Table 49. Four-step phase overcurrent protection OC4PTOC
Function Setting range 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 171, table 172 and table 173
16 curve types See table 171, table 172 and table 173
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 to 0 x I
set
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 to 0 x I
set
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 -
Table 50. Instantaneous residual overcurrent protection EFPIOC
Function
Range or value Accuracy
Operate current (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 -
Operate time at 0 to 2 x I
set
Min. = 15 ms
Max. = 25 ms
-
Reset time at 2 to 0 x I
set
Min. = 15 ms
Max. = 25 ms
-
Critical impulse time 10 ms typically at 0 to 2 x I
set
-
Operate time at 0 to 10 x I
set
Min. = 5 ms
Max. = 15 ms
-
Reset time at 10 to 0 x I
set
Min. = 25 ms
Max. = 35 ms
-
Critical impulse time 2 ms typically at 0 to 10 x I
set
-
Dynamic overreach
< 5% at t = 100 ms
-
1MRK 505 346-BEN -
Line differential protection RED670 2.1 IEC
Product version: 2.1
68 ABB
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