Aircraft Ac Power Systems (control And Protection)

Along with development of the Chinese commercial aviation, domestic enterprises already have 863 airplanes now, According to Boeing Company's forecast, China's airline will have more than 2200 airplanes by 2020.That means China will become the second big civil aviation market, only after U.S. On the other hand Chinese Aviation manufacture have no independent technology of big airplane. Boeing occupies 62% share of the Chinese commercial aviation market , A total expense to purchase aieplane from American Boeing has accumulated to 40 billion dollars. Only in 2005, China airlines have ordered 442 airplanes from Boeing and Airbus. the list price is as high as about 200 billion Yuan. On the contrary,the profit of domestic airlines in total is only 1650 million Yuan, Which is not enough to buy one airplane such as A380. Therefore, It is necessary for china to develop its own aircraft industry for large airplanet.The State Council has approved "the National Medium and long-term Science And Technological development Plan (2006-2020 Year)". In the plan the development of large plane is listed as one of the most 16 important project.By taking the power system ok Boeing aieplanes as the subject of study ,the paper analyzed the function of the system ,the related modules ,and their detailed opration and circuits, although the availability of the reference materials is very diffcult.I hope the results of the paper can contribute to the development of the project of the national large airplane.