GCD207B101 ABB distributed control system industrial DCS module card

Description

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PR123/P can store an alternative set of all the protection parameters. This second set (set B) can
replace, when needed, the default set (set A) by means of an external command. The command
can be given typically when network configuration is modified, like when a parallel of incoming
lines is closed or when an emergency source is present in the system, changing load capability
and short-circuit levels.
The set B can be activated by:
– digital input provided with PR120/K module. For example It can be connected to an auxiliary
contact of a bus-tie
– communication network, through PR120/D-M (i.e. when the changeover is scheduled);
– directly from user interface of PR123/P
– an adjustable time internal after closing of the circuit-breaker.
Zone selectivity function
The zone selectivity function allows the fault area to be insulated by segregating the system very
rapidly only at the level closest to the fault, whilst leaving the rest of the installation running.
This is done by connecting the trip units together: the trip unit nearest the fault is tripped instantly,
sending a block signal to the other trip units affected by the same fault
The zone selectivity function can be enabled if the fixed-time curve has been selected and an
auxiliary power supply is present.
Zone selectivity can be applied with protections S and G or, alternatively, with protection D.