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Name
Values (Range)
Unit
Step
Default
Description
K1
1.0 - 99.0
s
0.1
10.0
Neg. seq. capability value of generator for step
1, in sec
t1Min
0.000 - 60.000
s
0.001
5.000
Minimum trip time for inverse delay of step 1, in
sec
t1Max
0.00 - 6000.00
s
0.01
1000.00
Maximum trip delay for step 1, in sec
ResetMultip1
0.01 - 20.00
-
0.01
1.00
Reset multiplier for K1, defines reset time of
inverse curve
OpStep2
Disabled
Enabled
-
-
Enabled
Enable execution of step 2
I2-2>
3 - 500
%IB
1
10
Step 2 Neg. Seq. Current pickup level, in % of
IBase
t2
0.00 - 6000.00
s
0.01
10.00
Definite time delay for trip of step 2, in sec
tResetDef2
0.000 - 60.000
s
0.001
0.000
Time delay for reset of definite timer of step 2,
in sec
Table 144:
NS2PTOC (46I2) Non group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
GlobalBaseSel
1 - 6
-
1
1
Selection of one of the Global Base Value
groups
8.9.6
Monitored data
Table 145:
NS2PTOC (46I2) Monitored data
Name
Type
Values (Range)
Unit
Description
NSCURR
REAL
-
A
Negative sequence current in
primary amps
8.9.7
Operation principle
The negative sequence time overcurrent protection for machines (NS2PTOC, 46I2)
function directly measures the amplitude of the negative phase sequence component of the
measured current. NS2PTOC (46I2) sets the PICKUP, PU_ST1 or PU_ST2 outputs active
and starts to count trip time only when the measured negative sequence current value rises
above the set value of parameters
I2-1>
or
I2-2>
respectively.
To avoid oscillation in the output signals, a certain hysteresis has been included. For both
steps, the reset ratio is 0.97.
Step 1 of NS2PTOC (46I2) can operate in the Definite Time (DT) or Inverse Time (IDMT)
mode depending on the selected value for the
CurveType1
parameter. If
CurveType
1=
Definite
, NS2PTOC (46I2) operates with a Definite Time Delay characteristic and if
Section 8
1MRK 502 048-UUS A
Current protection
268
Technical manual
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