ABB Relion 670 Series Product Manual page 72

Generator protection REG670
Version 2.2
Table 42. 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 x IdMin to 0
Second harmonic blocking
Table 43. 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
1)
2
The value U Trip/ R should always be lower than Stabilizing resistor thermal rating to allow continuous activation during testing. If this value is exceeded, testing should be
done with a transient faults. Typical value for the thermal rating of the resistor is 100W.
72
M13062-1 v22
Range or value
Adaptable
> 95%
(4.0-100.0)% of IBase
Fixed 180 degrees or ±60 to ±119
degrees
Min. = 15 ms
Max. = 30 ms
Min. = 15 ms
Max. = 30 ms
40.0% of fundamental
M13081-1 v13
Range or value
(10-900) V
I=U/R
>95% at (30-900) V
1)
See
Min. = 5 ms
Max. = 15 ms
Min. = 75 ms
Max. = 95 ms
2 ms typically at 0 to 10 x U
d
Min. = 25 ms
Max. = 35 ms
Min. = 50 ms
Max. = 70 ms
15 ms typically at 0 to 2 x U
d
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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 at I ≤ I
r r
±1.0% of I at I > I
r
-
-
-
-
1MRK 502 074-BEN M
Hitachi Power Grids