How will polarity test of Dy5 transformer ?

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How will polarity test of Dy5 transformer ?..

Answer / arun r

VECTOR GROUP TEST [For 3Ф Transformer Only]
1. HV Side RФ & LV -1 r Ф Short Provide.
2. 3 Phase 4 Wire Supply Applied In HV
Side.
3. For Following Voltages Measured Are In
Volts
RY YB BR RN YN BN

ry yb Br rn yn bn

Rr Ry Rb Yr Yy Yb

Br By Bb Nr Ny Nb

Rn Yn Bn Nn

VECTOR GROUP = Dyn5

PROOF
1. Ry=Rb 3.Br<Bb
2.By<Bb
4.Yy=Yb

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How will polarity test of Dy5 transformer ?..

Answer / karthick

If I short Hv side Y phase and LV side r phase what will happen

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