Hi Bob:
I have a copy of IEC61000-4-11:1994. Take another look at clause 6.1.1.
It says the peak inrush current drive capability '... need not exceed 500A for
220V-240V mains, or 250A for 100V-120V mains.'
For a minimum capability, look at clause 6.2.2. It says that 'the measured
EUT peak inrush current shall be less than 70% of the peak current drive
capability of the generator, ...'
Ipk.EUT < 70% * Ipk.generator
Solving for Ipk.generator gives:
Ipk.EUT * 143% < Ipk.generator
Note the special test conditions for measuring the EUT peak inrush current in
Annex A.
So your generator needs to be capable of a peak current between Ipk.EUT *
143% and 500A.
As far as your 'AC fault' information is concerned, ask your associate where
it is documented.
Pat Lawler
EMC Engineer
SL Power Electronics Corp.
[email protected] wrote on 05/20/2008 05:11:26 AM:
> A question came up recently where I work about the current
> requirements of the AC source used for testing voltage dips and
> interrupts. I was told the scope of the standard is for products up
> to 16A and that *includes* inrush current during turn-on.
> I referenced table 6.1.1 where the peak inrush current capability
> must be 500A for 200 - 240v mains voltage, but was told this table
> only covers AC fault conditions, not normal operations (including turn-on).
> Since one of the tests is a >95% interruption for 5 seconds, would
> this be considered an AC fault, or a normal turn-on for the EUT?
> Appendix A sure makes it sound like the inrush requirement is for
> the power-up of the EUT. - ----------
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