ABB Relion REQ650, Product Manual

Page: 56 / 91

Table 24. Four step phase overcurrent protection OC4SPTOC (51_67)
Function Setting range Accuracy
Operate current (5-2500)% of lBase
±
1.0% of I
n
at I
£
I
n
±
1.0% of I at I > I
n
Reset ratio > 95% -
Min. operating current (1-10000)% of lBase
±
1.0% of I
n
at I < I
n
±
1.0% of I at I > I
n
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
17 curve types See table 69 , table 70 and
table 71
Operate time,
nondirectionalpickup
function 20 ms typically at 0 to 2 x I
set
-
Reset time, pickup
function 30 ms typically at 2 to 0 x I
set
-
Operate time, directional
pickup function 30 ms typically at 0 to 2 x I
set
-
Reset time, directional
pickup function 25 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 -
Breaker protection REQ650 ANSI 1MRK 505 269-BUS -
Product version: 1.1 Issued: April 2011
56 ABB