[SI-LIST] Re: Even/Odd mode general case
- From: Peter.Pupalaikis@xxxxxxxxxx
- To: "Tom Dagostino" <tom@xxxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 9 Feb 2012 14:50:15 -0500
Hi Tom:
Your comment brought back a memory from school back when we were still
taughtabout power systems.
I believe the "modes" you are referring to for three-phase systems are
called"symmetrical components". See
http://en.wikipedia.org/wiki/Symmetrical_components[1]
In this method, a three-phase unbalanced system is expressed as the sum of
three sets of balanced phasors.
This was used mostly to understand the behavior of a three-phase system
underfault conditions as certain "modes" do not propagate through various
transformer configurations (the combinations of deltas and wyes).
Pete
"Tom Dagostino" ---02/09/2012 02:27:22 PM---I would imagine that for
multi-phase power delivery this issue has been defined. Consider common 3
[IMG]
From:[IMG]
"Tom Dagostino" <tom@xxxxxxxxxxxxx> [IMG]
To:[IMG]
"'Beal, Weston'" <Weston_Beal@xxxxxxxxxx>, "'Doug Brooks'"
<dbrooks9@xxxxxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>, [IMG]
Date:[IMG]
02/09/2012 02:27 PM [IMG]
Subject:[IMG]
[SI-LIST] Re: Even/Odd mode general case [IMG]
Sent by:[IMG]
si-list-bounce@xxxxxxxxxxxxx
----------------------------------------------------------------------------
I would imagine that for multi-phase power delivery this issue has been
defined. Consider common 3 phase systems used throughout the world.
Depending on what is happening along the delivery system the currents can
become unbalanced and the modes change.
Tom Dagostino
Teraspeed Labs
9999 SW Wilshire St.
Suite 102
Portland, OR 97225
USA
971-279-5325 Office
971-279-5326 FAX
503-430-1065 Cell
tom@xxxxxxxxxxxxx
www.teraspeed.com
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
401-284-1827
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx[2]]
On
Behalf Of Beal, Weston
Sent: Thursday, February 09, 2012 9:49 AM
To: Doug Brooks; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Even/Odd mode general case
I consider the modes of a coupled transmission line system to be more basic
than the current or voltage. The modes are calculated from the geometry to
know how the different combinations of signals on the transmission lines can
propagate or be attenuated. The modes are calculated by eigenvectors of the
inductance and capacitance matrices of the coupled transmission line system.
Therefore, there are as many modes as there are transmission lines in the
coupled region. There is no defined terminology that I know of for the modes
in a coupled region with more than 2 signal conductors (plus reference). The
designation of the modes must be defined for each case in order to make
clear the presentation of that case.
Now, Steve can correct me as needed :)X
Regards,
Weston
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx[3]]
On
Behalf Of Doug Brooks
Sent: Wednesday, February 08, 2012 6:42 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Even/Odd mode general case
Even mode and odd mode describe the types of current that can occur on a
PAIR of (differential) traces. What is the more general description if there
are more than two traces coupled together? How many modes can exist in a
general case, and how do we denote them?
Thanks
Check out our resources at http://www.ultracad.com[4]
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list[5]
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net[6]
List archives are viewable at:
//www.freelists.org/archives/si-list[7]
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu[8]
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list[9]
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net[10]
List archives are viewable at:
//www.freelists.org/archives/si-list[11]
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu[12]
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list[13]
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net[14]
List archives are viewable at:
//www.freelists.org/archives/si-list[15]
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu[16]
--- Links ---
1 http://en.wikipedia.org/wiki/Symmetrical_components
2 mailto:si-list-bounce@xxxxxxxxxxxxx
3 mailto:si-list-bounce@xxxxxxxxxxxxx
4 http://www.ultracad.com
5 //www.freelists.org/webpage/si-list
6 http://www.si-list.net
7 //www.freelists.org/archives/si-list
8 http://www.qsl.net/wb6tpu
9 //www.freelists.org/webpage/si-list
10 http://www.si-list.net
11 //www.freelists.org/archives/si-list
12 http://www.qsl.net/wb6tpu
13 //www.freelists.org/webpage/si-list
14 http://www.si-list.net
15 //www.freelists.org/archives/si-list
16 http://www.qsl.net/wb6tpu
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
