Table 32. Four step negative sequence overcurrent protection NS4PTOC
Function Range or value Accuracy
Operate value, negative
sequence current, step 1-4
(1-2500)% of
lBase
± 1.0% of I
r
at I £ I
r
± 1.0% of I at I > I
r
Reset ratio > 95% -
Timers (0.000-60.000) s ± 0.5% ± 10 ms
Inverse characteristics, see table
98, table 99 and table 100
18 curve types See table 98, table 99 and table
100
Minimum operate current for step
1 - 4
(1.00 - 10000.00)% of
IBase
± 1.0% of I
r
at I < I
r
± 1.0% of I at I > I
r
Operate value, negative current
for directional release
(1–100)% of
IBase
± 1.0% of I
r
Relay characteristic angle (-180 to 180) degrees ± 2.0 degrees
Minimum polarizing voltage (1–100)% of
UBase
± 0.5% of U
r
Minimum polarizing current (2-100)% of
IBase
±1.0% of I
r
Real part of negative sequence
source impedance used for
current polarization
(0.50-1000.00) W/phase -
Imaginary part of negative
sequence source impedance
used for current polarization
(0.50–3000.00) W/phase -
Operate time, start function 25 ms typically at 0.5 to 2 x I
set
-
Reset time, start function 25 ms typically at 2 to 0.5 x I
set
-
Critical impulse time, start
function
10 ms typically at 0 to 2 x I
set
-
Impulse margin time, start
function
15 ms typically -
Transient overreach <10% at τ = 100 ms -
1MRK511232-BEN E
Pre-configured
Product version: 1.2
ABB 41
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