Energizing
check
Synchro
check
Figure 524: 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
. If necessary, connections can be switched by setting
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 993:
Live dead mode of operation under which switching can be carried out
Live dead mode
Description
Both Dead
Both line and bus de-energized
Live L, Dead B
Bus de-energized and line energized
Dead L, Live B
Line de-energized and bus energized
Dead Bus, L Any
Both line and bus de-energized or bus de-
energized and line energized
Dead L, Bus Any
Both line and bus de-energized or line de-
energized and bus energized
Table continues on the next page
Control functions
1MRS757644 H
1000
620 series
Technical Manual
