4 Protective Elements
4.1
Protection (Prot) Module
The module »Module General Protection« (»Prot«) serves as the outer frame for all other
protection modules (i. e.: they are all enclosed by this module).
Prot – Active
GeneralProt_E91
1
Prot . Active
Prot . Available
At the moment, no parameter is being changed (except parameter set parameters).
Measured Values: OK
AND
Each protection element generates its own pickup and trip signals. Unless there is a
setting »Alarm only« = “Yes” these are automatically passed onto the »Prot« module
where the phase-specic and the general (collective) pickup and trip signals are
generated. The »Prot« module serves as a top level and a common place to group all
pickups and trips from each individual protection element.
For instance, »Prot . Pickup« is the collective pickup signal OR-ed from all protection
elements; »Prot . Trip« is the collective Trip signal OR-ed from all protection elements, etc.
Every protective element features a setting
»Alarm only« (in the menu branch [Device
Planning]). The alarms and trip decisions of this protective element are passed on
to »Prot« only with the setting »Alarm only« = “No”.
If »Alarm only« = “Yes” then the module works as a supervision element: Alarms and trip
decisions are kept as element-specic states (i. e. these states can be checked at the
menu branch [Operation / Status Display] and can be assigned as select options), but
these do not result in a General Alarm or General Trip, and as a consequence, no Breaker
is opened.
If a protection element is activated and if it decides to trip then signals are issued as
follows:
• The module or the protection element issues a pickup/alarm and a trip
(e. g.: »50P[1] . Pickup« or »50P[1] . Trip«).
These are always issued, independently of the setting »Alarm only«.
• If »Alarm only« has been set to “No” then the master module »Prot« collects/
summarizes these signals and issues its own collective signals: »Prot .
Pickup« / »Prot . Trip«.
134 www.eaton.com EMR-3MP0
4 Protective Elements
4.1 Protection (Prot) Module
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