
M13062-1 v16.1.1
Table 29. Restricted earth-fault protection, low impedance REFPDIF
Function
Range or value
Accuracy
Operating characteristic
Adaptable
±1.0% of I
r
at I ≤ I
r
±1.0% of I at I > I
r
Reset ratio
>95%
-
Minimum pickup, IdMin
(4.0-100.0)% of IBase
±1.0% of I
r
Directional characteristic
Fixed 180 degrees or ±60 to
±90 degrees
±2.0 degrees
Operate time, trip at 0 to 10 x
IdMin
Min. = 15 ms
Max. = 30 ms
-
Reset time, trip at 10 to 0 x
IdMin
Min. = 15 ms
Max. = 30 ms
-
Second harmonic blocking
40.0% of fundamental
±1.0% of I
r
M13081-1 v12
Table 30. High impedance differential protection, single phase HZPDIF
Function
Range or value
Accuracy
Operate voltage
(10-900) V
I=U/R
±1.0% of I
r
at I ≤ I
r
±1.0% of I at I > I
r
Reset ratio
>95% at (30-900) V
-
Maximum continuous power
U>Trip
2
/SeriesResistor ≤200 W
-
Operate time at 0 to 10 x U
d
Min. = 5 ms
Max. = 15 ms
Reset time at 10 x U
d
to 0
Min. = 75 ms
Max. = 95 ms
Critical impulse time
2 ms typically at 0 to 10 x U
d
-
Operate time at 0 to 2 x U
d
Min. = 25 ms
Max. = 35 ms
Reset time at 2 x U
d
to 0
Min. = 50 ms
Max. = 70 ms
Critical impulse time
15 ms typically at 0 to 2 x U
d
-
1MRK 504 155-BEN F
Transformer protection RET670 2.1 IEC
64
ABB