ABB RELION 620 Series Technical Manual page 449

1MAC504801-IB E
620 series ANSI
Technical Manual
Commissioning
The settings for the connection group compensation (CT connection 1-2, Phase shift Wnd
1-2 and in case of three-winding transformer also CT connection 1-3 and Phase shift Wnd
1-3 settings) 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 and in case
of three-winding transformer also I_ANGL_A3_B3, I_ANGL_B3_C3,
I_ANGL_C3_A3, I_ANGL_A1_A3, I_ANGL_B1_B3 and I_ANGL_C1_C3) when
injecting the current into the transformer. These angle values are calculated from the
compensated currents.
When a station service transformer is available, it can be used to provide current into the
winding 1 side, for example, HV windings, while the winding 2 side, for example, LV
windings are short-circuited, as shown in
transformer, the tertiary winding side would be short-circuited). This way the current can
flow both in high-voltage and low-voltage windings (and in winding 3 in case of three-
winding transformer). The commissioning signals can also be provided through other
means. The currents need to be at least 0.015 p.u. to allow the phase current and angle
monitoring.
A1
B1
C1
3 phase
low voltage
source
GUID-53EEAE7E-1113-44F1-8D31-ED068403DA91 V1 EN
Figure 207: Low-voltage test arrangement. The three-phase low-voltage source can
be the station service transformer, for example.
The control setting Tapped winding should be set to value "Not in use" to ensure that the
monitored current values are not scaled by the automatic adaptation to the tap changer
position. When only the angle values are taken, this is not needed since the angle values
are not affected by the tap changer position.
When injecting the currents into the HV winding, the angle values I_ANGL_A1_B1,
I_ANGL_B1_C1, I_ANGL_C1_A1, I_ANGL_A2_B2, I_ANGL_B2_C2 and
I_ANGL_C2_A2, and in case of three winding transformer, I_ANGL_A3_B3,
I_ANGL_B3_C3 and I_ANGL_C3_A3, should be +120.
Protection functions
figure 207 (in case of three-winding
YNyn0
Section 4
A2
B2
C2
443