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ABB
Transformer protection RET650
Product version: 1.1
Table 27. Four step residual overcurrent protection EF4PTOC
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 start function
Reset time, non-
directional start function
Operate time, directional
start function
Reset time, directional
start function
Range or value
(1-2500)% of lBase
> 95%
(1–100)% of lBase
(1-10000)% of lBase
(0.000-60.000) s
(0.000-60.000) s
17 curve types
(1–100)% of UBase
(2-100)% of IBase
(0.50-1000.00) W/phase
(0.50–3000.00) W/phase
30 ms typically at 0.5 to 2 x I
30 ms typically at 2 to 0.5 x I
30 ms typically at 0,5 to 2 x I
30 ms typically at 2 to 0,5 x I
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
r
± 1.0% of I
at I < I
r
1.0% of I at I < I
± 0.5% ± 25 ms
± 0.5% ±25 ms
See table 61, table
table
63
± 0.5% of U
r
±1.0% of I
r
-
-
-
set
-
set
-
N
-
N
r
r
±
r
r
62
and
53
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