how to find series inductance of a transformer
Steps


What you have to know is the transformer rating. 
Let's say the current rating is 10A for example.
short circuit the secondary but measure the current through the short.
You will need a phase angle meter such as an Arbiter 928A
Energize the primary with a voltage source being careful not to exceed the 10 amps on the secondary
Put the voltage channel A of the arbiter across the voltage element and measure the current using channel B of the arbiter. The arbiter will show the current with a positive lag angle theta by default. Say we get 45 degrees. This means that the voltage on channel A is 0 degrees and the current on channel B is 360-45=315 degrees. Say it took 10 volts to do this and the current in the primary is 2 amps. Z = 10 &lt; 0 degrees / 2 &lt; -45 degrees = 5 ohms &lt; 45 degrees.


Theory

Z = V/I, its the LAW!!

Where I = the current through the primary.
Where V = the voltage across the primary.







simulate this circuit &ndash; Schematic created using CircuitLab