Hi, i want to see the effect of configuration of the winding in toroidal transformer so i got some of various leakage values. After that, the values will be parameter in pi model of transformer. I modeled the pi model in spice, but i am still new to this spice, can i get some advice?

the Ll1 and Ll2 is leakage, so i want to vary that number then see the effect for the circuit.

or 

i shouldn't model it as pi model but model like transformer with various K (as we know that k = mutual/(leakage1*leakage2)^0.5. 

need some helps~