1MRS755539
4.3.
4.3.1.
4.3.1.1.
Feeder Protection Relay
Operator's Manual - ANSI Version
Protection relay targets
The operation of the relay can be monitored by means of three different HMI
targets:
Three target LEDs with fixed functionality:
*
Ready
*
Pickup/Alarm
*
Trip
*
Eight programmable target LEDs
*
Text message on the display
*
The protection functions are not affected by fault targets.
Target LEDs
When a protection element picks up or generates an alarm, the yellow target LED is
lit.
When a protection element trips, the yellow target LED remains lit and the red target
LED is lit.
When a picked up protection element is blocked, the yellow target LED starts to
flash. The yellow target LED is also lit to indicate an alarm from a protection
element.
Green target LED
Fig. 4.3.1.1.-1
Green target LED
Two different functions are embedded in the green target LED: power on and
internal relay fault (IRF).
Target off:
*
The auxiliary voltage is not connected.
Lit target:
*
The relay is in operation. However, a less severe fault (warning) may have
occurred. Refer to Section 4.3.2.3. Self-supervision.
Flashing target:
*
An internal relay fault requiring repair by an authorized service supplier has
occurred. Refer to Section 4.3.2.3. Self-supervision.
REF 610
REF 610
A040264
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