9.1.3 Functionality
The 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 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
information. 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 586: Status indication
Status (POSITION)
POSOPEN/OPENPOS POSCLOSE/
CLOSEPOS
OKPOS
1=Open 1=True 0=False 1=True
2=Closed 0=False 1=True 1=True
3=Faulty/Bad (11) 1=True 1=True 0=False
0=Intermediate (00) 0=False 0=False 0=False
Blocking
CBXCBR, DCXSWI and ESXSWI have a blocking functionality to prevent human
errors that can cause injuries to the operator and damages to the system components.
The basic principle for all blocking signals is that they affect the commands of
other clients: the operator place and protection and autoreclosing functions, for
example. There are two blocking principles.
Section 9 1YHT530004D05 D
Control functions
668 615 series
Technical Manual
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