Table 27. 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, Zero sequence
(1–100)% of
lBase
± 2.0% of I
n
Operate current for directional
comparison, Negative sequence
(1–100)% of
lBase
± 2.0% 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
70, table 71 and table 72
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
Minimum polarizing voltage, Zero
sequence
(1–100)% of
VBase
± 0.5% of V
n
Minimum polarizing voltage,
Negative sequence
(1–100)% of
VBase
± 0.5% of V
n
Minimum polarizing current, Zero
sequence
(2–100)% of
IBase
±1.0% of I
n
Minimum polarizing current,
Negative sequence
(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
-
1)
Note: Timing accuracy only valid when 2nd harmonic blocking is turned off.
Bay control REC650 ANSI 1MRK 511 265-BUS B
Product version: 1.2
76 ABB
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