Positive-Sequence Overvoltage Protection - ABB RET630 Product Manual

Transformer Protection and Control
RET630
Product version: 1.0
Table 49. Positive-sequence overvoltage protection (PSPTOV)
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 = 0.0 x U
random phase angle
2) Includes the delay of the signal output contact
Table 50. Positive-sequence overvoltage protection (PSPTOV) main settings
Parameter
Start value
Operate delay time
38
U = 1.1 x set
Fault
Start value
U = 2.0 x set
Fault
Start value
, f = 50 Hz, residual voltage with nominal frequency injected from
n n
Function
PSPTOV
PSPTOV
Value
At the frequency f = f
n
±1.5% of the set value or ±0.002 x U
Typical: 29 ms (±15 ms)
Typical: 24 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 x f
n
...
Value (Range)
0.800...1.600 pu
0.040...120.000 s
1MRS756788 A
Issued: 15.09.2009
n
, where n = 2, 3, 4, 5,
Step
0.001
0.001
ABB