Operation Principle - ABB RELION REX640 Technical Manual

Section 5
Protection related functions
5.8.5
1126
Table 1058: Analog inputs
Input
1)
I3P
2)
U3P
1) Can be connected to GRPOFF if
disabled" or "Voltage"
2) Can be connected to GRPOFF if
disabled" or "Current"
See the preprocessing function blocks in this document for the
possible signal sources. The GRPOFF signal is available in the
function block called Protection.
There are a few special conditions which must be noted with the configuration.
Table 1059: Special conditions
Condition
U3P connected to real measurements
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 CVPSOF can be described by using a module diagram. All the
modules in the diagram are explained in the next sections.
Description
Three-phase currents
Necessary when
"Start"
Three-phase voltages
Necessary when
"Start"
Operation mode is set to "Start" and Automatic SOTF Ini is set to "DLD
Operation mode is set to "Start" and Automatic SOTF Ini is set to "DLD
Description
The function can work with any two phase voltage
channels connected but it is recommended to
connect all three voltage channels.
1MRS759142 C
Operation mode is other than
Operation mode is other than
REX640
Technical Manual