Protection switch aging monitoring and early warning method and device based on multi-parameter fusion

Abstract

The application discloses a protection switch aging monitoring and early warning method and device based on multi-parameter fusion, wherein a plurality of first closing vibration signals of the protection switch during multiple closing operations are acquired; a first aging parameter of the protection switch is determined based on the plurality of first closing vibration signals; an insulation performance parameter of an insulation layer of the protection switch is acquired; a second aging parameter of the protection switch is determined based on the insulation performance parameter; a target aging parameter of the protection switch is determined based on the first aging parameter and the second aging parameter; and aging early warning is performed based on the target aging parameter. The application can improve the efficiency of protection switch aging state detection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of smart meters, in particular to a protection switch aging monitoring and early warning method and device based on multi-parameter fusion. BACKGROUND

[0002] A smart meter is a smart terminal of a smart grid. In addition to the basic metering function of traditional electric energy meters, in order to adapt to the use of smart grids and new energy, the smart meter has intelligent functions such as bidirectional multi-rate metering function, user terminal control function, bidirectional data communication function of multiple data transmission modes, and anti-theft function. The smart meter represents the development direction of the intelligent terminal of the final user of the future energy-saving smart grid. However, the protection switch of the smart meter is prone to safety hazards after aging. The detection of the aging of the protection switch in the prior art mainly relies on manual detection, and the detection efficiency is low.

[0003] That is, the efficiency of protection switch aging state detection in the prior art is low. SUMMARY

[0004] The embodiments of the present application provide a protection switch aging monitoring and early warning method and device based on multi-parameter fusion, which can improve the efficiency of protection switch aging state detection.

[0005] In a first aspect, the present application provides a protection switch aging monitoring and early warning method based on multi-parameter fusion, comprising:

[0006] Obtaining a plurality of first closing vibration signals of the protection switch during multiple closing operations;

[0007] Determining a first aging parameter of the protection switch based on the plurality of first closing vibration signals;

[0008] Obtaining an insulation performance parameter of an insulation layer of the protection switch;

[0009] Determining a second aging parameter of the protection switch based on the insulation performance parameter;

[0010] Determining a target aging parameter of the protection switch based on the first aging parameter and the second aging parameter;

[0011] Performing aging early warning based on the target aging parameter.

[0012] In an optional embodiment, the first closing vibration signal includes a vibration frequency and a vibration duration, and the determination of the first aging parameter of the protection switch based on the plurality of first closing vibration signals comprises:

[0013] obtaining a first frequency average of vibration frequencies in a first closing vibration signal of multiple closing operations of the protection switch and a time length average of vibration time lengths in the first closing vibration signal of the multiple closing operations of the protection switch;

[0014] determining a first aging parameter based on the first frequency average and the time length average, wherein the first aging parameter is larger when the first frequency average is smaller or the time length average is higher.

[0015] In an optional embodiment, the obtaining of the multiple first closing vibration signals of the multiple closing operations of the protection switch comprises:

[0016] acquiring a vibration signal sequence of the protection switch by a vibration sensor on the protection switch, the vibration signal sequence comprising amplitudes at multiple time points;

[0017] obtaining multiple de-energization time points of the protection switch;

[0018] determining, as a second closing vibration signal corresponding to the de-energization time point, an attenuation oscillation curve of the vibration signal sequence closest to the de-energization time point, to obtain multiple second closing vibration signals corresponding to the multiple de-energization time points, wherein the attenuation oscillation curve is a sine function curve with gradually decreasing amplitude to zero;

[0019] screening the multiple first closing vibration signals from the multiple second closing vibration signals.

[0020] In an optional embodiment, the screening of the multiple first closing vibration signals from the multiple second closing vibration signals comprises:

[0021] determining whether an automatic protection event occurs in a preset time period before the de-energization time point, wherein the automatic protection event comprises a leakage time, an overload event and a short-circuit time;

[0022] if the automatic protection event occurs in the preset time period before the de-energization time point, determining the second closing vibration signal corresponding to the de-energization time point as a third closing vibration signal to obtain multiple third closing vibration signals;

[0023] screening the multiple first closing vibration signals from the multiple third closing vibration signals.

[0024] In an optional embodiment, the insulation performance parameter comprises leakage currents at multiple time points and dielectric strengths at multiple time points, and the determination of the second aging parameter of the protection switch based on the insulation performance parameter comprises:

[0025] calculating a current average of the leakage currents at the multiple time points and a strength average of the dielectric strengths at the multiple time points;

[0026] determine a second aging parameter based on the current average value and the intensity average value.

[0027] In an optional embodiment, the determining the target aging parameter of the protection switch based on the first aging parameter and the second aging parameter comprises:

[0028] obtaining a temperature change curve of a contact of the protection switch through a temperature sensor;

[0029] performing linear fitting on the temperature change curve to obtain a temperature fitting straight line;

[0030] obtaining a current change curve of the working current through the protection switch through a current sensor;

[0031] determining a third aging parameter based on a slope of the temperature fitting straight line and a coefficient of variation of the current change curve, wherein the greater the slope of the temperature fitting straight line, the greater the third aging parameter, and the greater the coefficient of variation of the current change curve, the greater the third aging parameter;

[0032] determining the target aging parameter of the protection switch based on the first aging parameter, the second aging parameter and the third aging parameter.

[0033] In a second aspect, the application provides a protection switch aging monitoring and early warning device based on multi-parameter fusion, comprising:

[0034] a first acquisition module configured to acquire a plurality of first closing vibration signals of the protection switch during multiple closing operations;

[0035] a first determination module configured to determine a first aging parameter of the protection switch based on the plurality of first closing vibration signals;

[0036] a second acquisition module configured to acquire an insulation performance parameter of an insulation layer of the protection switch;

[0037] a second determination module configured to determine a second aging parameter of the protection switch based on the insulation performance parameter;

[0038] a third determination module configured to determine a target aging parameter of the protection switch based on the first aging parameter and the second aging parameter;

[0039] an early warning module configured to perform aging early warning based on the target aging parameter.

[0040] In an optional embodiment, the first closing vibration signal comprises a vibration frequency and a vibration duration, and the determining the first aging parameter of the protection switch based on the plurality of first closing vibration signals comprises:

[0041] obtaining a first frequency average of vibration frequencies in a first closing vibration signal of multiple closing operations of the protection switch and a time length average of vibration time lengths in the first closing vibration signal of the multiple closing operations of the protection switch;

[0042] determining a first aging parameter based on the first frequency average and the time length average, wherein the first aging parameter is larger when the first frequency average is smaller or the time length average is higher.

[0043] In an optional embodiment, the obtaining of the multiple first closing vibration signals of the multiple closing operations of the protection switch comprises:

[0044] acquiring a vibration signal sequence of the protection switch by a vibration sensor on the protection switch, the vibration signal sequence comprising amplitudes at multiple time points;

[0045] obtaining multiple de-energization time points of the protection switch;

[0046] determining a decay oscillation curve closest to the de-energization time point in the vibration signal sequence as a second closing vibration signal corresponding to the de-energization time point, to obtain multiple second closing vibration signals corresponding to the multiple de-energization time points, wherein the decay oscillation curve is a sine function curve with gradually decreasing amplitude to zero;

[0047] screening the multiple first closing vibration signals from the multiple second closing vibration signals.

[0048] In an optional embodiment, the screening of the multiple first closing vibration signals from the multiple second closing vibration signals comprises:

[0049] determining whether an automatic protection event occurs in a preset time period before the de-energization time point, wherein the automatic protection event comprises a leakage time, an overload event and a short-circuit time;

[0050] if the automatic protection event occurs in the preset time period before the de-energization time point, determining the second closing vibration signal corresponding to the de-energization time point as a third closing vibration signal to obtain multiple third closing vibration signals;

[0051] screening the multiple first closing vibration signals from the multiple third closing vibration signals.

[0052] In an optional embodiment, the insulation performance parameter comprises leakage currents at multiple time points and dielectric strengths at multiple time points, and the determining of the second aging parameter of the protection switch based on the insulation performance parameter comprises:

[0053] calculating a current average of the leakage currents at the multiple time points and a strength average of the dielectric strengths at the multiple time points;

[0054] determining a second aging parameter based on the current average value and the intensity average value.

[0055] In an optional embodiment, the determining the target aging parameter of the protection switch based on the first aging parameter and the second aging parameter comprises:

[0056] obtaining a temperature of a contact of the protection switch through a temperature sensor to obtain a temperature change curve;

[0057] performing linear fitting on the temperature change curve to obtain a temperature fitting straight line;

[0058] detecting an operating current passing through the protection switch through a current sensor to obtain a current change curve;

[0059] determining a third aging parameter based on a slope of the temperature fitting straight line and a coefficient of variation of the current change curve, wherein the greater the slope of the temperature fitting straight line, the greater the third aging parameter, and the greater the coefficient of variation of the current change curve, the greater the third aging parameter;

[0060] determining the target aging parameter of the protection switch based on the first aging parameter, the second aging parameter, and the third aging parameter.

[0061] In a third aspect, an electronic device is provided, which includes a memory and a processor. The memory stores a computer program, and the processor is configured to execute the computer program stored in the memory to implement the steps of the protection switch aging monitoring and early warning method based on multi-parameter fusion provided in the present application.

[0062] In a fourth aspect, a computer readable storage medium is provided, which stores a plurality of instructions. The instructions are adapted to be loaded by a processor to implement the steps of the protection switch aging monitoring and early warning method based on multi-parameter fusion provided in the present application.

[0063] In a fifth aspect, a computer program product is provided, which includes a computer program or instructions. When the computer program or instructions are executed by a processor, the steps of the protection switch aging monitoring and early warning method based on multi-parameter fusion provided in the present application are implemented.

[0064] In the present application, compared with the related art, a plurality of first closing vibration signals of the protection switch during multiple closing operations are obtained; a first aging parameter of the protection switch is determined based on the plurality of first closing vibration signals; an insulation performance parameter of an insulation layer of the protection switch is obtained; a second aging parameter of the protection switch is determined based on the insulation performance parameter; a target aging parameter of the protection switch is determined based on the first aging parameter and the second aging parameter; and aging early warning is performed based on the target aging parameter. The present application can improve the efficiency of protection switch aging state detection. BRIEF DESCRIPTION OF DRAWINGS

[0065] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0066] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0067] Figure 1 is a scene schematic diagram of a protection switch aging monitoring and early warning system based on multi-parameter fusion provided by the embodiments of the present application;

[0068] Figure 2 is an embodiment flow schematic diagram of a protection switch aging monitoring and early warning method based on multi-parameter fusion provided by the embodiments of the present application;

[0069] Figure 3 is a structure schematic diagram of an embodiment of a protection switch aging monitoring and early warning device based on multi-parameter fusion provided by the embodiments of the present application;

[0070] Figure 4 is a structure schematic diagram of an electronic device provided by the embodiments of the present application. DETAILED DESCRIPTION

[0071] It should be noted that the principles of the present application are exemplified in an appropriate operating environment. The following description is based on the exemplified embodiments of the present application, which should not be regarded as limiting other embodiments of the present application not described in detail.

[0072] In the following description of the present application, "some embodiments" are described, which describe a subset of all possible embodiments, but it can be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0073] In the following description of the present application, the terms "first\second\third" are only to distinguish similar objects, and do not represent a specific order of the objects. It can be understood that "first\second\third" can be interchanged with a specific order or sequence as allowed, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0074] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0075] In order to improve the effect of protection switch aging monitoring and early warning based on multi-parameter fusion, the application provides a protection switch aging monitoring and early warning method based on multi-parameter fusion, a protection switch aging monitoring and early warning device based on multi-parameter fusion, an electronic device, a computer readable storage medium and a computer program product. The protection switch aging monitoring and early warning method based on multi-parameter fusion can be executed by the protection switch aging monitoring and early warning device based on multi-parameter fusion, or by an electronic device integrated with the protection switch aging monitoring and early warning device based on multi-parameter fusion.

[0076] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the application.

[0077] Please refer to Figure 1 The application also provides a protection switch aging monitoring and early warning system based on multi-parameter fusion. As shown in Figure 1 The protection switch aging monitoring and early warning system based on multi-parameter fusion includes an electronic device. The electronic device is integrated with the protection switch aging monitoring and early warning device based on multi-parameter fusion provided by the application.

[0078] The electronic device can be any device with a processor, such as a smart phone, a tablet computer, a palm computer, a notebook computer, a smart speaker, etc. The electronic device can also be a desktop computer, a television, a server, an industrial device, etc.

[0079] In addition, as shown in Figure 1 The protection switch aging monitoring and early warning system based on multi-parameter fusion can also include a memory for storing raw data, intermediate data and result data in the audio processing process,

[0080] In the embodiments of the present application, the memory can be a cloud memory. Cloud storage is a new concept extended and developed on the basis of the concept of cloud computing. A distributed cloud storage system (hereinafter referred to as a storage system) refers to a storage system in which a large number of storage devices (storage devices are also referred to as storage nodes) of various types are collected and work cooperatively to provide data storage and business access functions to the outside through the functions of cluster application, grid technology, and distributed storage file system.

[0081] At present, the storage method of the storage system is as follows: a logical volume is created, and a physical storage space is allocated to each logical volume when the logical volume is created. The physical storage space can be a disk of a certain storage device or a disk group of several storage devices. The client stores data on a certain logical volume, that is, stores the data on the file system. The file system divides the data into many parts, each part being an object. The object contains not only data but also additional information such as an ID entity (ID). The file system writes each object to the physical storage space of the logical volume, and records the storage location information of each object, so that when the client requests to access the data, the file system can enable the client to access the data according to the storage location information of each object.

[0082] The process of allocating the physical storage space to the logical volume by the storage system is as follows: the physical storage space is divided into sections in advance according to the capacity estimation of the object stored in the logical volume (the estimation often has a large margin relative to the actual capacity of the object to be stored) and the group of RAID (Redundant Array of Independent Disk). A logical volume can be understood as a section, so that the logical volume is allocated with the physical storage space.

[0083] It should be noted that, Figure 1 The scene diagram of the protection switch aging monitoring and early warning system based on multi-parameter fusion shown is merely an example. The protection switch aging monitoring and early warning system based on multi-parameter fusion and the scene described in the embodiments of the present application are used to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. It is known to those skilled in the art that, as the protection switch aging monitoring and early warning system based on multi-parameter fusion evolves and new business scenarios appear, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0084] The following will be described in detail. It should be noted that the serial numbers of the following embodiments do not limit the preferred order of the embodiments.

[0085] Please refer toFigure 2 , Figure 2 is an embodiment process schematic diagram of the protection switch aging monitoring and early warning method based on multi-parameter fusion provided by the embodiment of the present application, as Figure 2 shown, the process of the protection switch aging monitoring and early warning method based on multi-parameter fusion provided by the present application is as follows:

[0086] 201, a plurality of first closing vibration signals of the protection switch at multiple times of closing are acquired.

[0087] In the embodiment of the present application, the plurality of first closing vibration signals of the protection switch at multiple times of closing are acquired, comprising:

[0088] (1) The vibration signal sequence of the protection switch is collected through the vibration sensor on the protection switch, and the vibration signal sequence includes the amplitudes at multiple times.

[0089] (2) A plurality of power-off times of the protection switch are acquired.

[0090] Among them, the power-off time is the time when the circuit protected by the protection switch is powered off.

[0091] (3) The attenuation oscillation curve closest to the power-off time in the vibration signal sequence is determined as the second closing vibration signal corresponding to the power-off time, and a plurality of second closing vibration signals corresponding to a plurality of power-off times are obtained.

[0092] Among them, the attenuation oscillation curve is a sine function curve whose amplitude gradually decreases to zero.

[0093] In the embodiment of the present application, the amplitude maximum time when the amplitude of the attenuation oscillation curve is maximum is acquired, and the attenuation oscillation curve corresponding to the amplitude maximum time closest to the power-off time is determined as the attenuation oscillation curve closest to the power-off time.

[0094] (4) A plurality of first closing vibration signals are selected from the plurality of second closing vibration signals.

[0095] In one specific embodiment, a plurality of first closing vibration signals are selected from the plurality of second closing vibration signals at random.

[0096] Since closing can be manual operation or automatic closing, manual pressing of the protection switch will affect vibration. In order to avoid this influence, in another specific embodiment, the plurality of first closing vibration signals are selected from the plurality of second closing vibration signals, comprising:

[0097] Step 1-1, it is judged whether an automatic protection event occurs in the protection circuit within a preset time period before the power-off time, wherein the automatic protection event includes leakage time, overload event and short circuit time.

[0098] Step 1-2, if an automatic protection event occurs in the protection circuit within a preset period before the power-off time, the second closing vibration signal corresponding to the power-off time is determined as the third closing vibration signal, and a plurality of third closing vibration signals are obtained.

[0099] Step 1-3, screening a plurality of first closing vibration signals from the plurality of third closing vibration signals.

[0100] In one specific embodiment, a plurality of first closing vibration signals are screened from the plurality of third closing vibration signals.

[0101] In another specific embodiment, the plurality of third closing vibration signals are clustered to obtain a plurality of signal clustering clusters; and the plurality of third closing vibration signals in the signal clustering cluster with the most vibration signals in the plurality of signal clustering clusters are determined as the plurality of first closing vibration signals.

[0102] 202, determining a first aging parameter of the protection switch based on the plurality of first closing vibration signals.

[0103] In the embodiments of the present application, the first closing vibration signal includes a vibration frequency and a vibration duration, and determining the first aging parameter of the protection switch based on the plurality of first closing vibration signals includes:

[0104] (1) obtaining a first frequency average of the vibration frequency in the first closing vibration signal at multiple closing times and a duration average of the vibration duration in the first closing vibration signal at multiple closing times.

[0105] (2) determining the first aging parameter based on the first frequency average and the duration average, wherein the smaller the first frequency average, the larger the first aging parameter, and the higher the duration average, the larger the first aging parameter.

[0106] In one specific embodiment, first, a series of sample values about frequency and duration in the relevant data are collected. For frequency data, the average value is calculated to obtain the first frequency average, and for duration data, the average value is also calculated to obtain the duration average. For example, the first aging parameter = k1 / first frequency average + k2*duration average, wherein k1 and k2 are weight coefficients preset according to actual conditions and data characteristics, used to adjust the relative degree of the influence of frequency and duration on the first aging parameter.

[0107] Suppose the running data in a period of time is collected, the frequency values are 2Hz, 3Hz and 4Hz respectively, and the time length values are 5 hours, 6 hours and 7 hours respectively. First, the first frequency average value is calculated, i.e. (2+3+4) / 3=3Hz, and the time length average value is (5+6+7) / 3=6 hours. If k1=10 and k2=2 are preset, according to the above formula, the first aging parameter=10 / 3+2*6≈3.33+12=15.33. When the frequency average value becomes 2Hz and other conditions remain unchanged, the first aging parameter=10 / 2+2*6=5+12=17, which shows that the first aging parameter increases as the first frequency average value decreases. If the time length average value becomes 8 hours and the frequency average value remains 3Hz, the first aging parameter=10 / 3+2*8≈3.33+16=19.33, which shows that the first aging parameter also increases as the time length average value increases.

[0108] 203、Obtain the insulation performance parameter of the insulation layer of the protection switch.

[0109] In the embodiment of the present application, the insulation performance parameter includes leakage currents at multiple time points and dielectric strengths at multiple time points. The non-conductivity of an insulator is only relative. With the change of the peripheral environmental conditions, in fact, no insulating material is absolutely non-conductive. Any insulating material, when a voltage is applied to its two ends, will always have a certain current passing through, and the active component of this current is called leakage current, and this phenomenon is called leakage of the insulator. The leakage current is actually the current flowing through the insulation part of the electrical circuit or device under the action of no fault and applied voltage. The leakage current refers to the extremely small current generated between the fire line and the zero line of the electrical appliance during normal operation, which is equivalent to the static electricity of the general electrical appliance. The leakage current tester is mainly used to test the L pole and the N pole. The dielectric strength is a measure of the electrical strength of a material as an insulator. It is defined as the maximum voltage per unit thickness that the sample can withstand before breakdown, expressed in volts per unit thickness. The greater the dielectric strength of a substance, the better its quality as an insulator.

[0110] 204、Determine the second aging parameter of the protection switch based on the insulation performance parameter.

[0111] In the embodiment of the present application, the insulation performance parameter includes leakage currents at multiple time points and dielectric strengths at multiple time points, and the current average value of the leakage currents at multiple time points and the strength average value of the dielectric strengths at multiple time points are calculated; the second aging parameter is determined based on the current average value and the strength average value. The greater the current average value, the smaller the second aging parameter, and the greater the strength average value, the greater the second aging parameter.

[0112] In one specific embodiment, a plurality of data samples related to current and intensity are collected first. For current data, the average value thereof is calculated as the current average value; for intensity data, the average value is calculated as the intensity average value. The second aging parameter = k3* intensity average value - k4 / current average value, where k3 and k4 are weight coefficients preset according to actual scenarios and data characteristics, which determine the weight size of the influence of intensity and current on the second aging parameter.

[0113] Suppose there is a set of data when the device is working, the leakage current is 3A, 4A, 5A, and the dielectric strength is 8, 9, 10 respectively. First, calculate the current average value as (3+4+5) / 3 = 4A, and the intensity average value as (8+9+10) / 3 = 9. If k3 = 3 and k4 = 6 are preset in advance, according to the above formula, the second aging parameter = 3*9-6 / 4 = 27-1.5 = 25.5. When the current average value becomes 5A, other conditions remain unchanged, the second aging parameter = 3*9-6 / 5 = 27-1.2 = 25.8, it can be seen that the current average value increases, and the second aging parameter becomes smaller; if the intensity average value becomes 11, and the current average value is still 4A, the second aging parameter = 3*11-6 / 4 = 33-1.5 = 31.5, indicating that the intensity average value increases, and the second aging parameter increases.

[0114] 205、Based on the first aging parameter and the second aging parameter, determine the target aging parameter of the protection switch.

[0115] Wherein, the greater the first aging parameter, the greater the target aging parameter of the protection switch, the greater the second aging parameter, the greater the target aging parameter of the protection switch.

[0116] In one specific embodiment, the first aging parameter and the second aging parameter are weighted and summed to obtain the target aging parameter of the protection switch.

[0117] In another specific embodiment, determining the target aging parameter of the protection switch based on the first aging parameter and the second aging parameter comprises:

[0118] (1) Obtain the temperature of the contact of the protection switch through the temperature sensor to obtain the temperature change curve.

[0119] (2) Linear fitting is performed on the temperature change curve to obtain the temperature fitting straight line.

[0120] (3) Detect the working current of the protection switch through the current sensor to obtain the current change curve.

[0121] Wherein, the working current of the protection switch is the current of the protection switch working normally. The sampling frequency is optimized according to the change speed of the key components, such as the sampling frequency of the temperature sensor is 1Hz, and the sampling frequency of the vibration sensor is 10Hz.

[0122] (4) determining a third aging parameter based on a slope of a temperature fitting straight line and a coefficient of variation of a current variation curve, wherein the greater the slope of the temperature fitting straight line, the greater the third aging parameter, and the greater the coefficient of variation of the current variation curve, the greater the third aging parameter.

[0123] In a specific embodiment, first, a linear regression method is used to fit a straight line of temperature change over time for temperature data, and then the slope of the straight line is calculated. For current data, the coefficient of variation of the current variation curve is calculated, which can be obtained by first calculating the standard deviation of the current data and then dividing by the average current value. The third aging parameter = k5*the slope of the temperature fitting straight line + k6*the coefficient of variation of the current variation curve, wherein k5 and k6 are weight coefficients preset according to the actual application scenario and data characteristics, used to regulate the degree of influence of the temperature slope and the coefficient of variation of the current on the third aging parameter.

[0124] Suppose a device is monitored, and the recorded temperature data is (1 hour, 25°C), (2 hours, 28°C), (3 hours, 31°C) in a period of time. The slope of the temperature fitting straight line is 3°C / hour by linear regression fitting. At the same time, the recorded current data is 3A, 4A, 5A, 4A, 3A, the average current is (3+4+5+4+3) / 5 = 3.8A, and the standard deviation is about 0.75A, so the coefficient of variation of the current variation curve is 0.75 ÷ 3.8 ≈ 0.197. If k5 = 2 and k6 = 10 are preset, the third aging parameter = 2*3 + 10*0.197 = 6 + 1.97 = 7.97 according to the formula. When the slope of the temperature fitting straight line becomes 4°C / hour, and other conditions remain unchanged, the third aging parameter = 2*4 + 10*0.197 = 8 + 1.97 = 9.97, which shows that the greater the slope of the temperature fitting straight line, the greater the third aging parameter. If the coefficient of variation of the current variation curve becomes 0.25, and the temperature slope remains 3°C / hour, the third aging parameter = 2*3 + 10*0.25 = 6 + 2.5 = 8.5, which shows that the greater the coefficient of variation of the current variation curve, the greater the third aging parameter.

[0125] (5) determining a target aging parameter of the protection switch based on the first aging parameter, the second aging parameter, and the third aging parameter.

[0126] In a specific embodiment, the first aging parameter, the second aging parameter, and the third aging parameter are weighted and summed to obtain the target aging parameter of the protection switch.

[0127] Specifically, the target aging parameter = w1*the first aging parameter + w2*the second aging parameter + w3*the third aging parameter, wherein w1, w2, w3 are weight coefficients of the first aging parameter, the second aging parameter and the third aging parameter respectively. These weight coefficients need to be reasonably set according to actual conditions, such as the importance of each parameter to the aging of the protective switch and other factors, and w1 + w2 + w3 = 1, to ensure that the contribution of each parameter to the target aging parameter is within a reasonable range. Assuming that the first aging parameter is 15.33, the second aging parameter is 25.5, and the third aging parameter is 7.97. According to actual experience and related analysis, we determine w1 = 0.3, w2 = 0.5, and w3 = 0.2. Then, according to the above formula, the target aging parameter of the protective switch = 0.3*15.33 + 0.5*25.5 + 0.2*7.97 = 4.6 + 12.75 + 1.594 = 18.944.

[0128] In another specific embodiment, determining the target aging parameter of the protective switch based on the first aging parameter, the second aging parameter and the third aging parameter comprises:

[0129] (1) Obtaining the closing time of the protective switch closest to the de-energization time before the de-energization time.

[0130] (2) Determining the time difference between the closing time and the de-energization time as the first shutdown delay time corresponding to the de-energization time.

[0131] (3) Determining the target shutdown delay time based on the first shutdown delay time.

[0132] In one specific embodiment, the first shutdown delay time is determined as the target shutdown delay time.

[0133] In another specific embodiment, a second shutdown delay time obtained by measuring the protective switch is obtained. The target shutdown delay time is determined based on the first shutdown delay time and the second shutdown delay time. Specifically, the average of the first shutdown delay time and the second shutdown delay time is determined as the target shutdown delay time.

[0134] In one specific embodiment, the protection switch comprises an insulated gate bipolar transistor. The protection switch comprises a gate, a collector, an emitter and a chip. The protection switch is turned off by applying a reverse voltage. After a reverse voltage pulse triggers, a gate drive current is established, a gate-emitter voltage starts to drop until a Miller plateau voltage. After the gate-emitter voltage drops to the Miller plateau voltage, a depletion layer starts to form under the gate. At this time, the carrier concentration under the gate region is still high and uniform. After the depletion layer under the gate region is completely formed, it starts to expand towards the collector, and the collector-emitter voltage rises rapidly. A direct current voltage is input to the protection switch, and various measurement parameters of the protection switch are measured. Based on the various measurement parameters and various period parameters, a second turn-off delay time T g .

[0135] The calculation formula of the second turn-off delay time T g is as follows:

[0136]

[0137] Wherein, R g is a chip built-in drive resistance, C gc is a parasitic capacitance between the gate and the collector, C ge is a parasitic capacitance between the gate and the emitter, u gon is a gate drive voltage, u goff is a gate turn-off voltage, u gp is a Miller plateau voltage, W c is a depletion layer width, J e is a gate electron current density change, T is a junction temperature, q is a unit charge, n e is a carrier concentration, S a is a carrier concentration, U dc is a direct current voltage, v sat is a saturation drift velocity of the carrier, J e is a decrease of the electron current in the MOS channel under the gate region, g m is a protection switch transconductance value, u ge is a gate-emitter voltage change.

[0138] (4) determining a fourth aging parameter based on the target turn-off delay time, wherein the greater the target turn-off delay time, the greater the fourth aging parameter.

[0139] Specifically, the target turn-off delay time is determined as the fourth aging parameter.

[0140] (5) determining a target aging parameter of the protection switch based on the first aging parameter, the second aging parameter, the third aging parameter and the fourth aging parameter.

[0141] Specifically, the target aging parameter = w1*first aging parameter + w2*second aging parameter + w3*third aging parameter + w4*third aging parameter, wherein w1, w2, w3, w4 are weight coefficients of the first aging parameter, the second aging parameter, the third aging parameter and the fourth aging parameter, respectively. These weight coefficients need to be reasonably set according to actual conditions, such as the importance of each parameter to the aging of the protective switch and other factors, and w1+w2+w3+w4=1 to ensure that the contribution of each parameter to the target aging parameter is within a reasonable range. For example, w1=0.1, w2=0.3, w3=0.4, w4=0.2.

[0142] Wherein, the greater the first aging parameter, the greater the target aging parameter of the protective switch, the greater the second aging parameter, the greater the target aging parameter of the protective switch, the greater the third aging parameter, the greater the target aging parameter of the protective switch, and the greater the fourth aging parameter, the greater the target aging parameter of the protective switch.

[0143] In one specific embodiment, the first aging parameter, the second aging parameter, the third aging parameter and the fourth aging parameter are summed to obtain the target aging parameter of the protective switch.

[0144] 206, aging warning based on the target aging parameter.

[0145] In one specific embodiment, four aging levels are divided, and different aging levels correspond to different parameter ranges. The four aging levels are "normal aging level", "mild aging level", "moderate aging level" and "severe aging level". If the target aging parameter belongs to the mild aging level, the user is prompted to pay attention to the device state. If the target aging parameter belongs to the moderate aging level, the user is suggested to check and maintain the device. If the target aging parameter belongs to the severe aging level, the user is prompted to replace the switch immediately to avoid safety accidents.

[0146] Compared with the related art, a plurality of first closing vibration signals of the protective switch during multiple closing operations are obtained; the first aging parameter of the protective switch is determined based on the plurality of first closing vibration signals; the insulation performance parameter of the insulation layer of the protective switch is obtained; the second aging parameter of the protective switch is determined based on the insulation performance parameter; the target aging parameter of the protective switch is determined based on the first aging parameter and the second aging parameter; and the aging warning is performed based on the target aging parameter. The present application can improve the efficiency of detecting the aging state of the protective switch.

[0147] In order to better implement the multi-parameter fusion based protection switch aging monitoring and early warning method provided in the embodiments of the present application, the embodiments of the present application further provide a multi-parameter fusion based protection switch aging monitoring and early warning device based on the above multi-parameter fusion based protection switch aging monitoring and early warning method. The meanings of the terms are the same as those in the above multi-parameter fusion based protection switch aging monitoring and early warning method, and specific implementation details are described with reference to the description in the method embodiments.

[0148] Please refer to Figure 3 , Figure 3 is a structural schematic diagram of an embodiment of the multi-parameter fusion based protection switch aging monitoring and early warning device provided in the embodiments of the present application. The multi-parameter fusion based protection switch aging monitoring and early warning device can include a first acquisition module 701, a first determination module 702, a second acquisition module 703, a second determination module 704, a third determination module 705, and a warning module 706, wherein

[0149] The first acquisition module 701 is configured to acquire a plurality of first closing vibration signals of the protection switch during multiple closing operations.

[0150] The first determination module 702 is configured to determine a first aging parameter of the protection switch based on the plurality of first closing vibration signals.

[0151] The second acquisition module 703 is configured to acquire an insulation performance parameter of an insulation layer of the protection switch.

[0152] The second determination module 704 is configured to determine a second aging parameter of the protection switch based on the insulation performance parameter.

[0153] The third determination module 705 is configured to determine a target aging parameter of the protection switch based on the first aging parameter and the second aging parameter.

[0154] The warning module 706 is configured to perform aging warning based on the target aging parameter.

[0155] In an optional embodiment, the first closing vibration signal includes a vibration frequency and a vibration duration, and the determination of the first aging parameter of the protection switch based on the plurality of first closing vibration signals includes:

[0156] acquiring a first frequency average of the vibration frequency in the first closing vibration signal during the multiple closing operations and a duration average of the vibration duration in the first closing vibration signal during the multiple closing operations;

[0157] determining the first aging parameter based on the first frequency average and the duration average, wherein the smaller the first frequency average is, the larger the first aging parameter is, and the higher the duration average is, the larger the first aging parameter is.

[0158] In an optional embodiment, the acquiring a plurality of first closing vibration signals of the protection switch during multiple closing operations of the protection switch comprises:

[0159] acquiring a vibration signal sequence of the protection switch through a vibration sensor on the protection switch, the vibration signal sequence comprising amplitudes at multiple time points;

[0160] acquiring a plurality of de-energization time points of the protection switch;

[0161] determining a decay oscillation curve closest to the de-energization time point in the vibration signal sequence as a second closing vibration signal corresponding to the de-energization time point, to obtain a plurality of second closing vibration signals corresponding to the plurality of de-energization time points, wherein the decay oscillation curve is a sine function curve with gradually decreasing amplitude to zero;

[0162] screening a plurality of first closing vibration signals from the plurality of second closing vibration signals.

[0163] In an optional embodiment, the screening a plurality of first closing vibration signals from the plurality of second closing vibration signals comprises:

[0164] determining whether an automatic protection event occurs in a preset time period before the de-energization time point, wherein the automatic protection event comprises a leakage time, an overload event, and a short-circuit time;

[0165] if the automatic protection event occurs in the preset time period before the de-energization time point, determining the second closing vibration signal corresponding to the de-energization time point as a third closing vibration signal, to obtain a plurality of third closing vibration signals;

[0166] screening a plurality of first closing vibration signals from the plurality of third closing vibration signals.

[0167] In an optional embodiment, the insulation performance parameters comprise leakage currents at multiple time points and dielectric strengths at multiple time points, and the determining a second aging parameter of the protection switch based on the insulation performance parameters comprises:

[0168] calculating a current average of the leakage currents at the multiple time points and a strength average of the dielectric strengths at the multiple time points;

[0169] determining a second aging parameter based on the current average and the strength average.

[0170] In an optional embodiment, the determining a target aging parameter of the protection switch based on the first aging parameter and the second aging parameter comprises:

[0171] Obtain the temperature of the contact of the protection switch through the temperature sensor, and obtain a temperature change curve;

[0172] Linearly fit the temperature change curve, and obtain a temperature fitting straight line;

[0173] Detect the working current passing through the protection switch through the current sensor, and obtain a current change curve;

[0174] Determine a third aging parameter based on the slope of the temperature fitting straight line and the coefficient of variation of the current change curve, wherein the greater the slope of the temperature fitting straight line, the greater the third aging parameter, and the greater the coefficient of variation of the current change curve, the greater the third aging parameter;

[0175] Determine the target aging parameter of the protection switch based on the first aging parameter, the second aging parameter and the third aging parameter.

[0176] The specific implementation of each module can be referred to the foregoing embodiments, which will not be described here.

[0177] Compared with the related art, a plurality of first closing vibration signals of the protection switch during multiple closing operations are obtained; the first aging parameter of the protection switch is determined based on the plurality of first closing vibration signals; the insulation performance parameter of the insulation layer of the protection switch is obtained; the second aging parameter of the protection switch is determined based on the insulation performance parameter; the target aging parameter of the protection switch is determined based on the first aging parameter and the second aging parameter; and the aging early warning is performed based on the target aging parameter. The application can improve the efficiency of the protection switch aging state detection.

[0178] Please refer to Figure 4 , Figure 4 The structure schematic diagram of the electronic device provided by the embodiment of the application is shown.

[0179] The electronic device can include a processor 101 with one or more processing cores, a memory 102 with one or more computer readable storage media, a power supply 103, and an input unit 104, etc. Those skilled in the art can understand that the structure of the electronic device shown in the figure does not constitute a limitation on the electronic device, and can include more or fewer components than the figure, or combine certain components, or different component arrangements. Among them:

[0180] The processor 101 is the control center of the electronic device, connects all parts of the electronic device through various interfaces and lines, and performs various functions of the electronic device and processes data by running or executing software programs and / or modules stored in the memory 102 and calling data stored in the memory 102. Optionally, the processor 101 can include one or more processing cores; optionally, the processor 101 can integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application program, etc., and the modem processor mainly processes wireless communication. It can be understood that the above-mentioned modem processor can also not be integrated into the processor 101.

[0181] The memory 102 can be used to store software programs and modules, and the processor 101 executes various functions and data processing by running the software programs and modules stored in the memory 102. The memory 102 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application program required by a function (such as a sound playing function, an image playing function, etc.), etc.; the data storage area can store data created according to the use of the electronic device, etc. In addition, the memory 102 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state memory device. Accordingly, the memory 102 can also include a memory controller to provide access for the processor 101 to the memory 102.

[0182] The electronic device also includes a power supply 103 for powering various components. Optionally, the power supply 103 can be logically connected to the processor 101 through a power management system, so as to realize functions such as management of charging, discharging, and power consumption management through the power management system. The power supply 103 can also include one or more than one direct current or alternating current power supply, a recharging system, a power failure detection circuit, a power converter or inverter, a power state indicator, etc. Any element.

[0183] The electronic device can also include an input unit 104, which can be used to receive input digital or character information, and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

[0184] Although not shown, the electronic device can also include a display unit, an image acquisition element, etc., which will not be described here. In particular, in the present embodiment, the processor 101 in the electronic device will load one or more computer programs into the memory 102 according to the following instructions, and execute the steps in the multi-parameter fusion-based protection switch aging monitoring and early warning method provided by the present application by the processor 101, such as:

[0185] Compared with the related art, a plurality of first closing vibration signals of the protection switch during multiple closing operations of the protection switch are acquired; a first aging parameter of the protection switch is determined based on the plurality of first closing vibration signals; an insulation performance parameter of an insulation layer of the protection switch is acquired; a second aging parameter of the protection switch is determined based on the insulation performance parameter; a target aging parameter of the protection switch is determined based on the first aging parameter and the second aging parameter; and an aging warning is performed based on the target aging parameter.

[0186] It should be noted that the electronic device provided by the embodiments of the present application and the protection switch aging monitoring and warning method based on multi-parameter fusion in the above embodiments belong to the same concept, and the specific implementation process is described in detail in the above related embodiments, which will not be described here.

[0187] The present application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by the processor of the electronic device provided by the embodiments of the present application, causes the processor of the electronic device to perform the steps in the protection switch aging monitoring and warning method based on multi-parameter fusion provided by the present application. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM), etc.

[0188] The present application also provides a computer program product or computer program, which includes computer instructions stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes various optional implementations of the above-mentioned protection switch aging monitoring and warning method based on multi-parameter fusion.

[0189] The above provides a detailed introduction to the protection switch aging monitoring and warning method based on multi-parameter fusion, and the principles and implementation manners of the present application are described in this paper. The above embodiment is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation manner and application range will be changed, and the above description should not be understood as a limitation of the present application.

[0190] It should be noted that when the above embodiments of the present application are applied to specific products or technologies, related data of users are involved, and the permission or consent of users needs to be obtained, and the collection, use and processing of related data need to comply with relevant laws, regulations and standards of countries and regions.

Claims

1. A multi-parameter fusion-based protection switch aging monitoring and early warning method, characterized in that, The multi-parameter fusion-based protection switch aging monitoring and early warning method comprises: obtaining a plurality of first closing vibration signals of the protection switch during multiple closing operations; determining a first aging parameter of the protection switch based on the plurality of first closing vibration signals; obtaining an insulation performance parameter of an insulation layer of the protection switch; determining a second aging parameter of the protection switch based on the insulation performance parameter; determining a target aging parameter of the protection switch based on the first aging parameter and the second aging parameter, wherein the temperature of the contact of the protection switch is obtained by a temperature sensor to obtain a temperature change curve; the temperature change curve is linearly fitted to obtain a temperature fitting straight line; the working current passing through the protection switch is detected by a current sensor to obtain a current change curve; a third aging parameter is determined based on the slope of the temperature fitting straight line and the coefficient of variation of the current change curve, wherein the greater the slope of the temperature fitting straight line, the greater the third aging parameter, and the greater the coefficient of variation of the current change curve, the greater the third aging parameter; the target aging parameter of the protection switch is determined based on the first aging parameter, the second aging parameter and the third aging parameter, wherein the coefficient of variation is obtained by first calculating the standard deviation of the current data and then dividing by the average current value; based on the target aging parameter, aging early warning is performed.

2. The multi-parameter fusion based protection switch aging monitoring and early warning method according to claim 1, characterized in that, The first closing vibration signal comprises a vibration frequency and a vibration duration, and the determination of the first aging parameter of the protection switch based on the plurality of first closing vibration signals comprises: obtaining a first frequency average of the vibration frequency in the first closing vibration signal during multiple closing operations and a time average of the vibration duration in the first closing vibration signal during multiple closing operations; determining the first aging parameter based on the first frequency average and the time average, wherein the smaller the first frequency average, the greater the first aging parameter, and the higher the time average, the greater the first aging parameter. 3.The multi-parameter fusion based protection switch aging monitoring and early warning method according to claim 2, characterized in that, The obtaining of the plurality of first closing vibration signals of the protection switch during multiple closing operations comprises: acquiring a vibration signal sequence of the protection switch by a vibration sensor on the protection switch, the vibration signal sequence comprising amplitudes at a plurality of times; obtaining a plurality of power-off times of the protection switch; determining a decay oscillation curve closest to the power-off time in the vibration signal sequence as a second closing vibration signal corresponding to the power-off time to obtain a plurality of second closing vibration signals corresponding to the plurality of power-off times, wherein the decay oscillation curve is a sine function curve with gradually decreasing amplitude to zero; screening a plurality of first closing vibration signals from the plurality of second closing vibration signals.

4. The multi-parameter fusion based protection switch aging monitoring and early warning method according to claim 3, characterized in that, The screening of the plurality of first closing vibration signals from the plurality of second closing vibration signals comprises: determining whether an automatic protection event occurs in the protection circuit within a preset time period before the power-off time, wherein the automatic protection event comprises a leakage time, an overload event and a short circuit time; If an automatic protection event occurs in the protection circuit within a preset period of time before the power-off moment, the second closing vibration signal corresponding to the power-off moment is determined as a third closing vibration signal, and a plurality of third closing vibration signals are obtained. The first closing vibration signals are screened from the plurality of third closing vibration signals.

5. The multi-parameter fusion based protection switch aging monitoring and early warning method according to claim 4, characterized in that, The insulation performance parameters include leakage currents at a plurality of moments and dielectric strengths at a plurality of moments, and the second aging parameter of the protection switch is determined based on the insulation performance parameters, including: Current average values of the leakage currents at a plurality of moments and strength average values of the dielectric strengths at a plurality of moments are calculated. A second aging parameter is determined based on the current average values and the strength average values.

6. A multi-parameter fusion-based protection switch aging monitoring and early warning device, characterized in that, The protection switch aging monitoring and early warning device based on multi-parameter fusion includes: A first acquisition module is configured to acquire a plurality of first closing vibration signals when the protection switch is closed multiple times. A first determination module is configured to determine a first aging parameter of the protection switch based on the plurality of first closing vibration signals. A second acquisition module is configured to acquire insulation performance parameters of an insulation layer of the protection switch. A second determination module is configured to determine a second aging parameter of the protection switch based on the insulation performance parameters. A third determination module is configured to determine a target aging parameter of the protection switch based on the first aging parameter and the second aging parameter, wherein a temperature of a contact of the protection switch is acquired by a temperature sensor to obtain a temperature change curve; the temperature change curve is linearly fitted to obtain a temperature fitting straight line; a working current passing through the protection switch is detected by a current sensor to obtain a current change curve; a third aging parameter is determined based on a slope of the temperature fitting straight line and a variation coefficient of the current change curve, wherein the larger the slope of the temperature fitting straight line is, the larger the third aging parameter is, and the larger the variation coefficient of the current change curve is, the larger the third aging parameter is; the target aging parameter of the protection switch is determined based on the first aging parameter, the second aging parameter, and the third aging parameter, wherein the variation coefficient is obtained by first calculating the standard deviation of the current data and then dividing the current average value; An early warning module is configured to perform aging early warning based on the target aging parameter.

7. An electronic device, comprising: The memory stores a computer program, and the processor is configured to run the computer program in the memory to execute the steps of the protection switch aging monitoring and early warning method based on multi-parameter fusion in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a plurality of instructions, which are suitable for being loaded by the processor to execute the steps of the protection switch aging monitoring and early warning method based on multi-parameter fusion in any one of claims 1 to 5.

9. A computer program product comprising computer programs or instructions, characterized in that, The computer program or instructions are executed by the processor to implement the steps of the protection switch aging monitoring and early warning method based on multi-parameter fusion in any one of claims 1 to 5.

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