ABB RELION REX640 Technical Manual page 622

Section 4
Protection functions
616
Vector group of the Winding 1 type
transformer
Yzn7 Y
Yz11 Y
YNz11 YN
YNzn11 YN
Yzn11 Y
Zy1 Z
Zyn1 Z
ZNyn1 ZN
ZNy1 ZN
Zy5 Z
Zyn5 Z
ZNyn5 ZN
ZNy5 ZN
Zy7 Z
Zyn7 Z
ZNyn7 ZN
ZNy7 ZN
Yy0 Y
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
Winding 2 type Clock number
zn Clk Num 7
z Clk Num 11
z Clk Num 11
zn Clk Num 11
zn Clk Num 11
y Clk Num 1
yn Clk Num 1
yn Clk Num 1
y Clk Num 1
y Clk Num 5
yn Clk Num 5
yn Clk Num 5
y Clk Num 5
y Clk Num 7
yn Clk Num 7
yn Clk Num 7
y Clk Num 7
y Clk Num 0
1MRS759142 C
Zro A Elimination
Not needed
Not needed
Not needed
LV side
Not needed
Not needed
Not needed
HV side
Not needed
Not needed
Not needed
HV side
Not needed
Not needed
Not needed
HV side
Not needed
Not needed
.
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REX640
Technical Manual