M15223-1 v18
Table 62. 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
Table
16 curve types
See Table
and Table
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 R
Version 2.2
Hitachi Energy
103
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