Phasor and Temporal Diagrams in Electrical Power-System Fault Analysis

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This Demonstration uses phasor and temporal diagrams to show the effect of symmetric and asymmetric faults in a three-phase system.


A temporal diagram shows the signals in cosine form, in which it is difficult to analyze the effect of a fault in an electrical system. In such cases, the phasor diagram helps the analysis. A phasor diagram represents the cosine wave frequencies as a vector.

The symmetric decomposition of phases A, B, and C shows the effects caused in symmetrically equivalent circuits (in positive, negative, and zero sequences).


Contributed by: Daniel Motter (September 2011)
Based on a program by: Daniel Motter
Open content licensed under CC BY-NC-SA




[1] W. D. Stevenson, Jr., Elements of Power System Analysis, 3rd ed., New York: McGraw–Hill, New York, 1975.

[2] B. Mirafzal, "Power Systems (III)." (Sep 2011)

[3] J. R. Lucas, "EE 423—Power Systems Analysis." (Sep 2011)

[4] "Protection Basics: Introduction to Symmetrical Components." (Sep 2011)

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