ABB Relion 650 series RET650 Product Manual page 52

Transormer protection
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Transformer protection RET650
Product version: 1.1
Table 26. Instantaneous residual overcurrent protection EFPIOC
Function
Operate current
Reset ratio
Operate time
Reset time
Critical impulse time
Operate time
Reset time
Critical impulse time
Dynamic overreach
52
Range or value
(1-2500)% of lBase
> 95%
20 ms typically at 0 to 2 x I
30 ms typically at 2 to 0 x I
10 ms typically at 0 to 2 x I
10 ms typically at 0 to 10 x I
40 ms typically at 10 to 0 x I
2 ms typically at 0 to 10 x I
< 5% at t = 100 ms
1MRK 504 127-BEN -
Issued: February 2011
Accuracy
± 1.0% of I
at I £ I
r
± 1.0% of I at I > I
-
-
set
-
set
-
set
-
set
-
set
-
set
-
r
r
ABB

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