ABB RELION 650 Series Product Manual page 37

Transformer protection RET650 2.1 IEC
Table 24. Restricted earth-fault protection, low impedance REFPDIF
Function
Operating characteristic
Reset ratio
Minimum pickup, IdMin
Directional characteristic
Operate time, trip at 0 to 10 x
IdMin
Reset time, trip at 10 to 0 x
IdMin
Second harmonic blocking
ABB
M13062-1 v16.1.1
Range or value
Adaptable
>95%
(4.0-100.0)% of IBase
Fixed 180 degrees or ±60 to
±90 degrees
Min. = 15 ms
Max. = 30 ms
Min. = 15 ms
Max. = 30 ms
40.0% of fundamental
Accuracy
±1.0% of I at I ≤ I
r r
±1.0% of I at I > I
r
-
±1.0% of I
r
±2.0 degrees
-
-
±1.0% of I
r
1MRK 504 161-BEN C
37