Dear friends,

We have in our carbide palnt a 20 MVA, 11000/135 volts Furnace duty transformer. On the name plate the vector group mentioned is Diii / Diii. the primary is connected in delta in normal operation & secondary is connected in delta through furnace electrodes.

What does this vector group denote & what will be the phase angle shift in primary & secondary voltages? I could not find this group in the text books or in other commonly used vector groups of transformers.

Any answers please?

Thanks.

 

the code iii indicates independent windings. The three windings are not interconnected inside the transformer inside the transformer and is connected externally.

regards
shiraj
[email protected]

 

Thank you shiraj. This is what I needed.

Also do you know where I can get a comprehensive list if IEC vector groups and designations?