Answer / a.p.nanjappa

THIS IS ONE OF THE MANUFACTURER TEST OF VECTOR GROUP.
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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