We do not include power-on transients in our calculations for flicker or
harmonics. Our HP equipment ignores the first 10 seconds for this purpose.
If I recall correctly, HP has indicated that this is just one of several
ambiguous sections of these two standards.
Richard Woods
----------
From: POWELL, DOUG [SMTP:[email protected]]
Sent: Thursday, June 08, 2000 11:48 AM
To: '[email protected]'; [email protected]
Subject: RE: Looking for Inrush Current Standard
Don,
In my company we have been looking at inrush issues for our power
conversion
products. There are two reasons,
1) Customers really dislike those nuisance trips of the circuit
breaker.
They may only occur once in 10 or 100 times the product is turned
on, but it
causes problems. These trips are usually caused by rapidly filling
up of a
bulk capacitance or when a customer uses a GFCI and there is an
inrush
through fairly large "Y" caps on the EMI filter. This is usually
exacerbated when the power is turned on, at or near the top of the
line
frequency sine wave. The GFCI problem is usually not an issue with
products
that have a full time EMI filter (i.e. inline before the power
switch.).
2) The second is kind of new, as of January 1st, 2001 The European
Community is mandating compliance with the EN61000-3-2 Harmonics &
EN61000-3-3 Voltage Fluctuation and Flicker, both for equipment with
up to
16 Amps per phase. If you look at the requirements of EN61000-3-3,
you will
see that inrush may in fact cause a voltage fluctuation that is out
of
compliance. There are other standards under consideration for
equipment
with line current greater than 16 Amps per phase.
In my mind, the way to control inrush is with inductance or with one
of the
various soft-start circuits that are often used.
-doug
=================================
Douglas E. Powell
Regulatory Compliance Engineer
Advanced Energy Industries, Inc.
1625 Sharp Point Dr.
Ft. Collins, Co 80525
mailto:[email protected]
http:\\www.advanced-energy.com\
=================================
-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Thursday, June 01, 2000 7:03 AM
To: [email protected]
Subject: Looking for Inrush Current Standard
I am looking for a standard or standards (IEC, EN or similar) which
contain
inrush current requirements for power supplies.
The standard might require the inrush to be: <20A for 50 us<t<1.5ms,
<10A
for
1.5ms<t<500ms, 0.6A for t>500ms.
Do any good standards exist on inrush current?
Thanks,
Don MacArthur
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Technical Committee emc-pstc discussion list.
To cancel your subscription, send mail to:
[email protected]
with the single line:
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For help, send mail to the list administrators:
Jim Bacher: [email protected]
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For policy questions, send mail to:
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-------------------------------------------
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
To cancel your subscription, send mail to:
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with the single line:
unsubscribe emc-pstc
For help, send mail to the list administrators:
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