Method for detecting power frequency series arc failure

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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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 in my country, and the market production of AFCI (Arc Fault Circuit Interrupter) is still in its infancy. Low-voltage series fault arc detection technology has great application prospects

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