Suppose there is a transmission line of 20m. I have following data surge impedance is 350 ohms and travel time is 300 m/µsec.
By using the formulae:
Z0 = 60 ln b/a; -> (1)
C = 2*pi*ᵋ/ ( ln b/a ); ->(2)
L = (µ ln b/a)/(2*pi); ->(3)
From eq. 1,2,3 I get L = 1.16µH, C = 9.53 pF.
Or do i require to follow any other procedure to simulate in EMTP-RV.
What parameters are required to model a transmission line in EMTP-RV? Is this described/prescribed by the software?
Sir,
Data in hand surge impedance and travel time of line.
parameters which i require to model line in emtp-rv inductance, capacitance.
so I used above formula to get L, C. Can i use the above procedure.
Regards,
Jayadhar.
Dear Jayadhar, I will suggest after you get the values of L & C, you can use the standard PSPICE transmission line model with a properly representative waveform. This will be easy to simulate. I hope I got your question in right perspective?
If we take epsilon = epsilon0 , considering the line speed (is speed of light in vacuum), I get the same numerical results as you. It looks ok to me, if it is assumed a coax line is applied. Does EMPT-RV assume the power line is coax?
If you can calculate these data: the zero and positive sequence of the series resistance, the series inductive reactance and the parallel capacitive reactance you can model a single-phase constant parameter transmission line model. To model a polyphase transmission line model you need a transformation matrix for doing the computations in the model domain and for doing the conversion of data between the modal and phase domains.
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