Table 53. Negative sequence overvoltage protection (NSPTOV)
Characteristic
Value
Operation accuracy
At the frequency f = f
n
±1.5% of the set value or ±0.002 × U
n
Start time
1)2)
U
Fault
= 1.1 x set
Start value
U
Fault
= 2.0 x set
Start value
Typical 29 ms (±15ms)
Typical 24 ms (±15ms)
Reset time
< 40 ms
Reset ratio
Typical 0.96
Retardation time
< 35 ms
Operate time accuracy in definite time mode
±1.0% of the set value or ±20 ms
Suppression of harmonics
DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,
…
1) Residual voltage before fault = 0.0 × U
n
, f
n
= 50 Hz, residual overvoltage with nominal frequency injected from
random phase angle
2) Includes the delay of the signal output contact
Table 54. Negative sequence overvoltage protection (NSPTOV) main settings
Parameter
Function
Value (Range)
Step
Start value
NSPTOV
0.010...1.000 pu
0.001
Operate delay time
NSPTOV
0.040...120.000 s
0.001
Feeder Protection and Control
1MRS756380 A
REF630
Product version: 1.0
Issued: 15.09.2009
42
ABB
Summary of Contents for REF630
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