-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of John M
Woodgate
Sent: Monday, April 26, 2010 1:11 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Harmonic Emissions Testing
Products like that are already on the market. But some other
. But some other products
don't have an economic technology that eliminates harmonic emissions.
--
This is my travelling signature, adding no superfluous mass.
John M Woodgate
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...@ieee.org] Namens Spencer, David H
Verzonden: maandag 26 april 2010 13:31
Aan: EMC-PSTC@LISTSERV.IEEE.ORG
Onderwerp: RE: [PSES] Harmonic Emissions Testing
My understanding was that the harmonics standards were largely driven by the
power utilities and billing.
With a power factor of 0.5
, or
thousands of times per second.
It is much more complex than phase control but if done right very low harmonic
emissions. Downsides are the large filters required to smooth the wave shape
and filter out the switching emissions. It also takes up a lot more room than
an SSR.
High power light
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Date: 04/26/2010 09:57 AM
Subject:Re: [PSES] Harmonic Emissions Testing
In message
0ed66cd2c9bd0a459d54fb9119a605670168e
In message
0ed66cd2c9bd0a459d54fb9119a605670168e...@mailserver.lecotc.com,
Kunde, Brian brian_ku...@lecotc.com writes
What other ?practical? furnace control methods are there that would
pass both the Harmonics and flicker emissions requirements?
Theatrical dimmers using sine wave technology
In an attempt to apply a real application to the topic of harmonic emissions,
lets take the example of a 30-50 amp single phase precision high temperature
furnace in a piece of analytical test equipment (1000ºC). The control
method of choice would be phase control to precisely control
In message 16641305538561692815456@IMAC8632, Jon Francis
jfran...@voltech.com writes
My understanding (happy to be corrected) of the reasons for harmonic
current control are:
1/ Limiting voltage distortion
2/ Limiting apparent power requirements.
Since transmission and generating capacity is
My understanding was that the harmonics standards were largely driven by the
power utilities and billing.
With a power factor of 0.5 they were only billing 50% of the power consumed.
That examples of large voltage drops on the neutral-ground bus bar in service
panels were exaggerated or anecdotal.
In message FCA549BE3ECF9D4CB8CB8576837EA4890A7256@ZEUS.cetest.local,
ce-test, qualified testing bv - Gert Gremmen g.grem...@cetest.nl
writes
I do not think that limitation of voltage distortion is the real reason
for harmonic current control.
The electricity supply experts on the IEC
-PSTC@LISTSERV.IEEE.ORG
Conversation: [PSES] Harmonic Emissions Testing
Subject: RE: [PSES] Harmonic Emissions Testing
Thanks John,
It was my understanding that if there is no logical
explanation for a set of standards rules, it's history,
compromise, or commercial interests. ;)))
I do
; EMC-PSTC@LISTSERV.IEEE.ORG
Onderwerp: Re: [PSES] Harmonic Emissions Testing
In message FCA549BE3ECF9D4CB8CB8576837EA4890A7255@ZEUS.cetest.local,
ce-test, qualified testing bv - Gert Gremmen g.grem...@cetest.nl
writes
The reasons to limit harmonic currents are not all emc-related,
and mostly
: Sun, 25 Apr 2010 12:12:51 +0100
To: ce-test, qualified testing bv - Gert Gremmen g.grem...@cetest.nl
Cc: Ken Javor ken.ja...@emccompliance.com, EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Harmonic Emissions Testing
In message FCA549BE3ECF9D4CB8CB8576837EA4890A7255@ZEUS.cetest.local,
ce-test
In message FCA549BE3ECF9D4CB8CB8576837EA4890A7255@ZEUS.cetest.local,
ce-test, qualified testing bv - Gert Gremmen g.grem...@cetest.nl
writes
The reasons to limit harmonic currents are not all emc-related,
and mostly power distribution related:
That is regarded as an EMC matter.
The issue of
, think about the environment.
Van: emc-p...@ieee.org [mailto:emc-p...@ieee.org] Namens Ken Javor
Verzonden: Friday, April 23, 2010 4:23 PM
Aan: EMC-PSTC@LISTSERV.IEEE.ORG
Onderwerp: Re: [PSES] Harmonic Emissions Testing
I don’t understand all the terminology, but from a technical point
the harmonic current in reference to
the overall load?
No: the goal is to limit *voltage distortion*. But there are BIG
problems with measuring voltage distortion for individual products, so
current is measured.
Does a higher fundamental load make the affects of harmonic emissions
less of a problem
To: EMC-PSTC@LISTSERV.IEEE.ORG
Conversation: [PSES] Harmonic Emissions Testing
Subject: RE: [PSES] Harmonic Emissions Testing
Thanks to all who replied to my earlier email.
It would help me understand the intent of the harmonic standards if I knew
what the goal of these standards were
fundamental load make the affects of harmonic emissions less of a
problem on a public low-voltage ac distribution system?
Several replies have suggested we test the instrument in different current
load modes. Here is the problem with that.
Let’s say we have an instrument that under full load draws 2
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Date: 04/22/2010 12:40 AM
Subject:Re: [PSES] Harmonic Emissions Testing
In message
0ed66cd2c9bd0a459d54fb9119a605670168d
In message
0ed66cd2c9bd0a459d54fb9119a605670168d...@mailserver.lecotc.com, dated
Wed, 21 Apr 2010, Kunde, Brian brian_ku...@lecotc.com writes:
If an instrument could operate in different modes at different current
levels, what do you use as the Reference Fundamental Current in the
61000-3-12
Emissions Testing
Subject: Harmonic Emissions Testing
I am a newbie to Harmonic Emissions Testing. It is my understanding that the
61000-3-2 standard has hard harmonic current limits (2.3 amps 3rd harmonic for
Class A) but the 61000-3-12 (2006 version) limits are a percentage of harmonic
current
I am a newbie to Harmonic Emissions Testing. It is my understanding that the
61000-3-2 standard has hard harmonic current limits (2.3 amps 3rd harmonic for
Class A) but the 61000-3-12 (2006 version) limits are a percentage of harmonic
current referenced from the fundamental current.
My
I am just rejoining the forum after a few weeks absence for vacation and
server/domain changes.
Early in September it appeared that the harmonic emissions standard EN
61000-3-2 might be ammended (with A14) to redefine equipment
classifications, specifically Class D. Does anyone have a reliable
...@geneticmicro.com]
Sent: Tuesday, September 26, 2000 4:41 PM
To: IEEE EMC Forum (E-mail)
Subject: Harmonic emissions
I am just rejoining the forum after a few weeks absence for vacation
and
server/domain changes.
Early in September it appeared
emissions
I am just rejoining the forum after a few weeks absence for vacation and
server/domain changes.
Early in September it appeared that the harmonic emissions standard EN
61000-3-2 might be ammended (with A14) to redefine equipment
classifications, specifically Class D. Does anyone have
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