Figure 3-35B.Flux paths in a saturable-core reactor. FLUX OPPOSING
This situation causes the operating point of the saturable-core reactor to shift with the applied a.c.
However, the situation would be better if the load flux was not an influence on the control flux. Figure
3-36 shows a circuit in which this is accomplished.
During the first half cycle, the load circuit flux (dashed-line arrows) cancels in the center leg of the
core. This is shown in figure 3-36, view (A). As a result, there is no effect upon the flux from the control
circuit. During the second half cycle, the polarity of the a.c. (and therefore the polarity of the flux)
reverses as shown in view (B). The result is the same as it was during the first half cycle. There is no
effect upon the control circuit flux.
Figure 3-36A.Three-legged, saturable-core reactor. FIRST HALF CYCLE