•
When integrity is selected in the trigger option attribute, it is needed to define
an integrity period to force the transmission of all data listed in the DataSet.
This is done by the attribute Integrity period. This feature can be used as a
background cycle to ensure that the process image in all partners is the same.
The background cycle can repair a lost event in the chain from the NCC to an
IED.
•
General interrogation
•
A general interrogation is only done on request from a client. Not all Data-sets
may contain information which is needed for a general update of the client. For
example data with T(ransient) = TRUE are not part of a GI. When the BRCB
attribute general interrogation is set to TRUE a GI request from the client will
be handled. The report handler will transmit all data defined in the Data-set with
their actual values. The IEC 61850 standard defines that all buffered events
shall be transmitted first before the GI is started. A running GI shall be stopped
and a new GI shall be started, when a new GI request is received while a GI is
running.
•
Purge buffer (valid only for BRCB)
•
This BRCB attribute can be used by a client to clean the event buffer from old
events. The events are discarded on request of the client. This feature can be
used to delete old events not transmitted to the client due to stopped
communication. After the link is reestablished the client can decide to clean the
buffer or to receive the history.
Trigger Options
IEC 61850 has defined in total five different TrgOp. Three of them belonging to data
attributes and marked per data attribute in the column TrgOp of the CDC tables in part 7–
3. The other two belonging to the configuration of control blocks.
•
dchg = data-change
•
Whenever a process value has changed its value either binary or a measurement
a transmission is done.
•
qchg = quality change
•
Looking to the possibilities of the quality data attribute type (q) any changes in
the quality description will be transmitted.
•
dupd = data value update
•
This trigger option give the possibility to define that a transmission should be
done on a condition which can be controlled by the application.
•
integrity
1MRK 511 281-UUS A
Section 6
Data sets and control blocks
650 series ANSI
41
Communication protocol manual
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