... transformer for power system harmonic frequencies, IEEE Transactions on Power Delivery, Volume 10, Issue 4, Oct. 199 5 Power Quality Harmonics Analysis and Real Measurements Data 92 Wideband analysis ... their identification and modelling is problematic (Vermeulen at al., 199 5, Islam at al., 199 7, Luszcz, 2004a, 2004b, Power Quality Harmonics Analysis and Real Measurements Data 108 Yao Xiao; ... and low rated power, intended to supply only measuring inputs Power Quality Harmonics Analysis and Real Measurements Data 106 -30 0 30 60 90 0.00.51.01.52.02.510 Hz2 kHz 9 ...