How to test and satisfy the conditions of the vector group
YNd1 for power transformer?

How to test and satisfy the conditions of the vector group YNd1 for power transformer?..

Answer / a.p.nanjappa

IN THIS TEST , THE HV RPh or Uph is connected to low voltage
rPh. /uPh. then 400v 3ph is applied. various voltage are
measured. (RS,ST,TR, R-N,S-N.T-N, r-s,s-t,t-r, r-N,s-n,t-n.

then, draw the graph,
refer to electrical hand book-transformer, any text book
also,manufacturer test report

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