Protection Relay Indications - ABB REU 610 Operator's Manual

REU 610 REU 610
4.3.
4.3.1.
4.3.1.1.
38
Voltage Protection Relay
Operator's Manual
include recorded data, disturbance recorder data and average values (demand
values and history data).

Protection relay indications

The operation of the relay can be monitored by means of three different HMI
indications:
Three indicator LEDs with fixed functionality:
*
Ready
*
Start/Alarm
*
Trip
*
Eight programmable indicator LEDs
*
Text message on the display
*
The protection functions are not affected by fault indications.
Indicator LEDs
When a protection stage starts or generates an alarm, the yellow indicator LED is lit.
When a protection stage trips, the yellow indicator LED remains lit and the red
indicator LED is lit.
When a starting protection stage is blocked, the yellow indicator LED starts to flash.
The yellow indicator LED is also lit to indicate an alarm from a protection stage.
Green indicator LED
Fig. 4.3.1.1.-1 Green indicator LED
Two different functions are embedded in the green indicator LED: power on and
internal relay fault (IRF).
Indicator off:
*
The auxiliary voltage is not connected.
Lit indicator:
*
The relay is in operation. However, a less severe fault (warning) may have
occurred. Refer to Section 4.3.2.3. Self-supervision.
Flashing indicator:
*
An internal relay fault requiring repair by an authorized service supplier has
occurred. Refer to Section 4.3.2.3. Self-supervision.
1MRS755770
A040264