Advantages of dc transmission over ac transmission
advantages of dc over ac supply
comparison between ac and dc transmission pdf advantages and disadvantages of ac transmission system pdf advantages and disadvantages of ac and dc power supply
Advantages of dc transmission :
 |
| Lattice (left) and Monopole (right) Towers |
Different types of dc link in direct current transmission
1) Greater power per conductor. Simpler line construction.
2) Ground return can be used. Hence each conductor can be operated as an independent circuit.
3)No charging current.
4)No skin effect.
5)Cables can be worked at a higher voltage gradient.
6)Line power factor is always unity; line does not require reactive compensation
7) Less corona loss and radio interference, especially in foul weather, for a certain conductor diameter and rms voltage.
8) Synchronous operation is not required. Hence distance is not limited by stability.
9)May interconnect ac systems of different frequencies.
10)Low short-circuit current on dc line.
Disadvantages of dc transmission:
1) Converters are expensive.
2) Converters require much reactive power.
3) Converters generate harmonics, requires filters.
4) Converters have a little overload capability.
4) Converters have a little overload capability.
5) Lack of dc circuit breakers
Post a Comment