Harmonic Analysis Configuration

Harmonic Analysis is an optional feature and must be made available through Feature Selection before it can be used.

It can be made available through WSOS at:

Display > Configuration > Feature Selection > Power Quality.

Or on the operator interface for an ACR or AS.

Once available, Harmonic Analysis settings can be configured in WSOS on the Harmonic page.

Display → Power Quality → Harmonics

Harmonic Analysis can only be configured using WSOS. There is no facility to configure Harmonic Analysis via the Operator Interface.

When Harmonics has been made available, it can be configured on the WSOS Harmonics page which is shown in the figure below.

The harmonics configuration page in WSOS can be used to:

• Enable Harmonic Analysis by selecting Harmonic Analysis On.

  • When Harmonic Analysis is On, a Harmonic Data display appears to show the value of harmonics being measured in a bar chart format.

• Set the Harmonic Threshold Time for between 2 and 60 s.

  • This is the time that a harmonic must exceed its threshold for before an alarm is recorded in the Event Log.

  • The Harmonic Threshold Time is also used when the harmonic value returns to below its threshold before an alarm Off event is logged.

• Edit the thresholds for 2^nd to 16^th harmonics plus THD for Current and Voltage.

Harmonics Display

The Harmonics configuration page has been modified (A50-15.06) to include a grid to view/edit the threshold values.

The thresholds for the 2^nd to 16^th harmonics plus THD can be set in the table directly in the Edit mode.

Editing Harmonics Alarm Thresholds

Selecting the Edit button on the Harmonics configuration page will put Harmonics Analysis in Edit mode.

This mode can be identified by the Cancel and Reset buttons that appear.

In Edit mode, the threshold values for each of the harmonics between 2^nd and 16^th as well as THD for both current (red) and voltage (green) can be configured.

Individual alarm thresholds are set by clicking and dragging each of the 32 bars provided as required.

When all thresholds have been set correctly, selecting the Commit button will save the settings and exit the Edit mode.

In the Harmonics Thresholds display in the figure below, the alarm thresholds have been set as shown for both voltage and current:

Figure 304
Harmonics Alarm Thresholds settings and configuration

NOTE: Harmonics that are set to zero, that is not configured, will never cause an alarm.

Harmonics Display

The Harmonics configuration page has been modified to include a grid to view/edit the threshold values.

Figure 305
Harmonic display page

The thresholds for the 2^nd to 16^th harmonics plus THD can be set in the table directly in the Edit mode.