Operation Principle - ABB RELION REX640 Technical Manual

1MRS759142 C
3.20.17.5
Table 242: Switching operation
Control input signals
SWITCH_TO SWITCH_TO
2 3
FALSE FALSE
TRUE FALSE
TRUE
1)
x
1) 1)
x x
1) No difference
REX640
Technical Manual
Table 241: Analog inputs
Input
1)
I3P1
1)
I3P2
1)
I3P3
I3P4 1)
1)
IRES1
1)
IRES2
IRES3 1)
1)
IRES4
1) Can be connected to GRPOFF
See the preprocessing function blocks in this document for the
possible signal sources. The GRPOFF signal is available in the
function block called Protection.

Operation principle

The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "on" and "off".
For this function, the setting is hidden and fixed to "on".
The switch logic depends on inputs SWITCH_TO2, SWITCH_TO3 and
SWITCH_TO4. Source 1 is selected as default and switching is done on increased
priority.
GRPOFF signal must be connected to unused current inputs. GRPOFF
signal is available as output from the Protection function block.
Outputs
SWITCH_TO SOURCE1
4
FALSE TRUE
FALSE FALSE
FALSE FALSE
TRUE FALSE
Description
Three-phase currents
Three-phase currents
Three-phase currents
Three-phase currents
Residual current (measured or calculated)
Residual current (measured or calculated)
Residual current (measured or calculated)
Residual current (measured or calculated)
SOURCE2 SOURCE3
FALSE FALSE
TRUE FALSE
FALSE TRUE
FALSE FALSE
Section 3
Basic functions
SOURCE4 Source for I3P Source for
FALSE I3P1
FALSE I3P2
FALSE I3P3
TRUE I3P4
IRES
IRES1
IRES2
IRES3
IRES4
257