ABB RELION REX640 Technical Manual page 655

1MRS759142 C
REX640
Technical Manual
values I_ANGL_A2_B2, I_ANGL_B2_C2 and I_ANGL_C2_A2 show -120°, the
phase order is wrong on winding 2, for example, the low-voltage side. If the angle
values 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 593: 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
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_A3_B3
I_ANGL_B3_C3
I_ANGL_C3_A3
I_ANGL_A1_A2
I_ANGL_B1_B2
I_ANGL_C1_C2
I_ANGL_A1_A3
I_ANGL_B1_B3
I_ANGL_C1_C3
Table 594: Angle outputs when settings CT connection 1-2 and CT connection 1-3 match the
actual CT connections on windings 1, 2 and 3 but the phase order is wrong on winding
1
Angle output name
I_ANGL_A1_B1
I_ANGL_B1_C1
I_ANGL_C1_A1
Table continues on next page
Angle value Possible reason if not OK
+120 OK
+120 OK
+120 OK
+120 OK
+120 OK
+120 OK
+120 OK
+120 OK
+120 OK
±180 OK
±180 OK
±180 OK
±180 OK
±180 OK
±180 OK
Angle value Possible reason if not OK
-120 Wrong phase order
-120 Wrong phase order
-120 Wrong phase order
Section 4
Protection functions
649