ABB Relion 620 Series - Page 543

Vector group of
the transformer
Winding 1 type Winding 2 type Clock number Zro A
Elimination
Yzn7 Y zn Clk Num 7 Not needed
Yz11 Y z Clk Num 11 Not needed
YNz11 YN z Clk Num 11 Not needed
YNzn11 YN zn Clk Num 11 LV side
Yzn11 Y zn Clk Num 11 Not needed
Zy1 Z y Clk Num 1 Not needed
Zyn1 Z yn Clk Num 1 Not needed
ZNyn1 ZN yn Clk Num 1 HV side
ZNy1 ZN y Clk Num 1 Not needed
Zy5 Z y Clk Num 5 Not needed
Zyn5 Z yn Clk Num 5 Not needed
ZNyn5 ZN yn Clk Num 5 HV side
ZNy5 ZN y Clk Num 5 Not needed
Zy7 Z y Clk Num 7 Not needed
Zyn7 Z yn Clk Num 7 Not needed
ZNyn7 ZN yn Clk Num 7 HV side
ZNy7 ZN y Clk Num 7 Not needed
Yy0 Y y Clk Num 0 Not needed
Commissioning
The correct settings, which are CT connection type , Winding 1 type , Winding 2
type and Clock number , for the connection group compensation can be verified
by monitoring the angle values I_ANGL_A1_B1, I_ANGL_B1_C1, I_ANGL_C1_A1,
I_ANGL_A2_B2, I_ANGL_B2_C2, I_ANGL_C2_A2, I_ANGL_A1_A2, I_ANGL_B1_B2
and I_ANGL_C1_C2 while injecting the current into the transformer. These angle
values are calculated from the compensated currents. See signal description from
Monitored data table.
When a station service transformer is available, it can be used to provide current
to the high voltage side windings while the low voltage side windings are short-
circuited. This way the current can flow in both the high voltage and low voltage
windings. The commissioning signals can be provided by other means as well. The
minimum current to allow for phase current and angle monitoring is 0.015 I
r
.
1MRS757644 H
Protection functions
620 series
Technical Manual
543