Appendix B -Settings and Signals
ORDINAL SIGNAL NAME ELEMENT NAME
DESCRIPTION
Inhibit stage 2 residual overvoltage protection
Inhibit thermal overload protection
Inhibit circuit breaker state monitoring (no alarm for defective/stuck auxiliary contact)
Inhibit circuit breaker fail protection
Broken conductor protection
Inhibit VT supervision (including turn OF MCB’s) via PSL
Inhibit CT supervision (both differential and standard CTS) via PSL
Inhibit checksync. (Both stages and for each CB)
Inhibit trip on reclose (TOR)
Inhibit switch onto fault (SOTF)
To enable SOTF logic by an external pulse. When this input is energized by en external pulse, SOTF becomes enabled during “SOTF
Pulse” time setting
AR reset Z1X reach back to Z1 reach in Z1 extension scheme
Reset zone Z1X back to Z1 reach using logic input (i.e. case when external AR and Z1 extension scheme are used)
Inhibit Loss of Load scheme function
Aided 1 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 1 - external signal received, for input to distance fixed scheme logic
Aided channel 1 - internal signal received generated in the signal receive logic
Prevent sending by customized logic - aided scheme 1
Programmable send logic for special customized scheme (aided channel 1)
Aided channel 1 send - internal send signal generated in signal send logic
DDB_AIDED1_CUSTOM_TIMER_IN
When using a custom programmable aided scheme 1, the user is able to include a current reversal guard timer. Energizing this DDB
will additionally start this timer, from PSL
DDB_AIDED1_CUSTOM_TIMER_OUT
When using customized aided scheme 1, 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 1 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_AIDED1_CUSTOM_TRIP_ENABLE
Aided scheme 1 distance trip command (output from aided tripping logic)
Aided Scheme 1 Delta Directional Trip command (output from Aided tripping logic)
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