ABB Relion REQ650, Product Manual, Page: 58 / 91

Table 26. Four step residual overcurrent protection EF4PTOC (51N/67N)
Function Range or value Accuracy
Operate current (1-2500)% of lBase
±
1.0% of I
n
at I
£
I
n
±
1.0% of I at I > I
n
Reset ratio > 95% -
Operate current for
directional comparison (1–100)% of lBase
±
1.0% of I
n
Min. operating current (1-10000)% of lBase ± 1.0% of I
n
at I < I
n
±
1.0% of I at I < I
n
Minimum operate time
for inverse characteristics (0.000-60.000) s ± 0.5% ± 25 ms
Timers (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
Minimum polarizing
voltage (1–100)% of VBase
±
0.5% of V
n
Minimum polarizing
current (2-100)% of IBase
±
1.0% of I
n
Real part of source Z
used for current
polarization
(0.50-1000.00)
W
/phase
-
Imaginary part of source
Z used for current
polarization
(0.50–3000.00)
W
/phase
-
Operate time, non-
directional pickup
function 30 ms typically at 0.5 to 2 x I
set
-
Reset time, non-
directional pickup
function 30 ms typically at 2 to 0.5 x I
set
-
Operate time, directional
pickup function 30 ms typically at 0,5 to 2 x I
N
-
Reset time, directional
pickup function 30 ms typically at 2 to 0,5 x I
N
-
Breaker protection REQ650 ANSI 1MRK 505 269-BUS -
Product version: 1.1 Issued: April 2011
58 ABB