Hi Neil:
All I get on visiting the site is 404 Page not found error on their
home page. Access to all other pages seems to be ok. Using their search
engine facility does not seem to find anything with respect to
application notes or harmonics. Anyone else have this problem?
I read in !emc-pstc that Rich Nute ri...@sdd.hp.com wrote (in
200301311957.laa25...@epgc264.sdd.hp.com) about 'Unity Power Factor'
on Fri, 31 Jan 2003:
Fluke has a good explanation of the deleterious
effects of harmonics. See:
http://www.fluke.com/ElectricPower/elec.asp
Thank you.
--
Hi John:
Thank you for that and the rest of the information, which could prove to
be very helpful indeed. I would like to use it in my continuing efforts
to defuse the arguments between the former TC74 experts in TC108 and the
SC77A/WG1 people. May I say that the information came
Hi John:
Yes, delta-wye distribution transformer overheating
does occur due to the circulation and dissipation of
the triplen harmonics in the primary (delta) winding.
Thank you for that and the rest of the information, which could prove to
be very helpful indeed. I
I read in !emc-pstc that Rich Nute ri...@sdd.hp.com wrote (in
200301292324.paa09...@epgc264.sdd.hp.com) about 'Unity Power Factor'
on Wed, 29 Jan 2003:
Yes, delta-wye distribution transformer overheating
does occur due to the circulation and dissipation of
the triplen harmonics in the primary
I read in !emc-pstc that Rich Nute ri...@sdd.hp.com wrote (in
200301301638.iaa15...@epgc264.sdd.hp.com) about 'Unity Power Factor'
on Thu, 30 Jan 2003:
As Ken Javor described, in the USA, voltage
distortion is largely a local (privately-owned
wiring) premises problem due to excessive
series
I read in !emc-pstc that Ken Javor ken.ja...@emccompliance.com wrote
(in 0h9j008afer...@mtaout03.icomcast.net) about 'Unity Power Factor'
on Thu, 30 Jan 2003:
Yes I am in the US so clearly I must have been mistaken. Seriously, when
that business started in 1989 there were relatively few PCs in
day
long. It would have been interesting, in retrospect, to have taken line
voltage oscillographs at representative locations as the PC density
increased.
From: John Woodgate j...@jmwa.demon.co.uk
To: emc-p...@majordomo.ieee.org
Subject: Re: Unity Power Factor
Date: Wed, Jan 29, 2003, 4:01 PM
Hi John:
Aren't you in the USA? If so, you must have imagined the peak-
flattening. I am assured by the US experts on SC77A/WG1 that this
phenomenon is unknown in USA, and the only effect of IEC/EN 61000-3-2 is
that it increases the prices of PCs dramatically and keeps US
I read in !emc-pstc that Ken Javor ken.ja...@emccompliance.com wrote
(in 0h9h00l4ovp...@mtaout02.icomcast.net) about 'Unity Power Factor'
on Wed, 29 Jan 2003:
I noticed this several years ago at
the office building I worked in at the time. My cube moved from one end of
the building to another,
Hi John:
The only other problem that I know of is distribution
transformer overheating. But, I believe such
transformers are very much larger than 3 kVA, so 3 kVA
of non-linear loads would have very little effect.
I mean *concentrations* of loads, individually below 3
at the two different cubes. This is a power/crest factor issue, not
directly a harmonic issue, although drawing current only near the peak of
the waveform will definitely generate harmonics.
From: John Woodgate j...@jmwa.demon.co.uk
To: emc-p...@majordomo.ieee.org
Subject: Re: Unity Power Factor
I read in !emc-pstc that Rich Nute ri...@sdd.hp.com wrote (in
200301291623.iaa07...@epgc264.sdd.hp.com) about 'Unity Power Factor'
on Wed, 29 Jan 2003:
Hi John:
In the USA, this has largely been fixed by a change in
the USA National Electrical Code.
There must be quite a
Hi John:
In the USA, this has largely been fixed by a change in
the USA National Electrical Code.
There must be quite a number of installations that are not yet upgraded.
Where a problem existed, it was fixed by pulling
another neutral.
Are there any other problems
I read in !emc-pstc that Rich Nute ri...@sdd.hp.com wrote (in
200301281747.jaa29...@epgc264.sdd.hp.com) about 'Unity Power Factor'
on Tue, 28 Jan 2003:
Hi John:
No, this is not much of an issue for the U.S. (unless your facility
is
actually affecting the utility);
...
Hi John:
No, this is not much of an issue for the U.S. (unless your facility
is
actually affecting the utility);
... or frying the neutral conductors with third-harmonic current.
In the USA, this has largely been fixed by a change in
the USA National Electrical Code.
I read in !emc-pstc that boconn...@t-yuden.com wrote (in F7E9180F6F7F58
40858d3db815e4f7ad1f2...@cms21.t-yuden.com) about 'Unity Power Factor'
on Mon, 27 Jan 2003:
No, this is not much of an issue for the U.S. (unless your facility is
actually affecting the utility);
... or frying the
I read in !emc-pstc that don_macart...@selinc.com wrote (in OF26C3658E.
a50db9b6-on88256cbb.00613...@selinc.com) about 'Unity Power Factor' on
Mon, 27 Jan 2003:
Why are so many U.S. manufacturers using Unity Power Factor correctors in
low wattage power supplies?
Are there any U.S. requirements
Sir
A rather large bucket of worms, these PFC and conducted emissions issues (pls
see 61000-3-2).
No, this is not much of an issue for the U.S. (unless your facility is
actually affecting the utility); but I have read that the EC is currently
engaged is some interesting emission requirements
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