Fireproof current-limiting protector verification method and system

Abstract

The invention relates to the technical field of equipment detection, in particular to a fireproof current-limiting protector verification method and system. The method comprises the following steps: acquiring an initial time parameter of a to-be-tested fireproof current-limiting protector and electric signal waveform data in a current test process; based on the electric signal waveform data, identifying a test time parameter representing the response of the electronic current limiting unit; comparing the test time parameter with an initial time parameter to obtain a delay time difference value; and based on the delay time difference and a preset difference threshold, determining a verification result of the to-be-tested fireproof current-limiting protector. The objective of the invention is to solve the problem that the performance state of each monitoring unit in the fireproof current-limiting protector is difficult to accurately evaluate by the existing verification method.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of device detection, in particular to a fireproof current limiting protector verification method and system. BACKGROUND

[0002] As a precision protection device in the key power supply circuit, the core function of the fireproof current limiting protector is to quickly limit the fault current when a short circuit fault occurs, and to cut off the circuit almost without electric arc to achieve the purpose of fire prevention. However, the existing verification methods generally have limitations, usually only by external calibration device to input analog fault current, and according to the final pass current peak value and total breaking time and other macro indicators to judge whether the protector is qualified. The actual performance state of the internal first-stage electronic current limiting unit of the protector cannot be evaluated in depth.

[0003] When the performance of the electronic current limiting unit deteriorates due to long-term operation, its response speed may have slowed down significantly. For example, in the core power supply room of urban rail transit signal system, the fireproof current limiting protector bears the key mission of preventing sparks caused by electrical faults. The fireproof current limiting protector quickly intervenes by the electronic current limiting unit at the initial stage of the fault to suppress the current growth, and then quickly and completely cuts off the circuit by the electronic switch. However, in routine calibration, even if the fireproof current limiting protector shows qualified on the surface, the core components of the internal electronic current limiting unit may have experienced unnoticeable capacity decay due to long-term service, resulting in a slower response speed. The delay in response speed allows the short-circuit current to rise for a longer time before being suppressed, increasing the time required for the subsequent electronic switch to completely disconnect the circuit. Therefore, it is difficult for maintenance personnel to accurately determine whether the fireproof current limiting protector has hidden dangers. The existing verification method cannot accurately evaluate the performance state of each monitoring unit in the fireproof current limiting protector, and cannot timely perform state early warning on the fireproof current limiting protector. SUMMARY

[0004] The purpose of the present application is to provide a fireproof current limiting protector verification method and system, which solves the problem that the existing verification method cannot accurately evaluate the performance state of each monitoring unit in the fireproof current limiting protector.

[0005] To achieve the above purpose, the present application adopts the following technical scheme: a fireproof current limiting protector verification method, comprising: obtaining the initial time parameter of the fireproof current limiting protector to be tested and the electrical signal waveform data in the current test process; based on the electrical signal waveform data, identifying a test time parameter representing the response of the electronic current limiting unit; comparing the test time parameter with the initial time parameter to obtain a delay time difference; determine a verification result of the to-be-tested fireproof current limiting protector based on the delay time difference value and a preset difference threshold value.

[0006] Optionally, the step of obtaining the initial time parameter of the to-be-tested fireproof current limiting protector comprises: collecting initial waveform data of the to-be-tested fireproof current limiting protector under standard fault simulation test; filtering the electric signal in the initial waveform data to obtain a high-frequency electric signal component associated with starting of the electronic current limiting unit; determining the initial time parameter based on the high-frequency electric signal component and a preset component threshold value.

[0007] Optionally, in the step of determining the initial time parameter based on the high-frequency electric signal component and a preset component threshold value, the preset component threshold value is constructed by: obtaining a background high-frequency current component in a preset period; dividing the background high-frequency current component in the preset period into multiple segments and confirming a background energy value in each time segment; confirming, based on the background energy value in each time segment, a statistical quantity representing discrete degree of the background energy value that meets a preset stable condition; taking the background energy values of all time segments corresponding to the statistical quantity representing discrete degree of the background energy value that meets the preset stable condition as the preset component threshold value.

[0008] Optionally, after the step of determining the verification result of the to-be-tested fireproof current limiting protector based on the delay time difference value and a preset difference threshold value, the method further comprises: obtaining a historical time parameter of the to-be-tested fireproof current limiting protector between the test time parameter and the initial time parameter, a first time interval parameter tested between the initial time parameter and the historical time parameter, and a second time interval parameter tested between the test time parameter and the historical time parameter; determining a first response time change rate and a second response time change rate based on the initial time parameter, the historical time parameter, the first time interval parameter, the test time parameter and the second time interval parameter; comparing the first response time change rate with the second response time change rate to determine a degradation result of the fireproof current limiting protector.

[0009] Optionally, the step of determining the first response time change rate and the second response time change rate based on the initial time parameter, the historical time parameter, the first time interval parameter, the test time parameter and the second time interval parameter comprises: The initial time parameter, the historical time parameter and the first time interval parameter determine a first response time change rate; Based on the historical time parameter, the test time parameter and the second time interval parameter, a second response time change rate is determined.

[0010] Optionally, the application also proposes a step of comparing the first response time change rate with the second response time change rate to determine the degradation result of the fireproof current limiting protector, which further comprises: Obtaining a preset risk level of a circuit where the fireproof current limiting protector to be tested is located; Based on the preset risk level, selecting a determination standard corresponding to the preset risk level from a plurality of preset determination standards; After comparing the first response time change rate with the second response time change rate, the determination standard comparison result is used to determine the degradation result of the fireproof current limiting protector.

[0011] Optionally, the application also proposes a step of comparing the first response time change rate with the second response time change rate to determine the degradation result of the fireproof current limiting protector, which further comprises: Comparing the first response time change rate with the second response time change rate to determine a degradation trend score; Using the determination standard to determine a degradation trend score threshold corresponding to the risk level; Comparing the degradation trend score with the degradation trend score threshold to determine the degradation result of the fireproof current limiting protector.

[0012] Optionally, the application also proposes a step of collecting initial waveform data of the fireproof current limiting protector to be tested under standard fault simulation test, which further comprises: Clock synchronization is performed on a plurality of electric signal probes for collecting the fireproof current limiting protector to be tested under standard fault simulation test; Synchronous collection of the fireproof current limiting protector to be tested is performed by using the plurality of electric signal probes to confirm the original waveform data; The original waveform data is filtered to obtain the initial waveform data.

[0013] Optionally, the application also proposes a step of identifying a test time parameter representing the response of the electronic current limiting unit based on the electric signal waveform data, which further comprises: First-order differential processing is performed on the electric signal waveform data to obtain an electric signal change rate curve; The time point when the electric signal change rate curve first drops from the initial platform peak region to 20% of the peak value is selected as the test time parameter representing the response of the electronic current limiting unit.

[0014] The application also provides a fireproof current-limiting protector verification system for executing the fireproof current-limiting protector verification method. The acquisition module is configured to acquire an initial time parameter of the to-be-tested fireproof current-limiting protector and electrical signal waveform data in a current test process. The identification module is configured to identify a test time parameter representing the response of the electronic current-limiting unit based on the electrical signal waveform data. The comparison module is configured to compare the test time parameter with the initial time parameter to obtain a delay time difference. The determination module is configured to determine a verification result of the to-be-tested fireproof current-limiting protector based on the delay time difference and a preset difference threshold.

[0015] Compared with the prior art, the fireproof current-limiting protector verification method and system have the following advantages. The application acquires an initial time parameter of the to-be-tested fireproof current-limiting protector as a reference of the response speed of the electronic current-limiting unit in an ideal or healthy state. Meanwhile, the system acquires electrical signal waveform data of the to-be-tested protector in a current test process, and the data contains detailed electrical characteristics of the electronic current-limiting unit in actual operation. Based on the electrical signal waveform data, a test time parameter representing the response of the electronic current-limiting unit is further identified, reflecting the actual response speed of the electronic current-limiting unit under the current test condition. Then, the identified test time parameter is compared with the initially acquired initial time parameter, so as to obtain a delay time difference, directly quantifying the deviation degree of the response speed of the electronic current-limiting unit relative to the initial reference. Finally, by comparing the delay time difference with a preset difference threshold, the verification result of the to-be-tested fireproof current-limiting protector can be accurately determined. If the delay time difference exceeds the preset difference threshold, it indicates that the response speed of the electronic current-limiting unit has been delayed unacceptably, so that a warning can be sent in time to avoid potential fire hazards caused by the performance degradation of the electronic current-limiting unit. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present application, the drawings required in the specific embodiments will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0017] Figure 1 The flowchart of the fireproof current-limiting protector verification method of the present application.

[0018] Figure 2 The structural block diagram of the fireproof current-limiting protector verification system of the present application.

[0019] In the figure: 210, acquisition module; 220, identification module; 230, comparison module; 240, determination module.

[0020] The implementation of the functions and advantages of the present application will be further described with reference to the embodiments in conjunction with the accompanying drawings. DETAILED DESCRIPTION

[0021] In the following, a plurality of embodiments of the present application will be disclosed with reference to the drawings. For the purpose of clear illustration, a number of practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit the present application. That is, in some embodiments of the present application, these practical details are not necessary. In addition, for the purpose of simplifying the drawings, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0022] It should be noted that all directional references (such as upper, lower, left, right, front, rear, etc.) used herein are only used for explaining the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional references will also change accordingly.

[0023] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description, and is not particularly intended to indicate the order or sequence, nor is it intended to limit the present application. It is merely for the purpose of distinguishing components or operations described by the same technical terms, and cannot be understood as indicating or implying the relative importance of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of a person skilled in the art. When the combination of technical solutions appears to be contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.

[0024] The conventional existing fireproof current limiting protector verification method usually relies on the pass-through current peak value and total breaking time and other results when evaluating its performance. The existing verification method has a blind area and cannot independently evaluate the performance status of the first stage electronic current limiting link inside the protector. When the response speed of the electronic current limiting unit slows down due to degradation, the subsequent mechanical disconnection part completes the breaking task by relying on the design margin, so that the indicators are still within the qualified range, thereby causing inaccurate qualification. The inaccurate judgment covers up the decline of the fireproof performance of the protector, and there is a risk of causing a fire hazard under fault conditions.

[0025] In order to further understand the content, characteristics and effects of the present application, the following embodiments are exemplified and described in detail as follows in conjunction with the drawings: Please refer toFigure 1 The application provides a fireproof current-limiting protector verification method, comprising the following steps: S100, obtaining initial time parameters of a to-be-tested fireproof current-limiting protector and electrical signal waveform data in a current test process. The initial time parameters are reference time points or time values of internal electronic current-limiting unit response actions of the to-be-tested fireproof current-limiting protector in a standard or ideal working state, which can be obtained by processing initial waveform data collected under standard fault simulation tests of the protector, for example, by filtering, high-frequency component analysis and the like, to provide a reference benchmark for subsequent performance comparison, so as to evaluate whether the performance of the protector changes. The electrical signal waveform data are continuous signal records reflecting internal current or voltage changes of the to-be-tested fireproof current-limiting protector collected by sensors or probes in the current test process, which can be sampled in real time by using high-speed data acquisition equipment to provide original data basis for analyzing the response behavior of the electronic current-limiting unit.

[0026] S200, identifying test time parameters representing the response of the electronic current-limiting unit based on the electrical signal waveform data. The test time parameters representing the response of the electronic current-limiting unit are specific time points or time values that can accurately indicate that the internal electronic current-limiting unit of the fireproof current-limiting protector starts to intervene and play a current-limiting role under the current test condition, which can be obtained by using methods such as feature point identification and change rate analysis of the waveform data, and then quantifying the response speed of the electronic current-limiting unit in the actual test.

[0027] S300, comparing the test time parameters with the initial time parameters to obtain a delay time difference value. The delay time difference value is the numerical difference between the test time parameters identified in the current test process and the initial time parameters, to directly quantify the deviation degree of the response speed of the electronic current-limiting unit relative to the reference state.

[0028] S400, determining a verification result of the to-be-tested fireproof current-limiting protector based on the delay time difference value and a preset difference value threshold. The preset difference value threshold is a preset standard value for judging whether the delay time difference value is within an acceptable range when determining the verification result, which can be set according to the design specification, safety requirement or historical operation data analysis of the protector, to provide an objective judgment limit to distinguish the qualified and unqualified performance states.

[0029] Specifically, when the fireproof current limiting protector is first installed or shipped, a standard fault simulation test is performed thereon, and a high-precision oscilloscope or a high-speed data acquisition card is used to collect the electrical signal waveform of the fireproof current limiting protector under the standard fault simulation test. After signal processing, such as high-pass filtering and feature point recognition, the initial time parameter of the fireproof current limiting protector can be determined and stored as a performance benchmark of the fireproof current limiting protector. In the subsequent in-service verification process, a detection-specific simulation fault signal is applied to the power supply end of the fireproof current limiting protector to be tested, and a reserved interface of the fireproof current limiting protector is connected to a connector. The electrical signal waveform data of the fireproof current limiting protector during the simulation signal implementation process is collected in real time, and the data is converted into digital signals by an analog-to-digital converter. Then, the collected electrical signal waveform data is analyzed by using the upper computer software, the first-order difference of the waveform is calculated, and the time point when the electrical signal change rate curve first drops from the initial plateau peak region to 20% of the peak value is identified as the test time parameter representing the response of the electronic current limiting unit. Subsequently, the processor compares the test time parameter identified at present with the initial time parameter stored, and calculates the delay time difference between the two. Finally, the processor compares the calculated delay time difference with a preset difference threshold value, which can be pre-stored in the memory of the device, for example, set to 50 microseconds. If the delay time difference exceeds the preset difference threshold value, the system determines that the verification result of the fireproof current limiting protector to be tested is unqualified, and can directly display the corresponding alarm or prompt information.

[0030] The present application solves the problem that the traditional verification method cannot effectively detect the performance degradation of the fireproof current limiting protector by performing fine performance evaluation on the core electronic current limiting unit of the fireproof current limiting protector. Specifically, the initial time parameter of the fireproof current limiting protector to be tested is first obtained, which serves as a benchmark for the response speed of the electronic current limiting unit of the protector in an ideal or healthy state. At the same time, the electrical signal waveform data of the fireproof current limiting protector to be tested is collected during the current test, which contains detailed electrical characteristics of the electronic current limiting unit in actual operation. Based on the electrical signal waveform data, the test time parameter representing the response of the electronic current limiting unit is identified, which reflects the actual response speed of the electronic current limiting unit under the current test condition. The identified test time parameter is compared with the pre-obtained initial time parameter to obtain a delay time difference, which directly quantifies the deviation of the response speed of the electronic current limiting unit from its initial benchmark. By comparing the delay time difference with a preset difference threshold value, the verification result of the fireproof current limiting protector to be tested can be determined, and the performance status of each monitoring unit in the fireproof current limiting protector can be accurately evaluated. If the delay time difference exceeds the preset difference threshold value, it indicates that the response speed of the electronic current limiting unit has been delayed to an unacceptable extent, thereby timely issuing a warning and avoiding potential fire hazards caused by performance degradation of the electronic current limiting unit.

[0031] Based on some of the above embodiments, the application also proposes that the step of obtaining the initial time parameter of the fireproof current limiting protector under test comprises: Collecting initial waveform data of the fireproof current limiting protector under test under standard fault simulation test. The standard fault simulation test is to apply a specific current or voltage waveform to the fireproof current limiting protector to trigger the response of its electronic current limiting unit by simulating actual short circuit fault or overload condition, which can be achieved by injecting a transient large current pulse or a step voltage signal to obtain the response data of the protector under controlled conditions. The initial waveform data is the original time domain signal representing the electrical response of the fireproof current limiting protector collected by sensors or probes during the standard fault simulation test, including current waveform, voltage waveform or their combination, which provides basic data for subsequent parameter extraction.

[0032] Filtering the electrical signals in the initial waveform data to obtain high-frequency electrical signal components associated with the start of the electronic current limiting unit. The filtering process is to process the collected electrical signals to remove irrelevant noise, interference or low-frequency components, highlight high-frequency features related to specific events, which can be achieved by using digital filters, analog filters or adaptive filtering algorithms to improve the signal-to-noise ratio of the signal and facilitate accurate identification of key events. The high-frequency electrical signal component is the signal part with relatively high frequency extracted from the original electrical signal after filtering, and the high-frequency signal is usually closely related to the fast switching action or transient response of the internal semiconductor devices of the electronic current limiting unit, which can be manifested as current or voltage spikes, oscillations or fast rising edges, as a direct basis for determining the starting time of the electronic current limiting unit.

[0033] Based on the high-frequency electrical signal component and the preset component threshold, the initial time parameter is determined. The preset component threshold is a numerical limit for determining whether the high-frequency electrical signal component meets the starting condition of the electronic current limiting unit, which can be determined according to the design parameters, historical performance data or statistical analysis results of the protector, in order to exclude incidental noise interference and ensure the accuracy and reliability of the initial time parameter determination.

[0034] Specifically, the fireproof current-limiting protector to be tested is connected to a dedicated fault simulation test platform. The platform can configure a programmable current source to inject a simulated short-circuit current pulse with a steep rising edge in a very short time (e.g., microseconds) to simulate the transient impact when an actual fault occurs. At the same time of current injection, a high sampling rate such as a digital oscilloscope or data acquisition card with millions of samples per second is used to synchronously collect the current and voltage waveforms in the protector loop through current probes or voltage probes, and the originally collected data are initial waveform data. The initial waveform data are input to a signal processing unit, which can run a digital high-pass filter such as a Butterworth filter or Chebyshev filter with a cutoff frequency set at hundreds of kilohertz to filter the electrical signals. The purpose of filtering is to remove power frequency interference and low-frequency noise and only retain high-frequency components related to the fast switching action of the electronic current-limiting unit, so as to obtain high-frequency electrical signal components. When the IGBT or MOSFET in the electronic current-limiting unit is rapidly turned off, a significant voltage or current spike will be generated, which belongs to the high-frequency electrical signal component. The signal processing unit continuously monitors the high-frequency electrical signal component and compares it with a preset component threshold. The threshold can be a reference value determined by statistical analysis based on a large amount of healthy protector test data, and when the amplitude of the high-frequency electrical signal component first exceeds the threshold, the time point at this moment is recorded as the initial time parameter. Further, it can be ensured that the determined initial time parameter is an accurate reflection of the real start of the electronic current-limiting unit, rather than being affected by environmental noise or measurement errors.

[0035] In the embodiment, when the initial time parameter of the fireproof current-limiting protector to be tested is obtained, the noise interference can be effectively removed and the real start time of the electronic current-limiting unit can be accurately captured by filtering the initial waveform data and determining based on the high-frequency electrical signal component and the preset component threshold, so that a more accurate and reliable initial time parameter is obtained. The accuracy of the subsequent verification result is significantly improved, false judgments caused by inaccurate initial parameters are avoided, and the evaluation of the performance decay of the fireproof current-limiting protector is more accurate, thereby providing reliable data support for early warning and maintenance of the equipment.

[0036] Based on some of the above embodiments, the application further proposes that in the step of determining the initial time parameter based on the high-frequency electrical signal component and the preset component threshold, the construction step of the preset component threshold comprises: Obtaining a background high-frequency current component in a preset period.

[0037] The background high-frequency current component in the preset period is divided into multiple segments, and the background energy value in each time segment is confirmed. The background energy value is the energy size contained by the background high-frequency current component in a specific time segment, which can be obtained by squaring and integrating the current signal in the time segment or by calculating the root mean square value. The purpose is to quantify the intensity of background noise and provide basic data for subsequent stability analysis.

[0038] Based on the background energy value in each time segment, a statistical quantity representing the dispersion degree of the background energy value that meets the preset stability condition is confirmed. The preset stability condition is a criterion for judging whether the background noise is in a stable state in a specific time period. Specifically, it can be a preset threshold value. When the statistical quantity representing the dispersion degree of the background energy value is less than the threshold value, it is considered that the background noise is stable. The purpose is to screen out time segments with less fluctuation and relatively pure background noise to ensure the reliability of the threshold value constructed subsequently.

[0039] The background energy values of all time segments corresponding to the statistical quantity representing the dispersion degree of the background energy value that meets the preset stability condition are taken as the preset component threshold value. The statistical quantity representing the dispersion degree of the background energy value is a mathematical quantity for measuring the fluctuation degree of the background energy value between different time segments, which can be standard deviation, variance, mean absolute deviation, or interquartile range. The purpose is to quantify the stability of the background noise and identify time periods with less interference and which can be used to construct accurate threshold values.

[0040] Specifically, before the fire-proof current-limiting protector is calibrated, or during a specific idle period during the calibration process, a high-precision current sensor is used to collect background high-frequency current components for a preset period, such as 10 seconds. This high-frequency current component is extracted from the original current signal using a bandpass filter with a cutoff frequency between 10 kHz and 1 MHz. Subsequently, the 10-second background high-frequency current component data is divided into multiple consecutive, equal-length time segments, for example, each segment lasting 10 milliseconds. For each 10-millisecond time segment, a background energy value is determined. This is obtained by performing a Fourier transform on the current signal within the segment and then calculating the energy spectral density of the high-frequency component, or by directly calculating the root mean square value of the current signal within the segment. Next, based on the calculated background energy values ​​for each 5-millisecond time segment, a statistic representing the degree of dispersion of the background energy values ​​is determined to meet a preset stability condition. For example, the standard deviation of the background energy values ​​between adjacent time segments can be calculated. The preset stability condition can be set as follows: when the standard deviation of the background energy values ​​for five consecutive time segments is less than a preset small threshold (for example, 0.05 unit energy value), the background noise in those time segments is considered stable. Finally, the background energy values ​​for all time segments that meet the aforementioned stability conditions are combined, and the average or maximum value of these energy values ​​is calculated. This average or maximum value is used as the final preset component threshold. This threshold is then used in the subsequent initial time parameter determination step to accurately identify the activation time of the electronic current limiting unit.

[0041] In this embodiment, by performing segmented analysis and stability assessment of the background high-frequency current component, background noise is effectively distinguished from the valid signal generated by the activation of the electronic current-limiting unit, significantly reducing the interference of background noise on the determination of the initial time parameters. This improves the accuracy of the initial time parameter determination, thereby enhancing the overall accuracy and reliability of the fire-proof current-limiting protector verification, avoiding false acceptance or misjudgment caused by noise interference, and ensuring a true assessment of the protector's core fire protection performance.

[0042] Based on some of the above embodiments, the present application further proposes that after the step of determining the verification result of the fire-proof current-limiting protector to be tested based on the delay time difference and the preset difference threshold, the method further includes: The initial time parameter, the historical time parameter, the first time interval parameter, the test time parameter and the second time interval parameter are used to determine the first response time change rate and the second response time change rate. The historical time parameter is the response time parameter of the electronic current limiting unit recorded by the tested fireproof current limiting protector at a certain time point in the past, which can be obtained by using the historical test data stored in the internal memory or external database of the device, so as to provide a reference point for evaluating the change of the performance of the protector over time. The first time interval parameter is the time span between the initial time parameter and the historical time parameter, which can be calculated by using the test date or time stamp recorded by the system, so as to quantify the time interval between the initial performance and the historical performance.

[0043] Based on the initial time parameter, the historical time parameter, the first time interval parameter, the test time parameter and the second time interval parameter, the first response time change rate and the second response time change rate are determined. The second time interval parameter is the time span between the test time parameter and the historical time parameter, which can be calculated by using the current test date or time stamp and the historical test date or time stamp recorded by the system, so as to quantify the time interval between the current performance and the historical performance. The first response time change rate refers to the change degree of the response time of the fireproof current limiting protector between the initial time parameter and the historical time parameter, which can be calculated by using the ratio of the response time difference value to the corresponding time interval, so as to represent the performance degradation trend of the protector in the early stage. The second response time change rate refers to the change degree of the response time of the fireproof current limiting protector between the historical time parameter and the test time parameter, which can be calculated by using the ratio of the response time difference value to the corresponding time interval, so as to represent the performance degradation trend of the protector in the recent stage. The degradation result is an evaluation conclusion of the performance degradation of the fireproof current limiting protector, which can be represented by qualitative or quantitative indicators such as no degradation, slight degradation, degradation or replacement, so as to provide a decision basis for the maintenance, repair or replacement of the protector.

[0044] The first response time change rate and the second response time change rate are compared to determine the degradation result of the fireproof current limiting protector.

[0045] Specifically, it is assumed that the initial time parameter measured when the tested fireproof current limiting protector is shipped is T0, and the test time parameter measured in the current test is T t To evaluate its degradation, the system first obtains the historical time parameter T h measured by the protector at a certain time point in the past (for example, at the last annual verification) from the stored historical record. At the same time, the system records the time interval from T0 to T h is Δt1, and the time interval from Th to T t The time interval is Δt2. These time parameters and time interval parameters can be stored and retrieved by a data management module, which can be an embedded storage unit or a cloud database connected to the verification device. Next, the system calculates the first response time change rate and the second response time change rate. The first response time change rate can be calculated as (T h -T0) / Δt1, indicating the response time change speed from factory to historical time. The second response time change rate can be calculated as (T t - T h ) / Δt2, indicating the response time change speed from historical time to current test time. These calculations can be performed by a processor inside the verification device or connected analysis software. Subsequently, the system compares the calculated first response time change rate with the second response time change rate. For example, if the second response time change rate is greater than the first response time change rate and exceeds a degradation acceleration threshold, it can be judged that the protector has an accelerated degradation trend. If the second response time change rate is similar to the first response time change rate, it may indicate stable performance changes. If the second response time change rate is less than the first response time change rate, it may indicate that the performance has improved or fluctuated. Finally, according to the comparison result, the system can output a degradation result, such as slight degradation. The degradation result can be displayed on the screen of the verification device, or sent to the maintenance personnel through the network, so that they can make corresponding maintenance plans according to this information.

[0046] In this embodiment, by obtaining the historical time parameters and the time interval parameters between different time points, and calculating the response time change rates at different stages based on these data, the degradation degree and trend of the protector performance over time can be quantified and judged. The verification is no longer limited to a single pass or fail judgment, but can reveal the performance degradation problem of the protector, thereby realizing the evaluation of the safety performance of the fireproof current limiting protector, providing data support for preventive maintenance and timely replacement of the device, and reducing the safety risks caused by the performance degradation of the device.

[0047] Based on some of the above embodiments, the application further proposes a step of determining a first response time change rate and a second response time change rate based on the initial time parameter, the historical time parameter, the first time interval parameter, the test time parameter, and the second time interval parameter, comprising: The initial time parameter, the historical time parameter and the first time interval parameter determine a first response time change rate. The first response time change rate is a degree of change of the response time of the fireproof current limiting protector between the initial time parameter and the historical time parameter, which can be calculated by a ratio of the response time difference value to the corresponding time interval, to represent the performance degradation trend of the protector in the early stage.

[0048] Based on the historical time parameter, the test time parameter and the second time interval parameter, a second response time change rate is determined. The second response time change rate is a change rate of the response time of the fireproof current limiting protector during the period from the historical state to the current test state, which can be calculated by dividing the difference between the historical time parameter and the test time parameter by the second time interval parameter, to reflect the performance degradation of the protector in the recent period.

[0049] In this embodiment, the calculation process of the response time change rate is refined into two independent stages, thereby realizing the accurate quantification of the performance degradation degree of the fireproof current limiting protector. The first response time change rate is confirmed by using the initial time parameter, the historical time parameter and the first time interval parameter. The long-term performance evolution of the protector from its factory or best performance state to a certain historical time point is based on. The initial time parameter serves as the performance benchmark, the historical time parameter serves as the intermediate performance snapshot, and the first time interval parameter provides the time span, so that the average degradation rate of the protector in a longer use cycle can be accurately calculated. It helps to identify whether the protector has a slow but continuous performance decline. Secondly, the second response time change rate is confirmed based on the historical time parameter, the test time parameter and the second time interval parameter. The focus is on the short-term performance change of the protector from the last historical record to the current test time. The historical time parameter serves as the reference point of the recent performance, the test time parameter reflects the real-time performance of the protector, and the second time interval parameter quantifies the shorter time span. It can timely capture the accelerated degradation or sudden performance decline of the protector in the near future. The first response time change rate reveals the long-term health trend of the protector, and the second response time change rate reflects its current active degradation state. The segmented calculation avoids the information loss or misjudgment that may be caused by a single change rate, for example, if a protector has a slow long-term degradation but suddenly accelerates in the near future, a single long-term change rate may not be able to provide timely warning, and the second response time change rate can quickly capture this change. Conversely, if the recent performance is stable but the long-term trend is poor, the first response time change rate can also provide the necessary warning. Further, a complete performance degradation evaluation chain is formed. Obtaining these parameters provides a data basis for subsequent accurate calculation, and the present scheme converts these raw data into quantitative indicators with practical significance. The degradation evaluation of the fireproof current limiting protector is improved from a simple pass or fail judgment to a level capable of quantifying the degradation degree and predicting the remaining life, thereby providing a more reliable and fine basis for maintenance and replacement decisions, effectively solving the problem that only a qualitative conclusion of degradation is insufficient to accurately evaluate the remaining life and maintenance needs of the protector.

[0050] Based on some of the above embodiments, the present application also proposes comparing the first response time change rate with the second response time change rate, and determining the degradation result of the fireproof current limiting protector. The step further comprises: Obtaining a preset risk level of a circuit where the to-be-tested fireproof current limiting protector is located. The preset risk level is a different safety level of the circuit divided according to importance of the circuit, loss degree caused by failure and requirement for power supply continuity, etc. The preset risk level can be realized by a grading system, such as being divided into high risk, medium risk and low risk, or by a numerical quantification method, to provide differentiated judgment basis for the degradation evaluation of the protector of different circuits.

[0051] Based on the preset risk level, selecting a judgment standard corresponding to the preset risk level from a plurality of preset judgment standards. The plurality of preset judgment standards are one or more sets of rules or threshold values for judging the degradation of the fireproof current limiting protector, which are pre-set for different preset risk levels. The plurality of preset judgment standards can be realized by a table, a database or an algorithm model, wherein each standard corresponds to a specific risk level, and provides customized degradation judgment basis for circuits of different risk levels.

[0052] After comparing the first response time change rate and the second response time change rate, the comparison result of the judgment standard is used for judgment to determine the degradation result of the fireproof current limiting protector. Specifically, the comparison result of the judgment standard is a judgment conclusion obtained by comparing the first response time change rate and the second response time change rate with the selected judgment standard. The comparison result of the judgment standard can be realized by logical judgment, numerical comparison or interval matching, etc. The response time change rate and the circuit risk level are comprehensively considered to obtain a more accurate degradation evaluation.

[0053] Specifically, the application is implemented as follows. After the calculation of the response time change rate of the protector is completed, it is necessary to determine its degradation result. First, the preset risk level of the circuit connected to the fireproof current limiting protector to be tested is obtained by interacting with the device management system or asset management database. For example, if the protector is connected to the power supply circuit of the core server of the data center, its preset risk level can be marked as high risk. If it is connected to the ordinary socket circuit of the office area, it can be marked as low risk. The system internally pre-stores multiple preset determination standards in the form of a rule set, for example: for high-risk level circuits, the determination standard can be set as: if the second response time change rate exceeds 5% of the first response time change rate, it is determined to be degraded. For medium-risk level circuits, the determination standard can be set as: if the second response time change rate exceeds 10% of the first response time change rate, it is determined to be degraded; for low-risk level circuits, the determination standard can be set as: if the second response time change rate exceeds 15% of the first response time change rate, it is determined to be degraded. When the high-risk level is obtained, it will select the corresponding high-risk determination standard. Then, the first response time change rate and the second response time change rate that have been calculated are compared, such as the second response time change rate is 7.5% higher than the first response time change rate. At this time, the selected high-risk determination standard (i.e. the threshold of 5%) is used for comparison and judgment. Since 7.5% exceeds the threshold of 5%, it is determined that the fireproof current limiting protector has degraded, and the corresponding maintenance or replacement warning can be triggered. Even a relatively small performance degradation can be identified in time in a high-risk scenario, ensuring the safe operation of critical circuits.

[0054] In this embodiment, when determining the degradation result of the fireproof current limiting protector, the actual risk level of the circuit where it is located can be fully considered, avoiding the one-sidedness of single standard judgment. The evaluation of the performance of the protector is more refined and targeted, especially in application environments with extremely high requirements for power supply continuity and safety, more accurate degradation warnings can be achieved, thereby effectively reducing the potential risks caused by the degradation of the performance of the protector, and ensuring the reliability of the circuit operation.

[0055] Based on some of the above embodiments, the application also proposes a step of determining the degradation result of the fireproof current limiting protector by using the determination standard to compare the result after comparing the first response time change rate with the second response time change rate, comprising: comparing the first response time change rate with the second response time change rate to determine a degradation trend score. The degradation trend score is a quantitative value obtained by comparing the first response time change rate with the second response time change rate, reflecting the change trend and degradation degree of the response speed of the fireproof current limiting protector, which can be calculated using various mathematical models or algorithms; for example, it can be the difference, ratio or comprehensive index based on the change rate curve characteristics of the two change rates, to convert the degradation of the protector into a quantifiable index.

[0056] using a determination criterion to determine a degradation trend score threshold corresponding to the risk level. The determination criterion refers to a set of rules or criteria for evaluating the degradation result of the fireproof current limiting protector, which can include a series of logical judgment conditions, threshold settings or decision tree models, providing a basis for the judgment of the degradation result. The risk level is a classification of the importance of the circuit in which the fireproof current limiting protector is located or the degree of harm that may be caused by its failure, which can be divided according to factors such as the application scenario of the circuit, the type of load, the requirement for power supply continuity and potential safety hazards; for example, it can be divided into high risk, medium risk and low risk levels to distinguish the differences in performance requirements of the protector in different application scenarios.

[0057] comparing the degradation trend score with the degradation trend score threshold to determine the degradation result of the fireproof current limiting protector. The degradation trend score threshold is a critical value corresponding to a specific risk level in the determination criterion, used to judge whether the degradation trend score has reached or exceeded an acceptable degree of degradation, which can be set according to historical data, industry standards or expert experience, and dynamically adjusted according to different risk levels, to provide a quantitative judgment limit, ensuring the accuracy and applicability of the evaluation.

[0058] Based on the above some embodiments, the present application also proposes a step of collecting initial waveform data of the fireproof current limiting protector under standard fault simulation test, which includes: synchronizing the clocks of the multiple electrical signal probes for collecting the fireproof current limiting protector under standard fault simulation test. The multiple electrical signal probes are sensor devices for simultaneously measuring different types of electrical signals at different positions of the fireproof current limiting protector under standard fault simulation test, which can be implemented using current probes, voltage probes or optical fiber sensors, etc. Clock synchronization is to ensure that the internal timing references of the multiple electrical signal probes remain consistent or have a calibratable time offset when collecting data, which can be implemented using global clock signal distribution, time stamp calibration or phase-locked loop, etc., to eliminate the time errors introduced by clock drift or delay between different probes.

[0059] The original waveform data is filtered to obtain initial waveform data. The initial waveform data is waveform data that, after filtering, removes noise and interference and can more accurately reflect the true electrical signal characteristics of the fireproof current limiting protector under standard fault simulation testing, and can be used as a reliable basis for subsequent analysis and parameter determination.

[0060] The original waveform data is filtered to obtain initial waveform data. The initial waveform data is waveform data that, after filtering, removes noise and interference and can more accurately reflect the true electrical signal characteristics of the fireproof current limiting protector under standard fault simulation testing, and can be used as a reliable basis for subsequent analysis and parameter determination.

[0061] In this embodiment, by finely processing the collected electrical signal data of the fireproof current limiting protector under standard fault simulation testing, the accuracy and reliability of the initial waveform data are ensured. First, the multiple electrical signal probes are clock-synchronized, solving the problem of inconsistent time reference in multi-channel measurement and ensuring the alignment of all collected electrical signal data on the time axis. It is precisely because of this accurate time alignment that subsequent synchronous collection using multiple electrical signal probes can obtain highly consistent and comprehensive original waveform data, avoiding waveform distortion or information loss due to time deviation. On this basis, the original waveform data is filtered to effectively remove the inevitable noise and interference during the collection process, allowing the high-frequency electrical signal components related to the start of the electronic current limiting unit to be clearly presented. The obtained initial waveform data has a higher signal-to-noise ratio and accuracy. The high-quality initial waveform data is directly used as a reliable input for subsequent determination of the initial time parameter. Since the time accuracy and purity of the initial waveform data are improved, the initial time parameter determined based on it will be more accurate. The accuracy of the initial time parameter is crucial for comparing the test time parameter with the initial time parameter to obtain the delay time difference and ultimately determine the verification result of the fireproof current limiting protector. Therefore, this scheme improves the reliability of the verification process from the data source, making the evaluation of the performance of the fireproof current limiting protector more accurate and effectively solving the problem of verification result deviation caused by inaccurate original waveform data, thereby providing a solid data foundation for the long-term safe operation of the fireproof current limiting protector.

[0062] Based on some of the above embodiments, the application further proposes a step of identifying a test time parameter representing the response of the electronic current limiting unit based on the electrical signal waveform data, comprising: The electrical signal waveform data is subjected to first-order difference processing to obtain an electrical signal rate of change curve. The first-order difference processing is a difference calculation between adjacent data points of continuous or discrete electrical signal waveform data to obtain the rate of change of the signal over time, which can be realized by numerical differentiation algorithm or digital filter. The purpose is to highlight the transient change characteristics of the signal, and to convert the flat part in the original signal into a change rate close to zero, and to convert the rapidly changing area into obvious peaks or valleys, so as to clearly reveal the starting point of the response of the electronic current limiting unit.

[0063] The time point when the electrical signal rate of change curve first drops to 20% of the peak value from the initial plateau peak area is selected as the test time parameter representing the response of the electronic current limiting unit. The initial plateau peak area is a relatively stable and continuous high value area formed after the electronic current limiting unit starts to respond due to its rapid intervention. This area can be a flat peak or a wide peak, because it reflects that the current or voltage rate of change reaches and maintains a high level at the initial stage of the current limiting action. The time point of 20% of the peak value is the corresponding time point when the electrical signal rate of change curve first drops to 20% of the highest point of the initial plateau peak area, because it accurately captures the key moment when the electronic current limiting unit completes its main current limiting action and makes the circuit state change significantly. This point can stably reflect the actual response speed of the electronic current limiting unit, and reduce the influence of noise interference compared to the peak point or lower percentage point.

[0064] In this embodiment, by performing first-order differential processing on the acquired electrical signal waveform data, the rate of change curve of the electrical signal is obtained, which can effectively convert the rapid change caused by the response of the electronic current limiting unit in the original electrical signal into obvious features on the rate of change curve, such as sharp peaks or platforms. Since the response of the electronic current limiting unit is accompanied by rapid changes in current or voltage, first-order differential processing can amplify this transient feature, making it form an easily identifiable peak region on the rate of change curve. By selecting the time point when the rate of change curve of the electrical signal first drops from the initial platform peak region to 20% of the peak value as a test time parameter representing the response of the electronic current limiting unit, the key moment when the electronic current limiting unit completes its main current limiting action can be accurately captured. The platform peak region reflects the stage when the electronic current limiting unit starts to intervene and stabilize, and the time point when it drops to 20% of the peak value represents the effective completion of the current limiting action. This selection method can effectively avoid the influence of transient spikes or noise on the identification result, thereby obtaining a representative response time parameter. Further, it provides accurate input for the comparison of the test time parameter and the initial time parameter in the subsequent verification method of the fireproof current limiting protector, thereby making the calculation of the delay time difference and the determination of the verification result reliable, and improving the evaluation ability of the verification method on the real performance state of the protector.

[0065] Based on the verification method of the fireproof current limiting protector described in any of the above embodiments, please refer to Figure 2 The present application also proposes a verification system for a fireproof current limiting protector, which comprises an acquisition module 210, an identification module 220, a comparison module 230 and a determination module 240.

[0066] The acquisition module 210 is used to acquire the initial time parameter of the fireproof current limiting protector to be tested and the electrical signal waveform data in the current test process.

[0067] The identification module 220 is used to identify a test time parameter representing the response of the electronic current limiting unit based on the electrical signal waveform data.

[0068] The comparison module 230 is used to compare the test time parameter with the initial time parameter to obtain a delay time difference.

[0069] The determination module 240 is used to determine the verification result of the fireproof current limiting protector to be tested based on the delay time difference and a preset difference threshold.

[0070] In the embodiment, the fireproof current limiting protector verification method is embodied as a module working in cooperation at the system level, realizing the automation and integration of the verification process. Specifically, the acquisition module 210 is responsible for collecting the initial time parameter of the fireproof current limiting protector to be tested and the electrical signal waveform data in the current test process, thereby providing the original input for the entire verification process. After receiving the electrical signal waveform data, the identification module 220 will analyze it in depth, accurately identifying the test time parameter representing the response of the electronic current limiting unit, and then directly associating it to the evaluation of the core current limiting performance of the protector. The comparison module 230 compares the identified test time parameter with the pre-acquired initial time parameter, calculates the delay time difference between the two, and directly reflects the change in the response speed of the electronic current limiting unit. The determination module 240 automatically judges and gives the verification result of the fireproof current limiting protector to be tested according to the delay time difference and in combination with the preset difference threshold. The acquisition module 210 ensures the accuracy and timeliness of data input; the identification module 220 ensures the accuracy of the extraction of key performance parameters; the comparison module 230 provides the basis for quantifying performance degradation; and the determination module 240 realizes the intelligent determination of the verification result. Through systematic design, not only does it solve the problem of being difficult to effectively implement verification by relying solely on method steps, but also through the close cooperation of various modules, the verification process of the fireproof current limiting protector is more efficient and reliable, and the core fireproof performance of the protector can be continuously and stably monitored and evaluated, thereby effectively avoiding the false pass phenomenon that may be caused by human operation errors or low efficiency, and improving the accuracy and operability of the verification.

[0071] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered in the scope of the present application.

Claims

1. A method for calibrating a fire-proof current-limiting protector, characterized in that: include: Obtaining the initial time parameters of the fire-proof current-limiting protector to be tested and the electrical signal waveform data during the current test process; identifying a test time parameter characterizing a response of an electronic current limiting unit based on the electrical signal waveform data; Comparing the test time parameter with the initial time parameter to obtain a delay time difference; Based on the delay time difference and a preset difference threshold, a verification result of the fire-proof current-limiting protector to be tested is determined.

2. A method for calibrating a fire-proof current-limiting protector according to claim 1, characterized in that: The step of obtaining the initial time parameters of the fire-proof current-limiting protector to be tested comprises: Collect the initial waveform data of the fire-proof current-limiting protector under the standard fault simulation test; Performing filtering processing on the electrical signal in the initial waveform data to obtain a high-frequency electrical signal component associated with the activation of the electronic current limiting unit; An initial time parameter is determined based on the high-frequency electrical signal component and a preset component threshold.

3. A fire-proof current-limiting protector calibration method according to claim 2, characterized in that: In the step of determining the initial time parameter based on the high-frequency electrical signal component and the preset component threshold, the step of constructing the preset component threshold includes: Obtaining background high-frequency current components within a preset time period; Dividing the background high-frequency current component within the preset time period into a plurality of segments, and determining the background energy value within each time segment; Based on the background energy value in each of the time segments, determining a statistic that characterizes the degree of dispersion of the background energy value and satisfies a preset stability condition; The background energy values ​​of all time segments corresponding to the statistic representing the degree of dispersion of the background energy values ​​that meets the preset stability condition are used as preset component thresholds.

4. A method for calibrating a fire-proof current-limiting protector according to claim 1, characterized in that: After the step of determining the verification result of the fire-proof current-limiting protector to be tested based on the delay time difference and the preset difference threshold, the method further includes: Obtaining a historical time parameter between a test time parameter and an initial time parameter, a first time interval parameter for testing between the initial time parameter and the historical time parameter, and a second time interval parameter for testing between the test time parameter and the historical time parameter of the fire-proof current-limiting protector to be tested; determining a first response time change rate and a second response time change rate based on the initial time parameter, the historical time parameter, the first time interval parameter, the test time parameter, and the second time interval parameter; The first response time change rate is compared with the second response time change rate to determine a degradation result of the fire current limiting protector.

5. A method for calibrating a fire-proof current-limiting protector according to claim 4, characterized in that: The step of determining the first response time change rate and the second response time change rate based on the initial time parameter, the historical time parameter, the first time interval parameter, the test time parameter, and the second time interval parameter includes: The initial time parameter, the historical time parameter and the first time interval parameter are used to determine a first response time change rate; A second response time change rate is determined based on the historical time parameter, the test time parameter, and the second time interval parameter.

6. A method for calibrating a fire-proof current-limiting protector according to claim 4, characterized in that: The step of comparing the first response time change rate with the second response time change rate to determine the degradation result of the fire current limiting protector further includes: Obtain the preset risk level of the circuit where the fire-proof current-limiting protector to be tested is located; Based on the preset risk level, selecting a determination criterion corresponding to the preset risk level from a plurality of preset determination criteria; After comparing the first response time change rate with the second response time change rate, a judgment is made using the judgment standard comparison result to determine the decay result of the fire current limiting protector.

7. A method for calibrating a fire-proof current-limiting protector according to claim 6, characterized in that: After comparing the first response time change rate with the second response time change rate, the step of determining the decay result of the fire current limiting protector by using the judgment standard comparison result is as follows: comparing the first response time change rate with the second response time change rate to determine a decay trend score; Determining a recession trend score threshold corresponding to the risk level using the determination criteria; The decay trend score is compared with a decay trend score threshold to determine a decay result of the fire current limiting protector.

8. A method for calibrating a fire-proof current-limiting protector according to claim 2, characterized in that: The steps for collecting initial waveform data of the fire-proof current-limiting protector to be tested under the standard fault simulation test include: Perform clock synchronization on multiple electrical signal probes that collect signals from the fire-proof current-limiting protector under standard fault simulation test; Use multiple electrical signal probes to synchronously collect data from the fire-proof current-limiting protector to confirm the original waveform data; The original waveform data is filtered to obtain initial waveform data.

9. A method for calibrating a fire-proof current-limiting protector according to claim 1, characterized in that: The step of identifying a test time parameter characterizing a response of the electronic current limiting unit based on the electrical signal waveform data includes: Performing first-order difference processing on the electrical signal waveform data to obtain an electrical signal change rate curve; The time point when the electrical signal change rate curve first drops from the initial platform peak area to 20% of the peak value is selected as the test time parameter to characterize the response of the electronic current limiting unit.

10. A fire-proof current-limiting protector calibration system, used to execute the fire-proof current-limiting protector calibration method according to claim 1, characterized in that: The system includes: An acquisition module is used to obtain the initial time parameters of the fire-proof current-limiting protector to be tested and the electrical signal waveform data during the current test process; an identification module, configured to identify a test time parameter characterizing a response of an electronic current limiting unit based on the electrical signal waveform data; A comparison module, configured to compare the test time parameter with the initial time parameter to obtain a delay time difference; The determination module is used to determine the verification result of the fire-proof current-limiting protector to be tested based on the delay time difference and a preset difference threshold.

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