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Transmission Line in Power System

What is Transmission Line?

Transmission line is the long conductor with special design (bundled) to carry bulk amount of generated power at very high voltage from one station to another as per variation of the voltage level.electrical transmission line

Type of Transmission Line

In transmission line determination of voltage drop, transmission efficiency, line loss etc. are important things to design. These values are affected by line parameter R, L and C of the transmission line. Length wise transmission lines are three types.

Short Transmission Line

Medium Transmission Line

Long Transmission Line

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Transmission Line in Power System

What is the Transmission Efficiency?

Transmission efficiency is defined as the ration of receiving end power PR to the sending end power PS and it is expressed in percentage value. cosθs is the sending end power factor. cosθR is the receiving end power factor. Vs is the sending end voltage per phase. VR is the receiving end voltage per phase.

What is Transmission Line Voltage Regulation

Voltage regulation of transmission line is defined as the ratio of difference between sending and receiving end voltage to receiving end voltage of a transmission line between conditions of no load and full load. It is also expressed in percentage. Where, Vs is the sending end voltage per phase and VR is the receiving end voltage per phase. XL is the reactance per phase. R is the resistance per phase. cosθR is the receiving end power factor. Effect of load power factor on regulation of transmission line:
  1. For lagging load
  2. For leading load
Now

Effect of Load Power Factor on Efficiency of Transmission Line

We know efficiency of transmission line is Now, for short transmission line, IR = IS = I So, considering three phase short transmission line, So, Now it is clear that to transmit given amount of power, the load current is inversely proportional to receiving end power factor. Again in case of medium and long transmission line, Here it is clear that transmission efficiency depends on the receiving end power factor.

What is End Condenser Method in Medium Transmission Line?

In this method capacitance is assumed to be lumped at receiving end. One phase is shown below. medium transmission line Here IR is the receiving end load current per phase, R is the resistance per phase, XL is the inductive reactance per phase, C is the capacitance per phase, cosΦR is the receiving end lagging power factor, VS is the sending end voltage. Let us assume, as the reference phasor, Load current at receiving end The capacitive current Now, Now, and

What is Nominal T Method in Medium Transmission Line?

Total capacitance of the line is assumed to be concentrated at the middle point of the line, and at both side half of line resistance and inductance is lumped. t method in medium transmission line Here, IR is the receiving end load current per phase, R is the resistance per phase, XL is the inductive reactance per phase, C is the capacitance per phase, cosΦR is the receiving end lagging power factor, VS is the sending end voltage. V1 is the voltage across the capacitor. Voltage across Capacitor C, Capacitive current Sending end current Sending end voltage

What is Nominal π Method in Medium Transmission Line?

In this method total line capacitance is assumed to be lumped and divided into two halves to be connected across sending end and receiving end respectively. Total line resistance and inductance are assumed to be present in middle of the line. pi method in medium transmission line Here IR is the receiving end load current per phase, R is the resistance per phase, XL is the inductive reactance per phase, C is the capacitance per phase, cosΦR is the receiving end lagging power factor, VS is the sending end voltage. Let us assume, as the reference phasor, Load current at receiving end The capacitive current at load end Line current Sending end voltage, Charging current at the sending end is Sending End current is

What is Nominal T Method in Medium Transmission Line?

In this method the whole line capacitance is assumed to be concentrated at the middle point of the line and half the line resistance and reactance are lumped on its either side. Therefore in this arrangement full charging current flows over half the line.


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