ABB REG670 - Page 153

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
Required delta CT connection type on star side of
the protected power transformer and internal
vector group setting in the IED
YNd1
Y
IEC06000559 V1 EN
DAC/Yy0
Dyn1
Y
IEC06000560 V1 EN
DAB/Yy0
YNd11
Y
IEC06000561 V1 EN
DAB/Yy0
Dyn11
Y
IEC06000562 V1 EN
DAC/Yy0
YNd5
Y
IEC06000563 V1 EN
DAB/Yy6
Dyn5
Y
IEC06000564 V1 EN
DAC/Yy6
1MRK 502 071-UEN - Section 7
Differential protection
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 147
Application manual