In alt.engineering.electrical Michael Moroney wrote:

| Are the load tap generators configured make-before-break?
| Break-before-make would mean a (very short) power outage every activation
| but make-before-break would mean a momentarily short-circuited winding and
| the break would involve interrupting a large short circuit current.

I wonder how much regulation could be managed through the use of variable
leakage inductance in the transformer windings.


| Certainly modern ones likely use thyristors and zero crossing detectors.

With zero crossing detection, then the switching is not happening on all phases
at the same time.

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