Transformer - K

K name N1 N2 N3 N4 Lp Ls K

Transformer model.

name circuit element name

• [N1-N2] are the Primary nodes.
• [N3-N4] are the secondary nodes.
• [Lp] Primary winding inductance.
• [Ls] Secondary winding inductance.
• [K] Winding coupling coefficient. K = 1.0 for an ideal transformer, K < 1.0 for a lossy transformer. The mutual inductance of the transformer is given by:

$M=K*\sqrt{Lp*Ls}$

Example:

K T3, 6 2 sec+ sec- 1.3e-3 4.5e-6 0.99