ABB RELION REX640, Technical Manual, Page: 1560 / 1960

9.6.5.1 Energizing check
The Energizing check module checks the energizing direction. Energizing is the
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
Live dead mode.
Live dead mode can be set in two ways: either through settings or through the
command control.
If the
Live dead mode parameter under the Setting menu is set as
"Command", then
Live dead mode Ctl parameter under the Control menu
can be used to select the values in
Table 1515
. Otherwise, the
Live dead
mode parameter under the Setting menu is used to select the values in
Table 1515
.
Table 1515: Live dead mode of operation when switching can be carried out
Live dead mode Description
Off Live dead mode setting is in off status
Both Dead Both bus and generator de-energized
Live G, Dead B Bus de-energized and generator energized
Dead B, G Any Bus de-energized and generator energized or
de-energized
The actual value for defining the dead bus or generator is given with the Dead
voltage value setting. Similarly, the actual values of live bus or generator are defined
with the Live voltage value setting.
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 circuit
breaker 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 operate time, the timer is reset and
the procedure is restarted when the conditions allow it. The circuit breaker does
not close if the measured voltage on the live side is greater than the set value of
Maximum voltage.
The measured energized state is available as a monitored data value ENERG_STATE
and as four function outputs
LBLG
(“Both Live”),
LBDG
(“Live B, Dead G”),
DBLG
(“Dead B, Live G”) and
DBDG
(“Both Dead”), 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.
9.6.5.2 Synchronization check and control
The operation of Synchronization check and control modes can be described with a
module diagram.
Control functions 1MRS759142 F
1560 REX640
Technical Manual