Measuring the inductance in the primary side with the
secondary opened, the value obtained is equal the sum of the
leakage inductance with the magnetizing inductance. This
value can be adopted as the Lm inductance.
The winding capacitances of a transformer can not be
measured by direct ways due to the equivalent circuit
configuration. One alternative method to obtain precise
values of these capacitances is using an impedance analyzer
to identify the parallel and series resonance frequencies.
The value of Ct can be obtained substituting the Lm value
in the expression (2) and Ld is obtained substituting the Ct
value in the expression (1).