ABB RELION REX640 Technical Manual page 1463

1MRS759142 C
REX640
Technical Manual
U_DIFF_1
. .
. .
U_DIFF_17
FR_DIFF_1
. .
. .
FR_DIFF_17
BLOCK
Topology info
From Topology determination
SRC1_ASC_DAT
. .
. .
SRC8_ASC_DAT
NS1_ASC_DAT
. .
. .
NS17_ASC_DAT
GUID-6151565B-A36B-4C5C-8ED3-3576627E5B46 V1 EN
Figure 783: Module diagram of Coordinator
Voltage and frequency difference logic
This module sends the voltage and frequency difference values received from the
NSCB to be synchronized to all the sources with appropriate sign according to the
topology.
Of the two busbars connected across any NSCB, the voltage
transformer (VT) from the lower-number busbar should be connected
to bus A voltage channel (U_BUS_A) and the other to bus B voltage
channel (U_BUS_B).
If these VT connections are interchanged physically, then the correction can be done
in function using NonSrc1 VT Conn...NonSrc17 VT Conn for NSCB 1...NSCB 17.
When the coordinator is active and NSCB 1 is selected for synchronization, the
corresponding voltage and frequency difference inputs U_DIFF_1 and FR_DIFF_1
are available as outputs U_DIFF and FR_DIFF, respectively, with their sign adjusted
according to the setting NonSrc1 VT Conn. If set as "No Change", the sign of U_DIFF
and FR_DIFF remains the same. If set as "Reverse", the sign is reversed. Similarly,
when any of the NSCB 2...NSCB 17 is selected for synchronization, the
corresponding inputs U_DIFF_2...U_DIFF_17 and FR_DIFF_2...FR_DIFF_17
are passed as the outputs U_DIFF and FR_DIFF, respectively.
The output AS_CONFLICT is active in any of the following conditions:
• If more than one NSCB are selected for synchronization at the same time.
• If a NSCB is selected for synchronization while source synchronization is in
progress.
• If more than one source are in synchronization.
Voltage and
AS_CONFLICT
frequency
U_DIFF
difference
FR_DIFF
logic
ASC_NS1_DAT
ASC_NS2_DAT
ASC_NS3_DAT
Source
ASC_SRC1_DAT
selection
. .
. .
logic
ASC_SRC8_DAT
Section 9
Control functions
1457