R.8.8
SEL-421 Relay Reference Manual Date Code 20111215
IEC 61850 Communications
IEC 61850 Operation
Datasets
The list of datasets in Figure 8.2 are the defaults for an SEL-421 device.
Figure 8.2 SEL-421 Datasets
Within ACSELERATOR Architect, IEC 61850 datasets have two main
purposes:
➤ GOOSE: You can use predefined or edited datasets, or create
new datasets for outgoing GOOSE transmission.
NOTE: Do not edit the dataset names
used in reports. Changing or deleting
any of those dataset names will cause
a failure in generating the
corresponding report.
➤ Reports: Twelve predefined datasets (DSet01 to DSet12)
correspond to the default six buffered and six unbuffered
reports. Note that you cannot change the number (12) or type of
reports (buffered or unbuffered) within
ACSELERATOR
Architect. However, you can alter the data attributes that a
dataset contains and so define what data an IEC 61850 client
receives with a report.
The SER dataset, CFG.LLN0.SER, is a listing of the predetermined LN data
attributes that are available with SER quality timestamps in the SEL-421.
Modifications to this dataset do not modify which data attributes have SER
quality timestamps. If your application requires SER quality timestamps for
data attributes not in this dataset, contact SEL for possible modification to
your device IEC 61850 default configuration.
LN data attributes listed in the SER dataset have SER accurate timestamps of
1 ms for data change events. All other LN data attributes are scanned on a
1/2-second interval for data change and have 1/2-second timestamp accuracy.
Supplemental
Software
Examine the data structure and values of the supported IEC 61850 LNs with
an MMS browser such as MMS Object Explorer and AX-S4 MMS from
Sisco, Inc.
The settings needed to browse an SEL-421 with an MMS browser are shown
below.
OSI-PSEL (Presentation Selector) 00000001
OSI-SSEL (Session Selector) 0001
OSI-TSEL (Transport Selector) 0001
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