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Prevention Theory of DC Traction System Frame in Subway and Spot Emergency Treatment 地铁直流牵引系统框架保护原理及现场应急处置
DC traction system 直流牵引
DC traction power supply system for rail transit 直流牵引供电系统
Abstract： The urban mass transit usually adopts DC traction power supply system.The max traction current and its durative time alter with the number of trains in running rail. 摘要：城市轨道交通一般采用直流牵引供电系统，走行轨上最大牵引电流及其持续时间会随着供电区间内牵引列车数的不同而异。
Through the analysis of adhesion characteristics of the locomotive traction system, the simplified simulation model is built. 通过分析机车牵引系统的粘着特性，建立了简化的机车牵引系统仿真模型；
The behavior principle of DDL protection for DC feeder in DC traction current supply system and the setting principle of protection parameters are introduced and illustrative examples are given. 摘要介绍直流牵引供电系统中直流馈线DDL保护的动作原理，以及保护参数的设定原则，并举例说明。
The trial operation of the vehicle lasting more than one year indicates the advantages of the electronic control unit and excellent performance of the traction system. 该车辆在上海莘闵线投入试运营1年多,充分展示了其电子控制单元的先进性和牵引系统的性能优势。
Based on the graph of the reactance-distance, the scheme of reactance-distance can be used in fault location of direct power traction system with full parallel connection. 根据阻抗表达式绘出电抗距离曲线图，证明全并联直接供电牵引网短路时，故障点仍然可以采用电抗查表法进行定位。
In addition, the minimal comfiguration of the traction system was least could be obtained by using this criterion and the above mentioned function relation. 同时，利用该判别式和曳引配置各部件与防滑判据的函数关系，实现了曳引系统各部件的配置为最小的目的。
Rail Potential and Stray Current of DC Traction Power System 直流牵引供电系统钢轨电位与杂散电流分析
DDL Protection in Subway DC Traction Power Supply System 地铁直流牵引供电系统中的DDL保护
By discussing control principle of the TCU(Traction Control Unit) and the dynamic characters of the traction system of the metro vehicle,a real-time testing platform for the TCU was proposed based on the xPC Target toolbox of Matlab. 在讨论地铁牵引系统动态特性和控制原理的基础上,应用MATLAB的xPC Target工具箱,构建了针对牵引控制单元(TCU)的实时仿真测试平台。
high voltage DC traction power grid 高压直流牵引网
PROTECTION METHOD OF FEEDER LINE IN SUBWAY DC TRACTION SUPPLY SYSTEM 地铁直流牵引供电系统馈线的保护方法
Analysis of Stray Current in Metro DC Traction power System 地铁直流牵引供电系统杂散电流分析
In this paper a vector controlled AC speed-regulating system is developed,which adopts the rotor flux field-orientated theory to meet the requirements for an electric traction system. 本文依据矢量控制的基本原理,针对电力牵引系统对电机控制性能的要求,设计了基于转子磁场定向的矢量控制交流调速系统。
The advanced permanent magnet synchronous gear-less traction system results in the energy-saving lift operation.It is of the environmental protection, non-maintenance and long life. 先进的永磁同步无齿轮曳引系统，使电梯运行节能、环保、免维护、寿命长。
I suppose you also have a caste system in your society. 我想你们的社会里也有一种等级制度。
The right to dissent is part of our political system. 有持异议的权利是我们政治体制的组成部分。
Research on Protection Method of Feeder Line in Subway DC Traction Supply System 地铁直流牵引供电系统馈线保护方法研究