ABB RELION REX640 Technical Manual page 1414

Section 9
Control functions
1408
Synchronization control
The general bus bar arrangement for a generator bus is shown in
to which the generator is connected is determined based on the circuit breaker and
isolator position inputs (GCB_OPEN, GCB_CLOSE, ISO_A_CLOSE and
ISO_B_CLOSE). The generator's bus connection status is shared with the
autosynchronizer co-ordinator function ASCGAPC as part of the GEN_ASC_DATA
output.
G
Gen CB
ISO A
Bus A
Single busbar arrangement
GUID-872723C9-F335-4E94-A3B6-AB1FD7308B67 V1 EN
Figure 753: Different bus bar arrangements for a generator bus
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 relay should be in the 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
outputs are delivered each time the conditions are satisfied as shown in
ISO A
Bus A
Double busbar arrangement
754. If Multiple command is set to "On", then CLOSE_CB
1MRS759142 C
Figure 753. The bus
G
Gen CB
ISO B
Bus B
Figure
Technical Manual
755.
REX640