GUID-BACA37F7-E945-40BC-BF9D-A65BFC96CA91 v9
Table 53. Phase preference logic PPLPHIZ
Function Range or value Accuracy
Operate value, phase-to-phase and
phase-to-neutral undervoltage,
UPN<
and
UPP<
(10 - 90)% of UBase ±0.5% of U
r
Reset ratio, undervoltage < 105% -
Operate value, residual voltage,
3U0>
(10 - 300)% of UBase ±0.5% of U
r
at U ≤ U
r
±0.5% of U at U > U
r
Reset ratio, residual voltage > 95% -
Operate value, residual current,
IN>
(10 - 200)% of IBase ±1.0% of I
r
at I ≤ I
r
±1.0% of I at I > I
r
Reset ratio, residual current > 95% -
Independent time delay for residual
current at 0 to 2 x I
set
,
tIN
(0.000 - 60.000) s ±0.2% or ±25 ms whichever is greater
Independent time delay for residual
voltage at 0.8 x U
set
to 1.2 x U
set
,
tUN
(0.000 - 60.000) s ±0.2% or ±25 ms whichever is greater
Independent dropoff-delay for
residual voltage at 1.2 x U
set
to 0.8 x
U
set
,
tOffUN
(0.000 - 60.000) s ±0.2% or ±25 ms whichever is greater
Operating mode No Filter, NoPref
Cyclic: 1231c, 1321c
Acyclic: 123a, 132a, 213a, 231a,
312a, 321a
Line differential protection RED670
1MRK 505 379-BEN N
Hitachi Power Grids 91
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