ABB REC650 Applications Manual page 223

1MRK 511 286-UUS A
Application manual
• Local/Remote switch intended for the switchyard
• Block/deblock for open/close command respectively
• Update block/deblock of position indication
• Substitution of position indication
• Supervision timer that the primary device starts moving after a command
• Supervision of allowed time for intermediate position
• Definition of pulse duration for open/close command respectively
The realization of this function is performed with SXCBR representing a circuit breaker
and with SXSWI representing a circuit switch that is, a disconnector or an grounding
switch.
The content of this function is represented by the IEC 61850 definitions for the logical
nodes Circuit breaker (SXCBR) and Circuit switch (SXSWI) with mandatory
functionality.
Reservation function (SELGGIO)
The purpose of the reservation function is to grant permission to operate only one device
at a time in a group, like a bay or a station, thereby preventing double operation.
For interlocking evaluation in a substation, the position information from switching
devices, such as circuit breakers, disconnectors and grounding switches can be required
from the same bay or from several other bays. When information is needed from other
bays, it is exchanged over the serial station bus between the distributed IEDs. The problem
that arises, even at a high speed of communication, is a time interval during which the
information about the position of the switching devices are uncertain. The interlocking
function uses this information for evaluation, which means that also the interlocking
conditions will be uncertain.
To ensure that the interlocking information is correct at the time of operation, a reservation
method is available in the IEDs. With this reservation method the reserved signal can be
used for evaluation of permission to select and operate the apparatus.
This functionality is realized over the station bus by means of the function block
SELGGIO.
The SELECTED output signal from the respective SCSWI function block in the own bay
is connected to the inputs of the SELGGIO function block. The output signal RESERVED
from SELGGIO is connected to the input RES_EXT of the SCSWI function block. If the
bay is not currently reserved, the SELGGIO output signal RESERVED is FALSE.
Selection for operation on the SCSWI block is now possible. Once any SCSWI block is
selected, and if its output SELECTED is connected to the SELGGIO block, then other
SCSWI functions as configured are blocked for selection. The RESERVED signal from
SELGGIO is also sent to other bay devices.
Section 10
Control
217