My guess is the taps are 90 degrees out of phase with each other. This is similar to the way a house step down transformer works. Each 120v leg is out of phase with the other in the transformer giving the house 240v off the two legs but only using one phase of the power line. My house transformer is wired this way. The advantage is the common current flowing is only 100 amp max even with my 200 amp service so the wire size in the transformer can be smaller and only one hot wire feeds the transformer. This would make it impossible to phase both legs of the transformer at the same time.
Ron
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