99
Delta-Y impedance circuit transformation
Transformation of a Y impedance circuit to an equivalent Delta impedance
circuit and vice versa.
1. Press b 2 1 0 to open a window for creating a NEW
program.
2. Type DELTAY for the title then press e.
•A NEW program called ‘DELTAY’ will be created.
3. Enter the program as follows.
Program code Key operations
Print”(1)DELTA TO Y i 1 ( 1 ) @ a
DELTA s TO s Y ; e
Print”(2)Y TO DELTA i 1 ( 2 ) @ a Y
s TO s DELTA ; e
Input X i 2 ; X e
If X=1 Goto DTOY i 8 ; X ; = 1 ;
s i 9 @ a DTOY
; e
If X=2 Goto YTOD i 8 ; X ; = 2 ;
s i 9 @ a YTOD
; e
Label DTOY i 6 @ a DTOY ;
e
R
1
Z
1
R
2
Z
2
R
3
Z
3
The Delta-Y transformation is defined by the following formula:
R
1
= ———
R
2
= ———
R
3
= ———
where Z = Z
1
+ Z
2
+ Z
3
Z
1
Z
2
Z
Z
2
Z
3
Z
Z
3
Z
1
Z
Z
1
= —
Z
2
= —
Z
3
= —
where R = R
1
R
2
+ R
2
R
3
+ R
3
R
1
R
R
2
R
R
3
R
R
1
Chapter 8: Application Examples
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