Well, no-one has challenged Annex B since it was first included in the
standard. Note that the standard applies up to 16 A/phase, so no big motors,
etc. 
 
With best wishes DESIGN IT IN! OOO - Own Opinions Only
 <http://www.jmwa.demon.co.uk/> www.jmwa.demon.co.uk J M Woodgate and
Associates Rayleigh England
 
Sylvae in aeternum manent.
 
From: Nyffenegger, Dave [mailto:dave.nyffeneg...@bhemail.com] 
Sent: 10 August 2017 13:15
To: John Woodgate <jmw1...@btinternet.com>; EMC-PSTC@LISTSERV.IEEE.ORG
Subject: RE: [PSES] Inrush Current
 
I think it also depends on what your EUT is.   Machinery will typically be
full of all sorts of loads, motors, transformers, power supplies, computers,
inductive, capacitive, etc.   The inrush would still be the peak current
when the mains is switched on or also when the machine is started as they
are typically two separate events.  These could last several seconds
depending on the machinery and the incoming power sine wave would probably
have little effect on it.
 
-Dave
 
From: John Woodgate [mailto:jmw1...@btinternet.com] 
Sent: Thursday, August 10, 2017 8:00 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> 
Subject: Re: [PSES] Inrush Current
 
Look at Annex B of IEC/EN 61000-3-3. I did a lot of work on this for that
Annex and you will often get different results each time, because of
differences in how the current is interrupted at the previous switch-off.
You do not select a point on the voltage waveform for the switching instant;
you can't, anyway, because you must use the product's own mains switch
(unless it doesn't have one). You switch at random points, because that is
what happens in practice. 
 
For duration,  you leave the mains voltage applied until the inrush
transient is over (look at the current waveform); this is usually after
three or fewer cycles, but for some products it can be rather longer.
Normally, the first current peak is the highest, but occasionally the second
peak is higher.
 
With best wishes DESIGN IT IN! OOO - Own Opinions Only
 <http://www.jmwa.demon.co.uk/> www.jmwa.demon.co.uk J M Woodgate and
Associates Rayleigh England
 
Sylvae in aeternum manent.
 
From: Kim Boll Jensen [mailto:k...@bolls.dk] 
Sent: 10 August 2017 12:30
To: EMC-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> 
Subject: [PSES] Inrush Current
 
Hi
 
We have several times been asked to test Inrush Current and have this
function on our Harmonic tester, but it is not defined how it measure and we
get very different measurements each time we switch ON the same EUT.
 
I can't find an IEC definition on the measurement other than "peak current".
 
I asume that it is most correctly to measure the current  by switching ON at
the top of the sine (90 deg), but what about duration?
 
A peak current with a duration of 0.1 ms is not as interresting as the same
current for 1 ms. And what if there are several current peaks after each
other such as ringing wave form?
 
Best regards,
 
Kim Boll Jensen
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