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.
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 601: Status indication
State
OPEN CLOSE
Open ON OFF
Close OFF ON
Bad/Faulty 11 ON ON
Intermediate 00 OFF OFF
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.
9.2.6 Signals
Table 602: DCSXSWI Input signals
Name
Type Default Description
POSOPEN BOOLEAN 0=False
Signal for open position of apparatus from I/O
1)
POSCLOSE BOOLEAN 0=False
Signal for closed position of apparatus from I/O
1)
1) Not available for monitoring
1YHT530004D05 D Section 9
Control functions
615 series 677
Technical Manual
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