ABB RELION REX640 Technical Manual page 1444

Section 9
Control functions
1438
The general bus bar arrangement for a non-source CB bus is shown in
bus to which the generator is connected is determined based on the CB and isolator
position inputs (CB_OPEN, CB_CLOSE, ISO_A1_CLOSE, ISO_A2_CLOSE,
ISO_B1_CLOSE and ISO_B2_CLOSE). The generator's bus connection status is
shared with ASCGAPCs as part of the NS_ASC_DAT output.
The equipment which is capable of voltage and frequency adjustment,
that is, the generator, is referred to as source and the rest as non-
source. Hence the generator's CB is referred to as source CB and the
bus coupler or tie feeder CB as non-source CB.
Bus A1
Non Source CB
Bus A2
Single busbar arrangement
GUID-E74B7858-9BE9-4CD5-B030-13811630AD46 V1 EN
Figure 769: 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
initiation Synchronize CB is given for synchronization.
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
Bus A1
ISO A1
ISO A1
Non Source CB
ISO A2
ISO A2
Bus A2
1MRS759142 C
Figure
Bus B1
Double busbar arrangement
Technical Manual
769. The
ISO B1
ISO B2
Bus B2
REX640