12.3.6
Switch controller SCSWI
12.3.6.1
Introduction
The Switch controller (SCSWI) initializes and supervises all functions to properly
select and operate switching primary apparatuses. The Switch controller may handle
and operate on one three-phase device.
12.3.6.2
Principle of operation
The Switch controller (SCSWI) is provided with verification checks for the select -
execute sequence, that is, checks the conditions prior each step of the operation. The
involved functions for these condition verifications are interlocking, reservation,
blockings and synchronism-check.
Control handling
.
Two types of control models can be used. The two control models are "direct with
normal security" and "SBO (Select-Before-Operate) with enhanced security". The
parameter
CtlModel
defines which one of the two control models is used. The control
model "direct with normal security" does not require a select whereas, the "SBO with
enhanced security" command model requires a select before execution.
Normal security means that only the command is evaluated and the resulting position is
not supervised. Enhanced security means that the command sequence is supervised in
three steps, the selection, command evaluation and the supervision of position. Each
step ends up with a pulsed signal to indicate that the respective step in the command
sequence is finished. If an error occurs in one of the steps in the command sequence,
the sequence is terminated and the error is mapped into the enumerated variable
"cause" attribute belonging to the pulsed response signal for the IEC 61850
communication. The last cause L_CAUSE can be read from the function block and
used for example at commissioning.
There is no relation between the command direction and the actual
position. For example, if the switch is in close position it is possible to
execute a close command.
Before an execution command, an evaluation of the position is done. If the parameter
PosDependent
is true and the position is in intermediate state or in bad state no
execution command is sent. If the parameter is false the execution command is sent
independent of the position value.
Section 12
1MRK505222-UUS C
Control
662
Technical reference manual
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