A fault arc simulation signal generating device based on multi-load virtual load

Abstract

The present invention provides a fault arc simulation signal generating device based on multi-load virtual loads, comprising: an arc signal generating device for generating different types of fault arc signals; an AD module for collecting the fault arc signals generated by the arc signal generator and converting them into digital fault arc signals for adjustment by digital simulation equipment; a digital simulation equipment for adjusting the parameters of the collected actual fault arc signals according to the needs of users and outputting the required simulated fault arc signals; and a DA module for outputting the simulated fault arc signals of the digital simulation equipment to users to effectively detect and verify the fault arc detector. The present invention can not only more conveniently and effectively simulate load types such as resistive, capacitive, and inductive, but also simulate fault arc signals of different branches and different distances, and can directly and quickly verify the functions of the fault arc detection device according to the needs of users.

Description

Technical Field

[0001] The present invention relates to the technical field of alternating current fault arc detection, and particularly relates to a fault arc simulation signal generating device based on multi-load virtual loads. Background Art

[0002] Fault arcs have characteristics such as small fault current, short duration, and strong concealment. Moreover, fault arcs are hidden in the circuit and invisible. If early fault arcs in the power consumption scenario are not diagnosed and warned in advance, the consequences will be unthinkable. To diagnose and warn in advance the fault arcs caused by long-term aging, damage, poor contact, etc. in the circuit, first of all, in the experimental scenario, it is necessary to develop a fault arc generating device according to the characteristics of fault arcs in order to provide a standard for the performance evaluation of the later-developed fault arc detection device.

[0003] In the invention patent with the announcement number CN 103728509 B and the invention name "A Fault Arc Signal Simulation Generating Device" announced on May 25, 2016, a fault arc signal simulation generating device is disclosed. The generating device mainly includes a fault arc signal acquisition device, a digitizing device, and a central processing and control unit. The device digitizes various collected fault arc signals through the fault arc signal acquisition device and stores them in the fault arc sample memory and the shielded load sample memory. When a certain type of fault arc signal is required to be output, the corresponding sample is taken out from the memory. To a certain extent, the device solves the simulation of fault arc signals and simplifies the fault arc generating device, but there are still certain defects. Fault arcs are random, and each generated arc is different, and it cannot well simulate the arc signals of different branches and long distances. We know that arc signals in the circuit will cause a certain degree of attenuation with the increase in the number of branches, the increase in propagation distance, and interference such as load noise, and such a phenomenon is unavoidable in real life. Moreover, the current digital simulation device cannot simulate the fault arc signals of branches and long distances, which is too limited. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, a fault arc simulation signal generating device based on multi-load virtual loads is provided, which can not only simulate and output various resistive, capacitive, inductive and other loads, but also simulate the arc signals of branches, trunks and long distances to meet the effective detection and verification of a large number of fault arc sample data by various fault arc detectors.

[0005] The technical solution adopted by the present invention is as follows: A fault arc simulation signal generating device based on multi-load virtual loads includes:

[0006] An arc signal generating device for generating different types of fault arc signals;

[0007] An AD module, which is used to collect the fault arc signals generated by the arc signal generator and convert them into digital fault arc signals for the digital-to-analog device to adjust;

[0008] A digital-to-analog device, which adjusts the parameters of the collected actual fault arc signals according to the user's needs and outputs the required analog fault arc signals;

[0009] A DA module, which is used to output the analog fault arc signals of the digital-to-analog device to the user to effectively detect and verify the fault arc detector;

[0010] Among them, different types of loads are built in the arc signal generator, and different types of fault arc signals can be generated by selecting different loads to connect.

[0011] Furthermore, the arc signal generator includes an arc generator, an N-to-1 switch, a multi-load device box and an AC power supply; N different types of loads are arranged in the multi-load device box, and the arc generator selects the loads in the multi-load device box through the N-to-1 switch to connect to the AC power supply to generate different fault arcs, and finally they are collected and converted by the AD module and output.

[0012] Furthermore, the digital-to-analog device outputs the arc signals after attenuation at a specific branch and a specific position of a certain circuit by setting the number of branches, the branch position and the noise.

[0013] Furthermore, the specific method for adjusting the parameters of the digital-to-analog device is as follows:

[0014] r = s * h + n

[0015] Among them, r is the output analog fault arc signal, s is the input actual fault arc signal, h is the attenuation factor, which is determined by the number of branches and the branch position, and n is the noise.

[0016] Furthermore, the digital-to-analog device is implemented with an embedded chip of the FPGA ZYNQ7020 series as the core.

[0017] Furthermore, the loads in the multi-load device box are all simulated and implemented by equivalent circuits built with components.

[0018] Compared with the prior art, the beneficial effects of adopting the above technical solutions are as follows: The present invention can not only more conveniently and effectively simulate load types such as resistive, capacitive, and inductive, but also simulate the fault arc signals of different branches and different distances, and can directly and quickly verify the functions of the fault arc detection device according to the user's needs. Description of the Drawings

[0019] Figure 1Schematic diagram of the fault arc simulation signal generating device proposed by the present invention.

[0020] Figure 2 Schematic diagram of the arc signal generating device in an embodiment of the present invention. Detailed implementation manners

[0021] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar modules or modules with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as a limitation of the present application. On the contrary, the embodiments of the present application include all changes, modifications and equivalents falling within the spirit and connotation of the appended claims.

[0022] In the new power system, more and more detection devices for fault arcs have been developed. For developers and users, it is particularly important to quickly and effectively verify the detection performance of the device. At present, the digital simulation fault arc signal generating device has solved the simulation of fault arc signals to a certain extent and simplified the fault arc generating device, but there are still certain defects. Fault arcs are random, and each generated arc is different, and it is not possible to well simulate the arc signals of different branches and long distances. The arc signal in the circuit will attenuate to a certain extent with the increase in the number of branches, the increase in the propagation distance, and interference such as load noise, and such a phenomenon is unavoidable in real life. At present, the digital simulation device cannot simulate the fault arc signals of branches and long distances, which is too limited.

[0023] In order to more conveniently and effectively verify the detection function of the fault arc detection device, this embodiment proposes an AC fault arc simulation signal generating device that can simulate different types of fault arc signals as needed. The specific solution is as follows;

[0024] As Figure 1 shown, a fault arc simulation signal generating device based on a multi-load virtual load includes:

[0025] An arc signal generating device for generating different types of fault arc signals;

[0026] An AD module for collecting the fault arc signals generated by the arc signal generator and converting them into digital fault arc signals for adjustment by digital simulation equipment;

[0027] A digital simulation device for adjusting the parameters of the collected actual fault arc signals according to the user's needs and outputting the required simulated fault arc signals;

[0028] The DA module is used to output the analog fault arc signal of the digital-analog device to the user to effectively detect and verify the fault arc detector.

[0029] Among them, different types of loads are built into the arc signal generating device, and different types of fault arc signals can be generated by selecting different loads to be connected.

[0030] When the user needs the fault arc signal of the load in a specific scenario, connect the load to the arc signal generating device, and then edit and test parameters such as the distance, number of branches, branch position, main circuit position, and background noise through the digital-analog device to output the required fault arc current and voltage signals.

[0031] Specifically, as Figure 2 shown, the arc signal generating device retains the arc generator, that is, retains the randomness of arc generation, and overcomes the limitation that different arc sizes generate different arc signals. The fault arc signals of different resistive, capacitive, inductive, switch-type, motor-type, different branches, and different distances are collected by the arc signal generating device.

[0032] Among them, the arc signal generating device includes an arc generator, a 1-of-N switch, a multi-load device box, and an AC power supply; N different types of loads are arranged in the multi-load device box, and the arc generator selects the load in the multi-load device box to be connected to the AC power supply through the 1-of-N switch to generate different fault arcs, and finally is collected and converted by the AD module and output.

[0033] In a preferred embodiment, the loads in the multi-load device box are all simulated by equivalent circuits built with components.

[0034] In this embodiment, due to the phenomena of noise interference and attenuation that will occur during the online propagation of the arc signal, the digital-analog device outputs the arc signal after attenuation at a specific branch and a specific position of a certain circuit by setting the number of branches, branch position, and noise. Preferably, the digital-analog device is composed of an embedded chip of the FPGA ZYNQ7020 series as the core.

[0035] The digital-analog device performs a series of logical calculations on the actually collected arc signal according to the user's needs, specifically including:

[0036] r = s * h + n

[0037] Among them, r is the output analog fault arc signal, s is the input actual fault arc signal, h is the attenuation factor, which is determined by the number of branches and branch position, and n is the noise.

[0038] That is, the digital-analog device synthesizes the fault arc simulation signal from the arc signal, attenuation factor, and noise parameter input by the arc signal generating device, and finally outputs it, meeting the fault arc simulation signals of various loads with different branches and different distances in the power distribution scenarios required by users.

[0039] The device proposed by the present invention can simulate the power line network between the arc generation position and the fault arc detector. That is, it can simulate the influence factors such as external noise interference and attenuation of the arc in the line, can simulate the arc signals of load types with different branches and different distances, and can directly verify the functions of the fault arc detection device according to the needs of users.

[0040] It should be noted that in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "set" and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations; the accompanying drawings in the embodiments are used to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0041] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A fault arc simulation signal generating device based on multi-load virtual load, characterized in that Including: An arc signal generating device for generating different types of fault arc signals; An AD module for collecting the fault arc signals generated by the arc signal generation and converting them into digital fault arc signals for the adjustment of digital simulation devices; A digital simulation device for adjusting the parameters of the collected actual fault arc signals according to user requirements and outputting the required simulated fault arc signals; A DA module for outputting the simulated fault arc signals of the digital simulation device to the user to effectively detect and verify the fault arc detector; Among them, different types of loads are built into the arc signal generating device, and different types of fault arc signals can be generated by selecting different loads to be connected; The digital simulation device outputs the arc signals attenuated by the corresponding branches and positions by setting the number of branches, branch positions, and noise; The specific method for adjusting the parameters of the digital simulation device is: r = s * h + n Where r is the output simulated fault arc signal, s is the input actual fault arc signal, h is the attenuation factor determined by the number of branches and branch positions, and n is the noise.

2. The fault arc simulation signal generating device based on multi-load virtual load according to claim 1, characterized in that The arc signal generating device includes an arc generator, a 1-of-N switch, a multi-load device box, and an AC power supply; N different types of loads are arranged in the multi-load device box. The arc generator selects the loads in the multi-load device box through the 1-of-N switch to be connected to the AC power supply to generate different fault arcs, and finally they are collected and converted by the AD module for output.

3. The fault arc simulation signal generating device based on multi-load virtual load according to claim 1, characterized in that, The digital simulation device is implemented with an embedded chip of the FPGA ZYNQ7020 series as the core.

4. The fault arc simulation signal generating device based on multi-load virtual load according to claim 2, characterized in that, The loads in the multi-load device box are all simulated by equivalent circuits built with components.

Images