暂态信号分析是电力系统故障诊断和暂态保护的基础和依据，小波变换为暂态信号分析提供了强有力的数学工具。本文讨论了电力系统中常见的暂态信号分析应用，如电力暂态信号检测、去噪与数据压缩以及暂态信号定位等，对这些应用中小波基的选择原则进行了系统的分析研究。仿真分析结果进一步说明了文中提出的选择原则正确性，为小波分析在电力系统中的应用提供了有意义的参考。

Many developed countries in the world have adopted high technology to rebuild and improve the rail transportation industry actively. It has increased the security and automation degree of rail transportation greatly. Since "the ninth five-year-plan", the velocity and quality of rail transportation infrastructure construction are improved quickly by applying high technology in China. However, there still have much difference between china and the developed countries in the development of rail transportation. This paper systematically researches the application of high technology in rail transportation such as railway, metro, light railway, railway nearby suburb, maglev railway etc. and also researches the development road to high technology industrialization in transportation field, on the basis of viewing the current development condition and the trend of rail transportation in the world and analyzing the development status and trend of rail transportation in our country.

The front technologies: Linear motor drive technology, unmanned driving technology, and MCS technology, are all advanced technologies of rail transit fields in the world at present. These technologies are applied in some systems such as the subway, the urban light railway, the suburban railway, the high-speed passenger transportation and the heavy freight, which will improve automatic level and bring much more economic utility into rail transit system. So the concepts of those front technologies are introduced, and the work principles are discussed. The purpose is to strengthening people's knowledge of these new technologies and promoting the development of urban rail transit in our country.

This paper discusses the intelligent multi-agent technology, and proposes an intelligent multi-agent based Accurate fault location detection and fault diagnosis system applied in 10kv automatic blocking and continuous power transmission lines along the railway, Agents are software processes capable of searching for information in the networks, interacting with pieces of equipment and performing tasks on behalf of their owner(device). Moreover, they are autonomous and cooperative. Intelligent agents also have the capability to learn as the power supply network topology or environment changed. The system architecture is proposed, the features of each agents are described. Analysis brings forth the merits of this fault location and diagnosis system.