Siemens SIPROTEC 7SJ62 Instruction Manual page 284

Functions
6-144
Table 6-3 Selection of Paths to be Reported for Wye-Connected Voltage Transformers
Pickup Possible Paths
A A–G, A–B, C–A
B B–G, A–B, B–C
C C–G, C–A, B–C
G A–G, B–G, C–G
A, G A–G
B, G B–G
C, G C–G
A, B A–B, A–G, B–G
B, C B–C, B–G, C–G
A, C C–A, A–G, C–G
A, B, G A–B, A–G, B–G
B, C, G B–C, B–G, C–G
A, C, G C–A, A–G, C–G
A, B, C A–B, B–C, C–A
A, B, C, G A–B, B–C, C–A
Evaluated Paths
A–G or If only one phase is
A–G and least L–L
picked up, then only the
appropriate phase-to-
ground path is displayed.
B–G or
B–G and least L–L If the reactance's of one
or both φ-φ paths are less
than the φ-G reactance,
then the φ-φ path with the
C–G or
C–G and least L–L least reactance is also
displayed.
Only the φ-G path with the
least L–G
least reactance is dis-
played.
A–G
The appropriate phase-
B–G
to-ground path is dis-
played
C–G
The appropriate φ-φ path
A–B or
A–B and A–G and B–G
is always displayed; if the
reactance differential be-
tween the φ-G paths is
B–C or
B–C and B–G and C–G larger than 15% of the
larger φ-G path, then both
φ-G paths are also dis-
C–A or
played.
C–A and A–G and C–G
The appropriate φ-φ path
A–B or
A–B and A–G and B–G
is always displayed; if the
reactance differential be-
tween the φ-G paths is
B–C or
B–C and B–G and C–G larger than 15% of the
larger φ-G path, then both
φ-G paths are also dis-
C–A or
played.
C–A and A–G and C–G
Least φ-φ path
Only the least φ-φ path is
displayed.
Least φ-φ path
Notes
7SJ62 Manual
C53000-G1140-C121-1