Siemens SIPROTEC Manual page 453

The tripping logic combines the trip signals from all protection functions. The trip commands of those functions
that allow single-pole tripping are phase segregated. The corresponding indications are named „Relay TRIP
L1", „Relay TRIP L2" and „Relay TRIP L3".
These indications can be allocated to LEDs or output relays. In the event of three-pole tripping all three indi-
cations are displayed. These alarms are also intended for the trip command output to the circuit breaker.
For the local display of fault indications and for the transmission of the indications to a personal computer or a
central control system, the summarized image of the trip signals is also available to the protection functions -
provided that single-pole tripping is possible - e.g. for single-pole tripping by differential protection „Diff TRIP
1p L1", „Diff TRIP 1p L2", „Diff TRIP 1p L3" or by distance protection „Dis.Trip 1pL1",
„Dis.Trip 1pL2", „Dis.Trip 1pL3" and „Diff TRIP L123" or „Dis.Trip 3p" for three-pole trip-
ping; only one of these indications is displayed at a time.
Single-pole tripping for two-phase faults
Single-pole tripping for two-phase faults is a special feature. If a phase-to-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 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).
The setting parameter Trip2phFlt (address 1156) allows to select whether this tripping is to be 1pole
leading Ø, i.e. single-pole tripping in the leading phase or 1pole lagging Ø, i.e. single-pole tripping in the
lagging phase. Standard setting is 3pole tripping in the event of two-phase faults (default setting).
Table 2-19 Single-pole and three-pole trip depending on fault type
Type of Fault
(from Protection Function)
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
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
Parameter
TRIP 1p.L1
Trip2phFlt
(any)
(any)
(any)
(any)
(any)
(any)
3pole
1pole leading Ø
1pole lagging Ø
3pole
1pole leading Ø
1pole lagging Ø
3pole
1pole leading Ø
1pole lagging Ø
(any)
(any)
(any)
(any)
(any)
(any)
2.25 Function Control and Circuit Breaker Test
Output signals for trip
TRIP 1p.L2
X
X
X
X
X
X
X
X
Functions
TRIP 1p.L3 Relay TRIP 3ph.
X
X
X
X
X
X
X
X
X
X
X
X
X
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