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Learn about power flow, sags, dips, phase rotation, harmonics, flicker and more

Download our FREE Power Quality Teaching Tool to learn about single-phase distortion, power triangles, vector-based phase shift during voltage sags, waveforms with phase-sequence vectors, and more

Rev 3.0.4

Single-phase distortion, power triangles, vector-based phase shift during voltage sags, waveforms with phase-sequence vectors, additional translations, and more. Includes English and the following languages:

  • Traducción español de Francisco Patxi PAZOS
  • Traduction française par Georges SIMARD
  • Deutsche Übersetzung von Stefan FASSBINDER
  • Traducere în româna de Mircea CHINDRIS
  • Tradução Português por Bianco SANTANA and Paulo F. RIBEIRO
  • Polski T³umaczenie Roman TARGOSZ
  • Traduzione italiana a cura di Antonio BRACALE e Daniela PROTO
  • Svensk översättning av Mats / Gustav HÄGER

Trouble with downloading or installing?

It may be your system’s security settings. Some networks do not permit you to download an executable file (.exe).

Tested on Windows 95, Windows 98, and Windows XP. (For hints on Windows 2000, see the PQToyREADME.txt.)

Making copies for students, colleagues

FREE copying. There are absolutely no restrictions on copying and distributing this program. Please feel free to make as many copies as you like, give copies away, post a copy of the installation program on your web site, etc.

Sags and Dips

  • Play with voltage sags, and see in real-time how your sag affects single-phase and three-phase supplies
  • Knobs for adjusting power supply parameters, load, source impedance
  • Real-time display of volts, amps, unregulated voltage, regulated DC
  • NEW – grab the ends of vectors during voltage sags, and slide them around

Harmonics Primer

  • An intuitive harmonics simulator
  • Just adjust the amplitude and phase angle knobs for each harmonic, and immediately see the effect on the waveform
  • The sliding cursor makes it very clear what we mean when we say “add up the sine waves”

Harmonics Power Flow

  • A crystal clear graphic explanation of why harmonic currents increase volt-amps, without increasing power transfer

Harmonic Sequences

  • Intuitive, graphical explanation of harmonic sequencing for balanced three-phase systems

Fundamental Power Flow

  • On-screen knobs for dialing in current, voltage, and phase angle
  • Interact in real time with instantaneous volts, amps, power, power triangle with VA, W, VAR, PF, and more. Drag the waveform cursor left and right to demonstrate that the power waveform is simply the instantaneous voltage waveform multiplied by the instantaneous current waveform
  • Try dragging around the vertex of the power triangle to see what happens

Symmetrical Components

  • An animated, interactive way to understand unbalanced three-phase systems, and how positive-sequence and negative-sequence vectors work
  • Knobs for adjusting amplitude and angle of +, -, and 0 sequence vectors
  • Real-time effects of vectors, and vector sums
  • Corresponding sine waves shown as well


  • Knobs let you adjust resistive and inductive impedance
  • See how distorted currents affect the voltage waveform
  • Includes resonance, with knobs to adjust resonant frequency and Q


  • Knobs let you control the frequency and amplitude of flicker on your PC display screen
  • Check out the difference between looking at the screen directly, and watching it with you peripheral vision
  • Are you more sensitive to a particular flicker frequency?

Power Standards Lab
980 Atlantic Ave.
Alameda, California 94501
TEL: ++1.510.522.4400
US: 1.888.SEMI.F47 or 1.888.736.4347

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