Stachel, P.Zivanovic, R.Schegner, P.2009-12-112009-12-112008Proceedings of the 16th Power Systems Comutation Conference, 14-18 July, 20089780947649289http://hdl.handle.net/2440/54650To analyse power system fault events captured by disturbance recorders the sampled analogue waveforms (voltages and currents) have to be segmented into system states (pre-fault, fault,...). In this paper a combination of wavelet transform (WT) and linear prediction coding (LPC) is applied to the symmetrical space phasor signals of the voltage and current waveforms. The signals obtained contain impulses when the system state changes abruptly. A threshold for segmentation is calculated using median filtering with adaptive window length. The segment borders are finally merged and validated.enConference paper00200854202-s2.0-5774912108440003