Difference between AC and DC Transmission Line - Electrical C & V

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30 April 2020

Difference between AC and DC Transmission Line

Differences Between AC Transmission Line and DC Transmission Line
Differences Between AC and DC Transmission Line
Transmission Line

1. The AC transmission line transmits the alternating current over a long distance. Whereas, the DC transmission line is used for transmitting the DC over the long distance.

2. The AC transmission line uses three conductors for long power transmission. And the DC transmission line uses two conductors for power transmission.

3. The AC transmission line has inductance and surges whereas the DC transmission line is free from inductance and surges. The inductance and the surges are nothing but the wave of the high voltage which occurs for a short duration.

4. The high voltage drop occurs across the AC terminal lines when their end terminals voltage are equal. The DC transmission line is free from inductance, and hence no voltage drop occurs across the line.

5. The phenomenon of the skin effect occurs only in the AC transmission line. The skin effect causes the losses, and this can be reduced by decreasing the cross-section area of the conductor. The phenomenon of skin effect is completely absent in the DC transmission line.

6. At the same voltage, the DC transmission line has less stress as compared to the AC transmission line. Hence, DC requires less insulation as compared to AC.


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7. The communication line interference is more in the AC transmission line as compared to the DC transmission line.

8. The corona effect is the phenomenon through which the ionization occurs across the conductor. And this ionization causes the losses in the conductor. The phenomenon of the corona effect occurs only in the ac transmission line and not in the dc transmission line.

9. The dielectric loss occurs in the ac transmission line and not in the DC transmission line.

10. The AC transmission line has the difficulties of synchronization and stability whereas the DC transmission line is free from stability and synchronization.

11. The AC transmission line is less expensive as compared to the DC transmission line.

12. The small conductor is used for AC power transmission as compared to the DC transmission.

13. The AC transmission line requires the transformer to step-up and step-down the voltage. Whereas in the DC transmission line the booster and chopper are used for step-up and step-down the voltage.

14. The AC transmissions line is used for small power transmission. And for large distance power transmission, the DC transmission system is used.





More Details:- Types of conductors used in Transmission line





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