GCC960C103 ABB distributed control system industrial DCS module card

Description

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Double selective short-circuit protection S
In addition to the standard S protection, PR123/P makes contemporarily available a second
time-constant S protection (excludible) that allows two thresholds to be set independently achieving
an accurate selectivity even under highly critical conditions.
Double earth fault protection G
While in PR122/P the user must choose among the implementation of G protection through
internal current sensors (calculating the vectorial sum of currents) or external toroid (direct
earth fault current measuring), PR123/P offers the exclusive feature of the contemporaneous
management of both the configuration, by means of two independent earth fault protections
curves. The main application of this characteristic is simultaneous activation of restricted and
unrestricted earth fault protection. See chapter 6 for details.
Directional short-circuit protection with adjustable delay D
The protection works in a similar way to the fixed-time protection “S”, with the added ability to
recognize the direction of the phases current during the fault period.
The current direction makes it possible to determine whether the fault is on the supply or load
side of the circuit-breaker. Particularly in ring distribution systems, this makes it possible to identify and disconnect the distribution segment where the fault has occurred, whilst keeping the rest
of the installation running. If multiple PR123 trip units are used, this protection can be associated
with zone selectivity.
Residual current protection Rc
With PR123/P is possible to have the residual current protection only adding the external toroid
(1SDA063869).
P