Protection Relay Targets; Target Leds; Green Target Led - ABB REU 610 Operator's Manual

1MRS755971
4.3.
4.3.1.
4.3.1.1.
Voltage 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 pickups 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 pickup 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.
REU 610
A040264
37