20
TRT33A Getting Started
When generating true three phase test voltage, the TRT33A generates and outputs a true three-phase
excitation test voltage to three transformer primary windings. The induced three phase voltage across
the unloaded transformer windings are measured and the transformer turns ratio is calculated.
Applied test voltages are explained at figures and tables below. Test voltages of 1 V and 8 V are
recommended for testing of current transformers. For testing distribution or power transformers it is
recommended to use the highest test voltage, 100 V or even 40 V. Press
UP/DOWN
to set the value of
your choice and then press
ENTER
to confirm.
Table 5:
Applied single-phase voltage
Applied single-phase voltage
1 V or 1
3
V
Depends on the vector group
8 V or 8
3
V
Depends on the vector group
40 V or 40
3
V
Depends on the vector group
100 V or 100
3
V
Depends on the vector group
Table 6:
Applied true three-phase voltage
Applied true three-phase voltage
1
3
V
1U-1V,1U-1W,1V-1W
H1-H0, H1-H3, H2-H3
A1-A2, A1-A3, A2-A3
8
3
V
1U-1V,1U-1W,1V-1W
H1-H0, H1-H3, H2-H3
A1-A2, A1-A3, A2-A3
40
3
V
1U-1V,1U-1W,1V-1W
H1-H0, H1-H3, H2-H3
A1-A2, A1-A3, A2-A3
100
3
V
1U-1V,1U-1W,1V-1W
H1-H0, H1-H3, H2-H3
A1-A2, A1-A3, A2-A3
Figure 5-18:
The test voltage
selection
Figure 5-19:
Single-phase
cable set
