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Serial-connection fault arc detection device based on high-order cumulant identification and method thereof

A high-order cumulant and fault arc technology, applied in the direction of testing dielectric strength, can solve the problems of complex detection methods and high hardware circuit requirements, and achieve the effects of solving leakage judgment problems, avoiding complicated processes, and high sensitivity

Inactive Publication Date: 2017-05-31
FUZHOU UNIV
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  • Claims
  • Application Information

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Problems solved by technology

This method has a wide range of applications and high control precision, but the detection method is also relatively complicated and requires high hardware circuits

Method used

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  • Serial-connection fault arc detection device based on high-order cumulant identification and method thereof
  • Serial-connection fault arc detection device based on high-order cumulant identification and method thereof
  • Serial-connection fault arc detection device based on high-order cumulant identification and method thereof

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Embodiment Construction

[0040] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0041] The present invention provides a fault arc detection device based on high-order cumulant identification, such as figure 1 As shown, a power supply line including a neutral wire and a live wire is provided, and it also includes: a residual current transformer connected to the neutral wire and the live wire and used to detect the residual current signal at the incoming end of the power supply line, and a residual current transformer connected to the residual current transformer The MCU, the tripping mechanism connected to the neutral wire and the live wire respectively; the MCU is connected to the tripping mechanism through a driving circuit.

[0042] Further, in this embodiment, the live wire and the neutral wire are connected in series to the residual current transformer to detect the residual current signal at the incoming line en...

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Abstract

The invention relates to a serial-connection fault arc detection device based on high-order cumulant identification and a method thereof. The device comprises a rest current transformer, an MCU connected with the rest current transformer and a releasing mechanism connected with the null line and the live line. The MCU is connected with the releasing mechanism through a driving circuit. The method comprises steps that the MCU acquires rest current signals of an incoming line end of a circuit in real time through the rest current transformer and carries out four-order cumulant kurtosis value calculation according to preset calculation interval time; and when a kurtosis value with preset frequency value quantity is larger than the preset kurtosis value is continuously detected, the releasing circuit is driven to execute a releasing action to protect the circuit immediately. According to the invention, there is no need to judge the type of load, and a threshold value will not be changed along with the type of the load, so processing for unusual current during normal work of nonlinear load is avoided and problems of missing judgment and misjudgment of the system can be solved.

Description

technical field [0001] The invention relates to a series fault arc detection device and method based on high-order cumulant identification. Background technique [0002] In a comprehensive load circuit with multiple loads connected in series and parallel, if an arc fault occurs in a branch with a smaller rated power, the fault signal is often so small that it is submerged in the normal signal, resulting in a missed judgment by the detection device. [0003] At present, the main line current is used as the judgment object for series fault arc detection. When an arc fault occurs, the current waveform will be distorted. Based on time-domain wavelet transform and frequency-domain fast Fourier transform, the fault signal can be extracted to solve the problem of arc identification under different loads. , but there is the problem of insufficient non-linear load detection and identification capabilities. For the singular current (such as zero-off phenomenon) of the non-linear load ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/12
Inventor 鲍光海刘德军
Owner FUZHOU UNIV
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