In a multi machine interconnected system, subsequently to a 3-phase fault, the
transient stability is examined by
Equal-area criterion
Solution of swing equation
Either by equal-area criterion or by
solution of swing equation
Combination of equal-area criterion and solution of swing equation
Solution of swing equation
Transient stability analysis
of a multi machine system uses classical approach i.e. node elimination by
matrix algebra that uses swing equation before fault and past fault.
Hence, the correct option is
(B).
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