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2.10
Direct Local Trip
Any signal from an external protection or monitoring device can be coupled into the signal processing of the
7SD80 by means of a binary input. This signal may be delayed, alarmed and routed to one or several output
relays. This signal can be delayed, alarmed and routed to one or several output relays.
Functional Description
2.10.1
External Tripping of the Local Circuit Breaker
The external tripping can be switched on and off with a setting parameter and may be blocked via binary
input. The tripping logic of the device ensures that the conditions for the tripping logic are satisfied.
The phase currents and the ground current must exceed a configurable threshold to activate the tripping logic
of the device. The trip command can be delayed via a configurable time.
[lo-ext-ausloesung-20101108, 1, en_US]
Figure 2-53
Setting Notes
2.10.2
General
In order to use the direct and remote tripping functions, address 122 DTT Direct Trip must have been set
to Enabled during the configuration of the device functional scope. At address 2201 Direct Trip(DT) it
can also be switched ON or OFF.
It is possible to set a trip delay for both the local external trip and the receive side of the remote trip in address
2202 Trip Time DELAY. This delay can be used as a safety margin, especially in case of local direct tripping.
Once a trip command has been issued, it is maintained for at least as long as the set minimum trip command
duration TMin TRIP CMD which was set for the device in general in address 240 (Section
Power System Data (Power System Data
SIPROTEC 4, 7SD80, Manual
E50417-G1100-C474-A2, Edition 02.2018
Logic diagram of the local external trip
1)). Reliable operation of the circuit breaker is therefore ensured,
Functions
2.10 Direct Local Trip
2.1.3 General
129
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