Table 64. 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 65. 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
Motor Protection and Control 1MRS756977 D
REM630
Product version: 1.1 Issued: 2011-05-18
44 ABB
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