Functionality; Operation Principle - ABB RELION SMU615 Technical Manual

Control functions
8.1.3

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.
8.1.4

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
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
corresponding state.
Table 256: Status indication
Input
POSOPEN
1=True
0=False
1=True
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
230
Table 256
. The debouncing and short disturbances in an input are
Event delay setting, assuming that the circuit breaker is still in a
Status
POSCLOSE POSITION
(Monitored
data)
0=False 1=Open
1=True 2=Closed
1=True 3=Faulty/Bad
(11)
0=False 0=Intermedi-
ate (00)
Output
OKPOS OPENPOS
1=True 1=True
1=True 0=False
0=False 0=False
0=False 0=False
1MRS758407 C
CLOSEPOS
0=False
1=True
0=False
0=False
SMU615
Technical Manual