Siemens siprotec 7SD5 User Manual

2.23 Function Control and Circuit Breaker Test
405
7SD5 Manual
C53000-G1176-C169-1
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-
ping after Two-
Phase Fault
Single-pole tripping for two-phase faults is a special feature. If a phase-phase fault
without earth
occurs in an earthed system, this fault can be cleared by single-pole trip
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)
Parameter
Trip2phFlt
Output signals for trip
TRIP 1p.L1 TRIP 1p.L2 TRIP 1p.L3 Relay TRIP
3ph.
L1 (any) X
L2 (any) X
L3 (any) X
L1 E (any) X
L2 E (any) X
L3 E (any) X
L1 L2 3pole X
L1 L2 1pole leading Ø X
L1 L2 1pole lagging Ø X
L2 L3 3pole X
L2 L3 1pole leading Ø X
L2 L3 1pole lagging Ø X
L1 L3 3pole X
L1 L3 1pole leading Ø X
L1 L3 1pole lagging Ø X
L1 L2 E (any) X
L2 L3 E (any) X
L1 L3 E (any) X
L1 L2 L3 (any) X
L1 L2 L3 E (any) X
E(any) X
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Siemens siprotec 7SD5 Specifications

General

Brand	Siemens
Model	siprotec 7SD5
Category	Relays
Language	English