ABB RELION REX640 - Page 737

I_ANGL_A3_B3, I_ANGL_B3_C3 and I_ANGL_C3_A3 show -120°, the phase order is
wrong on winding 3, for example, the tertiary side. If the angle values I_ANGL_A1_B1,
I_ANGL_B1_C1 and I_ANGL_C1_A1 do not show the same value (+120°), the polarity
of one current transformer may be wrong. For example, if the polarity of the current
transformer measuring IL2 is wrong, I_ANGL_A1_B1 shows -60°, I_ANGL_B1_C1
shows -60° and I_ANGL_C1_A1 shows +120°.
When the phase order and the angle values are correct, the angle values
I_ANGL_A1_A2, I_ANGL_B1_B2 and I_ANGL_C1_C2 should show ±180° and in case
of a three-winding transformer, also the angle values I_ANGL_A1_A3, I_ANGL_B1_B3
and I_ANGL_C1_C3 should show ±180°. There can be several reasons if this is not the
case. If the angle values are 0, most probably the value given for CT connection 1-2
(or CT connection 1-3 ) is wrong. If the angle values are something else, the value for
Phase shift Wnd 1-2 or Phase shift Wnd 1-3 may be wrong.
Table 667: Angle outputs when settings CT connection 1-2 and CT connection 1-3
match the actual CT connections on windings 1, 2 and 3
Angle output name Angle value Possible reason if not OK
I_ANGL_A1_B1 120 OK
I_ANGL_B1_C1 120 OK
I_ANGL_C1_A1 120 OK
I_ANGL_A2_B2 120 OK
I_ANGL_B2_C2 120 OK
I_ANGL_C2_A2 120 OK
I_ANGL_A3_B3 120 OK
I_ANGL_B3_C3 120 OK
I_ANGL_C3_A3 120 OK
I_ANGL_A1_A2 ±180 OK
I_ANGL_B1_B2 ±180 OK
I_ANGL_C1_C2 ±180 OK
I_ANGL_A1_A3 ±180 OK
I_ANGL_B1_B3 ±180 OK
I_ANGL_C1_C3 ±180 OK
1MRS759142 F Protection functions
REX640
Technical Manual
737