check. The input ITL_BYPASS can be used for bypassing ENA_CLOSE input, while the
SYNC_BYPASS can be used for bypassing SYNC_OK input. However, the BLK_CLOSE
input always blocks the CLOSE_ENAD output. The CB opening (OPEN_ENAD) logic is
the same as CB closing logic, except that SYNC_OK and SYNC_BYPASS are used only
in closing.
The CB opening ( OPEN_ENAD) logic is the same as CB closing logic, except
that SYNC_OK is used only in closing. The SYNC_ITL_BYP input is used in both
CLOSE_ENAD and OPEN_ENAD logics.
AND
OR
OR AND
ENA_CLOSE
ITL_BYPASS
SYNC_OK
BLK_CLOSE
CLOSE_ENAD
ENA_OPEN
ITL_BYPASS
OPEN_ENAD
BLK_OPEN
SYNC_BYPASS
OR
AND
Figure 824: Enabling and blocking logic for CLOSE_ENAD and OPEN_ENAD signals
Disconnector control DCXSWI and earthing switch control ESXSWI
Normally, the switch closing is enabled (that is, the CLOSE_ENAD signal is TRUE) by
activating the ENA_CLOSE input. The input ITL_BYPASS can be used for bypassing
this control. The ITL_BYPASS input can be used to activate the CLOSE_ENAD
discarding the ENA_CLOSE input state. However, the BLK_CLOSE input always blocks
the CLOSE_ENAD output.
The CB opening ( OPEN_ENAD) logic is identical to CB closing logic. The ITL_BYPASS
input is used in both CLOSE_ENAD and OPEN_ENAD logics.
1MRS759142 F
Control functions
REX640
Technical Manual
1507
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