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-ve and +ve sequence measurements
- Thread starter salem
- Start date
The positive and negative sequence impedance, Z+ & Z- for a transmission line should be equals since lines are passive electrical components.
For short transmission line (length <80 kM ~ 50 mi) the Z+ = Z- is equivalent to the voltage measured at the receiving-end (load side) when excited at the sending-end side with a balanced 3-phase voltage source with current of 1 Amp circulating at the receieving-end short-circuited lines.
OBSERVATION:
i- For short transmission line, the two-port network parameter B = Z = R + j.X
ii-For short circuit at the receiving end (Vr =0).
iii-From the generalized equation
Vs = A.V[blue]r[/blue]+ B.I[blue]r[/blue]= Z.Ir
Therefore, for I[blue]r[/blue]=1Amp, |Z |= Vs[blue]sc[/blue] with an angle= (I<V)
For short transmission line (length <80 kM ~ 50 mi) the Z+ = Z- is equivalent to the voltage measured at the receiving-end (load side) when excited at the sending-end side with a balanced 3-phase voltage source with current of 1 Amp circulating at the receieving-end short-circuited lines.
OBSERVATION:
i- For short transmission line, the two-port network parameter B = Z = R + j.X
ii-For short circuit at the receiving end (Vr =0).
iii-From the generalized equation
Vs = A.V[blue]r[/blue]+ B.I[blue]r[/blue]= Z.Ir
Therefore, for I[blue]r[/blue]=1Amp, |Z |= Vs[blue]sc[/blue] with an angle= (I<V)
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