Rockwell Automation 865 Differential Protection Relay - Manual (Page 109)

Supporting Functions 4-17
865-UM001A-EN-P – July 2009
Table 4.12 – Line Fault Parameters (cont.)
Parameter Value Unit Description Note
LxTrip
On
Off
‘On’ Event enabling for FltL1…3
Events are enabled
Events are disabled Set
LxTripOff
On
Off
‘Off’ Event enabling for FltL1…3
Events are enabled
Events are disabled Set
OCTrip
On
Off
‘On’ Event enabling for combined o/c
trips
Events are enabled
Events are disabled Set
OCTripOff
On
Off
'Off' Event enabling for combined o/c
starts
Events are enabled
Events are disabled Set
IncFltEvnt
On
Off
Disabling several events of the same
fault
Several events are enabled
Several events of an increasing fault is
disabled Set
ClrDly 0 ...
65535
s Duration for active alarm status FltL1,
Flt2, FltL3 and OCt Set
Set = An editable parameter (password needed)
Used with IEC 60870-105-103 communication protocol. The alarm screen will show
the latest if it's the biggest registered fault current, too. Not used with Spabus,
because Spabus masters usually don't like to have unpaired On/Off events.
Used with SPA-bus protocol, because most SPA-bus masters do need an off-event for
each corresponding on-event.
Self-Supervision The functions of the micro controller and the associated circuitry, as
well as the program execution are supervised by means of a separate
watchdog circuit. Besides supervising the relay, the watchdog circuit
attempts to restart the micro controller in a fault situation. If the
restarting fails, the watchdog issues a self-supervision alarm
indicating a permanent internal fault.
When the watchdog circuit detects a permanent fault, it always
blocks any control of other output relays (except for the self-
supervision output relay).
In addition, the internal supply voltages are supervised. Should the
auxiliary supply of the relay disappear, an alarm is automatically
given because the internal fault (IF) output relay functions on a
working current principle. This means that the IF relay is energized
when the auxiliary supply is on and no internal fault is detected.