Arc fault protection device

Abstract

The invention relates to the technical field of electrical equipment and household appliance protection and discloses an arc fault protection device. The device comprises a central processing unit, an output drive circuit and an alarm light. The input end of the central processing unit is connected with output ends of a voltage filtering processor, a first current filtering processor and a second current filtering processor respectively. According to the device, the voltage in a load circuit is acquired through a voltage transformer, the serial current in the load circuit is acquired through a first current transformer, the parallel current in the load circuit is acquired through a second current transformer, and accordingly, the problems of the damage of loads due to the failure of protection caused by distance running of a breaker or the reduction of power reliability caused by the maloperation of conventional arc fault protection breakers are solved by combining with the voltage waveform of arc faults and integrating fault protection with leakage protection on the basis of the arc fault current waveform. The device has the advantages of being complete in protection items and accurate and reliable in breaker action.

Description

technical field [0001] The invention relates to the technical field of protection of electrical equipment and household appliances, in particular to an arc fault protection device based on the current waveform of an arc fault in a load circuit and taking into account the analysis and processing of the voltage waveform of the arc fault. Background technique [0002] With the continuous development of science and technology, the degree of electrification of society is getting higher and higher, electrical equipment and household appliances have increased sharply, and electrical fire accidents have also increased sharply. In 2010, fires caused by electrical causes such as wire short circuit, overload and electrical equipment failure accounted for 30.7% of the total number of fires in the country. Among the 69 major fire accidents, 24 were caused by electrical causes. In general residential buildings, due to the long-term operation of electrical lines and equipment lines in the ...

AI Technical Summary

Problems solved by technology

In general residential buildings, due to the long-term operation of electrical lines and equipment lines in the state of overload or poor electrical connection, the insulation layer of the power line will age faster, the insulation effect will be reduced, or the insulation layer will be damaged, which will easily lead to arcing. failure

Commonly used arc fault protection equipment is only based on the analysis and processing of the current waveform in the load circuit, which cannot fully reflect the real situation of the arc fault, which may easily lead to malfunction or refusal of the circuit breaker, and fire accidents often

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