Self-Supervision (Irf); I/O Test; Disturbance Recorder; Function - ABB REU 523 Technical Reference Manual

1MRS 750942-MUM
4.1.5.
4.1.6.
4.1.7.
4.1.7.1.
ABB Automation
Combined Overvoltage and Undervoltage Relay
Technical Reference Manual

Self-supervision (IRF)

The relay is provided with an extensive self-supervision system that continuously
supervises the software and the electronics of the relay. It handles run-time fault
situations and informs the user about an existing fault via a LED on the MMI.
When a fault is detected, the relay first tries to eliminate it by restarting. Only after
the fault is found to be permanent, the green READY indicator starts to blink and
the protection relay delivers a fault signal to the self-supervision output contact.
Additionally, a fault indication text appears on the LCD.
The fault indication has the highest priority on the MMI. None of the other MMI
indications can override the IRF indication. When the display panel has received a
fault indication, the indication text remains on the LCD. As long as the green LED
is blinking, the fault indication or the green LED can not be turned off. In case an
internal fault disappears, the fault indication text remains on the display. The green
READY indicator stops blinking and the alarm output IRF is released to normal
service state.
The IRF code is the code of the latest internal fault detected by the self-supervision
system. It describes the type of the fault. When a fault appears, the code is to be
recorded and given to an authorised repair shop when overhaul is ordered. For fault
codes, refer to section "Internal fault" in "Operator's Manual".

I/O test

The I/O test is used for testing the configuration as well as the connections to and
from the relay. Running this test enables monitoring the state of the binary input as
well as activating and testing the eight internal signals from the protection stages and
the IRF output one by one. Provided that the internal signals from the protection
stages have been set to be routed to the output contacts (PO1, PO2, SO1 and SO2)
with the switches of SGR1...8, the output contacts are activated and the
corresponding event codes generated when the I/O test is run. The test mode is
entered via "Function test/BI" in MMI menu; refer to "Operator's Manual".

Disturbance recorder

Function

The relay features an integrated disturbance recorder for recording monitored
quantities. The recorder captures continuously curve forms of the voltages as well
as the external binary input signal and states of the internal protection stages, and
stores these in the volatile memory.
When the recorder is triggered, the post-triggering recording starts. If the post-
triggering recording length has been defined to be less than the total recording length
of 40 cycles, a part of the history recording, preceding the triggering, also remains
in the memory to fill the total recording length. When the post-triggering recording
has finished, a complete recording has been created and stored in the memory.
As soon as the recorder has been triggered and the recording finished, the recording
can be unloaded and verified by means of a personal computer with a special
program.
REU 523
29