MEHTHOD OF ARC DETECTION BASED ON WAVELET

摘要

PURPOSE: A wavelet-based arc determining method is provided to accurately determine electric signals causing fire because arc is determined by analyzing all the load current signals. CONSTITUTION: A wavelet-based arc determining method is as follows: a step of detecting electric signals of an electric panel; a step of primarily determining arc by analyzing the detected electric signals in a time section; a step of secondarily determining the arc by analyzing the electric signals in a frequency section; a step of tertiarily determining the arc by wavelet-transforming and analyzing the detected electric signals; and a step of finally determining the electric signals to the arc when all the electric signals detected in above steps is determined as the arc. The primary determining step determines the arc using a current wave type distortion rate. The secondary determining step determines the arc according to the increased rate of odd harmonics and high frequency over 1kHz. The tertiary determining step determines the arc when the electric signals are over a preset threshold value. [Reference numerals] (AA) Start; (BB) A/D input; (CC) Current wave type distortion > set value; (DD,EE) High frequency > set value; (FF) Generate an auxiliary warning