Appendix B
Technical Data of UHV AC Transmission Lines
Table B.1
Technical Data of UHV AC Transmission Lines.
| Project | UHV AC Single-Circuit Line (UHV AC Pilot and Demonstration Project) | UHV AC Double-Circuit Line (Anhui–Shanghai Project) | |
| Nominal voltage (kV) | 1000 | 1000 | |
| Maximum operating voltage (kV) | 1100 | 1100 | |
| Total length (km) | 639.8 | 2×656 (including large crossing over the Huai River 2.42 and large crossing over the Yangtze River 3.18) | |
| Minimum air gap | |||
| Required air gap under power frequency voltage (m) | 2.7 for altitudes up to 500 m | 2.7 for altitudes up to 500 m | |
| 2.9 for altitudes up to 1000 m | |||
| 3.1 for altitudes up to 1500 m | |||
| Required air gap under switching overvoltage (m) | 6.7/7.9a for middle-phase V-string and 5.6b for outside-phase I-string for altitudes up to 500 m ... | ||
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