ABB Relion 650 Series Product Manual page 37

Transformer protection RET650
Version 1.1 ANSI
Table 26. Instantaneous residual overcurrent protection EFPIOC (50N)
Function
Operate current
Reset ratio
Operate time
Reset time
Critical impulse time
Operate time
Reset time
Critical impulse time
Dynamic overreach
ABB Power Grids
Range or value
(1-2500)% of lBase
> 95%
20 ms typically at 0 to 2 x I
set
30 ms typically at 2 to 0 x I
set
10 ms typically at 0 to 2 x I
set
10 ms typically at 0 to 10 x I
set
40 ms typically at 10 to 0 x I
set
2 ms typically at 0 to 10 x I
set
< 5% at t = 100 ms
© Copyright 2011 ABB Power Grids. All rights reserved
M12340-2 v4
1MRK 504 127-BUS B
Accuracy
± 1.0% of I at I £ I
n n
± 1.0% of I at I > I
n
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