ABB Relion 650 series RET650 Product Manual page 51

ABB
Transformer protection RET650
Product version: 1.1
Table 25. Four step phase overcurrent protection OC4PTOC
Function
Operate current
Reset ratio
Min. operating current
Independent time delay
Minimum operate time
for inverse characteristics
Inverse characteristics,
see table 61, table 62 and
table 63
Operate time,
nondirectional start
function
Reset time, nondirectional
start function
Operate time, directional
start function
Reset time, directional
start funciton
Critical impulse time
Impulse margin time
Setting range
(5-2500)% of lBase
> 95%
(1-10000)% of lBase
(0.000-60.000) s
(0.000-60.000) s
17 curve types
20 ms typically at 0 to 2 x I
30 ms typically at 2 to 0 x I
30 ms typically at 0 to 2 x I
25 ms typically at 2 to 0 x I
10 ms typically at 0 to 2 x I
15 ms typically
1MRK 504 127-BEN -
Issued: February 2011
Accuracy
± 1.0% of I
at I ≤ I
r
± 1.0% of I at I > I
-
± 1.0% of I
at I ≤ I
r
of I at I > I
r
± 0.5% ±25 ms
± 0.5% ±25ms
See table 61, table
table 63
-
set
-
set
-
set
-
set
-
set
-
r
r
±1.0%
r
62 and
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