3.2
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
•
Warnings
3.2.1
Internal faults
When an internal relay fault is detected, the green Normal LED begins to flash and the
self-supervision output contact is activated.
Internal fault indications have the highest priority on the LHMI. None of
the other LHMI indications can override the internal fault indication.
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 contacts are released and locked for
the internal fault. The protection relay continues to perform internal tests during the fault
situation.
If an internal fault disappears, the green Normal LED stops flashing and the protection
relay returns to the normal service state. The fault indication message remains on the
display until manually cleared.
The self-supervision signal output operates on the closed-circuit principle. Under normal
conditions, the protection relay is energized and the contact gaps 3-5 in slot X100 is
closed. If the auxiliary power supply fails or an internal fault is detected, the contact gaps
3-5 are opened.
Section 3
1MAC059074-MB A
Basic functions
70
615 series ANSI
Technical Manual
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