ABB RELION 670 Series Product Manual page 85

Transformer protection RET670 2.1 IEC
Table 62. Negative sequence time overcurrent protection for machines NS2PTOC
Function
Operate current, step 1 - 2
Reset ratio
Operate time, start at 0 to 2 x I
Reset time, start at 2 x I
set
Operate time, start at 0 to 10 x I
Reset time, start at 10 x I
set
Time characteristics
Inverse time characteristic, step 1 -
2
2
=
I t K
2
Reset time, inverse characteristic,
step 1 - 2
2
=
I t K
2
Minimum operate time for inverse
time characteristic, step 1 - 2
Maximum trip delay at 0.5 x I
2 x I , step 1 - 2
set
Independent time delay at 0.5 x I
to 2 x I , step 1 - 2
set
Independent time delay for Alarm
at 0.5 x I to 2 x I
set set
ABB
GUID-E5718F80-556D-4852-A8F2-90E0F578D763 v9
Range or value
IBase
(3-500)% of
>95%
Min. = 15 ms
set
Max. = 30 ms
to 0 Min. = 15 ms
Max. = 30 ms
Min. = 5 ms
set
Max. = 20 ms
to 0 Min. = 20 ms
Max. = 35 ms
Definite or Inverse
K=1.0-99.0
Reset Multiplier = 0.01-20.00
(0.000-60.000) s
to (0.00-6000.00) s
set
(0.00-6000.00) s
set
(0.00-6000.00) s
Accuracy
±1.0% of I at I ≤ I
r r
±1.0% of I at I > I
r
-
-
-
-
-
-
±2.0% or ±40 ms whichever is greater
±5.0% or ±40 ms whichever is greater
±0.2% or ±35 ms whichever is greater
±0.2% or ±35 ms whichever is greater
±0.2% or ±35 ms whichever is greater
±0.2% or ±35 ms whichever is greater
1MRK 504 155-BEN F
85