Table 1529: Live dead mode of operation when switching can be carried out
Live dead mode Description
Command The
Live dead mode
setting uses
Live dead mode Ctl
control
command.
Off
Live dead mode
is set to "Off".
Both Dead Both Bus A and Bus B de-energized
Live B, Dead A Bus B energized and Bus A de-energized
Dead B, Live A Bus B de-energized and Bus A energized
Dead A , B Any Bus A de-energized and Bus B energized or deenergized
Dead B, A Any Bus B de-energized and Bus A energized or deenergized
One Live, Dead Bus A de-energized and Bus B energized or Bus B de-ener-
gized and Bus A energized
Not Both Live Both Bus A and B de-energized or Bus A deenergized and Bus
B energized or Bus B deenergized and Bus A energized
When the energizing direction corresponds to the settings, the situation has to be
constant for a time set with the
Energizing time
setting before the CB closing is
permitted. This time delay ensures that the dead side remains de-energized and
that the situation is not caused by a temporary interference. If the conditions do
not persist for a specified operation time, the timer is reset and the procedure
is restarted when the conditions allow it. The CB does not close if the measured
voltage on the live side is greater than the set value of
Max energizing V
.
The measured energized state is available as a monitored data value ENERG_STATE
and as four function outputs LADB (live bus A and dead bus B), LALB (live bus A and
live bus B), DALB (dead bus A and live bus B) and DADB (dead bus A and dead bus B),
of which only one can be active at a time. The measured energized state indicates
“Unknown” if at least one of the measured voltages is between the limits set with
the dead and live setting parameters.
9.7.5.2 Synchronization check and control
The operation of Synchronization check and control can be described with a module
diagram. All the modules in the diagram are explained in the next sections.
Control functions
1MRS759142 F
1590 REX640
Technical Manual
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