ABB RELION REX640, Technical Manual, Page: 1596 / 1960

The equipment which is capable of voltage and frequency adjustment,
that is, the generator, is referred to as source and the rest as nonsource.
Hence the generator's CB is referred to as source CB and the bus coupler
or tie feeder CB as non-source CB. The non-source CB is not directly
related to a generator although its closing has to be handled using
synchronization.
Bus A2
Non Source CB
Bus A1
Bus A2
Non Source CB
Bus B2
Bus A1
Bus B1
Single busbar arrangement Double busbar arrangement
ISO A1 ISO B1
ISO A2
ISO B2
ISO A1
ISO A2
Figure 873: Different busbar arrangement for a non-source CB
Auto synchronization mode
In this mode, the closing signal is delivered if either the command
Synchronize CB
or the input
CL_COMMAND
is set to TRUE. The device should be in local mode if
synchronization is initiated with the
Synchronize CB command.
If the setting
Auto Syn mode is set as "Manual mode" or "Semi-automatic
synchronising mode", the additional command Manual CB release should be active
for the closing signal
CLOSE_CB
to be activated. If the setting
Auto Syn mode is set
as "Automatic synchronising mode", no additional command is required to activate
the closing signal
CLOSE_CB
.
In this auto synchronization mode, once all the closing conditions are satisfied
within the set
Maximum Syn time, the outputs
SYNC_OK
and
CLOSE_CB
become
TRUE and remain active as long as the closing conditions are fulfilled. If
Multiple
command is set to "Off", then only
CLOSE_CB
outputs are delivered once for
each activated input signal as shown in Figure 874 . If Multiple command is set to
"On", then
CLOSE_CB
outputs are delivered each time the conditions are satisfied
as shown in
Figure 875
. In this auto synchronization mode, once all the closing
conditions are satisfied within the set
Maximum Syn time, the outputs
SYNC_OK
and
CLOSE_CB
become TRUE. These outputs remain active as long as the respective
conditions are fulfilled. If
Multiple command is set to "Off", then only
CLOSE_CB
outputs are delivered only once for each activated input signal as shown in
Figure
874
. If
Multiple command is set to "On", then
CLOSE_CB
outputs are delivered each
time the conditions are satisfied as shown in Figure 875 .
Control functions 1MRS759142 F
1596 REX640
Technical Manual