1）可以长距离、大容量输送电力
R88M-WP75030T内地76%的煤炭资源在北部和西北部，80%的水能资源在西南部，而70%以上的能源需求在中东部，普通电网的传输距离只有500公里左右，无法满足传输要求。1000千伏交流特高压的输电功率是500千伏交流的4～5倍，经济输电距离是500千伏交流的3倍。
2）降低输送损耗
R88M-WP75030T在导线总截面、输送容量均相同的情况下，±800千伏直流线路的电阻损耗是±500千伏直流线路的39%，是±600千伏级直流线路的60%，提高输电效率，节省运行费用。
3）节省工程投资
800千伏直流输电方案的单位输送容量投资约为±500千伏直流输电方案的72%。溪洛渡、向家坝、乌东德、白鹤滩水电站送出工程采用±800千伏级直流与采用±620千伏级直流相比，输电线路可以从10回减少到6回，并节约综合投资约150亿元。
4）走廊利用率高
±800千伏、640万千瓦直流输电方案的线路走廊为76米，单位走廊宽度输送容量为8.4万千瓦/米，是±500千伏、300万千瓦方案和±620千伏、380万千瓦方案的1.3倍左右，提高输电走廊利用效率，节省宝贵的土地资源；由于单回线路输送容量大，显著节省山谷、江河跨越点的有限资源。
5）统筹利用环境容量，优化煤电布局特高压优势
1）可以长距离、大容量输送电力
R88M-WP75030T内地76%的煤炭资源在北部和西北部，80%的水能资源在西南部，而70%以上的能源需求在中东部，普通电网的传输距离只有500公里左右，无法满足传输要求。1000千伏交流特高压的输电功率是500千伏交流的4～5倍，经济输电距离是500千伏交流的3倍。
2）降低输送损耗
在导线总截面、输送容量均相同的情况下，±800千伏直流线路的电阻损耗是±500千伏直流线路的39%，是±600千伏级直流线路的60%，提高输电效率，节省运行费用。
3）节省工程投资
800千伏直流输电方案的单位输送容量投资约为±500千伏直流输电方案的72%。溪洛渡、向家坝、乌东德、白鹤滩水电站送出工程采用±800千伏级直流与采用±620千伏级直流相比，输电线路可以从10回减少到6回，并节约综合投资约150亿元。
4）走廊利用率高
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