ABB RELION REX640 Technical Manual page 1409

1MRS759142 C
REX640
Technical Manual
ENERG_STATE From
Energizing check
U_A_AB
U_B_BC
U3P1
U_C_CA
U_A_AB
U3P2
BYPASS
BLOCK
CB_TEST
EXT_CHECK
CL_COMMAND
CB_CLOSE
CB_OPEN
ISO_A_CLOSE
ISO_B_CLOSE
GUID-91D4AEFA-149A-42D4-B33B-FB336D43A5E6 V2 EN
Figure 751: Module diagram for Synchronization check and control
Synchro check
The function measures the voltage difference U_DIFF_MEAS, frequency difference
FR_DIFF_MEAS and phase angle difference PH_DIFF_MEAS between the bus
voltage and generator voltage. In the calculation of PH_DIFF_MEAS, setting Phase
shift is used to compensate the angle shift caused if a power transformer is located
between the voltage measurements. Offset correction due to different channel
measurements (for voltage and frequency values) can be done using Voltage offset and
Frequency offset. The user can select the direction of generator synchronization using
the setting Synchronization Dir.
U DIFF MEAS _ _ U
=
Gen
GUID-0F22C877-045C-4FFB-BE14-196987D69A2C V1 EN
U Measured bus side voltage
Bus
U Measured generator side voltage
Gen
Voltage offset
Voltage offset Setting
FR DIFF MEAS f
_ _
=
Gen
GUID-074F54CB-5A02-4676-B182-E51BD97941E6 V1 EN
f Measured bus side frequency
Bus
f Measured generator side frequency
Gen
Frequency offset
Frequency offset Setting
Synchro
check
Close CB
condition
U Voltage offset
− −
Bus
f Frequency offset
− −
Bus
Section 9
Control functions
MATCH_INPRO
MATCH_OK
CL_FAIL_AL
Alarms
CMD_FAIL_AL
generation
SYNC_INPRO
Synchroni-
SYNC_OK
zation
control CLOSE_CB
(Equation 318)
(Equation 319)
1403