ABB ret650, Product Manual

Page: 41 / 70

Current protection
Table 29. Instantaneous phase overcurrent protection, 3-phase output PHPIOC
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% -
Operate time 20 ms typically at 0 to 2 x I
set
-
Reset time 30 ms typically at 2 to 0 x I
set
-
Critical impulse time 10 ms typically at 0 to 2 x I
set
-
Operate time 10 ms typically at 0 to 5 x I
set
-
Reset time 40 ms typically at 5 to 0 x I
set
-
Critical impulse time 2 ms typically at 0 to 5 x I
set
-
Dynamic overreach
< 5% at t = 100 ms
-
Table 30. 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% at (50–2500)% of
lBase
-
Min. operating current (5-10000)% 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
69 , table 70 and table 71
15 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 35 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
Transformer protection RET650 1MRK 504 137-BEN B
Product version: 1.3
ABB 41