Functions
2.4 Breaker Intertrip and Remote Tripping
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
113
2.4.2 Setting Notes
General
The intertrip function for tripping caused by the differential protection can be activated (YES) or deactivated (NO)
with address 1301 I-TRIP SEND. Since the differential protection devices theoretically operate with the same
measured values at all ends of the protected object, a tripping in the event of an internal fault normally is also
carried out at all ends, regardless of the infeed conditions at the ends. In special cases, i.e. if fault currents are
to be expected near to the pickup threshold, it may occur that one or more ends do not issue a trip command
due to inevitable device tolerances. For these cases I-TRIP SEND = YES ensures the tripping at all ends of
the protected object.
Intertrip/Remote tripping
If the intertrip function is activated, it will automatically start if the differential protection trips on one line end only.
If the relevant binary inputs are allocated and activated by an external source, the intertrip signal is transmitted
as well. In this case, the signal to be transmitted can be delayed with address 1303 T-ITRIP BI. This delay
stabilizes the transmission signal against dynamic interferences which may occur on the control cabling.
Address 1304 T-ITRIP PROL BI is used to extend a signal after it has been effectively injected from an ex-
ternal source.
The reaction of a device when receiving an intertrip/remote tripping signal is set at address 1302 I-TRIP
RECEIVE. If it is supposed to cause tripping, set the value Trip. If the received signal, however, is supposed
to cause an alarm only, Alarm only must be set if this indication is to be further processed externally.
The setting times depend on the individual case of application. A delay is necessary if the external control signal
originates from a disturbed source and a restraint seems appropriate. Of course, the control signal has to be
longer than the delay for the signal to be effective. If the signal is processed externally at the receiving end, a
prolongation time might become necessary for the transmitting end so that the reaction desired at the receiving
end can be executed reliably.
2.4.3 Settings
Addr. Parameter Setting Options Default Setting Comments
1301 I-TRIP SEND YES
NO
NO State of transmit. the intertrip
command
1302 I-TRIP RECEIVE Alarm only
Trip
Trip Reaction if intertrip command is
receiv.
1303 T-ITRIP BI 0.00 .. 30.00 sec 0.02 sec Delay for intertrip via binary input
1304 T-ITRIP PROL BI 0.00 .. 30.00 sec 0.00 sec Prolongation for intertrip via
bin.input
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