Name Values (Range) Unit Step Default Description
tPRCrv4 0.005 - 3.000 - 0.001 0.500 Param PR for customized inverse reset
time curve for step 4
tTRCrv4 0.005 - 100.000 - 0.001 13.500 Param TR for customized inverse reset
time curve for step 4
tCRCrv4 0.1 - 10.0 - 0.1 1.0 Param CR for customized inverse reset
time curve for step 4
Table 239: NS4PTOC (46I2) Non group settings (basic)
Name Values (Range) Unit Step Default Description
GlobalBaseSel 1 - 12 - 1 1 Selection of one of the Global Base Value
groups
8.5.6 Monitored data
PID-6530-MONITOREDDATA v3
Table 240: NS4PTOC (46I2) Monitored data
Name Type Values (Range) Unit Description
IOp REAL - A Operating current level
VPol REAL - kV Polarizing voltage level
VPOLIANG REAL - deg Polarizing angle between voltage and
current
8.5.7 Operation principle
GUID-8923EC0B-A5BA-431B-9699-EB67E2637560 v3
Four step negative sequence overcurrent protection NS4PTOC (4612) function has the following
three “Analog Inputs” on its function block in the configuration tool:
1. I3P, input used for “Operating Quantity”.
2. V3P, input used for “Polarizing Quantity”.
3. I3PDIR, input used for "Directional finding"
These inputs are connected from the corresponding pre-processing function blocks in the
Configuration Tool within PCM600.
8.5.7.1 Operating quantity within the function
GUID-8F0A5BDE-AC98-4188-9085-42A8DF00C476 v3
Four step negative sequence overcurrent protection NS4PTOC (46I2) function always uses
negative sequence current (I2) for its operating quantity. The negative sequence current is
calculated from three-phase current input within the IED. The pre-processing block calculates I2
from the first three inputs into the pre-processing block by using the following formula:
( )
2
1
2
3
I IA a IB a IC= × + × + ×
ANSIEQUATION2266 V1 EN-US
(Equation 132)
Section 8 1MRK 502 066-UUS B
Current protection
498
Technical manual
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