Table 39. Positive sequence undervoltage protection (PSPTUV) main settings
Parameter Function Value (Range) Step
Start value PSPTUV 0.010...1.200 x U
n
0.001
Operate delay time PSPTUV 40...120000 ms 10
Voltage block value PSPTUV 0.01...1.0 x U
n
0.01
Table 40. Negative sequence overvoltage protection (NSPTOV)
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 33 ms 35 ms 37 ms
U
Fault
= 2.0 x set Start value 24 ms 26 ms 28 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) Negative sequence voltage before fault 0.0 x U
n
, f
n
= 50 Hz, negative sequence overvoltage with nominal
frequence injected from random phase angle, results based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
Table 41. Negative sequence overvoltage protection (NSPTOV) main settings
Parameter Function Value (Range) Step
Start value NSPTOV 0.010...1.000 x U
n
0.001
Operate delay time NSPTOV 40...120000 ms 1
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