Hitachi Relion 670 Series Product Manual page 103

Line differential protection RED670
Version 2.2
Table 62. Directional residual overcurrent protection, four steps EF4PTOC
Function
Operate current, step 1-4
Reset ratio
Relay characteristic angle
(RCA)
Operate current for directional release
Independent time delay at 0 to 2 x I
1-4
Minimum operate time for inverse curves,
step 1-4
Inverse time characteristics, see Table 215,
Table 217 and Table 219
Second harmonic blocking
Minimum polarizing voltage
Minimum polarizing current
Real part of source Z used for current
polarization
Imaginary part of source Z used for current
polarization
*Operate time, start non-directional at 0 to 2 x
I
set
*Reset time, start non-directional at 2 x I
0
*Operate time, start non-directional at 0 to 10
x I
set
*Reset time, start non-directional at 10 x I
to 0
Critical impulse time
Impulse margin time
*Note: Operate time and reset time are only valid if harmonic blocking is turned off for a step.
Hitachi Energy
M15223-1 v18
Range or value
(1-2500)% of IBase
> 95% at (10-2500)% of IBase
(-180 to 180) degrees
(1–100)% of IBase
, step (0.000-60.000) s
set
(0.000 - 60.000) s
16 curve types
(5–100)% of fundamental
(1–100)% of UBase
(2-100)% of IBase
(0.50-1000.00) W/phase
(0.50–3000.00) W/phase
Min. = 15 ms
Max. = 30 ms
to Min. = 15 ms
set
Max. = 30 ms
Min. = 5 ms
Max. = 20 ms
Min. = 20 ms
set
Max. = 35 ms
10 ms typically at 0 to 2 x I
15 ms typically
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Accuracy
±1.0% of I at I ≤ I
r r
±1.0% of I at I > I
r
-
±2.0 degrees
For RCA ±60 degrees:
±2.5% of I at I ≤ I
r r
±2.5% of I at I > I
r
±0.2% or ±35 ms whichever is greater
±0.2% or ±35 ms whichever is greater
See Table 215, Table 217
±2.0% of I
r
±0.5% of U
r
±1.0% of I
r
-
-
-
-
-
-
-
set
-
1MRK 505 379-BEN R
and Table 219
103