Operation Principle - ABB RELION REX640 Technical Manual

Section 4
Protection functions
4.7.1.5
862
Table 826: Analog inputs
Input
I3P
1)
I3P_PAR
2)
I3P_REF
U3P
3)
URES
1) Can be connected to GRPOFF if
2) Can be connected to GRPOFF if
3) Can be connected to GRPOFF if
Meas is set to "Ph-to-ph without Uo"
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 827: 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 function consists of sub-functions which are described in the next sections.
Description
Three-phase currents
Three-phase currents
Necessary when
True
Three-phase currents
Necessary when
"Io AND IoRef"
Three-phase voltages
Residual voltage (measured)
Necessary when
"Io OR Uo" or "Io AND Uo". Necessary also if only
main voltages are available but
Meas is set to "Accurate".
Par line Comp zone x is set to False.
EF detection Mod GFC is not set to "Io AND IoRef"
EF detection Mod GFC is set to "Io" or "Io AND IoRef" or Phase voltage
Description
The function can work with any two phase voltage
channels connected but it is recommended to
connect all three voltage channels.
1MRS759142 C
Par line Comp zone x is set to
EF detection Mod GFC is set to
EF detection Mod GFC is set to
Phase voltage
REX640
Technical Manual