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Which of the following are the basic parameters of the transmission lines?
Resistance / Conductance
Inductance
Capacitance
All of these
All of these
Transmission lines are characterized by four primary electrical parameters: resistance (R), inductance (L), capacitance (C), and conductance (G). These are distributed uniformly along the length of the line, collectively determining the propagation characteristics of electromagnetic waves.
Transmission lines are characterized by four primary electrical parameters: resistance (R), inductance (L), capacitance (C), and conductance (G). These are distributed uniformly along the length of the line, collectively determining the propagation characteristics of electromagnetic waves.
Z0тАЛ=G+j╧ЙCR+j╧ЙLтАЛтАЛ тАФ Characteristic Impedance
╬│=(R+j╧ЙL)(G+j╧ЙC)тАЛ тАФ Propagation Constant
Resistance arises from the finite conductivity of the conductor material and temperature effects. Inductance results from the magnetic field flux linkages surrounding the current-carrying conductors. Capacitance occurs due to the potential difference between conductors separated by air as a dielectric, while shunt conductance represents leakage current through insulators or ionization of the surrounding air.
Resistance and Inductance are series parameters.
Capacitance and Conductance are shunt parameters.
For power lines, R and L are often dominant, while G is frequently negligible.
These parameters are defined 'per unit length' (e.g., ╬й/km, F/km).
Enables accurate modeling of voltage drop and power loss.
Allows for precise determination of Surge Impedance Loading (SIL).
Increases mathematical complexity in analysis of long lines.
Conductance can increase significantly under humid or polluted weather conditions.
Power system load flow analysis.
Stability studies and protection relay coordination.
Communication signal propagation modeling.
A transmission line is considered 'short' if its length is < 80 km, 'medium' if 80-250 km, and 'long' if > 250 km.
Option A is technically a mix of series and shunt parameters, but all choices listed are indeed basic parameters.
D is correct тАФ All four elements (Resistance, Inductance, Capacitance, and Conductance) constitute the primary distributed parameters of a transmission line.
In competitive exams, remember that for short transmission lines, the shunt capacitance and conductance are often ignored to simplify calculation to a lumped RL circuit.