Setting Guidelines - ABB RELION 670 Series Applications Manual

1MRK 504 152-UEN B
Start signal from
remote side
IEC11000232 V3 EN-US
Figure 54: Local release criterion configuration for line differential protection
6.4.3

Setting guidelines

GlobalBaseSel : Selects the global base value group used by the function to define ( IBase ),
UBase ) and ( SBase ).
(
tStUpReset : Reset delay of the startup signal. The default value is recommended.
Settings for phase-phase current variation subfunction are described below.
OperationCV : On / Off , is set On in most applications
ICV> : Level of fixed threshold given in % of IBase . This setting should be based on fault
calculations to find the current increase in case of a fault at the point on the protected line
giving the smallest fault current to the protection. The phase current shall be calculated for
different types of faults (single phase-to-earth, phase-to-phase to earth, phase-to-phase and
three phase short circuits) at different switching states in the network. In case of switching of
large objects (shunt capacitor banks, transformers, and so on) large change in current can
occur. The
tCV : Time delay of zero sequence overcurrent criterion. Default value 0.002 s is recommended
Settings for zero sequence current criterion subfunction are described below.
Operation3I0 : On / Off , is set On for detection of phase-to-earth faults with high sensitivity
3I0> : Level of high zero sequence current detection given in % of IBase . This setting should be
based on fault calculations to find the zero sequence current in case of a fault at the point on
the protected line giving the smallest fault current to the protection. The zero sequence
current shall be calculated for different types of faults (single phase-to-earthand phase to
phase to earth) at different switching states in the network.
t3I0 : Time delay of zero sequence overcurrent criterion. Default value 0.0 s is recommended
Setting for low voltage criterion subfunction are described below.
OperationUV : On / Off , is set On for detection of faults by means of low phase-to-earth or
phase-to-phase voltage
UPhN< : Level of low phase-earth voltage detection, given in % of UBase . This setting should be
based on fault calculations to find the phase-earth voltage decrease in case of a fault at the
Application manual
LDLPSCH
CTFAIL TRIP
OUTSERV TRL1
BLOCK TRL2
TRL3
TRLOCAL
TRLOCL1
TRLOCL2
TRLOCL3
TRREMOTE
DIFLBLKD
LDRGFC
I3P* START
U3P* STCVL1L2
BLOCK STCVL2L3
BLKCV STCVL3L1
BLKUC STUC
BLK3I0 ST3I0
BLKUV STUV
REMSTUP
ICV> setting should ensure that all multi-phase faults are detected.
AND
INPUT1 OUT
INPUT2 NOUT
INPUT3
INPUT4N
Start signal to
remote side
IEC11000232-3-en.vsd
Section 6
Differential protection
Release of line
differential
protection trip
GUID-3C315FA5-8262-416D-A8ED-927FE0BFAB8F v3
143