ABB RELION REX640 Technical Manual page 705

1MRS759142 F
Vector group of
the transformer
ZNy1
Zy5
Zyn5
ZNyn5
ZNy5
Zy7
Zyn7
ZNyn7
ZNy7
Yy0
Commissioning
The correct settings, which are
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
Figure 400: Low voltage test arrangement. The three-phase low voltage source can
be the station service transformer.
The
sure that the monitored current values are not scaled by the automatic adaptation
to the tap changer position. When only the angle values are required, the setting
Tapped winding is not needed since angle values are not affected by the tap
of
changer position adaptation.
REX640
Technical Manual
Winding 1 type
ZN
Z
Z
ZN
ZN
Z
Z
ZN
ZN
Y
Tapped winding control setting parameter has to be set to "Not in use" to make
Winding 2 type Clock number
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
CT connection type , Winding 1 type , Winding 2
Protection functions
Zro A
Elimination
Not needed
Not needed
Not needed
HV side
Not needed
Not needed
Not needed
HV side
Not needed
Not needed
.
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705