A Scott transformer (3/2Φ) is a transformer that takes two single-phase circuits (secondary) from three-phase (primary).
It is mainly used to take electric light from the power source.

Our standard Scott transformers are designed to operate without problems even if the load balance on the secondary side is unbalanced, as long as it is within the rated capacity,

The example graphs in the movie are (1) The graph shows the currents in the primary U, V, and W phases when Main-seated transformer is set at 100% load and T-seated transformer is varied from 0 to 100%. and the other graph of the primary U, V, and W phase currents when the secondary side utilization T-seated transformer is set at 100% load and Main-seated transformer is varied from 0 to 100%.

For details, please refer to the video.

2023.4.7：FAQ What is the secondary side load balance of a Scott transformer (3/2 Φ)?