Phasors

What This Tab Does

The Phasor tab displays voltage and current vectors on a polar diagram at the current cursor time. Each vector shows the magnitude and angle of a single channel, extracted from the waveform using a one-cycle DFT. Move the cursor along the waveform or use the playback slider to see how the phasors change through a fault or switching event.

Phasors reduce a continuously oscillating waveform to a single magnitude and angle, making it easy to see phase relationships at a glance. A balanced three-phase system shows three voltage vectors separated by 120 degrees; during a fault, the affected phases collapse or shift, revealing the fault type and severity.

Time Playback

The playback slider at the top of the tab lets you animate the phasor diagram through time without leaving the tab. Press Play to watch the phasors rotate and change magnitude as the recording progresses — this is especially useful for observing how phasors respond at the instant of fault inception, during fault evolution, and at clearance.

You can also drag the slider thumb to scrub to any point manually. The phasor diagram updates in real time as you move.

When dual cursors (A/B) are placed on the waveform, their positions appear as draggable markers on the slider — blue for Cursor A and orange for Cursor B. You can drag these markers directly on the slider to reposition the cursors without switching back to the waveform tab.

A/B Compare Mode

Use A/B Compare Mode to display two phasor diagrams side by side at different cursor times. This is useful for comparing pre-fault and fault conditions, or for comparing the start and end of a transient event. Place Cursor A before the fault and Cursor B during the fault to see exactly how the voltage and current phasors changed. The A and B cursor positions are visible on the playback slider, so you can fine-tune their placement directly from the Phasors tab.