F.9
Date Code 20170814
Instruction Manual
SEL-700G Relay
IEC 61850 Communications
IEC 61850 Operation
The time stamp is applied to all data and quality attributes (Boolean, Bstrings,
Analogs, etc.) in the same fashion when the relay detects a data or quality
change. However, there is a difference in how the relay detects the change
between the different attribute types. For points that are assigned as SER
points, that is, programmed in the SER report, the relay detects the change as
the receipt of an SER record (which contains the SER time stamp) within the
relay.
For all other Booleans or Bstrings, the relay detects the change via the
scanner, which compares the last state against the previous state to detect the
change. For analogs, the scanner looks at the amount of change relative to the
dead band configured for the point to indicate a change and apply the time
stamp. In all cases, these time stamps are used for the reporting model.
Functionally Constrained Data Attributes mapped to points assigned to the
SER report have 4 ms SER-accurate time stamps for data change events. To
ensure that you get SER-quality time stamps for changes to certain points, you
must include those points in the SER report. All other FCDAs are scanned for
data changes on a 1/2-second interval and have 1/2-second time-stamp
accuracy. See the SET R command for information on programming the SER
report.
The SEL-700G uses GOOSE quality attributes to indicate the quality of the
data in its transmitted GOOSE messages. Under normal conditions, all
attributes are zero, indicating good quality data. Figure F.3 shows the GOOSE
quality attributes available to devices that subscribe to GOOSE messages from
SEL-700G datasets that contain them. Internal status indicators provide the
information necessary for the device to set these attributes.
For example, if the device becomes disabled, as shown via status indications
(for example, an internal self-test failure), the SEL-700G sets the Validity
attribute to invalid and the Failure attribute to TRUE. Note that the SEL-700G
does not set any of the other quality attributes. These attributes always indicate
FALSE (0). See the
AC
SEL
ERATOR
Architect online help for additional
information on GOOSE Quality attributes.
Figure F.3
GOOSE Quality
Содержание SEL-700G Series
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