ABB Relion 630 Series RET630 Product Manual page 46

Transformer Protection and Control
RET630
Product version: 1.1
Table 56. Positive-sequence undervoltage protection (PSPTUV)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Suppression of harmonics
1) Residual voltage before fault = 1.1 × U
random phase angle
2) Includes the delay of the signal output contact
Table 57. Positive-sequence undervoltage protection (PSPTUV) main settings
Parameter
Start value
Operate delay time
Voltage block value
46
U = 0.9 x set Start
Fault
value
, f = 50 Hz, residual voltage with nominal frequency injected from
n n
Function
PSPTUV
PSPTUV
PSPTUV
Value
At the frequency f = f
n
±1.5% of the set value or ±0.002 × U
Typical 28 ms (±15 ms)
< 40 ms
Typical 0.96
< 35 ms
±1.0% of the set value or ±20 ms
DFT: -50 dB at f = n × f
n
...
Value (Range)
0.010...1.200 pu
0.040...120.000 s
0.01...1.0 pu
1MRS756978 D
Issued: 2011-05-18
n
, where n = 2, 3, 4, 5,
Step
0.001
0.001
0.01
ABB