RESOLUTION INTO SYMMETRICAL COMPONENTS

Functionality and distinctive features:

• Phasor and symmetrical component angle and length can be modified with a computer mouse or a keyboard using entry fields on the left;
• Radio buttons allow to set “the most popular” variants of phasor diagrams;
• The “popular” phasor diagrams are created based on the assumption that Z₁=Z₂=Z₀;
• The “Snap” button generates random phasor diagram variants;
• The value in the “Scale” field is equal to phasor length in a three-phase symmetrical mode;
• Positive angles are laid off counterclockwise from a vertical axis;
• A dot serves as decimal mark;
• The interactive model functions properly on a PC in Opera, Chrome, Firefox and Safari browsers.

Description:

Phasor diagrams demonstrate the way a three phasor unsymmetrical system can be resolved into three symmetrical ones (Fortescue theorem), namely, a positive-sequence, a negative-sequence and a zero-sequence system. This resolution finds its application in the analysis of three phase network unbalanced conditions (method of symmetrical components). The connection between phasors is expressed by the following formulas: