HAC319AEV1 ABB distributed control system industrial DCS module card

Description

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The zone selectivity, which is applicable to protection functions S and G, can be enabled in the case where the curve with
fixed time is selected and the auxiliary power supply is present.
This type of selectivity allows shorter trip times for the circuitbreaker closest to the fault than in the case of time-selectivity.
It is a type of selectivity suitable for radial nets.
The word zone is used to refer to the part of an installation between two circuit-breakers in series. The fault zone is the zone
immediately on the load side of the circuit-breaker that detects
the fault. Each circuit-breaker that detects a fault communicates
this to the circuit-breaker on the supply side by using a simple
communication wire. The circuit-breaker that does not receive
any communication from those on the load side will launch the
opening command within the set selectivity time (40÷200ms).
We have to consider that the circuit-breakers receiving a signal
from another trip unit will operate according to the set time t2.
If, for any reason, after the selectivity time, the circuit-breaker
due to trip has not opened yet, it lets the “block signal” fall on
the other circuit-breaker, which will trip.