I have seen formulas that explain the k factor in a transformer as follows:
L1*(1-k)=Ll1
L1 is the total primary inductance
Ll1 is the primary leakage inductance

and

L2*(1-k)=Ll2
L2 is the total secondary inductance
Ll2 is the secondary leakage inductance

This would suggest that there must be some secondary leakage inductance if there is some primary leakage inductance. Is this true? (I cant remember the source and I might have misunderstod the variables)

 

In practice, you can't build a transformer without both primary and secondary leakage inductance.

 

In practice, you can't build a transformer without both primary and secondary leakage inductance.

Thanks for the reply! But are the formulas accurate? That the ratio of primary leakage to primary total is the same as secondary leakage to secondary total.