9.1.3
Functionality
CBXCBR, DCXSWI and ESXSWI are intended for circuit breaker, disconnector and
earthing switch control and status information purposes. These functions execute
commands and evaluate block conditions and different time supervision conditions.
The functions perform an execution command only if all conditions indicate that a
switch operation is allowed. If erroneous conditions occur, the functions indicate an
appropriate cause value. The functions are designed according to the IEC 61850-7-4
standard with logical nodes CILO, CSWI and XSWI/XCBR.
The circuit breaker, disconnector and earthing switch 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 the 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
. 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 961: 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, DCXSWI and ESXSWI 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
1MRS757644 H
Control functions
620 series
Technical Manual
983
