Eaton EMR-3MP0 - Self-Supervision; Self-Supervision within the devices

7 Self-Supervision
The protection devices are supervised by various check routines during normal operation
and during the start-up phase on faulty operation.
The protection devices are carrying out various self-supervision tests.
Self-Supervision within the devices
Supervision of... Supervised by... Action on detected issue...
Start phase The duration (permitted time)
of the boot phase is monitored.
The device will be rebooted.
⇨ The device will be taken out
of service after three
unsuccessful start attempts.
Supervision of the duration of a
protection cycle (Software
cycle)
The maximum permitted time
for a protection cycle is
monitored by a timing analysis.
The self-supervision contact will
be deenergized if the permitted
time for a protection cycle is
exceeded (󰊎rst threshold).
The protection device will be
rebooted, if the protection cycle
exceeds the second threshold.
Monitoring of the
communication between Main
and Digital Signal Processor
(DSP)
The cyclic measured value
processing of the DSP is
monitored by the main
processor.
The device will be rebooted, if a
failure is detected.
The self-supervision contact will
be de-energized.
Analog-Digital-Converter The DSP does a plausibility
check on the digitalized data.
Protection will be blocked, if a
failure is detected, in order to
prevent faulty tripping.
Supervision of data consistency
after an outage of the power
supply.
(e. g. outage of the power
supply while changing the
parameter settings).
An internal logic detects
fragmentary saved data after
an outage of the power supply.
If the new data is incomplete or
corrupt, it will be deleted during
the reboot phase of the device.
The device will continue to work
with the last valid data set.
Data consistency in general Generation of check-sums. The device will be taken out of
service in case that inconsistent
data is detected that is not
caused by an outage of the
power supply.
(fatal internal error).
Parameter Setting (Device) Protecting the parameter
setting by plausibility checks.
Implausibilities within the
parameter con󰊎guration can be
218 www.eaton.com EMR-3MP0
7 Self-Supervision