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cnh1995

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cnh1995

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anorlunda

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In electrical engineering, the method ofsymmetrical componentsis used to simplify analysis of unbalanced three-phase power systems under both normal and abnormal conditions. The basic idea is that an asymmetrical set ofNphasors can be expressed as a linear combination ofNsymmetrical sets of phasors by means of a complexlinear transformation.[1] In the most common case of three-phase system, the resulting "symmetrical" components are referred to asdirect(orpositive),inverse(ornegative) andzero(orhomopolar). The analysis of power system is much simpler in the domain of symmetrical components, because the resulting equations are mutually linearly independent if the circuit itself is balanced.

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cnh1995

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anorlunda

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I suggest that you study symmetrical components enough to solve the homework problem of making an equivalent circuit for a L-L fault. Once you have that, it should be obvious which impedance you are measuring.

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You should be able to plug and chug, but I'm not able to use a program to give me a quick and dirty answer, and I don't have time to do the calculation by hand.

See if this can shed any light onto your problem...

https://cdn.selinc.com//assets/Lite...etrical-Pt1_AR_20130422.pdf?v=20150812-081134

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