ABB Relion 630 Series RET630 Product Manual page 47

ABB
Transformer Protection and Control
RET630
Product version: 1.1
Table 58. Negative-sequence overvoltage protection (NSPTOV)
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 × U
random phase angle
2) Includes the delay of the signal output contact
Table 59. Negative-sequence overvoltage protection (NSPTOV) main settings
Parameter
Start value
Operate delay time
U = 1.1 x set
Fault
Start value
U = 2.0 x set
Fault
Start value
, f = 50 Hz, residual overvoltage with nominal frequency injected from
n n
Function
NSPTOV
NSPTOV
Value
At the frequency f = f
n
±1.5% of the set value or ±0.002 × U
Typical 29 ms (± 15ms)
Typical 24 ms (± 15ms)
< 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...1.000 pu
0.040...120.000 s
1MRS756978 D
Issued: 2011-05-18
n
, where n = 2, 3, 4, 5,
Step
0.001
0.001
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