Current protection
Table 24. Instantaneous phase overcurrent protection PHPIOC
Function
Range or value
Accuracy
Operate current
(5-2500)% of lBase
±
1.0% of I
r
at I
£
I
r
±
1.0% of I at I > I
r
Reset ratio
> 95%
-
Operate time
20 ms typically at 0 to 2 x I
set
-
Reset time
35 ms typically at 2 to 0 x I
set
-
Critical impulse time
10 ms typically at 0 to 2 x I
set
-
Operate time
10 ms typically at 0 to 10 x I
set
-
Reset time
45 ms typically at 10 to 0 x I
set
-
Critical impulse time
2 ms typically at 0 to 10 x I
set
-
Dynamic overreach
< 5% at
t
= 100 ms
-
Transformer protection RET650
1MRK 504 127-BEN -
Product version: 1.1
Issued: February 2011
50
ABB