High-speed rail is a collection of all the most advanced railway technology, advanced operation management, marketing and financing, including a very complex system engineering, high efficiency operation system, which includes infrastructure, rolling stock configuration , station car operating rules and other aspects of technology and management. With its speed, large transport capacity, low energy consumption, light pollution, small footprint and good safety performance and a series of outstanding technical and economic advantages, attracted world attention. Germany, Britain, Italy, Spain and other countries competing for the development, there are many countries and regions are actively preparing. The EU has plans completed by 2010 29000km pan-European high-speed rail network, Japan also plans to build 6900km Shinkansen. China's vast territory, large population, the development of transport, high-speed rail is undoubtedly the first choice. However, the faster you are, the greater the power required, the best way to improve is to increase the power transmission line voltage level, China's high-speed rail voltage level used for the 27.5kV, but the locomotives used on the high-voltage cable partial discharge detection has been a blank, high-speed locomotives currently in operation is one of the biggest security risks.