ABB RELION REX640 Technical Manual page 1393

1MRS759142 C
REX640
Technical Manual
U3P1
U3P2
CL_COMMAND
BYPASS
BLOCK
GUID-366B7CC9-2B70-4A02-879E-FB7E99236C60 V1 EN
Figure 739: Functional module diagram
If Energizing check is passed, no further conditions need to be fulfilled to permit
closing. Otherwise, Synchro check function can operate either with the U_AB or U_A
voltages. The selection of used voltages is defined with the VT connection setting of
the line voltage general parameters.
By default, voltages U_BUS and U_LINE are connected as presented
in Figure
Voltage source switch to "True".
Energizing check
The Energizing check function checks the energizing direction. Energizing is defined
as a situation where a dead network part is connected to an energized section of the
network. The conditions of the network sections to be controlled by the circuit
breaker, that is, which side has to be live and which side dead, are determined by the
setting. A situation where both sides are dead is possible as well. The actual value for
defining the dead line or bus is given with the Dead bus value and Dead line value
settings. Similarly, the actual values of live line or bus are defined with the Live bus
value and Live line value settings.
Table 1344: Live dead mode of operation under which switching can be carried out
Live dead mode
Both Dead
Live L, Dead B
Dead L, Live B
Dead Bus, L Any
Dead L, Bus Any
One Live, Dead
Not Both Live
U_A
U_B
Energizing
U_C
check
U_A_AB
Synchro
check
748. If necessary, connections can be switched by setting
Description
Both line and bus de-energized
Bus de-energized and line energized
Line de-energized and bus energized
Both line and bus de-energized or bus de-
energized and line energized
Both line and bus de-energized or line de-
energized and bus energized
Bus de-energized and line energized or line de-
energized and bus energized
Both line and bus de-energized or bus de-
energized and line energized or line de-energized
and bus energized
Section 9
Control functions
LLDB
LLLB
DLLB
DLDB
SYN_INPRO
SYNC_OK
CMD_FAIL_AL
CL_FAIL_AL
1387