ABB RELION 670 Series Product Manual page 64

Transformer protection RET670 2.1 IEC
Table 29. 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
Table 30. High impedance differential protection, single phase HZPDIF
Function
Operate voltage
Reset ratio
Maximum continuous power
Operate time at 0 to 10 x U
d
Reset time at 10 x U to 0
d
Critical impulse time
Operate time at 0 to 2 x U
d
Reset time at 2 x U to 0
d
Critical impulse time
64
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
M13081-1 v12
Range or value
(10-900) V
I=U/R
>95% at (30-900) V
2
U>Trip /SeriesResistor ≤200 W
Min. = 5 ms
Max. = 15 ms
Min. = 75 ms
Max. = 95 ms
2 ms typically at 0 to 10 x U
Min. = 25 ms
Max. = 35 ms
Min. = 50 ms
Max. = 70 ms
15 ms typically at 0 to 2 x U
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
Accuracy
±1.0% of I
±1.0% of I at I > I
-
-
-
d
-
d
1MRK 504 155-BEN F
at I ≤ I
r r
r
ABB