Self-Supervision - ABB RELION REX640 Technical Manual

1MRS759142 C
3.3
REX640
Technical Manual

Self-supervision

The protection relay's extensive self-supervision system continuously supervises the
software and the electronics. It handles the run-time fault situation and informs the
user about a fault via the LHMI, the relay's main unit power module Ready LED and
through the communication channels.
There are two types of fault indications.
• Internal faults
• Warnings
On the LHMI, the self-supervision status is available as an advanced page under Relay
Status page. The self-supervision status is indicated with Internal Fault, Warning and
All OK LEDs. In normal operation, All OK LED is lit.
GUID-C2262ADD-640C-4F59-B584-BE03A1C43F95 V1 EN
Figure 18: Relay self-supervision status on local HMI
On the WHMI, the self-supervision status is available under Device menu. The top
right LED indicates the relay status.
Section 3
Basic functions
97