ABB RELION 650 Series Product Manual page 40

Transformer protection RET650 2.1 IEC
Table 27. 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
set
Reset time at 10 to 0 x I
set
Critical impulse time
Dynamic overreach
40
M12340-2 v8
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
set
Min. = 5 ms
Max. = 15 ms
Min. = 25 ms
Max. = 35 ms
2 ms typically at 0 to 10 x I
set
< 5% at t = 100 ms
1MRK 504 161-BEN C
Accuracy
±1.0% of I at I ≤ I
r r
±1.0% of I at I > I
r
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ABB