日前,中国西电研制成功国内首台高性能220 k V 70 MVA串联变压器,这台高新技术产品,是中国西电为南京220 k V西环网统一潮流控制器工程设计制造的关键设备。
当前电网普遍存在潮流分布不合理、运行欠灵活等问题,影响电网输电能力,迫切...日前,中国西电研制成功国内首台高性能220 k V 70 MVA串联变压器,这台高新技术产品,是中国西电为南京220 k V西环网统一潮流控制器工程设计制造的关键设备。
当前电网普遍存在潮流分布不合理、运行欠灵活等问题,影响电网输电能力,迫切需要一种新的技术手段对系统电压和潮流进行灵活动态的调节,提高电网驾驭能力。统一潮流控制器（UPFC）能够有效的解决这一系列问题,串联变压器就是统一潮流控制器UPFC工程中,必不可少的重要设备,市场前景十分广阔。展开更多
2015年7月13日,由中国西电集团公司研制的灵绍工程首台±800 k V、400 Mvar干式平波电抗器一次性通过全部试验,各项性能指标满足了国家标准和技术协议的要求。这标志着灵绍工程首台±800 k V干式平波电抗器在中国西电研制成功...2015年7月13日,由中国西电集团公司研制的灵绍工程首台±800 k V、400 Mvar干式平波电抗器一次性通过全部试验,各项性能指标满足了国家标准和技术协议的要求。这标志着灵绍工程首台±800 k V干式平波电抗器在中国西电研制成功。干式平波电抗器因其无油、环保,没有辅助运行系统,基本免维护等优势,正在逐渐成为直流输电网络发展的一个方向。展开更多
A novel metasurface antenna consisting of 5×5 rectangular patch elements is presented.Thestructure with and without the central element are both analyzed by the Characteristic Mode Theory(CMT).The developed mutua...A novel metasurface antenna consisting of 5×5 rectangular patch elements is presented.Thestructure with and without the central element are both analyzed by the Characteristic Mode Theory(CMT).The developed mutually orthogonal principal modes of the optimized periodic patch structure areexcited by a center-feed dipole.A differential feeding network is employed to realize impedance matching.Prototype with profile height of 0.07λ_(0)(λ_(0)is the wavelength in free space at the lowest operatingfrequency)is fabricated and assembled to verify the simulation results.The measured results show that thereflectance coefficient of proposed matesurface antenna is less than-10 dB in the whole operating bandrange from 4.2 GHz to 5.5 GHz,a relative bandwidth of 26.8%is achieved,and the maximummeasured realized gain is more than 9 dBi with a maximum radiation efficiency of 90%.The designprovides a guideline on the application of characteristic modes(CMs)to radiation problems.展开更多
文摘日前,中国西电研制成功国内首台高性能220 k V 70 MVA串联变压器,这台高新技术产品,是中国西电为南京220 k V西环网统一潮流控制器工程设计制造的关键设备。
当前电网普遍存在潮流分布不合理、运行欠灵活等问题,影响电网输电能力,迫切需要一种新的技术手段对系统电压和潮流进行灵活动态的调节,提高电网驾驭能力。统一潮流控制器（UPFC）能够有效的解决这一系列问题,串联变压器就是统一潮流控制器UPFC工程中,必不可少的重要设备,市场前景十分广阔。
文摘2015年7月13日,由中国西电集团公司研制的灵绍工程首台±800 k V、400 Mvar干式平波电抗器一次性通过全部试验,各项性能指标满足了国家标准和技术协议的要求。这标志着灵绍工程首台±800 k V干式平波电抗器在中国西电研制成功。干式平波电抗器因其无油、环保,没有辅助运行系统,基本免维护等优势,正在逐渐成为直流输电网络发展的一个方向。
文摘A novel metasurface antenna consisting of 5×5 rectangular patch elements is presented.Thestructure with and without the central element are both analyzed by the Characteristic Mode Theory(CMT).The developed mutually orthogonal principal modes of the optimized periodic patch structure areexcited by a center-feed dipole.A differential feeding network is employed to realize impedance matching.Prototype with profile height of 0.07λ_(0)(λ_(0)is the wavelength in free space at the lowest operatingfrequency)is fabricated and assembled to verify the simulation results.The measured results show that thereflectance coefficient of proposed matesurface antenna is less than-10 dB in the whole operating bandrange from 4.2 GHz to 5.5 GHz,a relative bandwidth of 26.8%is achieved,and the maximummeasured realized gain is more than 9 dBi with a maximum radiation efficiency of 90%.The designprovides a guideline on the application of characteristic modes(CMs)to radiation problems.
