Answer / satya dev

In the 3 phase AC systems all the phases are having Phase
displacement called electrical Angle.In the case of
transformers the windings are connnected in special Faison
called Vector group. DY11, DYn11 are the vector gruops
which are generally used in India.Testing of vector group
is only to test the electrical of Connected Phases in the
Transformers.

Answer / muhammad asghar

Vector group contains two things:
1- Scheme of Connection
2- Phase shift between LV and HV windings

For Example, if Vector Group is Dyn11 then
Capital 'D' means HV winding is connected in Delta
Small 'y' means LV winding is connected is star
Small 'n' means LV winding has a neutral also
11 means LV winding is leading HV winding by 30 degree.

We have 2 11kv/433v transformers for 2saperate acb for mv panels and 1 bus coupler acb. Suppose I’ll close bus coupler what will happen or it will be share the load. Please suggestion and any modification required.

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