Siemens siprotec 7SA522 - Page 386

Functions
6-238 7SA522 Manual
C53000-G1176-C119-2
rupted in this manner. The phase selected for tripping must be the same at both line
ends (and should be the same for the entire system).
By means of the setting parameter 7ULSSK)OW it is possible to select whether this
tripping is SROHOHDGLQJ3K, i.e. single-pole tripping of the leading phase or
SROODJJLQJ3K, i.e. single-pole tripping of the lagging phase. The standard set-
ting is SROH tripping for two-phase faults (presetting).
Table 6-7 shows a summary of the conditions under which single-pole or three-pole
tripping results.
General Trip All trip signals from the protection functions are combined with an
OR function and
cause the alarm “5HOD\75,3”. This can be allocated to LED or output relay.
Reset of the
Trip Command
Once a trip command is initiated, it is phase segregatedly latched (in the event of
three-pole tripping for each of the three poles) (refer to Figure 6-126). At the same time
a minimum trip command duration 70LQ75,3&0' is started. This ensures that the
trip command is output for a sufficiently long time to the circuit breaker even if the trip-
Table 6-7 Single and three pole tripping depending on the type of fault
Fault type
from protection
functions)
Parameter 1156
7ULSSK)OW
Trip output signals
5HOD\7ULS
S/
5HOD\7ULS
S/
5HOD\7ULS
S/
5HOD\75,3
SK
L1 (irrelevant) X
L2 (irrelevant) X
L3 (irrelevant) X
L1 E (irrelevant) X
L2 E (irrelevant) X
L3 E (irrelevant) X
L1 L2 SROH X
L1 L2 SROHOHDGLQJ3K X
L1 L2 SROHODJJLQJ3K X
L2 L3 SROH X
L2 L3 SROHOHDGLQJ3K X
L2 L3 SROHODJJLQJ3K X
L1 L3 SROH X
L1 L3 SROHOHDGLQJ3K X
L1 L3 SROHODJJLQJ3K X
L1 L2 E (irrelevant) X
L2 L3 E (irrelevant) X
L1 L3 E (irrelevant) X
L1 L2 L3 (irrelevant) X
L1 L2 L3 E (irrelevant) X
E (irrelevant) X