ABB RET670 Product Manual page 54

Transformer protection RET670 2.0
Product version: 2.0
Table 24. Restricted earth-fault protection, low impedance REFPDIF
Function
Operate characteristic
Reset ratio
Minimum pickup
Directional characteristic
Operate time, trip at 0 to 10 x
IdMin
Reset time, trip at 10 to 0 x IdMin
Second harmonic blocking
Table 25. 1Ph High impedance differential protection HZPDIF
Function
Operate voltage
Reset ratio
Maximum continuous power
Operate time at 0 to 10 x U
d
Reset time at 10 to 0 x U
d
Critical impulse time
Operate time at 0 to 2 x U
d
Reset time at 2 to 0 x U
d
Critical impulse time
54
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
60.0% of fundamental (hidden
setting)
Range or value
(10-900) V
I=U/R
>95% at (30-900) V
U>Trip
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 for I ≤ I
r r
± 1.0% of I for I > I
r
-
± 1.0% of I
r
± 2.0 degrees
-
-
± 1.0% of I
r
2
/SeriesResistor ≤200 W
d
d
1MRK 504 141-BEN C
Accuracy
± 1.0% of I at I ≤ I
r r
± 1.0% of I at I > I
r
-
-
-
-
ABB