GUID-E83AD807-8FE0-4244-A50E-86B9AF92469E v6
Table 61. 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
195, table 197 and table 199
16 curve types See table 195, table 197 and table 199
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 -
Line differential protection RED670
1MRK 505 379-BEN N
98 Hitachi Power Grids
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