Phasor and Temporal Diagrams in Electrical Power-System Fault Analysis

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).


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[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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