M15223-1 v18
Table 60. Directional residual overcurrent protection, four steps EF4PTOC
Function Range or value Accuracy
Operate current, step 1-4 (1-2500)% of IBase ±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
-
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
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
Second harmonic blocking (5–100)% of fundamental ±2.0% of I
r
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 source Z used for current
polarization
(0.50-1000.00) W/phase
-
Imaginary part of source Z 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 -
*Note: Operate time and reset time are only valid if harmonic blocking is turned off for a step.
Line differential protection RED670
1MRK 505 379-BEN N
Hitachi Power Grids 97
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