The following are the main comparison between High voltage A.C. & High voltage D.C. system.
| Sr. No. | HVDC | HVAC |
|---|---|---|
| 1. | Only or two conductor are used. | Three conductor are required. |
| 2. | Saving of conductor material as only 2 or 1 conductor is used. | Less saving of conductor as 3 conductors are used. |
| 3. | There is no problem of L, C, surge & phase displacement. | There is losses due to L, C, surge & phase displacement. |
| 4. | No problem of skin effect so full cross-sectional area of conductor is used. | Due to skin effect cross-sectional area of conductor is not utilized. |
| 5. | It has less potential stress. So less insulation is required. | It has more potential stress than D.C. system. So more insulation required. |
| 6. | Corona losses are very low. | High corona losses in A.C. system. |
| 7. | No interference with communication system. | There is interference with communication in A.C. system. |
| 8. | There is no problem of synchronizing & stability. | They have problem of synchronizing & stability in A.C. system. |
| 9. | For high voltage transmission, we cannot step the level of D.C. voltage. | The level of A.C. voltage can be increased or decreased by using transformer. |
| 10. | Costly circuit breakers & switches used in DC system. | AC circuit breakers are cheaper than DC circuit breakers. |
| 11. | The HVDC transmission is used for transmitting bulk power more than 600 KM distance. | HVAC transmission is used for less than 600 KM distance. |
| 12. | Transmits DC power at a voltage about 100 KV to 800 KV. | Transmits AC power at a voltage about 33 KV to 230 KV. |
| 13. | Inverters and rectifiers are used in HVDC. | Inverters and rectifiers are not required for HVAC. |
| 14. | HVDC requires small sized tower. | HVAC requires large sized tower. |
| 15. | Very fast and accurate power flow control is possible. | Power flow control is slow and is very difficult. |
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