# What is Dyn11 Vector Group?

## What is Dyn11 Vector Group?

Example – Dyn11 Transformer has a delta connected primary winding (D) a star connected secondary (y) with the star point brought out (n) and a phase shift of 30 deg leading (11). The point of confusion is occurring in notation in a step-up transformer. The 11 indicates the LV winding leads the HV by 30 degrees.

What is the advantage of using Dyn11 instead of a dyn1 transformer?

The DYn11 satisfies the requirements for distribution system operation i.e it provides easily accessible phase voltage from the LV side, and eliminate the triplen harmonics from propagating to the HV network.

### What is advantage of Dyn11 over Dyn5?

A Dyn11 transformer, if abc terminals are connected to rst phases, will shift the output from “12 o clock” to “11 o clock” ie 30 degrees back. A Dyn5 if connected the same way will advance the output to “5 o clock” ie 150 degrees forward. The difference in output between the Dyn11 and Dny5 and is therefore 180 degrees.

What is the meaning of dyn11 Vector Group?

Dyn11 Vector group means means ; D- primary winding in ∆ connection. yn- secondary winding in star connection with neutral point. 11- There is a phase angle difference of 30-degree between the primary and secondary line voltages. The secondary line voltage lags by 30 degrees to primary voltage.

#### What is the difference between dyn1 and dyn11?

About your question, the difference between Dyn1 and Dyn11 is the relationship between the primary and secondary currents. For Dyn1, the secondary current, wye side, LAGS the delta side by 30 degrees whereas for a Dyn11, its the opposite, secondary currents, wye side, now LEAD the delta side by 30 degrees.

Why is the yn side of the Dyn transformer separately derived?

The Dyn winding vector groups do not allow zero sequence currents (commonly known as earth fault current) to pass across the transformer. Thus, the yn side of the transformer is a ‘separately derived system’ in which all earth fault current must flow through the neutral of this transformer.

## Where is the HV winding in dy11 Transformers?

In Dy1 = primary winding is in delta and secondary is in star connection and HV winding leads LV winding by 30 degree. In Dy11 = primary winding is in delta and secondary is in star connection and LV winding leads HV winding by 30 degree.