Siemens siprotec 7SA6 User Manual page 457

Table 6-13 Single and three pole tripping depending on the type of fault
Fault type
from protection
functions)
L1
L2
L3
L1 E
L2 E
L3 E
L1 L2
L1 L2
L1 L2
L2 L3
L2 L3
L2 L3
L1 L3
L1 L3
L1 L3
L1 L2 E
L2 L3 E
L1 L3 E
L1 L2 L3
L1 L2 L3 E
E
General Trip
Reset of the
Trip Command
7SA6 Manual
C53000-G1176-C133-1
interrupted 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 7ULSSK)OW it is possible to select whether this
tripping is SROH OHDGLQJ 3K, i.e. single-pole tripping of the leading phase or
SROODJJLQJ 3K, i.e. single-pole tripping of the lagging phase. The standard
setting is SROH tripping for two-phase faults (presetting).
Table 6-13 shows a summary of the conditions under which single-pole or three-pole
tripping results.
Parameter 1156
7ULSSK)OW
(irrelevant)
(irrelevant)
(irrelevant)
(irrelevant)
(irrelevant)
(irrelevant)
SROH
SROH OHDGLQJ3K
SROH ODJJLQJ3K
SROH
SROH OHDGLQJ3K
SROH ODJJLQJ3K
SROH
SROH OHDGLQJ3K
SROH ODJJLQJ3K
(irrelevant)
(irrelevant)
(irrelevant)
(irrelevant)
(irrelevant)
(irrelevant)
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.
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 6-142). 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 output signals
5HOD\7ULS 5HOD\7ULS
S/ S/
X
X
X
X
X
X
X
X
Functions
5HOD\7ULS 5HOD\ 75,3
S/ SK
X
X
X
X
X
X
X
X
X
X
X
X
X
6-275