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Forums
Engineering
Electrical Engineering
Negative and zero sequence impedance of alternator
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[QUOTE="cnh1995, post: 5697890, member: 552336"] Actually, we measure the line voltage V[SUB]RB[/SUB] and divide it by √3*I to get the negative sequence impedance. After playing with some equations for some time, I managed to prove how this procedure gives the negative sequence impedance. Not a single book or lab manual I referred so far gives any explanation about this method. But it turns out that this is a clever method designed from the equations for LL fault. You are shorting the white (you sure it's white and not yellow?) and blue phases. Find an expression for negative sequence component of voltage V2 in terms of line voltages. It comes out to be, V[SUB]2[/SUB]=(V[SUB]R[/SUB]-V[SUB]B[/SUB])/3. Now find an expression for fault current (i.e. -I[SUB]B[/SUB] or I[SUB]W[/SUB]) in terms of negative sequence current I[SUB]2[/SUB]. This gives I[SUB]2[/SUB]=I[SUB]W[/SUB]/√3. ∴Z[SUB]2[/SUB]=V[SUB]2[/SUB]/I[SUB]2[/SUB] =(V[SUB]RB[/SUB])/(√3I[SUB]W[/SUB]) ..which is what we get from the given arrangement. [/QUOTE]
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Engineering
Electrical Engineering
Negative and zero sequence impedance of alternator
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