The paper introduces current situation and features of railway communication system power supply and advantages of the storage battery pile.

介绍了铁路通信电源系统的现状及铁路通信电源系统的特点、蓄电池组的优点。

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GTO over current rapid protection by gradation mode and limited protection conditions are studied based on the features of GTO and over current situation under fault state.

基于GTO器件特性和故障状态下gto的过流工况，研究了GTO过流分级快速保护模式和实现方法以及保护的极限条件。

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This paper probes into the definitions and features of users' information demand, and expounds the current research situation of the information demands of the traditional users and the network users.

探讨了用户信息需求的定义与特点，阐述了传统用户信息需求和网络用户信息需求的研究现状。

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