Current sensor characteristic measurement method and device, computer and storage medium

Abstract

The invention discloses a current sensor characteristic measurement method and device, a computer and a storage medium. The method comprises the steps that current sensor characteristic evaluation parameters of a to-be-measured current sensor at multiple measurement temperatures are acquired; obtaining a characteristic curve of the to-be-measured current sensor according to the current sensor characteristic evaluation parameters at the plurality of measurement temperatures; and determining a characteristic measurement result of the to-be-measured current sensor according to the characteristic curve of the to-be-measured current sensor, wherein the characteristic measurement result is used for representing whether the current sensor is stable in a low-temperature environment. The current sensor characteristic evaluation parameters of the to-be-measured current sensor at multiple measurement temperatures are obtained, and then the characteristic measurement result of the to-be-measured current sensor is determined according to the characteristic curve obtained by the current sensor characteristic evaluation parameters, so that the accuracy of characteristic measurement of the current sensor is improved.

Description

Technical Field

[0001] The present application relates to the technical field of power equipment state parameter sensing, and in particular to a current sensor characteristic measurement method, device, computer and storage medium. Background Art

[0002] As a monitoring device for partial discharge of power equipment, high-frequency current sensors use Rogowski coils to convert current into voltage and use integral circuits to collect and restore signals. High-frequency current sensors are mainly used to capture and quantify transient pulse currents inside power facilities, thereby indirectly evaluating the degree of partial discharge.

[0003] Low temperature environment will cause the size and structural parameters of the high-frequency current sensor coil skeleton to change, which will in turn affect the change of sensor-related characteristics, causing errors and reducing reliability. The reduction of sensor reliability will lead to an increase in false alarm rate, which will directly bring a heavy burden to equipment maintenance. Therefore, how to more accurately measure the low-temperature characteristics of high-frequency current sensors to help improve the working performance of sensors in low-temperature environments has become a problem that needs to be solved. Summary of the invention

[0004] The embodiments of the present application provide a current sensor characteristic measurement method, device, computer and storage medium, which obtain current sensor characteristic evaluation parameters of the current sensor to be measured at multiple measurement temperatures, and then determine the characteristic measurement result of the current sensor to be measured based on the characteristic curve obtained by the current sensor characteristic evaluation parameters, which is beneficial to improving the accuracy of the current sensor characteristic measurement.

[0005] In a first aspect, an embodiment of the present application provides a current sensor characteristic measurement method, which is applied to a server of a current sensor characteristic measurement system, and the method includes:

[0006] Acquiring current sensor characteristic evaluation parameters of the current sensor to be measured at multiple measurement temperatures;

[0007] Obtaining a characteristic curve of the current sensor to be measured according to characteristic evaluation parameters of the current sensor at the multiple measurement temperatures;

[0008] A characteristic measurement result of the current sensor to be measured is determined according to the characteristic curve of the current sensor to be measured, and the characteristic measurement result is used to indicate whether the current sensor is stable in a low temperature environment.

[0009] In a second aspect, an embodiment of the present application provides a current sensor characteristic measurement device, the device comprising:

[0010] An acquisition module, used for acquiring current sensor characteristic evaluation parameters of the current sensor to be measured at multiple measurement temperatures;

[0011] A processing module is used to obtain a characteristic curve of the current sensor to be measured according to the characteristic evaluation parameters of the current sensor at the multiple measurement temperatures; and to determine a characteristic measurement result of the current sensor to be measured according to the characteristic curve of the current sensor to be measured, wherein the characteristic measurement result is used to indicate whether the current sensor is stable in a low temperature environment.

[0012] In a third aspect, an embodiment of the present application provides a computer, including:

[0013] A memory, a processor, and a current sensor characteristic measurement program stored in the memory and executable on the processor, wherein the current sensor characteristic measurement program is configured to implement part or all of the steps described in any method in the first aspect.

[0014] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a current sensor characteristic measurement program is stored. When the current sensor characteristic measurement program is executed by a processor, some or all of the steps described in any method in the first aspect are implemented.

[0015] In a fifth aspect, an embodiment of the present application provides a computer program product, wherein the computer program product includes a computer program, and the computer program is operable to cause a computer to execute some or all of the steps described in any method of the first aspect of the embodiment of the present application. The computer program product can be a software installation package.

[0016] By implementing the embodiment of the present application, the server of the current sensor characteristic measurement system first obtains the current sensor characteristic evaluation parameters of the current sensor to be measured at multiple measurement temperatures; then obtains the characteristic curve of the current sensor to be measured based on the current sensor characteristic evaluation parameters at multiple measurement temperatures; finally, determines the characteristic measurement result of the current sensor to be measured based on the characteristic curve of the current sensor to be measured, and the characteristic measurement result is used to indicate whether the current sensor is stable in a low temperature environment. By obtaining the current sensor characteristic evaluation parameters of the current sensor to be measured at multiple measurement temperatures, and then determining the characteristic measurement result of the current sensor to be measured based on the characteristic curve obtained from the current sensor characteristic evaluation parameters, it is beneficial to improve the accuracy of the current sensor characteristic measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0018] Figure 1 It is a schematic diagram of the architecture of a current sensor characteristic measurement system provided in an embodiment of the present application;

[0019] Figure 2 is a flow chart of a current sensor characteristic measurement method provided in an embodiment of the present application;

[0020] Figure 3 It is a schematic diagram of the hardware structure of a current sensor characteristic measurement provided in an embodiment of the present application;

[0021] Figure 4 is an amplitude-frequency characteristic curve of a sensor under normal temperature environment provided by an embodiment of the present application;

[0022] Figure 5 It is a schematic diagram of the relationship between the lower cutoff frequency and temperature of different sensors provided in an embodiment of the present application;

[0023] Figure 6 It is a structural schematic diagram of a current sensor characteristic measurement device provided in an embodiment of the present application;

[0024] Figure 7 It is a structural diagram of a computer provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. According to the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0026] The terms "first", "second", "third", etc. in the specification, claims and drawings of this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0027] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] As a monitoring device for partial discharge of power equipment, high-frequency current sensors use Rogowski coils to convert current into voltage, and use integral circuits to collect and restore signals. High-frequency current sensors are mainly used to capture and quantify transient pulse currents inside power facilities, thereby indirectly evaluating the degree of partial discharge. Low temperature environments can cause changes in the size and structural parameters of the coil skeleton of high-frequency current sensors, which in turn affect changes in sensor-related characteristics, causing errors and reducing reliability. Reduced sensor reliability will lead to an increase in the false alarm rate, which will directly impose a heavy burden on equipment maintenance. Therefore, how to more accurately measure the low-temperature characteristics of high-frequency current sensors to help improve the working performance of sensors in low-temperature environments has become a problem that needs to be solved.

[0029] In response to the above problems, the embodiments of the present application provide a current sensor characteristic measurement method, device, equipment, storage medium and program product. The server of the current sensor characteristic measurement system first obtains the current sensor characteristic evaluation parameters of the current sensor to be measured at multiple measurement temperatures; then obtains the characteristic curve of the current sensor to be measured based on the current sensor characteristic evaluation parameters at multiple measurement temperatures; finally, the characteristic measurement result of the current sensor to be measured is determined based on the characteristic curve of the current sensor to be measured, and the characteristic measurement result is used to indicate whether the current sensor is stable in a low temperature environment. By obtaining the current sensor characteristic evaluation parameters of the current sensor to be measured at multiple measurement temperatures, and then determining the characteristic measurement result of the current sensor to be measured based on the characteristic curve obtained from the current sensor characteristic evaluation parameters, it is beneficial to improve the accuracy of the current sensor characteristic measurement.

[0030] The current sensor characteristic measurement method, device, equipment, storage medium and program product provided in the embodiments of the present application can be applied to Figure 1 The current sensor characteristics shown in the measurement system are shown in Figure 1 , Figure 1 This is a schematic diagram of the architecture of a current sensor characteristic measurement system provided in an embodiment of the present application. The current sensor characteristic measurement system 100 includes a terminal 101 and a server 102. The terminal 101 can communicate with the server 102 through a network. The terminal 101 refers to a device used by a user, such as a smart phone, a computer, etc. In this solution, the terminal 101 provides an interface for the user to interact with the current sensor characteristic measurement system 100. Through the terminal 101, the user can interact with the current sensor characteristic measurement system 100, receive the characteristic curve and characteristic measurement results of the current sensor to be measured that are processed and calculated from the server 102, and display them on the user interface. The user can also adjust multiple thresholds set through the terminal 101.

[0031] Server 102 refers to a remote computer used to process a large number of computing tasks and store data. In this solution, server 102 is mainly responsible for data processing, storage and calculation. Specifically, server 102 receives and collects characteristic evaluation parameter data of current sensors at multiple temperatures, and manages and stores them in a unified manner. On this basis, server 102 also uses the corresponding algorithm to obtain the characteristic curve of the current sensor to be measured based on the characteristic evaluation parameter data of the current sensor at multiple temperatures. In addition, server 102 can also determine whether the current sensor to be measured is stable in a low temperature environment based on its characteristic curve, and generate corresponding characteristic measurement results. At the same time, server 102 is used to send the calculated characteristic measurement results to terminal 101 for user reference.

[0032] Based on this, the present application provides a current sensor characteristic measurement method, device, equipment, storage medium and program product, and the present application is described in detail below in conjunction with the accompanying drawings.

[0033] See also Figure 2 , Figure 2 is a flow chart of a current sensor characteristic measurement method provided in an embodiment of the present application, such as Figure 2 As shown, the method comprises the following steps:

[0034] S201, obtaining current sensor characteristic evaluation parameters of a current sensor to be measured at multiple measurement temperatures.

[0035] Among them, the characteristic evaluation parameters of the current sensor include amplitude-frequency parameters and transmission impedance parameters. Specifically, the amplitude-frequency characteristics (Frequency Response Characteristic) describe the response of the current sensor to the change of the input signal amplitude at different frequencies. Generally speaking, the amplitude-frequency characteristics of the current sensor should be flat, that is, maintain a relatively stable gain in the entire operating frequency range. If there is attenuation or distortion of the amplitude-frequency characteristics, it will cause deviation or distortion in the measurement results. Therefore, when selecting a current sensor, it is necessary to consider whether its amplitude-frequency characteristics meet the actual needs and ensure that it has a good linear response within the required operating frequency range. Transmission impedance (Trans impedance) refers to the equivalent AC impedance between the output port of the current sensor and the load. Transmission impedance reflects the loss and influence generated when the current signal is transferred from the sensor to the load. Generally speaking, the current sensor should have a low transmission impedance to maximize the signal transfer efficiency and reduce energy loss. The low transmission impedance can also reduce the additional load or influence on the system or device under test.

[0036] In a possible implementation, the step of obtaining a current sensor characteristic evaluation parameter of the current sensor to be measured at a plurality of measurement temperatures includes:

[0037] A plurality of measurement temperatures are obtained within a target temperature range according to a target temperature interval and a standard temperature; at the plurality of measurement temperatures, the current amplitude of the signal output by the signal generator is kept constant, the frequency of the output signal is adjusted, and the voltage amplitude of the signal corresponding to the frequency received by the oscilloscope is recorded to obtain an amplitude-frequency parameter; at the plurality of measurement temperatures, the current amplitude of the signal output by the signal generator is kept constant, and a transmission impedance parameter is obtained by obtaining a ratio of a voltage amplitude of the signal corresponding to the target frequency received by the oscilloscope when the frequency of the output signal is the target frequency to a current amplitude of the signal output by the signal generator.

[0038] The target temperature interval may be 5 degrees Celsius, 10 degrees Celsius and 15 degrees Celsius, and the standard temperature may be 20 degrees Celsius. The target temperature interval and the standard temperature may be set by the user at the terminal 101 and are not limited here.

[0039] Preferably, the standard temperature is 20 degrees Celsius.

[0040] Among them, in order to obtain multiple measurement temperatures according to the target temperature interval and the standard temperature, the low-temperature characteristics experimental platform can be used to adjust and control the temperature. Specifically, the temperature characteristics experimental platform is mainly composed of a low-temperature environment simulation chamber, a low-temperature infrared imaging unit, a dehumidification unit, a partial discharge simulation signal feeding unit and a sensor signal extraction unit. The low-temperature environment simulation chamber is used to provide a temperature-adjustable simulated low-temperature environment for measuring the low-temperature characteristics of the high-frequency current sensor. The partial discharge simulation signal feeding unit is used to simulate the partial discharge signal; the partial discharge simulation signal feeding unit structure is composed of a programmable signal generator, an external connecting line, a coaxial interface installed in the chamber and an internal current feeder, which is used to provide a partial discharge simulation signal; the low-temperature infrared imaging unit and the dehumidification unit are used to realize the regulation of the preset temperature and humidity in the low-temperature environment simulation chamber.

[0041] Among them, see Figure 3 , Figure 3 is a schematic diagram of a hardware structure of a current sensor characteristic measurement provided by an embodiment of the present application, such as Figure 3 As shown in the figure, during the test, the high-frequency current sensor to be measured is placed in the low-temperature test box of the low-temperature characteristic test platform, the signal generator loop is connected in series with a 100Ω matching resistor, the signal line is connected to the high-frequency current sensor through the heart, and is fixed to the center of the sensor ring structure with foam plastic, and the output end of the high-frequency sensor is connected to the pico acquisition card and the oscilloscope respectively, the pico acquisition card is used to collect the sensor output signal, and the oscilloscope is used to observe the sensor output signal and record the voltage amplitude of the output signal.

[0042] Among them, when measuring the amplitude-frequency characteristics, the measurement method is: at multiple measurement temperatures, by adjusting the frequency of the signal output by the signal generator, keep its current amplitude constant; connect the signal generator to the current sensor, and connect the oscilloscope to the output port of the current sensor; gradually adjust the frequency of the signal output signal of the signal generator, and record the voltage amplitude of the corresponding frequency signal received by the oscilloscope; obtain the amplitude-frequency characteristic parameters of the sensor to be measured based on the recorded voltage amplitude and the corresponding frequency data, and draw the amplitude-frequency characteristic curve of the current sensor at different frequencies based on the amplitude-frequency characteristic parameters.

[0043] Among them, when measuring the transmission impedance, the measurement method is: at multiple measurement temperatures, by adjusting the frequency of the signal generator output signal, keep its current amplitude constant; connect the oscilloscope to the current sensor output port, and select a target frequency; adjust the frequency of the signal generator output signal until the target frequency is reached, and in this process record the corresponding voltage amplitude when the oscilloscope receives the target frequency signal; compare and calculate the voltage amplitude received by the oscilloscope at the target frequency with the current amplitude of the signal generator output signal to obtain the transmission impedance parameters.

[0044] The target frequency can be set by the user at the terminal 101. Preferably, the signal generator outputs a signal frequency in the range of 100kHz-50MHz, and the target frequency is 10MHz.

[0045] Specifically, by detecting the amplitude-frequency characteristics of the high-frequency current sensor, the effective working frequency bandwidth of the sensor can be tested, requiring the lower cutoff frequency f1 of the bandwidth to be ≤1MHz and the upper cutoff frequency fh to be ≥20MHz; the transmission impedance reflects the signal coupling ability of the sensor under a certain frequency signal within the effective working frequency band, and the sensor transmission impedance is obtained by calculating the ratio of the voltage amplitude of the oscilloscope received signal to the current amplitude of the signal generator output signal when the frequency is 10MHz.

[0046] It can be seen that in this example, by measuring the amplitude-frequency parameters and transmission impedance parameters at multiple measurement temperatures, the performance of the current sensor under different working conditions can be fully understood, which is conducive to evaluating its stability, accuracy and reliability, and determining its scope of application.

[0047] In a possible implementation, obtaining a plurality of measured temperatures within the target temperature interval according to the target temperature interval and the standard temperature includes:

[0048] A plurality of first temperature interval measured temperatures are obtained in the first temperature interval according to the first temperature interval and the standard temperature; it is determined whether there is a measured temperature located in the second temperature interval among the plurality of first temperature interval measured temperatures; if it is detected that there is a measured temperature located in the second temperature interval among the plurality of first temperature interval measured temperatures, a plurality of second temperature interval measured temperatures less than the measured temperature located in the second temperature interval are obtained in the second temperature interval according to the second temperature interval and the measured temperature located in the second temperature interval; if it is detected that there is no measured temperature located in the second temperature interval among the plurality of first temperature interval measured temperatures, a plurality of second temperature interval measured temperatures are obtained in the second temperature interval according to the second temperature interval and the first boundary temperature; a plurality of measured temperatures are obtained according to the first temperature interval measured temperature and the second temperature interval measured temperature.

[0049] Among them, the target temperature range includes a first temperature range in which the temperature is lower than the first boundary temperature and not lower than the second boundary temperature, and a second temperature range in which the temperature is lower than the third boundary temperature and not lower than the first boundary temperature. The target temperature interval includes a first temperature interval corresponding to the first temperature interval and a second temperature interval corresponding to the second temperature interval, and the standard temperature is within the second temperature interval.

[0050] For example, the standard temperature is 15°C, the first temperature range is 10°C-20°C, the first temperature interval is 5°C, the second temperature range is 20°C-30°C, and the second temperature interval is 4°C. According to the above parameters and requirements, the following steps are performed:

[0051] In the first temperature interval, a plurality of first temperature interval measurement temperatures are obtained according to the first temperature interval and the standard temperature. According to the parameters in this example, the calculated first temperature interval measurement temperature is 20°C, and it is determined whether there is a measurement temperature in the second temperature interval, and it is checked whether there is a measurement value in the second temperature interval among the plurality of first temperature interval measurement temperatures.

[0052] Preferably, the test environment temperature range is -50°C to 20°C, the temperature step length is 5°C in the range of 0 to 20°C, and the temperature step length is 2°C in the range of -50°C to 0°C.

[0053] It can be seen that in this example, by flexibly obtaining multiple test temperatures according to the first temperature interval, the second temperature interval and the temperature intervals corresponding to the two temperature intervals, and combining the judgment and analysis process, it can help evaluate and understand the performance characteristics and stability of the sensor under different working conditions.

[0054] In a possible implementation, adjusting the frequency of the output signal includes:

[0055] Receive a target signal frequency interval and a target signal frequency range from a terminal; adjust the step speed and increment value of a phase accumulator in a digital frequency synthesizer according to the target signal frequency interval, and generate a plurality of output signals with different frequencies within the target signal frequency range.

[0056] The target signal frequency interval and the target signal frequency range are set by the user at the terminal 101. For example, if a new output signal is desired to be generated every 100 Hz, the target signal frequency interval is 100 Hz. If an output signal is desired to be generated between 10 kHz and 20 kHz, the target signal frequency range is 10 kHz to 20 kHz.

[0057] Among them, the specific steps of adjusting the output signal frequency are as follows: determine the target signal frequency interval and the target signal frequency range according to the user setting or input; calculate how many output signals of different frequencies need to be generated, as well as the step speed and increment value; configure the digital frequency synthesizer and set the initial state; control the digital clock cycle by increasing or decreasing the phase accumulator, and calculate which specific angle / position should be obtained in the current state (i.e. corresponding to a specific output frequency); convert the calculated angle / position into a voltage or digital coding form as the output corresponding to the specific output frequency generated by the specific angle / position in a new cycle and send it to the analog analysis display device; after the cycle ends, obtain a performance feedback effect chart within the target signal frequency range.

[0058] It can be seen that in this example, according to the set target signal frequency interval, multiple output signals with different frequencies are generated within the target signal frequency interval. A series of continuously adjustable and evenly distributed output signals can be obtained to meet the performance evaluation, analysis or testing requirements for widely or continuously covering different amplitude responses within a certain range.

[0059] S202: Obtain a characteristic curve of the current sensor to be measured according to characteristic evaluation parameters of the current sensor at the multiple measurement temperatures.

[0060] The characteristic curves include an amplitude-frequency characteristic curve and a transmission impedance curve.

[0061] In a possible implementation, obtaining a characteristic curve of the current sensor to be measured according to characteristic evaluation parameters of the current sensor at the multiple measurement temperatures includes:

[0062] According to the characteristic evaluation parameters, target voltage amplitude data received by the oscilloscope at different signal generator frequencies are obtained; the signal generator frequency is used as the horizontal axis and the voltage amplitude data received by the oscilloscope is used as the vertical axis, and a plurality of first data points are plotted in a coordinate system according to the target voltage amplitude data received by the oscilloscope at the different signal generator frequencies; the amplitude-frequency characteristic curve of the current sensor to be measured is obtained by connecting the plurality of first data points; the transmission impedance parameters of the current sensor to be measured at different temperatures are obtained according to the characteristic evaluation parameters; the temperature is used as the horizontal axis and the transmission impedance parameters of the current sensor to be measured are used as the vertical axis, and a plurality of second data points are plotted in a coordinate system according to the transmission impedance parameters of the current sensor to be measured at the different temperatures; the transmission impedance curve of the current sensor to be measured is obtained by connecting the plurality of second data points.

[0063] Among them, see Figure 4 , Figure 4 is a sensor amplitude-frequency characteristic curve under normal temperature environment provided by an embodiment of the present application, such as Figure 4 As shown, under a normal temperature of 20°C, the amplitude of the signal output from the signal generator is kept constant, and the frequency of the output signal is adjusted to a frequency range of 100kHz-50MHz. During measurement, the step size is dynamically adjusted according to the change in the output signal amplitude, and the frequency of the signal generator output signal and the voltage amplitude of the oscilloscope receiving signal are recorded to obtain the amplitude-frequency characteristic curve of the current sensor to be measured.

[0064] Among them, see Figure 5 , Figure 5 is a schematic diagram of the relationship between the lower cutoff frequency and temperature of different sensors provided in the embodiment of the present application, such as Figure 5 As shown, the high-frequency current sensors to be measured include HFCT1, HFCT2 and HFCT3. This scheme uses a low-temperature characteristic test platform to set a specific ambient low temperature. After reaching the set temperature, it needs to be maintained for 30 minutes before starting the measurement; when starting the measurement, the frequency range of the simulated partial discharge signal output by the signal generator is set to 100kHz~50MHz, and the signal frequency step is dynamically adjusted according to the change of the output signal amplitude. The amplitude of the oscilloscope receiving signal at each specific frequency is measured, and the amplitude-frequency characteristic curve of the high-frequency current sensor to be measured is drawn, and the transmission impedance is calculated; the ambient temperature is changed, and the above measurement process is repeated to draw the sensor amplitude-frequency characteristic curve at the temperature, and the transmission impedance is calculated; the transmission impedance at different temperatures is summarized, and the transmission impedance curve of the high-frequency current sensor to be measured is drawn. After completing the performance parameter measurement of all temperatures, the upper and lower cut-off frequencies at each temperature are summarized, and the relationship curve between the upper and lower cut-off frequencies and the temperature is drawn, and finally the relationship between the lower cut-off frequency and the temperature of different high-frequency current sensors to be measured is obtained.

[0065] It can be seen that in this example, by obtaining the target voltage amplitude data received by the oscilloscope at different signal generator frequencies and plotting multiple first data points in the coordinate system, the amplitude-frequency characteristic curve of the current sensor to be measured can be obtained, and the response of the current sensor at different frequencies can be fully understood, and its sensitivity, linearity, bandwidth and other characteristics can be evaluated. By obtaining the characteristic evaluation parameters of the current sensor to be measured at different temperatures, and calculating the transmission impedance data based on these parameters, these data are plotted in the coordinate system. Multiple second data points and connected to obtain the transmission impedance curve of the current sensor to be measured, it is helpful to understand and compare the loss and impact of the sensor when it is transferred to the load system under different temperature conditions.

[0066] S203: Determine a characteristic measurement result of the current sensor to be measured according to a characteristic curve of the current sensor to be measured.

[0067] The characteristic measurement result is used to indicate whether the current sensor is stable in a low temperature environment.

[0068] Specifically, by detecting the amplitude-frequency characteristics of the high-frequency current sensor, the effective working frequency bandwidth of the sensor can be tested, requiring the lower cut-off frequency fl≤1MHz and the upper cut-off frequency fh≥20MHz of the bandwidth; the transmission impedance reflects the signal coupling ability of the sensor under a certain frequency signal within the effective working frequency band, and the sensor transmission impedance is obtained by calculating the ratio of the voltage amplitude of the oscilloscope received signal to the current amplitude of the signal generator output signal when the frequency is 10MHz.

[0069] In a possible implementation manner, determining a characteristic measurement result of the current sensor to be measured according to a characteristic curve of the current sensor to be measured includes:

[0070] A first characteristic measurement result is obtained by comparing the amplitude deviation of the amplitude-frequency characteristic curve at different temperatures and the target amplitude deviation threshold; a second characteristic measurement result is obtained by comparing the curve slope at each temperature in the transmission impedance curve and the target slope; and a characteristic measurement result of the current sensor to be measured is obtained based on the first characteristic measurement result and the second characteristic measurement result.

[0071] In a possible implementation, obtaining a first characteristic measurement result by comparing the amplitude deviation of the amplitude-frequency characteristic curve at different temperatures with a target amplitude deviation threshold includes:

[0072] Obtain the degree of deviation of the voltage amplitude data of the amplitude-frequency characteristic curve at a first temperature and the amplitude-frequency characteristic curve at a second temperature at each signal generator frequency, wherein the interval between the first temperature and the second temperature is the target temperature interval; and when it is detected that the degree of deviation is greater than a target amplitude deviation threshold, determine that the first characteristic measurement result is that the amplitude-frequency characteristic of the current sensor to be measured is abnormal.

[0073] Among them, the target amplitude deviation threshold is set by the user at the terminal 101. Specifically, the two amplitude-frequency characteristic curves are compared, and the corresponding voltage amplitude data are compared at each signal generator frequency. The voltage amplitude deviation degree of the two amplitude-frequency characteristic curves at each signal generator frequency is calculated. For example, the difference or relative error between the two amplitudes can be calculated to measure the degree of deviation. Determine whether the obtained degree of deviation is greater than the target amplitude deviation threshold. If it is greater than the threshold, it is determined that the first characteristic measurement result is an abnormality in the amplitude-frequency characteristic of the current sensor to be measured; if it is less than or equal to the threshold, it is considered that there is no abnormality.

[0074] It can be seen that in this example, by comparing the amplitude-frequency characteristic curves at different temperatures, the stability of the response of the current sensor to be measured under different temperature conditions can be evaluated. If the degree of deviation is greater than the target amplitude deviation threshold, it may indicate that the sensor is sensitive to temperature changes or its response is affected, which is beneficial to improve the accuracy of the current sensor characteristic measurement.

[0075] In a possible implementation, obtaining a second characteristic measurement result by comparing a curve slope at each temperature in the transmission impedance curve with a target slope includes:

[0076] The slope of the curve at each temperature in the transmission impedance curve is obtained; when it is detected that the slope of the curve is greater than the target slope, it is determined that the second characteristic measurement result is that the transmission impedance of the current sensor to be measured is abnormal.

[0077] Among them, the target slope can be set by the user at the terminal 101. For example, the target slope is 0.5, and the data of each point in the transmission impedance curve are as follows: the transmission impedance at a temperature of 20°C is 10Ω, the transmission impedance at a temperature of 25°C is 12 ohms, the transmission impedance at a temperature of 30°C is 15Ω, and the transmission impedance at a temperature of 35°C is 18Ω. According to the above multiple data points, it is determined that the maximum slope of the curve is 0.6, which is greater than the target slope of 0.5. At this time, it is considered that the current sensor to be measured has a transmission impedance abnormality within the corresponding temperature range.

[0078] It can be seen that in this example, by comparing the curve slope at each temperature in the transfer impedance curve with the preset target slope, it can be directly concluded whether there is an abnormality in the current sensor to be measured based on the comparison result, which is conducive to improving the efficiency and accuracy of the current sensor characteristic evaluation.

[0079] In a possible implementation, the method further includes:

[0080] A plurality of measurement temperatures are obtained according to a second temperature interval within a target temperature range, and a standard deviation of the output signal of the current sensor to be measured when the frequency of the output signal is the target frequency at each of the plurality of measurement temperatures is obtained to obtain a corresponding relationship between the temperature and the standard deviation of the output signal; according to the corresponding relationship between the temperature and the standard deviation of the output signal, it is detected that the discreteness of the output signal is greater than a target discreteness threshold, and / or the deviation degree of the standard deviation of the output signal at two measurement temperatures separated by the second temperature interval exceeds a target standard deviation deviation threshold, and it is determined that the characteristic measurement result of the current sensor to be measured is that the stability of the current sensor to be measured is poor.

[0081] Among them, the target temperature interval and the second temperature interval can be set by the user in the terminal 101. Specifically, when the target temperature interval is -50℃-20℃ and the second temperature interval is 10℃, 8 temperature points are selected for analysis in the temperature range of -50℃ to 20℃ with a step length of 10℃. The sensor output under the simulated partial discharge signal frequency of 10MHz is measured multiple times at each temperature, and the output standard deviation is calculated to obtain the relationship between the ambient temperature and the signal standard deviation. At a certain temperature, the larger the signal standard deviation, the stronger the signal discreteness, and the worse the stability of the sensor at this temperature, so as to judge the influence of temperature on the stability of the sensor.

[0082] Among them, before performing multiple measurements to obtain sensor outputs and calculating the output standard deviation based on the sensor outputs, a preprocessing operation is performed on the obtained sensor outputs. The preprocessing operation may be filtering, removing outliers, data correction, data interpolation and filling, etc. For example, an outlier removal operation is performed on the sensor outputs obtained by multiple measurements, and statistical methods, threshold settings or clustering algorithms are used to identify and eliminate abnormal data points that may be caused by faults, interference or errors, so as to avoid subsequent interference with the calculation of the output standard deviation.

[0083] It can be seen that in this example, by obtaining the standard deviation of the output signal of the current sensor to be measured at different measurement temperatures, the stability of the sensor in a specific temperature range can be quantitatively evaluated, which is conducive to improving the accuracy of the current sensor characteristic measurement.

[0084] In a possible implementation, the method further includes:

[0085] After determining the characteristic measurement result of the current sensor to be measured according to the characteristic curve of the current sensor to be measured, a prompt message is sent.

[0086] Among them, prompts are sent to users via email, text messages, mobile application push notifications, online platform messages, and phone notifications, and the prompt information can be text messages or graphic messages.

[0087] For example, assume that the user specifies the mobile phone number X to receive the prompt information in the terminal settings. Then, when the current sensor characteristic measurement system determines the characteristic measurement result of the current sensor to be measured, it can send the following plain text message as a prompt message: "The current characteristic measurement result is that the amplitude-frequency characteristic of the current sensor to be measured is abnormal". This plain text message will be sent to the user via the mobile phone number X preset by the user. After receiving the message, the user will know that the current sensor characteristic measurement task has been successfully completed, and can further view related results or perform other operations.

[0088] It can be seen that in this example, by sending prompt information to the user, the user can quickly obtain the results of the current sensor characteristic measurement, and the user experience is enhanced through the real-time feedback mechanism.

[0089] See also Figure 6 , Figure 6 is a schematic diagram of the structure of a current sensor characteristic measurement device provided in an embodiment of the present application, such as Figure 6 As shown, the current sensor characteristic measuring device 600 includes:

[0090] An acquisition module 601 is used to acquire current sensor characteristic evaluation parameters of the current sensor to be measured at multiple measurement temperatures;

[0091] The processing module 602 is used to obtain a characteristic curve of the current sensor to be measured according to the characteristic evaluation parameters of the current sensor at the multiple measurement temperatures; and to determine a characteristic measurement result of the current sensor to be measured according to the characteristic curve of the current sensor to be measured, wherein the characteristic measurement result is used to indicate whether the current sensor is stable in a low temperature environment.

[0092] In a possible implementation, the current sensor characteristic evaluation parameters include amplitude-frequency parameters and transmission impedance parameters. In terms of obtaining the current sensor characteristic evaluation parameters of the current sensor to be measured at multiple measurement temperatures, the acquisition module 601 is specifically used to: obtain multiple measurement temperatures within the target temperature range according to the target temperature interval and the standard temperature; at the multiple measurement temperatures, keep the current amplitude of the signal generator output signal constant, adjust the frequency of the output signal, record the voltage amplitude of the oscilloscope receiving the corresponding frequency signal, and obtain the amplitude-frequency parameters; at the multiple measurement temperatures, keep the current amplitude of the signal generator output signal constant, and obtain the transmission impedance parameters by obtaining the ratio of the voltage amplitude of the oscilloscope receiving the corresponding target frequency signal when the output signal frequency is the target frequency to the current amplitude of the signal generator output signal.

[0093] In a possible implementation, the target temperature interval includes a first temperature interval having a temperature less than a first boundary temperature and not less than a second boundary temperature and a second temperature interval having a temperature less than a third boundary temperature and not less than the first boundary temperature, the target temperature interval includes a first temperature interval corresponding to the first temperature interval and a second temperature interval corresponding to the second temperature interval, the standard temperature is located in the second temperature interval, and in terms of obtaining multiple measured temperatures in the target temperature interval according to the target temperature interval and the standard temperature, the processing module 602 is specifically used to: obtain multiple first temperature interval measured temperatures in the first temperature interval according to the first temperature interval and the standard temperature; determine whether there is a measured temperature located in the second temperature interval among the multiple first temperature interval measured temperatures; if it is detected that there is a measured temperature located in the second temperature interval among the multiple first temperature interval measured temperatures, then obtain multiple second temperature interval measured temperatures less than the measured temperature located in the second temperature interval according to the second temperature interval and the measured temperature located in the second temperature interval; if it is detected that there is no measured temperature located in the second temperature interval among the multiple first temperature interval measured temperatures, then obtain multiple second temperature interval measured temperatures in the second temperature interval according to the second temperature interval and the measured temperature located in the second temperature interval; if it is detected that there is no measured temperature located in the second temperature interval among the multiple first temperature interval measured temperatures, then obtain multiple second temperature interval measured temperatures in the second temperature interval according to the second temperature interval and the first boundary temperature; and obtain multiple measured temperatures according to the first temperature interval measured temperature and the second temperature interval measured temperature.

[0094] In one possible implementation, in terms of adjusting the frequency of the output signal, the processing module 602 is specifically used to: receive a target signal frequency interval and a target signal frequency range from the terminal; adjust the step speed and increment value of the phase accumulator in the digital frequency synthesizer according to the target signal frequency interval, and generate multiple output signals of different frequencies within the target signal frequency range.

[0095] In a possible implementation, the characteristic curve includes an amplitude-frequency characteristic curve and a transmission impedance curve. In terms of obtaining the characteristic curve of the current sensor to be measured according to the characteristic evaluation parameters of the current sensor at the multiple measurement temperatures, the processing module 602 is specifically used to: obtain the target voltage amplitude data received by the oscilloscope at different signal generator frequencies according to the characteristic evaluation parameters; use the signal generator frequency as the horizontal axis and the voltage amplitude data received by the oscilloscope as the vertical axis, and draw a plurality of first data points in a coordinate system according to the target voltage amplitude data received by the oscilloscope at the different signal generator frequencies; obtain the amplitude-frequency characteristic curve of the current sensor to be measured by connecting the plurality of first data points; obtain the transmission impedance parameters of the current sensor to be measured at different temperatures according to the characteristic evaluation parameters; use the temperature as the horizontal axis and the transmission impedance parameters of the current sensor to be measured as the vertical axis, and draw a plurality of second data points in a coordinate system according to the transmission impedance parameters of the current sensor to be measured at the different temperatures; and obtain the transmission impedance curve of the current sensor to be measured by connecting the plurality of second data points.

[0096] In a possible implementation, in terms of determining the characteristic measurement result of the current sensor to be measured based on the characteristic curve of the current sensor to be measured, the processing module 602 is specifically used to: obtain a first characteristic measurement result by comparing the amplitude deviation of the amplitude-frequency characteristic curve at different temperatures and a target amplitude deviation threshold; obtain a second characteristic measurement result by comparing the slope of the curve at each temperature in the transmission impedance curve and the target slope; and obtain the characteristic measurement result of the current sensor to be measured based on the first characteristic measurement result and the second characteristic measurement result.

[0097] In one possible implementation, in terms of obtaining a first characteristic measurement result by comparing the amplitude deviation of the amplitude-frequency characteristic curve at different temperatures with a target amplitude deviation threshold, the processing module 602 is specifically used to: obtain the degree of deviation of the voltage amplitude data of the amplitude-frequency characteristic curve at a first temperature and the amplitude-frequency characteristic curve at a second temperature at each signal generator frequency, the interval between the first temperature and the second temperature being the target temperature interval; and when it is detected that the deviation degree is greater than the target amplitude deviation threshold, determine that the first characteristic measurement result is that the amplitude-frequency characteristic of the current sensor to be measured is abnormal.

[0098] In one possible implementation, in terms of obtaining the second characteristic measurement result by comparing the slope of the curve at each temperature in the transmission impedance curve with the target slope, the processing module 602 is specifically used to: obtain the slope of the curve at each temperature in the transmission impedance curve; detect that the slope of the curve is greater than the target slope, and determine that the second characteristic measurement result is that the transmission impedance of the current sensor to be measured is abnormal.

[0099] In a possible implementation, the processing module 602 is also used to: obtain multiple measurement temperatures within the target temperature range according to the second temperature interval, obtain the standard deviation of the output signal of the current sensor to be measured when the output signal frequency is the target frequency at each measurement temperature in the multiple measurement temperatures, and obtain the corresponding relationship between the temperature and the standard deviation of the output signal; detect according to the corresponding relationship between the temperature and the standard deviation of the output signal that the discreteness of the output signal is greater than the target discreteness threshold, and / or the deviation degree of the standard deviation of the output signal at two measurement temperatures separated by the second temperature interval exceeds the target standard deviation deviation threshold, and determine that the characteristic measurement result of the current sensor to be measured is that the current sensor to be measured has poor stability.

[0100] It is worth noting that the specific functional implementation of the current sensor characteristic measurement device 600 is shown in the above Figure 2 The description of the current sensor characteristic measurement method shown in the figure, for example, the acquisition module 601 is used to implement the relevant content of executing S201, and the processing module 602 is used to implement the relevant content of executing S202-S203. The various units or modules in the current sensor characteristic measurement device 600 can be respectively or completely combined into one or several other units or modules to form, or one (some) of the units or modules can be further divided into multiple functionally smaller units or modules to form, which can achieve the same operation without affecting the realization of the technical effects of the embodiments of the present invention. The above-mentioned units or modules are divided according to logical functions. In actual applications, the functions of one unit (or module) are implemented by multiple units (or modules), or the functions of multiple units (or modules) are implemented by one unit (or module).

[0101] According to the description of the above method embodiment and related device embodiment, please refer to Figure 7 , Figure 7 It is a schematic diagram of the structure of a computer 700 provided in an embodiment of the present application. Figure 7 The computer 700 shown includes a processor 701 , a memory 702 , a communication interface 703 and a bus 704 . The processor 701 , the memory 702 , and the communication interface 703 are connected to each other through the bus 704 .

[0102] Optionally, the memory 702 is a ROM, a static storage device, a dynamic storage device or a RAM.

[0103] The memory 702 can store executable program codes. When the executable program codes stored in the memory 702 are executed by the processor 701, the processor 701 and the communication interface 703 are used to execute Figure 2 The various steps of the current sensor characteristic measurement method of the illustrated embodiment.

[0104] The processor 701 adopts a general-purpose CPU, a microprocessor, an application-specific integrated circuit ASIC, a GPU or one or more integrated circuits to execute relevant programs to perform the current sensor characteristic measurement method of the method embodiment of the present application.

[0105] The processor 701 can also be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the current sensor characteristic measurement method of the present application can be completed by the hardware integrated logic circuit or software instructions in the processor 701. Optionally, the processor 701 is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware component. The processor can implement or execute the methods, steps and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor is a microprocessor or the processor is any conventional processor, etc. The steps of the method disclosed in the embodiment of the present application can be directly embodied as a hardware decoding processor to execute, or a combination of hardware and software modules in the decoding processor to execute. The optional software module is located in a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register or other mature storage media in the art. The storage medium is located in the memory 702, and the processor 701 reads the information in the memory 702, and combines its hardware to complete the functions required to be performed by the modules included in a current sensor characteristic measurement device 600 in an embodiment of the present application, or executes the current sensor characteristic measurement method in the method embodiment of the present application.

[0106] The communication interface 703 uses a transceiver or other related device such as, but not limited to, a transceiver.

[0107] The bus 704 may include a path for transmitting information between various components of the computer 700 (eg, the memory 702 , the processor 701 , and the communication interface 703 ).

[0108] It should be noted that although Figure 7 The computer 700 shown only shows a memory, a processor, and a communication interface, but in the specific implementation process, those skilled in the art should understand that the computer 700 also includes other devices necessary for normal operation. At the same time, according to specific needs, those skilled in the art should understand that the computer 700 may also include hardware devices for implementing other additional functions. In addition, those skilled in the art should understand that the computer 700 may also include only the devices necessary to implement the embodiments of the present application, and does not necessarily include Figure 7 All devices shown in .

[0109] An embodiment of the present application provides a computer-readable storage medium, in which a computer program for electronic data exchange is stored. The computer program includes execution instructions, and the execution instructions are used to execute part or all of the steps of any current sensor characteristic measurement method recorded in the above-mentioned current sensor characteristic measurement method embodiment. The above-mentioned computer includes an electronic terminal device.

[0110] An embodiment of the present application provides a computer program product, wherein the computer program product includes a computer program, and the computer program can be operated to enable a computer to perform part or all of the steps of any current sensor characteristic measurement method recorded in the above method embodiments. The computer program product can be a software installation package.

[0111] It should be noted that, for the sake of simplicity, for any of the above-mentioned embodiments of the current sensor characteristic measurement method, they are all expressed as a series of action combinations, but those skilled in the art should be aware that this application is not limited by the described order of actions, because according to this application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by this application.

[0112] The embodiments of the present application are introduced in detail above. In this article, specific examples are used to illustrate the principles and implementation methods of a current sensor characteristic measurement method, device, equipment, storage medium and program product of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​a current sensor characteristic measurement method, device, equipment, storage medium and program product of the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

[0113] The present application is described with reference to the flowcharts and / or block diagrams of the methods, hardware products, and computer program products of the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0114] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 The memory may include: a flash disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0115] Although the present application is described herein in conjunction with various embodiments, in the process of implementing the claimed application, those skilled in the art may understand and implement other variations of the disclosed embodiments by viewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "one" does not exclude multiple situations. Certain measures are recorded in different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

[0116] A person skilled in the art can understand that all or part of the steps in the various methods of the above-mentioned method embodiments of the current sensor characteristic measurement method can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable memory, and the memory can include: a flash drive, a read-only memory (English: Read-OnlyMemory, abbreviated as: ROM), a random access memory (English: Random Access Memory, abbreviated as: RAM), a disk or an optical disk, etc.

[0117] It can be understood that any product that is controlled or configured to execute the processing method of the flowchart described in an embodiment of a current sensor characteristic measurement method of the present application, such as the device and computer program product of the above flowchart, belongs to the category of related products described in the present application.

[0118] Obviously, those skilled in the art can make various changes and modifications to the current sensor characteristic measurement method, device, equipment, storage medium and program product provided by the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

1. A method for measuring characteristics of a current sensor, characterized in that: A server applied to a current sensor characteristic measurement system, the method comprising: Acquiring current sensor characteristic evaluation parameters of the current sensor to be measured at multiple measurement temperatures; Obtaining a characteristic curve of the current sensor to be measured according to characteristic evaluation parameters of the current sensor at the multiple measurement temperatures; A characteristic measurement result of the current sensor to be measured is determined according to the characteristic curve of the current sensor to be measured, and the characteristic measurement result is used to indicate whether the current sensor is stable in a low temperature environment.

2. The method according to claim 1, characterized in that The current sensor characteristic evaluation parameters include amplitude-frequency parameters and transmission impedance parameters. The step of obtaining the current sensor characteristic evaluation parameters of the current sensor to be measured at multiple measurement temperatures includes: A plurality of measured temperatures are obtained within the target temperature range according to the target temperature interval and the standard temperature; At the multiple measurement temperatures, the current amplitude of the signal output by the signal generator is kept constant, the frequency of the output signal is adjusted, and the voltage amplitude of the corresponding frequency signal received by the oscilloscope is recorded to obtain the amplitude-frequency parameter; At the multiple measurement temperatures, the current amplitude of the signal output by the signal generator is kept constant, and the transmission impedance parameter is obtained by obtaining the ratio of the voltage amplitude of the target frequency signal received by the oscilloscope to the current amplitude of the signal output by the signal generator when the output signal frequency is the target frequency.

3. The method according to claim 2, characterized in that The target temperature interval includes a first temperature interval having a temperature less than a first boundary temperature and not less than a second boundary temperature and a second temperature interval having a temperature less than a third boundary temperature and not less than the first boundary temperature, the target temperature interval includes a first temperature interval corresponding to the first temperature interval and a second temperature interval corresponding to the second temperature interval, the standard temperature is within the second temperature interval, and a plurality of measured temperatures are obtained within the target temperature interval according to the target temperature interval and the standard temperature, including: Obtaining a plurality of first temperature interval measurement temperatures within the first temperature interval according to the first temperature interval and the standard temperature; Determining whether there is a measured temperature in the second temperature interval among the plurality of measured temperatures in the first temperature interval; If it is detected that there is a measured temperature located in the second temperature interval among the plurality of measured temperatures in the first temperature interval, a plurality of second temperature interval measured temperatures smaller than the measured temperature located in the second temperature interval are obtained in the second temperature interval according to the second temperature interval and the measured temperature located in the second temperature interval; if it is detected that there is no measured temperature located in the second temperature interval among the plurality of measured temperatures in the first temperature interval, a plurality of second temperature interval measured temperatures are obtained in the second temperature interval according to the second temperature interval and the first boundary temperature; A plurality of measured temperatures are obtained according to the first temperature interval measured temperature and the second temperature interval measured temperature.

4. The method according to claim 2, characterized in that The step of adjusting the frequency of the output signal comprises: receiving a target signal frequency interval and a target signal frequency range from a terminal; The stepping speed and increment value of the phase accumulator in the digital frequency synthesizer are adjusted according to the target signal frequency interval to generate a plurality of output signals with different frequencies within the target signal frequency interval.

5. The method according to claim 1, characterized in that The characteristic curve includes an amplitude-frequency characteristic curve and a transmission impedance curve, and the characteristic curve of the current sensor to be measured is obtained according to the characteristic evaluation parameters of the current sensor at the multiple measurement temperatures, including: Acquire target voltage amplitude data received by the oscilloscope at different signal generator frequencies according to the characteristic evaluation parameter; Using the signal generator frequency as the horizontal axis and the voltage amplitude data received by the oscilloscope as the vertical axis, a plurality of first data points are plotted in the coordinate system according to the target voltage amplitude data received by the oscilloscope at different signal generator frequencies; Obtaining an amplitude-frequency characteristic curve of the current sensor to be measured by connecting the plurality of first data points; Acquire the transmission impedance parameters of the current sensor to be measured at different temperatures according to the characteristic evaluation parameters; Taking the temperature as the horizontal axis and the transmission impedance parameter of the current sensor to be measured as the vertical axis, plotting a plurality of second data points in the coordinate system according to the transmission impedance parameter of the current sensor to be measured at different temperatures; The transmission impedance curve of the current sensor to be measured is obtained by connecting the plurality of second data points.

6. The method according to claim 2, characterized in that The determining the characteristic measurement result of the current sensor to be measured according to the characteristic curve of the current sensor to be measured includes: Obtaining a first characteristic measurement result by comparing the amplitude deviation of the amplitude-frequency characteristic curve at different temperatures with a target amplitude deviation threshold; Obtaining a second characteristic measurement result by comparing the slope of the curve at each temperature in the transmission impedance curve with the target slope; A characteristic measurement result of the current sensor to be measured is obtained according to the first characteristic measurement result and the second characteristic measurement result.

7. The method according to claim 6, characterized in that The obtaining of the first characteristic measurement result by comparing the amplitude deviation of the amplitude-frequency characteristic curve at different temperatures with a target amplitude deviation threshold comprises: Obtaining a degree of deviation of voltage amplitude data of the amplitude-frequency characteristic curve at a first temperature and the amplitude-frequency characteristic curve at a second temperature at each signal generator frequency, wherein an interval between the first temperature and the second temperature is the target temperature interval; It is detected that the deviation degree is greater than the target amplitude deviation threshold, and it is determined that the first characteristic measurement result is that the amplitude-frequency characteristic of the current sensor to be measured is abnormal.

8. The method according to claim 6, characterized in that The obtaining of the second characteristic measurement result by comparing the curve slope at each temperature in the transmission impedance curve with the target slope includes: Obtaining the slope of the transmission impedance curve at each temperature; It is detected that the slope of the curve is greater than the target slope, and it is determined that the second characteristic measurement result is that the transmission impedance of the current sensor to be measured is abnormal.

9. The method according to claim 6, characterized in that The method further comprises: Obtaining multiple measurement temperatures according to the second temperature interval within the target temperature range, obtaining the standard deviation of the output signal of the current sensor to be measured when the output signal frequency is the target frequency at each measurement temperature among the multiple measurement temperatures, and obtaining a corresponding relationship between the temperature and the standard deviation of the output signal; According to the corresponding relationship between the temperature and the standard deviation of the output signal, it is detected that the discreteness of the output signal is greater than the target discreteness threshold, and / or the deviation of the standard deviation of the output signal at two measuring temperatures separated by the second temperature interval exceeds the target standard deviation deviation threshold, and it is determined that the characteristic measurement result of the current sensor to be measured is that the current sensor to be measured has poor stability.

10. A current sensor characteristic measuring device, characterized in that: The device comprises: An acquisition module, used for acquiring current sensor characteristic evaluation parameters of the current sensor to be measured at multiple measurement temperatures; A processing module is used to obtain a characteristic curve of the current sensor to be measured according to the characteristic evaluation parameters of the current sensor at the multiple measurement temperatures; and to determine a characteristic measurement result of the current sensor to be measured according to the characteristic curve of the current sensor to be measured, wherein the characteristic measurement result is used to indicate whether the current sensor is stable in a low temperature environment.

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