high-voltage SF6 circuit breakers can be determined. The specific calculation formula is as follows:

[0073]

[0074] In the formula, a1=λ1t, a2=λ2t, a3=λ3t, A k = (n-1) / λ3,A p = (n-1-λ3k) / λ2,

[0075] A m= (n-1-λ3k-λ2p) / λ1. m represents the number of interruptions under the operating condition corresponding to λ1, p represents the number of interruptions under the operating condition corresponding to λ2, and k represents the number of interruptions under the operating condition corresponding to λ3. This pattern continues for cases where the fault intensity is greater than 3. n is the "remaining safety margin" of a circuit breaker (e.g., the circuit breaker under test) under this lifespan condition. The remaining resource amount n after the circuit breaker completes a number of interruptions under different operating conditions is determined by the formula n = N - (λ1m + λ2p + λ3k).

[0076] Let's take an example to illustrate λ i The method for determining the maximum breaking short-circuit current for the BT-110 series SF6 circuit breaker, according to the product manual, is as follows: [The method is missing from the original text]. Setting N=50, the three-phase fault short-circuit current If the breaking life under operating conditions is 50 cycles, then λ1 is 50 / 50 = 1; In the three-phase fault short-circuit current... If the breaking life under operating conditions is 28 cycles, then λ2 is 50 / 28 = 1.4; In the three-phase fault short-circuit current... If the breaking life under operating conditions is 20 cycles, then λ1 is 50 / 20 = 2.5. Furthermore, the fault current intensity differs between poorly protected and well-protected lines in actual power systems, and can be adjusted based on actual conditions and human experience.

[0077] S3. Based on the performance information parameters of each high-voltage circuit breaker, determine the probability of no initial fault for each high-voltage circuit breaker and the probability of no sudden fault for each high-voltage circuit breaker in each future time period; wherein, the probability of no initial fault is the probability that the high-voltage circuit breaker will not fail during the initial interruption; the probability of no sudden fault is the probability that the high-voltage circuit breaker will not fail due to the sudden failure of key components.

[0078] Preferably, the performance information parameters include: the model of the high-voltage circuit breaker;

[0079] Based on the performance information parameters of each high-voltage circuit breaker, determine the probability of no initial fault for each high-voltage circuit breaker, including:

[0080] S31. Based on the model of each high-voltage circuit breaker, determine the number of initial faults that occur during the breaking test for each model of high-voltage circuit breaker.

[0081] S32. Calculate the difference between the number of initial failures and the total number of interruption tests, and use the ratio of the difference to the total number of interruption tests as the probability of no initial failure.

[0082] In a preferred embodiment of the present invention, P0 represents the probability of no sudden failure. According to statistical data, when breaking tests are conducted on products of the same type, the ratio of the number of events with no initial failure probability to the total number of tests is a constant close to 1, which is denoted as P0. Specifically, P0 is determined by long-term statistical data of protection devices of the same type, and is generally taken as 0.994-0.999.

[0083] Preferably, the performance information parameters include: performance parameters of key components in the high-voltage circuit breaker;

[0084] Based on the performance information parameters of each high-voltage circuit breaker, determine the probability of no sudden failure for each high-voltage circuit breaker in each future time period, including:

[0085] S33. Calculate the probability of no sudden failure for the high-voltage circuit breaker in each future time period using the following formula, based on the performance parameters:

[0086]

[0087] Where P1(t) is the probability of no sudden failure of the high-voltage circuit breaker during time period t, and λ0 is the performance parameter.

[0088] In a preferred embodiment of the present invention, P1(t) represents the probability of no sudden failure, exhibiting an absolutely continuous distribution, i.e., the time between two consecutive ends simulating the same event; P1(t) is a function that changes with time, thus decreasing with the time of commissioning. According to the principle of statistical probability distribution, its function graph is assumed to follow an absolutely continuous distribution: For λ0 in the above formula, a very small real number is usually selected based on the performance of the circuit breaker, such as the strength of the contact material's resistance to ablation and the breaking voltage level (0.02 for CuW80 material breaking 126kV, adjusted accordingly based on actual conditions). It can be seen that P0 and P1 have little impact on the fault-free probability, which mainly considers the faults caused by wear due to arcing erosion in the high-voltage circuit breaker.

[0089] S4. Based on the probability of no wear failure, the probability of no sudden failure, and the probability of no initial failure, determine the probability of no failure of the high-voltage circuit breaker in each future time period.

[0090] Preferably, determining the fault-free probability of the high-voltage circuit breaker in each future time period based on the probability of no wear failure, the probability of no sudden failure, and the probability of no initial failure includes:

[0091] S41. Determine the fault-free probability of the high-voltage circuit breaker in each future time period according to the following formula:

[0092] P(t) = P0P1(t)P2(t);

[0093] Wherein, P(t) is the probability of no fault in the high-voltage circuit breaker during time period t, P0 is the probability of no initial fault in the high-voltage circuit breaker, P1(t) is the probability of no sudden fault in the high-voltage circuit breaker during time period t, and P2(t) is the probability of no wear fault in the high-voltage circuit breaker during time period t.

[0094] S5. Based on the fault-free probability, determine the target high-voltage circuit breakers that need to be maintained in each future time period, and generate the corresponding circuit breaker maintenance strategy.

[0095] Preferably, the step of determining, based on the fault-free probability, a number of target high-voltage circuit breakers requiring maintenance in each future time period, and generating corresponding circuit breaker maintenance strategies, includes:

[0096] S51. Obtain the preset fault-free probability threshold;

[0097] S52. Based on the fault-free probability threshold, determine the target fault-free probability that is less than the fault-free probability threshold in each time period, and the target high-voltage circuit breaker corresponding to each target fault-free probability.

[0098] S53. Based on the probability of no faults of several targets in each time period, sort the target high-voltage circuit breakers from smallest to largest to determine the maintenance priority of the target high-voltage circuit breakers.

[0099] S54. Generate a circuit breaker maintenance strategy for each time period based on the maintenance priority of the target high-voltage circuit breaker.

[0100] This embodiment provides a maintenance decision-making method for high-voltage circuit breakers. Considering the limited service life of high-voltage circuit breakers, it assesses the future safety margin of the circuit breakers based on the maximum number of breaking operations and the fault current under each historical breaking state. This determines the probability of wear-free failure in the future. Furthermore, based on the performance parameters of the circuit breakers, it determines the probability of no initial failure (no failure during initial breaking) and the probability of no sudden failure (no failure due to sudden failure of critical components in any future time period). Finally, it evaluates the failure-free probability of each circuit breaker in each future time period, thereby determining the target high-voltage circuit breakers requiring maintenance in each future time period and generating corresponding maintenance strategies. Therefore, this embodiment selects target high-voltage circuit breakers requiring maintenance in each time period by evaluating the failure-free probability of each circuit breaker in each future time period, eliminating the need for maintenance of circuit breakers without fault risk, effectively improving the maintenance efficiency of high-voltage circuit breakers.

[0101] See Figure 2This is a schematic diagram of the structure of a maintenance decision device for a high-voltage circuit breaker according to an embodiment of the present invention, comprising:

[0102] The data acquisition module is used to acquire performance information parameters, maximum number of interruptions, and fault current of several high-voltage circuit breakers in the power system under each historical interruption state.

[0103] The first fault-free probability module is used to input the maximum number of interruptions and the fault current into a preset wear-free fault probability model, so that the wear-free fault probability model outputs the wear-free fault probability of each of the high-voltage circuit breakers in each future time period; wherein, the wear-free fault probability model is a mathematical model that evaluates the safety availability margin of the high-voltage circuit breaker based on the maximum number of interruptions and the fault current experienced by the high-voltage circuit breaker, and then determines the wear-free fault probability of the high-voltage circuit breaker in the future based on the safety availability margin;

[0104] The second fault-free probability module is used to determine the probability of no initial fault for each high-voltage circuit breaker and the probability of no sudden fault for each high-voltage circuit breaker in each future time period based on the performance information parameters of each high-voltage circuit breaker; wherein, the probability of no initial fault is the probability that the high-voltage circuit breaker will not fail during the initial interruption; the probability of no sudden fault is the probability that the high-voltage circuit breaker will not fail due to the sudden failure of a key component.

[0105] The fault-free probability calculation module is used to determine the fault-free probability of the high-voltage circuit breaker in each future time period based on the wear-free fault probability, the sudden fault probability, and the initial fault probability.

[0106] The maintenance strategy generation module is used to determine, based on the fault-free probability, several target high-voltage circuit breakers that need to be maintained in each future time period, and generate corresponding circuit breaker maintenance strategies.

[0107] It should be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the accompanying drawings of the device embodiments provided by this invention, the connection relationships between modules indicate that they have communication connections, which can be specifically implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement this without any creative effort.

[0108] Those skilled in the art will clearly understand that, for convenience and brevity, the specific working process of the device described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0109] Another preferred embodiment of the present invention provides a terminal device including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to implement a maintenance decision method for a high-voltage circuit breaker as described in any of the foregoing embodiments.

[0110] The terminal device can be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0111] 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. A general-purpose processor can be a microprocessor or any conventional processor. The processor is the control center of the terminal device, connecting all parts of the terminal device via various interfaces and lines.

[0112] The memory can be used to store the computer program. The processor implements various functions of the terminal device by running or executing the computer program stored in the memory and calling data stored in the memory. The memory may mainly include a program storage area and a data storage area. The program storage area may store the operating system, at least one application program required for a function, etc.; the data storage area may store data created based on the use of the mobile phone, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as hard disk, RAM, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0113] Another preferred embodiment of the present invention provides a storage medium, which is a computer-readable storage medium. A computer program is stored in the computer-readable storage medium, and when executed by a processor, the computer program can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0114] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A maintenance decision-making method for high-voltage circuit breakers, characterized in that, include: The system acquires performance information parameters, maximum number of interruptions, and fault current of several high-voltage circuit breakers in the power system under each historical interruption state. The maximum number of interruptions and the fault current are input into a preset wear-free fault probability model so that the wear-free fault probability model outputs the wear-free fault probability of each of the high-voltage circuit breakers in each future time period; wherein, the wear-free fault probability model is a mathematical model that evaluates the safety availability margin of the high-voltage circuit breaker based on the maximum number of interruptions and the fault current experienced by the high-voltage circuit breaker, and then determines the wear-free fault probability of the high-voltage circuit breaker in the future based on the safety availability margin; Based on the performance information parameters of each high-voltage circuit breaker, determine the probability of no initial fault for each high-voltage circuit breaker and the probability of no sudden fault for each high-voltage circuit breaker in each future time period; wherein, the probability of no initial fault is the probability that the high-voltage circuit breaker will not fail during the initial interruption; the probability of no sudden fault is the probability that the high-voltage circuit breaker will not fail due to the sudden failure of a key component. Based on the probability of no wear failure, the probability of no sudden failure, and the probability of no initial failure, the probability of no failure of the high-voltage circuit breaker in each future time period is determined. Based on the fault-free probability, determine the target high-voltage circuit breakers that need to be maintained in each future time period, and generate the corresponding circuit breaker maintenance strategy. The wear-free failure probability model outputs the wear-free failure probability of each of the high-voltage circuit breakers in each future time period, including: Based on the maximum number of breaking operations of each high-voltage circuit breaker, the number of breaking operations and the safety margin of each high-voltage circuit breaker under several preset operating conditions are determined, and a time variable of the safety margin of several operating conditions is constructed with respect to time; wherein, the operating conditions include: a first operating condition, a second operating condition, and a third operating condition; the first operating condition is when the fault current is less than a first threshold, the second operating condition is when the fault current is between the first threshold and the second threshold, and the third operating condition is when the fault current is greater than the second threshold, the first threshold is less than the second threshold, and the second threshold is less than the third threshold; Based on the fault current, the number of interruptions, and the safety margin, determine the remaining number of interruptions for each high-voltage circuit breaker under each operating condition; Based on the number of interruptions, the remaining number of interruptions, and the time variable, the probability of wear-free failure for each of the high-voltage circuit breakers in each future time period is determined.

2. The maintenance decision-making method for a high-voltage circuit breaker as described in claim 1, characterized in that, The wear-free failure probability model is as follows: ； in, Let be the wear-free failure probability of the high-voltage circuit breaker during time period t, m be the first number of interruptions of the high-voltage circuit breaker under the first operating condition, p be the second number of interruptions of the high-voltage circuit breaker under the second operating condition, and k be the third number of interruptions of the high-voltage circuit breaker under the third operating condition. This represents the first remaining number of interruptions for the high-voltage circuit breaker under the first operating condition. This refers to the second remaining number of interruptions for the high-voltage circuit breaker under the second operating condition. This refers to the third remaining number of breaking operations for the high-voltage circuit breaker under the third operating condition. The first time variable representing the first safety margin. The second time variable represents the second safety margin available with respect to time. The third time variable is the third safety margin available with respect to time.

3. The maintenance decision-making method for a high-voltage circuit breaker as described in claim 2, characterized in that, The performance information parameters include: the model of the high-voltage circuit breaker; Based on the performance information parameters of each high-voltage circuit breaker, determine the probability of no initial fault for each high-voltage circuit breaker, including: Based on the model of each high-voltage circuit breaker, determine the number of initial faults that occurred during the breaking test for each model of high-voltage circuit breaker; Calculate the difference between the number of initial failures and the total number of interruption tests, and use the ratio of the difference to the total number of interruption tests as the probability of no initial failure.

4. The maintenance decision-making method for a high-voltage circuit breaker as described in claim 3, characterized in that, The performance information parameters include: performance parameters of key components in the high-voltage circuit breaker; Based on the performance information parameters of each high-voltage circuit breaker, determine the probability of no sudden failure for each high-voltage circuit breaker in each future time period, including: The probability of no sudden failure for the high-voltage circuit breaker in each future time period is calculated using the following formula, based on the performance parameters: ； Where P1(t) is the probability of no sudden failure of the high-voltage circuit breaker during time period t. The performance parameters are as described above.

5. The maintenance decision-making method for a high-voltage circuit breaker as described in claim 4, characterized in that, The determination of the fault-free probability of the high-voltage circuit breaker in each future time period based on the wear-free fault probability, the sudden fault probability, and the initial fault probability includes: The failure-free probability of the high-voltage circuit breaker in each future time period is determined according to the following formula: ； in, This represents the fault-free probability of a high-voltage circuit breaker during time period t. Let P1(t) be the probability of no initial fault for the high-voltage circuit breaker, and P1(t) be the probability of no sudden fault for the high-voltage circuit breaker during time period t. This represents the probability of a high-voltage circuit breaker experiencing a wear-free failure during time period t.

6. The maintenance decision-making method for a high-voltage circuit breaker as described in claim 5, characterized in that, Based on the fault-free probability, the process involves determining several target high-voltage circuit breakers requiring maintenance in each future time period and generating corresponding circuit breaker maintenance strategies, including: Obtain the preset fault-free probability threshold; Based on the fault-free probability threshold, the target fault-free probability less than the fault-free probability threshold in each time period is determined, as well as the target high-voltage circuit breaker corresponding to each target fault-free probability. Based on the probability of no faults of several targets in each time period, the target high-voltage circuit breakers are sorted from smallest to largest to determine the maintenance priority of the target high-voltage circuit breakers. Based on the maintenance priority of the target high-voltage circuit breaker, a circuit breaker maintenance strategy is generated for each time period.

7. A maintenance decision-making device for a high-voltage circuit breaker, characterized in that, include: The data acquisition module is used to acquire performance information parameters, maximum number of interruptions, and fault current of several high-voltage circuit breakers in the power system under each historical interruption state. The first fault-free probability module is used to input the maximum number of interruptions and the fault current into a preset wear-free fault probability model, so that the wear-free fault probability model outputs the wear-free fault probability of each of the high-voltage circuit breakers in each future time period; wherein, the wear-free fault probability model is a mathematical model that evaluates the safety availability margin of the high-voltage circuit breaker based on the maximum number of interruptions and the fault current experienced by the high-voltage circuit breaker, and then determines the wear-free fault probability of the high-voltage circuit breaker in the future based on the safety availability margin; The second fault-free probability module is used to determine the probability of no initial fault for each high-voltage circuit breaker and the probability of no sudden fault for each high-voltage circuit breaker in each future time period based on the performance information parameters of each high-voltage circuit breaker; wherein, the probability of no initial fault is the probability that the high-voltage circuit breaker will not fail during the initial interruption; the probability of no sudden fault is the probability that the high-voltage circuit breaker will not fail due to the sudden failure of a key component. The fault-free probability calculation module is used to determine the fault-free probability of the high-voltage circuit breaker in each future time period based on the wear-free fault probability, the sudden fault probability, and the initial fault probability. The maintenance strategy generation module is used to determine, based on the fault-free probability, several target high-voltage circuit breakers that need to be maintained in each future time period, and generate corresponding circuit breaker maintenance strategies. The wear-free failure probability model outputs the wear-free failure probability of each of the high-voltage circuit breakers in each future time period, including: Based on the maximum number of breaking operations of each high-voltage circuit breaker, the number of breaking operations and the safety margin of each high-voltage circuit breaker under several preset operating conditions are determined, and a time variable of the safety margin of several operating conditions is constructed with respect to time; wherein, the operating conditions include: a first operating condition, a second operating condition, and a third operating condition; the first operating condition is when the fault current is less than a first threshold, the second operating condition is when the fault current is between the first threshold and the second threshold, and the third operating condition is when the fault current is greater than the second threshold, the first threshold is less than the second threshold, and the second threshold is less than the third threshold; Based on the fault current, the number of interruptions, and the safety margin, determine the remaining number of interruptions for each high-voltage circuit breaker under each operating condition; Based on the number of interruptions, the remaining number of interruptions, and the time variable, the probability of wear-free failure for each of the high-voltage circuit breakers in each future time period is determined.

8. A terminal device, characterized in that, The device includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor, when executing the computer program, implements a maintenance decision method for a high-voltage circuit breaker as described in any one of claims 1 to 6.

9. A storage medium, characterized in that, The storage medium includes a stored computer program, wherein, when the computer program is executed, it controls the device where the storage medium is located to perform a maintenance decision method for a high-voltage circuit breaker as described in any one of claims 1 to 6.

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