Series connection fault arc pre-warning system and detection method thereof

Abstract

The invention provides a series connection fault arc pre-warning system. The series connection fault arc pre-warning system comprises a power circuit, a current transformer, a current sensing circuit, a signal processing circuit, a voltage zero balancing comparison circuit, a microprocessor and a fault output circuit. The current transformer, the current sensing circuit, the signal processing circuit and the microprocessor are successively connected. The voltage zero balancing comparison circuit and the fault output circuit are respectively connected with the microprocessor. The current transformer collects a current signal in a power network to transform the current signal into a voltage signal through the current sensing circuit to input to the microprocessor through the signal processing circuit, and the voltage zero balancing comparison circuit outputs a voltage zero balancing pulse signal to the microprocessor. The invention further provides a series connection arc fault detection method. The series connection fault arc pre-warning system and the series connection arc fault detection method have the advantages that due to the fact that a signal is directly processed in time domain after sampling, the complicated Fourier transform is saved, the fault arc and normal wave form can be distinguished accurately, and the computation time is saved. The series connection fault arc detection can be achieved by the more economical microprocessor. The detection is reliable and effective, and effective and timely pre-warning information can be supplied to workers.

Description

technical field [0001] The invention relates to detection technology, in particular to a series fault arc early warning system and a detection method thereof. Background technique [0002] According to the statistics of "China Fire Protection Yearbook" in 2005, a total of 142,568 fires occurred in 2004, of which 2,948 were electrical fires, accounting for 20.7% of the total number of fires. The electrical fire caused 398 deaths, 427 injuries, and a direct economic loss of 4.8 billion yuan, accounting for 42% of the total fire losses under investigation. Among the extraordinarily large fires, there were 10 electrical fires, accounting for 37% of the total 27, and the direct economic loss reached 2.1 billion yuan, accounting for 74%. Electrical fires have brought serious threats to people's lives and national property. Among the many causes of electrical fires, arc fault is one of the most important reasons. [0003] The occurrence of fault arc can be generally divided into...

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Problems solved by technology

However, after sampling in this patent, it is necessary to perform Fourier transform on the sampled signal, which requires a long

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