DIFFERENCE BETWEEN AC & DC TRANSMISSION - ELECTRICAL ENCYCLOPEDIA

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DIFFERENCE BETWEEN AC & DC TRANSMISSION

Hello friends, welcome to ELECTRICAL ENCYCLOPEDIA. In this article, we will compare AC transmission with DC transmission.


DC TRANSMISSION

ADVANTAGES OF DC TRANSMISSION

1. DC transmission requires only 2 conductors as compared to AC transmission which uses 3 conductors.

2. There is no inductance, capacitance, phase displacement and surge problems in DC transmission.

3. Due to absence of inductance, voltage drop in DC transmission is less than the AC transmission for same load. Therefore, DC transmission has better voltage regulation.

4. There is no skin effect (what is skin effect?) in a DC transmission. Therefore, complete cross section of conductor is utilized.

5. A DC line has less corona loss (what is corona?)and less interference with communication system.

6. A DC line requires less insulation for same working voltage,because potential stress on the insulation is less in case of DC System.


DISADVANTAGES OF DC TRANSMISSION

1. Electric Power cannot be generated at Higher Voltages due to commutation problems.

2. DC Voltage cannot be stepped up or stepped down.

3. DC Switches & Circuit Breakers have their own limitations.

AC TRANSMISSION

ADVANTAGES OF AC TRANSMISSION

1. AC power can be easily generated at high voltages.

2. AC Voltage can be easily Stepped up or Stepped Down by using transformers (what is transformer?).

3. Maintenance of AC Substations is easy and Cheaper.

DISADVANTAGES OF AC TRANSMISSION


1. AC line requires more copper than DC line.

2. Construction of A.C transmission line is more complicated than DC line.

3. Because of Skin Effect (what is skin effect?), the effective resistance of the line is increased.

4. AC transmission line requires atleast 3 conductors.

CONCLUSION

Hence from the above discussion it is clear that generating high DC voltage is hectic so generation of Electric power should be in AC and transmitting Electric power in DC will be more beneficial. But till now transmission is mostly carried out as AC. Efforts are made to make devices which can make it possible to convert high voltage AC to DC and vice versa. Mercury Arc Rectifiers and thyratrons have made it possible to convert ac into dc and versa efficiently.

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