3.2 Self-supervision
The IED'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 communications channels.
There are two types of fault indications.
• Internal faults
• Warnings
3.2.1 Internal faults
When an IED internal fault is detected, IED protection operation is disabled, the
green Ready 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 IED tries to
eliminate the fault by restarting. After the fault is found to be permanent, the IED
stays in the internal fault mode. All other output contacts are released and locked
for the internal fault. The IED continues to perform internal tests during the fault
situation.
If an internal fault disappears, the green Ready LED stops flashing and the IED
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 IED 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.
1YHT530004D05 D Section 3
Basic functions
615 series 59
Technical Manual
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