ABB REQ650 - Page 63

Table 26. Four step phase overcurrent protection, 3-phase output OC4PTOC
Function Setting range 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% -
Min. operating current (1-10000)% of lBase ± 1.0% of I
r
at I ≤ I
r
±1.0% of I at I > I
r
2nd harmonic blocking (5–100)% of fundamental ± 2.0% of I
r
Independent time delay (0.000-60.000) s ± 0.5% ±25 ms
Minimum operate time for
inverse characteristics
(0.000-60.000) s ± 0.5% ±25 ms
Inverse characteristics, see
table 73, table 74 and table 75
17 curve types
1)
ANSI/IEEE C37.112
IEC 60255–151
±3% or ±40 ms
0.10 ≤ k ≤ 3.00
1.5 x I
set
≤ I ≤ 20 x I
set
Operate time, nondirectional
start function
25 ms typically at 0 to 2 x I
set
-
Reset time, nondirectional start
function
30 ms typically at 2 to 0 x I
set
-
Operate time, directional start
function
50 ms typically at 0 to 2 x I
set
-
Reset time, directional start
function
35 ms typically at 2 to 0 x I
set
-
Critical impulse time 10 ms typically at 0 to 2 x I
set
-
Impulse margin time 15 ms typically -
1)
Note: Timing accuracy only valid when 2nd harmonic blocking is turned off
Breaker protection REQ650 1MRK 505 283-BEN -
Product version: 1.2
ABB 63