Differential protection
Table 31. 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
-
Table 32. Additional security logic for differential protection LDRGFC
Function Range or value Accuracy
Operate current, zero sequence current (1-100)% of lBase ±1.0% of I
r
Operate current, low current operation (1-100)% of lBase ±1.0% of I
r
Operate voltage, phase to neutral (1-100)% of UBase ±0.5% of U
r
Operate voltage, phase to phase (1-100)% of UBase ±0.5% of U
r
Independent time delay, zero sequence current at 0 to 2 x I
set
(0.000-60.000) s ±0.2% or ±40 ms
whichever is greater
Independent time delay, low current operation at 2 x I
set
to 0 (0.000-60.000) s ±0.2% or ± 40 ms
whichever is greater
Independent time delay, low voltage operation at 2 x U
set
to 0 (0.000-60.000) s ±0.2% or ±40 ms
whichever is greater
Reset time delay for startup signal at 0 to 2 x U
set
(0.000-60.000) s ±0.2% or ±40 ms
whichever is greater
1MRK 506 372-BEN -
Line distance protection REL670 2.2
Product version: 2.2
ABB 63
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