ABB RELION REX640 Technical Manual page 1443

1MRS759142 C
REX640
Technical Manual
TCB ds




360 f s
α
= ⋅ ⋅ +


Lead BusA
 



GUID-931A0DA3-AAB6-4EE6-8743-9BFF06C1967D V1 EN
f Bus A side frequency
BusA
s Frequency slip
ds/dt Frequency slip acceleration
TCB Setting Closing time of CB
The breaker closes only when the measured phase-angle difference across the breaker
(PH_DIFF_MEAS) equals the calculated lead angle (α
check conditions are fulfilled.
If Synchrocheck mode is set to "Synchronous", a zero-passage of the
phase-angle difference is not necessary and CB closing is permitted as
soon as all the synchrocheck conditions are fulfilled. Similarly for
dead bus synchronization, CB closing is possible when the energizing
check permits.
The CB closing signal can be blocked based on the inputs CB_TEST and
EXT_CHECK and IED test mode as described in
available in the monitored data CB_CL_BLKD.
Table 1372: CB_CL_BLKD status based on the inputs
IED test mode Inputs
CB_TEST
TRUE TRUE
FALSE FALSE
TRUE TRUE
FALSE FALSE
TRUE FALSE
FALSE TRUE
ASNSCSYN 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 closing conditions are always considered to be fulfilled by
ASNSCSYN.
Synchronization control


⋅
TCB


2 dt
⋅
 

1000 1000
 



EXT_CHECK
TRUE
FALSE
N/A
N/A
Section 9
Control functions
) and all synchronization
Lead
Table 1372. This blocking status is
Monitored data
CB_CL_BLKD
1("Unblocked")
2("Ext check fail")
3("IED Test, CB
Service")
4("IED Service, CB
Test")
(Equation 337)
1437