M12342-1 v22
Table 58. Directional phase overcurrent protection, four steps OC4PTOC
Function Range or value Accuracy
Operate current, step 1-4 (5-2500)% of
lBase
±1.0% of I
r
at I ≤ I
r
±1.0% of I at I > I
r
Reset ratio > 95% at (50–2500)% of
lBase
-
Minimum operate current, step 1-4 (1-10000)% of
lBase
±1.0% of I
r
at I ≤ I
r
±1.0% of I at I > I
r
Relay characteristic angle (RCA) (40.0–65.0) degrees
±2.0 degrees
Relay operating angle (ROA) (40.0–89.0) degrees
±2.0 degrees
Second harmonic blocking (5–100)% of fundamental
±2.0% of 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
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 -
Operate frequency, directional
overcurrent
38-83 Hz -
Operate frequency, non-directional
overcurrent
10-90 Hz -
Line differential protection RED670
1MRK 505 379-BEN N
Hitachi Power Grids 95
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