Ampere-turn gain of ordinary saturable reactors

THE ampere-turn gain is a fundamental quantity of ordinary saturable reactors. In the case of an ideal core material with a step-shape B-H characteristic (rectangular B-H line), the relation between load-winding ampere-turns I
L
N
L
and control-winding ampere-turns I
C
N
C
becomes a straight line, which for identical scales of ampere-turns subtends an angle of 45 degrees with the axes. Thus, in the idealized case, the ampere-turn gain represented by the slope of the control characteristic, I
L
N
L
= f(I
C
M
C
), is K
AT
= (I
L
N
L
)/(I
C
N
C
) = 1.