ISA T1000 PLUS User Manual page 27

DOC. MIE91093
There's an easy way to check the power transformer vector
group. Please make reference to the following wiring diagram.
 Connect V main to the transformer HV side phase 1 and
2 (positive and negative).
 Connect V aux to the transformer HV side phase 2 and
3 (positive and negative).
 Adjust the same voltage value on both generators.
 Adjust 240° for Vaux with respect to the mains.
 Connect the measuring input Ext V (the 600 V or the
10 V input, as a function of the transformer ratio) to LV
side terminals 1 and 2.
 Select the measurement
angle.
This way, we are generating a three phase voltage on HV side,
all voltages with 120° phase shift. But, since phase angle of
V12is 0°, the phase shift measured on ExtV per respect to
Vmain, divided by 30,
Suppose you measure 150°, the transformer group would be
150/30=5.
Rev. 1.34
of the ExtV - Vmain phase
gives you the transformer group.
Page 27 of 145