In the supervision phase, the switch controller function evaluates the "cause" values from
the switch modules Circuit breaker (SXCBR)/ Circuit switch (SXSWI). At error the
"cause" value with highest priority is shown.
Blocking principles
The blocking signals are normally coming from the bay control function (QCBAY) and
via the IEC 61850 communication from the operator place.
The IEC 61850 communication has always priority over binary inputs,
e.g. a block command on binary inputs will not prevent commands over
IEC 61850.
The different blocking possibilities are:
•
Block/deblock of command. It is used to block command for operation of position.
•
Blocking of function, BLOCK, signal from DO (Data Object) Behavior (IEC 61850).
If DO Behavior is set to "blocked" it means that the function is active, but no outputs
are generated, no reporting, control commands are rejected and functional and
configuration data is visible.
The different block conditions will only affect the operation of this
function, that is, no blocking signals will be "forwarded" to other
functions. The above blocking outputs are stored in a non-volatile
memory.
Interaction with synchronism-check and synchronizing functions
The Switch controller (SCSWI) works in conjunction with the synchronism-check and the
synchronizing function (SESRSYN, 25). It is assumed that the synchronism-check
function is continuously in operation and gives the result to SCSWI. The result from the
synchronism-check function is evaluated during the close execution. If the operator
performs an override of the synchronism-check, the evaluation of the synchronism-check
state is omitted. When there is a positive confirmation from the synchronism-check
function, SCSWI will send the close signal EXE_CL to the switch function Circuit
breaker (SXCBR).
When there is no positive confirmation from the synchronism-check function, SCSWI
will send a start signal START_SY to the synchronizing function, which will send the
closing command to SXCBR when the synchronizing conditions are fulfilled, see
figure
. If no synchronizing function is included, the timer for supervision of the
"synchronizing in progress signal" is set to 0, which means no start of the synchronizing
function. SCSWI will then set the attribute "blocked-by-synchronism-check" in the
"cause" signal. See also the time diagram in figure
Section 12
1MRK 502 048-UUS A
Control
374
Technical manual
