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Line distance protection REL670
Version 2.2
Differential protection
Table 35. 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.
Table 36. Additional security logic for differential protection LDRGFC
Function
Operate current, zero sequence current
Operate current, low current operation
Operate voltage, phase to neutral
Operate voltage, phase to phase
Independent time delay, zero sequence current at 0 to 2 x I
Independent time delay, low current operation at 2 x I
Independent time delay, low voltage operation at 2 x U
Reset time delay for startup signal at 0 to 2 x U
Hitachi Energy
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
set
to 0
set
to 0
set
set
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Accuracy
±1.0% of I
at I ≤ I
r
r
±1.0% of I at I > I
r
-
-
-
-
Range or value
(1-100)% of lBase
(1-100)% of lBase
(1-100)% of UBase
(1-100)% of UBase
(0.000-60.000) s
(0.000-60.000) s
(0.000-60.000) s
(0.000-60.000) s
1MRK 506 372-BEN Q
GUID-0BD8D3C9-620A-426C-BDB5-DAA0E4F8247F v5
Accuracy
±1.0% of I
r
±1.0% of I
r
±0.5% of U
r
±0.5% of U
r
±0.2% or ±35 ms
whichever is greater
±0.2% or ± 35 ms
whichever is greater
±0.2% or ±35 ms
whichever is greater
±0.2% or ±35 ms
whichever is greater
79
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