Voltech ATi User Manual page 422

T T
ESTS AND EST
For an INDUCTIVE IMPEDANCE, Rs represents the copper losses in the wire
and Rp represents the in-phase core losses. X (ωL) is usually much lower
than Rp, so Rp is insignificant. Choose the SERIES equivalent circuit.
If the inductance is large (> 1 Henry) and / or the series resistance (Rs) is very
small, the parallel equivalent circuit is sometimes used.
For a CAPACITIVE IMPEDANCE, X is usually much higher than Rp, making
Rp very significant.
Choose the PARALLEL equivalent circuit
If the capacitance is large (small impedance) then Rp will be insignificant and
the series equivalent circuit can be chosen.
P 7-124
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ONDITIONS
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ANUAL