Power Quality Monitoring18
Trend Display
Two ways to access Trend:
1.Use the up/down arrow keys to highlight an event in the table. To access Trend press the ENTER key. The Cursor is on, in the mid of screen and located on the selected event. Zoom is set to 4.
2.Press Function key F4 to view the Trend part showing the most recent measuring values. Cursor and Zoom can be switched on afterwards when required.
Measurement specific features:
•V rms events: an event is recorded each time that a 10 minute aggregated RMS value violates its limits.
•Harmonics events: an event is recorded each time a 10 minute aggregated harmonic or THD violates its limit.
•Flicker events: an event is recorded each time Plt (long term severity) violates its limit.
•Dips/Interruptions/Rapid Voltage Changes/Swells events: an event is recorded each time one of the items violates its limits.
•Unbalance, Frequency events: an event is recorded each time that a 10 minute aggregated RMS value violates its limits.
Trend Display
Figure 18-3. Trend Display
The Trend screen shows the changes over time of measuring values. Zoom and Cursor are available to examine Trend details. Zoom and Cursor are operated by the arrow keys and explained in Chapter 19.
Available function keys:
F1
F2
F3
F5
Assign up/down arrow keys to select a set of Trends for display. The selected set is shown in the screen header.
Cursor on/off.
Assign the arrow keys to Cursor or Zoom operation.
Return to events table.
