Electrical Power Transmission Line and It's Main Parameters

What is Electrical Power Transmission Lines? 

Electrical power transmission line is used to transmite of electrical power from source point like generating substation or grid substation to the load point like main distribution substation or various distribution units. 

Electrical Power Transmission Line transmits the wave of voltage and current from one end to another. Electrical energy transmission line is made up of a Copper or Alluminium conductor having a uniform cross-section along the line. 

In overhead power transmission lines, air between the conductors act as an insulating or dielectric medium. In case of underground power transmission line conductors are very closed to each others and is seperated by some insulation materials like- insumating paper, XLPE (crossed link polyethylene), etc.

Phase gap or safety clearance between exposed overhead live line and ground, the distance between the line and ground is much more. The electrical tower is used for supporting the conductors of the transmission line to keep in safe height from the ground.

The main factor of any electrical power transmission line is transmission tower. The Main parameters of high voltage transmission lines are mainly depend on voltage level.  There are different types of towers use for electrical power transmission lines. The major types of Transmission towers can categorize as bellow.

  1. Suspension Tower
  2. Tension Tower
  3. Transposition Tower [0-10 degree tension towers (TD1)10- 30 degree tension towers (TD3)30-60 degree tension towers (TD6)]
  4. Special Tower

Tower are made up of steel for providing high strength to the conductor. For transmitting high voltage, over long distance high voltage direct current is used in the transmission line.

Parameters of Electric Transmission Line

Electrical power transmission line mainly contain four parameters as below:
  1. resistance; 
  2. inductance;
  3. capacitance, & amp;
  4. shunt conductance.
The performance of transmission line depends on the parameters of the line. The transmission line has mainly four parameters, resistance, inductance, capacitance and shunt conductance. These parameters are uniformly distributed along the line. Hence, it is also called the distributed parameter of  the transmission line.

Resistance of Electric Transmission Line

AC resistance of a conductor in a electric transmission line cannot be calculated due to frequency and phase changing continuously. Based on the calculation of DC resistance of transmission line conductor, AC resistance is calculated.

If DC current is flowing along a round cylindrical conductor, the current is uniformly distributed over its cross-section area and its DC resistance is evaluated by

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