If no frames are received during 2xTAL, that is, if at least two consecutive frames
are lost, the receiver defines the quality of the whole received data set as "bad" and
sets the input value to the default, that is, to fail-safe. Consider this when designing
the application. For example, the IEDs should use an enabling signal for
interlocking purposes, and a blocking-type signal for protection purposes. By this
way, a fail-safe functionality is ensured.
5.5.2
Default value handling
The information is of point-to-point type which means that there is only one signal
connected to the function block input. The default value of the input, FALSE (0), is
taken into use when there is a communication error on the receiver side. If one IED
application function block input receives several signals from several IEDs, the
input value is calculated in OR or AND operation from several inputs. In this case,
one default signal is treated as logical FALSE (0), but the other signals can keep
the function block input value active. It works similarly as copper cables connected
between IEDs having no detection of single data loss. In all cases, however, a
separate alarm event is always generated by the GSEGGIO1.Alm data object for
IEC 61850 event clients.
GSEGGIO1.Alm can also be used on the application side as an input in the Signal
Matrix Tool's Binary Outputs sheet (signal GSEGGIO ALARM). Thereby it is
possible to, for example, change the setting group in case one or several IEDs are
disconnected from the network.
5.5.3
Alarm supervision in application
In a communication time-out situation, all the peer IEDs receive information about
the problem. The system does not tolerate single failures or non-existing devices,
for example, in service situations. Take this into account when designing an
application.
Disable GOOSE sending by writing “false” from IEC 61850 clients
to the GoEna attribute under the GOOSE control block. Use this
feature carefully, and for test purposes only.
5.5.4
Diagnostic counters
The IEC 61850 data model of the 615 series IEDs includes a logical node
LD0.GSEGGIO1 for the GOOSE communication diagnostic. The counters are also
available via the HMI or PCM600 path
Monitoring/I/O Status/Communication/
GSEGGIO1
.
It is possible to reset the counters via
Monitoring/I/O Status/Communication/
GSEGGIO1/Monitoring/Reset counters
and via the IEC 61850 communication
by writing
True
to the GSEGGIO1.RstCnt.Oper.ctlVal data attribute.
Section 5
1MRS757255 B
GOOSE
38
Breaker Integrated Protection RBX615
Engineering Guide