home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Libris Britannia 4
/
science library(b).zip
/
science library(b)
/
ELECTRON
/
H478.ZIP
/
DELTA-Y.ZIP
/
DELTA-Y.DOC
next >
Wrap
Text File
|
1990-09-07
|
6KB
|
160 lines
DELTA-Y: The Delta-Wye Conversion Program
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Copyright (c) 1990 Aurora Software
May 27, 1990
Version 1.00
INTRODUCTION
A very useful, but often overlooked technique in the
analysis of linear electronics circuits is the Delta-Wye
conversion. This conversion allows you to transform the three
resistors of a delta connection to three resistors of a wye
connection (or the other way around) such that the overall effect
to the rest of the circuit is the same. Many times this can
greatly decrease the difficulty of analyzing the overall circuit.
The DELTA-Y.EXE program automates the delta-wye
conversion process by calculating the appropriate resistor
values for either delta-to-wye or wye-to-delta conversions. The
program should run on an PC compatible machine under the DOS
environment. Only text screens are used, so the program can be
run without the aid a graphics adapter.
SHAREWARE NOTICE
This program, and all included documentation, is Copyright
(c) 1990 Aurora Software, all rights reserved. This program has
NOT been released to the Public Domain.
This program is distributed under the Shareware concept "as
is" with no warranties, either expressed or implied. The user of
this software assumes full responsibility for loss of any kind
resulting from the use of this software. The author shall not be
liable for any such losses.
You may freely copy and distribute this software as long as
the following four conditions are met:
(1) This software and all included documentation and files are
not modified in any way.
(2) All included files and documentation accompanies the
software.
(3) No fee in excess of $6.00 is charged for copies of this
software.
(4) This software is neither used nor distributed for commercial
purposes.
If you uses this software on a regular basis, you must send
your contribution ($5 suggested (but more always welcome)) to the
address below. Your contribution will be used to develop other
software under the Shareware concept.
Aurora Software
P.O. Box 080133
Rochester, MI, 48308-0133.
INCLUDED FILES
The following files should have been included with the LINE
program:
DELTA-Y.EXE ; The self-contained executable file.
DELTA-Y.DOC ; This file.
ORDER.ASC ; A combination registration form and mailer.
; Just copy it to a printer, fill it out,
; fold it up, enclose fee, and mail.
THE DELTA-WYE TRANSFORMATION
Figure #1 shows three resistors, Ra, Rb, and Rc, arranged in
what is commonly called a "delta" configuration. Note that this
is only a small part of a much larger circuit, and that this
circuit is connected to the three resistors ONLY at the three
nodes X, Y, and Z.
Very similar to first figure, Figure #2 shows an arrangement
of three resistors also connect to an external circuit only at
nodes X, Y, and Z. The resistors in this figure, R1, R2, and R3,
are connected in a "wye" (sometimes just written as just a "Y")
configuration.
According to the Delta-Wye conversion theorem, if the values
of resistors Ra-Rc and R1-R3 are properly chosen, the large
external circuit will not be able to discriminate which of the
two structures are connected to it at nodes X, Y, and Z. Another
way of saying this is that if you have a circuit with three
resistors connect as in Figure #2 but you don't have the
necessary resistor values, you can substitute the circuit of
Figure #1 if you properly size the new resistor values. You can,
of course, also use the transformation in the other direction
when necessary, converting from a wye to a delta network.
X X
/\ |
/ \ R3
/ \ |
Ra Rb +
/ \ / \
/ \ R1 R2
Y --------- Rc --------- Z Y / \ Z
Figure #1 Figure #2
GENERAL PROGRAM INSTRUCTIONS
Boot the program by typing "DELTA-Y.EXE" (no quotes) at the
DOS prompt and pressing the Return key. For monochrome monitor
users, include a "/M" parameter (e.g. "C>DELTA-Y.EXE /M") to
prohibit the use of colors. Next, press the spacebar once to
pass through a page of introductory material, namely, the
Shareware notice. This should bring you to the program's Main
Menu.
Five alternatives are presented in the Main Menu. To make a
selection you may either press the key that corresponds to the
number before a choice, or you may scroll through the selections
with the arrow keys, pressing Return when the dark selection bar
covers your desired response.
The first two items in the Main Menu provide on-line
information about the program. The first option supplies you
with a condensed version of the information detailed in this
file, while the second displays a one-page reference sheet of the
component names used in the program (i.e. Figures #1 and #2
above).
Use selections 3 and 4 to perform your analysis, either
converting from a delta to a wye connection (Item #3) or from a
wye to a delta connection (Item #4). The program will prompt you
for the required input values in either case.
When you are finished with your analysis, you may exit the
program be selecting item 5 from the Main Menu. After confirming
the Exit command the program will return you to the DOS
environment.
=-=-=-=-=-=-= END OF FILE =-=-=-=-=-=-=-=