What Is The Meaning Of DYN11 In A Transformer?
DYN11 is a notation that describes a group of transformer vectors.
The vector group indicates the configuration and phase angle difference between the primary and secondary windings of the transformer.
The file consists of four parts:
The first part is a capital letter that indicates the connection type of the high voltage (HV) winding. It can be Y (star), D (triangle) or Z (zigzag).-
The second part is a lowercase letter, which represents the connection type of the low voltage (LV) winding. Everything is kept in the same convention as in the first part.-
The third part is a lowercase letter indicating whether the neutral point of the star or zigzag winding is extended (n) or not (o).-
The fourth part is a number from 0 to 11 that represents the phase shift between the HV and LV windings relative to the clock position.
For example, 0 means no phase shift, 1 means 30 degrees delay, 6 means 180 degrees delay, and 11 means 330 degrees delay. So DYN11 means that the transformer has a delta-connected high voltage winding, a star-connected low voltage winding with a pulled star point, and a phase shift with a delay of 30 degrees. This means that the LV voltage lags the HV voltage by 30 degrees in the same phase sequence.
This vector assembly is often used in distribution transformers because it allows easy grounding of the star point and reduces harmonics and unbalanced currents in the system.