ABB Relion 620 Series - Residual Overvoltage Protection ROVPTOV

4.5.4.10 Technical data
Table 612: PHAPTUV Technical data
Characteristic Value
Operation accuracy Depending on the frequency of the voltage measured: f
n
±2 Hz
±1.5% of the set value or ±0.002 × U
n
Start time , U
Fault
= 0.9 × set Start
value
Minimum Typical Maximum
64 ms
68 ms 71 ms
Reset time Typically 40 ms
Reset ratio Depends on the set 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
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
4.5.5 Residual overvoltage protection ROVPTOV
4.5.5.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE
C37.2 device
number
Residual overvoltage protection ROVPTOV Uo> 59G
4.5.5.2 Function block
Figure 343: Function block
4.5.5.3 Functionality
The residual overvoltage protection function ROVPTOV is used in distribution
networks where the residual overvoltage can reach non-acceptable levels in, for
example, high impedance earthing.
The function starts when the residual voltage exceeds the set limit. ROVPTOV
operates with the definite time (DT) characteristic.
The function contains a blocking functionality. It is possible to block function
outputs, the definite timer or the function itself, if desired.
1
Start value = 1.0 × U
n
, Voltage before fault = 1.1 × U
n
, f
n
= 50 Hz, undervoltage in one phase-to-
phase 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
3
Minimum Start value = 0.50, Start value multiples in range of 0.90...0.20
Protection functions 1MRS757644 H
660 620 series
Technical Manual