When the transformer or shunt reactor differential operates and the secondary side circuit
breaker is tripped there will be very low current from this end of the line to the remote end.
LCP3PTUC detects the above low current condition by monitoring the current and helps to trip
the circuit breaker at this end instantaneously or after a time delay according to the
requirement.
15.8.12.3
Setting guidelines
GUID-8A4C4842-F9DB-4B44-8114-DCEE18CC6E59 v2
GlobalBaseSel: Selects the global base value group used by the function to define (IBase),
(
UBase) and (SBase).
IUC<: Level of low phase current detection given in % of IBase. This setting is highly depending
on the application and therefore can no general rules be given.
tUC: Time delay for trip in case of low phase current detection. The trip function can be used
as stand alone short circuit protection with a long time delay. The choice of time delay is
depending on the application of the protection as well as network topology.
Section 15
1MRK 505 343-UEN B
Scheme communication
632
Application manual
Содержание Relion 670 series
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