Vector group Step-up transformer types Parameter 9141
5 Yd5, Dy5, Yz5 150 °
6 Yy6, Dd6, Dz6 180 °
7 Yd7, Dy7, Yz7 -150 °
8 Dd8, Dz8 -120 °
10 Dd10, Dz10 -60 °
11 Yd11, Dy11, Yz11 -30 °
INFO
DEIF does not take responsibility that the compensation is correct. Before closing the breaker, DEIF recommends that
customers always measure the synchronisation themselves.
INFO
If voltage measurement is connected incorrectly, the setting in parameter 9141 will be wrong.
INFO
The setting shown in the table above does not include any phase angle twist made by measurement transformers.
INFO
The settings shown in the table above are not correct if a step-down transformer is used. These settings are shown later.
6.44.3 Setup of step-up transformer and measurement transformer
If the HV side of the transformer is transforming the voltage up to a voltage level higher than 690 V AC, it will be necessary with
measurement transformers. The setup of all these parameters can be done from the utility software, and will be explained by an
example:
Controller
G
Busbar 10 kV
Dz4
10/0.4 kV
Measurement
transformer
10/0.1 kV
Current transformer
300/5 A
U
GEN
= 400 V
I
GEN
= 250 A
400 V AC
direct input
• The transformer is a Dz4 step-up transformer, with nominal settings of 10/0.4 kV.
• The generator has a nominal voltage of 0.4 kV, nominal current of 250 A, and a nominal power of 140 kW.
• The measurement transformer has a nominal voltage of 10/0.1 kV, and no phase angle twist.
DESIGNER'S HANDBOOK 4189341275A EN Page 174 of 196
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