Compare AC & DC transmission system
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| Particular | AC Transmission system | DC Transmission system |
| Definition | The AC transmission line transmit the alternating current. | The DC transmission line transmit the Direct current. |
| No of conductors used | Three | Two |
| Inductance & Surges | Have | Don’t have |
| Voltage drop | More | Low |
| Skin effect | Occurs | Absent |
| Ned of insulation | More | Less |
| Corona less | Occurs | not occur |
| Dielectric loss | Have | Don’t have |
| Cost | Expensive | Cheap |
| Transformers | Requires | Not requires |
| Repairing & Maintenance | Easy | Difficulty |
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