ABB REG670 Applications Manual page 153

1MRK 502 071-UEN -
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual
The following table summarizes the most commonly used star-delta vector groups
around the world and provides information about the required type of main CT delta
connection on the star side of the protected transformer.
IEC vector group Positive sequence no-load
voltage phasor diagram
YNd1
Y
IEC06000559 V1 EN
Dyn1
IEC06000560 V1 EN
YNd11
IEC06000561 V1 EN
Dyn11
Y
IEC06000562 V1 EN
YNd5
Y
IEC06000563 V1 EN
Dyn5
IEC06000564 V1 EN
Required delta CT connection type on star side of
the protected power transformer and internal
vector group setting in the IED
DAC/Yy0
DAB/Yy0
Y
DAB/Yy0
Y
DAC/Yy0
DAB/Yy6
DAC/Yy6
Y
Section 7
Differential protection
147