16.8.12.1 Identification
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Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Three phase undercurrent
LCP3PTUC - 37
16.8.12.2 Application
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Three phase undercurrent protection function (LCP3PTUC) is designed for
detecting loss of load conditions.
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.
16.8.12.3 Setting guidelines
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GlobalBaseSel: Selects the global base value group used by the function to define
IBase, UBase and SBase as applicable.
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 16 1MRK 506 369-UEN B
Scheme communication
740 Line distance protection REL670 2.2 IEC
Application manual
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