ABB relion REF615 Applications Manual page 245

1MRS756378 S
REF615
Application Manual
The residual overvoltage protection ROVPTOV provides earth fault protection by
detecting an abnormal level of residual voltage. It can be used, for example, as a non-
selective backup protection for the earth-fault functionality.
ROVPTOV1_OPERATE
ROVPTOV2_OPERATE
ROVPTOV3_OPERATE
GUID-521EA0D0-2332-4E90-A1FE-C405463CDBCF V1 EN
Figure 345: Residual overvoltage protection function
The selectable underfrequency or overfrequency protection FRPFRQ prevents
damage to network components under unwanted frequency conditions. The function
also contains a selectable rate of change of the frequency (gradient) protection to
detect an increase or decrease in the fast power system frequency at an early stage.
This can be used as an early indication of a disturbance in the system.
REF615 standard configurations
ROVPTOV1
BLOCK OPERATE
START
ROVPTOV2
BLOCK OPERATE
START
ROVPTOV3
BLOCK OPERATE
START
OR6
B1 O
B2
B3
B4
B5
B6
Section 3
ROVPTOV1_OPERATE
ROVPTOV1_START
ROVPTOV2_OPERATE
ROVPTOV2_START
ROVPTOV3_OPERATE
ROVPTOV3_START
ROVPTOV_OPERATE
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