A new method of calculating the critical operation time of HVCB for online monitoring & diagnosis

A new method is advanced in this paper, which based on the wavelet analysis of the line current that the HVCB switches on or off. The wavelet analysis can detect the breaks in the current clearly and those breaks are caused by electric arc during the operation of the HVCB. Since the operating time, whether open or close, has close relationship with the starting or ending time of the electric arc, the breaks detected by wavelet analysis can be used to calculate the operating time of HVCB. The process of algorithms is also devised. Data analysis from experiments shows that the method can get the operating time accurately. (4 pages)