ABB RELION 670 Series Product Manual page 74

Transformer protection RET670 2.1 IEC
Table 46. Phase preference logic PPLPHIZ
Function
Operate value, phase-to-phase
and phase-to-neutral
undervoltage
Reset ratio, undervoltage
Operate value, residual voltage
Reset ratio, residual voltage
Operate value, residual current
Reset ratio, residual current
Independent time delay for
residual current at 0 to 2 x I
Independent time delay for
residual voltage at 0.8 x U
set
1.2 x U
set
Independent dropoff-delay for
residual voltage at 1.2 x U
set
0.8 x U
set
Operating mode
Table 47. Underimpedance protection for generators and transformersZGVPDIS Technical data
Function
Number of zones
Forward reach
Reverse reach
Impedance angle
Reset ratio
Start time at 1.2 to 0.8 x set impedance
Independent time delay to operate at 1.2 to
0.8 x set impedance
74
GUID-BACA37F7-E945-40BC-BF9D-A65BFC96CA91 v8
Range or value
(1 - 100)% of UBase
< 105%
(5 - 300)% of UBase
> 95%
(10 - 200)% of IBase
> 95%
(0.000 - 60.000) s
set
(0.000 - 60.000) s
to
(0.000 - 60.000) s
to
No Filter, NoPref
Cyclic: 1231c, 1321c
Acyclic: 123a, 132a, 213a, 231a, 312a, 321a
GUID-E8104D00-3183-4F55-89F9-A74B14BFE6FE v4
Range or value
3
(3.0 - 200.0)% of Z
where Z =UBase/√3∗IBase
r
(3.0 - 200.0)% of Z
where Z =UBase/√3∗IBase
r
(5 - 90) degrees
105% typically
Min. = 15 ms
Max. = 35 ms
(0.000 – 60.000) s
Accuracy
±0.5% of U
r
-
±0.5% of U at U ≤ U
r
±0.5% of U at U > U
-
±1.0% of I at I ≤ I
r
±1.0% of I at I > I
-
±0.2% or ±25 ms whichever is greater
±0.2% or ±25 ms whichever is greater
±0.2% or ±25 ms whichever is greater
Accuracy
±5.0% of set impedance
Conditions:
r
Voltage range: (0.1 - 1.1) x U
Current range: (0.5 - 30) x I
±5.0% of set impedance
Conditions:
r
Voltage range: (0.1 - 1.1) x U
Current range: (0.5 - 30) x I
±0.2% or ±40 ms whichever is greater
1MRK 504 155-BEN F
r
r
r
r
-
r
r
r
r
-
-
-
ABB