NES6100 excitation system developed by State Power NARI recently put into operation at Tianwan Nuclear Power Station in Lianyungang. This is also the first time the domestic excitation system is applied to nuclear power units, breaking the monopoly of imported products. The first phase of the Tianwan Nuclear Power Station in Gao Gongdao, Lianyungang is being constructed with 2 sets of Russian AES-91 PWR nuclear power generating units with a capacity of 1,060,000 kilowatts. They are put into operation on May 17 and August 16, 2007 respectively. Tianwan Nuclear Power Station Unit 2 excitation system used to support the Russian mainframe excitation, has been running for nearly 8 years, the use of Unit 2 overhaul the excitation system for a full set of replacement, and the State Power NARI developed domestic excitation system. State Power NARI has been engaged in the research and production of generator excitation equipment for more than 30 years. Excitation products constantly break the foreign monopoly in all fields of power generation such as conventional hydropower, conventional thermal power, gas turbine, pumped storage, biomass power generation, wind power generation and nuclear energy. NARI designed multiple redundant configurations and fault-tolerant protection functions for the characteristics of nuclear excitation, and developed a brushless rotating unit detection device to meet the higher requirements of the excitation system of nuclear power generation units. Guangzhou YS Auto Parts Co.,LTD , https://www.ysapcn.com