Switch mechanical state evaluation method, device, equipment and storage medium

Abstract

The application provides a switch mechanical state evaluation method, device, equipment and storage medium. The method obtains a mechanical characteristic historical waveform of a switch device, extracts a to-be-evaluated characteristic value corresponding to the mechanical characteristic historical waveform, establishes a mode library based on a standard characteristic value corresponding to a standard waveform of a switch device opening / closing control loop, stores the standard characteristic value in the mode library, compares the to-be-evaluated characteristic value with the standard characteristic value, and determines a switch mechanical state evaluation result of the to-be-evaluated switch device. The mechanical characteristic historical waveform of the switch device includes a current waveform and a stroke curve. The application stores the standard characteristic value corresponding to the standard waveform in the mode library, compares the standard waveform (reference waveform) with historical data during power failure operation and switch action, thereby predicting the mechanical state of the switch device, effectively evaluating the mechanical state of the switch device by using test data, and reducing the failure to act.

Description

Technical Field

[0001] This invention relates to the field of equipment condition assessment technology, and in particular to a method, apparatus, equipment and storage medium for assessing the condition of switching machinery. Background Technology

[0002] In recent years, the failure rate of substation switchgear has increased, and batch-related hidden dangers in existing equipment have gradually surfaced. Switch failure to operate can lead to large-scale power outages, seriously threatening the safe operation of the system. The rising failure rate of mechanical components and secondary components of the switch mechanism is the main cause of switch failure to operate. Currently, it is impossible to assess the state of switches during power grid operation, to determine changes in switch mechanical characteristics, and to ascertain whether the switches will operate correctly next time. There is a lack of effective means to assess the state of operating switches, and consequently, failures to operate caused by this lack of assessment have not been reduced. Therefore, how to assess the mechanical state of switchgear is an urgent problem to be solved. Summary of the Invention

[0003] This invention provides a method, apparatus, device, and storage medium for evaluating the mechanical condition of a switch, in order to solve the problem in the prior art that it is impossible to determine changes in the mechanical characteristics of a switch and whether it can operate correctly next time, and that there is a lack of effective means to evaluate the state of the operating switch, which leads to the failure to reduce the failure to operate.

[0004] This invention provides a method for evaluating the mechanical condition of a switch, comprising:

[0005] Obtain the historical waveform of the mechanical characteristics of the switchgear, and extract the feature values ​​to be evaluated corresponding to the historical waveform of the mechanical characteristics;

[0006] A pattern library is established based on the standard feature values ​​corresponding to the standard waveforms of the switching equipment's opening / closing control circuit, and the standard feature values ​​are stored in the pattern library.

[0007] The evaluation result of the switching mechanical condition of the switchgear is determined by comparing the characteristic value to be evaluated with the standard characteristic value.

[0008] In the above scheme, the mechanical characteristic historical waveform includes current waveform and stroke waveform;

[0009] The extraction of the feature values ​​to be evaluated corresponding to the historical waveform of the mechanical characteristics includes:

[0010] Based on the current waveform, determine the current to be evaluated of the switching device at a preset time.

[0011] Based on the stroke waveform, determine the stroke curves to be evaluated for the springs and transmission components of the switching device.

[0012] In the above scheme, the preset time includes at least one of the following: the time when the iron core starts to move, the time when the iron core hits the bending plate, the time when the iron core moves to its maximum stroke, the time when the main contact of the switchgear completes opening / closing, and the time when the auxiliary contact of the switchgear opens.

[0013] In the above scheme, the standard waveforms of the switching equipment opening / closing control circuit include a current reference waveform and a travel reference waveform;

[0014] A pattern library is established based on the standard feature values ​​corresponding to the standard waveforms of the switching equipment's opening / closing control circuit, and the standard feature values ​​are stored in the pattern library, including:

[0015] Based on the current reference waveform, determine the reference current of the switching device at a preset time;

[0016] Based on the preset error, the envelope of the travel reference waveform is obtained, and the envelope is used as the standard travel curve.

[0017] The reference current and the standard stroke curve are stored as standard feature values ​​in the pattern library.

[0018] In the above scheme, comparing the feature value to be evaluated with the standard feature value to determine the switching mechanical condition evaluation result of the switchgear to be evaluated includes:

[0019] Based on the reference current and the current to be evaluated, determine the rate of variation of the switching device at a preset time.

[0020] The state of the circuit breaker of the switching equipment is determined based on the variation rate;

[0021] By comparing the standard stroke curve and the stroke curve to be evaluated, the state of the spring and transmission components of the switching device is determined.

[0022] The mechanical condition and the condition of the spring and transmission components are the evaluation results of the switching mechanical condition of the switching device.

[0023] In the above scheme, determining the state of the circuit breaker of the switching equipment based on the variation rate includes:

[0024] When the variation rate is less than or equal to a first preset threshold, the switching device is determined to be in a normal state.

[0025] When the variation rate is greater than or equal to a first preset threshold and less than or equal to a second preset threshold, the switching device is determined to be in a state of alert.

[0026] When the variation rate is greater than or equal to the second preset threshold and less than or equal to the third preset threshold, the switching device is determined to be in an abnormal state.

[0027] When the variation rate is greater than or equal to a third preset threshold and less than or equal to a fourth preset threshold, the switching device is determined to be in a critical state.

[0028] In the above scheme, the step of comparing the standard stroke curve and the stroke curve to be evaluated to determine the state of the spring and transmission components of the switching device includes:

[0029] When the travel curves to be evaluated are all located between the two standard travel curves, it is determined that the springs and transmission components of the switching device are in normal condition.

[0030] When at least one of the travel curves to be evaluated lies between the two standard travel curves, it is determined that the springs and transmission components of the switching device are in an abnormal state.

[0031] The present invention also provides a switch mechanical condition assessment device, comprising:

[0032] The acquisition module is used to acquire historical waveforms of the mechanical characteristics of the switchgear.

[0033] The feature extraction module is used to extract the feature values ​​to be evaluated corresponding to the historical waveforms of the mechanical characteristics;

[0034] The module is used to build a pattern library based on the standard feature values ​​corresponding to the standard waveforms of the switching equipment's opening / closing control circuit;

[0035] A storage module is used to store the standard feature values ​​into the pattern library;

[0036] The comparison module is used to compare the feature value to be evaluated with the standard feature value to determine the evaluation result of the switching mechanical condition of the switchgear to be evaluated.

[0037] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the switching mechanical condition assessment method as described in any of the above embodiments.

[0038] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, performs the switching mechanical condition assessment method as described in any of the above embodiments.

[0039] This invention provides a method, apparatus, device, and storage medium for assessing the mechanical condition of a switchgear. The method involves acquiring historical waveforms of the mechanical characteristics of the switchgear and extracting the corresponding feature values ​​to be assessed. A pattern library is established based on standard feature values ​​corresponding to standard waveforms of the switchgear's opening / closing control circuit, and these standard feature values ​​are stored in the pattern library. The feature value to be assessed is compared with the standard feature value to determine the assessment result of the switchgear's mechanical condition. The historical waveforms of the switchgear's mechanical characteristics include current waveforms and travel curves. This application, by constructing a pattern library and storing the standard feature values ​​corresponding to standard waveforms, compares the standard waveforms (reference waveforms) with historical data from power outage operations and switch actions to predict the mechanical condition of the switchgear. This effectively utilizes experimental data to assess the mechanical condition of the switchgear, reducing failures to operate. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0041] Figure 1 This is a flowchart illustrating a method for evaluating the mechanical condition of a switch provided in an embodiment of the present invention;

[0042] Figure 2 The current waveform diagram of the switching equipment opening / closing control circuit provided in the embodiments of this application;

[0043] Figure 3 Waveform diagram of the travel curve of the switching equipment opening / closing control circuit provided in the embodiments of this application;

[0044] Figure 4 This is a schematic diagram of the structure of the switch mechanical condition assessment device provided by the present invention;

[0045] Figure 5 This is a schematic diagram of the structure of the switch mechanical condition assessment device provided by the present invention;

[0046] Figure 6 This is a schematic diagram of the physical structure of an electronic device provided by the present invention. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0048] Figure 1 This is a flowchart illustrating a method for evaluating the mechanical condition of a switch according to an embodiment of the present invention, as shown below. Figure 1 As shown, the present invention provides a method for evaluating the mechanical condition of a switch, comprising:

[0049] S101. Obtain the historical waveform of the mechanical characteristics of the switchgear and extract the feature values ​​to be evaluated corresponding to the historical waveform of the mechanical characteristics.

[0050] In embodiments of the present invention, the mechanical characteristic historical waveform includes a current waveform and a travel waveform. Specifically, the mechanical characteristic historical waveform is the current waveform of the switching equipment's opening / closing control circuit during power outage operations and switching actions; that is, the mechanical characteristic historical waveform can be obtained by acquiring historical data of the switching equipment during power outage operations and switching actions.

[0051] In some embodiments of the present invention, S101 may further include:

[0052] S1011. Based on the current waveform, determine the current to be evaluated of the switching device at a preset time.

[0053] In some embodiments of the present invention, the preset time includes at least one of the following: the time when the iron core begins to move, the time when the iron core hits the bending plate, the time when the iron core moves to its maximum stroke, the time when the main contact of the switchgear completes opening / closing, and the time when the auxiliary contact of the switchgear opens.

[0054] Figure 2 The current waveform diagram of the switching equipment opening / closing control circuit provided in the embodiments of this application is as follows: Figure 2 As shown, preset times T1, T2, T3, T4, and T5, and I1, I2, I3, I4, and I5 are defined, where T is the time and I is the current corresponding to that time. The preset times and their corresponding currents are as follows:

[0055] T1 (I1): Indicates the moment when the iron core begins to move. At time T1, after the switchgear issues an opening / closing command, the coil is energized. Before time T1, the iron core is stationary, and the coil inductance is constant. When the current increases to a certain value, the electromagnetic attraction becomes strong enough to overcome the sum of the return spring force and the iron core's own weight. At time T1, the iron core begins to move, its speed gradually increases, the air gap of the electromagnet gradually decreases, and the opening / closing current also gradually decreases. It is worth noting that the occurrence of T1 is slightly earlier than one peak in the waveform of the opening / closing coil current of the high-voltage switchgear. For ease of on-site identification, the moment when one peak in the waveform of the opening / closing coil current is taken as the occurrence of T1.

[0056] T2(I2): This indicates the moment the iron core impacts the bending plate. At time T2, the iron core impacts the bending plate, and the mechanical part of the operating mechanism begins to move. After the impact, the movement of the iron core needs to overcome its own weight, spring force, and the reaction force of the tripping half-shaft. The speed of the iron core decreases, and the opening / closing current shows a local increase or a slower decreasing trend. It should be noted that if there is a local increase in the opening / closing current, T2 can be clearly observed; otherwise, T2 is not easily observed.

[0057] T3(I3): This indicates the moment when the iron core reaches its maximum stroke. At time T3, the iron core has reached its maximum stroke and remains in this position. At this point, the inductance is another constant, and the current rises exponentially to its steady-state value. The magnitude of the steady-state value reflects the secondary circuit power supply voltage and the DC resistance of the switching equipment.

[0058] T4(I4): Indicates the time when the main contacts of the switching equipment complete opening / closing. The specific value of T4 needs to be determined by testing the mechanical characteristics during power outage or by measuring the breaking time through the current waveform of the secondary winding of the AC current transformer when energized.

[0059] T5(I5): Indicates the moment when the auxiliary contact of the switchgear opens. When the auxiliary contact of the switchgear opens, the opening / closing control circuit is disconnected.

[0060] In some embodiments of the present invention, the current values ​​corresponding to the moment when the iron core starts to move, the moment when the iron core hits the bending plate, and the moment when the auxiliary contact of the switching equipment is disconnected are used as the current to be evaluated; wherein, the maximum current value in the historical waveform of the mechanical characteristics can also be obtained and used as the maximum current value to be evaluated.

[0061] S1012. Based on the stroke waveform, determine the stroke curves to be evaluated for the springs and transmission components of the switchgear.

[0062] It is understood that the embodiments of this application obtain historical waveforms of mechanical characteristics by acquiring historical data of the switchgear during power outage operations and switch actions, thereby realizing the assessment of the mechanical state of the switchgear. This can effectively utilize historical data to assess the mechanical state of the switchgear, reduce failure to operate, avoid the need to install additional online monitoring devices, have no impact on the effectiveness of the equipment itself, and can provide timely warnings of abnormal states where the switch opening or closing exceeds the technical specifications.

[0063] S102. Establish a pattern library based on the standard characteristic values ​​corresponding to the standard waveforms of the switching equipment's opening / closing control circuit, and store the standard characteristic values ​​in the pattern library.

[0064] In some embodiments of the present invention, since the historical waveform of mechanical characteristics includes both current waveform and travel waveform, the standard waveform should also include both current reference waveform and travel reference waveform. That is, the standard waveform of the switching equipment's opening / closing control circuit includes both current reference waveform and travel reference waveform. The current reference waveform includes the current waveforms of the two opening coils and one closing coil. The current reference waveform can be collected and provided by the manufacturer. For data that cannot be collected, on-site testing can be conducted, and the data from the on-site test can be used as the current reference waveform.

[0065] In some embodiments of the present invention, each switchgear includes three sets of characteristic values: the standard characteristic value corresponding to the standard waveform of the first trip coil control circuit, the standard characteristic value corresponding to the standard waveform of the second trip coil control circuit, and the standard characteristic value corresponding to the standard waveform of the closing coil control circuit. The factory data is preferred for the standard waveform of each switchgear; however, many switches have been in operation for a long time, making it impossible to obtain the corresponding factory data. In such cases, historical data during normal operation can be considered as the standard waveform.

[0066] In some embodiments of the present invention, S102 may further include:

[0067] S1021. Determine the reference current of the switching device at a preset time based on the current reference waveform.

[0068] S1022. Based on the preset error, obtain the envelope of the travel reference waveform and use the envelope as the standard travel curve.

[0069] In some embodiments of the present invention, the preset error is ±5%, that is, the waveform corresponding to ±5% of the travel reference waveform in the standard waveform of the switching device is taken as the envelope. The travel reference waveform is obtained at the factory. If the travel reference waveform cannot be obtained at the factory, the travel waveform in the earliest obtainable switching test data is used as the travel reference waveform. The envelope of the travel curve of the switching device at the factory should be controlled within 1%. Specifically, when obtaining the envelope of the travel curve corresponding to the spring mechanism in the 6th year, the preset error can be within 3%. The overhaul cycle of the hydraulic mechanism is 24 years. When obtaining the envelope of the travel curve corresponding to the hydraulic mechanism in the 6th year, the preset error can be within ±2%, in the 12th year it can be within ±3%, and in the 18th year it can be within ±4%.

[0070] S1023. Store the reference current and standard stroke curve as standard characteristic values ​​in the mode library.

[0071] Understandably, by constructing a pattern library and storing the standard characteristic values ​​corresponding to the standard waveforms in the pattern library, and by comparing the standard waveforms (reference waveforms) with historical data during power outages and switch operations, the mechanical state of the switchgear can be predicted. This can effectively utilize test data to evaluate the mechanical state of the switchgear and reduce failures to operate.

[0072] S103. Compare the characteristic value to be evaluated with the standard characteristic value to determine the evaluation result of the switching mechanical condition of the switchgear to be evaluated.

[0073] In some embodiments of the present invention, the feature value to be evaluated corresponding to the current waveform is compared with the standard feature value of the corresponding current reference waveform, and the feature value to be evaluated corresponding to the travel waveform is compared with the standard feature value of the corresponding travel reference waveform.

[0074] In some embodiments of the present invention, when comparing the characteristic value to be evaluated corresponding to the current waveform with the standard characteristic value of the corresponding current reference waveform, the comparison is made based on the current values ​​of the current waveform and the current reference waveform at different times. For example, based on the time from the start of the iron core movement until it hits the bending plate (T12), the time from the iron core hitting the bending plate until the auxiliary contact of the switchgear is opened (T25), and the maximum current value (Imax) of the switchgear control circuit, the corresponding characteristic value to be evaluated and the reference current are obtained from the standard waveform and the mechanical characteristic historical waveform. By comparing the characteristic value to be evaluated and the reference current, the mechanical state of the switchgear is determined. For example: When comparing the time from the start of the iron core movement to the impact of the bending plate, if the characteristic value to be evaluated is greater than 10% of the reference current, it indicates that the opening / closing starting component of the switchgear has defects such as coil aging and jamming; when comparing the time from the iron core impacting the bending plate to the opening of the auxiliary contact of the switchgear, if the characteristic value to be evaluated is greater than 10% of the reference current, it indicates that the main actuator of the opening / closing of the switchgear has defects such as spring fatigue, mechanism jamming, and insufficient lubrication of transmission components; when comparing the maximum current based on the control circuit of the switchgear, if the characteristic value to be evaluated is greater than 10% of the reference current, it indicates that the opening / closing control circuit coil of the switchgear has inter-turn breakdown; if the current of the opening / closing control circuit of the switchgear is zero in the mechanical characteristic historical waveform, it indicates that the opening / closing control circuit of the switchgear is open; if the current of the opening / closing control circuit of the switchgear is greater than the reference current and remains unchanged in the mechanical characteristic historical waveform, it indicates that the opening / closing control circuit of the switchgear is short-circuited.

[0075] In some embodiments of the present invention, S103 may further include:

[0076] S1031. Determine the rate of variation of the switching device at a preset time based on the reference current and the current to be evaluated.

[0077] In some embodiments of the present invention, the rate of variation is defined as the ratio of the feature value to be evaluated to the standard feature value.

[0078] In some embodiments of the present invention, α is defined as the eigenvalue variation rate of the first tripping coil current waveform of the switching equipment, β as the eigenvalue variation rate of the second tripping coil current waveform of the switching equipment, and γ as the eigenvalue variation rate of the closing coil current waveform of the switching equipment. α, β, and γ are shown below:

[0079]

[0080] α = [α1 α2 α3] T

[0081]

[0082] β = [β1 β2 β3] T

[0083]

[0084] γ = [γ1 γ2 γ3] T

[0085] S1032. Determine the status of the circuit breaker of the switching equipment based on the variability rate;

[0086] In some optional embodiments, the switching device is determined to be in a normal state when the variation rate is less than or equal to a first preset threshold.

[0087] When the variation rate is greater than or equal to the first preset threshold and less than or equal to the second preset threshold, the switching device is determined to be in a state of alert.

[0088] When the variation rate is greater than or equal to the second preset threshold and less than or equal to the third preset threshold, the switching equipment is determined to be in an abnormal state.

[0089] When the variation rate is greater than or equal to the third preset threshold and less than or equal to the fourth preset threshold, the switching equipment is determined to be in a critical state.

[0090] In some optional embodiments, the first preset threshold is 10%, the second preset threshold is 20%, the third threshold is 30%, and the fourth preset threshold is 40%.

[0091] S1033. Compare the standard stroke curve and the stroke curve to be evaluated to determine the state of the springs and transmission components of the switchgear; wherein, the mechanical state and the state of the springs and transmission components are the switchgear mechanical state evaluation results.

[0092] In some optional embodiments, when all the travel curves to be evaluated are located between the two standard travel curves, it is confirmed that the springs and transmission components of the switchgear are in a normal state; when at least one of the travel curves to be evaluated is located between the two standard travel curves, it is confirmed that the springs and transmission components of the switchgear are in an abnormal state.

[0093] In some alternative embodiments, Figure 3 The waveform diagram of the travel curve of the switching equipment opening / closing control circuit provided in the embodiments of this application is as follows: Figure 3 As shown, by determining whether the stroke curve to be evaluated lies within the envelope corresponding to the stroke reference waveform, i.e., whether the stroke curve to be evaluated lies within the standard stroke curve, it is confirmed that the spring and transmission components of the switchgear are in an abnormal state, thus achieving the purpose of early warning of the spring state and actuator state of the switchgear. Specifically, when the preset error is ±5%, the envelope obtained by +5% of the reference waveform is the upper envelope, and the envelope obtained by -5% of the reference waveform is the lower envelope. Figure 3 The dashed lines in the diagram represent the points in time when the contacts of the circuit breaker of the switching equipment separate or make contact.

[0094] In the above scheme, the standard stroke curve and the stroke curve to be evaluated are compared to determine the state of the springs and transmission components of the switchgear, including:

[0095] When the travel curves to be evaluated are all located between the two standard travel curves, it is determined that the springs and transmission components of the switchgear are in normal condition.

[0096] When at least one of the travel curves to be evaluated lies between two standard travel curves, it is determined that the springs and transmission components of the switchgear are in an abnormal state.

[0097] In some alternative embodiments, Figure 4 This is a schematic diagram of the structure of the switch mechanical condition assessment device provided by the present invention, as shown below. Figure 4 As shown, the left figure shows the envelope obtained from the standard waveform, and the right figure is a schematic diagram comparing the stroke curve to be evaluated with two standard stroke curves. It can be seen that the stroke curve to be evaluated is located between the two standard stroke curves, so the spring and transmission components of the switch are considered to be in normal condition.

[0098] Understandably, comparing historical data from power outage operations and switch actions with baseline waveforms to predict switch status effectively utilizes test data and avoids the impact of adding online monitoring devices on the stability of the equipment itself.

[0099] Figure 5 This is a schematic diagram of the structure of the switch mechanical condition assessment device provided by the present invention, as shown below. Figure 5 As shown, the present invention also provides a switch mechanical condition assessment device, comprising:

[0100] Module 51 is used to acquire historical waveforms of the mechanical characteristics of the switchgear;

[0101] Feature extraction module 52 is used to extract the feature values ​​to be evaluated corresponding to the historical waveform of the mechanical characteristics;

[0102] Module 53 is used to build a pattern library based on the standard feature values ​​corresponding to the standard waveforms of the switching equipment opening / closing control circuit;

[0103] Storage module 54 is used to store the standard feature values ​​into the pattern library;

[0104] The comparison module 55 is used to compare the feature value to be evaluated with the standard feature value to determine the evaluation result of the switching mechanical condition of the switchgear to be evaluated.

[0105] In some optional embodiments, the mechanical characteristic history waveform includes a current waveform and a travel waveform; the feature extraction module 52 is further configured to determine the current to be evaluated of the switching device at a preset time based on the mechanical characteristic history waveform; and to determine the travel curve to be evaluated corresponding to the spring and transmission component of the switching device based on the travel waveform.

[0106] In some optional embodiments, the standard waveform of the switching device opening / closing control circuit includes a current reference waveform and a travel reference waveform; the construction module 53 is further configured to determine the reference current of the switching device at a preset time based on the current reference waveform; and to obtain the envelope of the travel reference waveform based on a preset error, and use the envelope as a standard travel curve;

[0107] The storage module 54 is also used to store the reference current and the standard stroke curve as the standard feature values ​​in the pattern library.

[0108] In some optional embodiments, the comparison module 55 is further configured to: determine the rate of variation of the switching device at a preset time based on the reference current and the current to be evaluated; determine the state of the circuit breaker of the switching device based on the rate of variation; and compare the standard travel curve and the travel curve to be evaluated to determine the state of the spring and transmission components of the switching device; wherein the mechanical state and the state of the spring and transmission components are the switching mechanical state evaluation results of the switching device.

[0109] In some optional embodiments, the comparison module 55 is further configured to determine that the switching device is in a normal state when the variation rate is less than or equal to a first preset threshold.

[0110] When the mutation rate is greater than or equal to a first preset threshold and less than or equal to a second preset threshold, the switching device is determined to be in a state of alert; when the mutation rate is greater than or equal to a second preset threshold and less than or equal to a third preset threshold, the switching device is determined to be in an abnormal state; when the mutation rate is greater than or equal to a third preset threshold and less than or equal to a fourth preset threshold, the switching device is determined to be in a state of severity.

[0111] In some optional embodiments, the comparison module is further configured to confirm that the springs and transmission components of the switching device are in a normal state when all the travel curves to be evaluated are located between the two standard travel curves; and to confirm that the springs and transmission components of the switching device are in an abnormal state when at least one of the travel curves to be evaluated is located between the two standard travel curves.

[0112] Figure 6 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 6As shown, the electronic device provided by this invention may include: a processor 810, a communication interface 820, a memory 830, and a communication bus 840, wherein the processor 810, the communication interface 820, and the memory 830 communicate with each other through the communication bus 840. The processor 810 can call logic instructions in the memory 830 to execute the switching mechanical state evaluation methods provided by the above methods.

[0113] Furthermore, the logical instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0114] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the switching mechanical state assessment method provided by the above methods.

[0115] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. 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. Those skilled in the art can understand and implement this without any creative effort.

[0116] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0117] 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 them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method of evaluating a mechanical state of a switch, characterized by, include: The historical waveforms of the mechanical characteristics of the switchgear are acquired, and the corresponding feature values ​​to be evaluated are extracted. The historical waveforms include current waveforms and travel waveforms. The feature values ​​to be evaluated include the current to be evaluated and the travel curve to be evaluated. The current to be evaluated is determined based on the current value corresponding to the moment the iron core begins to move until it impacts the bending plate, the current value corresponding to the moment the iron core impacts the bending plate until the auxiliary contact of the switchgear opens, and the maximum current value of the switchgear control circuit. The travel curve to be evaluated is determined based on the travel waveforms. A pattern library is established based on the standard feature values ​​corresponding to the standard waveforms of the switching equipment's opening / closing control circuit, and the standard feature values ​​are stored in the pattern library; wherein, the standard waveforms of the switching equipment's opening / closing control circuit include current reference waveforms and travel reference waveforms; The characteristic value to be evaluated is compared with the standard characteristic value to determine the evaluation result of the switching mechanical condition of the switchgear to be evaluated; wherein... A pattern library is established based on the standard feature values ​​corresponding to the standard waveforms of the switching equipment's opening / closing control circuit, and the standard feature values ​​are stored in the pattern library, including: Based on the current reference waveform, determine the reference current of the switching device at a preset time; Based on the preset error, the envelope of the travel reference waveform is obtained, and the envelope is used as the standard travel curve. The reference current and the standard stroke curve are stored as standard feature values ​​in the pattern library; The step of comparing the feature value to be evaluated with the standard feature value to determine the switching mechanical condition evaluation result of the switchgear to be evaluated includes: Based on the reference current and the current to be evaluated, determine the rate of variation of the switching device at a preset time; based on the rate of variation, determine the state of the circuit breaker of the switching device. By comparing the standard stroke curve and the stroke curve to be evaluated, the state of the spring and transmission components of the switching device is determined. The state of the circuit breaker and the state of the spring and transmission components of the switching equipment are the switching mechanical state evaluation results of the switching equipment. Determining the state of the circuit breaker of the switching equipment based on the variation rate includes: When the variation rate is greater than or equal to a first preset threshold and less than or equal to a second preset threshold, the switching device is determined to be in a state of alert. When the variation rate is greater than or equal to the second preset threshold and less than or equal to the third preset threshold, the switching device is determined to be in an abnormal state. When the variation rate is greater than or equal to the third preset threshold and less than or equal to the fourth preset threshold, the switching device is determined to be in a critical state. The step of comparing the standard travel curve and the travel curve to be evaluated to determine the state of the spring and transmission components of the switching device includes: When at least one of the travel curves to be evaluated is not located between the two standard travel curves, it is determined that the spring and transmission components of the switching device are in an abnormal state.

2. The method of evaluating the state of the switch mechanism according to claim 1, characterized by The extraction of the feature values ​​to be evaluated corresponding to the historical waveform of the mechanical characteristics includes: Based on the current waveform, determine the current to be evaluated of the switching device at a preset time. Based on the stroke waveform, determine the stroke curves to be evaluated for the springs and transmission components of the switching device.

3. The method for evaluating the mechanical condition of a switch according to claim 2, characterized in that, The preset time includes at least one of the following: the time when the iron core starts to move, the time when the iron core hits the bending plate, the time when the iron core moves to its maximum stroke, the time when the main contact of the switchgear completes opening / closing, and the time when the auxiliary contact of the switchgear opens.

4. The method for evaluating the mechanical condition of a switch according to claim 1, characterized in that, Determining the state of the circuit breaker of the switching equipment based on the variation rate includes: When the variation rate is less than or equal to a first preset threshold, the switching device is determined to be in a normal state.

5. The method for evaluating the mechanical condition of a switch according to claim 1, characterized in that, The step of comparing the standard travel curve and the travel curve to be evaluated to determine the state of the spring and transmission components of the switching device includes: When at least one of the travel curves to be evaluated lies between the two standard travel curves, it is determined that the springs and transmission components of the switching device are in an abnormal state.

6. A device for assessing the mechanical condition of a switch, characterized in that, include: The acquisition module is used to acquire historical waveforms of the mechanical characteristics of the switchgear. The feature extraction module is used to extract the feature values ​​to be evaluated corresponding to the historical waveforms of the mechanical characteristics; wherein, the historical waveforms of the mechanical characteristics include current waveforms and stroke waveforms; the feature values ​​to be evaluated include the current to be evaluated and the stroke curve to be evaluated, wherein the current to be evaluated is determined based on the current value corresponding to the moment when the iron core starts moving until the iron core hits the bending plate, the current value corresponding to the moment when the iron core hits the bending plate until the auxiliary contact of the switchgear opens, and the maximum current value of the control circuit of the switchgear; the stroke curve to be evaluated is determined based on the stroke waveforms; The module is used to build a pattern library based on the standard feature values ​​corresponding to the standard waveforms of the switching equipment's opening / closing control circuit; wherein, the standard waveforms of the switching equipment's opening / closing control circuit include a current reference waveform and a travel reference waveform; it is also used to determine the reference current of the switching equipment at a preset time based on the current reference waveform; and to obtain the envelope of the travel reference waveform based on a preset error, and use the envelope as a standard travel curve; The storage module is used to store the standard feature values ​​into the pattern library; it is also used to store the reference current and the standard stroke curve as the standard feature values ​​into the pattern library; The comparison module is used to compare the feature value to be evaluated with the standard feature value to determine the evaluation result of the switching mechanical state of the switchgear to be evaluated; it is also used to determine the rate of variation of the switchgear at a preset time based on the reference current and the current to be evaluated; determine the state of the circuit breaker of the switchgear based on the rate of variation; compare the standard travel curve and the travel curve to be evaluated to determine the state of the spring and transmission components of the switchgear; the state of the circuit breaker and the state of the spring and transmission components of the switchgear constitute the evaluation result of the switching mechanical state of the switchgear; it is also used to determine that the switchgear is in a state of alert when the rate of variation is greater than or equal to a first preset threshold and less than or equal to a second preset threshold; determine that the switchgear is in an abnormal state when the rate of variation is greater than or equal to a second preset threshold and less than or equal to a third preset threshold; determine that the switchgear is in a state of severe condition when the rate of variation is greater than or equal to a third preset threshold and less than or equal to a fourth preset threshold; and determine that the spring and transmission components of the switchgear are in an abnormal state when at least one of the travel curves to be evaluated is not located between the two standard travel curves.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the switch mechanical condition assessment method as described in any one of claims 1 to 5.

8. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the switch mechanical condition assessment method as described in any one of claims 1 to 5.

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