Tuesday, April 28, 2009

Delta Star conversions

In three phase applications, Delta connected circuits can be replaced by star connected circuits with the same resultant impedance. The Delta impedances are Z12, Z23 and Z31. These can be replaced by star impedances Z10, Z20 and Z30.

For the calculations, the impedance Zxx is expressed as R + JX where R is the resistive component and X is the reactive component.

For an inductor, X = 2 x pi x F x L and
for a capacitor, X = -1/(2 x pi x F x C) NB X value for capacitor is negative!!

where:
pi = 3.142
F = operating frequency
L = inductance
C = Capacitance.

The values can be entered and diplayed in either decimal format or in exponential format.
1e-3 = 0.001
1.45e2 = 145

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