System, method and device for measuring pulse short-circuit current parameter and storage medium

Abstract

The invention provides a system, a method and equipment for measuring pulse short-circuit current parameters and a storage medium. The measurement of surge pulse short-circuit current parameters is realized. The system comprises an adapter which converts the output end of a surge generator into an interface suitable for a coaxial cable and is connected with one end of a voltage and current conversion device through the coaxial cable, and the output end of the surge generator outputs a current signal generated by the surge generator; the short-circuiting device is connected with the other end of the voltage and current conversion device and is used for short-circuiting the output end of the surge generator so as to generate a short-circuit current signal; a current probe is fixed in the voltage and current conversion device, and the current probe is used for sensing the short-circuit current signal, converting the short-circuit current signal into a measurable voltage signal and outputting the measurable voltage signal from the output end of the current probe; the input end of the oscilloscope is connected with the output end of the current probe, and the oscilloscope is used for displaying the waveform of the voltage signal output by the output end of the current probe.

Description

Technical Field

[0001] The present application relates to the field of electronic detection, and in particular to a system, method, device and storage medium for measuring pulse short-circuit current parameters. Background Art

[0002] Surge pulse signals are mainly used in GB / T17626.5-2019 "Electromagnetic Compatibility Test and Measurement Technology Surge (Impact) Immunity Test", which is mainly used to simulate the interference of surges (impacts) generated by power system switches and lightning on electronic instruments and equipment, test the ability of electronic instruments and equipment to resist surges (impacts), and evaluate the performance of electronic instruments and equipment when they are interfered by surge pulse signals. Among them, surge pulse signals can simulate the generation of lightning transient pulse signals, such as simulating the large current pulse signal generated when direct lightning strikes external objects or circuits, or simulating indirect lightning strikes, that is, lightning strikes between clouds, in clouds, or lightning strikes on nearby objects, which will generate electromagnetic fields, induced currents generated on the inner and outer conductors of buildings, and the ground current of lightning that directly discharges to the ground nearby. The characteristics of surge pulse short-circuit pulse current are high current peak, rise time and duration of microseconds, which are more harmful to electronic equipment. Military, aerospace and aviation airborne equipment have always attached great importance to the test of surge pulse current, and surge pulse signals are widely used in electromagnetic compatibility tests.

[0003] Regarding the surge pulse short-circuit current parameters, GB / T17626.5-2019 describes that the current peak can reach 2kA, the wavefront time is 8μs, and the duration is 20μs. The current pulse waveform is as follows Figure 1 At present, the measurement method for surge pulse short-circuit current is the short-circuit line time domain measurement method, and its measurement principle block diagram is as follows: Figure 2 As shown in the figure, the direct measurement is performed by using the short-circuit time domain measurement method. When measuring, the output end of the surge generator is short-circuited with a short-circuit line, and then the short-circuit line passes through the sensing end of the current probe. Finally, an oscilloscope is used to measure the surge pulse short-circuit current parameters, including current peak value, wavefront time and duration. The existing method for measuring surge pulse short-circuit current parameters mainly uses the short-circuit line method.

[0004] However, in the actual measurement process, the short-circuit current is affected by the physical dimensions of the short-circuit line, such as the length and inner diameter of the short-circuit line. The circuit distribution parameters of the parasitic capacitance and inductance generated by it will affect the accurate measurement of the surge pulse short-circuit current parameters. In particular, the impedance of the short-circuit line and the unstable position of the current probe will directly affect the accuracy of the current peak measurement value.

[0005] Therefore, how to design a system for measuring pulse short-circuit current parameters to achieve the measurement of surge pulse short-circuit current parameters and better avoid factors such as the impedance of the short-circuit line and the inability to fix the measurement position of the current probe is a problem that needs to be solved at present. Summary of the invention

[0006] The embodiments of the present application provide a system, method, device and storage medium for measuring pulse short-circuit current parameters, which can realize the measurement of surge pulse short-circuit current parameters and can better avoid factors such as the impedance of the short-circuit line and the inability to fix the measurement position of the current probe.

[0007] In order to achieve the above objectives, this application adopts the following technical solutions:

[0008] In a first aspect, the present application provides a system for measuring pulse short-circuit current parameters, the system comprising:

[0009] The adapter converts the output end of the surge generator into an interface suitable for the coaxial cable and is connected to one end of the voltage-current conversion device through the coaxial cable, wherein the output end of the surge generator outputs the current signal generated by the surge generator;

[0010] A short circuit device is connected to the other end of the voltage-current conversion device and is used to short-circuit the output end of the surge generator to generate a short-circuit current signal;

[0011] A voltage-current conversion device, in which a current probe is fixedly installed, the current probe is used to sense the short-circuit current signal, and convert the short-circuit current signal into a measurable voltage signal, and output it from the output end of the current probe;

[0012] An oscilloscope, the input end of the oscilloscope is connected to the output end of the current probe, and is used to display the waveform of the voltage signal output by the output end of the current probe.

[0013] In a possible design scheme, the system of the first aspect also includes that the coaxial cable is made of a low-loss material and the length of the coaxial cable is as short as possible to reduce attenuation and delay during signal transmission.

[0014] In a possible design scheme, the system of the first aspect also includes that the oscilloscope is a digital oscilloscope having high-speed sampling and waveform storage functions.

[0015] A possible design scheme, the system of the first aspect also includes that the voltage-current conversion device adopts a coaxial structure metal material, which has a shielding effect and is used to reduce external electromagnetic interference.

[0016] In a possible design scheme, the system of the first aspect further includes that the oscilloscope is connected to the computer via an interface, and the waveform displayed on the oscilloscope is analyzed by using software on the computer.

[0017] In a second aspect, the present application provides a method for measuring pulse short-circuit current parameters, the method comprising:

[0018] Connecting one end of the voltage-current conversion device to the output end of the surge generator through an adapter and a coaxial cable, wherein the output end of the surge generator outputs a current signal generated by the surge generator;

[0019] The output end of the surge generator is short-circuited by a short-circuit device connected to the other end of the voltage-current conversion device to generate a short-circuit current signal;

[0020] The short-circuit current signal is converted into a voltage signal by a current probe fixed in the voltage-current conversion device;

[0021] Use an oscilloscope to display the waveform of the voltage signal and read the voltage peak value, rise time and duration of the voltage signal;

[0022] The parameters of the current signal after the short circuit are calculated based on the voltage peak value, rise time and duration of the voltage signal.

[0023] A possible design scheme, the method of the second aspect also includes, before connecting one end of the voltage-current conversion device to the output end of the surge generator through an adapter and a coaxial cable, it also includes: turning on the surge generator and the oscilloscope for preheating so that the surge generator and the oscilloscope reach a stable working state.

[0024] In a possible design scheme, the method of the second aspect further includes calculating parameters of the current signal after the short circuit according to the voltage peak value, rise time and duration of the voltage signal, including:

[0025] Calculate the current peak value of the short-circuit current signal according to the voltage peak value of the voltage signal and the conversion coefficient of the current probe;

[0026] Calculate the rise time of the short-circuit current signal based on the rise time of the waveform;

[0027] According to the duration of the waveform, calculate the duration of the short-circuit current signal.

[0028] In a third aspect, an electronic device is provided, comprising: a processor, and a memory for storing a program, wherein the program comprises instructions, which when executed by the processor, cause the processor to execute the method for measuring pulse short-circuit current parameters as described in the second aspect.

[0029] In a fourth aspect, a computer-readable storage medium is provided, which includes a computer program or instruction stored therein. When the computer program or instruction is executed, the method for measuring pulse short-circuit current parameters described in the second aspect is executed.

[0030] In the embodiment of the present application, the measurement of the surge pulse short-circuit current parameters is achieved through a test system composed of a voltage-current conversion device, a coaxial cable, an adapter, a current probe, and an oscilloscope, and factors such as the impedance of the short-circuit line and the inability to fix the measurement position of the current probe can be avoided. Among them, the coaxial cable and the adapter avoid the circuit distribution parameters of the parasitic capacitance and inductance generated by the different physical dimensions such as the length and inner diameter of the short-circuit line, which affect the accurate measurement of the pulse short-circuit current parameters; the position of the circuit probe is fixed in the voltage-current conversion device, which avoids the influence of the current peak measurement value due to the non-fixed position of the current probe.

[0031] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 It is a current pulse waveform diagram measured in the prior art;

[0034] Figure 2 A schematic diagram of a system for short-line measurement in the prior art;

[0035] Figure 3 A connection diagram of a system for measuring pulse short-circuit current parameters provided in an embodiment of the present application;

[0036] Figure 4 A schematic flow chart of a method for measuring pulse short-circuit current parameters provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. At the same time, in the description of the embodiments of the present application, the terms "first", "second", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0038] Figure 3 A connection diagram of a system for measuring pulse short-circuit current parameters provided in an embodiment of the present application. Based on this system, the measurement of surge pulse short-circuit current parameters can be achieved, and factors such as the impedance of the short-circuit line and the inability to fix the measurement position of the current probe can be avoided.

[0039] The system for measuring pulse short-circuit current parameters specifically includes: an adapter, a short-circuit device, a voltage-current conversion device and an oscilloscope, as shown below.

[0040] The adapter converts the output end of the surge generator into an interface suitable for the coaxial cable and is connected to one end of the voltage-current conversion device through the coaxial cable, wherein the output end of the surge generator outputs the current signal generated by the surge generator;

[0041] A short circuit device is connected to the other end of the voltage-current conversion device and is used to short-circuit the output end of the surge generator to generate a short-circuit current signal;

[0042] A voltage-current conversion device, in which a current probe is fixedly installed, the current probe is used to sense the short-circuit current signal, and convert the short-circuit current signal into a measurable voltage signal, and output it from the output end of the current probe;

[0043] An oscilloscope, the input end of the oscilloscope is connected to the output end of the current probe, and is used to display the waveform of the voltage signal output by the output end of the current probe.

[0044] Among them, the coaxial cable is made of low-loss materials, and the length of the coaxial cable is as short as possible to reduce the attenuation and delay during signal transmission. It can be understood that the coaxial cable is made of low-loss materials, such as low-loss polyethylene, fluorinated polymers, etc., which have lower dielectric constants and smaller electrical losses, which can effectively reduce the attenuation and delay during signal transmission.

[0045] Optionally, the voltage-current conversion device uses a coaxial structure metal material with a shielding effect to reduce external electromagnetic interference, thereby ensuring measurement accuracy and system stability. Since electromagnetic interference may come from electronic devices, wireless signals or power supply noise in the surrounding environment, these interference signals may affect the normal operation of the measuring device and result in inaccurate voltage or current measurement data.

[0046] Among them, the oscilloscope is a digital oscilloscope with high-speed sampling and waveform storage functions.

[0047] Optionally, the oscilloscope is also connected to a computer via an interface, and the waveform displayed on the oscilloscope is analyzed by using software on the computer. It is understood that the oscilloscope can also be connected to a computer via an interface such as USB, LAN, GPIB, etc., and special software can be used for data recording, waveform analysis and remote control to assist in the subsequent reading and processing of data on the oscilloscope waveform.

[0048] In the embodiment of the present application, the measurement of the surge pulse short-circuit current parameters is achieved through a test system composed of a voltage-current conversion device, a short circuit, a coaxial cable, an adapter, a current probe, and an oscilloscope, and factors such as the impedance of the short circuit line and the inability to fix the measurement position of the current probe can be avoided. Among them, the coaxial cable and the adapter avoid the circuit distribution parameters of the parasitic capacitance and inductance generated by the different physical dimensions such as the length and inner diameter of the short circuit line, which affect the accurate measurement of the pulse short-circuit current parameters; the position of the circuit probe is fixed in the voltage-current conversion device, which avoids the influence of the current peak measurement value due to the non-fixed position of the current probe.

[0049] Combination of the above Figure 3 The system for measuring pulse short-circuit current parameters provided by the embodiment of the present application is described in detail. Figure 4 The method for measuring pulse short-circuit current parameters provided in an embodiment of the present application is described in detail. The method is executed by the above-mentioned system for measuring pulse short-circuit current parameters.

[0050] The process of the method for measuring pulse short-circuit current parameters is as follows:

[0051] Step S101, connecting one end of a voltage-current conversion device to an output end of a surge generator through an adapter and a coaxial cable, wherein the output end of the surge generator outputs a current signal generated by the surge generator.

[0052] Step S102, short-circuiting the output end of the surge generator through a short-circuit device connected to the other end of the voltage-current conversion device to generate a short-circuit current signal;

[0053] Step S103, converting the short-circuit current signal into a voltage signal through a current probe fixed in the voltage-to-current conversion device.

[0054] Step S104: Use an oscilloscope to display the waveform of the voltage signal, and read the voltage peak value, rise time and duration of the voltage signal.

[0055] The voltage peak value, rise time and duration of the voltage signal are respectively represented by U and T. r , T W Indicates that the corresponding units are volts, microseconds, and microseconds respectively.

[0056] Step S105, calculating the parameters of the current signal after the short circuit according to the voltage peak value, rise time and duration of the voltage signal.

[0057] According to the voltage peak value of the voltage signal and the conversion coefficient of the current probe, the current peak value of the current signal after short circuit is calculated. The current peak value of the current signal after short circuit is obtained; where I represents the short-circuit current peak value, in amperes; U represents the voltage peak value of the voltage signal read on the oscilloscope, in volts; and k represents the current probe conversion coefficient.

[0058] The above current probe conversion factor (or sensitivity) is predetermined by the manufacturer based on the design and characteristics of the probe and is precisely calibrated during the production process, or measured in advance by the laboratory through experiments. The conversion factor represents the output voltage (usually millivolts or volts) corresponding to each unit current (such as 1 ampere).

[0059] According to the rise time of the voltage signal, calculate the rise time of the current signal after the short circuit. f =1.25×T r , and the rise time of the current signal after short circuit is obtained; where T f Expressed as short-circuit current rise time, in microseconds; T r It is expressed as the time interval required for the voltage signal read on the oscilloscope to rise from 10% to 90%, and the unit is microseconds.

[0060] According to the duration of the voltage signal, calculate the duration of the current signal after the short circuit. By calculating the formula T d =1.18×T W , and the duration of the current signal after short circuit is obtained; where T d Expressed as short-circuit current duration, in microseconds; T w It is expressed as the time interval between the point where the voltage signal read on the oscilloscope rises to 50% of the peak value and drops to 50% of the peak value, in microseconds.

[0061] It should be noted that, before step S101, the process further includes: starting up and preheating the surge generator and the oscilloscope, so that the surge generator and the oscilloscope reach a stable working state.

[0062] In addition, as for the specific implementation of the above method, since it is basically similar to the system implementation, the description is relatively simple, and the relevant parts can be referred to the partial description of the system implementation.

[0063] The above combination describes the method for measuring pulse short-circuit current parameters implemented by executing the system for measuring pulse short-circuit current parameters provided by the embodiment of the present application. The following describes the specific application scenarios of the method for measuring pulse short-circuit current parameters provided by the present application.

[0064] According to the measurement method of the present application, the pulse short-circuit current of a surge generator of model UCS500N7 is measured, wherein the oscilloscope, current probe, voltage-current conversion device and short-circuit device are used according to the above Figure 3 The connections shown constitute a system for measuring pulse short-circuit current parameters. Among them, the current probe model is 411, and the oscilloscope model is DPO4104B, which is used to display the waveform of the voltage signal output from the output end of the current probe.

[0065] In the example of this application, the surge pulse signal output voltage is taken as 500V and 1000V as an example, and the required measured pulse short-circuit current parameter indicators are: 500v corresponds to a current peak of 250A, with a maximum tolerance of ±10%; wavefront time: 8μs, with a maximum tolerance of ±20%; duration: 20μs, with a maximum tolerance of ±20%;

[0066] The measurement is performed according to the above steps S101-S105, and the final UCS500N7 short-circuit current pulse parameter measurement data is shown in Table 1.

[0067]

[0068] Table 1

[0069] It can be seen from the data in Table 1 that, under different surge pulse output voltages, the measured values ​​of the surge pulse short-circuit current parameters meet the requirements of the maximum allowable error in the standard, verifying the accuracy and rationality of the measurement method of the present invention.

[0070] Another aspect of the embodiments of the present invention further provides an electronic device for implementing the above-mentioned method for measuring pulse short-circuit current parameters, and the electronic device is not limited to being a terminal device or a server in the system. The electronic device is not limited to including a memory and a processor, the memory stores a computer program, and the processor is configured to execute the steps in any of the above-mentioned method embodiments through the computer program.

[0071] Another aspect of the embodiments of the present invention provides a computer program product or a 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 the method provided in various optional embodiments of the method for measuring pulse short-circuit current parameters. The computer program is configured to execute the steps of any of the above method embodiments when running.

[0072] In addition, each embodiment in the present application is described in a progressive manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences between it and other embodiments.

[0073] The above describes specific embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the specific order or continuous order shown in the process depicted in the drawings is not necessarily required to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0074] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A system for measuring pulse short-circuit current parameters, characterized in that: The system comprises: An adapter converts the output end of the surge generator into an interface suitable for a coaxial cable and is connected to one end of a voltage-current conversion device via the coaxial cable, wherein the output end of the surge generator outputs a current signal generated by the surge generator; A short circuit device, the short circuit device being connected to the other end of the voltage-current conversion device and being used for short-circuiting the output end of the surge generator to generate a short-circuit current signal; A voltage-to-current conversion device, wherein a current probe is fixedly installed in the voltage-to-current conversion device, and the current probe is used to sense the short-circuit current signal and convert the short-circuit current signal into a measurable voltage signal and output it from an output end of the current probe; An oscilloscope, the input end of which is connected to the output end of the current probe, and is used to display the waveform of the voltage signal output by the output end of the current probe.

2. The system for measuring pulse short-circuit current parameters according to claim 1, characterized in that: The coaxial cable is made of low-loss material, and the length of the coaxial cable is as short as possible to reduce attenuation and delay during signal transmission.

3. The system for measuring pulse short-circuit current parameters according to claim 1, characterized in that: The oscilloscope is a digital oscilloscope with high-speed sampling and waveform storage functions.

4. The system for measuring pulse short-circuit current parameters according to claim 1, characterized in that: The voltage-current conversion device adopts a coaxial structure metal material, has a shielding effect, and is used to reduce external electromagnetic interference.

5. The system for measuring pulse short-circuit current parameters according to claim 1, characterized in that: The oscilloscope is also connected to a computer via an interface, and the waveform displayed on the oscilloscope is analyzed by using software on the computer.

6. A method for measuring pulse short-circuit current parameters, characterized in that: The method comprises: Connecting one end of the voltage-current conversion device to the output end of the surge generator through an adapter and a coaxial cable, wherein the output end of the surge generator outputs the current signal generated by the surge generator; The output end of the surge generator is short-circuited by a short-circuit device connected to the other end of the voltage-current conversion device to generate a short-circuit current signal; The short-circuit current signal is converted into a voltage signal by a current probe fixed in the voltage-current conversion device; Using an oscilloscope to display the waveform of the voltage signal, and reading the voltage peak value, rise time and duration of the voltage signal; Parameters of the short-circuited current signal are calculated according to the voltage peak value, rise time and duration of the voltage signal.

7. The method for measuring pulse short-circuit current parameters according to claim 6, characterized in that: Before connecting one end of the voltage-current conversion device to the output end of the surge generator through the adapter and the coaxial cable, the method further includes: starting up and preheating the surge generator and the oscilloscope so that the surge generator and the oscilloscope reach a stable working state.

8. The method for measuring pulse short-circuit current parameters according to claim 6, characterized in that: The step of calculating the parameters of the short-circuited current signal according to the voltage peak value, rise time and duration of the voltage signal comprises: Calculating the current peak value of the short-circuit current signal according to the voltage peak value of the voltage signal and the conversion coefficient of the current probe; Calculating the rise time of the short-circuit current signal according to the rise time of the waveform; The duration of the short-circuit current signal is calculated according to the duration of the waveform.

9. An electronic device, characterized in that: The electronic device comprises: a processor, and a memory storing a program, wherein the program comprises instructions, which, when executed by the processor, cause the processor to perform the method according to any one of claims 6 to 8.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a computer program or instruction stored therein, and when the computer program or instruction is executed, the method according to any one of claims 6 to 8 is performed.

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