ABB RELION REX640 - Synchronization control

The monitored data CB_CL_BLKD depends on the inputs GCB_TEST and EXT_CHECK,
and also on IED test mode as described in Table 1518 . CB_CL_BLKD is available in the
Monitored data view.
Table 1518: Monitored data CB_CL_BLKD activation based on the inputs
IED test mode Inputs Monitored data
GCB_TEST EXT_CHECK CB_CL_BLKD
TRUE TRUE TRUE 1 (“Unblocked”)
FALSE FALSE
TRUE TRUE FALSE 2 (“Ext Check Fail”)
FALSE FALSE
TRUE FALSE N/A 3 (“IED Test CB Serv-
ice”)
FALSE TRUE N/A 4 (“IED Service CB
Test”)
The close CB condition is blocked if the CB_CL_BLKD status is 2(“Ext Check Fail”),
3(“IED Test CB Service”) or 4(“IED Service CB Test”).
In case for BYPASS input activation,
• If GCB_TEST is activated, CLOSE_CB is activated.
• If GCB_TEST is deactivated, and the bus and generator terminal voltages are both
live or one side live, CLOSE_CB is not activated.
Synchronization control
The general bus bar arrangement for a generator bus is shown in
Figure 857 .
The bus 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.
Bus A
Gen CB
Bus B
G
Bus A
Gen CB
Single busbar arrangement Double busbar arrangement
ISO A
ISO B
ISO A
G
Figure 857: Different bus bar arrangements for a generator bus
1MRS759142 F
Control functions
REX640
Technical Manual
1565