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
Содержание RELION REL670
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