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2.31
External Trip Functions
Any signals from external protection or supervision units can be incorporated into the
processing of the digital machine protection 7UM61 via binary inputs. Like the internal
signals, they can be signaled, time delayed, transmitted to the trip matrix, and also in-
dividually blocked. By this means it is possible to include mechanical protection equip-
ment, e.g. Buchholz protection, into the processing of indications and trip commands
of the digital protection device. Furthermore interaction between protection functions
of different numerical machine protection devices of the 7UM6 series is possible.
2.31.1 Functional Description
Mode of Operation
The logic status of the corresponding assigned binary inputs is checked at cyclic inter-
vals. Change of input status is considered only if at least two consecutive status
checks have the same result. An additional time delay 8602 T DELAY is available for
the trip command.
The following figure shows the logic diagram for direct input trippings. This logic is im-
plemented in all four times in the same manner, the function numbers of the indications
are each specified for the first external trip command channel.
Figure 2-74
2.31.2 Setting Notes
General
External trip command via binary inputs is only effective and available if configured at
addresses 186 EXT. TRIP 1 to 189 EXT. TRIP 4 as Enabled. Disabled is set
if the functions are not required. Addresses 8601 EXTERN TRIP 1 to 8901 EXTERN
TRIP 4 are used to switch the functions individually ON or OFF, or to block only the
trip command (Block relay).
Like the internal signals, they can be indicated as external trippings, time delayed and
transmitted to the trip matrix. The delay times are set at addresses 8602 T DELAY
through 8902 T DELAY. Like for the protective functions, the dropout of the direct
input trippings is extended by the parametrized minimum duration TMin TRIP CMD.
7UM61 Manual
C53000-G1176-C127-3
Logic Diagram of Direct Input Trippings
2.31 External Trip Functions
189
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