Method for detecting power frequency series arc failure

A series arc and fault detection technology, applied in fault location, spectrum analysis/Fourier analysis, etc., can solve problems such as fault arc not established, achieve efficient detection and ensure accuracy

Active Publication Date: 2019-03-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] At present, the research on arc fault protection technology in the field of low-voltage power distribution in my country is still blank, there is no database of arc faults i...

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  • Method for detecting power frequency series arc failure
  • Method for detecting power frequency series arc failure
  • Method for detecting power frequency series arc failure

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Embodiment Construction

[0044] The present invention is described in detail below in conjunction with accompanying drawing:

[0045] Such as figure 1 As shown, the present invention performs PCA (Principal Component Analysis) calculation on the frequency spectrum of the current signal to obtain the eigenvalue by dimensionality reduction, and simultaneously calculates the proportion of the zero zone of the waveform, and proposes a power frequency series arc fault detection method. The method includes The following steps:

[0046] Step S1, collecting current data in the circuit;

[0047] In step S1, in order to ensure the accuracy of the fast Fourier transform results in step S2, according to the Nyquist sampling theorem, the sampling frequency should be greater than or equal to twice the highest frequency, and the sampling frequency f of the sensor is s ≥1kHz.

[0048] Step S2, calculate the amplitude of each harmonic and the ratio R between the amplitude of the harmonic and the amplitude of the fu...

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Abstract

The invention discloses a method for detecting a power frequency series arch failure, and belongs to the field of circuit operation protection. By collecting current data in a circuit and conducting fast Fourier transformation, a spectrogram is obtained; then, amplitude values of a fundamental wave and all sub-harmonics are counted, and a specific value of all the sub-harmonic amplitude values andthe fundamental wave amplitude value is calculated; finally, the specific value of all the sub-harmonic amplitude values and the fundamental wave amplitude value is added into an internal matrix, then principal component analysis is conducted, and in other words, PCA calculation is conducted; an obtained principle component matrix is derived and compared with a given threshold value to determinethe type of a load and the operating state to which the load belongs; meanwhile, the length of a null zone of obtained original current data is calculated and compared with the threshold value, and when the two conditions are met at the same time, it can be determined that the electric arc failure occurs. The method can recognize different loads, is high in accuracy, can effectively protect the circuit, and ensures that a user can use electricity safely.

Description

technical field [0001] The invention relates to a power frequency series arc fault detection method, which belongs to the field of circuit operation protection. Background technique [0002] Arcing is a self-sustaining discharge phenomenon that emits intense light and heat, and an arc fault occurs when a non-human arc occurs in a live line. Arc faults include series arc faults, parallel arc faults and compound arc faults. The fault currents of parallel arc faults and compound arc faults are large and are easily disconnected by circuit breakers, but the current of series arc faults is small and difficult to be found. Once it happens, it will cause great loss of life and property. [0003] According to statistics from the Fire Department of the Ministry of Public Security, in 2016 alone, a total of 312,000 fires were reported across the country, 1,582 people were killed, 1,065 people were injured, and the direct property loss was 3.72 billion yuan. Electrical fires caused by...

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Application Information

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IPC IPC(8): G01R31/08G01R23/16
CPCG01R23/16G01R31/08
Inventor 江军文哲张潮海韩啸谭敏刚
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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