ABB RET670 - Page 54

Table 24. Restricted earth-fault protection, low impedance REFPDIF
Function Range or value Accuracy
Operate characteristic Adaptable ± 1.0% of I
r
for I ≤ I
r
± 1.0% of I for I > I
r
Reset ratio >95% -
Minimum pickup (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 60.0% of fundamental (hidden
setting)
± 1.0% of I
r
Table 25. 1Ph High impedance differential protection 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 to 0 x U
d
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 to 0 x U
d
Min = 50 ms
Max = 70 ms
Critical impulse time 15 ms typically at 0 to 2 x U
d
-
Transformer protection RET670 2.0
1MRK 504 141-BEN C
Product version: 2.0
54 ABB