ABB RELION 620 Series Technical Manual page 666

Section 4
Protection functions
4.5.5.6
4.5.5.7
Table 615: ROVPTOV Group settings (Basic)
Parameter
Start value
Operate delay time
Table 616: ROVPTOV Non group settings (Basic)
Parameter
Operation
Uo signal Sel
Table 617: ROVPTOV Non group settings (Advanced)
Parameter
Reset delay time
660
component. Therefore, this function is often used as a backup protection or as a release
signal for the feeder earth-fault protection.
The protection can also be used for the earth-fault protection of generators and motors
and for the unbalance protection of capacitor banks.
The residual voltage can be calculated internally based on the measurement of the
three-phase voltage. This voltage can also be measured by a single-phase voltage
transformer, located between a transformer star point and earth, or by using an open-
delta connection of three single-phase voltage transformers.
Signals
Table 613: ROVPTOV Input signals
Name
Uo
BLOCK
Table 614: ROVPTOV Output signals
Name
OPERATE
START
Settings
Values (Range) Unit
0.010...1.000 xUn
40...300000 ms
Values (Range) Unit
1=on
5=off
1=Measured Uo
2=Calculated Uo
Values (Range) Unit
0...60000 ms
Type Default Description
SIGNAL 0 Residual voltage
BOOLEAN 0=False Block signal for activating the blocking mode
Type Description
BOOLEAN Operate
BOOLEAN Start
Step Default
0.001 0.030
1 40
Step Default
1=on
1=Measured Uo
Step Default
1 20
1MRS757644 F
Description
Residual overvoltage start value
Operate delay time
Description
Operation Off / On
Selection for used Uo signal
Description
Reset delay time
Technical Manual
620 series