Table 42. Residual overvoltage protection (ROVPTOV)
Operation
accuracy
Depending on the frequency of the voltage measured: f
n
±2Hz
±1.5% of the set value or ±0.002 x U
n
Start time
1) 2)
Minimum Typical Maximum
U
Fault
= 1.1 x set Start value 29 ms 31 ms 32 ms
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: -50dB at f = n x f
n
,
where n = 2, 3, 4, 5,…
1) Residual voltage before fault 0.0 x U
n
, f
n
= 50 Hz, residual voltage with nominal frequency injected from random
phase angle, results based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
Table 43. Residual overvoltage protection (ROVPTOV) main settings
Parameter Function Value (Range) Step
Start value ROVPTOV 0.010...1.000 x U
n
0.001
Operate delay time ROVPTOV 40...300000 ms 1
Table 44. Negative phase-sequence current protection (NSPTOC)
Operation accuracy Depending on the frequency of the
current measured: f
n
= ±2Hz
±1.5% of the set value or ±0.002 x I
n
Start time
1) 2)
Minimum Typical Maximum
I
Fault
= 2 x set Start value
I
Fault
= 10 x set Start value
22 ms
14 ms
24 ms
16 ms
25 ms
17 ms
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
Operate time accuracy in inverse time mode ±5.0% of the theoretical value or ±20
ms
3)
Suppression of harmonics DFT: -50dB at f = n x f
n
, where
n = 2, 3, 4, 5,…
1)
Negative sequence current before fault = 0.0, f
n
= 50 Hz, results based on statistical distribution of
1000 measurements
2)
Includes the delay of the signal output contact
3)
Maximum Start value = 2.5 x I
n
, Start value multiples in range of 1.5 to 20
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