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GUID-FE089DD8-D0A0-4D3B-9287-48B11ADBAC25 V1 EN
Figure 445:
Functional module diagram
Communication supervision
The protection communication is supervised because the differential calculation is
dependent on the refreshing of new analog phasor samples from the remote terminal
within the protection telegram. The new protection telegram also updates the status of the
binary signals sent by the remote terminal. The calculation of the differential current is
based on comparing the remote and local terminal measured current samples. It is
therefore essential that the protection communication telegrams are supervised and the
result of the sample latency calculation can be used further in the differential current
calculation. When the communication is able to receive telegrams correctly from the
remote end via the communication media, the communication is assumed to be operating
correctly and the
COMM
output is kept active.
Communication interference detector
The communication interference detector is continuously measuring and observing the
sample latency of the protection telegrams. This value is also available as monitored data.
The function provides three output signals of which only the corresponding one is active
at a time depending on if the protection communication supervision is in
OK
,
WARNING
or
ALARM
. The
OK
state indicates the correct operation of the protection. The
WARNING
state indicates that the protection is internally blocked due to detected interference. The
WARNING
state is switched to
ALARM
if the interference lasts for a longer period. The
protection communication supervision can sometimes be in the
WAITING
state. This state
indicates that the terminal is waiting for the communication to start or restart from the
remote end terminal.
Timer
Once activated with the
WARNING
signal, the timer has a constant time delay value of five
seconds. If the communication failure exists after the delay, the
ALARM
output is
activated.
1MAC059074-MB A
Section 6
Supervision functions
615 series ANSI
863
Technical Manual
Содержание Relion 615 series
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