Table 40. Phase preference logic PPLPHIZ
Function Range or value Accuracy
Operate value, phase-to-phase
and phase-to-neutral
undervoltage
(1 - 100)% of UBase ±0.5% of U
r
Reset ratio, undervoltage < 105% -
Operate value, residual voltage (5 - 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 (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
(0.000 - 60.000) s ±0.2% or ±25 ms whichever is greater
Independent time delay for
residual voltage at 0.8 to 1.2 x U
set
(0.000 - 60.000) s ±0.2% or ±25 ms whichever is greater
Independent dropoff-delay for
residual voltage at 1.2 to 0.8 x U
set
(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
Table 41. Underimpedance protection for generators and transformersZGVPDIS Technical data
Function
Range or value Accuracy
Number of zones 3 -
Forward reach
(3.0 - 200.0)% of Z
r
where Z
r
=UBase/√3∗IBase
±5.0% of set impedance
Conditions:
Voltage range: (0.1 - 1.1) x U
r
Current range: (0.5 - 30) x I
r
Reverse reach
(3.0 - 200.0)% of Z
r
where Z
r
=UBase/√3∗IBase
±5.0% of set impedance
Conditions:
Voltage range: (0.1 - 1.1) x U
r
Current range: (0.5 - 30) x I
r
Impedance angle (5 - 90) degrees -
Reset ratio 105% typically -
Start time at 1.2 to 0.8 x set impedance
Min. = 15 ms
-
Max. = 35 ms
Independent time delay to operate at 1.2 to 0.8 x
set impedance
(0.000 – 60.000) s ±0.2% or ±40 ms whichever is greater
Transformer protection RET670 2.0
1MRK 504 141-BEN C
Product version: 2.0
62 ABB
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