Technical description
3 Supporting functions
3.1 Event log
VM55.EN005
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will be overwritten, when a new event does occur. The shown
resolution of a time stamp is one millisecond, but the actual
resolution depends of the particular function creating the
event. For example most protection stages create 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 3.6 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 3.6)
hh:mm:ss.nnn
Time
