Hitachi Relion 670 Series Product Manual page 89

Line differential protection RED670
Version 2.2
Table 41. 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
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GUID-0BD8D3C9-620A-426C-BDB5-DAA0E4F8247F v5
set
to 0
set
to 0
set
set
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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 505 379-BEN R
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
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