Analog Channel Configuration; Operation Principle - ABB RELION REX640 Technical Manual

1MRS759142 C
4.5.3.4
4.5.3.5
REX640
Technical Manual
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.

Analog channel configuration

ROVPTOV has one analog group input which must be properly configured.
Table 727: Analog inputs
Input
URES
See the preprocessing function blocks in this document for the
possible signal sources.
There are a few special conditions which must be noted with the configuration.
Table 728: Special conditions
Condition
URES calculated
Improper analog channel configuration causes a validation error if the analog
channels are not completely configured or they do not match with certain settings. For
troubleshooting, check the contents of this chapter and also the preprocessing blocks
in this document. The configuration can be written to the protection relay once the
mismatch is corrected.

Operation principle

The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of ROVPTOV can be described by using a module diagram. All the
modules in the diagram are explained in the next sections.
Protection functions
Description
Residual voltage (measured or calculated)
Description
The function requires that all three voltage
channels are connected to calculate residual
VT connection must be "Wye" in
voltage. Setting
that particular UTVTR.
Section 4
783