Contrel EMA-D6, Instruction Manual, Page: 5 / 22

pag. 5 / 22
Harmonic analysis page (optional)
- The EMA-D6 provides the harmonic analysis up to 63 rd order of the following measurements:
•
phase-to-phase voltages
• phase-to-neutral voltages
•
currents
- For each of these measurements, there is a display page that graphically represents the harmonic content using a bar graph.
- Every column is related to one harmonic order, even and odd.
- Every display page is related to each phase L1, L2, L3.
- The value of the harmonic content is expressed as a percentage.
- It is possible to show the harmonic content in numeric format, pressing
► button.
- The vertical scale of the graph is automatically selected, depending on the column with the highest value.
Waveform page
- These pages graphically view the waveform of the measured voltages and currents.
- It
’ s possible to see one phase at the time, selecting it with ► button, or 3 phase system page.
- The vertical scale is automatically scaled in order to fit the waveforms on the screen.
- The graph is automatically updated every refresh time selected by the user (DISPLAY menu).
- Every page shows the total harmonic distortion (THD) and the instantaneous value for each these measurements.
Trend graph page
- The trend graph page allows to show the changes in the time of phase-to-neutral voltages and currents. This functionality provides a real-time snapshot of network
condition.
- It
’ s possible to see, on the graph, the history of last 60 values of the measurement, each correspondent to every 2 seconds of instantaneous value.
- When the maximum storing capacity is exceeded, the newest data will overwrites the oldest, so that the most recent data is always shown.
- The vertical full-scale is calculated automatically.
Power bar-graph page
- This page graphically view the daily power consumption (24 hours) of the active and reactive powers read by the EMA-D6.
- It
’ s possible to see one day at a time, selecting it by clicking ► button.
- The vertical full-scale is calculated automatically, depending on the column with the highest value.