Classification of transmission lines

Presentation on transmission line and their classification including, underground cables. overhead line plus long, medium and short transmission lines

1. Classification Of Transmission Lines Present by Mahfooz Alam 2164-2018 Syed Hamza Abbas 2354-2018

2. Classification Of Transmission Lines

3. Transmission Line A transmission line is used for electrical power from generating substation to the various distribution units. It transmits the wave of voltage and current from one place to another. The transmission line is made up of a conductor having a uniform cross section along the line, air acts as an insulating or di electric medium between the conductors.

4. Classification of the Transmission line 1.Overhead transmission lines, Short transmission lines, Medium transition lines, Long transmission lines. 2. Under ground cables .

5. OverHead Power Line An overhead power line is a structure used in electric power transmission and distribution to transmit electrical energy along large distances. It consists of one or more conductors suspended by towers or poles. Since most of the insulation is provided by the air , overhead lines low cost method to provide large amount of electric energy.

6. Short Transmission Lines Line voltage is less then 20 KV. Length of transmission line is up to about 80 Km. Capacitance effect are small or negligible.

7. Medium transmission Lines Line Voltage is greater than 20KV but less than 100KV. Length of lines is about 50Km to 150Km . Capacitance is significant.

8. Long Transmission Lines Line voltage is very high , greater than 100KV . Length of the overhead line is more than 150Km .

9. A dvantages Cheaper to install and maintain as compared to underground cables Quicker to fix whenever faults develops. They have large transmission capacity .

10. Disadvantages Affected by environmental conditions such as Temperature, Wind, Rain , Etc. Also affected by Thunder and Lightening. Not Very safe in densely populated Area.

11. Underground Transmission Lines Underground cables is the replacement of overhead cables providing electrical power. They are protected from high wind thunderstorms or heavy snow or ice storms. Underground cables can increase the initial costs of electric power transmission and distribution but may decrease operational cost over the lifetime of the cables.

12. Advantages; Low chances of developing faults. Low maintenance cost. Not influenced by environmental conditions. More durable than overhead lines. More safer than overhead lines .

13. D isadvantages ; Very expensive. It cost four times the overhead lines. Repairing of the underground cables is not easy. Maintenance cost is also very high.