3.2 Disturbance recorder
3 Supporting functions
Technical description
112
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VM50.EN004
events with 10 ms or 20 ms resolution. The absolute accuracy of
all time stamps depends on the time synchronizing of the relay.
See chapter 3.7 for system clock synchronizing.
Event buffer overflow
The normal procedure is to poll events from the device all the
time. If this is not done, the event buffer will eventually
overflow. On the local screen this is indicated with string
"OVF" after the event code.
Setting parameters for events
Parameter Value Description
Note
Count Number
of
events
ClrEn
Clear
Clear event buffer
Set
Order
Old-
New
New-
Old
Order of the event buffer for local
display
Set
FVSca
PU
Pri
Scaling of event fault value
Per unit scaling
Primary scaling
Set
Display
Alarms
On
Off
Alarm pop-up display is enabled
No alarm display
Set
FORMAT OF EVENTS ON THE LOCAL DISPLAY
Code: CHENN
CH = event channel, NN=event code
Event description
Event channel and code in plain text
yyyy-mm-dd Date
(for
available date formats see chapter 3.7)
hh:mm:ss.nnn Time
3.2.
Disturbance recorder
The disturbance recorder can be used to record all the
measured signals, that is, currents, voltages and the status
information of digital inputs (DI) and digital outputs (DO). The
digital inputs include also the arc protection signals S1, S2, BI
and BO, if the optional arc protection is available.
Triggering the recorder
The recorder can be triggered by any start or trip signal from
any protection stage or by a digital input. The triggering signal
is selected in the output matrix (vertical signal DR). The
recording can also be triggered manually. All recordings are
time stamped.