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2.6
Direct Local Trip
Any signal from an external protection or monitoring device can be coupled into the
signal processing of the 7SD610 by means of a binary input. This signal can be de-
layed, alarmed and routed to one or several output relays.
2.6.1
Method of Operation
External trip of the
Figure 2-35 shows the logic diagram. If device and circuit breaker are capable of
local circuit breaker
single-phase operation, it is also possible to trip single-pole. The tripping logic of the
device ensures that the conditions for single-pole tripping are met (e.g. single-phase
tripping permissible, automatic reclosure ready).
The external tripping can be switched on and off with a setting parameter and may be
blocked via binary input.
Figure 2-35
2.6.2
Setting Notes
General
A prerequisite for the application of the direct and remote tripping functions is that
during the configuration of the scope of functions in address 122 DTT Direct Trip
= Enabled was applied. At address 2201 FCT Direct Trip it can also be switched
ON or OFF.
For direct local trip, a trip time delay can be set in address 2202 Trip Time DELAY.
This delay can be used as a grading margin.
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 2.1.2). Reliable operation of the circuit breaker is
therefore ensured, even if the initiating signal pulse is very short. This parameter can
only be altered in DIGSI at Display Additional Settings.
7SD610 Manual
C53000-G1176-C145-4
Logic diagram of the local external tripping
2.6 Direct Local Trip
89
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