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26
Setting group selector (GRP)
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Different conditions in networks of different voltage levels require high adaptability of
the used protection and control units to best provide for dependability, security and se-
lectivity requirements. Protection units operate with higher degree of availability, espe-
cially, if the setting values of their parameters are continuously optimised regarding the
conditions in power system.
The operational departments can plan different operating conditions for the primary
equipment. The protection engineer can prepare in advance for the necessary optimised
and pre-tested settings for different protection functions. Four different groups of set-
ting parameters are available in the REx 5xx terminals. Any of them can be activated
automatically through up to four different programmable binary inputs by means of ex-
ternal control signals.
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Select a setting group by using the local HMI, from a front connected personal comput-
er, remotely from the station control or station monitoring system or by activating the
corresponding input to the GRP function block.
Each input of the function block is configurable to any of the binary inputs in the ter-
minal. Configuration must be performed by using the CAP configuration tool.
Use external control signals to activate a suitable setting group when adaptive function-
ality is necessary. Input signals that should activate setting groups must be either per-
manent or a pulse longer than 200 ms.
More than one input may be activated simultaneously. In such cases the lower order set-
ting group has priority. This means that if for example both group four and group two
are set to activate, group two will be the one activated.
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