Series arc fault intelligent circuit breaker

A technology of intelligent circuit breaker and series arc, which is applied in the direction of emergency protection circuit devices, instruments, measuring electricity, etc., can solve the problems that algorithms cannot be applied, achieve the effect of enhancing reliability and practicability, and improving detection accuracy

Active Publication Date: 2020-09-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, the current existing series arc fault detection schemes based on machine learning algorithms all need to use professional

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  • Series arc fault intelligent circuit breaker
  • Series arc fault intelligent circuit breaker
  • Series arc fault intelligent circuit breaker

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[0041] In order to make the above objectives, features and advantages of the present application more obvious and understandable, the specific implementation of the present application will be described in detail below in conjunction with the accompanying drawings.

[0042] The functional modules and working principles of the present invention are as follows figure 1 Shown.

[0043] The current sensor in the acquisition module M1 is installed in the main circuit and the incoming lines of the sub-circuits at all levels. A typical circuit topology and its current sensor installation position are as follows: figure 2 Shown. In the figure, B0 to B11 are all branches, among which branches B2 to B5 form subcircuit S1, branches B9 to B11 form subcircuit S3, and branches B6 to B8 and subcircuit S3 form subcircuit S2. Current sensors are installed at branches B0, B2, B6 and B9.

[0044] The filter circuit in the acquisition module M1 is an anti-aliasing filter to filter out high frequency ...

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Abstract

The invention discloses a series arc fault intelligent circuit breaker scheme design based on a machine learning algorithm. The circuit breaker is used for single-phase low-voltage power supply linesfor residents, industry and commerce. A current signal of a circuit is acquired by a sensor. Then zero-zone proportion and peak value coefficient characteristics of the signal are extracted from a time domain, inter-harmonic content characteristics of the signal are extracted from a frequency domain, and power spectrum distribution and harmonic power proportion characteristics of the signal are extracted from an energy domain; and then waveforms are classified according to a kurtosis coefficient and a specific inter-harmonic content, the extracted characteristics of the classified waveforms are calculated by adopting a corresponding intelligent algorithm, whether a series arc fault occurs in the circuit or not is determined, and a fault branch is located. The intelligent algorithm and parameters are obtained by training a machine learning algorithm with a sample and then extracting a rule between the parameters and an algorithm result, and are solidified in a microprocessor. Accordingto the scheme, the judgment accuracy of the arc fault circuit breaker is improved, fault branch positioning can be achieved, an electrical fire problem is solved, and the practical value is achieved.

Description

technical field [0001] The invention relates to a civil low-voltage switching device (hereinafter referred to as a switching device), in particular to a series arc fault circuit breaker. Background technique [0002] Arc is a gas discharge phenomenon accompanied by strong light and high heat, which can easily cause fire or even explosion under certain circumstances, seriously threatening personal safety and electrical equipment safety. When the electrical contact pair in the line connection, connector or switchgear is in poor contact, there is a high probability of inducing a discharge arcing phenomenon between the two electrodes of the contact pair, which is called a series arc fault. Low-voltage switching devices such as miniature air switches (hereinafter referred to as air switches) generally adopt the principle of inverse time current protection, and only trip when the line current meets the overload condition. However, the fault current generated by series arc faults ...

Claims

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Application Information

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IPC IPC(8): G01R31/12G06K9/62G06N3/04G06N3/08G06N20/00H02H7/26
CPCG01R31/1227G06N3/08G06N20/00H02H7/262G06N3/045G06F18/24
Inventor 江军李威文哲张潮海
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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