Tripping logic
This tripping logic provides some additional features regarding blocking and tripping
options available within the function. The list below describes functionality of every
binary input and output from the function which influence the trip logic.
Available binary inputs:
BLOCK prevents operation of overload feature, at the same time all binary outputs are
forced to zero.
SETLKOUT forces lockout operation (output LOCKOUT) by external signal
RESET resets lockout and forces Theta value to zero
Available binary outputs:
TRIP, operation of the overload feature
START, current bigger than I> level
LOCKOUT, sealed-in TRIP output signal from the function. Note that lockout feature
is only enabled by setting AutoLockout = “On”
BLKRECL, output signal active as long as Theta > ReclsLevTheta, which can be used
to block closing of the generator CB
Simplified logic diagram for lockout functionality is shown in Figure
217.
AND
TRIP
OR
SETLKOUT
AND
NOT
RESET
AND
BLOCK
LOCKOUT
IEC12000010-1-en.vsd
AutoLockout
IEC12000010 V1 EN
Figure 217: Trip Lockout logic
Section 8 1MRK502052-UEN B
Current protection
462
Technical manual
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