Table 54. Four step directional negative phase sequence overcurrent protection NS4PTOC
Function
Range or value
Accuracy
Operate 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% at (10-2500)% of
IBase
-
Independent time delay at 0 to 2 x I
set
, step
1 - 4
(0.000-60.000) s
±0.2% or ±35 ms whichever is greater
Minimum operate time for inverse curves,
step 1 - 4
(0.000 - 60.000) s
±0.2% or ±35 ms whichever is greater
Inverse time characteristics, see table
,
16 curve types
See table
Minimum operate current, 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
Relay characteristic angle (RCA)
(-180 to 180) degrees
±
2.0 degrees
Operate current for directional release
(1–100)% of
IBase
For RCA ±60 degrees:
±2.5% of I
r
at I ≤ I
r
±2.5% of I at I > I
r
Minimum polarizing voltage
(1–100)% of
UBase
±0.5% of U
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 non-directional at 0 to 2
x I
set
Min. = 15 ms
Max. = 30 ms
-
Reset time, start non-directional at 2 x I
set
to
0
Min. = 15 ms
Max. = 30 ms
-
Operate time, start non-directional at 0 to
10 x I
set
Min. = 5 ms
Max. = 20 ms
-
Reset time, start non-directional at 10 x I
set
to 0
Min. = 20 ms
Max. = 35 ms
-
Critical impulse time
10 ms typically at 0 to 2 x I
set
-
Impulse margin time
15 ms typically
-
Transient overreach
<10% at τ = 100 ms
-
1MRK 506 372-BEN -
Line distance protection REL670 2.2
Product version: 2.2
ABB
77
