ABB RELION REX640 Technical Manual page 1413

1MRS759142 C
REX640
Technical Manual
(α ) by which the close CB command is shifted forward in time so that the main
Lead
contacts close on phase coincidence.
TCB ds




f s
360
α
= ⋅ ⋅ +


Lead Bus
 



GUID-845029C1-A935-4AD2-8CDB-A0946E0AA334 V1 EN
f Bus side frequency
Bus
s Frequency slip
ds/dt Frequency slip acceleration
TCB Setting Closing time of CB
ASGCSYN can be set to the bypass mode by setting the parameters
Synchrocheck mode and Live dead mode to "Off" or, alternatively, by
activating the BYPASS input. In the bypass mode, the close CB
conditions are always fulfilled. Otherwise, the operation is similar to
the normal mode.
The monitored data CB_CL_BLKD depends on the inputs GCB_TEST and
EXT_CHECK, and also on IED test mode as described in
is available in the Monitored data view.
Table 1358: Monitored data CB_CL_BLKD activation based on the inputs
IED test mode Inputs
GCB_TEST
TRUE TRUE
FALSE FALSE
TRUE TRUE
FALSE FALSE
TRUE FALSE
FALSE TRUE
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.


⋅
TCB


2 dt
⋅


1000 1000  




EXT_CHECK
TRUE
FALSE
N/A
N/A
Section 9
Control functions
(Equation 324)
Table 1358. CB_CL_BLKD
Monitored data
CB_CL_BLKD
1("Unblocked")
2("Ext Check Fail")
3("IED Test CB
Service")
4("IED Service CB
Test")
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