We have recently purchased a 5kVA source for harmonic and flicker testing. The instrument also doubles as a power converter to provide European voltages, including the source voltage when performing IEC 1000-4-5 surge testing.
My situation is this: The surge generator has a backfilter on it that allows (per the standard) up to 30% let-through of the applied transient. In common mode (transient applied to the line and neutral simultaneously with respect to earth), the let-through disturbs the output of the source and the source resets, even at applied transients as low as 500V. We are currently in discussions with the 2 manufacturers regarding this situation. Has anyone else experienced a similar situation? What worked for you without affecting the calibration of the output transient waveform? I am interested to hear your experiences. I would also like to know how you approached the European power source issue, i.e., motor-generator, electronic source, other? What size source did you find adequate to mirror the results obtained by European test labs? Best regards Don Umbdenstock
