Siemens siprotec 7SD5 User Manual page 405

These alarms can be allocated to LEDs or output relays. In the event of three-pole trip-
ping all three alarms pick up.
If single-pole tripping is possible, the protection functions generates a group signal for
the local displaying of alarms and for the transmission of the alarms to a PC or a
central control system, e.g. „Diff TRIP 1p L1", „Diff TRIP 1p L2", „Diff
TRIP 1p L3" for single-pole tripping by the differential protection, „Dis.Trip
1pL1", „Dis.Trip 1pL2", „Dis.Trip 1pL3" for single-pole tripping by the dis-
tance protection, and „Diff TRIP L123" or „Dis.Trip 3p" for three-pole trip-
ping. Only one of these alarms is displayed at a time. These alarms are also intended
for the trip command output to the circuit breaker.
Single-pole Trip- Single-pole tripping for two-phase faults is a special feature. If a phase-phase fault
ping after Two- without earth occurs in an earthed system, this fault can be cleared by single-pole trip
Phase Fault and automatic reclosure in one of the faulted phases, as the short-circuit path is inter-
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).
The setting parameter Trip2phFlt (address 1156) allows to select whether this trip-
ping should be 1pole leading Ø, i.e. single-pole tripping of the leading phase, or
1pole lagging Ø, i.e. single-pole tripping of the lagging phase. Standard setting is
3pole, i.e. three-pole tripping after two-phase faults (default setting).
Table 2-18 Single-pole and three-pole trip depending on fault type
Type of Fault
(from Protection Func-
tion)
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
7SD5 Manual
C53000-G1176-C169-1
Parameter
TRIP 1p.L1
Trip2phFlt
(any) X
(any)
(any)
(any) X
(any)
(any)
3pole
1pole leading Ø X
1pole lagging Ø
3pole
1pole leading Ø
1pole lagging Ø
3pole
1pole leading Ø
1pole lagging Ø X
(any)
(any)
(any)
(any)
(any)
(any)
2.23 Function Control and Circuit Breaker Test
Output signals for trip
TRIP 1p.L2 TRIP 1p.L3
X
X
X
X
X
X
X
X
Relay TRIP
3ph.
X
X
X
X
X
X
X
X
X
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