ABB RELION 670 Series Product Manual page 65

Transformer protection RET670 2.1 IEC
Table 31. 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
ABB
GUID-0BD8D3C9-620A-426C-BDB5-DAA0E4F8247F v4
set
to 0
set
to 0
set
set
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 504 155-BEN F
Accuracy
±1.0% of I
r
±1.0% of I
r
±0.5% of U
r
±0.5% of U
r
±0.2% or ±40 ms
whichever is greater
±0.2% or ± 40 ms
whichever is greater
±0.2% or ±40 ms
whichever is greater
±0.2% or ±40 ms
whichever is greater
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