DC ARC FAULT DETECTOR FOR DC DISTRIBUTION SYSTEM AND DC ARC FAULT DETECTING METHOD

摘要

The present invention provides a DC arc fault detector. The DC arc fault detector includes a first current sensing part sensing the instantaneous value of a distribution current flowing through a DC distribution and outputting a first sensing value, a second current sensing part sensing a first frequency band component with respect to a distribution current and outputting a second sensing value, a Fourier transform part for Fourier-transforming the second sensing value and dividing the transformed data into N (N is a natural number) number of sub bands to generate N number of band data, an arc detection part for outputting an arc detection signal when at least one band data among N band data exceeds a threshold value corresponding to each band or corresponds to a threshold value or more, a malfunction prevention part that outputs a malfunction prevention signal when the characteristic of the first sensing value corresponds to a predetermined characteristic, and an arc generation determining part for determining that an arc is generated in the DC distribution when an arc generation signal is received and the malfunction prevention signal is not received. So, DC arc generated in a DC distribution system can be detected.;COPYRIGHT KIPO 2017