ABB RELION 670 Series Product Manual page 77

Transformer protection RET670 2.1 IEC
Table 50. Instantaneous residual overcurrent protection EFPIOC
Function
Operate current
Reset ratio
Operate time at 0 to 2 x I
set
Reset time at 2 to 0 x I
set
Critical impulse time
Operate time at 0 to 10 x I
Reset time at 10 to 0 x I
set
Critical impulse time
Dynamic overreach
ABB
Range or value
(5-2500)% of lBase
> 95% at (50–2500)% of lBase
Min. = 15 ms
Max. = 25 ms
Min. = 15 ms
Max. = 25 ms
10 ms typically at 0 to 2 x I
Min. = 5 ms
set
Max. = 15 ms
Min. = 25 ms
Max. = 35 ms
2 ms typically at 0 to 10 x I
< 5% at t = 100 ms
M12340-2 v8
set
set
1MRK 504 155-BEN F
Accuracy
±1.0% of I at I ≤ I
r r
±1.0% of I at I > I
r
-
-
-
-
-
-
-
-
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