In this topic, you study the Difference between AC and DC Transmission.
The conventional AC transmission system as
The two AC circuits converted for DC transmission are shown below
| Point of Comparison | AC Transmission | DC Transmission |
| Economics | Costlier
Complicated High towers Insulator cost more Conductor size bigger |
Cheaper
Simpler Low light poles Lesser Conductor size lesser |
| Power loss | More | Lesser |
| Efficiency | Efficiency lesser | Efficiency more |
| Skin effect | Present | Absent |
| Di-electric loss | More | Lesser |
| Corona effect | Predominant | Less predominant |
| Cost of compensation | More | Do not require compensation |
| Terminal equipment | Not much | Due to converters, filters, cost increases. |
| Distances | Economical For long Distances | Costly for long distances |
| Control of power transmitted | Less controllability than In DC | Fast controllability due to converter control |
| Fault current control | Control requires time | Controlled fastly |
| Voltage control | In AC, it is complicated due to line charging and inductive voltage drop | Easy |
| Change of voltage level | Possible due to use of transformer | Not that easy |
| Reliability | Good | Quiet good |
