Self-Supervision; Internal Faults - ABB RELION REC615 Technical Manual

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Table of Contents

1MRS758755 C

Table 24: COM1/2 serial communication settings

Values (Range)

2=Fiber optic

1=RS485 2Wire

2=RS485 4Wire

3=RS232 no hand-

4=RS232 with hand-

Self-supervision

The protection relay's extensive self-supervision system continuously supervises the

software and the electronics. It handles run-time fault situation and informs the

user about a fault via the LHMI and through the communication channels.

There are two types of fault indications.

Internal faults

When an internal relay fault is detected, relay protection operation is disabled,

the green Ready LED begins to flash and the self-supervision output contact is

An indication about the fault is shown as a message on the LHMI. The text

Internal Fault with an additional text message, a code, date and time, is shown

to indicate the fault type.

Different actions are taken depending on the severity of the fault. The protection

relay tries to eliminate the fault by restarting. After the fault is found to be

permanent, the protection relay stays in the internal fault mode. All other output

REC615 & RER615

Technical Manual

Internal fault indications have the highest priority on the LHMI. None of

the other LHMI indications can override the internal fault indication.

1=RS485 2Wire

Basic functions

Relion rer615