Appendix B - Settings and Signals
ORDINAL SIGNAL NAME ELEMENT NAME
DESCRIPTION
Loopback test in service (external or internal)
Indication that relay is in test mode
CTS indication alarm (CT supervision alarm)
DDB_REMOTE_CTS_INDICATION
CTS remote indication alarm (CT supervision alarm)
Circuit breaker fail alarm
This alarm indicates that DDB CB I^ Maint (1106) or DDB CB OPs Maint. (1108) or DDB CB Time Maint. (1110)
This alarm indicates that DDB CB I^ Lockout (1107) or DDB CB Ops Lock (1109) or DDB CB Time lockout (1111)
CB Status Alarm - set when CB status is determined by inputs from BOTH 52A and 52B type auxiliary contacts (setting "CB 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
CB Failed to Trip - alarm set if CB does not trip within set Trip Pulse Time when CB trip command is issued.
CB Failed to Close - alarm set if CB fails to close within set Close Pulse Time when CB close command is issued
ManCB1 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
No C/S Man Close - 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 "Check Sync Time").
A/R Lockout - alarm set when CB autoreclose is locked out.
A/R CB Unhealthy - alarm set if CB remains "unhealthy" for Autoreclose set time "CB Healthy Time" when CB close sequence is initiated by
autoreclose function. (Please see description for Autoreclose setting "CB Healthy Time").
A/R No Checksync - alarm set if selected system check conditions for autoreclosing CB remain unsatisfied for Autoreclose set time "Check
Sync Time" when CB close sequence is initiated by autoreclose function. (Please see description for Autoreclose setting "Check Sync Time").
If a differential protection communication path has remained failed for a period which is longer than the “Comms Fail Timer”, this alarm is
ON
DDB_PROPAGATION_DELAY_FAILURE
If successive calculated propagation delay times exceed time delay setting “Comm Delay Tol”, this alarms is ON
It indicates that differential protection communications are completely lost and therefore C diff does not work
It indicates that communications between relays are completely lost and therefore IM64 does not work
It 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
DDB_INHIBIT_CD_PROTECTION
Indicate that a differential protection has been inhibited
Frequency out of range alarm
Indicates a failure with the Co-Processor, this will affect the protections that run on this board, eg. current differential, phase comparision,
distance and DEF Protections.
In three ended schemes on power up, the relays check to see if one of them should be configured out. Under some circumstances it is
To Next Page
Loading...
