Characteristic Value
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 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
4.5.3.10 Technical revision history
Table 407: ROVPTOV Technical revision history
Technical revision Change
B Added a setting parameter for the "Measured
Uo" or "Calculated Uo" selection
4.5.4 Negative-sequence overvoltage protection NSPTOV
4.5.4.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Negative-sequence overvoltage
protection
NSPTOV U2> 47O-
4.5.4.2 Function block
GUID-F94BCCE8-841F-405C-B659-3EF26F959557 V1 EN
Figure 256: Function block
4.5.4.3 Functionality
The negative-sequence overvoltage protection NSPTOV is used to detect negative
sequence overvoltage conditions. NSPTOV is used for the protection of machines.
The function starts when the negative sequence voltage exceeds the set limit.
NSPTOV operates with the definite time (DT) characteristics.
The function contains a blocking functionality. It is possible to block function
outputs, the definite timer or the function itself, if desired.
1YHT530004D05 D Section 4
Protection functions
615 series 485
Technical Manual
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