# Performance of Transmission Line & Travelling Wave Analysis For Electrical Engineering

By BYJU'S Exam Prep

Updated on: September 25th, 2023

In this article, you will find the study notes on Performance of Transmission Line & Travelling Wave Analysis, which will cover the topics such as Transmission Line, Short Transmission Line, Regulation & Efficiency of Short Transmission Line, Medium Transmission Line, regulation & Efficiency of Medium Transmission Line, Long Transmission Line, Regulation & Efficiency Of Medium transmission Line, Surge Impedance Loading, Termination of Transmission; Line with Open-Ended, Short Circuited Line, Termination of Line With Resistance, Line Terminated by an Inductor, Line terminated by a Capacitor, Parallel reactive Termination, Transmission Coefficient at T Junction & Line connected to a Cable.

Table of content

where, β = Phase shift in red/mile

Key Points

• Surge impedance for the transmission line is 400Ω and for cable, it is 40 Ω.
• The phase angle of surge impedance (ZC) of transmission lines is in range of 0o to -15o.
• If loading of the = SIL, then the power factor will be unity. Hence, maximum power can be transferred and the line can be called as the flat line.
• If loading of line > SIL, then power factor will be lagging.

Wave Phenomenon

Refracted (transmitted) wave = Incident (forward) wave + Reflected wave

VT = VF + VR

where, VT = Refracted (transmitted) voltage wave

VF = Incident or forward voltage wave

VR = Reflected voltage

Transmission Line Termination

Case (1) Open-Ended Line

• Current becomes at load end zero. Due to this electromagnetic energ

## Transmission Line

A transmission line is a set of conductors being run from one place to another supported on transmission towers. Therefore, such lines have four distributed parameters, series resistance, inductance shunt capacitance and conductance.

Transmission lines are typically made of conductive materials, such as copper or aluminum, that have low resistance to allow for efficient power transmission. They are used in both overhead and underground applications, depending on the specific requirements and environmental factors.

Short Transmission Line

The effect of capacitance is ignored in these lines, length of short transmission line is less than 80 km.

where, Vs = Sending end voltage

ls = Sending end current

VR = Receiving end voltage

IR = Receiving end current

IS = IR

VR +l(R+ jX) = Vs

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