Shanghai Daoqin Plastics Co., Ltd.

特 high pressure 直流输 electrical electrical pressure and other grade concept and 交流输 electrical 不一样. for/regarding 交流输 electrical 说, generally will 220kV and below/following electrical pressure and other grade is high pressure, 330～750kV is ultra-high pressure,1000kV and above is high pressure. 直流输 electrical has different, ±100kV above is high pressure; ±500kV and ±600kV still is high pressure, generally is ultra-high pressure; ultra- ±600kV is high pressure. for/regarding mono 项直流输 electrical engineering 而言, usually according to its electrical amount, electrical and other factors technology, 经济方面 comprehensive comparison, for engineering property design 而确定 versus 应 直流 electrical pressure and other grade. for high pressure 直流输 electrical electrical pressure and other grade research and 论证时, to for 直流输 electrical technology R&D water and equipment made can force, is 确定一 特 high pressure electrical pressure water is necessary, 并 ±800kV确定 is 我国特 high pressure 直流输 electrical electrical pressure. this has 利于我国特 high pressure 直流输 electrical technology and equipment manufacturing standards 化, specification 化, series development, has 利于进行我国特 high pressure 直流输 electrical engineering 规划, design, and tube/pipe 理. high pressure 直流输 electrical technology not only tool has high pressure 直流输 electrical technology has features, but also can will 直流输 electrical technology advantages more add separation 发挥. 直流输 electrical advantages and features main/primary has: ①输送容 amount large. in world upper already formed more electrical 3GW high pressure 直流输 electrical engineering. ②送 electrical 距离远. world upper already has 输送距离达1700km high pressure 直流输 electrical engineering. 我国 葛南（葛洲坝- Shanghai 南桥）直流输 electrical engineering 输送距离 is 1052km, 天广（天生桥-广东）, 三常（三峡-常州）, 三广（三峡-广东）, 贵广（贵州-广东） and other 直流输 electrical engineering 输送距离都接近1000km. ③输送功 rate large small and direction can fast speed control and adjustment. ④直流输 electrical 接入不会 increase has power/electricity system short electrical amount, 也不受 system stability 极限 限 made. ⑤直流输 electrical can separation utilizing 线路走廊资源, its 线路走廊 wide degree is 交流输 electrical 线路 一 semi, electrical amount large, mono 位走廊 wide degree electrical rate is 交流 4倍. 如直流±500kV线路走廊 wide degree is 30m, electrical amount 达3GW; 而交流500kV线路走廊 wide degree is 55m, electrical amount has 1GW. ⑥直流 cable 线路不受交流 cable that electrical electrical 流困扰, has magnetic loss consumption and loss consumption, basic upper has electrical retardant loss consumption, insulation water versus for relatively low. ⑥直流输 electrical engineering 一 极发生 fault/failure 时, 另一 极 can 继续运行, through negative can force, can maintain 输送功 rate or decrease/reduce 输送功 rate loss 失. ⑦直流 system 本身配 has made function, can according to system requirements reaction, for machine electrical generate retardant 尼, retardant low frequency 振荡, improve/increase power/electricity system stability water 平. ⑧ can through 换流站配置 无功功 rate control system electrical pressure adjustment. ⑨ can through 换流站配置 无功功 rate control system electrical pressure adjustment. ⑩ large electrical between through 直流输 electrical 互联（如背靠背 methods ）, 2 electrical between 不会互 versus dry and effect/influence, necessary can speed 进行功 rate 交换. high pressure 直流输 electrical features: ① pressure high, high 达±800kV. for and electrical pressure has equipment, high pressure 端（±800kV） 换流变 pressure device and its sleeve/set tube/pipe, sleeve/set tube/pipe, device and other R&D high requirements; for 承受±800kV outer insulation, 如支持瓷柱, insulation and other need new R&D. ②送 electrical amount large. 规划 特 high pressure 直流输 electrical engineering electrical amount high 达5GW and 6.4GW, versus 应 直流额定 electrical will to 3125A and 4000A. ②送 electrical long, long 达1500km, ultra- 2000km.