2.18 External Trip Commands
277
7UT613/63x Manual
C53000-G1176-C160-2
Blocking Signal for
External Faults
For transformers so-called sudden pressure relays (SPR) are occasionally installed in
the tank which are meant to switch off the transformer in case of a sudden pressure
increase. Not only transformer failures but also high traversing fault currents originat-
ing from external faults can lead to a pressure increase.
External faults are quickly recognised by the 7UT613/63x (also refer to differential pro-
tection, „Add-on Restraint during External Faults“, section 2.2). A blocking signal can
be created by means of a CFC logic in order to prevent from erroneous trip of the SPR.
Figure 2-113 CFC chart for blocking of a pressure sensor during external fault
2.18.2 Setting Notes
General The direct external trip functions are only enabled if addresses 186 EXT. TRIP 1
and/or 187 EXT. TRIP 2 have been set to Enabled during the configuration of the
functional scope.
Addresses 8601 EXTERN TRIP 1 and 8701 EXTERN TRIP 2 are used to switch the
functions individually ON or OFF, or to block only the trip command (Block relay).
Signals included from outside can be stabilised by means of a delay time and thus in-
crease the dynamic margin against interference signals. For external trip functions 1
settings are done in address 8602 T DELAY, for external trip function 2 in address
8702 T DELAY
2.18.3 Settings
Addr. Parameter Setting Options Default Setting Comments
8601 EXTERN TRIP 1 OFF
ON
Block relay
OFF External Trip Function 1
8602 T DELAY 0.00 .. 60.00 sec; ∞ 1.00 sec Ext. Trip 1 Time Delay
8701 EXTERN TRIP 2 OFF
ON
Block relay
OFF External Trip Function 2
8702 T DELAY 0.00 .. 60.00 sec; ∞ 1.00 sec Ext. Trip 2 Time Delay
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