Brian,
Seeing higher surge voltages after the mains filter may be due to
resonance and the "Q" of the circuit. In short, the filter might be
creating a tuned circuit for the frequencies containted in the surge
waveform. Keep in mind that the surge itself could also cause the
inductor to saturate, making the model of your RLC tuned circuit have
less inductive reactance than you think.
One of the best practical explanations I've seen of RLC resonances of
and Q is in the ARRL Handbook for Radio Amateurs.
Dave
______________________________ Reply Separator _________________________________
Subject: Surge Test Question
Author: [email protected] at INTERNET
List-Post: [email protected]
Date: 5/31/2001 11:01 AM
When troubleshooting surge problems on products we often see the surge pulse to
be much higher after the line filter (testing the AC Mains with Line-Earth surge
pulses according to EN61000-4-5).
Can someone explain the science behind this and what effect the load might have?
Can this increase in the surge potential be anticipated ahead of time so proper
clearances can be designed in?
Thanks,
Brian Kunde
LECO Corp.
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