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1capybara
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Non Standard Notation?

09/14/2013 12:54 AM

this is from http://www.eng-tips.com/faqs.cfm?fid=314 quote:

System generators do not generate negative sequence currents, but negative sequence can flow in their windings. For rotating machines X2 = 1/2(X"d + X"q). Except for calculating faults very near machine terminals, can assume X"d=X"q, so X2 = X"d.

does X2 mean X sub 2? does X" mean X^2 ? what are the definitions of q and d?

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lyn
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Re: non standard notation ???

09/14/2013 11:07 AM

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RAMConsult
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Re: Non Standard Notation?

09/14/2013 10:21 PM

This is a bunch of those Electric Power Engineers' trivia questions that if you have ask it means that you have not taken a basic electric machines course:

does X2 mean X sub 2? Yes, the sub 2 denotes Negative Sequence

does X" mean X^2 ? No, it means Subtransient reactance.

what are the definitions of q and d? direct and quadrature.

For more info Google on each of your questions. Class dismissed.

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