Four Step Directional Negative Phase Sequence Overcurrent Protection Ns4Ptoc (46I2) - ABB RELION 670 Series Applications Manual

Section 8
Current protection
The function is divided into two parts. The SOTF function will give operation from step 2 or 3
during a set time after change in the position of the circuit breaker. The SOTF function has a set
time delay. The Under Time function, which has 2
from step 4. The 2nd harmonic restrain will prevent unwanted function in case of transformer
inrush current. The Under Time function has a set time delay.
Below the settings for switch on to fault logics are described.
SOTF operation mode : This parameter can be set: Disabled/SOTF/Under Time/SOTF+Under Time .
SOTFSel : This setting will select the signal to activate SOTF function; CB position open/CB
position closed/CB close command .
tSOTF : Time delay for operation of the SOTF function. The setting range is 0.000 - 60.000 s in step
of 0.001 s. The default setting is 0.100 s
StepForSOTF : If this parameter is set on the step 3 pickup signal will be used as current set level. If
set disabled step 2 pickup signal will be used as current set level.
t4U : Time interval when the SOTF function is active after breaker closing. The setting range is
0.000 - 60.000 s in step of 0.001 s. The default setting is 1.000 s.
ActUndrTimeSel : Describes the mode to activate the sensitive undertime function. The function
can be activated by Circuit breaker position (change) or Circuit breaker command.
tUnderTime : Time delay for operation of the sensitive undertime function. The setting range is
0.000 - 60.000 s in step of 0.001 s. The default setting is 0.300 s
8.3 Four step directional negative phase sequence
overcurrent protection NS4PTOC (46I2)
8.3.1 Identification
Function description
Four step negative sequence
overcurrent protection
8.3.2 Application
Four step negative sequence overcurrent protection NS4PTOC (4612) is used in several
applications in the power system. Some applications are:
120
nd
harmonic restrain blocking, will give operation
IEC 61850 IEC 60617
identification identification
NS4PTOC
I2
4
alt
4
IEC10000053 V1 EN-US
1MRK 511 364-UUS A
GUID-E8CF8AA2-AF54-4FD1-A379-3E55DCA2FA3A v1
GUID-E1720ADA-7F80-4F2C-82A1-EF2C9EF6A4B4 v1
ANSI/IEEE C37.2
device number
46I2
GUID-343023F8-AFE3-41C2-8440-1779DD7F5621 v2
Application manual