ABB Relion 630 Series Communication Protocol Manual

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Contents

ABB Relion 630 Series Communication Protocol Manual Manual pdf 36 page image

• All data objects or their data attributes which are signals in monitoring directioncan be selected for a data set.• Only those data attributes of a data object can/will be selected which have thesame function constraint (FC).• Data objects with different FC can be selected for a data set. For example, DOswith FC = ST and DOs with FC=MX can be member in one data set.• A single data attribute can be selected when it is specified with a trigger option.For example, the data attribute stVal of the data object Pos can be selected as amember of a data set, because it is specified with the trigger option data changedetected (dchg).The description of the data sets with name and the list of data object members (FCDAsis included in the SCL file in the IED section in the Logical device subsection. Asspecified in IEC 61850-7-2 clause 9, the data sets are part of a logical node. They aremost likely included in the LLN0.6.2 Report control block (URCB/BRCB)To be able to transmit the signals configured in a data set, a report control block mustbe configured to handle and specify how the events are transmitted to the clients.There are two types of report control blocks; unbuffered and buffered. The bufferedreport control block stores the events during a communication interrupt, while theunbuffered is sent upon data change and not stored during interruption.The content of a BRCB is listed in IEC 61850-7-2 in clause 14. The BRCB containsmany attributes which are of interest to handle and secure the communication betweenthe client and the server and may be set once as default in a project. Others are ofapplication interest in the way events are handled in a project.• Buffer time (valid only for BRCB)• This parameter describes how long the report should wait for otherexpected events before it sends the report to the client. When it is known,that additional events are generated as a follow up, it is useful to wait, forexample, 500 ms for additional events stored in the report. This featurereduces the number of telegrams transmitted in case of a burst of changes.But on the other side it increases the overall transaction time for events fromIED input to presentation on HMI, which is normally defined to be onesecond.• Trigger options• The data attributes know three different trigger options (dchg, qchg, dupd).Within the BRCB, the two other can be defined (integrity and generalinterrogation). The attribute Trigger option is a multiple choice and allowsto mask the supported trigger options in this BRCB.• Integrity period• When integrity is selected in the trigger option attribute, it is needed todefine an integrity period to force the transmission of all data listed in theSection 6 1MRS756793 EData sets and control blocks30 630 seriesCommunication Protocol Manual