Appendix B -Settings and Signals
ORDINAL SIGNAL NAME ELEMENT NAME
DESCRIPTION
Aided scheme 1 DEF trip command (output from aided tripping logic)
Aided 2 channel out of service signal (COS) or loss of guard signal (LGS) in distance unblocking schemes. This signal is normally driven
from an opto input on conventional channels or from InterMiCOM
Aided channel 2 - external signal received, for input to distance fixed scheme logic
Aided channel 2 - internal signal received generated in the signal receive logic
Prevent sending by customized logic - aided scheme 2
Programmable send logic for special customized scheme (aided channel 2)
Aided channel 2 send - internal send signal generated in signal send logic
DDB_AIDED2_CUSTOM_TIMER_IN
When using a custom programmable aided scheme 2, the user is able to include a current reversal guard timer. Energizing this DDB
will additionally start this timer, from PSL
DDB_AIDED2_CUSTOM_TIMER_OUT
When using customized aided scheme 2, this signal is used to indicate any additional condition that should be treated as permission
for an aided trip (for example a permissive signal received could be connected, or a blocking signal could be inverted and then
Aided scheme 2 trip enable - this is a permissive signal used to accelerate zone 2, or a blocking signal which has been inverted. It is a
signal output, part-way through the internal fixed logic of aided schemes
DDB_AIDED2_CUSTOM_TRIP_ENABLE
Aided scheme 2 distance trip command (output from aided tripping logic)
Aided Scheme 2 Delta Directional Trip command (output from Aided tripping logic)
Aided scheme 2 DEF trip command (output from aided tripping logic)
Any trip signal - can be used as the trip command in three-pole tripping applications
Trip signal for CB1 phase A - used as a command to drive CB1 trip A output contact(s). Takes the output from the internal trip
conversion logic
Trip signal for CB1 phase B - used as a command to drive CB1 trip B output contact(s). Takes the output from the internal trip
conversion logic
Trip signal for CB1 phase C - used as a command to drive CB1 trip C output contact(s). Takes the output from the internal trip
conversion logic
Trip signal for CB1 3ph - used as a command to drive CB1 trip 3ph output contact(s). Takes the output from the internal trip
conversion logic
2 or 3 phase fault indication - used to flag whether the fault is polyphase. Typically used to control auto-reclose logic, where auto-
reclosing is allowed only for single phase faults
3 phase fault indication. Typically used to control auto-reclose logic, where auto-reclosing is blocked for faults affecting all three
phases together
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