43
Latching and non-latching targets
A latching operation target message remains on the display until manually cleared or
until replaced by a message of higher priority. However, if the fault is stable and has
not disappeared, the operation target message and the LED(s) are not cleared. An
operation target generated by a non-latching pickup is automatically cleared when
the element is reset.
Priority of operation target messages
The messages on the display have a certain priority order. If different types of targets
are activated simultaneously, the message with the highest priority appears on the
display.
The priority order of the messages:
1. CBFAIL/Trip from Arc protection
2. CB Reclosing Failed
3. Trip/Definite Trip Alarm
4. Pickup/Alarm/Shot Due/AR Lockout
When several protection elements generate pickups, the last pickup/alarm target
message is displayed. When several protection elements trip, the first trip target
message is displayed until the time, as specified by the
NEW TRIP IND.
setting
value, has expired. After this, a new trip target message can replace the old one. A
hidden trip target message can be brought forward by pressing
.
4.3.2.2.
Disturbance recorder target
When the display is in the idle mode, an asterisk
“
*
”
indicating that the disturbance
recorder has been triggered and is ready to be unloaded, is shown in the lower right-
hand corner of the display. Disturbance recorder status target can also be routed to
the programmable LEDs.
4.3.2.3.
Self-supervision
There are two types of fault targets; internal relay fault (IRF) targets and warnings.
Internal relay faults prevent relay operation. Warnings are less severe faults and
continued relay operation with full or reduced functionality is allowed.
Internal relay fault (IRF)
At permanent internal relay faults, the relay is no longer protecting and has to be
sent for repair at an authorized service supplier. When the self-supervision system
detects a permanent internal relay fault, the green target LED starts to flash. The text
INTERNAL FAULT
and a fault code appear on the display.
State the fault code when sending the relay for service.
Feeder Protection Relay
Operator's Manual - ANSI Version
REF 610
REF 610
1MRS755539
