value. The functions are designed according to the IEC 61850-7-4 standard with
logical nodes CILO, CSWI and XSWI/XCBR.
The circuit breaker and disconnector control functions have an operation counter
for closing and opening cycles. The counter value can be read and written remotely
from the place of operation or via LHMI.
9.1.4 Operation principle
Status indication and validity check
The object state is defined by two digital inputs, POSOPEN and POSCLOSE, which
are also available as outputs OPENPOS and CLOSEPOS together with the OKPOS
according to
Table 647
. The debouncing and short disturbances in an input are
eliminated by filtering. The binary input filtering time can be adjusted separately
for each digital input used by the function block. The validity of the digital inputs
that indicate the object state is used as additional information in indications and
event logging. The reporting of faulty or intermediate position of the apparatus
occurs after the
Event delay
setting, assuming that the circuit breaker is still in a
corresponding state.
Table 647: Status indication
Input Status Output
POSOPEN POSCLOSE POSITION
(Monitored
data)
OKPOS OPENPOS CLOSEPOS
1=True 0=False 1=Open 1=True 1=True 0=False
0=False 1=True 2=Closed 1=True 0=False 1=True
1=True 1=True 3=Faulty/Bad
(11)
0=False 0=False 0=False
0=False 0=False 0=Intermedi-
ate (00)
0=False 0=False 0=False
Enabling and blocking
CBXCBR and DCXSWI have an enabling and blocking functionality for interlocking
and synchrocheck purposes.
Circuit breaker control CBXCBR
Normally, the CB closing is enabled (that is, CLOSE_ENAD signal is TRUE)
by activating both ENA_CLOSE and SYNC_OK inputs. Typically, the ENA_CLOSE
comes from the interlocking, and SYNC_OK comes from the synchronism and
energizing check. The input SYNC_ITL_BYP can be used for bypassing this control.
The SYNC_ITL_BYP input can be used to activate CLOSE_ENAD discarding the
ENA_CLOSE and SYNC_OK input states. 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 is used only in closing. The SYNC_ITL_BYP input is used in both
CLOSE_ENAD and OPEN_ENAD logics.
Control functions
1MRS758755 C
628 REC615 & RER615
Technical Manual
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