phase to earth and phase to phase to earth) at different switching states in the
network.
t3I0: Time delay for trip in case of high zero sequence 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.
16.8.11 Three phase overcurrent LCP3PTOC
GUID-510F1FCE-39ED-4B44-89D0-338B085DD8C3 v1
16.8.11.1 Identification
GUID-5FBC4309-C8FB-4CDF-A4D6-84E3A89C81B7 v1
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Three phase overcurrent
LCP3PTOC - 51
16.8.11.2 Application
GUID-EFA9F558-B4DA-4DA3-AA49-9139EC4C23FD v1
Three phase overcurrent (LCP3PTOC) is designed for detecting over current
conditions due to fault or any other abnormality in the system.
LCP3PTOC could be used as a back up for other local criterion checks.
16.8.11.3 Setting guidelines
GUID-BEC224BD-F45D-4D42-8287-D9D9F4AB3D7B v2
GlobalBaseSel: Selects the global base value group used by the function to define
IBase, UBase and SBase as applicable.
IOC>: Level of high phase current detection given in % of IBase. This setting can
be based on evaluation of the largest current that can occur during non-faulted
network operation: I
loadmax
. Fault calculations where the smallest current at
relevant faults gives: I
faultmin
. The setting can be chosen: I
loadmax
<IOC> <I
faultmin
tOC: Time delay for trip in case of high 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.
16.8.12 Three phase undercurrent LCP3PTUC
GUID-E8EAE24D-4B69-43DC-BCFC-C4AC63AA66AB v1
1MRK 506 369-UEN B Section 16
Scheme communication
Line distance protection REL670 2.2 IEC 739
Application manual
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