Photoelectric fusion arc light quick starting method and device

Abstract

The invention is suitable for the technical field of fault processing of power equipment, and provides a photoelectric fusion arc light quick starting method and device. The method comprises the following steps: acquiring an arc light signal and a current signal of target equipment; determining an original sequence and a differential sequence of the current signal based on the current signal; according to the original sequence and the differential sequence of the current signal, determining a bimodal current break variable joint criterion; determining a light sudden change criterion based on the arc light signal; setting a trigger condition based on the bimodal current sudden change combined criterion and the light sudden change criterion; and a real-time arc light signal and a real-time current signal of the target equipment are obtained, and when the real-time arc light signal and the real-time current signal of the target equipment meet the triggering condition, it is judged that the target equipment breaks down, and an arc light protection mechanism is executed on the target equipment. According to the photoelectric fusion arc light quick starting method, all phase scenes can be covered, the delay time is reduced, and the reliability and timeliness of protection action are enhanced.

Description

Technical Field

[0001] This application belongs to the technical field of fault handling of power equipment, and particularly relates to an arc light rapid startup method and device that combines optoelectronics. Background Art

[0002] In a switchgear system, busbar short - circuit or grounding faults are common types of electrical faults. When such faults occur, arc light will be generated in the busbar chamber, and at the same time, there will be a sudden change in the fault current in the power supply inlet line. By monitoring the changes in the arc light signal and the fault current, the fault state can be quickly identified and the fault handling process can be entered. The arc light protection device is a device that realizes busbar protection based on monitoring the arc light signal, and its core component is the startup component, which is used to identify the fault state and trigger the protection action.

[0003] In order to quickly and accurately identify the fault state and trigger the protection action, a current sudden change criterion is set. The current sudden change criterion quickly identifies abnormalities by monitoring the sudden change in current, and shortens the fault detection time. However, the existing current sudden change criterion has significant phase - sensitivity problems in practical applications. The traditional current sudden change criterion has low sensitivity near the zero point of the fault current waveform (such as 0° phase), resulting in startup delay. This is because when the fault occurs near the zero point of the current waveform, the amplitude of the sudden change is small and it is difficult to reach the preset trigger threshold in the traditional current sudden change criterion. This phase - sensitivity makes the action time of the protection device closely related to the phase of the fault current, resulting in a large difference in the delay time of the protection action under different phases.

[0004] In practical applications, if the fault occurs near the peak or trough of the current waveform, the protection device needs to wait until the next trough or peak to trigger the action, and its delay time is close to 10 ms. This delay may seriously affect the timeliness of fault handling and thus pose a threat to the safe operation of the switchgear system. Summary of the Invention

[0005] To overcome the problems existing in the related art, the embodiments of this application provide an arc light rapid startup method and device that combines optoelectronics, which can cover all phase scenarios, reduce the delay time, and enhance the reliability and timeliness of the protection action.

[0006] This application is implemented through the following technical solutions:

[0007] In a first aspect, the embodiments of this application provide an arc light rapid startup method that combines optoelectronics, including:

[0008] Obtain the arc light signal and current signal of the target device;

[0009] Based on the current signal, determine the original sequence and differential sequence of the current signal;

[0010] Determine the combined criterion for the dual-modal current mutation quantity based on the original sequence and the differential sequence of the current signal;

[0011] Determine the optical mutation criterion based on the arc light signal;

[0012] Set the trigger condition based on the combined criterion for the dual-modal current mutation quantity and the optical mutation criterion;

[0013] Obtain the real-time arc light signal and the real-time current signal of the target device. When the real-time arc light signal and the real-time current signal of the target device meet the trigger condition, determine that the target device has a fault and execute the arc light protection mechanism for the target device.

[0014] In a possible implementation manner of the first aspect, when the real-time arc light signal and the real-time current signal of the target device meet the trigger condition, determining that the target device has a fault and executing the arc light protection mechanism for the target device includes:

[0015] When the real-time current signal of the target device meets the combined criterion for the dual-modal current mutation quantity and the real-time arc light signal of the target device meets the optical mutation criterion, the trigger condition is met, and it is determined that the target device has a fault and the arc light protection mechanism is executed for the target device.

[0016] In a possible implementation manner of the first aspect, determining the combined criterion for the dual-modal current mutation quantity based on the original sequence and the differential sequence of the current signal includes:

[0017] Determine the original current mutation quantity based on the original sequence of the current signal;

[0018] Determine the original current mutation quantity criterion based on the original current mutation quantity;

[0019] Determine the differential current mutation quantity based on the differential sequence of the current signal;

[0020] Determine the differential current mutation quantity criterion based on the differential current mutation quantity;

[0021] Determine the combined criterion for the dual-modal current mutation quantity based on the original current mutation quantity criterion and the differential current mutation quantity criterion.

[0022] In a possible implementation manner of the first aspect, determining the combined criterion for the dual-modal current mutation quantity based on the original current mutation quantity criterion and the differential current mutation quantity criterion includes:

[0023] Combine the original current mutation quantity criterion and the differential current mutation quantity criterion using the "OR" logic to form a single criterion;

[0024] Combine the original current mutation quantity criterion and the differential current mutation quantity criterion using the "AND" logic and combine with the phase of the current mutation part to form a dual criterion;

[0025] Based on single-criterion and double-criterion, a combined criterion of dual-mode current mutation quantity is determined.

[0026] In a possible implementation manner of the first aspect, the expression of the combined criterion of dual-mode current mutation quantity is:

[0027]

[0028] wherein, a value of 1 for the first trigger condition indicates triggering the protection action of the current mutation quantity, and a value of 0 for the first trigger condition indicates not triggering the protection action of the current mutation quantity; ΔI raw is the original current mutation quantity; 0.2I n is the threshold of the original current mutation quantity; ΔI diff is the differential current mutation quantity; 0.02I n is the threshold of the differential current mutation quantity; θ is the phase of the current mutation part.

[0029] In a possible implementation manner of the first aspect, based on the arc light signal, an optical mutation criterion is determined, including:

[0030] Based on the arc light signal, an optical mutation quantity is determined;

[0031] Based on the optical mutation quantity, an optical mutation criterion is determined.

[0032] In a possible implementation manner of the first aspect, the expression of the optical mutation criterion is:

[0033]

[0034] wherein, a value of 1 for the second trigger condition indicates triggering the optical mutation protection action, and a value of 0 for the second trigger condition indicates not triggering the optical mutation protection action; ΔP raw is the optical mutation quantity; ΔP th is the absolute threshold of the optical mutation quantity.

[0035] In a possible implementation manner of the first aspect, based on the current signal, the original sequence and the differential sequence of the current signal are determined, including:

[0036] The current signal is preprocessed to obtain the original sequence of the current signal;

[0037] Based on the original sequence of the current signal, the effective current characteristic information is determined;

[0038] Using the effective current characteristic information, the differential sequence of the current signal is determined.

[0039] In a possible implementation manner of the first aspect, the expression of the differential current mutation quantity is:

[0040]

[0041] Among them, ΔI diff (n) is the differential current mutation of the current signal at time n; is the differential sequence of the current signal at time n; is the differential sequence of the current signal at time n - 2.

[0042] In a second aspect, the present application provides an optoelectronic fusion arc light rapid start device for performing the optoelectronic fusion arc light rapid start method as in the first aspect, including:

[0043] A data acquisition module for acquiring the arc light signal and current signal of the target device;

[0044] A preprocessing module for determining the original sequence and differential sequence of the current signal based on the current signal;

[0045] A first criterion determination module for determining a combined criterion for dual - mode current mutation based on the original sequence and differential sequence of the current signal;

[0046] A second criterion determination module for determining a light mutation criterion based on the arc light signal;

[0047] A trigger condition determination module for setting the combined criterion for dual - mode current mutation and the light mutation criterion as trigger conditions;

[0048] A determination module for acquiring the real - time arc light signal and real - time current signal of the target device. When the real - time arc light signal and real - time current signal of the target device meet the trigger conditions, it is determined that the target device has a fault and an arc light protection mechanism is executed on the target device.

[0049] It can be understood that the beneficial effects of the above - mentioned second aspect can be referred to the relevant descriptions in the above - mentioned first aspect and will not be elaborated here.

[0050] The beneficial effects of the embodiments of the present application compared with the prior art are as follows:

[0051] In the embodiments of the present application, when a short - circuit or grounding fault occurs in the switch cabinet busbar, the arc light generated in the busbar chamber and the fault current mutation at the power supply inlet end provide dual criteria for fault identification. By real - time monitoring the sudden enhancement of the arc light signal and the mutation of the current effective value, the fault state is quickly determined and the protection action is triggered. Among them, the current mutation and light mutation are calculated simultaneously. The current mutation core starting element adopts a combined criterion for dual - mode current mutation based on the original sequence and differential sequence, combines with the light mutation criterion to determine the fault, and then executes the starting protection. The sensitivity phase characteristics of the original mutation criterion and the differential mutation criterion are complementary. The combined criterion can cover all phase scenarios, reduce the delay time, and enhance the reliability and timeliness of the protection action.

[0052] Among them, the original current mutation criterion and the differential current mutation criterion are sensitive to different types of faults respectively. By combining these two criteria, a wider range of fault types can be covered. The single criterion responds quickly at the initial stage of the fault, shortening the protection operation time and reducing the damage to the equipment caused by the fault. The dual criterion provides higher accuracy in the fault confirmation stage, avoiding unnecessary power outages or equipment damage caused by misjudgment. The dual-mode combined criterion combines the advantages of both, ensuring both rapidity and accuracy.

[0053] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0055] Figure 1 is a schematic flowchart of an optoelectronic fusion arc light rapid start method provided by an embodiment of the present application;

[0056] Figure 2 is a schematic diagram of sine current mutation provided by an embodiment of the present application;

[0057] Figure 3 is a schematic diagram of the criterion execution logic provided by an embodiment of the present application;

[0058] Figure 4 is a schematic structural diagram of an optoelectronic fusion arc light rapid start device provided by an embodiment of the present application;

[0059] Figure 5 is a schematic structural diagram of a controller provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0060] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0061] It should be understood that, as used in the specification of this application and the appended claims, the term "comprising" indicates the presence of the described features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or their groups.

[0062] It should also be understood that the term "and / or" as used in the specification of this application and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0063] As used in the specification of this application and the appended claims, the term "if" may be construed, depending on the context, as "when", "once", "in response to determining", or "in response to detecting". Similarly, the phrase "if determined" or "if [the described condition or event] is detected" may be construed, depending on the context, as meaning "once determined", "in response to determining", "once [the described condition or event] is detected", or "in response to detecting [the described condition or event]".

[0064] In addition, in the description of the specification of this application and the appended claims, the terms "first", "second", "third", etc. are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0065] Reference to "one embodiment" or "some embodiments" or the like described in the specification of this application means that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of this application. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in another way. The terms "comprising", "including", "having", and their variants all mean "including but not limited to", unless otherwise specifically emphasized in another way.

[0066] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0067] Figure 1 is a schematic flowchart of an optoelectronic fusion arc rapid startup method provided by an embodiment of this application. Referring to Figure 1 , the detailed description of the optoelectronic fusion arc rapid startup method is as follows:

[0068] An embodiment of this application provides an optoelectronic fusion arc rapid startup method, and the method includes:

[0069] Step 101, obtain the arc light signal and current signal of the target device.

[0070] Exemplarily, the light signal and current signal of the photoelectric sensor are collected in real time. Among them, for the acquisition of the arc light signal, an arc light sensor with high sensitivity and fast response characteristics can be selected. This sensor can accurately capture the arc light changes generated by the target device during operation. For the acquisition of the current signal, a high-precision current transformer is used. When selecting the current transformer, the current rating of the target device needs to be considered to ensure that the range of the transformer can meet the requirements of device current measurement.

[0071] To improve the real-time performance of signal acquisition, a high-speed data acquisition card can be used to quickly convert the light signal and current signal collected by the photoelectric sensor into digital signals for subsequent processing and analysis.

[0072] Step 102, determine the original sequence and differential sequence of the current signal based on the current signal.

[0073] Exemplarily, determining the original sequence and differential sequence of the current signal based on the current signal includes: preprocessing the current signal to obtain the original sequence of the current signal; determining the effective current characteristic information based on the original sequence of the current signal; and determining the differential sequence of the current signal using the effective current characteristic information.

[0074] Among them, the original sequence refers to the current signal values arranged directly in a certain order without processing. It is a form of data record of the most original state of the current signal, reflecting the initial numerical situation of the current signal at each time point or spatial position point.

[0075] The differential sequence is the effective current characteristic information calculated from the original sequence. Specifically, each element in the differential sequence is the difference between adjacent elements in the original sequence. For example, if the original sequence is [x1, x2, x3,...], then its differential sequence is [x2 - x1, x3 - x2,...]. The differential sequence can reflect the change trend of the original sequence data and has important significance in analyzing the dynamic characteristics and change rate of the current signal, which helps to further explore the hidden laws and characteristic information in the current signal.

[0076] Step 103, determine the combined criterion of dual-mode current mutation based on the original sequence and differential sequence of the current signal.

[0077] Exemplarily, for determining whether a fault occurs using the criterion formed by the original sequence of current signals, when the fault occurs near the zero point of the current, the sensitivity of the sudden change amount is low, resulting in startup delay. However, when the fault occurs near the 90° or 270° phase of the current waveform, the amplitude of the sudden change amount is large, and it is easy to trigger the protection action. Therefore, it is necessary to wait until near the phase of 90° / 270° to trigger the threshold. For example, for the conventional sudden change amount setting of 0.2In, its action time is related to the phase of the current mutation part. In the worst case, when the mutation value is equal to 0.2In, the phase at the mutation moment just passes the peak or trough, and it needs to wait until the next trough or peak to act, and the time is close to 10 ms.

[0078] For determining whether a fault occurs using the criterion formed by the differential sequence of current signals, the differential sequence is more sensitive to the rate of change of the current. The amplitude of the sudden change amount is the largest near the zero point (phase 0° or 180°), but the sensitivity is the lowest near the peak / trough (phase 90° or 270°).

[0079] Therefore, the sensitivity phase characteristics of the criterion formed by the original sequence of current signals and the criterion formed by the differential sequence of current signals are complementary, and the dual-mode current sudden change amount joint criterion can cover all phase scenarios.

[0080] Step 104: Determine the optical mutation criterion based on the arc light signal.

[0081] Exemplarily, under normal circumstances, the intensity of the arc light signal is in a relatively stable range. When some abnormal situations (such as equipment failure, circuit abnormality, etc.) occur, the intensity of the arc light signal may suddenly increase or decrease; the normal arc light signal frequency has its inherent mode, and once an abnormality occurs, the frequency may change significantly. For example, it suddenly jumps from a stable frequency value to another frequency value, or the fluctuation range of the frequency exceeds the normal range, which can also be used as one of the bases for judging optical mutation; if the duration of the arc light signal is short, it may be caused by some short-term interferences; but if the duration of the arc light signal is long and there is a significant difference from the normal arc light duration, then this change in duration can also be considered in the optical mutation criterion. Therefore, by comprehensively analyzing the characteristics of multiple aspects such as the intensity, frequency, and duration of the arc light signal and their differences from the normal situation, the optical mutation criterion based on the arc light signal can be determined.

[0082] Step 105: Set the trigger condition based on the dual-mode current sudden change amount joint criterion and the optical mutation criterion.

[0083] Step 106: Obtain the real-time arc light signal and real-time current signal of the target device. When the real-time arc light signal and real-time current signal of the target device meet the trigger condition, it is determined that the target device has a fault and the arc light protection mechanism is executed for the target device.

[0084] In this embodiment, when a short - circuit or ground - fault occurs in the target device, such as the busbar of a switchgear cabinet, the arc light generated in the busbar chamber and the sudden change of the fault current at the power - inlet end provide dual criteria for fault identification. By real - time monitoring of the sudden increase of the arc - light signal and the sudden change of the effective value of the current, the fault state is quickly determined and the protection action is triggered. Among them, the current mutation and the light mutation are calculated simultaneously. The core starting element of the current mutation is based on the original sequence and the differential sequence, and adopts a combined criterion of dual - mode current mutation variables. Combining with the light - mutation criterion to determine the occurrence of a fault, and then starting the protection. The sensitivity phase characteristics of the original mutation criterion and the differential mutation criterion are complementary. The combined criterion can cover all phase scenarios, reduce the delay time, and enhance the reliability and timeliness of the protection action.

[0085] In one embodiment, after obtaining the arc - light signal and the current signal of the target device, and determining the original sequence and the differential sequence of the current signal based on the current signal, the process of determining the combined criterion of dual - mode current mutation variables according to the original sequence and the differential sequence of the current signal is specifically introduced. Step 103 includes:

[0086] Step 1031: Determine the original current mutation variable based on the original sequence of the current signal.

[0087] The original current mutation variable ΔI raw The calculation formula:

[0088] ΔI raw (n)=|I(n)-I(n - 1)|

[0089] where I(n) is the original sequence of the current signal at time n, and I(n - 1) is the original sequence of the current signal at time n - 1.

[0090] Step 1032: Determine the original current mutation - variable criterion based on the original current mutation variable.

[0091] The original current mutation - variable criterion:

[0092]

[0093] is the original current mutation - variable threshold; can take 0.2I n ; I n is the rated current.

[0094] Step 1033: Determine the differential current mutation variable based on the differential sequence of the current signal.

[0095] Exemplarily, the expression of the differential current mutation variable is:

[0096]

[0097] where ΔI diff (n) is the difference sequence of the current signal at time n; is the difference sequence of the current signal at time n; is the difference sequence of the current signal at time n - 2.

[0098] Step 1034: Determine the differential current mutation criterion based on the differential current mutation amount.

[0099] Differential current mutation criterion:

[0100]

[0101] is the differential current mutation threshold; can be calculated by 0.2I n ×2sin(π / N), when N = 64,

[0102] Step 1035: Determine the combined criterion of the dual - mode current mutation amount based on the original current mutation criterion and the differential current mutation criterion.

[0103] Step 1035 includes:

[0104] Combine the original current mutation criterion and the differential current mutation criterion using the "OR" logic to form a single criterion.

[0105] Exemplarily, the single criterion is triggered when one of the following conditions is met:

[0106] ΔI eaw ≥0.2I n OR ΔI diff ≥0.02I n

[0107] Combine the original current mutation criterion and the differential current mutation criterion using the "AND" logic, and combine with the phase of the current mutation part to form a dual criterion.

[0108] Exemplarily, the criterion is triggered when the following conditions are met simultaneously:

[0109] ΔI raw ≥0.2I n ×sin(θ) AND ΔI diff ≥0.02I n ×sin(θ)

[0110] Determine the combined criterion of the dual - mode current mutation amount based on the single criterion and the dual criterion.

[0111] Exemplarily, the expression of the dual-mode current mutation combined criterion is as follows:

[0112]

[0113] wherein, when the value of the first trigger condition is 1, it indicates that the dual-mode current mutation combined criterion is satisfied, triggering the protection action of the current mutation; when the value of the first trigger condition is 0, it indicates that the dual-mode current mutation combined criterion is satisfied, and the protection action of the current mutation is not triggered; ΔI raw is the original current mutation; 0.2I n is the threshold of the original current mutation; ΔI diff is the differential current mutation; 0.02I n is the threshold of the differential current mutation; θ is the phase of the current mutation part.

[0114] In this embodiment, for a single criterion, when the original current mutation or the differential current mutation exceeds the threshold, it directly triggers the pre-action of the arc protection mechanism. At this time, the single criterion can cover the sensitivity peak phases of 90° / 270° and 0° / 180°. Among them, the phase corresponding to the original current mutation criterion is at 90° / 270°, and the phase corresponding to the differential current mutation criterion is at 0° / 180°. For the dual criterion, when the dual-mode current mutation combined criterion exceeds the threshold, it mainly solves the problem of the sensitivity trough near θ = 45°, and improves the coverage rate by reducing the threshold.

[0115] To better understand the above scheme, refer to Figure 2 , Figure 2 which is a schematic diagram of sinusoidal current mutation. Taking a 50HZ system as an example, line 1 is the normal sinusoidal current waveform before the current mutation, line 2 is the waveform of the sinusoidal current after the mutation with the mutant current applied, and line 3 is the waveform of the current mutation part.

[0116] The time window that cannot be started quickly is around 0 o'clock. The phase of the corresponding differential queue is at the peak / trough, which is the most sensitive moment of the original current mutation. Therefore, adding the differential current mutation to the starting element, taking the "OR" relationship with the starting element with the original current mutation, can improve the sensitivity and shorten the trigger start time. When the original current mutation is equal to 0.2I n , the worst-case trigger start time can be shortened to 5ms.

[0117] For example, analyzing the worst case: when the phase is 45°, the combined sensitivity of the original current mutation and the differential current mutation is the lowest. If it is to be triggered at this time, it needs to satisfy:

[0118] K×0.2I n ×sin(45°)≥0.2I n

[0119] When the sudden change in the original current is 0.2I n and K = 1.414, it means that the effective value of the mutated part needs to reach 0.2828 times the rated current I n to meet the triggering condition.

[0120] At a phase of 45°, the effective value of the mutated part at this time is 0.44I n ×sin45°≈0.311I n , which is greater than 0.2828I n , meeting the condition. It can be seen that after taking the "OR" of the two sudden change amounts, when the effective value of the current mutated part is greater than 1.414 times the set value of the sudden change amount, any phase can trigger and start immediately. Or when both the sudden change amount of the original current and the sudden change amount of the differential current are greater than the set value of the sudden change amount / 1.414, it also triggers and starts. Table 1 shows the action times for different effective values of the sudden change amount.

[0121] Table 1 Comparison of action times for different effective values of the sudden change amount

[0122] Effective value of mutation Trigger start range Operating time <![CDATA[ΔI fault ≥0.2828I n > Full-phase coverage, start immediately ≤0.3125ms (1 sampling point) <![CDATA[ΔI fault <0.2828I n > Partial phase requires waiting for phase change Longest 5ms (1 / 4 cycle)

[0123] Triggering condition ΔI raw ≥0.2I n OR ΔI diff ≥0.02I n , time calculation:

[0124]

[0125] Taking 0.25I n and 0.2I n as examples. ΔI fault = 0.25I n , the triggering phase is 60°, and the maximum triggering time is 1.66 ms. ΔI fault = 0.2I n , the triggering phase is 90°, and the maximum triggering time is 5 ms.

[0126] In this embodiment, a dual-mode current sudden change amount joint criterion is used, that is, a starting element is constructed by taking the "OR" relationship between the sudden change amount of the original current and the sudden change amount of the differential current. This joint criterion fully considers the characteristics of the current sudden change amount at different phases. In the phases corresponding to the time window where it cannot start quickly (such as around 0 o'clock, the differential queue phase is at the peak / trough), the sudden change amount of the differential current is increased to improve the sensitivity. Under various effective values of the sudden change amount, the starting range and action time are accurately analyzed. For example, when the effective value of the sudden change amount is greater than or equal to 0.2828I nWhen the full-phase coverage is achieved, it starts immediately with an extremely short action time; while when the effective value of the sudden change quantity is less than 0.2828In, some phases need to wait for the phase change, and the longest action time is 5ms. Taking 0.25I n and 0.2I n as examples, the maximum trigger time under different trigger phases is specifically shown. The application of this criterion effectively solves the problems such as insensitive startup and long startup time that may exist in the traditional single sudden change quantity criterion, thus achieving the effect that the startup time in the worst case can be shortened to 5ms, greatly improving the response speed and reliability of the system, and having important practical value in related fields such as power system fault detection.

[0127] In one embodiment, the process of determining the optical mutation criterion based on the arc light signal is specifically introduced. Step 104 includes: determining the optical sudden change quantity based on the arc light signal; and determining the optical mutation criterion based on the optical sudden change quantity.

[0128] Exemplarily, the expression of the optical mutation criterion is:

[0129]

[0130] wherein, when the value of the second trigger condition is 1, it triggers the optical mutation protection action, and when the value of the second trigger condition is 0, it does not trigger the optical mutation protection action; ΔP raw is the optical sudden change quantity; ΔP th is the absolute threshold of the optical sudden change quantity. The optical mutation protection action is a pre-protection action before executing the arc light protection mechanism.

[0131] Exemplarily, ΔP th = 0.2P ref . Wherein, P ref is the reference optical power.

[0132] In step 103, the combined criterion of the dual-mode current sudden change quantity is determined. When the combined criterion of the dual-mode current sudden change quantity is satisfied (the value of the first trigger condition is 1), it will trigger the protection action of the current sudden change quantity (the protection action of the current sudden change quantity is a pre-protection action before executing the arc light protection mechanism, such as sending a warning signal or preparing for the circuit breaker to trip), and after the optical mutation criterion is determined in step 104, if the optical mutation criterion is also satisfied (the value of the second trigger condition is 1), the combined criterion of the dual-mode current sudden change quantity and the optical mutation criterion use the "AND" logic to determine that a fault has indeed occurred, as Figure 3 shown. Therefore, only when both criteria are satisfied, the system will execute the final arc light protection mechanism, such as the circuit breaker tripping, etc.

[0133] In step 105, when the real-time arc light signal and the real-time current signal of the target device meet the triggering conditions, it is determined that the target device has a fault and the arc light protection mechanism is executed for the target device, including: when the real-time current signal of the target device meets the combined criterion of dual-mode current sudden change amount and the real-time arc light signal of the target device meets the light mutation criterion, the triggering conditions are met, it is determined that the target device has a fault and the arc light protection mechanism is executed for the target device.

[0134] In step 106, after obtaining the real-time arc light signal and the real-time current signal of the target device, each sudden change amount is calculated through the real-time arc light signal and the real-time current signal, and compared with the combined criterion of dual-mode current sudden change amount and the light mutation criterion. When the triggering conditions are met, it is determined that a fault has occurred and the arc light protection mechanism is executed.

[0135] In addition, obtain the real-time arc light signal and the real-time current signal of the target device. When the real-time arc light signal and the real-time current signal of the target device meet the triggering conditions, it is determined that the target device has a fault and the arc light protection mechanism is executed for the target device, including: when the real-time arc light signal and the real-time current signal of the target device meet the triggering conditions, it is determined that the target device has a fault and at the same time the faulty circuit is disconnected, an alarm signal is sent, and the parameters of the target device are adjusted to restore stable operation.

[0136] It can be seen that the optoelectronic fusion arc light fast start method proposed by the present invention provides a dual criterion for fault identification by the arc light generated in the busbar chamber and the sudden change of the fault current at the power supply inlet end when a short circuit or ground fault occurs in the switch cabinet busbar. The optoelectronic fusion arc light fast start device quickly determines the fault state and triggers the protection action by real-time monitoring of the sudden increase of the arc light signal (light sudden change amount) and the sudden change of the effective value of the current (current sudden change amount). The current mutation and the light mutation are calculated simultaneously, and the core starting element of the current mutation adopts the combined criterion of dual-mode current sudden change amount: the "OR" logic based on the original sequence and the differential sequence. The light mutation and the current mutation criteria adopt the "AND" logic. If the judgment passes, it is determined that a fault has occurred, and then the protection is started. This two-stage protection strategy can reduce the misoperation caused by the misjudgment of a single criterion, and at the same time ensure that protective measures can be taken quickly and effectively when a real fault occurs.

[0137] See Figure 4 , the embodiment of the present application provides an optoelectronic fusion arc light fast start device for executing the optoelectronic fusion arc light fast start method of the above embodiment, including a data acquisition module 201, a preprocessing module 202, a first criterion determination module 203, a second criterion determination module 204, a trigger condition determination module 205, and a determination module 206.

[0138] The data acquisition module 201 is used to acquire the arc light signal and the current signal of the target device;

[0139] The preprocessing module 202 is configured to determine the original sequence and the differential sequence of the current signal based on the current signal;

[0140] The first criterion determination module 203 is configured to determine the combined criterion of the bimodal current mutation quantity according to the original sequence and the differential sequence of the current signal;

[0141] The second criterion determination module 204 is configured to determine the optical mutation criterion based on the arc light signal;

[0142] The trigger condition determination module 205 is configured to set a trigger condition based on the combined criterion of the bimodal current mutation quantity and the optical mutation criterion;

[0143] The determination module 206 is configured to obtain the real-time arc light signal and the real-time current signal of the target device. When the real-time arc light signal and the real-time current signal of the target device meet the trigger condition, it is determined that the target device has a fault and an arc light protection mechanism is executed on the target device.

[0144] Exemplarily, in the determination module 206, when the real-time arc light signal and the real-time current signal of the target device meet the trigger condition, it is determined that the target device has a fault and an arc light protection mechanism is executed on the target device, including:

[0145] When the real-time current signal of the target device meets the combined criterion of the bimodal current mutation quantity and the real-time arc light signal of the target device meets the optical mutation criterion, the trigger condition is met, it is determined that the target device has a fault and an arc light protection mechanism is executed on the target device.

[0146] Exemplarily, the first criterion determination module 203 is specifically configured to:

[0147] Determine the original current mutation quantity based on the original sequence of the current signal;

[0148] Determine the original current mutation quantity criterion based on the original current mutation quantity;

[0149] Determine the differential current mutation quantity based on the differential sequence of the current signal;

[0150] Determine the differential current mutation quantity criterion based on the differential current mutation quantity;

[0151] Determine the combined criterion of the bimodal current mutation quantity based on the original current mutation quantity criterion and the differential current mutation quantity criterion.

[0152] Exemplarily, determining the combined criterion of the bimodal current mutation quantity based on the original current mutation quantity criterion and the differential current mutation quantity criterion includes:

[0153] Combining the original current mutation quantity criterion and the differential current mutation quantity criterion using the "OR" logic to form a single criterion;

[0154] The original current mutation criterion and the differential current mutation criterion are combined using the "AND" logic, and combined with the phase of the current mutation part to form a dual criterion;

[0155] Based on the single criterion and the dual criterion, a combined criterion of dual-mode current mutation is determined.

[0156] Exemplarily, the expression of the combined criterion of dual-mode current mutation is:

[0157]

[0158] Among them, a value of 1 for the first trigger condition indicates triggering the protection action of the current mutation, and a value of 0 for the first trigger condition indicates not triggering the protection action of the current mutation; ΔI raw is the original current mutation; 0.2I n is the threshold of the original current mutation; ΔI diff is the differential current mutation; 0.02I n is the threshold of the differential current mutation; θ is the phase of the current mutation part.

[0159] Exemplarily, the second criterion determination module 204 is specifically configured to:

[0160] Determine the optical mutation based on the arc light signal;

[0161] Determine the optical mutation criterion based on the optical mutation.

[0162] Exemplarily, the expression of the optical mutation criterion is:

[0163]

[0164] Among them, a value of 1 for the second trigger condition indicates triggering the optical mutation protection action, and a value of 0 for the second trigger condition indicates not triggering the optical mutation protection action; ΔP raw is the optical mutation; ΔP th is the absolute threshold of the optical mutation.

[0165] Exemplarily, in the preprocessing module 202, determining the original sequence and the differential sequence of the current signal based on the current signal includes:

[0166] Preprocess the current signal to obtain the original sequence of the current signal;

[0167] Determine the effective current characteristic information based on the original sequence of the current signal;

[0168] Use the effective current characteristic information to determine the differential sequence of the current signal.

[0169] Exemplarily, the expression of the differential current mutation is:

[0170]

[0171] Among them, ΔI diff (n) is the differential current mutation of the current signal at time n; is the difference sequence of the current signal at time n; is the difference sequence of the current signal at time n - 2.

[0172] For the beneficial effects of the optoelectronic fusion arc light rapid start-up device in this embodiment, reference can be made to the relevant descriptions in the above-mentioned optoelectronic fusion arc light rapid start-up method, which will not be elaborated here.

[0173] Refer to Figure 5 , an embodiment provides a controller, and the controller is used to execute the optoelectronic fusion arc light rapid start-up method in the above embodiment.

[0174] This application embodiment also provides a controller, refer to Figure 5 , the controller 300 may include: at least one processor 310 and a memory 320. A computer program that can run on at least one processor 310 is stored in the memory 320. When the processor 310 executes the computer program, the steps in any of the above method embodiments are implemented.

[0175] Exemplarily, the computer program may be divided into one or more modules / units. One or more modules / units are stored in the memory 320 and executed by the processor 310 to complete this application. One or more modules / units may be a series of computer program segments capable of completing specific functions, and the program segments are used to describe the execution process of the computer program in the controller 300.

[0176] Those skilled in the art can understand that Figure 5 is only an example of the controller, and does not constitute a limitation on the controller. It may include more or fewer components than shown in the figure, or combine some components, or different components, such as input / output devices, network access devices, buses, etc.

[0177] The processor 310 may be a Central Processing Unit (CPU), or may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0178] The memory 320 may be an internal storage unit of the controller or an external storage device of the controller, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a Flash Card, etc. The memory 320 is used to store computer programs and other programs and data required by the controller. The memory 320 may also be used to temporarily store data that has been output or is to be output.

[0179] The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For the sake of easy representation, the buses in the drawings of this application are not limited to only one bus or one type of bus.

[0180] The optoelectronic fusion-based arc rapid start method provided by the embodiments of this application can be applied to controllers such as computers, tablet computers, laptop computers, netbooks, personal digital assistants (PDAs), etc. The embodiments of this application do not impose any restrictions on the specific type of the controller.

[0181] The embodiments of this application provide an arc protection device, and the controller in the above embodiments is disposed inside the arc protection device.

[0182] The arc protection device is designed based on optoelectronic fusion technology and is specifically used for quickly and effectively protecting against arc phenomena.

[0183] The arc protection device processes the optoelectronic fusion information quickly. It analyzes the collected optoelectronic signals according to the pre-set algorithm through the built-in high-performance microprocessor. When the analysis result determines that an arc fault occurs, the device can quickly initiate the protection action. This protection action can be to cut off the faulty circuit to prevent the further expansion of the arc fault, avoid more serious damage to the equipment, and at the same time ensure the safe and stable operation of the entire power system. Moreover, the arc protection device also has a self-check function, which can regularly check the effectiveness of the optoelectronic sensors, circuit systems, and algorithms to ensure that the fast start protection operation can be accurately executed when an arc fault occurs.

[0184] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0185] In addition, although the operations of the method of the present application are described in a specific order in the drawings, this does not require or imply that these operations must be performed in that specific order, or that all the shown operations must be performed to achieve the desired result. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step for execution, and / or one step may be decomposed into multiple steps for execution.

[0186] The present application also provides a computer-readable storage medium, in which computer-executable instructions are stored. When the processor executes the computer-executable instructions, the fast start method for optoelectronic fusion arc provided in the above embodiments of the present application is implemented.

[0187] In the above embodiments, the descriptions of the various embodiments have their own emphases. For the parts not detailed or recorded in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0188] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. An arc rapid start method for optoelectronic integration, characterized in that, including acquiring the arc signal and current signal of the target device; determining the original sequence and differential sequence of the current signal based on the current signal; determining the combined criterion of dual-mode current mutation variables according to the original sequence and differential sequence of the current signal; determining the optical mutation criterion based on the arc signal; setting a trigger condition based on the combined criterion of dual-mode current mutation variables and the optical mutation criterion; acquiring the real-time arc signal and real-time current signal of the target device, and when the real-time arc signal and real-time current signal of the target device meet the trigger condition, determining that the target device has a fault and performing an arc protection mechanism on the target device.

2. The arc light rapid startup method of optoelectronic integration according to claim 1, characterized in that The step of, when the real-time arc signal and real-time current signal of the target device meet the trigger condition, determining that the target device has a fault and performing an arc protection mechanism on the target device includes: when the real-time current signal of the target device meets the combined criterion of dual-mode current mutation variables and the real-time arc signal of the target device meets the optical mutation criterion, the trigger condition is met, determining that the target device has a fault and performing an arc protection mechanism on the target device.

3. The arc light rapid start method of optoelectronic integration according to claim 1, characterized in that, The step of determining the combined criterion of dual-mode current mutation variables according to the original sequence and differential sequence of the current signal includes: determining the original current mutation variable based on the original sequence of the current signal; determining the original current mutation variable criterion based on the original current mutation variable; determining the differential current mutation variable based on the differential sequence of the current signal; determining the differential current mutation variable criterion based on the differential current mutation variable; determining the combined criterion of dual-mode current mutation variables based on the original current mutation variable criterion and the differential current mutation variable criterion.

4. The arc light rapid start method of optoelectronic integration according to claim 3, characterized in that, The step of determining the combined criterion of dual-mode current mutation variables based on the original current mutation variable criterion and the differential current mutation variable criterion includes: combining the original current mutation variable criterion and the differential current mutation variable criterion using an "OR" logic to form a single criterion; combining the original current mutation variable criterion and the differential current mutation variable criterion using an "AND" logic and combining with the phase of the current mutation part to form a dual criterion; determining the combined criterion of dual-mode current mutation variables based on the single criterion and the dual criterion.

5. The arc light rapid start method of optoelectronic integration according to claim 3, characterized in that, The expression of the combined criterion of dual-mode current mutation variables is: Among them, a value of 1 for the first trigger condition indicates triggering the protection action of the sudden change in current, and a value of 0 for the first trigger condition indicates not triggering the protection action of the sudden change in current; ΔI raw is the original sudden change in current; 0.2I n is the threshold of the original sudden change in current; ΔI diff is the differential sudden change in current; 0.02I n is the threshold of the differential sudden change in current; θ is the phase of the current mutation part.

6. The arc light rapid start method of optoelectronic integration according to claim 1, characterized in that, The step of determining the optical mutation criterion based on the arc signal includes: determining the optical mutation variable based on the arc signal; determining the optical mutation criterion based on the optical mutation variable.

7. The arc light rapid startup method of optoelectronic integration according to claim 6, characterized in that, The expression of the optical mutation criterion is: Among them, a value of 1 for the second trigger condition indicates triggering the optical mutation protection action, and a value of 0 for the second trigger condition indicates not starting the optical mutation protection action; ΔP raw is the optical mutation variable; ΔP th is the absolute threshold of the optical mutation variable.

8. The arc light rapid start method of optoelectronic integration according to claim 1, characterized in that, The step of determining the original sequence and differential sequence of the current signal based on the current signal includes: preprocessing the current signal to obtain the original sequence of the current signal; determining the effective current feature information based on the original sequence of the current signal; determining the differential sequence of the current signal using the effective current feature information.

9. The optoelectronic fusion-based arc rapid start method according to claim 3, characterized in that The expression of the differential current mutation variable is: Among them, ΔI diff (n) is the differential current mutation of the current signal at time n; is the differential sequence of the current signal at time n; is the differential sequence of the current signal at time n - 2.

10. An arc rapid start device integrating optoelectronics, characterized in that, The device for executing the optoelectronic fusion arc fast start method according to any one of claims 1 to 9 includes: a data acquisition module for acquiring the arc signal and current signal of the target device; A preprocessing module for determining an original sequence and a differential sequence of the current signal based on the current signal; A first criterion determination module for determining a combined criterion for dual-mode current mutation variables according to the original sequence and the differential sequence of the current signal; A second criterion determination module for determining a light mutation criterion based on the arc light signal; A trigger condition determination module for setting a trigger condition based on the combined criterion for dual-mode current mutation variables and the light mutation criterion; A determination module for obtaining a real-time arc light signal and a real-time current signal of a target device, and when the real-time arc light signal and the real-time current signal of the target device satisfy the trigger condition, determining that the target device has a fault and executing an arc light protection mechanism for the target device.

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