9.2.3 Functionality
The functions DCSXSWI and ESSXSWI indicate remotely and locally the open, close
and undefined states of the disconnector and earthing switch. The functionality
of both is identical, but each one is allocated for a specific purpose visible in
the function names. For example, the status indication of disconnectors or circuit
breaker truck can be monitored with the DCSXSWI function.
The functions are designed according to the IEC 61850-7-4 standard with the logical
node XSWI.
9.2.4 Operation principle
Status indication and validity check
The object state is defined by the two digital inputs POSOPEN and POSCLOSE, which
are also available as outputs OPENPOS and CLOSEPOS together with the OKPOS
according to
Table 980
. The debounces 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 digital inputs that
indicate the object state is used as additional information in indications and event
logging.
Table 980: 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
9.2.5 Application
In the field of distribution and sub-transmission automation, the reliable control
and status indication of primary switching components both locally and remotely
is in a significant role. These features are needed especially in modern remote
controlled substations. The application area of DCSXSWI and ESSXSWI functions
covers remote and local status indication of, for example, disconnectors, air-
break switches and earthing switches, which represent the lowest level of power
switching devices without short-circuit breaking capability.
1MRS757644 H
Control functions
620 series
Technical Manual
995
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