Sharp EL-5230, EL-5250 operation manual Delta-Y impedance circuit transformation

Chapter 8: Application Examples

Delta-Y impedance circuit transformation

Transformation of a Y impedance circuit to an equivalent Delta impedance circuit and vice versa.

The Delta-Y transformation is defined by the following formula:

Z2

			R1		R2
R	Z1	Z3	Z1 Z2
Z1 = —			R1 = ———
R2			Z	R3
R			Z2 Z3
Z2 = —			R2 = ———
R3			Z
R			Z3 Z1
Z3 = —			R3 = ———
R1			Z
where R = R1R2 + R2R3 + R3R1			where Z = Z1 + Z2 + Z3

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

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