ABB Relion 650 Series Product Manual page 38

Transformer protection RET650
Version 1.1 ANSI
Table 27. Four step residual overcurrent protection EF4PTOC (51N/67N)
Function
Operate current
Reset ratio
Operate current for directional
comparison
Min. operating current
Minimum operate time for
inverse characteristics
Timers
Inverse characteristics, see
table 61, table 62 and table 63
Minimum polarizing voltage
Minimum polarizing current
Real part of source Z used for
current polarization
Imaginary part of source Z
used for current polarization
Operate time, non-directional
pickup function
Reset time, non-directional
pickup function
Operate time, directional
pickup function
Reset time, directional pickup
function
38
Range or value
(1-2500)% of lBase
> 95%
lBase
(1–100)% of
(1-10000)% of lBase
(0.000-60.000) s
(0.000-60.000) s
17 curve types
VBase
(1–100)% of
IBase
(2-100)% of
(0.50-1000.00) W/phase
(0.50–3000.00) W/phase
30 ms typically at 0.5 to 2 x I
set
30 ms typically at 2 to 0.5 x I
set
30 ms typically at 0,5 to 2 x I
N
30 ms typically at 2 to 0,5 x I
N
© Copyright 2011 ABB Power Grids. All rights reserved
M15223-1 v7
1MRK 504 127-BUS B
Accuracy
± 1.0% of I at I £ I
n n
± 1.0% of I at I > I
n
-
± 1.0% of I
n
± 1.0% of I at I < I ± 1.0% of I
n n
at I < I
n
± 0.5% ± 25 ms
± 0.5% ±25 ms
See table 61, table 62 and table
63
± 0.5% of V
n
±1.0% of I
n
-
-
-
-
-
-
ABB Power Grids