Table 34. Three-phase overvoltage protection (PHPTOV)
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 22 ms 24 ms 26 ms
Reset time < 40 ms
Reset ratio Depends on the Relative hysteresis
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) Start value = 1.0 x U
n
, Voltage before fault 0.9 x U
n
, f
n
= 50 Hz, overvoltage in one phase-to-phase 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
3) Maximum Start value = 1.20 x U
n
, Start value multiples in range of 1.10 to 2.00
Table 35. Three-phase overvoltage protection (PHPTOV) main settings
Parameter Function Value (Range) Step
Start value PHPTOV 0.05...1.60 x U
n
0.01
Time multiplier PHPTOV 0.05...15.00 0.05
Operate delay time PHPTOV 40...300000 ms 10
Operating curve type
1)
PHPTOV Definite or inverse time
Curve type: 5, 15, 17, 18, 19, 20
1) For further reference please refer to the Operating characteristics table at the end of the Technical data chapter
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