Phasor Diagrams from Real Fault Recordings
Upload a COMTRADE file and see live voltage and current phasors at any point in the recording. Place dual cursors to compare pre-fault and fault conditions side by side.
Everything you need to read a phasor diagram
Interactive Polar Plot
See voltage and current phasors rendered on a live polar diagram. Scrub through the recording and watch magnitudes and angles update in real time.
A/B Cursor Comparison
Place dual cursors at any two time points — pre-fault and fault, or trip and reclose — and view side-by-side phasor diagrams to spot exactly what changed.
Sequence Components
Create positive-, negative-, and zero-sequence signals in the Compute tab. Sequence phasors appear alongside phase quantities so you can assess unbalance and fault type at a glance.
Magnitude & Angle Display
Every phasor shows its RMS magnitude and phase angle in a compact readout table. Delta values between A and B cursors are highlighted automatically.
IEC & ANSI Color Schemes
Switch between IEC (red/yellow/blue) and ANSI (red/amber/green) color conventions in one click. Your preference is saved across sessions.
Connected Analysis
Phasors are linked to every other viewer tab. Jump from the phasor diagram to impedance, directional, or fault-location analysis without losing your cursor positions.
Who uses phasor diagrams?
From post-fault investigations to classroom teaching, phasor diagrams from real recordings reveal what actually happened on the network.
- •Fault investigation — confirm fault type (SLG, LL, 3PH), measure voltage depression and current magnitude, and verify relay operated on the correct phasor relationship.
- •Relay validation — compare measured phasors against relay event reports to confirm settings are correct and polarisation is as designed.
- •System state assessment — use sequence components to quantify unbalance before and after a switching event or during abnormal loading conditions.
- •Teaching and training — load a real disturbance recording and walk through phasor theory with actual field data. See the phasor computation theory or the phasors guide for background.
Frequently asked questions
See your phasors in seconds
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