Discussion
Theory of symmetry among symmetrical components is given by :
Answer: B
The theory is Fortescue's theory.
C.L. Fortescue showed in 1918 that any set of unbalanced three-phase phasors can be resolved into three balanced sets: positive sequence, negative sequence and zero sequence. These symmetrical components are the standard tool for analysing unsymmetrical faults.
Slepian's theory and Cassie's theory are theories of arc interruption in circuit breakers: Slepian's is the race between dielectric strength and restriking voltage, and Cassie's is a model of the arc's conductance. Faraday's work is on electromagnetic induction. None of them deals with symmetrical components.
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