ABB 615 series Technical Manual page 532

Section 4
Protection functions
526
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
GUID-5ACBF127-85A3-4E5E-A130-9F7206A2DB4C V1 EN
Figure 261: Low voltage test arrangement. The three-phase low voltage source can
be the station service transformer.
The Tapped winding control setting parameter has to be set to "Not in use" to make 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 of Tapped winding
is not needed since angle values are not affected by the tap changer position adaptation.
When injecting the currents in the high voltage 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 have to show +120 deg. Otherwise the phase
order can be wrong or the polarity of a current transformer differs from the polarities of the
other current transformers on the same side.
If the angle values I_ANGL_A1_B1, I_ANGL_B1_C1 and I_ANGL_C1_A1 show
-120 deg, the phase order is wrong on the high voltage side. If the angle values
I_ANGL_A2_B2, I_ANGL_B2_C2 and I_ANGL_C2_A2 show -120 deg, the phase
order is wrong on the low voltage side. If the angle values I_ANGL_A1_B1,
1MAC059074-MB A
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615 series ANSI
Technical Manual