vector group of transformer

[isi2sam]

whats the vector group of a transformer and how can you relate it to load balancing of a transformer

 

[cuky2000]

The vector group denotes the way in which the windings are connected and the phase position of their respective voltage vectors. It consists of letters identifying the configuration of the phase windings and the number indicating the phase angle between the phase-to-neutral voltages of the windings.

The ANSI notations are not identical to the IEC marketplace (See ANSI/IEEE Std C57.70). For the IEC marketplace the winding connections are categorized as follows:

a) Delta (D,d)
b) Start (Y,y)
c) Interconnected Star (Z,z)
d) Open (III, iii)

<sub>IEC NOTATION:

Capital Letter = HV winding, lower case letter = MV or LV winding.
Number = multiple of 30o denotes the angle by which the vector of LV winding lags that of the HV winding</sub>

See the enclose site for additional reference

http://www.riedel-trafobau.de/english/pdf_eng/b/gen_e.pdf

b]how can you relate it to load balancing of a transformer?[/b] Please clarify your question.

 

[isi2sam]

how can you relate the vector group of a transformer to load balancing of the transformer. the effect of unbalanced load to the vector group of a transformer.

 

[ScottyUK]

Consider the imbalance in terms of ampere-turns for each winding. Then work out how an current imbalance on one phase on side of the transformer shows up on the other side. Hint: a load connected phase-neutral on a star wound winding shows up as current flowing in two phases of the delta winding, for example. I'm not 100% sure if this is a homework question, so I'm damned if I'm going to write out what is in any standard electrical enigneering text.



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