Siemens siprotec SJ62 User Manual page 257

2 Functions
Pickup Possible Loops
A A–N, A–B, C–A
B B–N, A–B, B–C
C C–N, C–A, B–C
N A–N, B–N, C–N
A, N A–N
B, N B–N
C, N C–N
A, B A–B
B, C B–C
A, C C–A
A, B, N A–B, A–N, B–N
B, C, N B–C, B–N, C–N
A, C, N C–A, A–N, C–N
A, B, C A–B, B–C, C–A
A, B, C, N A–B, B–C, C–A
Pickup Possible Loops
A A–B, C–A
B A–B, B–C
C C–A, B–C
A, B A–B
B, C B–C
A, C C–A
A, B, C A–B, B–C, C–A
Result
255
Table 2-16 Selection of the loops to be reported for wye-connected voltage transformers
Evaluated Loops
A–N or A–N and least Ph–Ph
B–N or B–N and least Ph–Ph
C–N or C–N and least Ph–Ph
least Ph–N
A–B or A–B and A–N and B–N
B–C or B–C and B–N and C–N
C–A or C–A and A–N and C–N
least Ph–Ph loop
least Ph–Ph loop
Table 2-17 Selection of the loops to be reported for phase-phase connection of voltages
Evaluated Loops
least Ph–Ph
least Ph–Ph
least Ph–Ph
least Ph–Ph loop
As result of the fault location, the following is output at the device display or obtained
using DIGSI 4:
• One or more short-circuit loops from which the fault reactance was derived,
• One or more reactances per phase in Ω secondary,
• The fault distances, proportional to the reactances, in km or miles of line, converted
on the basis of the set line reactance (entered at address 1105 or 1106, see
Section 2.1.6.2).
Note: The distance result, in miles or kilometers, can only be accurate for homoge-
nous feeder sections. If the feeder is made up of several sections with different reac-
tances, e.g. overhead line - cable sections, then the reactance derived by the fault lo-
cation can be evaluated with a separate calculation to obtain the fault distance. For
transformers, reactors, electrical machines, only the reactance result, not the distance
result, is significant.
If only one phase is picked up, then only the
appropriate phase-to-ground loop is dis-
played. If the reactance(s) of one or both Ph–
Ph loops is/are less than the Ph–N reactance,
the Ph–Ph loop with the least reactance is
also displayed.
Only the Ph–N loop with the least reactance is
displayed.
A–N The appropriate phase-to-ground loop is dis-
played.
B–N
C–N
A–B The appropriate Ph–Ph loop is displayed.
B–C
C–A
The appropriate Ph–Ph loop is always dis-
played; if the reactance differential between
the Ph–N loops is larger than 15% of the
larger Ph–N loop, both Ph–N loops are also
displayed.
Only the least Ph–Ph loop is displayed
The least Ph–Ph loop is displayed.
A–B The appropriate Ph–Ph loop is displayed.
B–C
C–A
The least Ph–Ph loop is displayed.
Comments
Comments
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015