For Voltage Drop and power loss calculations.Can it be modelled as 'T' or 'Pie'?
The Total Inductance of the Line is measured as 0.04H and Capacitance as 0.4 microFarad.
It can be modeled with "Pi" scheme. If a single diagram is not enough, you can always model the longer transmission lines with multiple serially connected "Pi" models.
Transmission lines with length less than 80 km are classified as short transmission lines and 'pi' model is more than enough to represent such lines.
The capacitance of the line draws a current of around 6A which can't be neglected for the VD and Power Loss calculations of the line, but the textbooks say to consider the line as short, totally neglecting the effect of capacitance.
Dear Friend,
If the system frequency is 50/60Hz, the 42km long line is regarded as short trans. line. Only x component (without R) is used and voltage drop is calculated as dV=I.x (Volts)
Since the line being considered is short line there is no need to go in for any complex representation. It is enough to represent using pi or tee model. Methods of calculating the values of the parameters for modelling are eadily available and some experts have indicated in their answer.
Dear Friend,
If we talk about a transmission line with 42km and 50Hz, there is no need to use pi or T models. However, if you use, there will not be any mistake and the model will be perfect :)
When the frequency of supply is 50Hz and length of 42 kms only for a 220kV line as suggested by Oken Ozgonenel even lumped parameter can be used when we find that the effect of capacitance is negligible. However, normally pi or T representstion is used for short lines without goig for distributed parameter representstion.
If you want to do power loss calculation, include the resistance of the line (lumped, of course) also in the series element of the model.
for the very long transmission lines we use T model but for the normale lines length we use "Pi" model. (R,X and C)
for your question you must use "pi" model for this line to determine the voltage drop and power losses.
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