Fault arc protection electric appliance characteristic test method

Abstract

The invention provides a fault arc protection electric appliance characteristic test method, which is used for testing an AFDD (Avionics Frequency Division Duplex) line bearing a fault arc protection function, and comprises the AFDD line coupled by a high-frequency magnetic ring and a high-frequency signal generator, an AFDD circuit penetrates through the circle center of the high-frequency magnetic ring, the signal output end of the high-frequency signal generator is connected with a coil surrounding the high-frequency magnetic ring, and after a high-frequency signal output by the high-frequency signal generator is injected into the high-frequency magnetic ring, an electric arc environment is simulated by an electromagnetic induction effect to test the AFDD circuit; according to the invention, a test circuit is established by using power electronic devices, fault arc current characteristics appearing in a line are simulated, rapid test of the AFDD is realized, and wide market space is provided for research and development of the AFDD and research of a portable AFDD test device.

Description

technical field [0001] The invention relates to the technical field of arc fault protection, in particular to a method for testing the characteristics of electric appliances for fault arc protection. Background technique [0002] According to the statistics of the Fire Bureau of the Ministry of Public Security, the main causes of electrical fires are arc fault, overcurrent, leakage and short-circuit faults, etc. At present, there are mature electrical protection devices on the market that can effectively detect overcurrent, leakage and short-circuit faults and make corresponding protection strategies, but these products cannot detect arc faults. In order to make up for the "loopholes" in electrical fire protection and strengthen arc fault protection, many scholars at home and abroad have studied arc fault detection and arc fault protection devices (AFDD). Arc fault protection appliance is a new type of circuit protection device, which reduces the impact of arc fault by disc...

AI Technical Summary

Problems solved by technology

Although this method is simple to operate, because the current flowing through the phase line and the center line of the AFDD is not equal, the test effect will be greatly reduced when the AFDD under test has a residual current protection function

[0006] In addition, the method of outputting the fault arc current waveform by the arbitrary waveform generator and the power amplifier uses the arbitrary waveform generator to output a typical fault arc current signal, and the precision power amplifier outputs the current waveform to perform performance tests on AFDD, but due to the power amplifier There is a contradiction between high-frequency response characteristics and high gain, and the arc current output effect is not good in the high-frequency range of the arc, and the high-precision signal generator and high-power power amplifier are expensive, which is not suitable for production line testing of products

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