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Fault arc detection method

A fault arc and detection method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of inaccurate judgment, false alarms, noise pollution, etc., to avoid complex processes and reduce the possibility of misjudgment. Effect

Active Publication Date: 2015-04-29
SHANGHAI HIWAVE COMPOSITE MATERIALS CO LTD
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Problems solved by technology

This method separates the high-frequency signal from the low-frequency signal through the hardware circuit, which is easy to generate new noise pollution, resulting in inaccurate judgment and false alarms

Method used

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Embodiment Construction

[0018] The technical solution of the present invention is further described below. The following description is only for understanding the technical solution of the present invention, and is not used to limit the scope of the present invention. The scope of protection of the present invention is based on the claims.

[0019] Such as figure 1 As shown, it is a flow chart of a method of a preferred embodiment of the present invention: collect current signals through current sensors (such as Hall current sensors, etc.), conduct harmonic analysis on current signals, calculate high-order harmonic content, and pass the detected After the switch of the circuit is turned off, the signal is collected within a certain period of time (for example, within 100ms, other times can also be set according to the needs)), and the high-order harmonic content rate of this period of time is obtained, that is, the high-order harmonic content of the circuit is obtained. The mathematical model of the ...

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Abstract

The invention discloses a fault arc detection method. The method comprises the following steps that current signals are collected and subjected to harmonic analysis, the higher harmonic ratio is calculated, the higher harmonic ratio in a current time period is obtained by collecting signals within the time period set before and after switch-on and switch-off of a circuit, and then a time-related mathematical model of the higher harmonic ratio of the circuit is obtained; the change of the higher harmonic ratio of the circuit at the moment of being switched off is calculated and compared with the actual change of the higher harmonic ratio of the circuit; if the frequency that the actual higher harmonic ratio is higher than a theoretical higher harmonic ratio is larger than a threshold value, it is regarded that a fault arc happens. The fault arc detection method has the advantages that a unique model for the circuit is obtained by analyzing the circuit, and analysis in advance is not needed.

Description

technical field [0001] The invention relates to an arc detection technology, in particular, a fault arc detection method based on circuit current characteristics and models. Background technique [0002] Arc fault is a random physical phenomenon that can be described by mathematical statistics, also known as "gas ionization". The pressure, radiation, and arc effect generated by the fault arc may cause serious damage to the equipment. At the same time, the high-temperature and high-pressure gas will be hot due to the arc effect, which will cause a fire. Therefore, the research of fault arc, especially the research of fault arc detection method is particularly important. [0003] The electronic arc fault circuit interrupter (AFCI) currently on the market needs to store all electrical characteristics (Renesas Technology, AFCI detection principle) to determine whether it is an arc fault. Circuit load conditions vary greatly, and it is difficult to make statistics of all electr...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 陈乐生叶连慧
Owner SHANGHAI HIWAVE COMPOSITE MATERIALS CO LTD
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