Appendix B -Settings and Signals
ORDINAL SIGNAL NAME ELEMENT NAME
DESCRIPTION
cross polarization to allow testing with test sets that can not simulate a real fault
Loopback test in service (external or internal)
Indication that relay is in test mode
VTS indication alarm- failed VT (fuse blow) detected by VT supervision
CT1S indication alarm (CT supervision alarm)
In the cases of two CTs:
- If standard CTS is used, this indication is ON in case of failure on any of the CTs
- If Diff CTS is used this indication is ON in case of failure on CT1
CT2S indication alarm (CT supervision alarm).
This indication is ON If Diff CTS is used and there is a failure on CT2
Powerswing blocking will block any distance zone selected in the setting file
Circuit breaker (CB1) fail alarm
CB1 Monitor Lockout Alarm
CB1 Status Alarm - set when CB1 status is determined by inputs from BOTH 52A and 52B type auxiliary contacts (setting "CB1 Status
Input = 52A&52B-xPole), and both inputs are in the same state (both = 0 or both = 1) for time period => 5sec, indicating a problem with
the auxiliary switch mechanism).
CB1 Failed to Trip - alarm set if CB1 does not trip within set Trip Pulse Time when CB1 trip command is issued.
CB1 Failed to Close - alarm set if CB1 fails to close within set Close Pulse Time when CB1 close command is issued
Control CB1 Unhealthy - alarm set if CB1 remains "unhealthy" for CB Control set time "CB Healthy Time" when operator controlled CB1
close sequence is initiated. (Please see description for CB Control setting "CB Healthy Time").
DDB_CONTROL_NO_CHECK_SYNC
Control No Checksync - alarm set if selected system check conditions for manual closing CB1 remain unsatisfied for CB Control set
time "Check Sync Time" when operator controlled CB1 close sequence is initiated. (Please see description for CB Control setting
Autoclose Lockout/RLY BAR - alarm set when CB1 autoreclose is locked out.
No Healthy (AR) - alarm set if CB1 remains "unhealthy" for Autoreclose set time "CB Healthy Time" when CB1 close sequence is
initiated by autoreclose function. (Please see description for Autoreclose setting "CB Healthy Time").
No Check Sync / AR Fail - alarm set if selected system check conditions for autoreclosing CB1 remain unsatisfied for Autoreclose set
time "Check Sync Time" when CB1 close sequence is initiated by autoreclose function. (Please see description for Autoreclose setting
If a differential protection communication path has remained failed for a period which is longer than the “Comms Fail Timer”, this
alarm is ON
It indicates that communications between relays are completely lost and therefore IM64 does not work
t will appear in case of at least one of the following: CH1 (or CH2) loss of signal, CH1 (or CH2) PATH_YELLOW or CH1 (or CH2) BAD_RX_N
Aided channel scheme 1 - channel out of service indication, indicating channel failure
Aided channel scheme 2 - channel out of service indication, indicating channel failure
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