ABB Relion REG670, Technical Manual, Page: 444 / 1298

Name Values (Range) Unit Step Default Description
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 Off
On
- - On Enable execution of step 2
I2-2> 3 - 500 %IB 1 10 Negative sequence current level for step 2
in % of IBase
CurveType2 Definite
Inverse
- - Definite Selection of definite or inverse time-
characteri. for step 2
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
K2 1.0 - 99.0 s 0.1 10.0 Neg. seq. capability value of generator for
step 2, in sec
t2Min 0.000 - 60.000 s 0.001 5.000 Minimum operate time for inverse curves
for step 2
t2Max 0.00 - 6000.00 s 0.01 1000.00 Maximum trip delay for step 2, in sec
ResetMultip2 0.01 - 20.00 - 0.01 1.00 Reset multiplier for K2, defines reset time
of inverse curve
Table 232: NS2PTOC 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
8.12.6 Monitored data
Table 233: NS2PTOC Monitored data
Name Type Values (Range) Unit Description
NSCURR REAL - A Negative sequence
current in primary amps
8.12.7 Operation principle
The negative sequence time overcurrent protection for machines (NS2PTOC)
function directly measures the amplitude of the negative phase sequence component
of the measured current. NS2PTOC sets the START, ST1 or 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.
Section 8
1MRK502052-UEN B
Current protection
438
Technical manual